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accounts/abi: allow overloaded argument names (#21060)

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* accounts/abi: allow overloaded argument names

In solidity it is possible to create the following contract:
```
contract Overloader {
    struct F { uint _f; uint __f; uint f; }
    function f(F memory f) public {}
}
```
This however resulted in a panic in the abi package.

* accounts/abi fixed error handling
This commit is contained in:
Marius van der Wijden 2020-05-12 13:02:23 +02:00 committed by GitHub
parent b8ea9042e5
commit 0b63915430
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 28 additions and 5 deletions
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10
accounts/abi/abi_test.go
View File

@ -57,7 +57,8 @@ const jsondata = `
{ "type" : "function", "name" : "fixedArrBytes", "stateMutability" : "view", "inputs" : [ { "name" : "bytes", "type" : "bytes" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] },
{ "type" : "function", "name" : "mixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type" : "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" } ] },
{ "type" : "function", "name" : "doubleFixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type" : "uint256[2]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] },
{ "type" : "function", "name" : "multipleMixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type" : "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] }
{ "type" : "function", "name" : "multipleMixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type" : "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] },
{ "type" : "function", "name" : "overloadedNames", "stateMutability" : "view", "inputs": [ { "components": [ { "internalType": "uint256", "name": "_f", "type": "uint256" }, { "internalType": "uint256", "name": "__f", "type": "uint256"}, { "internalType": "uint256", "name": "f", "type": "uint256"}],"internalType": "struct Overloader.F", "name": "f","type": "tuple"}]}
]`
var (
@ -80,6 +81,10 @@ var (
Uint256ArrNested, _ = NewType("uint256[2][2]", "", nil)
Uint8ArrNested, _ = NewType("uint8[][2]", "", nil)
Uint8SliceNested, _ = NewType("uint8[][]", "", nil)
TupleF, _ = NewType("tuple", "struct Overloader.F", []ArgumentMarshaling{
{Name: "_f", Type: "uint256"},
{Name: "__f", Type: "uint256"},
{Name: "f", Type: "uint256"}})
)
var methods = map[string]Method{
@ -108,6 +113,7 @@ var methods = map[string]Method{
"mixedArrStr": NewMethod("mixedArrStr", "mixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr", Uint256Arr2, false}, {"dynArr", Uint256Arr, false}}, nil),
"doubleFixedArrStr": NewMethod("doubleFixedArrStr", "doubleFixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr1", Uint256Arr2, false}, {"fixedArr2", Uint256Arr3, false}}, nil),
"multipleMixedArrStr": NewMethod("multipleMixedArrStr", "multipleMixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr1", Uint256Arr2, false}, {"dynArr", Uint256Arr, false}, {"fixedArr2", Uint256Arr3, false}}, nil),
"overloadedNames": NewMethod("overloadedNames", "overloadedNames", Function, "view", false, false, []Argument{{"f", TupleF, false}}, nil),
}
func TestReader(t *testing.T) {
@ -117,7 +123,7 @@ func TestReader(t *testing.T) {
exp, err := JSON(strings.NewReader(jsondata))
if err != nil {
t.Error(err)
t.Fatal(err)
}
for name, expM := range exp.Methods {

23
accounts/abi/type.go
View File

@ -163,16 +163,19 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
expression string // canonical parameter expression
)
expression += "("
overloadedNames := make(map[string]string)
for idx, c := range components {
cType, err := NewType(c.Type, c.InternalType, c.Components)
if err != nil {
return Type{}, err
}
if ToCamelCase(c.Name) == "" {
return Type{}, errors.New("abi: purely anonymous or underscored field is not supported")
fieldName, err := overloadedArgName(c.Name, overloadedNames)
if err != nil {
return Type{}, err
}
overloadedNames[fieldName] = fieldName
fields = append(fields, reflect.StructField{
Name: ToCamelCase(c.Name), // reflect.StructOf will panic for any exported field.
Name: fieldName, // reflect.StructOf will panic for any exported field.
Type: cType.getType(),
Tag: reflect.StructTag("json:\"" + c.Name + "\""),
})
@ -246,6 +249,20 @@ func (t Type) getType() reflect.Type {
}
}
func overloadedArgName(rawName string, names map[string]string) (string, error) {
fieldName := ToCamelCase(rawName)
if fieldName == "" {
return "", errors.New("abi: purely anonymous or underscored field is not supported")
}
// Handle overloaded fieldNames
_, ok := names[fieldName]
for idx := 0; ok; idx++ {
fieldName = fmt.Sprintf("%s%d", ToCamelCase(rawName), idx)
_, ok = names[fieldName]
}
return fieldName, nil
}
// String implements Stringer
func (t Type) String() (out string) {
return t.stringKind