[wallet] Reduce number of RPC requests

- Wallet service is not started on foreground event on status-go side
  anymore, it leaves a client side opportunity to decide whether new
  blocks should be watched.
- `watchNewBlocks` parameter is added to `StartWallet`.
- Some requests are removed/moved to the place where they are necessary.

VERSION

@@ -1 +1 @@
-0.63.12
+0.64.0

api/geth_backend.go

@@ -882,26 +882,7 @@ func (b *GethStatusBackend) AppStateChange(state string) {
 	b.log.Info("App State changed", "new-state", s)
 	b.appState = s
 
-	if s == appStateForeground && !b.forceStopWallet {
+	if s == appStateBackground {
-		wallet, err := b.statusNode.WalletService()
-		if err != nil {
-			b.log.Error("Retrieving of wallet service failed on app state change to active", "error", err)
-			return
-		}
-		if !wallet.IsStarted() {
-			err = wallet.Start(b.statusNode.Server())
-			if err != nil {
-				b.log.Error("Wallet service start failed on app state change to active", "error", err)
-				return
-			}
-
-			err = b.startWallet()
-			if err != nil {
-				b.log.Error("Wallet reactor start failed on app state change to active", "error", err)
-				return
-			}
-		}
-	} else if s == appStateBackground && !b.forceStopWallet {
 		localNotifications, err := b.statusNode.LocalNotificationsService()
 		if err != nil {
 			b.log.Error("Retrieving of local notifications service failed on app state change", "error", err)
@@ -947,7 +928,7 @@ func (b *GethStatusBackend) StopWallet() error {
 	return nil
 }
 
-func (b *GethStatusBackend) StartWallet() error {
+func (b *GethStatusBackend) StartWallet(watchNewBlocks bool) error {
 	wallet, err := b.statusNode.WalletService()
 	if err != nil {
 		b.log.Error("Retrieving of wallet service failed on StartWallet", "error", err)
@@ -960,7 +941,7 @@ func (b *GethStatusBackend) StartWallet() error {
 			return nil
 		}
 
-		err = b.startWallet()
+		err = b.startWallet(watchNewBlocks)
 		if err != nil {
 			b.log.Error("Wallet reactor start failed on StartWallet", "error", err)
 			return nil
@@ -1187,7 +1168,7 @@ func (b *GethStatusBackend) injectAccountIntoServices() error {
 	return nil
 }
 
-func (b *GethStatusBackend) startWallet() error {
+func (b *GethStatusBackend) startWallet(watchNewBlocks bool) error {
 	if !b.statusNode.Config().WalletConfig.Enabled {
 		return nil
 	}
@@ -1197,7 +1178,11 @@ func (b *GethStatusBackend) startWallet() error {
 		return err
 	}
 
-	watchAddresses := b.accountManager.WatchAddresses()
+	accountsDB := accounts.NewDB(b.appDB)
+	watchAddresses, err := accountsDB.GetWalletAddresses()
+	if err != nil {
+		return err
+	}
 
 	mainAccountAddress, err := b.accountManager.MainAccountAddress()
 	if err != nil {
@@ -1220,7 +1205,8 @@ func (b *GethStatusBackend) startWallet() error {
 	return wallet.StartReactor(
 		b.statusNode.RPCClient().Ethclient(),
 		allAddresses,
-		new(big.Int).SetUint64(b.statusNode.Config().NetworkID))
+		new(big.Int).SetUint64(b.statusNode.Config().NetworkID),
+		watchNewBlocks)
 }
 
 // InjectChatAccount selects the current chat account using chatKeyHex and injects the key into whisper.

mobile/status.go

@@ -518,8 +518,8 @@ func StopWallet() string {
 }
 
 // StartWallet
-func StartWallet() string {
+func StartWallet(watchNewBlocks bool) string {
-	err := statusBackend.StartWallet()
+	err := statusBackend.StartWallet(watchNewBlocks)
 	return makeJSONResponse(err)
 }
 

services/local-notifications/core.go

@@ -59,6 +59,7 @@ type TransactionEvent struct {
 	Accounts                  []common.Address            `json:"accounts"`
 	NewTransactionsPerAccount map[common.Address]int      `json:"new-transactions"`
 	ERC20                     bool                        `json:"erc20"`
+	MaxKnownBlocks            map[common.Address]*big.Int `json:"max-known-blocks"`
 }
 
 // MessageEvent - structure used to pass messages from chat to bus
@@ -165,6 +166,7 @@ func (s *Service) transactionsHandler(payload TransactionEvent) {
 	limit := 20
 	if payload.BlockNumber != nil {
 		for _, address := range payload.Accounts {
+			if payload.BlockNumber.Cmp(payload.MaxKnownBlocks[address]) == 1 {
 				log.Info("Handled transfer for address", "info", address)
 				transfers, err := s.walletDB.GetTransfersByAddressAndBlock(address, payload.BlockNumber, int64(limit))
 				if err != nil {
@@ -178,6 +180,7 @@ func (s *Service) transactionsHandler(payload TransactionEvent) {
 			}
 		}
 	}
+}
 
 // SubscribeWallet - Subscribes to wallet signals
 func (s *Service) SubscribeWallet(publisher *event.Feed) error {
@@ -215,6 +218,7 @@ func (s *Service) StartWalletWatcher() {
 
 	s.walletTransmitter.wg.Add(1)
 
+	maxKnownBlocks := map[common.Address]*big.Int{}
 	go func() {
 		defer s.walletTransmitter.wg.Done()
 		for {
@@ -230,14 +234,21 @@ func (s *Service) StartWalletWatcher() {
 				}
 				return
 			case event := <-events:
-				if event.Type == wallet.EventNewBlock {
+				if event.Type == wallet.EventNewBlock && len(maxKnownBlocks) > 0 {
 					s.transmitter.publisher.Send(TransactionEvent{
 						Type:                      string(event.Type),
 						BlockNumber:               event.BlockNumber,
 						Accounts:                  event.Accounts,
 						NewTransactionsPerAccount: event.NewTransactionsPerAccount,
 						ERC20:                     event.ERC20,
+						MaxKnownBlocks:            maxKnownBlocks,
 					})
+				} else if event.Type == wallet.EventMaxKnownBlock {
+					for _, address := range event.Accounts {
+						if _, ok := maxKnownBlocks[address]; !ok {
+							maxKnownBlocks[address] = event.BlockNumber
+						}
+					}
 				}
 			}
 		}

services/local-notifications/core_test.go

@@ -105,6 +105,12 @@ func TestTransactionNotification(t *testing.T) {
 	require.NoError(t, walletDb.ProcessBlocks(header.Address, big.NewInt(1), big.NewInt(1), []*wallet.DBHeader{header}))
 	require.NoError(t, walletDb.ProcessTranfers(transfers, []*wallet.DBHeader{}))
 
+	feed.Send(wallet.Event{
+		Type:        wallet.EventMaxKnownBlock,
+		BlockNumber: big.NewInt(0),
+		Accounts:    []common.Address{header.Address},
+	})
+
 	feed.Send(wallet.Event{
 		Type:        wallet.EventNewBlock,
 		BlockNumber: header.Number,

services/wallet/commands.go

@@ -450,6 +450,7 @@ type controlCommand struct {
 	client         *ethclient.Client
 	feed           *event.Feed
 	safetyDepth    *big.Int
+	watchNewBlocks bool
 }
 
 // run fast indexing for every accont up to canonical chain head minus safety depth.
@@ -558,7 +559,7 @@ func loadTransfers(ctx context.Context, accounts []common.Address, db *Database,
 		}
 
 		for _, block := range blocks {
-			erc20 := &transfersCommand{
+			transfers := &transfersCommand{
 				db:      db,
 				client:  client,
 				address: address,
@@ -570,8 +571,8 @@ func loadTransfers(ctx context.Context, accounts []common.Address, db *Database,
 				},
 				block: block,
 			}
-			commands = append(commands, erc20)
+			commands = append(commands, transfers)
-			group.Add(erc20.Command())
+			group.Add(transfers.Command())
 		}
 	}
 	select {
@@ -731,12 +732,6 @@ func (c *controlCommand) Run(parent context.Context) error {
 	if target.Cmp(zero) <= 0 {
 		target = zero
 	}
-	ctx, cancel = context.WithTimeout(parent, 3*time.Second)
-	head, err = c.client.HeaderByNumber(ctx, target)
-	cancel()
-	if err != nil {
-		return err
-	}
 
 	fromByAddress := map[common.Address]*big.Int{}
 	toByAddress := map[common.Address]*big.Int{}
@@ -748,7 +743,7 @@ func (c *controlCommand) Run(parent context.Context) error {
 		}
 
 		fromByAddress[address] = from
-		toByAddress[address] = head.Number
+		toByAddress[address] = target
 	}
 
 	bCache := newBalanceCache()
@@ -779,13 +774,32 @@ func (c *controlCommand) Run(parent context.Context) error {
 		return err
 	}
 
+	for _, address := range c.accounts {
+		for _, header := range cmnd.foundHeaders[address] {
+			c.feed.Send(Event{
+				Type:                      EventNewBlock,
+				BlockNumber:               header.Number,
+				Accounts:                  []common.Address{address},
+				NewTransactionsPerAccount: map[common.Address]int{address: 20},
+			})
+		}
+	}
+
 	c.feed.Send(Event{
 		Type:        EventRecentHistoryReady,
 		Accounts:    c.accounts,
-		BlockNumber: head.Number,
+		BlockNumber: target,
 	})
 
-	log.Info("watching new blocks", "start from", head.Number)
+	if c.watchNewBlocks {
+		ctx, cancel = context.WithTimeout(parent, 3*time.Second)
+		head, err = c.client.HeaderByNumber(ctx, target)
+		cancel()
+		if err != nil {
+			return err
+		}
+
+		log.Info("watching new blocks", "start from", target)
 		cmd := &newBlocksTransfersCommand{
 			db:                   c.db,
 			chain:                c.chain,
@@ -804,6 +818,13 @@ func (c *controlCommand) Run(parent context.Context) error {
 			log.Warn("error on running newBlocksTransfersCommand", "err", err)
 			return err
 		}
+	} else {
+		c.feed.Send(Event{
+			Type:        EventNewBlock,
+			BlockNumber: target,
+			Accounts:    []common.Address{},
+		})
+	}
 
 	log.Info("end control command")
 	return err
@@ -965,6 +986,7 @@ func (c *findAndCheckBlockRangeCommand) Run(parent context.Context) (err error)
 	}
 
 	foundHeaders := map[common.Address][]*DBHeader{}
+	maxBlockNumber := big.NewInt(0)
 	for _, address := range c.accounts {
 		ethHeaders := ethHeadersByAddress[address]
 		erc20Headers := erc20HeadersByAddress[address]
@@ -972,6 +994,12 @@ func (c *findAndCheckBlockRangeCommand) Run(parent context.Context) (err error)
 		allHeaders := append(ethHeaders, erc20Headers...)
 		foundHeaders[address] = allHeaders
 
+		for _, header := range allHeaders {
+			if header.Number.Cmp(maxBlockNumber) == 1 {
+				maxBlockNumber = header.Number
+			}
+		}
+
 		log.Debug("saving headers", "len", len(allHeaders), "address")
 		err = c.db.ProcessBlocks(address, newFromByAddress[address], c.toByAddress[address], allHeaders)
 		if err != nil {
@@ -979,6 +1007,12 @@ func (c *findAndCheckBlockRangeCommand) Run(parent context.Context) (err error)
 		}
 	}
 
+	c.feed.Send(Event{
+		Type:        EventMaxKnownBlock,
+		BlockNumber: maxBlockNumber,
+		Accounts:    c.accounts,
+	})
+
 	c.foundHeaders = foundHeaders
 
 	return

services/wallet/concurrent.go

@@ -110,12 +110,6 @@ func checkRanges(parent context.Context, client reactorClient, cache BalanceCach
 			}
 			if lb.Cmp(hb) == 0 {
 				log.Debug("balances are equal", "from", from, "to", to)
-				// In case if balances are equal but non zero we want to check if
-				// eth_getTransactionCount return different values, because there
-				// still might be transactions
-				if lb.Cmp(zero) != 0 {
-					return nil
-				}
 
 				ln, err := client.NonceAt(ctx, account, from)
 				if err != nil {

services/wallet/events.go

@@ -12,6 +12,7 @@ type EventType string
 const (
 	// EventNewBlock emitted when new block was added to the same canonical chan.
 	EventNewBlock      EventType = "newblock"
+	EventMaxKnownBlock EventType = "maxKnownBlock"
 	// EventReorg emitted when canonical chain was changed. In this case, BlockNumber will be an earliest added block.
 	EventReorg EventType = "reorg"
 	// EventNewHistory emitted if transfer from older block was added.

services/wallet/iterative.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/log"
@@ -70,22 +69,14 @@ func (d *IterativeDownloader) Next(parent context.Context) ([]*DBHeader, *big.In
 		from = d.from
 	}
 	log.Info("load erc20 transfers in range", "from", from, "to", to)
-	headres, err := d.downloader.GetHeadersInRange(parent, from, to)
+	headers, err := d.downloader.GetHeadersInRange(parent, from, to)
 	if err != nil {
 		log.Error("failed to get transfer in between two bloks", "from", from, "to", to, "error", err)
 		return nil, nil, nil, err
 	}
-	// use integers instead of DBHeader
-	ctx, cancel := context.WithTimeout(parent, 5*time.Second)
-	header, err := d.client.HeaderByNumber(ctx, from)
-	cancel()
-	if err != nil {
-		log.Error("failed to get header by number", "from", d.from, "to", to, "error", err)
-		return nil, nil, nil, err
-	}
 
-	d.previous, d.to = d.to, header.Number
+	d.previous, d.to = d.to, from
-	return headres, d.from, to, nil
+	return headers, d.from, to, nil
 }
 
 // Revert reverts last step progress. Should be used if application failed to process transfers.

services/wallet/reactor.go

@@ -32,7 +32,7 @@ func pollingPeriodByChain(chain *big.Int) time.Duration {
 func reorgSafetyDepth(chain *big.Int) *big.Int {
 	switch chain.Int64() {
 	case int64(params.MainNetworkID):
-		return big.NewInt(5)
+		return big.NewInt(2)
 	case int64(params.RopstenNetworkID):
 		return big.NewInt(15)
 	default:
@@ -63,12 +63,13 @@ type reactorClient interface {
 }
 
 // NewReactor creates instance of the Reactor.
-func NewReactor(db *Database, feed *event.Feed, client *ethclient.Client, chain *big.Int) *Reactor {
+func NewReactor(db *Database, feed *event.Feed, client *ethclient.Client, chain *big.Int, watchNewBlocks bool) *Reactor {
 	return &Reactor{
 		db:             db,
 		client:         client,
 		feed:           feed,
 		chain:          chain,
+		watchNewBlocks: watchNewBlocks,
 	}
 }
 
@@ -78,6 +79,7 @@ type Reactor struct {
 	db             *Database
 	feed           *event.Feed
 	chain          *big.Int
+	watchNewBlocks bool
 
 	mu    sync.Mutex
 	group *Group
@@ -99,6 +101,7 @@ func (r *Reactor) newControlCommand(accounts []common.Address) *controlCommand {
 		erc20:          NewERC20TransfersDownloader(r.client, accounts, signer),
 		feed:           r.feed,
 		safetyDepth:    reorgSafetyDepth(r.chain),
+		watchNewBlocks: r.watchNewBlocks,
 	}
 
 	return ctl

services/wallet/service.go

@@ -52,8 +52,8 @@ func (s *Service) GetFeed() *event.Feed {
 }
 
 // StartReactor separately because it requires known ethereum address, which will become available only after login.
-func (s *Service) StartReactor(client *ethclient.Client, accounts []common.Address, chain *big.Int) error {
+func (s *Service) StartReactor(client *ethclient.Client, accounts []common.Address, chain *big.Int, watchNewBlocks bool) error {
-	reactor := NewReactor(s.db, s.feed, client, chain)
+	reactor := NewReactor(s.db, s.feed, client, chain, watchNewBlocks)
 	err := reactor.Start(accounts)
 	if err != nil {
 		return err

services/wallet/service_test.go

@@ -54,7 +54,7 @@ func (s *ReactorChangesSuite) SetupTest() {
 	s.backend, err = testchain.NewBackend()
 	s.Require().NoError(err)
 	s.feed = &event.Feed{}
-	s.reactor = NewReactor(s.db, &event.Feed{}, s.backend.Client, big.NewInt(1337))
+	s.reactor = NewReactor(s.db, &event.Feed{}, s.backend.Client, big.NewInt(1337), true)
 	account, err := crypto.GenerateKey()
 	s.Require().NoError(err)
 	s.first = crypto.PubkeyToAddress(account.PublicKey)
@@ -123,13 +123,13 @@ func TestServiceStartStop(t *testing.T) {
 	account, err := crypto.GenerateKey()
 	require.NoError(t, err)
 
-	err = s.StartReactor(backend.Client, []common.Address{crypto.PubkeyToAddress(account.PublicKey)}, big.NewInt(1337))
+	err = s.StartReactor(backend.Client, []common.Address{crypto.PubkeyToAddress(account.PublicKey)}, big.NewInt(1337), true)
 	require.NoError(t, err)
 
 	require.NoError(t, s.Stop())
 	require.NoError(t, s.Start(nil))
 
-	err = s.StartReactor(backend.Client, []common.Address{crypto.PubkeyToAddress(account.PublicKey)}, big.NewInt(1337))
+	err = s.StartReactor(backend.Client, []common.Address{crypto.PubkeyToAddress(account.PublicKey)}, big.NewInt(1337), true)
 	require.NoError(t, err)
 	require.NoError(t, s.Stop())
 }