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accounts/abi: add basic support for error types (ethereum#23161)
This is the initial step for support of Solidity errors in contract bindings. As of this change, errors can be decoded, but are not supported in bindings yet. Closes ethereum#23157
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // Copyright 2016 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package abi | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "reflect" | ||
| ) | ||
|
|
||
| var ( | ||
| errBadBool = errors.New("abi: improperly encoded boolean value") | ||
| ) | ||
|
|
||
| // formatSliceString formats the reflection kind with the given slice size | ||
| // and returns a formatted string representation. | ||
| func formatSliceString(kind reflect.Kind, sliceSize int) string { | ||
| if sliceSize == -1 { | ||
| return fmt.Sprintf("[]%v", kind) | ||
| } | ||
| return fmt.Sprintf("[%d]%v", sliceSize, kind) | ||
| } | ||
|
|
||
| // sliceTypeCheck checks that the given slice can by assigned to the reflection | ||
| // type in t. | ||
| func sliceTypeCheck(t Type, val reflect.Value) error { | ||
| if val.Kind() != reflect.Slice && val.Kind() != reflect.Array { | ||
| return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type()) | ||
| } | ||
|
|
||
| if t.T == ArrayTy && val.Len() != t.Size { | ||
| return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len())) | ||
| } | ||
|
|
||
| if t.Elem.T == SliceTy || t.Elem.T == ArrayTy { | ||
| if val.Len() > 0 { | ||
| return sliceTypeCheck(*t.Elem, val.Index(0)) | ||
| } | ||
| } | ||
|
|
||
| if val.Type().Elem().Kind() != t.Elem.GetType().Kind() { | ||
| return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type()) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // typeCheck checks that the given reflection value can be assigned to the reflection | ||
| // type in t. | ||
| func typeCheck(t Type, value reflect.Value) error { | ||
| if t.T == SliceTy || t.T == ArrayTy { | ||
| return sliceTypeCheck(t, value) | ||
| } | ||
|
|
||
| // Check base type validity. Element types will be checked later on. | ||
| if t.GetType().Kind() != value.Kind() { | ||
| return typeErr(t.GetType().Kind(), value.Kind()) | ||
| } else if t.T == FixedBytesTy && t.Size != value.Len() { | ||
| return typeErr(t.GetType(), value.Type()) | ||
| } else { | ||
| return nil | ||
| } | ||
|
|
||
| } | ||
|
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| // typeErr returns a formatted type casting error. | ||
| func typeErr(expected, got interface{}) error { | ||
| return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected) | ||
| } |