github.com/ethereum/go-ethereum@v1.16.1/accounts/abi/error_handling.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package abi
    18  
    19  import (
    20  	"errors"
    21  	"fmt"
    22  	"reflect"
    23  )
    24  
    25  var (
    26  	errBadBool     = errors.New("abi: improperly encoded boolean value")
    27  	errBadUint8    = errors.New("abi: improperly encoded uint8 value")
    28  	errBadUint16   = errors.New("abi: improperly encoded uint16 value")
    29  	errBadUint32   = errors.New("abi: improperly encoded uint32 value")
    30  	errBadUint64   = errors.New("abi: improperly encoded uint64 value")
    31  	errBadInt8     = errors.New("abi: improperly encoded int8 value")
    32  	errBadInt16    = errors.New("abi: improperly encoded int16 value")
    33  	errBadInt32    = errors.New("abi: improperly encoded int32 value")
    34  	errBadInt64    = errors.New("abi: improperly encoded int64 value")
    35  	errInvalidSign = errors.New("abi: negatively-signed value cannot be packed into uint parameter")
    36  )
    37  
    38  // formatSliceString formats the reflection kind with the given slice size
    39  // and returns a formatted string representation.
    40  func formatSliceString(kind reflect.Kind, sliceSize int) string {
    41  	if sliceSize == -1 {
    42  		return fmt.Sprintf("[]%v", kind)
    43  	}
    44  	return fmt.Sprintf("[%d]%v", sliceSize, kind)
    45  }
    46  
    47  // sliceTypeCheck checks that the given slice can by assigned to the reflection
    48  // type in t.
    49  func sliceTypeCheck(t Type, val reflect.Value) error {
    50  	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
    51  		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
    52  	}
    53  
    54  	if t.T == ArrayTy && val.Len() != t.Size {
    55  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
    56  	}
    57  
    58  	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
    59  		if val.Len() > 0 {
    60  			return sliceTypeCheck(*t.Elem, val.Index(0))
    61  		}
    62  	}
    63  
    64  	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
    65  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
    66  	}
    67  	return nil
    68  }
    69  
    70  // typeCheck checks that the given reflection value can be assigned to the reflection
    71  // type in t.
    72  func typeCheck(t Type, value reflect.Value) error {
    73  	if t.T == SliceTy || t.T == ArrayTy {
    74  		return sliceTypeCheck(t, value)
    75  	}
    76  
    77  	// Check base type validity. Element types will be checked later on.
    78  	if t.GetType().Kind() != value.Kind() {
    79  		return typeErr(t.GetType().Kind(), value.Kind())
    80  	} else if t.T == FixedBytesTy && t.Size != value.Len() {
    81  		return typeErr(t.GetType(), value.Type())
    82  	} else {
    83  		return nil
    84  	}
    85  }
    86  
    87  // typeErr returns a formatted type casting error.
    88  func typeErr(expected, got interface{}) error {
    89  	return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
    90  }