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types.go
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types.go
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// Copyright 2017 Monax Industries Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package abi
import "github.com/hyperledger/burrow/execution/evm/sha3"
// Ethereum defines types and calling conventions for the ABI
// (application binary interface) here: https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
// We make a start of representing them here
// We use TypeName rather than Type to reserve 'Type' for a possible future
// ABI type the can hold an ABI-native type mapping
type TypeName string
type Arg struct {
Name string
TypeName TypeName
}
type Return struct {
Name string
TypeName TypeName
}
const (
// We don't need to be exhaustive here, just make what we used strongly typed
AddressTypeName TypeName = "address"
IntTypeName TypeName = "int"
Uint64TypeName TypeName = "uint64"
Bytes32TypeName TypeName = "bytes32"
StringTypeName TypeName = "string"
BoolTypeName TypeName = "bool"
)
const (
FunctionSelectorLength = 4
AddressLength = 20
)
type (
Address [AddressLength]byte
FunctionSelector [FunctionSelectorLength]byte
)
func FunctionID(signature string) FunctionSelector {
return FirstFourBytes(sha3.Sha3([]byte(signature)))
}
func FirstFourBytes(byteSlice []byte) [4]byte {
var bs [4]byte
copy(bs[:], byteSlice[:4])
return bs
}