forked from mirror/go-ethereum
accounts/abi: add basic support for error types (#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 #23157verkle/onleaf
Marius van der Wijden
3 years ago
committed by
GitHub
parent
011fe3eb5e
commit
08e782c61f
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package abi |
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import ( |
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"errors" |
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"fmt" |
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"reflect" |
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) |
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var ( |
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errBadBool = errors.New("abi: improperly encoded boolean value") |
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) |
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// formatSliceString formats the reflection kind with the given slice size
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// and returns a formatted string representation.
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func formatSliceString(kind reflect.Kind, sliceSize int) string { |
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if sliceSize == -1 { |
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return fmt.Sprintf("[]%v", kind) |
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} |
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return fmt.Sprintf("[%d]%v", sliceSize, kind) |
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} |
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// sliceTypeCheck checks that the given slice can by assigned to the reflection
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// type in t.
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func sliceTypeCheck(t Type, val reflect.Value) error { |
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if val.Kind() != reflect.Slice && val.Kind() != reflect.Array { |
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return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type()) |
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} |
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if t.T == ArrayTy && val.Len() != t.Size { |
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return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len())) |
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} |
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if t.Elem.T == SliceTy || t.Elem.T == ArrayTy { |
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if val.Len() > 0 { |
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return sliceTypeCheck(*t.Elem, val.Index(0)) |
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} |
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} |
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if val.Type().Elem().Kind() != t.Elem.GetType().Kind() { |
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return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type()) |
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} |
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return nil |
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} |
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// typeCheck checks that the given reflection value can be assigned to the reflection
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// type in t.
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func typeCheck(t Type, value reflect.Value) error { |
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if t.T == SliceTy || t.T == ArrayTy { |
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return sliceTypeCheck(t, value) |
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} |
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// Check base type validity. Element types will be checked later on.
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if t.GetType().Kind() != value.Kind() { |
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return typeErr(t.GetType().Kind(), value.Kind()) |
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} else if t.T == FixedBytesTy && t.Size != value.Len() { |
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return typeErr(t.GetType(), value.Type()) |
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} else { |
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return nil |
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} |
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} |
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// typeErr returns a formatted type casting error.
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func typeErr(expected, got interface{}) error { |
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return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected) |
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} |
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