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accounts/abi: handle named ouputs prefixed with underscores (#15766) 

* accounts/abi: handle named ouputs prefixed with underscores

* accounts/abi: handle collinding outputs for struct unpacks

* accounts: handle purely underscore output names
This commit is contained in:
Péter Szilágyi 2017-12-29 23:20:02 +02:00 committed by GitHub
parent 36a10875c8
commit b9731767af
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 153 additions and 4 deletions
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30
accounts/abi/argument.go
View File

@ -96,6 +96,20 @@ func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
if err := requireUnpackKind(value, typ, kind, arguments); err != nil {
return err
}
// If the output interface is a struct, make sure names don't collide
if kind == reflect.Struct {
exists := make(map[string]bool)
for _, arg := range arguments {
field := capitalise(arg.Name)
if field == "" {
return fmt.Errorf("abi: purely underscored output cannot unpack to struct")
}
if exists[field] {
return fmt.Errorf("abi: multiple outputs mapping to the same struct field '%s'", field)
}
exists[field] = true
}
}
// `i` counts the nonindexed arguments.
// `j` counts the number of complex types.
// both `i` and `j` are used to to correctly compute `data` offset.
@ -123,10 +137,10 @@ func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
switch kind {
case reflect.Struct:
name := capitalise(arg.Name)
for j := 0; j < typ.NumField(); j++ {
field := typ.Field(j)
// TODO read tags: `abi:"fieldName"`
if field.Name == strings.ToUpper(arg.Name[:1])+arg.Name[1:] {
if typ.Field(j).Name == name {
if err := set(value.Field(j), reflectValue, arg); err != nil {
return err
}
@ -222,3 +236,15 @@ func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
return ret, nil
}
// capitalise makes the first character of a string upper case, also removing any
// prefixing underscores from the variable names.
func capitalise(input string) string {
for len(input) > 0 && input[0] == '_' {
input = input[1:]
}
if len(input) == 0 {
return ""
}
return strings.ToUpper(input[:1]) + input[1:]
}

20
accounts/abi/bind/bind.go
View File

@ -304,8 +304,15 @@ var methodNormalizer = map[Lang]func(string) string{
LangJava: decapitalise,
}
// capitalise makes the first character of a string upper case.
// capitalise makes the first character of a string upper case, also removing any
// prefixing underscores from the variable names.
func capitalise(input string) string {
for len(input) > 0 && input[0] == '_' {
input = input[1:]
}
if len(input) == 0 {
return ""
}
return strings.ToUpper(input[:1]) + input[1:]
}
@ -315,15 +322,24 @@ func decapitalise(input string) string {
}
// structured checks whether a method has enough information to return a proper
// Go struct ot if flat returns are needed.
// Go struct or if flat returns are needed.
func structured(method abi.Method) bool {
if len(method.Outputs) < 2 {
return false
}
exists := make(map[string]bool)
for _, out := range method.Outputs {
// If the name is anonymous, we can't organize into a struct
if out.Name == "" {
return false
}
// If the field name is empty when normalized or collides (var, Var, _var, _Var),
// we can't organize into a struct
field := capitalise(out.Name)
if field == "" || exists[field] {
return false
}
exists[field] = true
}
return true
}

62
accounts/abi/bind/bind_test.go
View File

@ -126,6 +126,7 @@ var bindTests = []struct {
{"type":"function","name":"namedOutput","constant":true,"inputs":[],"outputs":[{"name":"str","type":"string"}]},
{"type":"function","name":"anonOutput","constant":true,"inputs":[],"outputs":[{"name":"","type":"string"}]},
{"type":"function","name":"namedOutputs","constant":true,"inputs":[],"outputs":[{"name":"str1","type":"string"},{"name":"str2","type":"string"}]},
{"type":"function","name":"collidingOutputs","constant":true,"inputs":[],"outputs":[{"name":"str","type":"string"},{"name":"Str","type":"string"}]},
{"type":"function","name":"anonOutputs","constant":true,"inputs":[],"outputs":[{"name":"","type":"string"},{"name":"","type":"string"}]},
{"type":"function","name":"mixedOutputs","constant":true,"inputs":[],"outputs":[{"name":"","type":"string"},{"name":"str","type":"string"}]}
]
@ -140,6 +141,7 @@ var bindTests = []struct {
str1, err = b.NamedOutput(nil)
str1, err = b.AnonOutput(nil)
res, _ := b.NamedOutputs(nil)
str1, str2, err = b.CollidingOutputs(nil)
str1, str2, err = b.AnonOutputs(nil)
str1, str2, err = b.MixedOutputs(nil)
@ -447,6 +449,66 @@ var bindTests = []struct {
}
`,
},
{
`Underscorer`,
`
contract Underscorer {
function UnderscoredOutput() constant returns (int _int, string _string) {
return (314, "pi");
}
function LowerLowerCollision() constant returns (int _res, int res) {
return (1, 2);
}
function LowerUpperCollision() constant returns (int _res, int Res) {
return (1, 2);
}
function UpperLowerCollision() constant returns (int _Res, int res) {
return (1, 2);
}
function UpperUpperCollision() constant returns (int _Res, int Res) {
return (1, 2);
}
function PurelyUnderscoredOutput() constant returns (int _, int res) {
return (1, 2);
}
function AllPurelyUnderscoredOutput() constant returns (int _, int __) {
return (1, 2);
}
}
`, `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`,
`[{"constant":true,"inputs":[],"name":"LowerUpperCollision","outputs":[{"name":"_res","type":"int256"},{"name":"Res","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"UnderscoredOutput","outputs":[{"name":"_int","type":"int256"},{"name":"_string","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PurelyUnderscoredOutput","outputs":[{"name":"_","type":"int256"},{"name":"res","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"UpperLowerCollision","outputs":[{"name":"_Res","type":"int256"},{"name":"res","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"AllPurelyUnderscoredOutput","outputs":[{"name":"_","type":"int256"},{"name":"__","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"UpperUpperCollision","outputs":[{"name":"_Res","type":"int256"},{"name":"Res","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"LowerLowerCollision","outputs":[{"name":"_res","type":"int256"},{"name":"res","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"}]`,
`
// Generate a new random account and a funded simulator
key, _ := crypto.GenerateKey()
auth := bind.NewKeyedTransactor(key)
sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}})
// Deploy a underscorer tester contract and execute a structured call on it
_, _, underscorer, err := DeployUnderscorer(auth, sim)
if err != nil {
t.Fatalf("Failed to deploy underscorer contract: %v", err)
}
sim.Commit()
// Verify that underscored return values correctly parse into structs
if res, err := underscorer.UnderscoredOutput(nil); err != nil {
t.Errorf("Failed to call constant function: %v", err)
} else if res.Int.Cmp(big.NewInt(314)) != 0 || res.String != "pi" {
t.Errorf("Invalid result, want: {314, \"pi\"}, got: %+v", res)
}
// Verify that underscored and non-underscored name collisions force tuple outputs
var a, b *big.Int
a, b, _ = underscorer.LowerLowerCollision(nil)
a, b, _ = underscorer.LowerUpperCollision(nil)
a, b, _ = underscorer.UpperLowerCollision(nil)
a, b, _ = underscorer.UpperUpperCollision(nil)
a, b, _ = underscorer.PurelyUnderscoredOutput(nil)
a, b, _ = underscorer.AllPurelyUnderscoredOutput(nil)
fmt.Println(a, b, err)
`,
},
}
// Tests that packages generated by the binder can be successfully compiled and

45
accounts/abi/unpack_test.go
View File

@ -259,6 +259,51 @@ var unpackTests = []unpackTest{
enc: "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
want: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
},
// struct outputs
{
def: `[{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}]`,
enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
want: struct {
Int1 *big.Int
Int2 *big.Int
}{big.NewInt(1), big.NewInt(2)},
},
{
def: `[{"name":"int","type":"int256"},{"name":"Int","type":"int256"}]`,
enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
want: struct {
Int1 *big.Int
Int2 *big.Int
}{},
err: "abi: multiple outputs mapping to the same struct field 'Int'",
},
{
def: `[{"name":"int","type":"int256"},{"name":"_int","type":"int256"}]`,
enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
want: struct {
Int1 *big.Int
Int2 *big.Int
}{},
err: "abi: multiple outputs mapping to the same struct field 'Int'",
},
{
def: `[{"name":"Int","type":"int256"},{"name":"_int","type":"int256"}]`,
enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
want: struct {
Int1 *big.Int
Int2 *big.Int
}{},
err: "abi: multiple outputs mapping to the same struct field 'Int'",
},
{
def: `[{"name":"Int","type":"int256"},{"name":"_","type":"int256"}]`,
enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
want: struct {
Int1 *big.Int
Int2 *big.Int
}{},
err: "abi: purely underscored output cannot unpack to struct",
},
}
func TestUnpack(t *testing.T) {