refactor: linters + recommendations applied, closes #146

Makefile

@@ -57,6 +57,57 @@ generate:
 	build/env.sh go generate ./static
 	rm ./static/scripts/web3.js
 
+lint-deps:
+	go get -u github.com/alecthomas/gometalinter
+	gometalinter --install
+
+lint-cur:
+	gometalinter --disable-all --enable=deadcode extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+
+lint:
+	@echo "Linter: go vet\n--------------------"
+	@gometalinter --disable-all --enable=vet extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: go vet --shadow\n--------------------"
+	@gometalinter --disable-all --enable=vetshadow extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: gofmt\n--------------------"
+	@gometalinter --disable-all --enable=gofmt extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: goimports\n--------------------"
+	@gometalinter --disable-all --enable=goimports extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: golint\n--------------------"
+	@gometalinter --disable-all --enable=golint extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: deadcode\n--------------------"
+	@gometalinter --disable-all --enable=deadcode extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: misspell\n--------------------"
+	@gometalinter --disable-all --enable=misspell extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: unparam\n--------------------"
+	@gometalinter --disable-all --deadline 45s --enable=unparam extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: unused\n--------------------"
+	@gometalinter --disable-all --deadline 45s --enable=unused extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: gocyclo\n--------------------"
+	@gometalinter --disable-all --enable=gocyclo extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: errcheck\n--------------------"
+	@gometalinter --disable-all --enable=errcheck extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: dupl\n--------------------"
+	@gometalinter --disable-all --enable=dupl extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: ineffassign\n--------------------"
+	@gometalinter --disable-all --enable=ineffassign extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: interfacer\n--------------------"
+	@gometalinter --disable-all --enable=interfacer extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: unconvert\n--------------------"
+	@gometalinter --disable-all --enable=unconvert extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: goconst\n--------------------"
+	@gometalinter --disable-all --enable=goconst extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: staticcheck\n--------------------"
+	@gometalinter --disable-all --deadline 45s --enable=staticcheck extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: gas\n--------------------"
+	@gometalinter --disable-all --enable=gas extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: varcheck\n--------------------"
+	@gometalinter --disable-all --deadline 60s --enable=varcheck extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: structcheck\n--------------------"
+	@gometalinter --disable-all --enable=structcheck extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+	@echo "Linter: gosimple\n--------------------"
+	@gometalinter --disable-all --deadline 45s --enable=gosimple extkeys cmd/... geth/... | grep -v -f ./static/config/linter_exclude_list.txt || echo "OK!"
+
 test:
 	@build/env.sh echo "mode: set" > coverage-all.out
 	build/env.sh go test -coverprofile=coverage.out -covermode=set ./geth

cmd/statusd/library.go

@@ -128,7 +128,7 @@ func CompleteTransaction(id, password *C.char) *C.char {
 	}
 
 	out := geth.CompleteTransactionResult{
-		Id:    C.GoString(id),
+		ID:    C.GoString(id),
 		Hash:  txHash.Hex(),
 		Error: errString,
 	}
@@ -143,15 +143,15 @@ func CompleteTransactions(ids, password *C.char) *C.char {
 	out.Results = make(map[string]geth.CompleteTransactionResult)
 
 	results := geth.CompleteTransactions(C.GoString(ids), C.GoString(password))
-	for txId, result := range results {
+	for txID, result := range results {
 		txResult := geth.CompleteTransactionResult{
-			Id:   txId,
+			ID:   txID,
 			Hash: result.Hash.Hex(),
 		}
 		if result.Error != nil {
 			txResult.Error = result.Error.Error()
 		}
-		out.Results[txId] = txResult
+		out.Results[txID] = txResult
 	}
 	outBytes, _ := json.Marshal(&out)
 
@@ -169,7 +169,7 @@ func DiscardTransaction(id *C.char) *C.char {
 	}
 
 	out := geth.DiscardTransactionResult{
-		Id:    C.GoString(id),
+		ID:    C.GoString(id),
 		Error: errString,
 	}
 	outBytes, _ := json.Marshal(&out)
@@ -183,14 +183,14 @@ func DiscardTransactions(ids *C.char) *C.char {
 	out.Results = make(map[string]geth.DiscardTransactionResult)
 
 	results := geth.DiscardTransactions(C.GoString(ids))
-	for txId, result := range results {
+	for txID, result := range results {
 		txResult := geth.DiscardTransactionResult{
-			Id: txId,
+			ID: txID,
 		}
 		if result.Error != nil {
 			txResult.Error = result.Error.Error()
 		}
-		out.Results[txId] = txResult
+		out.Results[txID] = txResult
 	}
 	outBytes, _ := json.Marshal(&out)
 
@@ -198,8 +198,8 @@ func DiscardTransactions(ids *C.char) *C.char {
 }
 
 //export GenerateConfig
-func GenerateConfig(datadir *C.char, networkId C.int) *C.char {
+func GenerateConfig(datadir *C.char, networkID C.int) *C.char {
-	config, err := params.NewNodeConfig(C.GoString(datadir), uint64(networkId))
+	config, err := params.NewNodeConfig(C.GoString(datadir), uint64(networkID))
 	if err != nil {
 		return makeJSONErrorResponse(err)
 	}
@@ -261,14 +261,14 @@ func InitJail(js *C.char) {
 }
 
 //export Parse
-func Parse(chatId *C.char, js *C.char) *C.char {
+func Parse(chatID *C.char, js *C.char) *C.char {
-	res := jail.GetInstance().Parse(C.GoString(chatId), C.GoString(js))
+	res := jail.GetInstance().Parse(C.GoString(chatID), C.GoString(js))
 	return C.CString(res)
 }
 
 //export Call
-func Call(chatId *C.char, path *C.char, params *C.char) *C.char {
+func Call(chatID *C.char, path *C.char, params *C.char) *C.char {
-	res := jail.GetInstance().Call(C.GoString(chatId), C.GoString(path), C.GoString(params))
+	res := jail.GetInstance().Call(C.GoString(chatID), C.GoString(path), C.GoString(params))
 	return C.CString(res)
 }
 

cmd/statusd/main.go

@@ -18,45 +18,64 @@ var (
 )
 
 var (
+	// NodeKeyFileFlag is a node key file to be used as node's private key
 	NodeKeyFileFlag = cli.StringFlag{
 		Name:  "nodekey",
 		Usage: "P2P node key file (private key)",
 	}
+
+	// DataDirFlag defines data directory for the node
 	DataDirFlag = cli.StringFlag{
 		Name:  "datadir",
 		Usage: "Data directory for the databases and keystore",
 		Value: params.DataDir,
 	}
-	NetworkIdFlag = cli.IntFlag{
+
+	// NetworkIDFlag defines network ID
+	NetworkIDFlag = cli.IntFlag{
 		Name:  "networkid",
 		Usage: "Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten)",
-		Value: params.TestNetworkId,
+		Value: params.TestNetworkID,
 	}
+
+	// LightEthEnabledFlag flags whether LES is enabled or not
 	LightEthEnabledFlag = cli.BoolFlag{
 		Name:  "les",
 		Usage: "LES protocol enabled",
 	}
+
+	// WhisperEnabledFlag flags whether Whisper is enabled or not
 	WhisperEnabledFlag = cli.BoolFlag{
 		Name:  "shh",
 		Usage: "SHH protocol enabled",
 	}
+
+	// SwarmEnabledFlag flags whether Swarm is enabled or not
 	SwarmEnabledFlag = cli.BoolFlag{
 		Name:  "swarm",
 		Usage: "Swarm protocol enabled",
 	}
+
+	// HTTPEnabledFlag defines whether HTTP RPC endpoint should be opened or not
 	HTTPEnabledFlag = cli.BoolFlag{
 		Name:  "http",
 		Usage: "HTTP RPC enpoint enabled",
 	}
+
+	// HTTPPortFlag defines HTTP RPC port to use (if HTTP RPC is enabled)
 	HTTPPortFlag = cli.IntFlag{
 		Name:  "httpport",
 		Usage: "HTTP RPC server's listening port",
 		Value: params.HTTPPort,
 	}
+
+	// IPCEnabledFlag flags whether IPC is enabled or not
 	IPCEnabledFlag = cli.BoolFlag{
 		Name:  "ipc",
 		Usage: "IPC RPC enpoint enabled",
 	}
+
+	// LogLevelFlag defines a log reporting level
 	LogLevelFlag = cli.StringFlag{
 		Name:  "log",
 		Usage: `Log level, one of: ""ERROR", "WARNING", "INFO", "DEBUG", and "TRACE"`,
@@ -76,7 +95,7 @@ func init() {
 	app.Flags = []cli.Flag{
 		NodeKeyFileFlag,
 		DataDirFlag,
-		NetworkIdFlag,
+		NetworkIDFlag,
 		LightEthEnabledFlag,
 		WhisperEnabledFlag,
 		SwarmEnabledFlag,
@@ -121,7 +140,7 @@ func statusd(ctx *cli.Context) error {
 
 // makeNodeConfig parses incoming CLI options and returns node configuration object
 func makeNodeConfig(ctx *cli.Context) (*params.NodeConfig, error) {
-	nodeConfig, err := params.NewNodeConfig(ctx.GlobalString(DataDirFlag.Name), ctx.GlobalUint64(NetworkIdFlag.Name))
+	nodeConfig, err := params.NewNodeConfig(ctx.GlobalString(DataDirFlag.Name), ctx.GlobalUint64(NetworkIDFlag.Name))
 	if err != nil {
 		return nil, err
 	}

cmd/statusd/misccmd.go

@@ -25,8 +25,11 @@ func version(ctx *cli.Context) error {
 	if gitCommit != "" {
 		fmt.Println("Git Commit:", gitCommit)
 	}
+	if buildStamp != "" {
+		fmt.Println("Build Stamp:", buildStamp)
+	}
 
-	fmt.Println("Network Id:", ctx.GlobalInt(NetworkIdFlag.Name))
+	fmt.Println("Network Id:", ctx.GlobalInt(NetworkIDFlag.Name))
 	fmt.Println("Go Version:", runtime.Version())
 	fmt.Println("OS:", runtime.GOOS)
 	fmt.Printf("GOPATH=%s\n", os.Getenv("GOPATH"))

cmd/statusd/utils.go

@@ -20,6 +20,8 @@ import (
 	"github.com/status-im/status-go/geth/params"
 )
 
+const zeroHash = "0x0000000000000000000000000000000000000000000000000000000000000000"
+
 var testConfig *geth.TestConfig
 
 func init() {
@@ -28,6 +30,7 @@ func init() {
 	testConfig, _ = geth.LoadTestConfig()
 }
 
+// nolint: deadcode
 func testExportedAPI(t *testing.T, done chan struct{}) {
 	<-startTestNode(t)
 
@@ -108,7 +111,7 @@ func testGetDefaultConfig(t *testing.T) bool {
 
 	rawResponse := GenerateConfig(C.CString("/tmp/data-folder"), 1)
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &nodeConfig); err != nil {
-		t.Errorf("cannot decode reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -155,7 +158,7 @@ func testGetDefaultConfig(t *testing.T) bool {
 	nodeConfig = params.NodeConfig{}
 	rawResponse = GenerateConfig(C.CString("/tmp/data-folder"), 3)
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &nodeConfig); err != nil {
-		t.Errorf("cannot decode reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -208,7 +211,7 @@ func testResetChainData(t *testing.T) bool {
 	rawResponse := ResetChainData()
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &resetChainDataResponse); err != nil {
-		t.Errorf("cannot decode ResetChainData reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode ResetChainData response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 	if resetChainDataResponse.Error != "" {
@@ -224,7 +227,10 @@ func testResetChainData(t *testing.T) bool {
 }
 
 func testStopResumeNode(t *testing.T) bool {
-	geth.Logout() // to make sure that we start with empty account (which might get populated during previous tests)
+	// to make sure that we start with empty account (which might get populated during previous tests)
+	if err := geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	whisperService, err := geth.NodeManagerInstance().WhisperService()
 	if err != nil {
@@ -248,8 +254,8 @@ func testStopResumeNode(t *testing.T) bool {
 	loginResponse := geth.JSONError{}
 	rawResponse := Login(C.CString(address1), C.CString(testConfig.Account1.Password))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -262,12 +268,13 @@ func testStopResumeNode(t *testing.T) bool {
 	}
 
 	// stop and resume node, then make sure that selected account is still selected
+	// nolint: dupl
 	stopNodeFn := func() bool {
 		response := geth.JSONError{}
 		rawResponse = StopNode()
 
-		if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &response); err != nil {
+		if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &response); err != nil {
-			t.Errorf("cannot decode StopNode reponse (%s): %v", C.GoString(rawResponse), err)
+			t.Errorf("cannot decode StopNode response (%s): %v", C.GoString(rawResponse), err)
 			return false
 		}
 		if response.Error != "" {
@@ -278,12 +285,13 @@ func testStopResumeNode(t *testing.T) bool {
 		return true
 	}
 
+	// nolint: dupl
 	resumeNodeFn := func() bool {
 		response := geth.JSONError{}
 		rawResponse = ResumeNode()
 
-		if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &response); err != nil {
+		if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &response); err != nil {
-			t.Errorf("cannot decode ResumeNode reponse (%s): %v", C.GoString(rawResponse), err)
+			t.Errorf("cannot decode ResumeNode response (%s): %v", C.GoString(rawResponse), err)
 			return false
 		}
 		if response.Error != "" {
@@ -322,7 +330,7 @@ func testRestartNodeRPC(t *testing.T) bool {
 	rawResponse := StopNodeRPCServer()
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &stopNodeRPCServerResponse); err != nil {
-		t.Errorf("cannot decode StopNodeRPCServer reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode StopNodeRPCServer response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 	if stopNodeRPCServerResponse.Error != "" {
@@ -335,7 +343,7 @@ func testRestartNodeRPC(t *testing.T) bool {
 	rawResponse = StartNodeRPCServer()
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &startNodeRPCServerResponse); err != nil {
-		t.Errorf("cannot decode StartNodeRPCServer reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode StartNodeRPCServer response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 	if startNodeRPCServerResponse.Error != "" {
@@ -348,7 +356,7 @@ func testRestartNodeRPC(t *testing.T) bool {
 	rawResponse = StartNodeRPCServer()
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &startNodeRPCServerResponse); err != nil {
-		t.Errorf("cannot decode StartNodeRPCServer reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode StartNodeRPCServer response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 	expectedError := "HTTP RPC already running on localhost:8645"
@@ -361,7 +369,10 @@ func testRestartNodeRPC(t *testing.T) bool {
 }
 
 func testCreateChildAccount(t *testing.T) bool {
-	geth.Logout() // to make sure that we start with empty account (which might get populated during previous tests)
+	// to make sure that we start with empty account (which might get populated during previous tests)
+	if err := geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	keyStore, err := geth.NodeManagerInstance().AccountKeyStore()
 	if err != nil {
@@ -373,8 +384,8 @@ func testCreateChildAccount(t *testing.T) bool {
 	createAccountResponse := geth.AccountInfo{}
 	rawResponse := CreateAccount(C.CString(testConfig.Account1.Password))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createAccountResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &createAccountResponse); err != nil {
-		t.Errorf("cannot decode CreateAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -392,7 +403,7 @@ func testCreateChildAccount(t *testing.T) bool {
 	}
 
 	// obtain decrypted key, and make sure that extended key (which will be used as root for sub-accounts) is present
-	account, key, err := keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
+	_, key, err := keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
 	if err != nil {
 		t.Errorf("can not obtain decrypted account key: %v", err)
 		return false
@@ -407,8 +418,8 @@ func testCreateChildAccount(t *testing.T) bool {
 	createSubAccountResponse := geth.AccountInfo{}
 	rawResponse = CreateChildAccount(C.CString(""), C.CString(testConfig.Account1.Password))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse); err != nil {
-		t.Errorf("cannot decode CreateChildAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateChildAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -428,11 +439,11 @@ func testCreateChildAccount(t *testing.T) bool {
 	rawResponse = CreateChildAccount(C.CString(""), C.CString("wrong password"))
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse); err != nil {
-		t.Errorf("cannot decode CreateChildAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateChildAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
-	if createSubAccountResponse.Error != "cannot retreive a valid key for a given account: could not decrypt key with given passphrase" {
+	if createSubAccountResponse.Error != "cannot retrieve a valid key for a given account: could not decrypt key with given passphrase" {
 		t.Errorf("expected error is not returned (tried to create sub-account with wrong password): %v", createSubAccountResponse.Error)
 		return false
 	}
@@ -442,7 +453,7 @@ func testCreateChildAccount(t *testing.T) bool {
 	rawResponse = CreateChildAccount(C.CString(""), C.CString(testConfig.Account1.Password))
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse1); err != nil {
-		t.Errorf("cannot decode CreateChildAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateChildAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -456,7 +467,7 @@ func testCreateChildAccount(t *testing.T) bool {
 	rawResponse = CreateChildAccount(C.CString(""), C.CString(testConfig.Account1.Password))
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse2); err != nil {
-		t.Errorf("cannot decode CreateChildAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateChildAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -474,7 +485,7 @@ func testCreateChildAccount(t *testing.T) bool {
 	rawResponse = CreateChildAccount(C.CString(createSubAccountResponse2.Address), C.CString(testConfig.Account1.Password))
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &createSubAccountResponse3); err != nil {
-		t.Errorf("cannot decode CreateChildAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode CreateChildAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -508,8 +519,8 @@ func testRecoverAccount(t *testing.T) bool {
 	recoverAccountResponse := geth.AccountInfo{}
 	rawResponse := RecoverAccount(C.CString(testConfig.Account1.Password), C.CString(mnemonic))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -535,15 +546,15 @@ func testRecoverAccount(t *testing.T) bool {
 	}
 	extChild2String := key.ExtendedKey.String()
 
-	if err := keyStore.Delete(account, testConfig.Account1.Password); err != nil {
+	if err = keyStore.Delete(account, testConfig.Account1.Password); err != nil {
 		t.Errorf("cannot remove account: %v", err)
 	}
 
 	recoverAccountResponse = geth.AccountInfo{}
 	rawResponse = RecoverAccount(C.CString(testConfig.Account1.Password), C.CString(mnemonic))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -557,7 +568,7 @@ func testRecoverAccount(t *testing.T) bool {
 	}
 
 	// make sure that extended key exists and is imported ok too
-	account, key, err = keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
+	_, key, err = keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
 	if err != nil {
 		t.Errorf("can not obtain decrypted account key: %v", err)
 		return false
@@ -570,8 +581,8 @@ func testRecoverAccount(t *testing.T) bool {
 	recoverAccountResponse = geth.AccountInfo{}
 	rawResponse = RecoverAccount(C.CString(testConfig.Account1.Password), C.CString(mnemonic))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &recoverAccountResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -637,8 +648,8 @@ func testAccountSelect(t *testing.T) bool {
 	loginResponse := geth.JSONError{}
 	rawResponse := Login(C.CString(address1), C.CString("wrongPassword"))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -650,8 +661,8 @@ func testAccountSelect(t *testing.T) bool {
 	loginResponse = geth.JSONError{}
 	rawResponse = Login(C.CString(address1), C.CString(testConfig.Account1.Password))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -671,8 +682,8 @@ func testAccountSelect(t *testing.T) bool {
 	loginResponse = geth.JSONError{}
 	rawResponse = Login(C.CString(address2), C.CString(testConfig.Account1.Password))
 
-	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
+	if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &loginResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -725,7 +736,7 @@ func testAccountLogout(t *testing.T) bool {
 	rawResponse := Logout()
 
 	if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &logoutResponse); err != nil {
-		t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+		t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 		return false
 	}
 
@@ -756,7 +767,7 @@ func testCompleteTransaction(t *testing.T) bool {
 	backend.TransactionQueue().Reset()
 
 	// log into account from which transactions will be sent
-	if err := geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
+	if err = geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
 		t.Errorf("cannot select account: %v", testConfig.Account1.Address)
 		return false
 	}
@@ -770,7 +781,7 @@ func testCompleteTransaction(t *testing.T) bool {
 	var txHash = ""
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
 		var envelope geth.SignalEnvelope
-		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
+		if err = json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
 			return
 		}
@@ -781,12 +792,12 @@ func testCompleteTransaction(t *testing.T) bool {
 			completeTxResponse := geth.CompleteTransactionResult{}
 			rawResponse := CompleteTransaction(C.CString(event["id"].(string)), C.CString(testConfig.Account1.Password))
 
-			if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &completeTxResponse); err != nil {
+			if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &completeTxResponse); err != nil {
-				t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+				t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 			}
 
 			if completeTxResponse.Error != "" {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], completeTxResponse.Error)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], completeTxResponse.Error)
 			}
 
 			txHash = completeTxResponse.Hash
@@ -847,12 +858,12 @@ func testCompleteMultipleQueuedTransactions(t *testing.T) bool {
 
 	// make sure you panic if transaction complete doesn't return
 	testTxCount := 3
-	txIds := make(chan string, testTxCount)
+	txIDs := make(chan string, testTxCount)
 	allTestTxCompleted := make(chan struct{}, 1)
 
 	// replace transaction notification handler
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
-		var txId string
+		var txID string
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -860,10 +871,10 @@ func testCompleteMultipleQueuedTransactions(t *testing.T) bool {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be completed in a single call, once aggregated): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be completed in a single call, once aggregated): {id: %s}\n", txID)
 
-			txIds <- txId
+			txIDs <- txID
 		}
 	})
 
@@ -886,58 +897,64 @@ func testCompleteMultipleQueuedTransactions(t *testing.T) bool {
 	}
 
 	// wait for transactions, and complete them in a single call
-	completeTxs := func(txIdStrings string) {
+	completeTxs := func(txIDStrings string) {
-		var parsedIds []string
+		var parsedIDs []string
-		json.Unmarshal([]byte(txIdStrings), &parsedIds)
+		if err := json.Unmarshal([]byte(txIDStrings), &parsedIDs); err != nil {
+			t.Error(err)
+			return
+		}
 
-		parsedIds = append(parsedIds, "invalid-tx-id")
+		parsedIDs = append(parsedIDs, "invalid-tx-id")
-		updatedTxIdStrings, _ := json.Marshal(parsedIds)
+		updatedTxIDStrings, _ := json.Marshal(parsedIDs)
 
 		// complete
-		resultsString := CompleteTransactions(C.CString(string(updatedTxIdStrings)), C.CString(testConfig.Account1.Password))
+		resultsString := CompleteTransactions(C.CString(string(updatedTxIDStrings)), C.CString(testConfig.Account1.Password))
 		resultsStruct := geth.CompleteTransactionsResult{}
-		json.Unmarshal([]byte(C.GoString(resultsString)), &resultsStruct)
+		if err := json.Unmarshal([]byte(C.GoString(resultsString)), &resultsStruct); err != nil {
+			t.Error(err)
+			return
+		}
 		results := resultsStruct.Results
 
-		if len(results) != (testTxCount+1) || results["invalid-tx-id"].Error != "transaction hash not found" {
+		if len(results) != (testTxCount+1) || results["invalid-tx-id"].Error != status.ErrQueuedTxIDNotFound.Error() {
 			t.Errorf("cannot complete txs: %v", results)
 			return
 		}
-		for txId, txResult := range results {
+		for txID, txResult := range results {
-			if txId != txResult.Id {
+			if txID != txResult.ID {
-				t.Errorf("tx id not set in result: expected id is %s", txId)
+				t.Errorf("tx id not set in result: expected id is %s", txID)
 				return
 			}
-			if txResult.Error != "" && txId != "invalid-tx-id" {
+			if txResult.Error != "" && txID != "invalid-tx-id" {
-				t.Errorf("invalid error for %s", txId)
+				t.Errorf("invalid error for %s", txID)
 				return
 			}
-			if txResult.Hash == "0x0000000000000000000000000000000000000000000000000000000000000000" && txId != "invalid-tx-id" {
+			if txResult.Hash == zeroHash && txID != "invalid-tx-id" {
-				t.Errorf("invalid hash (expected non empty hash): %s", txId)
+				t.Errorf("invalid hash (expected non empty hash): %s", txID)
 				return
 			}
 
-			if txResult.Hash != "0x0000000000000000000000000000000000000000000000000000000000000000" {
+			if txResult.Hash != zeroHash {
 				t.Logf("transaction complete: https://testnet.etherscan.io/tx/%s", txResult.Hash)
 			}
 		}
 
 		time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-		for _, txId := range parsedIds {
+		for _, txID := range parsedIDs {
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be completed): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be completed): %s", txID)
 				return
 			}
 		}
 	}
 	go func() {
-		var txIdStrings []string
+		var txIDStrings []string
 		for i := 0; i < testTxCount; i++ {
-			txIdStrings = append(txIdStrings, <-txIds)
+			txIDStrings = append(txIDStrings, <-txIDs)
 		}
 
-		txIdJSON, _ := json.Marshal(txIdStrings)
+		txIDJSON, _ := json.Marshal(txIDStrings)
-		completeTxs(string(txIdJSON))
+		completeTxs(string(txIDJSON))
 		allTestTxCompleted <- struct{}{}
 	}()
 
@@ -975,7 +992,7 @@ func testDiscardTransaction(t *testing.T) bool {
 	backend.TransactionQueue().Reset()
 
 	// log into account from which transactions will be sent
-	if err := geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
+	if err = geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
 		t.Errorf("cannot select account: %v", testConfig.Account1.Address)
 		return false
 	}
@@ -985,30 +1002,30 @@ func testDiscardTransaction(t *testing.T) bool {
 	geth.PanicAfter(20*time.Second, completeQueuedTransaction, "TestDiscardQueuedTransactions")
 
 	// replace transaction notification handler
-	var txId string
+	var txID string
 	txFailedEventCalled := false
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
 		var envelope geth.SignalEnvelope
-		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
+		if err = json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
 			return
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txID)
 
-			if !backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if !backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should still have test tx: %s", txId)
+				t.Errorf("txqueue should still have test tx: %s", txID)
 				return
 			}
 
 			// discard
 			discardResponse := geth.DiscardTransactionResult{}
-			rawResponse := DiscardTransaction(C.CString(txId))
+			rawResponse := DiscardTransaction(C.CString(txID))
 
-			if err := json.Unmarshal([]byte(C.GoString(rawResponse)), &discardResponse); err != nil {
+			if err = json.Unmarshal([]byte(C.GoString(rawResponse)), &discardResponse); err != nil {
-				t.Errorf("cannot decode RecoverAccount reponse (%s): %v", C.GoString(rawResponse), err)
+				t.Errorf("cannot decode RecoverAccount response (%s): %v", C.GoString(rawResponse), err)
 			}
 
 			if discardResponse.Error != "" {
@@ -1017,15 +1034,15 @@ func testDiscardTransaction(t *testing.T) bool {
 			}
 
 			// try completing discarded transaction
-			_, err = geth.CompleteTransaction(txId, testConfig.Account1.Password)
+			_, err = geth.CompleteTransaction(txID, testConfig.Account1.Password)
-			if err.Error() != "transaction hash not found" {
+			if err != status.ErrQueuedTxIDNotFound {
 				t.Error("expects tx not found, but call to CompleteTransaction succeeded")
 				return
 			}
 
 			time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txID)
 				return
 			}
 
@@ -1102,13 +1119,13 @@ func testDiscardMultipleQueuedTransactions(t *testing.T) bool {
 
 	// make sure you panic if transaction complete doesn't return
 	testTxCount := 3
-	txIds := make(chan string, testTxCount)
+	txIDs := make(chan string, testTxCount)
 	allTestTxDiscarded := make(chan struct{}, 1)
 
 	// replace transaction notification handler
 	txFailedEventCallCount := 0
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
-		var txId string
+		var txID string
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -1116,15 +1133,15 @@ func testDiscardMultipleQueuedTransactions(t *testing.T) bool {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txID)
 
-			if !backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if !backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should still have test tx: %s", txId)
+				t.Errorf("txqueue should still have test tx: %s", txID)
 				return
 			}
 
-			txIds <- txId
+			txIDs <- txID
 		}
 
 		if envelope.Type == geth.EventTransactionFailed {
@@ -1170,64 +1187,73 @@ func testDiscardMultipleQueuedTransactions(t *testing.T) bool {
 	}
 
 	// wait for transactions, and discard immediately
-	discardTxs := func(txIdStrings string) {
+	discardTxs := func(txIDStrings string) {
-		var parsedIds []string
+		var parsedIDs []string
-		json.Unmarshal([]byte(txIdStrings), &parsedIds)
+		if err := json.Unmarshal([]byte(txIDStrings), &parsedIDs); err != nil {
+			t.Error(err)
+			return
+		}
 
-		parsedIds = append(parsedIds, "invalid-tx-id")
+		parsedIDs = append(parsedIDs, "invalid-tx-id")
-		updatedTxIdStrings, _ := json.Marshal(parsedIds)
+		updatedTxIDStrings, _ := json.Marshal(parsedIDs)
 
 		// discard
-		discardResultsString := DiscardTransactions(C.CString(string(updatedTxIdStrings)))
+		discardResultsString := DiscardTransactions(C.CString(string(updatedTxIDStrings)))
 		discardResultsStruct := geth.DiscardTransactionsResult{}
-		json.Unmarshal([]byte(C.GoString(discardResultsString)), &discardResultsStruct)
+		if err := json.Unmarshal([]byte(C.GoString(discardResultsString)), &discardResultsStruct); err != nil {
+			t.Error(err)
+			return
+		}
 		discardResults := discardResultsStruct.Results
 
-		if len(discardResults) != 1 || discardResults["invalid-tx-id"].Error != "transaction hash not found" {
+		if len(discardResults) != 1 || discardResults["invalid-tx-id"].Error != status.ErrQueuedTxIDNotFound.Error() {
 			t.Errorf("cannot discard txs: %v", discardResults)
 			return
 		}
 
 		// try completing discarded transaction
-		completeResultsString := CompleteTransactions(C.CString(string(updatedTxIdStrings)), C.CString(testConfig.Account1.Password))
+		completeResultsString := CompleteTransactions(C.CString(string(updatedTxIDStrings)), C.CString(testConfig.Account1.Password))
 		completeResultsStruct := geth.CompleteTransactionsResult{}
-		json.Unmarshal([]byte(C.GoString(completeResultsString)), &completeResultsStruct)
+		if err := json.Unmarshal([]byte(C.GoString(completeResultsString)), &completeResultsStruct); err != nil {
+			t.Error(err)
+			return
+		}
 		completeResults := completeResultsStruct.Results
 
 		if len(completeResults) != (testTxCount + 1) {
 			t.Error("unexpected number of errors (call to CompleteTransaction should not succeed)")
 		}
-		for txId, txResult := range completeResults {
+		for txID, txResult := range completeResults {
-			if txId != txResult.Id {
+			if txID != txResult.ID {
-				t.Errorf("tx id not set in result: expected id is %s", txId)
+				t.Errorf("tx id not set in result: expected id is %s", txID)
 				return
 			}
-			if txResult.Error != "transaction hash not found" {
+			if txResult.Error != status.ErrQueuedTxIDNotFound.Error() {
 				t.Errorf("invalid error for %s", txResult.Hash)
 				return
 			}
-			if txResult.Hash != "0x0000000000000000000000000000000000000000000000000000000000000000" {
+			if txResult.Hash != zeroHash {
 				t.Errorf("invalid hash (expected zero): %s", txResult.Hash)
 				return
 			}
 		}
 
 		time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-		for _, txId := range parsedIds {
+		for _, txID := range parsedIDs {
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txID)
 				return
 			}
 		}
 	}
 	go func() {
-		var txIdStrings []string
+		var txIDStrings []string
 		for i := 0; i < testTxCount; i++ {
-			txIdStrings = append(txIdStrings, <-txIds)
+			txIDStrings = append(txIDStrings, <-txIDs)
 		}
 
-		txIdJSON, _ := json.Marshal(txIdStrings)
+		txIDJSON, _ := json.Marshal(txIDStrings)
-		discardTxs(string(txIdJSON))
+		discardTxs(string(txIDJSON))
 	}()
 
 	// send multiple transactions
@@ -1319,8 +1345,12 @@ func startTestNode(t *testing.T) <-chan struct{} {
 	}
 
 	// inject test accounts
-	geth.ImportTestAccount(filepath.Join(geth.TestDataDir, "keystore"), "test-account1.pk")
+	if err := geth.ImportTestAccount(filepath.Join(geth.TestDataDir, "keystore"), "test-account1.pk"); err != nil {
-	geth.ImportTestAccount(filepath.Join(geth.TestDataDir, "keystore"), "test-account2.pk")
+		panic(err)
+	}
+	if err := geth.ImportTestAccount(filepath.Join(geth.TestDataDir, "keystore"), "test-account2.pk"); err != nil {
+		panic(err)
+	}
 
 	waitForNodeStart := make(chan struct{}, 1)
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
@@ -1356,7 +1386,7 @@ func startTestNode(t *testing.T) <-chan struct{} {
 
 	go func() {
 		configJSON := `{
-			"NetworkId": ` + strconv.Itoa(params.TestNetworkId) + `,
+			"NetworkId": ` + strconv.Itoa(params.TestNetworkID) + `,
 			"DataDir": "` + geth.TestDataDir + `",
 			"HTTPPort": ` + strconv.Itoa(testConfig.Node.HTTPPort) + `,
 			"WSPort": ` + strconv.Itoa(testConfig.Node.WSPort) + `,
@@ -1364,11 +1394,13 @@ func startTestNode(t *testing.T) <-chan struct{} {
 			"LogLevel": "INFO"
 		}`
 		response := StartNode(C.CString(configJSON))
-		err := geth.JSONError{}
+		responseErr := geth.JSONError{}
 
-		json.Unmarshal([]byte(C.GoString(response)), &err)
+		if err := json.Unmarshal([]byte(C.GoString(response)), &responseErr); err != nil {
-		if err.Error != "" {
+			panic(err)
-			panic("cannot start node: " + err.Error)
+		}
+		if responseErr.Error != "" {
+			panic("cannot start node: " + responseErr.Error)
 		}
 	}()
 

cmd/statusd/wnodecmd.go

@@ -11,53 +11,79 @@ import (
 )
 
 var (
+	// WhisperEchoModeFlag enables/disables Echo mode (arguments are printed for diagnostics)
 	WhisperEchoModeFlag = cli.BoolTFlag{
 		Name:  "echo",
 		Usage: "Echo mode, prints some arguments for diagnostics (default: true)",
 	}
+
+	// WhisperBootstrapNodeFlag marks node as not actively listening for incoming connections
 	WhisperBootstrapNodeFlag = cli.BoolTFlag{
 		Name:  "bootstrap",
 		Usage: "Don't actively connect to peers, wait for incoming connections (default: true)",
 	}
+
+	// WhisperNotificationServerNodeFlag enables/disables Push Notifications services
 	WhisperNotificationServerNodeFlag = cli.BoolFlag{
 		Name:  "notify",
 		Usage: "Node is capable of sending Push Notifications",
 	}
+
+	// WhisperForwarderNodeFlag enables/disables message forwarding
+	// (when neither sends nor decrypts envelopes, just forwards them)
 	WhisperForwarderNodeFlag = cli.BoolFlag{
 		Name:  "forward",
 		Usage: "Only forward messages, neither send nor decrypt messages",
 	}
+
+	// WhisperMailserverNodeFlag enables/disables Inboxing services
 	WhisperMailserverNodeFlag = cli.BoolFlag{
 		Name:  "mailserver",
 		Usage: "Delivers expired messages on demand",
 	}
+
+	// WhisperIdentityFile is path to file containing private key of the node (for asymmetric encryption)
 	WhisperIdentityFile = cli.StringFlag{
 		Name:  "identity",
-		Usage: "Protocol identity file (private key used for asymetric encryption)",
+		Usage: "Protocol identity file (private key used for asymmetric encryption)",
 	}
+
+	// WhisperPasswordFile is password used to do a symmetric encryption
 	WhisperPasswordFile = cli.StringFlag{
 		Name:  "password",
 		Usage: "Password file (password is used for symmetric encryption)",
 	}
+
+	// WhisperPortFlag defines port on which Whisper protocol is listening
 	WhisperPortFlag = cli.IntFlag{
 		Name:  "port",
 		Usage: "Whisper node's listening port",
 		Value: params.WhisperPort,
 	}
+
+	// WhisperPoWFlag is the minimum PoW required by the node
 	WhisperPoWFlag = cli.Float64Flag{
 		Name:  "pow",
 		Usage: "PoW for messages to be added to queue, in float format",
 		Value: params.WhisperMinimumPoW,
 	}
+
+	// WhisperTTLFlag defines node's default TTL for envelopes
 	WhisperTTLFlag = cli.IntFlag{
 		Name:  "ttl",
 		Usage: "Time to live for messages, in seconds",
 		Value: params.WhisperTTL,
 	}
+
+	// WhisperInjectTestAccounts if set, then test accounts will be imported
+	// into node's key store, and then will be injected as key pairs (identities)
+	// into the Whisper as well.
 	WhisperInjectTestAccounts = cli.BoolTFlag{
 		Name:  "injectaccounts",
 		Usage: "Whether test account should be injected or not (default: true)",
 	}
+
+	// FirebaseAuthorizationKey path to file containing FCM password
 	FirebaseAuthorizationKey = cli.StringFlag{
 		Name:  "firebaseauth",
 		Usage: "FCM Authorization Key used for sending Push Notifications",
@@ -97,19 +123,27 @@ func wnode(ctx *cli.Context) error {
 
 	// import test accounts
 	if ctx.BoolT(WhisperInjectTestAccounts.Name) {
-		geth.ImportTestAccount(filepath.Join(config.DataDir, "keystore"), "test-account1.pk")
+		if err = geth.ImportTestAccount(filepath.Join(config.DataDir, "keystore"), "test-account1.pk"); err != nil {
-		geth.ImportTestAccount(filepath.Join(config.DataDir, "keystore"), "test-account2.pk")
+			return err
+		}
+		if err = geth.ImportTestAccount(filepath.Join(config.DataDir, "keystore"), "test-account2.pk"); err != nil {
+			return err
+		}
 	}
 
-	if err := geth.CreateAndRunNode(config); err != nil {
+	if err = geth.CreateAndRunNode(config); err != nil {
 		return err
 	}
 
 	// inject test accounts into Whisper
 	if ctx.BoolT(WhisperInjectTestAccounts.Name) {
 		testConfig, _ := geth.LoadTestConfig()
-		injectAccountIntoWhisper(testConfig.Account1.Address, testConfig.Account1.Password)
+		if err = injectAccountIntoWhisper(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
-		injectAccountIntoWhisper(testConfig.Account2.Address, testConfig.Account2.Password)
+			return err
+		}
+		if err = injectAccountIntoWhisper(testConfig.Account2.Address, testConfig.Account2.Password); err != nil {
+			return err
+		}
 	}
 
 	// wait till node has been stopped
@@ -204,7 +238,7 @@ func injectAccountIntoWhisper(address, password string) error {
 		return geth.ErrAddressToAccountMappingFailure
 	}
 
-	account, accountKey, err := keyStore.AccountDecryptedKey(account, password)
+	_, accountKey, err := keyStore.AccountDecryptedKey(account, password)
 	if err != nil {
 		return fmt.Errorf("%s: %v", geth.ErrAccountToKeyMappingFailure.Error(), err)
 	}
@@ -213,7 +247,9 @@ func injectAccountIntoWhisper(address, password string) error {
 	if err != nil {
 		return err
 	}
-	whisperService.AddKeyPair(accountKey.PrivateKey)
+	if _, err = whisperService.AddKeyPair(accountKey.PrivateKey); err != nil {
+		return err
+	}
 
 	return nil
 }

extkeys/hdkey.go

@@ -42,6 +42,7 @@ import (
 // TODO make sure we're doing this ^^^^ !!!!!!
 
 const (
+	// HardenedKeyStart defines a starting point for hardened key.
 	// Each extended key has 2^31 normal child keys and 2^31 hardened child keys.
 	// Thus the range for normal child keys is [0, 2^31 - 1] and the range for hardened child keys is [2^31, 2^32 - 1].
 	HardenedKeyStart = 0x80000000 // 2^31
@@ -58,31 +59,40 @@ const (
 	// public/private key data.
 	serializedKeyLen = 4 + 1 + 4 + 4 + 32 + 33 // 78 bytes
 
-	CoinTypeBTC     = 0  // 0x80000000
+	// CoinTypeBTC is BTC coin type
-	CoinTypeTestNet = 1  // 0x80000001
+	CoinTypeBTC = 0 // 0x80000000
-	CoinTypeETH     = 60 // 0x8000003c
-	CoinTypeETC     = 60 // 0x80000000
 
+	// CoinTypeTestNet is test net coin type
+	CoinTypeTestNet = 1 // 0x80000001
+
+	// CoinTypeETH is ETH coin type
+	CoinTypeETH = 60 // 0x8000003c
+
+	// EmptyExtendedKeyString marker string for zero extended key
 	EmptyExtendedKeyString = "Zeroed extended key"
 )
 
+// errors
 var (
 	ErrInvalidKey                 = errors.New("key is invalid")
 	ErrInvalidSeed                = errors.New("seed is invalid")
 	ErrInvalidSeedLen             = fmt.Errorf("the recommended size of seed is %d-%d bits", MinSeedBytes, MaxSeedBytes)
-	ErrDerivingPrivateFromPublic  = errors.New("cannot derive private key from public key")
 	ErrDerivingHardenedFromPublic = errors.New("cannot derive a hardened key from public key")
 	ErrBadChecksum                = errors.New("bad extended key checksum")
 	ErrInvalidKeyLen              = errors.New("serialized extended key length is invalid")
 	ErrDerivingChild              = errors.New("error deriving child key")
 	ErrInvalidMasterKey           = errors.New("invalid master key supplied")
-
-	PrivateKeyVersion, _ = hex.DecodeString("0488ADE4")
-	PublicKeyVersion, _  = hex.DecodeString("0488B21E")
 )
 
-type CoinType int
+var (
+	// PrivateKeyVersion is version for private key
+	PrivateKeyVersion, _ = hex.DecodeString("0488ADE4")
 
+	// PublicKeyVersion is version for public key
+	PublicKeyVersion, _ = hex.DecodeString("0488B21E")
+)
+
+// ExtendedKey represents BIP44-compliant HD key
 type ExtendedKey struct {
 	Version          []byte // 4 bytes, mainnet: 0x0488B21E public, 0x0488ADE4 private; testnet: 0x043587CF public, 0x04358394 private
 	Depth            uint16 // 1 byte,  depth: 0x00 for master nodes, 0x01 for level-1 derived keys, ....
@@ -133,10 +143,10 @@ func NewMaster(seed, salt []byte) (*ExtendedKey, error) {
 // 2) Private extended key -> Non-hardened child private extended key
 // 3) Public extended key -> Non-hardened child public extended key
 // 4) Public extended key -> Hardened child public extended key (INVALID!)
-func (parent *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
+func (k *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
 	// A hardened child may not be created from a public extended key (Case #4).
 	isChildHardened := i >= HardenedKeyStart
-	if !parent.IsPrivate && isChildHardened {
+	if !k.IsPrivate && isChildHardened {
 		return nil, ErrDerivingHardenedFromPublic
 	}
 
@@ -144,30 +154,30 @@ func (parent *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
 	seed := make([]byte, keyLen+4)
 	if isChildHardened {
 		// Case #1: 0x00 || ser256(parentKey) || ser32(i)
-		copy(seed[1:], parent.KeyData) // 0x00 || ser256(parentKey)
+		copy(seed[1:], k.KeyData) // 0x00 || ser256(parentKey)
 	} else {
 		// Case #2 and #3: serP(parentPubKey) || ser32(i)
-		copy(seed, parent.pubKeyBytes())
+		copy(seed, k.pubKeyBytes())
 	}
 	binary.BigEndian.PutUint32(seed[keyLen:], i)
 
-	secretKey, chainCode, err := splitHMAC(seed, parent.ChainCode)
+	secretKey, chainCode, err := splitHMAC(seed, k.ChainCode)
 	if err != nil {
 		return nil, err
 	}
 
 	child := &ExtendedKey{
 		ChainCode:   chainCode,
-		Depth:       parent.Depth + 1,
+		Depth:       k.Depth + 1,
 		ChildNumber: i,
-		IsPrivate:   parent.IsPrivate,
+		IsPrivate:   k.IsPrivate,
 		// The fingerprint for the derived child is the first 4 bytes of parent's
-		FingerPrint: btcutil.Hash160(parent.pubKeyBytes())[:4],
+		FingerPrint: btcutil.Hash160(k.pubKeyBytes())[:4],
 	}
 
-	if parent.IsPrivate {
+	if k.IsPrivate {
 		// Case #1 or #2: childKey = parse256(IL) + parentKey
-		parentKeyBigInt := new(big.Int).SetBytes(parent.KeyData)
+		parentKeyBigInt := new(big.Int).SetBytes(k.KeyData)
 		keyBigInt := new(big.Int).SetBytes(secretKey)
 		keyBigInt.Add(keyBigInt, parentKeyBigInt)
 		keyBigInt.Mod(keyBigInt, btcec.S256().N)
@@ -185,7 +195,7 @@ func (parent *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
 
 		// Convert the serialized compressed parent public key into X and Y coordinates
 		// so it can be added to the intermediate public key.
-		pubKey, err := btcec.ParsePubKey(parent.KeyData, btcec.S256())
+		pubKey, err := btcec.ParsePubKey(k.KeyData, btcec.S256())
 		if err != nil {
 			return nil, err
 		}
@@ -201,17 +211,17 @@ func (parent *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
 
 // BIP44Child returns Status CKD#i (where i is child index).
 // BIP44 format is used: m / purpose' / coin_type' / account' / change / address_index
-func (master *ExtendedKey) BIP44Child(coinType, i uint32) (*ExtendedKey, error) {
+func (k *ExtendedKey) BIP44Child(coinType, i uint32) (*ExtendedKey, error) {
-	if !master.IsPrivate {
+	if !k.IsPrivate {
 		return nil, ErrInvalidMasterKey
 	}
 
-	if master.Depth != 0 {
+	if k.Depth != 0 {
 		return nil, ErrInvalidMasterKey
 	}
 
 	// m/44'/60'/0'/0/index
-	extKey, err := master.Derive([]uint32{
+	extKey, err := k.Derive([]uint32{
 		HardenedKeyStart + 44,       // purpose
 		HardenedKeyStart + coinType, // cointype
 		HardenedKeyStart + 0,        // account
@@ -225,9 +235,10 @@ func (master *ExtendedKey) BIP44Child(coinType, i uint32) (*ExtendedKey, error)
 	return extKey, nil
 }
 
-func (parent *ExtendedKey) Derive(path []uint32) (*ExtendedKey, error) {
+// Derive returns a derived child key at a given path
+func (k *ExtendedKey) Derive(path []uint32) (*ExtendedKey, error) {
 	var err error
-	extKey := parent
+	extKey := k
 	for _, i := range path {
 		extKey, err = extKey.Child(i)
 		if err != nil {
@@ -238,6 +249,8 @@ func (parent *ExtendedKey) Derive(path []uint32) (*ExtendedKey, error) {
 	return extKey, nil
 }
 
+// Neuter returns a new extended public key from a give extended private key.
+// If the input extended key is already public, it will be returned unaltered.
 func (k *ExtendedKey) Neuter() (*ExtendedKey, error) {
 	// Already an extended public key.
 	if !k.IsPrivate {

extkeys/hdkey_test.go

@@ -164,240 +164,219 @@ tests:
 	}
 }
 
-func TestPrivateChildDerivation(t *testing.T) {
+func TestChildDerivation(t *testing.T) {
-	// The private extended keys for test vectors in [BIP32].
+	type testCase struct {
-	testVec1MasterPrivKey := "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi"
-	testVec2MasterPrivKey := "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U"
-
-	tests := []struct {
-		name     string
-		master   string
-		path     []uint32
-		wantPriv string
-	}{
-		// Test vector 1
-		{
-			name:     "test vector 1 chain m",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{},
-			wantPriv: "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
-		},
-		{
-			name:     "test vector 1 chain m/0",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{0},
-			wantPriv: "xprv9uHRZZhbkedL37eZEnyrNsQPFZYRAvjy5rt6M1nbEkLSo378x1CQQLo2xxBvREwiK6kqf7GRNvsNEchwibzXaV6i5GcsgyjBeRguXhKsi4R",
-		},
-		{
-			name:     "test vector 1 chain m/0/1",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{0, 1},
-			wantPriv: "xprv9ww7sMFLzJMzy7bV1qs7nGBxgKYrgcm3HcJvGb4yvNhT9vxXC7eX7WVULzCfxucFEn2TsVvJw25hH9d4mchywguGQCZvRgsiRaTY1HCqN8G",
-		},
-		{
-			name:     "test vector 1 chain m/0/1/2",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{0, 1, 2},
-			wantPriv: "xprv9xrdP7iD2L1YZCgR9AecDgpDMZSTzP5KCfUykGXgjBxLgp1VFHsEeL3conzGAkbc1MigG1o8YqmfEA2jtkPdf4vwMaGJC2YSDbBTPAjfRUi",
-		},
-		{
-			name:     "test vector 1 chain m/0/1/2/2",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{0, 1, 2, 2},
-			wantPriv: "xprvA2J8Hq4eiP7xCEBP7gzRJGJnd9CHTkEU6eTNMrZ6YR7H5boik8daFtDZxmJDfdMSKHwroCfAfsBKWWidRfBQjpegy6kzXSkQGGoMdWKz5Xh",
-		},
-		{
-			name:     "test vector 1 chain m/0/1/2/2/1000000000",
-			master:   testVec1MasterPrivKey,
-			path:     []uint32{0, 1, 2, 2, 1000000000},
-			wantPriv: "xprvA3XhazxncJqJsQcG85Gg61qwPQKiobAnWjuPpjKhExprZjfse6nErRwTMwGe6uGWXPSykZSTiYb2TXAm7Qhwj8KgRd2XaD21Styu6h6AwFz",
-		},
-
-		// Test vector 2
-		{
-			name:     "test vector 2 chain m",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{},
-			wantPriv: "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U",
-		},
-		{
-			name:     "test vector 2 chain m/0",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{0},
-			wantPriv: "xprv9vHkqa6EV4sPZHYqZznhT2NPtPCjKuDKGY38FBWLvgaDx45zo9WQRUT3dKYnjwih2yJD9mkrocEZXo1ex8G81dwSM1fwqWpWkeS3v86pgKt",
-		},
-		{
-			name:     "test vector 2 chain m/0/2147483647",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{0, 2147483647},
-			wantPriv: "xprv9wSp6B7cXJWXZRpDbxkFg3ry2fuSyUfvboJ5Yi6YNw7i1bXmq9QwQ7EwMpeG4cK2pnMqEx1cLYD7cSGSCtruGSXC6ZSVDHugMsZgbuY62m6",
-		},
-		{
-			name:     "test vector 2 chain m/0/2147483647/1",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{0, 2147483647, 1},
-			wantPriv: "xprv9ysS5br6UbWCRCJcggvpUNMyhVWgD7NypY9gsVTMYmuRtZg8izyYC5Ey4T931WgWbfJwRDwfVFqV3b29gqHDbuEpGcbzf16pdomk54NXkSm",
-		},
-		{
-			name:     "test vector 2 chain m/0/2147483647/1/2147483646",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{0, 2147483647, 1, 2147483646},
-			wantPriv: "xprvA2LfeWWwRCxh4iqigcDMnUf2E3nVUFkntc93nmUYBtb9rpSPYWa8MY3x9ZHSLZkg4G84UefrDruVK3FhMLSJsGtBx883iddHNuH1LNpRrEp",
-		},
-		{
-			name:     "test vector 2 chain m/0/2147483647/1/2147483646/2",
-			master:   testVec2MasterPrivKey,
-			path:     []uint32{0, 2147483647, 1, 2147483646, 2},
-			wantPriv: "xprvA48ALo8BDjcRET68R5RsPzF3H7WeyYYtHcyUeLRGBPHXu6CJSGjwW7dWoeUWTEzT7LG3qk6Eg6x2ZoqD8gtyEFZecpAyvchksfLyg3Zbqam",
-		},
-
-		// Custom tests to trigger specific conditions.
-		{
-			// Seed 000000000000000000000000000000da.
-			name:     "Derived privkey with zero high byte m/0",
-			master:   "xprv9s21ZrQH143K4FR6rNeqEK4EBhRgLjWLWhA3pw8iqgAKk82ypz58PXbrzU19opYcxw8JDJQF4id55PwTsN1Zv8Xt6SKvbr2KNU5y8jN8djz",
-			path:     []uint32{0},
-			wantPriv: "xprv9uC5JqtViMmgcAMUxcsBCBFA7oYCNs4bozPbyvLfddjHou4rMiGEHipz94xNaPb1e4f18TRoPXfiXx4C3cDAcADqxCSRSSWLvMBRWPctSN9",
-		},
-	}
-
-tests:
-	for i, test := range tests {
-		extKey, err := extkeys.NewKeyFromString(test.master)
-		if err != nil {
-			t.Errorf("NewKeyFromString #%d (%s): unexpected error creating extended key: %v", i, test.name, err)
-			continue
-		}
-		extKey, err = extKey.Derive(test.path)
-		if err != nil {
-			t.Errorf("cannot derive child: %v", err)
-			continue tests
-		}
-
-		privStr := extKey.String()
-		if privStr != test.wantPriv {
-			t.Errorf("Child #%d (%s): mismatched serialized private extended key -- got: %s, want: %s",
-				i, test.name, privStr, test.wantPriv)
-			continue
-		} else {
-			t.Logf("test %d (%s): %s", i, test.name, extKey.String())
-		}
-	}
-
-}
-
-// TestPublicDerivation tests several vectors which derive public keys from
-// other public keys works as intended.
-func TestPublicDerivation(t *testing.T) {
-	// The public extended keys for test vectors in [BIP32].
-	testVec1MasterPubKey := "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8"
-	testVec2MasterPubKey := "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB"
-
-	tests := []struct {
 		name    string
 		master  string
 		path    []uint32
-		wantPub string
+		wantKey string
-	}{
-		// Test vector 1
-		{
-			name:    "test vector 1 chain m",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{},
-			wantPub: "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
-		},
-		{
-			name:    "test vector 1 chain m/0",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{0},
-			wantPub: "xpub68Gmy5EVb2BdFbj2LpWrk1M7obNuaPTpT5oh9QCCo5sRfqSHVYWex97WpDZzszdzHzxXDAzPLVSwybe4uPYkSk4G3gnrPqqkV9RyNzAcNJ1",
-		},
-		{
-			name:    "test vector 1 chain m/0/1",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{0, 1},
-			wantPub: "xpub6AvUGrnEpfvJBbfx7sQ89Q8hEMPM65UteqEX4yUbUiES2jHfjexmfJoxCGSwFMZiPBaKQT1RiKWrKfuDV4vpgVs4Xn8PpPTR2i79rwHd4Zr",
-		},
-		{
-			name:    "test vector 1 chain m/0/1/2",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{0, 1, 2},
-			wantPub: "xpub6BqyndF6rhZqmgktFCBcapkwubGxPqoAZtQaYewJHXVKZcLdnqBVC8N6f6FSHWUghjuTLeubWyQWfJdk2G3tGgvgj3qngo4vLTnnSjAZckv",
-		},
-		{
-			name:    "test vector 1 chain m/0/1/2/2",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{0, 1, 2, 2},
-			wantPub: "xpub6FHUhLbYYkgFQiFrDiXRfQFXBB2msCxKTsNyAExi6keFxQ8sHfwpogY3p3s1ePSpUqLNYks5T6a3JqpCGszt4kxbyq7tUoFP5c8KWyiDtPp",
-		},
-		{
-			name:    "test vector 1 chain m/0/1/2/2/1000000000",
-			master:  testVec1MasterPubKey,
-			path:    []uint32{0, 1, 2, 2, 1000000000},
-			wantPub: "xpub6GX3zWVgSgPc5tgjE6ogT9nfwSADD3tdsxpzd7jJoJMqSY12Be6VQEFwDCp6wAQoZsH2iq5nNocHEaVDxBcobPrkZCjYW3QUmoDYzMFBDu9",
-		},
-
-		// Test vector 2
-		{
-			name:    "test vector 2 chain m",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{},
-			wantPub: "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB",
-		},
-		{
-			name:    "test vector 2 chain m/0",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{0},
-			wantPub: "xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH",
-		},
-		{
-			name:    "test vector 2 chain m/0/2147483647",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{0, 2147483647},
-			wantPub: "xpub6ASAVgeWMg4pmutghzHG3BohahjwNwPmy2DgM6W9wGegtPrvNgjBwuZRD7hSDFhYfunq8vDgwG4ah1gVzZysgp3UsKz7VNjCnSUJJ5T4fdD",
-		},
-		{
-			name:    "test vector 2 chain m/0/2147483647/1",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{0, 2147483647, 1},
-			wantPub: "xpub6CrnV7NzJy4VdgP5niTpqWJiFXMAca6qBm5Hfsry77SQmN1HGYHnjsZSujoHzdxf7ZNK5UVrmDXFPiEW2ecwHGWMFGUxPC9ARipss9rXd4b",
-		},
-		{
-			name:    "test vector 2 chain m/0/2147483647/1/2147483646",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{0, 2147483647, 1, 2147483646},
-			wantPub: "xpub6FL2423qFaWzHCvBndkN9cbkn5cysiUeFq4eb9t9kE88jcmY63tNuLNRzpHPdAM4dUpLhZ7aUm2cJ5zF7KYonf4jAPfRqTMTRBNkQL3Tfta",
-		},
-		{
-			name:    "test vector 2 chain m/0/2147483647/1/2147483646/2",
-			master:  testVec2MasterPubKey,
-			path:    []uint32{0, 2147483647, 1, 2147483646, 2},
-			wantPub: "xpub6H7WkJf547AiSwAbX6xsm8Bmq9M9P1Gjequ5SipsjipWmtXSyp4C3uwzewedGEgAMsDy4jEvNTWtxLyqqHY9C12gaBmgUdk2CGmwachwnWK",
-		},
 	}
 
-tests:
+	// derive public keys from private keys
-	for i, test := range tests {
+	getPrivateChildDerivationTests := func() []testCase {
-		extKey, err := extkeys.NewKeyFromString(test.master)
+		// The private extended keys for test vectors in [BIP32].
-		if err != nil {
+		testVec1MasterPrivKey := "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi"
-			t.Errorf("NewKeyFromString #%d (%s): unexpected error creating extended key: %v", i, test.name, err)
+		testVec2MasterPrivKey := "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U"
-			continue
+
+		return []testCase{
+			// Test vector 1
+			{
+				name:    "test vector 1 chain m",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{},
+				wantKey: "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
+			},
+			{
+				name:    "test vector 1 chain m/0",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{0},
+				wantKey: "xprv9uHRZZhbkedL37eZEnyrNsQPFZYRAvjy5rt6M1nbEkLSo378x1CQQLo2xxBvREwiK6kqf7GRNvsNEchwibzXaV6i5GcsgyjBeRguXhKsi4R",
+			},
+			{
+				name:    "test vector 1 chain m/0/1",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{0, 1},
+				wantKey: "xprv9ww7sMFLzJMzy7bV1qs7nGBxgKYrgcm3HcJvGb4yvNhT9vxXC7eX7WVULzCfxucFEn2TsVvJw25hH9d4mchywguGQCZvRgsiRaTY1HCqN8G",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{0, 1, 2},
+				wantKey: "xprv9xrdP7iD2L1YZCgR9AecDgpDMZSTzP5KCfUykGXgjBxLgp1VFHsEeL3conzGAkbc1MigG1o8YqmfEA2jtkPdf4vwMaGJC2YSDbBTPAjfRUi",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2/2",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{0, 1, 2, 2},
+				wantKey: "xprvA2J8Hq4eiP7xCEBP7gzRJGJnd9CHTkEU6eTNMrZ6YR7H5boik8daFtDZxmJDfdMSKHwroCfAfsBKWWidRfBQjpegy6kzXSkQGGoMdWKz5Xh",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2/2/1000000000",
+				master:  testVec1MasterPrivKey,
+				path:    []uint32{0, 1, 2, 2, 1000000000},
+				wantKey: "xprvA3XhazxncJqJsQcG85Gg61qwPQKiobAnWjuPpjKhExprZjfse6nErRwTMwGe6uGWXPSykZSTiYb2TXAm7Qhwj8KgRd2XaD21Styu6h6AwFz",
+			},
+
+			// Test vector 2
+			{
+				name:    "test vector 2 chain m",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{},
+				wantKey: "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U",
+			},
+			{
+				name:    "test vector 2 chain m/0",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{0},
+				wantKey: "xprv9vHkqa6EV4sPZHYqZznhT2NPtPCjKuDKGY38FBWLvgaDx45zo9WQRUT3dKYnjwih2yJD9mkrocEZXo1ex8G81dwSM1fwqWpWkeS3v86pgKt",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{0, 2147483647},
+				wantKey: "xprv9wSp6B7cXJWXZRpDbxkFg3ry2fuSyUfvboJ5Yi6YNw7i1bXmq9QwQ7EwMpeG4cK2pnMqEx1cLYD7cSGSCtruGSXC6ZSVDHugMsZgbuY62m6",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{0, 2147483647, 1},
+				wantKey: "xprv9ysS5br6UbWCRCJcggvpUNMyhVWgD7NypY9gsVTMYmuRtZg8izyYC5Ey4T931WgWbfJwRDwfVFqV3b29gqHDbuEpGcbzf16pdomk54NXkSm",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1/2147483646",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{0, 2147483647, 1, 2147483646},
+				wantKey: "xprvA2LfeWWwRCxh4iqigcDMnUf2E3nVUFkntc93nmUYBtb9rpSPYWa8MY3x9ZHSLZkg4G84UefrDruVK3FhMLSJsGtBx883iddHNuH1LNpRrEp",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1/2147483646/2",
+				master:  testVec2MasterPrivKey,
+				path:    []uint32{0, 2147483647, 1, 2147483646, 2},
+				wantKey: "xprvA48ALo8BDjcRET68R5RsPzF3H7WeyYYtHcyUeLRGBPHXu6CJSGjwW7dWoeUWTEzT7LG3qk6Eg6x2ZoqD8gtyEFZecpAyvchksfLyg3Zbqam",
+			},
+
+			// Custom tests to trigger specific conditions.
+			{
+				// Seed 000000000000000000000000000000da.
+				name:    "Derived privkey with zero high byte m/0",
+				master:  "xprv9s21ZrQH143K4FR6rNeqEK4EBhRgLjWLWhA3pw8iqgAKk82ypz58PXbrzU19opYcxw8JDJQF4id55PwTsN1Zv8Xt6SKvbr2KNU5y8jN8djz",
+				path:    []uint32{0},
+				wantKey: "xprv9uC5JqtViMmgcAMUxcsBCBFA7oYCNs4bozPbyvLfddjHou4rMiGEHipz94xNaPb1e4f18TRoPXfiXx4C3cDAcADqxCSRSSWLvMBRWPctSN9",
+			},
 		}
 
-		extKey, err = extKey.Derive(test.path)
+	}
-		if err != nil {
-			t.Errorf("cannot derive child: %v", err)
-			continue tests
-		}
 
-		pubStr := extKey.String()
+	// derive public keys from other public keys
-		if pubStr != test.wantPub {
+	getPublicChildDerivationTests := func() []testCase {
-			t.Errorf("Child #%d (%s): mismatched serialized public extended key -- got: %s, want: %s", i, test.name, pubStr, test.wantPub)
+		// The public extended keys for test vectors in [BIP32].
-			continue
+		testVec1MasterPubKey := "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8"
-		} else {
+		testVec2MasterPubKey := "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB"
-			t.Logf("test %d (%s): %s", i, test.name, extKey.String())
+
+		return []testCase{
+			// Test vector 1
+			{
+				name:    "test vector 1 chain m",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{},
+				wantKey: "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
+			},
+			{
+				name:    "test vector 1 chain m/0",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{0},
+				wantKey: "xpub68Gmy5EVb2BdFbj2LpWrk1M7obNuaPTpT5oh9QCCo5sRfqSHVYWex97WpDZzszdzHzxXDAzPLVSwybe4uPYkSk4G3gnrPqqkV9RyNzAcNJ1",
+			},
+			{
+				name:    "test vector 1 chain m/0/1",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{0, 1},
+				wantKey: "xpub6AvUGrnEpfvJBbfx7sQ89Q8hEMPM65UteqEX4yUbUiES2jHfjexmfJoxCGSwFMZiPBaKQT1RiKWrKfuDV4vpgVs4Xn8PpPTR2i79rwHd4Zr",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{0, 1, 2},
+				wantKey: "xpub6BqyndF6rhZqmgktFCBcapkwubGxPqoAZtQaYewJHXVKZcLdnqBVC8N6f6FSHWUghjuTLeubWyQWfJdk2G3tGgvgj3qngo4vLTnnSjAZckv",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2/2",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{0, 1, 2, 2},
+				wantKey: "xpub6FHUhLbYYkgFQiFrDiXRfQFXBB2msCxKTsNyAExi6keFxQ8sHfwpogY3p3s1ePSpUqLNYks5T6a3JqpCGszt4kxbyq7tUoFP5c8KWyiDtPp",
+			},
+			{
+				name:    "test vector 1 chain m/0/1/2/2/1000000000",
+				master:  testVec1MasterPubKey,
+				path:    []uint32{0, 1, 2, 2, 1000000000},
+				wantKey: "xpub6GX3zWVgSgPc5tgjE6ogT9nfwSADD3tdsxpzd7jJoJMqSY12Be6VQEFwDCp6wAQoZsH2iq5nNocHEaVDxBcobPrkZCjYW3QUmoDYzMFBDu9",
+			},
+
+			// Test vector 2
+			{
+				name:    "test vector 2 chain m",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{},
+				wantKey: "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB",
+			},
+			{
+				name:    "test vector 2 chain m/0",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{0},
+				wantKey: "xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{0, 2147483647},
+				wantKey: "xpub6ASAVgeWMg4pmutghzHG3BohahjwNwPmy2DgM6W9wGegtPrvNgjBwuZRD7hSDFhYfunq8vDgwG4ah1gVzZysgp3UsKz7VNjCnSUJJ5T4fdD",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{0, 2147483647, 1},
+				wantKey: "xpub6CrnV7NzJy4VdgP5niTpqWJiFXMAca6qBm5Hfsry77SQmN1HGYHnjsZSujoHzdxf7ZNK5UVrmDXFPiEW2ecwHGWMFGUxPC9ARipss9rXd4b",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1/2147483646",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{0, 2147483647, 1, 2147483646},
+				wantKey: "xpub6FL2423qFaWzHCvBndkN9cbkn5cysiUeFq4eb9t9kE88jcmY63tNuLNRzpHPdAM4dUpLhZ7aUm2cJ5zF7KYonf4jAPfRqTMTRBNkQL3Tfta",
+			},
+			{
+				name:    "test vector 2 chain m/0/2147483647/1/2147483646/2",
+				master:  testVec2MasterPubKey,
+				path:    []uint32{0, 2147483647, 1, 2147483646, 2},
+				wantKey: "xpub6H7WkJf547AiSwAbX6xsm8Bmq9M9P1Gjequ5SipsjipWmtXSyp4C3uwzewedGEgAMsDy4jEvNTWtxLyqqHY9C12gaBmgUdk2CGmwachwnWK",
+			},
 		}
 	}
+
+	runTests := func(tests []testCase) {
+		for i, test := range tests {
+			extKey, err := extkeys.NewKeyFromString(test.master)
+			if err != nil {
+				t.Errorf("NewKeyFromString #%d (%s): unexpected error creating extended key: %v", i, test.name, err)
+				continue
+			}
+			extKey, err = extKey.Derive(test.path)
+			if err != nil {
+				t.Errorf("cannot derive child: %v", err)
+				continue
+			}
+
+			gotKey := extKey.String()
+			if gotKey != test.wantKey {
+				t.Errorf("Child #%d (%s): mismatched serialized extended key -- got: %s, want: %s", i, test.name, gotKey, test.wantKey)
+				continue
+			} else {
+				t.Logf("test %d (%s): %s", i, test.name, extKey.String())
+			}
+		}
+	}
+
+	runTests(getPrivateChildDerivationTests())
+	runTests(getPublicChildDerivationTests())
 }
 
 func TestErrors(t *testing.T) {
@@ -425,6 +404,10 @@ func TestErrors(t *testing.T) {
 
 	password := "badpassword"
 	extKey, err := extkeys.NewMaster(mnemonic.MnemonicSeed(phrase, password), []byte(extkeys.Salt))
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+		return
+	}
 
 	pubKey, err := extKey.Neuter()
 	if err != nil {

extkeys/mnemonic.go

@@ -7,10 +7,11 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"golang.org/x/crypto/pbkdf2"
-	"golang.org/x/text/unicode/norm"
 	"math/big"
 	"strings"
+
+	"golang.org/x/crypto/pbkdf2"
+	"golang.org/x/text/unicode/norm"
 )
 
 // Implementation of BIP39 https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
@@ -24,6 +25,7 @@ import (
 // https://github.com/trezor/python-mnemonic/blob/master/mnemonic/mnemonic.py
 // https://github.com/bitpay/bitcore-mnemonic/blob/master/lib/mnemonic.js (used in eth-lightwallet.js)
 
+// Salt is input salt to mnemonic key
 const Salt = "status-im"
 
 // available dictionaries
@@ -39,6 +41,7 @@ const (
 	totalAvailableLanguages
 )
 
+// Languages is a list of supported languages for which mnemonic keys can be generated
 var Languages = [...]string{
 	"English",
 	"Chinese (Simplified)",
@@ -51,19 +54,26 @@ var Languages = [...]string{
 }
 
 var (
-	Last11BitsMask          = big.NewInt(2047)
+	last11BitsMask          = big.NewInt(2047)
-	RightShift11BitsDivider = big.NewInt(2048)
+	rightShift11BitsDivider = big.NewInt(2048)
-	BigOne                  = big.NewInt(1)
+	bigOne                  = big.NewInt(1)
-	BigTwo                  = big.NewInt(2)
+	bigTwo                  = big.NewInt(2)
 )
 
+// Language is language identifier
 type Language int
+
+// WordList is a list of input strings out of which mnemonic phrase is generated
 type WordList [2048]string
+
+// Mnemonic represents mnemonic generator inited with a given salt
 type Mnemonic struct {
 	salt      string
 	wordLists [totalAvailableLanguages]*WordList
 }
 
+// NewMnemonic returns new mnemonic generator
+// nolint: dupl, misspell
 func NewMnemonic(salt string) *Mnemonic {
 	if len(salt) == 0 {
 		salt = Salt
@@ -85,6 +95,7 @@ func NewMnemonic(salt string) *Mnemonic {
 	return mnemonic
 }
 
+// AvailableLanguages returns list of languages available for mnemonic generation
 func (m *Mnemonic) AvailableLanguages() []Language {
 	languages := make([]Language, totalAvailableLanguages)
 	for language := range m.wordLists {
@@ -97,7 +108,8 @@ func (m *Mnemonic) AvailableLanguages() []Language {
 //
 //}
 
-// To create a binary seed from the mnemonic, we use the PBKDF2 function with a mnemonic sentence (in UTF-8 NFKD)
+// MnemonicSeed creates and returns a binary seed from the mnemonic.
+// We use the PBKDF2 function with a mnemonic sentence (in UTF-8 NFKD)
 // used as the password and the string SALT + passphrase (again in UTF-8 NFKD) used as the salt.
 // The iteration count is set to 2048 and HMAC-SHA512 is used as the pseudo-random function.
 // The length of the derived key is 512 bits (= 64 bytes).
@@ -105,7 +117,7 @@ func (m *Mnemonic) MnemonicSeed(mnemonic string, password string) []byte {
 	return pbkdf2.Key(norm.NFKD.Bytes([]byte(mnemonic)), norm.NFKD.Bytes([]byte(m.salt+password)), 2048, 64, sha512.New)
 }
 
-// Returns a human readable seed for BIP32 Hierarchical Deterministic Wallets
+// MnemonicPhrase returns a human readable seed for BIP32 Hierarchical Deterministic Wallets
 func (m *Mnemonic) MnemonicPhrase(strength, language Language) (string, error) {
 	wordList, err := m.WordList(language)
 	if err != nil {
@@ -149,15 +161,14 @@ func (m *Mnemonic) MnemonicPhrase(strength, language Language) (string, error) {
 	// TODO simplify?
 	for i := uint(0); i < checksumBitLength; i++ {
 		// Bitshift 1 left
-		entropyBigInt.Mul(entropyBigInt, BigTwo)
+		entropyBigInt.Mul(entropyBigInt, bigTwo)
 
 		// Set rightmost bit if leftmost checksum bit is set
-		if uint8(hash[0]&(1<<(7-i))) > 0 {
+		if uint8(hash[0]&(1<<(7-i))) > 0 { // nolint: unconvert
-			entropyBigInt.Or(entropyBigInt, BigOne)
+			entropyBigInt.Or(entropyBigInt, bigOne)
 		}
 	}
 
-	entropy = entropyBigInt.Bytes()
 	word := big.NewInt(0)
 
 	for i := sentenceLength - 1; i >= 0; i-- {
@@ -165,8 +176,8 @@ func (m *Mnemonic) MnemonicPhrase(strength, language Language) (string, error) {
 		// each encoding a number from 0-2047, serving as an index into a wordlist.
 
 		// Get 11 right most bits and bitshift 11 to the right for next time
-		word.And(entropyBigInt, Last11BitsMask)
+		word.And(entropyBigInt, last11BitsMask)
-		entropyBigInt.Div(entropyBigInt, RightShift11BitsDivider)
+		entropyBigInt.Div(entropyBigInt, rightShift11BitsDivider)
 
 		// Get the bytes representing the 11 bits as a 2 byte slice
 		wordBytes := padByteSlice(word.Bytes(), 2)
@@ -179,6 +190,7 @@ func (m *Mnemonic) MnemonicPhrase(strength, language Language) (string, error) {
 	return strings.Join(words, wordSeperator), nil
 }
 
+// ValidMnemonic validates mnemonic string
 func (m *Mnemonic) ValidMnemonic(mnemonic string, language Language) bool {
 	wordList, err := m.WordList(language)
 	if err != nil {
@@ -206,6 +218,7 @@ func (m *Mnemonic) ValidMnemonic(mnemonic string, language Language) bool {
 	return true
 }
 
+// WordList returns list of words for a given language
 func (m *Mnemonic) WordList(language Language) (*WordList, error) {
 	if m.wordLists[language] == nil {
 		return nil, fmt.Errorf("language word list is missing (language id: %d)", language)

extkeys/utils.go

@@ -9,13 +9,16 @@ import (
 	"github.com/btcsuite/btcd/btcec"
 )
 
+// errors
 var (
 	ErrInvalidSecretKey = errors.New("generated secret key cannot be used")
 )
 
 func splitHMAC(seed, salt []byte) (secretKey, chainCode []byte, err error) {
 	data := hmac.New(sha512.New, salt)
-	data.Write(seed)
+	if _, err = data.Write(seed); err != nil {
+		return
+	}
 	I := data.Sum(nil)
 
 	// Split I into two 32-byte sequences, IL and IR.

geth/accounts.go

@@ -10,13 +10,12 @@ import (
 	"github.com/status-im/status-go/extkeys"
 )
 
+// errors
 var (
-	ErrAddressToAccountMappingFailure  = errors.New("cannot retreive a valid account for a given address")
+	ErrAddressToAccountMappingFailure  = errors.New("cannot retrieve a valid account for a given address")
-	ErrAccountToKeyMappingFailure      = errors.New("cannot retreive a valid key for a given account")
+	ErrAccountToKeyMappingFailure      = errors.New("cannot retrieve a valid key for a given account")
-	ErrUnlockCalled                    = errors.New("no need to unlock accounts, login instead")
 	ErrWhisperIdentityInjectionFailure = errors.New("failed to inject identity into Whisper")
 	ErrWhisperClearIdentitiesFailure   = errors.New("failed to clear whisper identities")
-	ErrWhisperNoIdentityFound          = errors.New("failed to locate identity previously injected into Whisper")
 	ErrNoAccountSelected               = errors.New("no account has been selected, please login")
 	ErrInvalidMasterKeyCreated         = errors.New("can not create master extended key")
 	ErrInvalidAccountAddressOrKey      = errors.New("cannot parse address or key to valid account address")
@@ -60,7 +59,7 @@ func CreateChildAccount(parentAddress, password string) (address, pubKey string,
 	}
 
 	if parentAddress == "" && nodeManager.SelectedAccount != nil { // derive from selected account by default
-		parentAddress = string(nodeManager.SelectedAccount.Address.Hex())
+		parentAddress = nodeManager.SelectedAccount.Address.Hex()
 	}
 
 	if parentAddress == "" {
@@ -88,7 +87,9 @@ func CreateChildAccount(parentAddress, password string) (address, pubKey string,
 	if err != nil {
 		return "", "", err
 	}
-	keyStore.IncSubAccountIndex(account, password)
+	if err = keyStore.IncSubAccountIndex(account, password); err != nil {
+		return "", "", err
+	}
 	accountKey.SubAccountIndex++
 
 	// import derived key into account keystore
@@ -206,13 +207,6 @@ func Logout() error {
 	return nil
 }
 
-// UnlockAccount unlocks an existing account for a certain duration and
-// inject the account as a whisper identity if the account was created as
-// a whisper enabled account
-func UnlockAccount(address, password string, seconds int) error {
-	return ErrUnlockCalled
-}
-
 // importExtendedKey processes incoming extended key, extracts required info and creates corresponding account key.
 // Once account key is formed, that key is put (if not already) into keystore i.e. key is *encoded* into key file.
 func importExtendedKey(extKey *extkeys.ExtendedKey, password string) (address, pubKey string, err error) {

geth/accounts_test.go

@@ -11,7 +11,7 @@ import (
 func TestAccountsList(t *testing.T) {
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
 		return
 	}
 
@@ -20,7 +20,9 @@ func TestAccountsList(t *testing.T) {
 		t.Errorf("expected LES service: %v", err)
 	}
 	accounts := les.StatusBackend.AccountManager().Accounts()
-	geth.Logout()
+	if err = geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	// make sure that we start with empty accounts list (nobody has logged in yet)
 	if len(accounts) != 0 {
@@ -121,16 +123,17 @@ func TestAccountsList(t *testing.T) {
 func TestAccountsCreateChildAccount(t *testing.T) {
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
-	geth.Logout() // to make sure that we start with empty account (which might get populated during previous tests)
+	// to make sure that we start with empty account (which might get populated during previous tests)
+	if err = geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	keyStore, err := geth.NodeManagerInstance().AccountKeyStore()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// create an account
@@ -148,7 +151,7 @@ func TestAccountsCreateChildAccount(t *testing.T) {
 	}
 
 	// obtain decrypted key, and make sure that extended key (which will be used as root for sub-accounts) is present
-	account, key, err := keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
+	_, key, err := keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
 	if err != nil {
 		t.Errorf("can not obtain decrypted account key: %v", err)
 		return
@@ -174,7 +177,7 @@ func TestAccountsCreateChildAccount(t *testing.T) {
 
 	// try to create sub-account with wrong password
 	_, _, err = geth.CreateChildAccount("", "wrong password")
-	if !reflect.DeepEqual(err, errors.New("cannot retreive a valid key for a given account: could not decrypt key with given passphrase")) {
+	if !reflect.DeepEqual(err, errors.New("cannot retrieve a valid key for a given account: could not decrypt key with given passphrase")) {
 		t.Errorf("expected error is not returned (tried to create sub-account with wrong password): %v", err)
 		return
 	}
@@ -210,8 +213,7 @@ func TestAccountsCreateChildAccount(t *testing.T) {
 func TestAccountsRecoverAccount(t *testing.T) {
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	keyStore, _ := geth.NodeManagerInstance().AccountKeyStore()
@@ -261,7 +263,7 @@ func TestAccountsRecoverAccount(t *testing.T) {
 	}
 
 	// make sure that extended key exists and is imported ok too
-	account, key, err = keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
+	_, key, err = keyStore.AccountDecryptedKey(account, testConfig.Account1.Password)
 	if err != nil {
 		t.Errorf("can not obtain decrypted account key: %v", err)
 		return
@@ -304,8 +306,7 @@ func TestAccountSelect(t *testing.T) {
 
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// test to see if the account was injected in whisper
@@ -370,8 +371,7 @@ func TestAccountsLogout(t *testing.T) {
 
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	whisperService, err := geth.NodeManagerInstance().WhisperService()
@@ -401,8 +401,7 @@ func TestAccountsLogout(t *testing.T) {
 		t.Error("identity not injected into whisper")
 	}
 
-	err = geth.Logout()
+	if err = geth.Logout(); err != nil {
-	if err != nil {
 		t.Errorf("cannot logout: %v", err)
 	}
 
@@ -415,8 +414,7 @@ func TestAccountsLogout(t *testing.T) {
 func TestAccountsSelectedAccountOnNodeRestart(t *testing.T) {
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// we need to make sure that selected account is injected as identity into Whisper
@@ -483,8 +481,7 @@ func TestAccountsSelectedAccountOnNodeRestart(t *testing.T) {
 
 	// stop node (and all of its sub-protocols)
 	if err := geth.NodeManagerInstance().StopNode(); err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// make sure that account is still selected
@@ -499,8 +496,7 @@ func TestAccountsSelectedAccountOnNodeRestart(t *testing.T) {
 
 	// resume node
 	if err := geth.NodeManagerInstance().ResumeNode(); err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// re-check selected account (account2 MUST be selected)
@@ -529,11 +525,12 @@ func TestAccountsSelectedAccountOnNodeRestart(t *testing.T) {
 func TestAccountsNodeRestartWithNoSelectedAccount(t *testing.T) {
 	err := geth.PrepareTestNode()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
-	geth.Logout()
+	if err = geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	// we need to make sure that selected account is injected as identity into Whisper
 	whisperService, err := geth.NodeManagerInstance().WhisperService()
@@ -562,8 +559,7 @@ func TestAccountsNodeRestartWithNoSelectedAccount(t *testing.T) {
 
 	// stop node (and all of its sub-protocols)
 	if err := geth.NodeManagerInstance().StopNode(); err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// make sure that no account is selected
@@ -574,8 +570,7 @@ func TestAccountsNodeRestartWithNoSelectedAccount(t *testing.T) {
 
 	// resume node
 	if err := geth.NodeManagerInstance().ResumeNode(); err != nil {
-		t.Error(err)
+		t.Fatal(err)
-		return
 	}
 
 	// make sure that no account is selected

geth/jail/handlers.go

@@ -6,14 +6,58 @@ import (
 )
 
 const (
-	EventLocalStorageSet   = "local_storage.set"
+	// EventLocalStorageSet is triggered when set request is sent to local storage
+	EventLocalStorageSet = "local_storage.set"
+
+	// LocalStorageMaxDataLen is maximum length of data that you can store in local storage
 	LocalStorageMaxDataLen = 256
 )
 
+// registerHandlers augments and transforms a given jail cell's underlying VM,
+// by adding and replacing method handlers.
+func registerHandlers(jail *Jail, vm *otto.Otto, chatID string) (err error) {
+	jeth, err := vm.Get("jeth")
+	if err != nil {
+		return err
+	}
+	registerHandler := jeth.Object().Set
+
+	// register send handler
+	if err = registerHandler("send", makeSendHandler(jail, chatID)); err != nil {
+		return err
+	}
+
+	// register sendAsync handler
+	if err = registerHandler("sendAsync", makeSendHandler(jail, chatID)); err != nil {
+		return err
+	}
+
+	// register isConnected handler
+	if err = registerHandler("isConnected", makeJethIsConnectedHandler(jail)); err != nil {
+		return err
+	}
+
+	// define localStorage
+	if err = vm.Set("localStorage", struct{}{}); err != nil {
+		return
+	}
+
+	// register localStorage.set handler
+	localStorage, err := vm.Get("localStorage")
+	if err != nil {
+		return
+	}
+	if err = localStorage.Object().Set("set", makeLocalStorageSetHandler(chatID)); err != nil {
+		return
+	}
+
+	return nil
+}
+
 // makeSendHandler returns jeth.send() and jeth.sendAsync() handler
-func makeSendHandler(jail *Jail, chatId string) func(call otto.FunctionCall) (response otto.Value) {
+func makeSendHandler(jail *Jail, chatID string) func(call otto.FunctionCall) (response otto.Value) {
 	return func(call otto.FunctionCall) (response otto.Value) {
-		return jail.Send(chatId, call)
+		return jail.Send(chatID, call)
 	}
 }
 
@@ -30,7 +74,7 @@ func makeJethIsConnectedHandler(jail *Jail) func(call otto.FunctionCall) (respon
 			return newErrorResponse(call, -32603, err.Error(), nil)
 		}
 
-		if netListeningResult != true {
+		if !netListeningResult {
 			return newErrorResponse(call, -32603, geth.ErrInvalidGethNode.Error(), nil)
 		}
 
@@ -39,7 +83,7 @@ func makeJethIsConnectedHandler(jail *Jail) func(call otto.FunctionCall) (respon
 }
 
 // makeLocalStorageSetHandler returns localStorage.set() handler
-func makeLocalStorageSetHandler(chatId string) func(call otto.FunctionCall) (response otto.Value) {
+func makeLocalStorageSetHandler(chatID string) func(call otto.FunctionCall) (response otto.Value) {
 	return func(call otto.FunctionCall) otto.Value {
 		data := call.Argument(0).String()
 		if len(data) > LocalStorageMaxDataLen { // cap input string
@@ -49,7 +93,7 @@ func makeLocalStorageSetHandler(chatId string) func(call otto.FunctionCall) (res
 		geth.SendSignal(geth.SignalEnvelope{
 			Type: EventLocalStorageSet,
 			Event: geth.LocalStorageSetEvent{
-				ChatId: chatId,
+				ChatID: chatID,
 				Data:   data,
 			},
 		})

geth/jail/jail.go

@@ -16,13 +16,17 @@ import (
 )
 
 const (
+	// JailedRuntimeRequestTimeout seconds before jailed request times out
 	JailedRuntimeRequestTimeout = time.Second * 60
 )
 
+// errors
 var (
 	ErrInvalidJail = errors.New("jail environment is not properly initialized")
 )
 
+// Jail represents jailed environment inside of which we hold
+// multiple cells. Each cell is separate JavaScript VM.
 type Jail struct {
 	sync.RWMutex
 	client       *rpc.Client               // lazy inited on the first call
@@ -31,16 +35,18 @@ type Jail struct {
 	requestQueue *geth.JailedRequestQueue
 }
 
+// JailedRuntime represents single jail cell, which is JavaScript VM.
 type JailedRuntime struct {
 	id  string
 	vm  *otto.Otto
 	sem *semaphore.Semaphore
 }
 
-var Web3_JS = static.MustAsset("scripts/web3.js")
+var web3JS = static.MustAsset("scripts/web3.js")
 var jailInstance *Jail
 var once sync.Once
 
+// New returns singleton jail environment
 func New() *Jail {
 	once.Do(func() {
 		jailInstance = &Jail{
@@ -51,6 +57,7 @@ func New() *Jail {
 	return jailInstance
 }
 
+// Init allows to setup initial JavaScript to be loaded on each jail.Parse()
 func Init(js string) *Jail {
 	jailInstance = New() // singleton, we will always get the same reference
 	jailInstance.statusJS = js
@@ -58,10 +65,12 @@ func Init(js string) *Jail {
 	return jailInstance
 }
 
+// GetInstance returns singleton jail environment instance
 func GetInstance() *Jail {
 	return New() // singleton, we will always get the same reference
 }
 
+// NewJailedRuntime initializes and returns jail cell
 func NewJailedRuntime(id string) *JailedRuntime {
 	return &JailedRuntime{
 		id:  id,
@@ -70,7 +79,10 @@ func NewJailedRuntime(id string) *JailedRuntime {
 	}
 }
 
-func (jail *Jail) Parse(chatId string, js string) string {
+// Parse creates a new jail cell context, with the given chatID as identifier
+// New context executes provided JavaScript code, right after the initialization.
+func (jail *Jail) Parse(chatID string, js string) string {
+	var err error
 	if jail == nil {
 		return printError(ErrInvalidJail.Error())
 	}
@@ -78,25 +90,23 @@ func (jail *Jail) Parse(chatId string, js string) string {
 	jail.Lock()
 	defer jail.Unlock()
 
-	jail.cells[chatId] = NewJailedRuntime(chatId)
+	jail.cells[chatID] = NewJailedRuntime(chatID)
-	vm := jail.cells[chatId].vm
+	vm := jail.cells[chatID].vm
 
 	initJjs := jail.statusJS + ";"
-	_, err := vm.Run(initJjs)
+	if _, err = vm.Run(initJjs); err != nil {
+		return printError(err.Error())
+	}
 
-	// jeth and its handlers
+	// init jeth and its handlers
-	vm.Set("jeth", struct{}{})
+	if err = vm.Set("jeth", struct{}{}); err != nil {
-	jethObj, _ := vm.Get("jeth")
+		return printError(err.Error())
-	jethObj.Object().Set("send", makeSendHandler(jail, chatId))
+	}
-	jethObj.Object().Set("sendAsync", makeSendHandler(jail, chatId))
+	if err = registerHandlers(jail, vm, chatID); err != nil {
-	jethObj.Object().Set("isConnected", makeJethIsConnectedHandler(jail))
+		return printError(err.Error())
+	}
 
-	// localStorage and its handlers
+	jjs := string(web3JS) + `
-	vm.Set("localStorage", struct{}{})
-	localStorage, _ := vm.Get("localStorage")
-	localStorage.Object().Set("set", makeLocalStorageSetHandler(chatId))
-
-	jjs := string(Web3_JS) + `
 	var Web3 = require('web3');
 	var web3 = new Web3(jeth);
 	var Bignumber = require("bignumber.js");
@@ -104,24 +114,30 @@ func (jail *Jail) Parse(chatId string, js string) string {
             return new Bignumber(val);
         }
 	` + js + "; var catalog = JSON.stringify(_status_catalog);"
-	vm.Run(jjs)
+	if _, err = vm.Run(jjs); err != nil {
+		return printError(err.Error())
+	}
 
-	res, _ := vm.Get("catalog")
+	res, err := vm.Get("catalog")
+	if err != nil {
+		return printError(err.Error())
+	}
 
 	return printResult(res.String(), err)
 }
 
-func (jail *Jail) Call(chatId string, path string, args string) string {
+// Call executes given JavaScript function w/i a jail cell context identified by the chatID
+func (jail *Jail) Call(chatID string, path string, args string) string {
 	_, err := jail.RPCClient()
 	if err != nil {
 		return printError(err.Error())
 	}
 
 	jail.RLock()
-	cell, ok := jail.cells[chatId]
+	cell, ok := jail.cells[chatID]
 	if !ok {
 		jail.RUnlock()
-		return printError(fmt.Sprintf("Cell[%s] doesn't exist.", chatId))
+		return printError(fmt.Sprintf("Cell[%s] doesn't exist.", chatID))
 	}
 	jail.RUnlock()
 
@@ -131,7 +147,8 @@ func (jail *Jail) Call(chatId string, path string, args string) string {
 	return printResult(res.String(), err)
 }
 
-func (jail *Jail) GetVM(chatId string) (*otto.Otto, error) {
+// GetVM returns instance of Otto VM (which is persisted w/i jail cell) by chatID
+func (jail *Jail) GetVM(chatID string) (*otto.Otto, error) {
 	if jail == nil {
 		return nil, ErrInvalidJail
 	}
@@ -139,16 +156,17 @@ func (jail *Jail) GetVM(chatId string) (*otto.Otto, error) {
 	jail.RLock()
 	defer jail.RUnlock()
 
-	cell, ok := jail.cells[chatId]
+	cell, ok := jail.cells[chatID]
 	if !ok {
-		return nil, fmt.Errorf("Cell[%s] doesn't exist.", chatId)
+		return nil, fmt.Errorf("cell[%s] doesn't exist", chatID)
 	}
 
 	return cell.vm, nil
 }
 
 // Send will serialize the first argument, send it to the node and returns the response.
-func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Value) {
+// nolint: errcheck, unparam
+func (jail *Jail) Send(chatID string, call otto.FunctionCall) (response otto.Value) {
 	client, err := jail.RPCClient()
 	if err != nil {
 		return newErrorResponse(call, -32603, err.Error(), nil)
@@ -183,7 +201,7 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 	resps, _ := call.Otto.Object("new Array()")
 	for _, req := range reqs {
 		resp, _ := call.Otto.Object(`({"jsonrpc":"2.0"})`)
-		resp.Set("id", req.Id)
+		resp.Set("id", req.ID)
 		var result json.RawMessage
 
 		// execute directly w/o RPC call to node
@@ -191,7 +209,7 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 			txHash, err := requestQueue.ProcessSendTransactionRequest(call.Otto, req)
 			resp.Set("result", txHash.Hex())
 			if err != nil {
-				resp = newErrorResponse(call, -32603, err.Error(), &req.Id).Object()
+				resp = newErrorResponse(call, -32603, err.Error(), &req.ID).Object()
 			}
 			resps.Call("push", resp)
 			continue
@@ -200,7 +218,7 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 		// do extra request pre processing (persist message id)
 		// within function semaphore will be acquired and released,
 		// so that no more than one client (per cell) can enter
-		messageId, err := requestQueue.PreProcessRequest(call.Otto, req)
+		messageID, err := requestQueue.PreProcessRequest(call.Otto, req)
 		if err != nil {
 			return newErrorResponse(call, -32603, err.Error(), nil)
 		}
@@ -220,9 +238,9 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 				// raw message for some reason.
 				resp.Set("result", otto.NullValue())
 			} else {
-				resultVal, err := JSON.Call("parse", string(result))
+				resultVal, callErr := JSON.Call("parse", string(result))
-				if err != nil {
+				if callErr != nil {
-					resp = newErrorResponse(call, -32603, err.Error(), &req.Id).Object()
+					resp = newErrorResponse(call, -32603, callErr.Error(), &req.ID).Object()
 				} else {
 					resp.Set("result", resultVal)
 				}
@@ -233,12 +251,12 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 				"message": err.Error(),
 			})
 		default:
-			resp = newErrorResponse(call, -32603, err.Error(), &req.Id).Object()
+			resp = newErrorResponse(call, -32603, err.Error(), &req.ID).Object()
 		}
 		resps.Call("push", resp)
 
 		// do extra request post processing (setting back tx context)
-		requestQueue.PostProcessRequest(call.Otto, req, messageId)
+		requestQueue.PostProcessRequest(call.Otto, req, messageID)
 	}
 
 	// Return the responses either to the callback (if supplied)
@@ -255,6 +273,9 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 	return response
 }
 
+// RPCClient returns RPC client instance, creating it if necessary.
+// Returned instance is cached, so successive calls receive the same one.
+// nolint: dupl
 func (jail *Jail) RPCClient() (*rpc.Client, error) {
 	if jail == nil {
 		return nil, ErrInvalidJail
@@ -279,6 +300,9 @@ func (jail *Jail) RPCClient() (*rpc.Client, error) {
 	return jail.client, nil
 }
 
+// RequestQueue returns request queue instance, creating it if necessary.
+// Returned instance is cached, so successive calls receive the same one.
+// nolint: dupl
 func (jail *Jail) RequestQueue() (*geth.JailedRequestQueue, error) {
 	if jail == nil {
 		return nil, ErrInvalidJail
@@ -312,7 +336,7 @@ func newErrorResponse(call otto.FunctionCall, code int, msg string, id interface
 
 func newResultResponse(call otto.FunctionCall, result interface{}) otto.Value {
 	resp, _ := call.Otto.Object(`({"jsonrpc":"2.0"})`)
-	resp.Set("result", result)
+	resp.Set("result", result) // nolint: errcheck
 
 	return resp.Value()
 }

geth/jail/jail_test.go

@@ -24,7 +24,7 @@ const (
 	whisperMessage4  = `test message 4 ("" -> "", anon broadcast)`
 	whisperMessage5  = `test message 5 ("" -> K1, encrypted anon broadcast)`
 	whisperMessage6  = `test message 6 (K2 -> K1, signed+encrypted, to us)`
-	chatID           = "testChat"
+	testChatID       = "testChat"
 	statusJSFilePath = "testdata/status.js"
 	txSendFolder     = "testdata/tx-send/"
 )
@@ -54,17 +54,17 @@ func TestJailUnInited(t *testing.T) {
 	expectedError := errorWrapper(jail.ErrInvalidJail)
 
 	var jailInstance *jail.Jail
-	response := jailInstance.Parse(chatID, ``)
+	response := jailInstance.Parse(testChatID, ``)
 	if response != expectedError {
 		t.Errorf("error expected, but got: %v", response)
 	}
 
-	response = jailInstance.Call(chatID, `["commands", "testCommand"]`, `{"val": 12}`)
+	response = jailInstance.Call(testChatID, `["commands", "testCommand"]`, `{"val": 12}`)
 	if response != expectedError {
 		t.Errorf("error expected, but got: %v", response)
 	}
 
-	_, err := jailInstance.GetVM(chatID)
+	_, err := jailInstance.GetVM(testChatID)
 	if err != jail.ErrInvalidJail {
 		t.Errorf("error expected, but got: %v", err)
 	}
@@ -84,14 +84,14 @@ func TestJailUnInited(t *testing.T) {
 	_status_catalog.commands["testCommand"] = function (params) {
 		return params.val * params.val;
 	};`
-	response = jailInstance.Parse(chatID, statusJS)
+	response = jailInstance.Parse(testChatID, statusJS)
 	expectedResponse := `{"result": {"commands":{},"responses":{}}}`
 	if response != expectedResponse {
 		t.Errorf("unexpected response received: %v", response)
 	}
 
 	// however, we still expect issue voiced if somebody tries to execute code with Call
-	response = jailInstance.Call(chatID, `["commands", "testCommand"]`, `{"val": 12}`)
+	response = jailInstance.Call(testChatID, `["commands", "testCommand"]`, `{"val": 12}`)
 	if response != errorWrapper(geth.ErrInvalidGethNode) {
 		t.Errorf("error expected, but got: %v", response)
 	}
@@ -102,7 +102,7 @@ func TestJailUnInited(t *testing.T) {
 		t.Error(err)
 		return
 	}
-	response = jailInstance.Call(chatID, `["commands", "testCommand"]`, `{"val": 12}`)
+	response = jailInstance.Call(testChatID, `["commands", "testCommand"]`, `{"val": 12}`)
 	expectedResponse = `{"result": 144}`
 	if response != expectedResponse {
 		t.Errorf("expected response is not returned: expected %s, got %s", expectedResponse, response)
@@ -153,18 +153,18 @@ func TestJailFunctionCall(t *testing.T) {
 	_status_catalog.commands["testCommand"] = function (params) {
 		return params.val * params.val;
 	};`
-	jailInstance.Parse(chatID, statusJS)
+	jailInstance.Parse(testChatID, statusJS)
 
 	// call with wrong chat id
-	response := jailInstance.Call("chatIdNonExistent", "", "")
+	response := jailInstance.Call("chatIDNonExistent", "", "")
-	expectedError := `{"error":"Cell[chatIdNonExistent] doesn't exist."}`
+	expectedError := `{"error":"Cell[chatIDNonExistent] doesn't exist."}`
 	if response != expectedError {
 		t.Errorf("expected error is not returned: expected %s, got %s", expectedError, response)
 		return
 	}
 
 	// call extraFunc()
-	response = jailInstance.Call(chatID, `["commands", "testCommand"]`, `{"val": 12}`)
+	response = jailInstance.Call(testChatID, `["commands", "testCommand"]`, `{"val": 12}`)
 	expectedResponse := `{"result": 144}`
 	if response != expectedResponse {
 		t.Errorf("expected response is not returned: expected %s, got %s", expectedResponse, response)
@@ -183,10 +183,10 @@ func TestJailRPCSend(t *testing.T) {
 
 	// load Status JS and add test command to it
 	statusJS := geth.LoadFromFile(statusJSFilePath)
-	jailInstance.Parse(chatID, statusJS)
+	jailInstance.Parse(testChatID, statusJS)
 
 	// obtain VM for a given chat (to send custom JS to jailed version of Send())
-	vm, err := jailInstance.GetVM(chatID)
+	vm, err := jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("cannot get VM: %v", err)
 		return
@@ -276,7 +276,7 @@ func TestJailSendQueuedTransaction(t *testing.T) {
 
 			var txHash common.Hash
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
 			} else {
 				t.Logf("Transaction complete: https://testnet.etherscan.io/tx/%s", txHash.Hex())
 			}
@@ -332,7 +332,7 @@ func TestJailSendQueuedTransaction(t *testing.T) {
 				{
 					`["commands", "getBalance"]`,
 					`{"address": "` + testConfig.Account1.Address + `"}`,
-					`{"result": {"context":{},"result":{"balance":42}}}`, // note emtpy (but present) context!
+					`{"result": {"context":{},"result":{"balance":42}}}`, // note empty (but present) context!
 				},
 			},
 		},
@@ -350,7 +350,7 @@ func TestJailSendQueuedTransaction(t *testing.T) {
 				{
 					`["commands", "getBalance"]`,
 					`{"address": "` + testConfig.Account1.Address + `"}`,
-					`{"result": {"balance":42}}`, // note emtpy context!
+					`{"result": {"balance":42}}`, // note empty context!
 				},
 			},
 		},
@@ -377,14 +377,14 @@ func TestJailSendQueuedTransaction(t *testing.T) {
 	for _, test := range tests {
 		jailInstance := jail.Init(geth.LoadFromFile(txSendFolder + test.file))
 		geth.PanicAfter(60*time.Second, txCompletedSuccessfully, test.name)
-		jailInstance.Parse(chatID, ``)
+		jailInstance.Parse(testChatID, ``)
 
 		requireMessageId = test.requireMessageId
 
 		for _, command := range test.commands {
 			go func(jail *jail.Jail, test testCase, command testCommand) {
 				t.Logf("->%s: %s", test.name, command.command)
-				response := jail.Call(chatID, command.command, command.params)
+				response := jail.Call(testChatID, command.command, command.params)
 				var txHash common.Hash
 				if command.command == `["commands", "send"]` {
 					txHash = <-txHashes
@@ -432,16 +432,16 @@ func TestJailGetVM(t *testing.T) {
 
 	jailInstance := jail.Init("")
 
-	expectedError := `Cell[nonExistentChat] doesn't exist.`
+	expectedError := `cell[nonExistentChat] doesn't exist`
 	_, err = jailInstance.GetVM("nonExistentChat")
 	if err == nil || err.Error() != expectedError {
 		t.Error("expected error, but call succeeded")
 	}
 
 	// now let's create VM..
-	jailInstance.Parse(chatID, ``)
+	jailInstance.Parse(testChatID, ``)
 	// ..and see if VM becomes available
-	_, err = jailInstance.GetVM(chatID)
+	_, err = jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
@@ -455,10 +455,10 @@ func TestIsConnected(t *testing.T) {
 	}
 
 	jailInstance := jail.Init("")
-	jailInstance.Parse(chatID, "")
+	jailInstance.Parse(testChatID, "")
 
 	// obtain VM for a given chat (to send custom JS to jailed version of Send())
-	vm, err := jailInstance.GetVM(chatID)
+	vm, err := jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("cannot get VM: %v", err)
 		return
@@ -500,10 +500,10 @@ func TestLocalStorageSet(t *testing.T) {
 	}
 
 	jailInstance := jail.Init("")
-	jailInstance.Parse(chatID, "")
+	jailInstance.Parse(testChatID, "")
 
 	// obtain VM for a given chat (to send custom JS to jailed version of Send())
-	vm, err := jailInstance.GetVM(chatID)
+	vm, err := jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("cannot get VM: %v", err)
 		return
@@ -522,13 +522,13 @@ func TestLocalStorageSet(t *testing.T) {
 		}
 		if envelope.Type == jail.EventLocalStorageSet {
 			event := envelope.Event.(map[string]interface{})
-			chatId, ok := event["chat_id"].(string)
+			chatID, ok := event["chat_id"].(string)
 			if !ok {
 				t.Error("Chat id is required, but not found")
 				return
 			}
-			if chatId != chatID {
+			if chatID != testChatID {
-				t.Errorf("incorrect chat id: expected %q, got: %q", chatID, chatId)
+				t.Errorf("incorrect chat id: expected %q, got: %q", testChatID, chatID)
 				return
 			}
 
@@ -592,10 +592,10 @@ func TestContractDeployment(t *testing.T) {
 	}
 
 	jailInstance := jail.Init("")
-	jailInstance.Parse(chatID, "")
+	jailInstance.Parse(testChatID, "")
 
 	// obtain VM for a given chat (to send custom JS to jailed version of Send())
-	vm, err := jailInstance.GetVM(chatID)
+	vm, err := jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("cannot get VM: %v", err)
 		return
@@ -607,32 +607,11 @@ func TestContractDeployment(t *testing.T) {
 
 	// replace transaction notification handler
 	var txHash common.Hash
-	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
+	handler, err := geth.MakeTestCompleteTxHandler(t, &txHash, completeQueuedTransaction)
-		var envelope geth.SignalEnvelope
+	if err != nil {
-		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
+		t.Fatal(err)
-			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
+	}
-			return
+	geth.SetDefaultNodeNotificationHandler(handler)
-		}
-		if envelope.Type == geth.EventTransactionQueued {
-			event := envelope.Event.(map[string]interface{})
-
-			t.Logf("Transaction queued (will be completed shortly): {id: %s}\n", event["id"].(string))
-
-			if err := geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot select account: %v", testConfig.Account1.Address)
-				return
-			}
-
-			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
-				return
-			} else {
-				t.Logf("Contract created: https://testnet.etherscan.io/tx/%s", txHash.Hex())
-			}
-
-			close(completeQueuedTransaction) // so that timeout is aborted
-		}
-	})
 
 	_, err = vm.Run(`
 		var responseValue = null;
@@ -682,10 +661,10 @@ func TestGasEstimation(t *testing.T) {
 	}
 
 	jailInstance := jail.Init("")
-	jailInstance.Parse(chatID, "")
+	jailInstance.Parse(testChatID, "")
 
 	// obtain VM for a given chat (to send custom JS to jailed version of Send())
-	vm, err := jailInstance.GetVM(chatID)
+	vm, err := jailInstance.GetVM(testChatID)
 	if err != nil {
 		t.Errorf("cannot get VM: %v", err)
 		return
@@ -697,32 +676,11 @@ func TestGasEstimation(t *testing.T) {
 
 	// replace transaction notification handler
 	var txHash common.Hash
-	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
+	handler, err := geth.MakeTestCompleteTxHandler(t, &txHash, completeQueuedTransaction)
-		var envelope geth.SignalEnvelope
+	if err != nil {
-		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
+		t.Fatal(err)
-			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
+	}
-			return
+	geth.SetDefaultNodeNotificationHandler(handler)
-		}
-		if envelope.Type == geth.EventTransactionQueued {
-			event := envelope.Event.(map[string]interface{})
-
-			t.Logf("Transaction queued (will be completed immediately): {id: %s}\n", event["id"].(string))
-
-			if err := geth.SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot select account: %v", testConfig.Account1.Address)
-				return
-			}
-
-			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
-				return
-			} else {
-				t.Logf("Contract created: https://testnet.etherscan.io/tx/%s", txHash.Hex())
-			}
-
-			close(completeQueuedTransaction) // so that timeout is aborted
-		}
-	})
 
 	_, err = vm.Run(`
 		var responseValue = null;
@@ -783,7 +741,9 @@ func TestJailWhisper(t *testing.T) {
 	}
 	accountKey1Hex := common.ToHex(crypto.FromECDSAPub(&accountKey1.PrivateKey.PublicKey))
 
-	whisperService.AddKeyPair(accountKey1.PrivateKey)
+	if _, err := whisperService.AddKeyPair(accountKey1.PrivateKey); err != nil {
+		t.Fatalf("identity not injected: %v", accountKey1Hex)
+	}
 	if ok, err := whisperAPI.HasKeyPair(accountKey1Hex); err != nil || !ok {
 		t.Fatalf("identity not injected: %v", accountKey1Hex)
 	}
@@ -795,7 +755,9 @@ func TestJailWhisper(t *testing.T) {
 	}
 	accountKey2Hex := common.ToHex(crypto.FromECDSAPub(&accountKey2.PrivateKey.PublicKey))
 
-	whisperService.AddKeyPair(accountKey2.PrivateKey)
+	if _, err := whisperService.AddKeyPair(accountKey2.PrivateKey); err != nil {
+		t.Fatalf("identity not injected: %v", accountKey2Hex)
+	}
 	if ok, err := whisperAPI.HasKeyPair(accountKey2Hex); err != nil || !ok {
 		t.Fatalf("identity not injected: %v", accountKey2Hex)
 	}

geth/node.go

@@ -31,15 +31,18 @@ import (
 )
 
 const (
+	// EventNodeStarted is triggered when underlying node is fully started
 	EventNodeStarted = "node.started"
+
+	// EventNodeCrashed is triggered when node crashes
 	EventNodeCrashed = "node.crashed"
 )
 
 // node-related errors
 var (
-	ErrEthServiceRegistrationFailure = errors.New("failed to register the Ethereum service")
+	ErrEthServiceRegistrationFailure     = errors.New("failed to register the Ethereum service")
-	ErrSshServiceRegistrationFailure = errors.New("failed to register the Whisper service")
+	ErrWhisperServiceRegistrationFailure = errors.New("failed to register the Whisper service")
-	ErrLightEthRegistrationFailure   = errors.New("failed to register the LES service")
+	ErrLightEthRegistrationFailure       = errors.New("failed to register the LES service")
 )
 
 // Node represents running node (serves as a wrapper around P2P node)
@@ -139,7 +142,7 @@ func MakeNode(config *params.NodeConfig) *Node {
 
 	// start Whisper service
 	if err := activateShhService(stack, config); err != nil {
-		Fatalf(fmt.Errorf("%v: %v", ErrSshServiceRegistrationFailure, err))
+		Fatalf(fmt.Errorf("%v: %v", ErrWhisperServiceRegistrationFailure, err))
 	}
 
 	return &Node{
@@ -168,7 +171,7 @@ func activateEthService(stack *node.Node, config *params.NodeConfig) error {
 	ethConf := eth.DefaultConfig
 	ethConf.Genesis = genesis
 	ethConf.SyncMode = downloader.LightSync
-	ethConf.NetworkId = config.NetworkId
+	ethConf.NetworkId = config.NetworkID
 	ethConf.DatabaseCache = config.LightEthConfig.DatabaseCache
 	ethConf.MaxPeers = config.MaxPeers
 	ethConf.DatabaseHandles = makeDatabaseHandles()
@@ -213,11 +216,8 @@ func activateShhService(stack *node.Node, config *params.NodeConfig) error {
 
 		return whisperService, nil
 	}
-	if err := stack.Register(serviceConstructor); err != nil {
-		return err
-	}
 
-	return nil
+	return stack.Register(serviceConstructor)
 }
 
 // makeIPCPath returns IPC-RPC filename
@@ -297,6 +297,9 @@ func makeBootstrapNodesV5() []*discv5.Node {
 	return bootstapNodes
 }
 
+// Fatalf is used to halt the execution.
+// When called the function prints stack end exits.
+// Failure is logged into both StdErr and StdOut.
 func Fatalf(reason interface{}, args ...interface{}) {
 	// decide on output stream
 	w := io.MultiWriter(os.Stdout, os.Stderr)

geth/node_manager.go

@@ -44,6 +44,7 @@ type NodeServiceStack struct {
 	jailedRequestQueue *JailedRequestQueue // bridge via which jail notifies node of incoming requests
 }
 
+// errors
 var (
 	ErrInvalidGethNode             = errors.New("no running geth node detected")
 	ErrInvalidAccountManager       = errors.New("could not retrieve account manager")
@@ -162,7 +163,7 @@ func (m *NodeManager) StartNode() {
 		defer signal.Stop(sigc)
 		<-sigc
 		log.Info("Got interrupt, shutting down...")
-		go m.node.geth.Stop()
+		go m.node.geth.Stop() // nolint: errcheck
 		for i := 3; i > 0; i-- {
 			<-sigc
 			if i > 1 {
@@ -192,7 +193,9 @@ func (m *NodeManager) RestartNode() error {
 		return ErrInvalidGethNode
 	}
 
-	m.StopNode()
+	if err := m.StopNode(); err != nil {
+		return err
+	}
 	m.RunNode()
 	m.WaitNodeStarted()
 
@@ -208,12 +211,7 @@ func (m *NodeManager) ResumeNode() error {
 	m.RunNode()
 	m.WaitNodeStarted()
 
-	// re-select the previously selected account
+	return ReSelectAccount()
-	if err := ReSelectAccount(); err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // ResetChainData purges chain data (by removing data directory). Safe to apply on running P2P node.
@@ -235,13 +233,10 @@ func (m *NodeManager) ResetChainData() error {
 	}
 	log.Info("chaindata removed", "dir", chainDataDir)
 
-	if err := m.ResumeNode(); err != nil {
+	return m.ResumeNode()
-		return err
-	}
-
-	return nil
 }
 
+// StartNodeRPCServer starts HTTP RPC server
 func (m *NodeManager) StartNodeRPCServer() (bool, error) {
 	if m == nil || !m.NodeInited() {
 		return false, ErrInvalidGethNode
@@ -258,7 +253,7 @@ func (m *NodeManager) StartNodeRPCServer() (bool, error) {
 	return m.api.StartRPC(&config.HTTPHost, &config.HTTPPort, &cors, &modules)
 }
 
-// StopNodeRPCServer stops HTTP RPC service attached to node
+// StopNodeRPCServer stops HTTP RPC server attached to node
 func (m *NodeManager) StopNodeRPCServer() (bool, error) {
 	if m == nil || !m.NodeInited() {
 		return false, ErrInvalidGethNode
@@ -323,6 +318,7 @@ func (m *NodeManager) AccountKeyStore() (*keystore.KeyStore, error) {
 }
 
 // LightEthereumService exposes LES
+// nolint: dupl
 func (m *NodeManager) LightEthereumService() (*les.LightEthereum, error) {
 	if m == nil || !m.NodeInited() {
 		return nil, ErrInvalidGethNode
@@ -336,6 +332,7 @@ func (m *NodeManager) LightEthereumService() (*les.LightEthereum, error) {
 }
 
 // WhisperService exposes Whisper service
+// nolint: dupl
 func (m *NodeManager) WhisperService() (*whisper.Whisper, error) {
 	if m == nil || !m.NodeInited() {
 		return nil, ErrInvalidGethNode
@@ -349,6 +346,7 @@ func (m *NodeManager) WhisperService() (*whisper.Whisper, error) {
 }
 
 // RPCClient exposes Geth's RPC client
+// nolint: dupl
 func (m *NodeManager) RPCClient() (*rpc.Client, error) {
 	if m == nil || !m.NodeInited() {
 		return nil, ErrInvalidGethNode
@@ -416,10 +414,11 @@ func (m *NodeManager) onNodeStarted() {
 // PopulateStaticPeers connects current node with our publicly available LES/SHH/Swarm cluster
 func (m *NodeManager) PopulateStaticPeers() {
 	for _, enode := range params.TestnetBootnodes {
-		m.AddPeer(enode)
+		m.AddPeer(enode) // nolint: errcheck
 	}
 }
 
+// Hex dumps address of a given extended key as hex string
 func (k *SelectedExtKey) Hex() string {
 	if k == nil {
 		return "0x0"

geth/params/config.go

@@ -28,9 +28,10 @@ func init() {
 	}
 }
 
+// errors
 var (
 	ErrMissingDataDir            = errors.New("missing required 'DataDir' parameter")
-	ErrMissingNetworkId          = errors.New("missing required 'NetworkId' parameter")
+	ErrMissingNetworkID          = errors.New("missing required 'NetworkID' parameter")
 	ErrEmptyPasswordFile         = errors.New("password file cannot be empty")
 	ErrEmptyIdentityFile         = errors.New("identity file cannot be empty")
 	ErrEmptyAuthorizationKeyFile = errors.New("authorization key file cannot be empty")
@@ -49,6 +50,7 @@ type LightEthConfig struct {
 	DatabaseCache int
 }
 
+// FirebaseConfig holds FCM-related configuration
 type FirebaseConfig struct {
 	// AuthorizationKeyFile file path that contains FCM authorization key
 	AuthorizationKeyFile string
@@ -111,8 +113,8 @@ type NodeConfig struct {
 	// TestNet flag whether given configuration describes a test or mainnet
 	TestNet bool
 
-	// NetworkId sets network to use for selecting peers to connect to
+	// NetworkID sets network to use for selecting peers to connect to
-	NetworkId uint64
+	NetworkID uint64 `json:"NetworkId,"`
 
 	// DataDir is the file system folder the node should use for any data storage needs.
 	DataDir string
@@ -192,9 +194,9 @@ type NodeConfig struct {
 }
 
 // NewNodeConfig creates new node configuration object
-func NewNodeConfig(dataDir string, networkId uint64) (*NodeConfig, error) {
+func NewNodeConfig(dataDir string, networkID uint64) (*NodeConfig, error) {
 	nodeConfig := &NodeConfig{
-		NetworkId:       networkId,
+		NetworkID:       networkID,
 		DataDir:         dataDir,
 		Name:            ClientIdentifier,
 		Version:         Version,
@@ -259,7 +261,7 @@ func (c *NodeConfig) populateDirs() error {
 // populateChainConfig does necessary adjustments to config object (depending on network node will be runnin on)
 func (c *NodeConfig) populateGenesis() error {
 	c.TestNet = false
-	if c.NetworkId == TestNetworkId {
+	if c.NetworkID == TestNetworkID {
 		c.TestNet = true
 	}
 
@@ -307,8 +309,8 @@ func LoadNodeConfig(configJSON string) (*NodeConfig, error) {
 		return nil, ErrMissingDataDir
 	}
 
-	if nodeConfig.NetworkId <= 0 {
+	if nodeConfig.NetworkID <= 0 {
-		return nil, ErrMissingNetworkId
+		return nil, ErrMissingNetworkID
 	}
 
 	return nodeConfig, nil

geth/params/config_test.go

@@ -56,8 +56,8 @@ var loadConfigTestCases = []struct {
 			"DataDir": "$TMPDIR"
 		}`,
 		func(t *testing.T, dataDir string, nodeConfig *params.NodeConfig, err error) {
-			if err != params.ErrMissingNetworkId {
+			if err != params.ErrMissingNetworkID {
-				t.Fatalf("expected error not thrown, expected: %v, thrown: %v", params.ErrMissingNetworkId, err)
+				t.Fatalf("expected error not thrown, expected: %v, thrown: %v", params.ErrMissingNetworkID, err)
 			}
 		},
 	},
@@ -142,7 +142,7 @@ var loadConfigTestCases = []struct {
 				t.Fatalf("unexpected error: %v", err)
 			}
 
-			if nodeConfig.NetworkId != 3 {
+			if nodeConfig.NetworkID != 3 {
 				t.Fatal("wrong NetworkId")
 			}
 
@@ -162,11 +162,11 @@ var loadConfigTestCases = []struct {
 				t.Fatal("wrong WSPort")
 			}
 
-			if nodeConfig.WSEnabled != false {
+			if nodeConfig.WSEnabled {
 				t.Fatal("wrong WSEnabled")
 			}
 
-			if nodeConfig.IPCEnabled != true {
+			if !nodeConfig.IPCEnabled {
 				t.Fatal("wrong IPCEnabled")
 			}
 			if nodeConfig.LightEthConfig.DatabaseCache != 64 {
@@ -254,7 +254,7 @@ var loadConfigTestCases = []struct {
 			if chainConfig.DAOForkBlock.Cmp(gethparams.MainNetDAOForkBlock) != 0 {
 				t.Fatal("invalid chainConfig.DAOForkBlock")
 			}
-			if chainConfig.DAOForkSupport != true {
+			if !chainConfig.DAOForkSupport {
 				t.Fatal("invalid chainConfig.DAOForkSupport")
 			}
 			if chainConfig.EIP150Block.Cmp(gethparams.MainNetHomesteadGasRepriceBlock) != 0 {
@@ -292,8 +292,8 @@ var loadConfigTestCases = []struct {
 			}
 
 			networkId := uint64(311)
-			if nodeConfig.NetworkId != networkId {
+			if nodeConfig.NetworkID != networkId {
-				t.Fatalf("unexpected NetworkId, expected: %v, got: %v", networkId, nodeConfig.NetworkId)
+				t.Fatalf("unexpected NetworkID, expected: %v, got: %v", networkId, nodeConfig.NetworkID)
 			}
 		},
 	},
@@ -304,7 +304,7 @@ func TestLoadNodeConfig(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer os.RemoveAll(tmpDir)
+	defer os.RemoveAll(tmpDir) // nolint: errcheck
 
 	for _, testCase := range loadConfigTestCases {
 		t.Log("test: " + testCase.name)
@@ -320,7 +320,7 @@ func TestConfigWriteRead(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		defer os.RemoveAll(tmpDir)
+		defer os.RemoveAll(tmpDir) // nolint: errcheck
 
 		nodeConfig, err := params.NewNodeConfig(tmpDir, networkId)
 		if err != nil {
@@ -345,6 +345,6 @@ func TestConfigWriteRead(t *testing.T) {
 		}
 	}
 
-	configReadWrite(params.TestNetworkId, "testdata/config.testnet.json")
+	configReadWrite(params.TestNetworkID, "testdata/config.testnet.json")
-	configReadWrite(params.MainNetworkId, "testdata/config.mainnet.json")
+	configReadWrite(params.MainNetworkID, "testdata/config.mainnet.json")
 }

geth/params/defaults.go

@@ -69,9 +69,9 @@ const (
 	// FirebaseNotificationTriggerURL is URL where FCM notification requests are sent to
 	FirebaseNotificationTriggerURL = "https://fcm.googleapis.com/fcm/send"
 
-	// MainNetworkId is id of the main network
+	// MainNetworkID is id of the main network
-	MainNetworkId = 1
+	MainNetworkID = 1
 
-	// TestNetworkId is id of a test network
+	// TestNetworkID is id of a test network
-	TestNetworkId = 3
+	TestNetworkID = 3
 )

geth/params/logger_test.go

@@ -18,7 +18,7 @@ func TestLogger(t *testing.T) {
 	}
 	//defer os.RemoveAll(tmpDir)
 
-	nodeConfig, err := params.NewNodeConfig(tmpDir, params.TestNetworkId)
+	nodeConfig, err := params.NewNodeConfig(tmpDir, params.TestNetworkID)
 	if err != nil {
 		t.Fatal("cannot create config object")
 	}
@@ -74,7 +74,9 @@ func TestLogger(t *testing.T) {
 	validateLogText(`msg="logged INFO log level message"`) // debug level message is NOT logged
 
 	// stop logger and see if os.Stderr and gethlog continue functioning
-	nodeLogger.Stop()
+	if err = nodeLogger.Stop(); err != nil {
+		t.Fatal(err)
+	}
 
 	log.Info("logging message: this message happens after custom logger has been stopped")
 }

geth/params/version.go

@@ -5,10 +5,17 @@ import (
 )
 
 const (
-	VersionMajor = 0          // Major version component of the current release
+	// VersionMajor is a major version component of the current release
-	VersionMinor = 9          // Minor version component of the current release
+	VersionMajor = 0
-	VersionPatch = 7          // Patch version component of the current release
+
-	VersionMeta  = "unstable" // Version metadata to append to the version string
+	// VersionMinor is a minor version component of the current release
+	VersionMinor = 9
+
+	// VersionPatch is a patch version component of the current release
+	VersionPatch = 7
+
+	// VersionMeta is metadata to append to the version string
+	VersionMeta = "unstable"
 )
 
 // Version exposes string representation of program version.

geth/txqueue.go

@@ -12,12 +12,24 @@ import (
 )
 
 const (
+	// EventTransactionQueued is triggered whan send transaction request is queued
 	EventTransactionQueued = "transaction.queued"
-	EventTransactionFailed = "transaction.failed"
-	SendTransactionRequest = "eth_sendTransaction"
-	MessageIdKey           = "message_id"
 
-	// tx error codes
+	// EventTransactionFailed is triggered when send transaction request fails
+	EventTransactionFailed = "transaction.failed"
+
+	// SendTransactionRequest is triggered on send transaction request
+	SendTransactionRequest = "eth_sendTransaction"
+
+	// MessageIDKey is a key for message ID
+	// This ID is required to track from which chat a given send transaction request is coming.
+	MessageIDKey = contextKey("message_id")
+)
+
+type contextKey string // in order to make sure that our context key does not collide with keys from other packages
+
+// Send transaction response codes
+const (
 	SendTransactionNoErrorCode        = "0"
 	SendTransactionDefaultErrorCode   = "1"
 	SendTransactionPasswordErrorCode  = "2"
@@ -29,9 +41,9 @@ func onSendTransactionRequest(queuedTx status.QueuedTx) {
 	SendSignal(SignalEnvelope{
 		Type: EventTransactionQueued,
 		Event: SendTransactionEvent{
-			Id:        string(queuedTx.Id),
+			ID:        string(queuedTx.ID),
 			Args:      queuedTx.Args,
-			MessageId: messageIdFromContext(queuedTx.Context),
+			MessageID: messageIDFromContext(queuedTx.Context),
 		},
 	})
 }
@@ -50,9 +62,9 @@ func onSendTransactionReturn(queuedTx *status.QueuedTx, err error) {
 	SendSignal(SignalEnvelope{
 		Type: EventTransactionFailed,
 		Event: ReturnSendTransactionEvent{
-			Id:           string(queuedTx.Id),
+			ID:           string(queuedTx.ID),
 			Args:         queuedTx.Args,
-			MessageId:    messageIdFromContext(queuedTx.Context),
+			MessageID:    messageIDFromContext(queuedTx.Context),
 			ErrorMessage: err.Error(),
 			ErrorCode:    sendTransactionErrorCode(err),
 		},
@@ -76,6 +88,7 @@ func sendTransactionErrorCode(err error) string {
 	}
 }
 
+// CompleteTransaction instructs backend to complete sending of a given transaction
 func CompleteTransaction(id, password string) (common.Hash, error) {
 	lightEthereum, err := NodeManagerInstance().LightEthereumService()
 	if err != nil {
@@ -87,13 +100,14 @@ func CompleteTransaction(id, password string) (common.Hash, error) {
 	ctx := context.Background()
 	ctx = context.WithValue(ctx, status.SelectedAccountKey, NodeManagerInstance().SelectedAccount.Hex())
 
-	return backend.CompleteQueuedTransaction(ctx, status.QueuedTxId(id), password)
+	return backend.CompleteQueuedTransaction(ctx, status.QueuedTxID(id), password)
 }
 
+// CompleteTransactions instructs backend to complete sending of multiple transactions
 func CompleteTransactions(ids, password string) map[string]RawCompleteTransactionResult {
 	results := make(map[string]RawCompleteTransactionResult)
 
-	parsedIds, err := parseJSONArray(ids)
+	parsedIDs, err := parseJSONArray(ids)
 	if err != nil {
 		results["none"] = RawCompleteTransactionResult{
 			Error: err,
@@ -101,9 +115,9 @@ func CompleteTransactions(ids, password string) map[string]RawCompleteTransactio
 		return results
 	}
 
-	for _, txId := range parsedIds {
+	for _, txID := range parsedIDs {
-		txHash, txErr := CompleteTransaction(txId, password)
+		txHash, txErr := CompleteTransaction(txID, password)
-		results[txId] = RawCompleteTransactionResult{
+		results[txID] = RawCompleteTransactionResult{
 			Hash:  txHash,
 			Error: txErr,
 		}
@@ -112,6 +126,7 @@ func CompleteTransactions(ids, password string) map[string]RawCompleteTransactio
 	return results
 }
 
+// DiscardTransaction discards a given transaction from transaction queue
 func DiscardTransaction(id string) error {
 	lightEthereum, err := NodeManagerInstance().LightEthereumService()
 	if err != nil {
@@ -120,14 +135,15 @@ func DiscardTransaction(id string) error {
 
 	backend := lightEthereum.StatusBackend
 
-	return backend.DiscardQueuedTransaction(status.QueuedTxId(id))
+	return backend.DiscardQueuedTransaction(status.QueuedTxID(id))
 }
 
+// DiscardTransactions discards given multiple transactions from transaction queue
 func DiscardTransactions(ids string) map[string]RawDiscardTransactionResult {
-	var parsedIds []string
+	var parsedIDs []string
 	results := make(map[string]RawDiscardTransactionResult)
 
-	parsedIds, err := parseJSONArray(ids)
+	parsedIDs, err := parseJSONArray(ids)
 	if err != nil {
 		results["none"] = RawDiscardTransactionResult{
 			Error: err,
@@ -135,10 +151,10 @@ func DiscardTransactions(ids string) map[string]RawDiscardTransactionResult {
 		return results
 	}
 
-	for _, txId := range parsedIds {
+	for _, txID := range parsedIDs {
-		err := DiscardTransaction(txId)
+		err := DiscardTransaction(txID)
 		if err != nil {
-			results[txId] = RawDiscardTransactionResult{
+			results[txID] = RawDiscardTransactionResult{
 				Error: err,
 			}
 		}
@@ -147,40 +163,50 @@ func DiscardTransactions(ids string) map[string]RawDiscardTransactionResult {
 	return results
 }
 
-func messageIdFromContext(ctx context.Context) string {
+func messageIDFromContext(ctx context.Context) string {
 	if ctx == nil {
 		return ""
 	}
-	if messageId, ok := ctx.Value(MessageIdKey).(string); ok {
+	if messageID, ok := ctx.Value(MessageIDKey).(string); ok {
-		return messageId
+		return messageID
 	}
 
 	return ""
 }
 
+// JailedRequestQueue is used for allowing request pre and post processing.
+// Such processing may include validation, injection of params (like message ID) etc
 type JailedRequestQueue struct{}
 
+// NewJailedRequestsQueue returns new instance of request queue
 func NewJailedRequestsQueue() *JailedRequestQueue {
 	return &JailedRequestQueue{}
 }
 
+// PreProcessRequest pre-processes a given RPC call to a given Otto VM
 func (q *JailedRequestQueue) PreProcessRequest(vm *otto.Otto, req RPCCall) (string, error) {
-	messageId := currentMessageId(vm.Context())
+	messageID := currentMessageID(vm.Context())
 
-	return messageId, nil
+	return messageID, nil
 }
 
-func (q *JailedRequestQueue) PostProcessRequest(vm *otto.Otto, req RPCCall, messageId string) {
+// PostProcessRequest post-processes a given RPC call to a given Otto VM
-	if len(messageId) > 0 {
+func (q *JailedRequestQueue) PostProcessRequest(vm *otto.Otto, req RPCCall, messageID string) {
-		vm.Call("addContext", nil, messageId, MessageIdKey, messageId)
+	if len(messageID) > 0 {
+		vm.Call("addContext", nil, messageID, MessageIDKey, messageID) // nolint: errcheck
 	}
 
 	// set extra markers for queued transaction requests
 	if req.Method == SendTransactionRequest {
-		vm.Call("addContext", nil, messageId, SendTransactionRequest, true)
+		vm.Call("addContext", nil, messageID, SendTransactionRequest, true) // nolint: errcheck
 	}
 }
 
+// ProcessSendTransactionRequest processes send transaction request.
+// Both pre and post processing happens within this function. Pre-processing
+// happens before transaction is send to backend, and post processing occurs
+// when backend notifies that transaction sending is complete (either successfully
+// or with error)
 func (q *JailedRequestQueue) ProcessSendTransactionRequest(vm *otto.Otto, req RPCCall) (common.Hash, error) {
 	// obtain status backend from LES service
 	lightEthereum, err := NodeManagerInstance().LightEthereumService()
@@ -189,13 +215,13 @@ func (q *JailedRequestQueue) ProcessSendTransactionRequest(vm *otto.Otto, req RP
 	}
 	backend := lightEthereum.StatusBackend
 
-	messageId, err := q.PreProcessRequest(vm, req)
+	messageID, err := q.PreProcessRequest(vm, req)
 	if err != nil {
 		return common.Hash{}, err
 	}
 	// onSendTransactionRequest() will use context to obtain and release ticket
 	ctx := context.Background()
-	ctx = context.WithValue(ctx, MessageIdKey, messageId)
+	ctx = context.WithValue(ctx, MessageIDKey, messageID)
 
 	//  this call blocks, up until Complete Transaction is called
 	txHash, err := backend.SendTransaction(ctx, sendTxArgsFromRPCCall(req))
@@ -204,20 +230,20 @@ func (q *JailedRequestQueue) ProcessSendTransactionRequest(vm *otto.Otto, req RP
 	}
 
 	// invoke post processing
-	q.PostProcessRequest(vm, req, messageId)
+	q.PostProcessRequest(vm, req, messageID)
 
 	return txHash, nil
 }
 
-// currentMessageId looks for `status.message_id` variable in current JS context
+// currentMessageID looks for `status.message_id` variable in current JS context
-func currentMessageId(ctx otto.Context) string {
+func currentMessageID(ctx otto.Context) string {
 	if statusObj, ok := ctx.Symbols["status"]; ok {
-		messageId, err := statusObj.Object().Get("message_id")
+		messageID, err := statusObj.Object().Get("message_id")
 		if err != nil {
 			return ""
 		}
-		if messageId, err := messageId.ToString(); err == nil {
+		if messageID, err := messageID.ToString(); err == nil {
-			return messageId
+			return messageID
 		}
 	}
 
@@ -287,6 +313,7 @@ func (r RPCCall) parseData() hexutil.Bytes {
 	return byteCode
 }
 
+// nolint: dupl
 func (r RPCCall) parseValue() *hexutil.Big {
 	params, ok := r.Params[0].(map[string]interface{})
 	if !ok {
@@ -307,6 +334,7 @@ func (r RPCCall) parseValue() *hexutil.Big {
 	return (*hexutil.Big)(parsedValue)
 }
 
+// nolint: dupl
 func (r RPCCall) parseGas() *hexutil.Big {
 	params, ok := r.Params[0].(map[string]interface{})
 	if !ok {
@@ -326,6 +354,7 @@ func (r RPCCall) parseGas() *hexutil.Big {
 	return (*hexutil.Big)(parsedValue)
 }
 
+// nolint: dupl
 func (r RPCCall) parseGasPrice() *hexutil.Big {
 	params, ok := r.Params[0].(map[string]interface{})
 	if !ok {

geth/txqueue_test.go

@@ -37,7 +37,9 @@ func TestQueuedContracts(t *testing.T) {
 		return
 	}
 
-	geth.Logout()
+	if err = geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	// make sure you panic if transaction complete doesn't return
 	completeQueuedTransaction := make(chan struct{}, 1)
@@ -45,7 +47,7 @@ func TestQueuedContracts(t *testing.T) {
 
 	// replace transaction notification handler
 	var txHash = common.Hash{}
-	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
+	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) { // nolint :dupl
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -57,7 +59,7 @@ func TestQueuedContracts(t *testing.T) {
 
 			// the first call will fail (we are not logged in, but trying to complete tx)
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != status.ErrInvalidCompleteTxSender {
-				t.Errorf("expected error on queued transation[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
+				t.Errorf("expected error on queued transaction[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
 				return
 			}
 
@@ -67,7 +69,7 @@ func TestQueuedContracts(t *testing.T) {
 				return
 			}
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != status.ErrInvalidCompleteTxSender {
-				t.Errorf("expected error on queued transation[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
+				t.Errorf("expected error on queued transaction[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
 				return
 			}
 
@@ -77,7 +79,7 @@ func TestQueuedContracts(t *testing.T) {
 				return
 			}
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
 				return
 			}
 
@@ -143,7 +145,9 @@ func TestQueuedTransactions(t *testing.T) {
 		return
 	}
 
-	geth.Logout()
+	if err = geth.Logout(); err != nil {
+		t.Fatal(err)
+	}
 
 	// make sure you panic if transaction complete doesn't return
 	completeQueuedTransaction := make(chan struct{}, 1)
@@ -151,7 +155,7 @@ func TestQueuedTransactions(t *testing.T) {
 
 	// replace transaction notification handler
 	var txHash = common.Hash{}
-	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
+	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) { // nolint: dupl
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -163,7 +167,7 @@ func TestQueuedTransactions(t *testing.T) {
 
 			// the first call will fail (we are not logged in, but trying to complete tx)
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != status.ErrInvalidCompleteTxSender {
-				t.Errorf("expected error on queued transation[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
+				t.Errorf("expected error on queued transaction[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
 				return
 			}
 
@@ -173,7 +177,7 @@ func TestQueuedTransactions(t *testing.T) {
 				return
 			}
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != status.ErrInvalidCompleteTxSender {
-				t.Errorf("expected error on queued transation[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
+				t.Errorf("expected error on queued transaction[%v] not thrown: expected %v, got %v", event["id"], status.ErrInvalidCompleteTxSender, err)
 				return
 			}
 
@@ -183,7 +187,7 @@ func TestQueuedTransactions(t *testing.T) {
 				return
 			}
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
 				return
 			}
 
@@ -246,7 +250,7 @@ func TestDoubleCompleteQueuedTransactions(t *testing.T) {
 	geth.PanicAfter(20*time.Second, completeQueuedTransaction, "TestQueuedTransactions")
 
 	// replace transaction notification handler
-	var txId string
+	var txID string
 	txFailedEventCalled := false
 	txHash := common.Hash{}
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
@@ -257,12 +261,12 @@ func TestDoubleCompleteQueuedTransactions(t *testing.T) {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be failed and completed on the second call): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be failed and completed on the second call): {id: %s}\n", txID)
 
 			// try with wrong password
 			// make sure that tx is NOT removed from the queue (by re-trying with the correct password)
-			if _, err = geth.CompleteTransaction(txId, testConfig.Account1.Password+"wrong"); err != keystore.ErrDecrypt {
+			if _, err = geth.CompleteTransaction(txID, testConfig.Account1.Password+"wrong"); err != keystore.ErrDecrypt {
 				t.Errorf("expects wrong password error, but call succeeded (or got another error: %v)", err)
 				return
 			}
@@ -274,7 +278,7 @@ func TestDoubleCompleteQueuedTransactions(t *testing.T) {
 
 			// now try to complete transaction, but with the correct password
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
 				return
 			}
 
@@ -370,7 +374,7 @@ func TestDiscardQueuedTransactions(t *testing.T) {
 	geth.PanicAfter(20*time.Second, completeQueuedTransaction, "TestDiscardQueuedTransactions")
 
 	// replace transaction notification handler
-	var txId string
+	var txID string
 	txFailedEventCalled := false
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
 		var envelope geth.SignalEnvelope
@@ -380,31 +384,31 @@ func TestDiscardQueuedTransactions(t *testing.T) {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txID)
 
-			if !backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if !backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should still have test tx: %s", txId)
+				t.Errorf("txqueue should still have test tx: %s", txID)
 				return
 			}
 
 			// discard
-			err := geth.DiscardTransaction(txId)
+			err := geth.DiscardTransaction(txID)
 			if err != nil {
 				t.Errorf("cannot discard tx: %v", err)
 				return
 			}
 
 			// try completing discarded transaction
-			_, err = geth.CompleteTransaction(txId, testConfig.Account1.Password)
+			_, err = geth.CompleteTransaction(txID, testConfig.Account1.Password)
 			if err.Error() != "transaction hash not found" {
 				t.Error("expects tx not found, but call to CompleteTransaction succeeded")
 				return
 			}
 
 			time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txID)
 				return
 			}
 
@@ -485,12 +489,12 @@ func TestCompleteMultipleQueuedTransactions(t *testing.T) {
 
 	// make sure you panic if transaction complete doesn't return
 	testTxCount := 3
-	txIds := make(chan string, testTxCount)
+	txIDs := make(chan string, testTxCount)
 	allTestTxCompleted := make(chan struct{}, 1)
 
 	// replace transaction notification handler
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
-		var txId string
+		var txID string
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -498,10 +502,10 @@ func TestCompleteMultipleQueuedTransactions(t *testing.T) {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be completed in a single call, once aggregated): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be completed in a single call, once aggregated): {id: %s}\n", txID)
 
-			txIds <- txId
+			txIDs <- txID
 		}
 	})
 
@@ -524,26 +528,29 @@ func TestCompleteMultipleQueuedTransactions(t *testing.T) {
 	}
 
 	// wait for transactions, and complete them in a single call
-	completeTxs := func(txIdStrings string) {
+	completeTxs := func(txIDStrings string) {
-		var parsedIds []string
+		var parsedIDs []string
-		json.Unmarshal([]byte(txIdStrings), &parsedIds)
+		if err := json.Unmarshal([]byte(txIDStrings), &parsedIDs); err != nil {
+			t.Error(err)
+			return
+		}
 
-		parsedIds = append(parsedIds, "invalid-tx-id")
+		parsedIDs = append(parsedIDs, "invalid-tx-id")
-		updatedTxIdStrings, _ := json.Marshal(parsedIds)
+		updatedTxIDStrings, _ := json.Marshal(parsedIDs)
 
 		// complete
-		results := geth.CompleteTransactions(string(updatedTxIdStrings), testConfig.Account1.Password)
+		results := geth.CompleteTransactions(string(updatedTxIDStrings), testConfig.Account1.Password)
 		if len(results) != (testTxCount+1) || results["invalid-tx-id"].Error.Error() != "transaction hash not found" {
 			t.Errorf("cannot complete txs: %v", results)
 			return
 		}
-		for txId, txResult := range results {
+		for txID, txResult := range results {
-			if txResult.Error != nil && txId != "invalid-tx-id" {
+			if txResult.Error != nil && txID != "invalid-tx-id" {
-				t.Errorf("invalid error for %s", txId)
+				t.Errorf("invalid error for %s", txID)
 				return
 			}
-			if txResult.Hash.Hex() == "0x0000000000000000000000000000000000000000000000000000000000000000" && txId != "invalid-tx-id" {
+			if txResult.Hash.Hex() == "0x0000000000000000000000000000000000000000000000000000000000000000" && txID != "invalid-tx-id" {
-				t.Errorf("invalid hash (expected non empty hash): %s", txId)
+				t.Errorf("invalid hash (expected non empty hash): %s", txID)
 				return
 			}
 
@@ -553,21 +560,21 @@ func TestCompleteMultipleQueuedTransactions(t *testing.T) {
 		}
 
 		time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-		for _, txId := range parsedIds {
+		for _, txID := range parsedIDs {
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be completed): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be completed): %s", txID)
 				return
 			}
 		}
 	}
 	go func() {
-		var txIdStrings []string
+		var txIDStrings []string
 		for i := 0; i < testTxCount; i++ {
-			txIdStrings = append(txIdStrings, <-txIds)
+			txIDStrings = append(txIDStrings, <-txIDs)
 		}
 
-		txIdJSON, _ := json.Marshal(txIdStrings)
+		txIDJSON, _ := json.Marshal(txIDStrings)
-		completeTxs(string(txIdJSON))
+		completeTxs(string(txIDJSON))
 		allTestTxCompleted <- struct{}{}
 	}()
 
@@ -616,13 +623,13 @@ func TestDiscardMultipleQueuedTransactions(t *testing.T) {
 
 	// make sure you panic if transaction complete doesn't return
 	testTxCount := 3
-	txIds := make(chan string, testTxCount)
+	txIDs := make(chan string, testTxCount)
 	allTestTxDiscarded := make(chan struct{}, 1)
 
 	// replace transaction notification handler
 	txFailedEventCallCount := 0
 	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
-		var txId string
+		var txID string
 		var envelope geth.SignalEnvelope
 		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
 			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
@@ -630,15 +637,15 @@ func TestDiscardMultipleQueuedTransactions(t *testing.T) {
 		}
 		if envelope.Type == geth.EventTransactionQueued {
 			event := envelope.Event.(map[string]interface{})
-			txId = event["id"].(string)
+			txID = event["id"].(string)
-			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txId)
+			t.Logf("transaction queued (will be discarded soon): {id: %s}\n", txID)
 
-			if !backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if !backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should still have test tx: %s", txId)
+				t.Errorf("txqueue should still have test tx: %s", txID)
 				return
 			}
 
-			txIds <- txId
+			txIDs <- txID
 		}
 
 		if envelope.Type == geth.EventTransactionFailed {
@@ -684,22 +691,25 @@ func TestDiscardMultipleQueuedTransactions(t *testing.T) {
 	}
 
 	// wait for transactions, and discard immediately
-	discardTxs := func(txIdStrings string) {
+	discardTxs := func(txIDStrings string) {
-		var parsedIds []string
+		var parsedIDs []string
-		json.Unmarshal([]byte(txIdStrings), &parsedIds)
+		if err := json.Unmarshal([]byte(txIDStrings), &parsedIDs); err != nil {
+			t.Error(err)
+			return
+		}
 
-		parsedIds = append(parsedIds, "invalid-tx-id")
+		parsedIDs = append(parsedIDs, "invalid-tx-id")
-		updatedTxIdStrings, _ := json.Marshal(parsedIds)
+		updatedTxIDStrings, _ := json.Marshal(parsedIDs)
 
 		// discard
-		discardResults := geth.DiscardTransactions(string(updatedTxIdStrings))
+		discardResults := geth.DiscardTransactions(string(updatedTxIDStrings))
 		if len(discardResults) != 1 || discardResults["invalid-tx-id"].Error.Error() != "transaction hash not found" {
 			t.Errorf("cannot discard txs: %v", discardResults)
 			return
 		}
 
 		// try completing discarded transaction
-		completeResults := geth.CompleteTransactions(string(updatedTxIdStrings), testConfig.Account1.Password)
+		completeResults := geth.CompleteTransactions(string(updatedTxIDStrings), testConfig.Account1.Password)
 		if len(completeResults) != (testTxCount + 1) {
 			t.Error("unexpected number of errors (call to CompleteTransaction should not succeed)")
 		}
@@ -715,21 +725,21 @@ func TestDiscardMultipleQueuedTransactions(t *testing.T) {
 		}
 
 		time.Sleep(1 * time.Second) // make sure that tx complete signal propagates
-		for _, txId := range parsedIds {
+		for _, txID := range parsedIDs {
-			if backend.TransactionQueue().Has(status.QueuedTxId(txId)) {
+			if backend.TransactionQueue().Has(status.QueuedTxID(txID)) {
-				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txId)
+				t.Errorf("txqueue should not have test tx at this point (it should be discarded): %s", txID)
 				return
 			}
 		}
 	}
 	go func() {
-		var txIdStrings []string
+		var txIDStrings []string
 		for i := 0; i < testTxCount; i++ {
-			txIdStrings = append(txIdStrings, <-txIds)
+			txIDStrings = append(txIDStrings, <-txIDs)
 		}
 
-		txIdJSON, _ := json.Marshal(txIdStrings)
+		txIDJSON, _ := json.Marshal(txIDStrings)
-		discardTxs(string(txIdJSON))
+		discardTxs(string(txIDJSON))
 	}()
 
 	// send multiple transactions
@@ -769,35 +779,15 @@ func TestNonExistentQueuedTransactions(t *testing.T) {
 	geth.PanicAfter(20*time.Second, completeQueuedTransaction, "TestQueuedTransactions")
 
 	// replace transaction notification handler
-	var txHash = common.Hash{}
+	geth.SetDefaultNodeNotificationHandler(func(string) {})
-	geth.SetDefaultNodeNotificationHandler(func(jsonEvent string) {
-		var envelope geth.SignalEnvelope
-		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
-			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
-			return
-		}
-		if envelope.Type == geth.EventTransactionQueued {
-			event := envelope.Event.(map[string]interface{})
-			t.Logf("Transaction queued (will be completed shortly): {id: %s}\n", event["id"].(string))
-
-			// next call is the very same one, but with the correct password
-			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
-				return
-			}
-
-			t.Logf("Transaction complete: https://testnet.etherscan.io/tx/%s", txHash.Hex())
-			completeQueuedTransaction <- struct{}{} // so that timeout is aborted
-		}
-	})
 
 	// try completing non-existing transaction
 	if _, err = geth.CompleteTransaction("some-bad-transaction-id", testConfig.Account1.Password); err == nil {
-		t.Error("error expected and not recieved")
+		t.Error("error expected and not received")
 		return
 	}
-	if err != status.ErrQueuedTxIdNotFound {
+	if err != status.ErrQueuedTxIDNotFound {
-		t.Errorf("unexpected error recieved: expected '%s', got: '%s'", status.ErrQueuedTxIdNotFound.Error(), err.Error())
+		t.Errorf("unexpected error received: expected '%s', got: '%s'", status.ErrQueuedTxIDNotFound.Error(), err.Error())
 		return
 	}
 }
@@ -841,7 +831,7 @@ func TestEvictionOfQueuedTransactions(t *testing.T) {
 
 			// next call is the very same one, but with the correct password
 			if txHash, err = geth.CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
-				t.Errorf("cannot complete queued transation[%v]: %v", event["id"], err)
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
 				return
 			}
 
@@ -852,10 +842,10 @@ func TestEvictionOfQueuedTransactions(t *testing.T) {
 
 	txQueue := backend.TransactionQueue()
 	var i = 0
-	txIds := [status.DefaultTxQueueCap + 5 + 10]status.QueuedTxId{}
+	txIDs := [status.DefaultTxQueueCap + 5 + 10]status.QueuedTxID{}
 	backend.SetTransactionQueueHandler(func(queuedTx status.QueuedTx) {
-		t.Logf("%d. Transaction queued (queue size: %d): {id: %v}\n", i, txQueue.Count(), queuedTx.Id)
+		t.Logf("%d. Transaction queued (queue size: %d): {id: %v}\n", i, txQueue.Count(), queuedTx.ID)
-		txIds[i] = queuedTx.Id
+		txIDs[i] = queuedTx.ID
 		i++
 	})
 
@@ -865,7 +855,7 @@ func TestEvictionOfQueuedTransactions(t *testing.T) {
 	}
 
 	for i := 0; i < 10; i++ {
-		go backend.SendTransaction(nil, status.SendTxArgs{})
+		go backend.SendTransaction(nil, status.SendTxArgs{}) // nolint: errcheck
 	}
 	time.Sleep(3 * time.Second)
 
@@ -877,7 +867,7 @@ func TestEvictionOfQueuedTransactions(t *testing.T) {
 	}
 
 	for i := 0; i < status.DefaultTxQueueCap+5; i++ { // stress test by hitting with lots of goroutines
-		go backend.SendTransaction(nil, status.SendTxArgs{})
+		go backend.SendTransaction(nil, status.SendTxArgs{}) // nolint: errcheck
 	}
 	time.Sleep(5 * time.Second)
 
@@ -886,8 +876,8 @@ func TestEvictionOfQueuedTransactions(t *testing.T) {
 		return
 	}
 
-	for _, txId := range txIds {
+	for _, txID := range txIDs {
-		txQueue.Remove(txId)
+		txQueue.Remove(txID)
 	}
 
 	if txQueue.Count() != 0 {

geth/types.go

@@ -5,11 +5,13 @@ import (
 	"github.com/ethereum/go-ethereum/les/status"
 )
 
+// SignalEnvelope is a general signal sent upward from node to RN app
 type SignalEnvelope struct {
 	Type  string      `json:"type"`
 	Event interface{} `json:"event"`
 }
 
+// AccountInfo represents account's info
 type AccountInfo struct {
 	Address  string `json:"address"`
 	PubKey   string `json:"pubkey"`
@@ -17,24 +19,23 @@ type AccountInfo struct {
 	Error    string `json:"error"`
 }
 
+// JSONError is wrapper around errors, that are sent upwards
 type JSONError struct {
 	Error string `json:"error"`
 }
 
+// NodeCrashEvent is special kind of error, used to report node crashes
 type NodeCrashEvent struct {
 	Error string `json:"error"`
 }
 
+// AddPeerResult is a JSON returned as a response to AddPeer() request
 type AddPeerResult struct {
 	Success bool   `json:"success"`
 	Error   string `json:"error"`
 }
 
-type AddWhisperFilterResult struct {
+// WhisperMessageEvent is a signal sent on incoming Whisper message
-	Id    int    `json:"id"`
-	Error string `json:"error"`
-}
-
 type WhisperMessageEvent struct {
 	Payload string `json:"payload"`
 	To      string `json:"to"`
@@ -44,55 +45,65 @@ type WhisperMessageEvent struct {
 	Hash    string `json:"hash"`
 }
 
+// SendTransactionEvent is a signal sent on a send transaction request
 type SendTransactionEvent struct {
-	Id        string            `json:"id"`
+	ID        string            `json:"id"`
 	Args      status.SendTxArgs `json:"args"`
-	MessageId string            `json:"message_id"`
+	MessageID string            `json:"message_id"`
 }
 
+// ReturnSendTransactionEvent is a JSON returned whenever transaction send is returned
 type ReturnSendTransactionEvent struct {
-	Id           string            `json:"id"`
+	ID           string            `json:"id"`
 	Args         status.SendTxArgs `json:"args"`
-	MessageId    string            `json:"message_id"`
+	MessageID    string            `json:"message_id"`
 	ErrorMessage string            `json:"error_message"`
 	ErrorCode    string            `json:"error_code"`
 }
 
+// CompleteTransactionResult is a JSON returned from transaction complete function (used in exposed method)
 type CompleteTransactionResult struct {
-	Id    string `json:"id"`
+	ID    string `json:"id"`
 	Hash  string `json:"hash"`
 	Error string `json:"error"`
 }
 
+// RawCompleteTransactionResult is a JSON returned from transaction complete function (used internally)
 type RawCompleteTransactionResult struct {
 	Hash  common.Hash
 	Error error
 }
 
+// CompleteTransactionsResult is list of results from CompleteTransactions() (used in exposed method)
 type CompleteTransactionsResult struct {
 	Results map[string]CompleteTransactionResult `json:"results"`
 }
 
+// RawDiscardTransactionResult is list of results from CompleteTransactions() (used internally)
 type RawDiscardTransactionResult struct {
 	Error error
 }
 
+// DiscardTransactionResult is a JSON returned from transaction discard function
 type DiscardTransactionResult struct {
-	Id    string `json:"id"`
+	ID    string `json:"id"`
 	Error string `json:"error"`
 }
 
+// DiscardTransactionsResult is a list of results from DiscardTransactions()
 type DiscardTransactionsResult struct {
 	Results map[string]DiscardTransactionResult `json:"results"`
 }
 
+// LocalStorageSetEvent is a signal sent whenever local storage Set method is called
 type LocalStorageSetEvent struct {
-	ChatId string `json:"chat_id"`
+	ChatID string `json:"chat_id"`
 	Data   string `json:"data"`
 }
 
+// RPCCall represents RPC call parameters
 type RPCCall struct {
-	Id     int64
+	ID     int64
 	Method string
 	Params []interface{}
 }

geth/utils.go

@@ -15,6 +15,7 @@ import (
 	"path/filepath"
 	"strings"
 	"sync"
+	"testing"
 	"time"
 
 	"github.com/ethereum/go-ethereum/accounts"
@@ -27,8 +28,12 @@ import (
 
 var (
 	muPrepareTestNode sync.Mutex
-	RootDir           string
+
-	TestDataDir       string
+	// RootDir is the main application directory
+	RootDir string
+
+	// TestDataDir is data directory used for tests
+	TestDataDir string
 )
 
 func init() {
@@ -47,6 +52,8 @@ func init() {
 	TestDataDir = filepath.Join(RootDir, ".ethereumtest")
 }
 
+// NodeNotificationHandler defines a handler able to process incoming node events.
+// Events are encoded as JSON strings.
 type NodeNotificationHandler func(jsonEvent string)
 
 var notificationHandler NodeNotificationHandler = TriggerDefaultNodeNotificationHandler
@@ -68,12 +75,12 @@ func SendSignal(signal SignalEnvelope) {
 }
 
 //export NotifyNode
-func NotifyNode(jsonEvent *C.char) {
+func NotifyNode(jsonEvent *C.char) { // nolint: golint
 	notificationHandler(C.GoString(jsonEvent))
 }
 
 //export TriggerTestSignal
-func TriggerTestSignal() {
+func TriggerTestSignal() { // nolint: golint
 	C.StatusServiceSignalEvent(C.CString(`{"answer": 42}`))
 }
 
@@ -106,27 +113,8 @@ func LoadTestConfig() (*TestConfig, error) {
 	return &testConfig, nil
 }
 
-func CopyFile(dst, src string) error {
+// LoadFromFile is useful for loading test data, from testdata/filename into a variable
-	s, err := os.Open(src)
+// nolint: errcheck
-	if err != nil {
-		return err
-	}
-	defer s.Close()
-
-	d, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-	defer d.Close()
-
-	if _, err := io.Copy(d, s); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// LoadFromFile is usefull for loading test data, from testdata/filename into a variable
 func LoadFromFile(filename string) string {
 	f, err := os.Open(filename)
 	if err != nil {
@@ -140,6 +128,7 @@ func LoadFromFile(filename string) string {
 	return string(buf.Bytes())
 }
 
+// PrepareTestNode initializes node manager and start a test node (only once!)
 func PrepareTestNode() (err error) {
 	muPrepareTestNode.Lock()
 	defer muPrepareTestNode.Unlock()
@@ -157,26 +146,26 @@ func PrepareTestNode() (err error) {
 	}
 
 	syncRequired := false
-	if _, err := os.Stat(TestDataDir); os.IsNotExist(err) {
+	if _, err = os.Stat(TestDataDir); os.IsNotExist(err) {
 		syncRequired = true
 	}
 
 	// prepare node directory
-	if err := os.MkdirAll(filepath.Join(TestDataDir, "keystore"), os.ModePerm); err != nil {
+	if err = os.MkdirAll(filepath.Join(TestDataDir, "keystore"), os.ModePerm); err != nil {
 		log.Warn("make node failed", "error", err)
 		return err
 	}
 
 	// import test accounts (with test ether on it)
-	if err := ImportTestAccount(filepath.Join(TestDataDir, "keystore"), "test-account1.pk"); err != nil {
+	if err = ImportTestAccount(filepath.Join(TestDataDir, "keystore"), "test-account1.pk"); err != nil {
 		panic(err)
 	}
-	if err := ImportTestAccount(filepath.Join(TestDataDir, "keystore"), "test-account2.pk"); err != nil {
+	if err = ImportTestAccount(filepath.Join(TestDataDir, "keystore"), "test-account2.pk"); err != nil {
 		panic(err)
 	}
 
 	// start geth node and wait for it to initialize
-	config, err := params.NewNodeConfig(filepath.Join(TestDataDir, "data"), params.TestNetworkId)
+	config, err := params.NewNodeConfig(filepath.Join(TestDataDir, "data"), params.TestNetworkID)
 	if err != nil {
 		return err
 	}
@@ -212,11 +201,42 @@ func PrepareTestNode() (err error) {
 	return nil
 }
 
-func RemoveTestNode() {
+// MakeTestCompleteTxHandler returns node notification handler to be used in test
-	err := os.RemoveAll(TestDataDir)
+// basically notification handler completes a transaction (that is enqueued after
+// the handler has been installed)
+func MakeTestCompleteTxHandler(t *testing.T, txHash *common.Hash, completed chan struct{}) (handler func(jsonEvent string), err error) {
+	testConfig, err := LoadTestConfig()
 	if err != nil {
-		log.Warn("could not clean up temporary datadir")
+		return
 	}
+
+	handler = func(jsonEvent string) {
+		var envelope SignalEnvelope
+		if err := json.Unmarshal([]byte(jsonEvent), &envelope); err != nil {
+			t.Errorf("cannot unmarshal event's JSON: %s", jsonEvent)
+			return
+		}
+		if envelope.Type == EventTransactionQueued {
+			event := envelope.Event.(map[string]interface{})
+
+			t.Logf("Transaction queued (will be completed shortly): {id: %s}\n", event["id"].(string))
+
+			if err := SelectAccount(testConfig.Account1.Address, testConfig.Account1.Password); err != nil {
+				t.Errorf("cannot select account: %v", testConfig.Account1.Address)
+				return
+			}
+
+			var err error
+			if *txHash, err = CompleteTransaction(event["id"].(string), testConfig.Account1.Password); err != nil {
+				t.Errorf("cannot complete queued transaction[%v]: %v", event["id"], err)
+				return
+			}
+
+			t.Logf("Contract created: https://testnet.etherscan.io/tx/%s", txHash.Hex())
+			close(completed) // so that timeout is aborted
+		}
+	}
+	return
 }
 
 // PanicAfter throws panic() after waitSeconds, unless abort channel receives notification
@@ -231,6 +251,8 @@ func PanicAfter(waitSeconds time.Duration, abort chan struct{}, desc string) {
 	}()
 }
 
+// FromAddress converts account address from string to common.Address.
+// The function is useful to format "From" field of send transaction struct.
 func FromAddress(accountAddress string) common.Address {
 	from, err := ParseAccountString(accountAddress)
 	if err != nil {
@@ -240,6 +262,8 @@ func FromAddress(accountAddress string) common.Address {
 	return from.Address
 }
 
+// ToAddress converts account address from string to *common.Address.
+// The function is useful to format "To" field of send transaction struct.
 func ToAddress(accountAddress string) *common.Address {
 	to, err := ParseAccountString(accountAddress)
 	if err != nil {
@@ -280,7 +304,7 @@ func AddressToDecryptedAccount(address, password string) (accounts.Account, *key
 func ImportTestAccount(keystoreDir, accountFile string) error {
 	// make sure that keystore folder exists
 	if _, err := os.Stat(keystoreDir); os.IsNotExist(err) {
-		os.MkdirAll(keystoreDir, os.ModePerm)
+		os.MkdirAll(keystoreDir, os.ModePerm) // nolint: errcheck
 	}
 
 	dst := filepath.Join(keystoreDir, accountFile)

geth/whisper.go

@@ -1,23 +1 @@
 package geth
-
-import (
-	"time"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/crypto"
-	whisper "github.com/ethereum/go-ethereum/whisper/whisperv2"
-)
-
-func onWhisperMessage(message *whisper.Message) {
-	SendSignal(SignalEnvelope{
-		Type: "whisper",
-		Event: WhisperMessageEvent{
-			Payload: string(message.Payload),
-			From:    common.ToHex(crypto.FromECDSAPub(message.Recover())),
-			To:      common.ToHex(crypto.FromECDSAPub(message.To)),
-			Sent:    message.Sent.Unix(),
-			TTL:     int64(message.TTL / time.Second),
-			Hash:    common.ToHex(message.Hash.Bytes()),
-		},
-	})
-}

geth/whisper_test.go

@@ -30,7 +30,9 @@ func TestWhisperFilterRace(t *testing.T) {
 	}
 	accountKey1Hex := common.ToHex(crypto.FromECDSAPub(&accountKey1.PrivateKey.PublicKey))
 
-	whisperService.AddKeyPair(accountKey1.PrivateKey)
+	if _, err = whisperService.AddKeyPair(accountKey1.PrivateKey); err != nil {
+		t.Fatal(err)
+	}
 	if ok, err := whisperAPI.HasKeyPair(accountKey1Hex); err != nil || !ok {
 		t.Fatalf("identity not injected: %v", accountKey1Hex)
 	}
@@ -42,7 +44,9 @@ func TestWhisperFilterRace(t *testing.T) {
 	}
 	accountKey2Hex := common.ToHex(crypto.FromECDSAPub(&accountKey2.PrivateKey.PublicKey))
 
-	whisperService.AddKeyPair(accountKey2.PrivateKey)
+	if _, err = whisperService.AddKeyPair(accountKey2.PrivateKey); err != nil {
+		t.Fatal(err)
+	}
 	if ok, err := whisperAPI.HasKeyPair(accountKey2Hex); err != nil || !ok {
 		t.Fatalf("identity not injected: %v", accountKey2Hex)
 	}
@@ -65,6 +69,7 @@ func TestWhisperFilterRace(t *testing.T) {
 
 	for i := 0; i < 10; i++ {
 		go func() {
+			// nolint: errcheck
 			whisperAPI.Subscribe(whisper.WhisperFilterArgs{
 				Sig: accountKey1Hex,
 				Key: accountKey2Hex,

static/config/linter_exclude_list.txt

@@ -0,0 +1,23 @@
+comment on exported function CreateAccount should be of the form "CreateAccount ..." (golint)
+comment on exported function CreateChildAccount should be of the form "CreateChildAccount ..." (golint)
+comment on exported function RecoverAccount should be of the form "RecoverAccount ..." (golint)
+comment on exported function Login should be of the form "Login ..." (golint)
+comment on exported function Logout should be of the form "Logout ..." (golint)
+comment on exported function CompleteTransaction should be of the form "CompleteTransaction ..." (golint)
+comment on exported function CompleteTransactions should be of the form "CompleteTransactions ..." (golint)
+comment on exported function DiscardTransaction should be of the form "DiscardTransaction ..." (golint)
+comment on exported function DiscardTransactions should be of the form "DiscardTransactions ..." (golint)
+comment on exported function GenerateConfig should be of the form "GenerateConfig ..." (golint)
+comment on exported function StartNode should be of the form "StartNode ..." (golint)
+comment on exported function StopNode should be of the form "StopNode ..." (golint)
+comment on exported function ResumeNode should be of the form "ResumeNode ..." (golint)
+comment on exported function ResetChainData should be of the form "ResetChainData ..." (golint)
+comment on exported function StopNodeRPCServer should be of the form "StopNodeRPCServer ..." (golint)
+comment on exported function StartNodeRPCServer should be of the form "StartNodeRPCServer ..." (golint)
+comment on exported function InitJail should be of the form "InitJail ..." (golint)
+comment on exported function Parse should be of the form "Parse ..." (golint)
+comment on exported function Call should be of the form "Call ..." (golint)
+comment on exported function PopulateStaticPeers should be of the form "PopulateStaticPeers ..." (golint)
+comment on exported function AddPeer should be of the form "AddPeer ..." (golint)
+comment on exported function NotifyNode should be of the form "NotifyNode ..." (golint)
+comment on exported function TriggerTestSignal should be of the form "TriggerTestSignal ..." (golint)

vendor/github.com/ethereum/go-ethereum/internal/ethapi/status_backend.go

@@ -99,7 +99,7 @@ func (b *StatusBackend) SendTransaction(ctx context.Context, args status.SendTxA
 	}
 
 	queuedTx := &status.QueuedTx{
-		Id:      status.QueuedTxId(uuid.New()),
+		ID:      status.QueuedTxID(uuid.New()),
 		Hash:    common.Hash{},
 		Context: ctx,
 		Args:    status.SendTxArgs(args),
@@ -130,7 +130,7 @@ func (b *StatusBackend) SendTransaction(ctx context.Context, args status.SendTxA
 }
 
 // CompleteQueuedTransaction wraps call to PublicTransactionPoolAPI.CompleteQueuedTransaction
-func (b *StatusBackend) CompleteQueuedTransaction(ctx context.Context, id status.QueuedTxId, passphrase string) (common.Hash, error) {
+func (b *StatusBackend) CompleteQueuedTransaction(ctx context.Context, id status.QueuedTxID, passphrase string) (common.Hash, error) {
 	queuedTx, err := b.txQueue.Get(id)
 	if err != nil {
 		return common.Hash{}, err
@@ -159,14 +159,14 @@ func (b *StatusBackend) CompleteQueuedTransaction(ctx context.Context, id status
 }
 
 // DiscardQueuedTransaction discards queued transaction forcing SendTransaction to return
-func (b *StatusBackend) DiscardQueuedTransaction(id status.QueuedTxId) error {
+func (b *StatusBackend) DiscardQueuedTransaction(id status.QueuedTxID) error {
 	queuedTx, err := b.txQueue.Get(id)
 	if err != nil {
 		return err
 	}
 
 	// remove from queue, before notifying SendTransaction
-	b.TransactionQueue().Remove(queuedTx.Id)
+	b.TransactionQueue().Remove(queuedTx.ID)
 
 	// allow SendTransaction to return
 	queuedTx.Err = status.ErrQueuedTxDiscarded

vendor/github.com/ethereum/go-ethereum/les/status/txqueue.go

@@ -19,7 +19,7 @@ const (
 )
 
 var (
-	ErrQueuedTxIdNotFound      = errors.New("transaction hash not found")
+	ErrQueuedTxIDNotFound      = errors.New("transaction hash not found")
 	ErrQueuedTxTimedOut        = errors.New("transaction sending timed out")
 	ErrQueuedTxDiscarded       = errors.New("transaction has been discarded")
 	ErrInvalidCompleteTxSender = errors.New("transaction can only be completed by the same account which created it")
@@ -27,9 +27,9 @@ var (
 
 // TxQueue is capped container that holds pending transactions
 type TxQueue struct {
-	transactions  map[QueuedTxId]*QueuedTx
+	transactions  map[QueuedTxID]*QueuedTx
 	mu            sync.RWMutex // to guard transactions map
-	evictableIds  chan QueuedTxId
+	evictableIDs  chan QueuedTxID
 	enqueueTicker chan struct{}
 	incomingPool  chan *QueuedTx
 
@@ -46,7 +46,7 @@ type TxQueue struct {
 
 // QueuedTx holds enough information to complete the queued transaction.
 type QueuedTx struct {
-	Id      QueuedTxId
+	ID      QueuedTxID
 	Hash    common.Hash
 	Context context.Context
 	Args    SendTxArgs
@@ -55,8 +55,8 @@ type QueuedTx struct {
 	Err     error
 }
 
-// QueuedTxId queued transaction identifier
+// QueuedTxID queued transaction identifier
-type QueuedTxId string
+type QueuedTxID string
 
 // EnqueuedTxHandler is a function that receives queued/pending transactions, when they get queued
 type EnqueuedTxHandler func(QueuedTx)
@@ -79,8 +79,8 @@ type SendTxArgs struct {
 func NewTransactionQueue() *TxQueue {
 	log.Info("StatusIM: initializing transaction queue")
 	return &TxQueue{
-		transactions:  make(map[QueuedTxId]*QueuedTx),
+		transactions:  make(map[QueuedTxID]*QueuedTx),
-		evictableIds:  make(chan QueuedTxId, DefaultTxQueueCap), // will be used to evict in FIFO
+		evictableIDs:  make(chan QueuedTxID, DefaultTxQueueCap), // will be used to evict in FIFO
 		enqueueTicker: make(chan struct{}),
 		incomingPool:  make(chan *QueuedTx, DefaultTxSendQueueCap),
 	}
@@ -110,7 +110,7 @@ func (q *TxQueue) evictionLoop() {
 		select {
 		case <-q.enqueueTicker:
 			if len(q.transactions) >= (DefaultTxQueueCap - 1) { // eviction is required to accommodate another/last item
-				q.Remove(<-q.evictableIds)
+				q.Remove(<-q.evictableIDs)
 				q.enqueueTicker <- struct{}{} // in case we pulled already removed item
 			}
 		case <-q.stopped:
@@ -127,7 +127,7 @@ func (q *TxQueue) enqueueLoop() {
 	for {
 		select {
 		case queuedTx := <-q.incomingPool:
-			log.Info("StatusIM: transaction enqueued", "tx", queuedTx.Id)
+			log.Info("StatusIM: transaction enqueued", "tx", queuedTx.ID)
 			q.Enqueue(queuedTx)
 		case <-q.stopped:
 			log.Info("StatusIM: transaction queue's enqueue loop stopped")
@@ -142,8 +142,8 @@ func (q *TxQueue) Reset() {
 	q.mu.Lock()
 	defer q.mu.Unlock()
 
-	q.transactions = make(map[QueuedTxId]*QueuedTx)
+	q.transactions = make(map[QueuedTxID]*QueuedTx)
-	q.evictableIds = make(chan QueuedTxId, DefaultTxQueueCap)
+	q.evictableIDs = make(chan QueuedTxID, DefaultTxQueueCap)
 }
 
 // EnqueueAsync enqueues incoming transaction in async manner, returns as soon as possible
@@ -160,10 +160,10 @@ func (q *TxQueue) Enqueue(tx *QueuedTx) error {
 	}
 
 	q.enqueueTicker <- struct{}{} // notify eviction loop that we are trying to insert new item
-	q.evictableIds <- tx.Id       // this will block when we hit DefaultTxQueueCap
+	q.evictableIDs <- tx.ID       // this will block when we hit DefaultTxQueueCap
 
 	q.mu.Lock()
-	q.transactions[tx.Id] = tx
+	q.transactions[tx.ID] = tx
 	q.mu.Unlock()
 
 	// notify handler
@@ -173,7 +173,7 @@ func (q *TxQueue) Enqueue(tx *QueuedTx) error {
 }
 
 // Get returns transaction by transaction identifier
-func (q *TxQueue) Get(id QueuedTxId) (*QueuedTx, error) {
+func (q *TxQueue) Get(id QueuedTxID) (*QueuedTx, error) {
 	q.mu.RLock()
 	defer q.mu.RUnlock()
 
@@ -181,11 +181,11 @@ func (q *TxQueue) Get(id QueuedTxId) (*QueuedTx, error) {
 		return tx, nil
 	}
 
-	return nil, ErrQueuedTxIdNotFound
+	return nil, ErrQueuedTxIDNotFound
 }
 
 // Remove removes transaction by transaction identifier
-func (q *TxQueue) Remove(id QueuedTxId) {
+func (q *TxQueue) Remove(id QueuedTxID) {
 	q.mu.Lock()
 	defer q.mu.Unlock()
 
@@ -201,7 +201,7 @@ func (q *TxQueue) Count() int {
 }
 
 // Has checks whether transaction with a given identifier exists in queue
-func (q *TxQueue) Has(id QueuedTxId) bool {
+func (q *TxQueue) Has(id QueuedTxID) bool {
 	q.mu.RLock()
 	defer q.mu.RUnlock()
 
@@ -234,7 +234,7 @@ func (q *TxQueue) NotifyOnQueuedTxReturn(queuedTx *QueuedTx, err error) {
 
 	// on success, remove item from the queue and stop propagating
 	if err == nil {
-		q.Remove(queuedTx.Id)
+		q.Remove(queuedTx.ID)
 		return
 	}
 
@@ -249,7 +249,7 @@ func (q *TxQueue) NotifyOnQueuedTxReturn(queuedTx *QueuedTx, err error) {
 		ErrInvalidCompleteTxSender: true, // completing tx create from another account
 	}
 	if !transientErrs[err] { // remove only on unrecoverable errors
-		q.Remove(queuedTx.Id)
+		q.Remove(queuedTx.ID)
 	}
 
 	// notify handler