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// Copyright 2015 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 compiler wraps the Solidity compiler executable (solc).
package compiler
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"regexp"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
var (
versionRegexp = regexp.MustCompile("[0-9]+\\.[0-9]+\\.[0-9]+")
solcParams = []string{
"--combined-json", "bin,abi,userdoc,devdoc",
"--add-std", // include standard lib contracts
"--optimize", // code optimizer switched on
}
)
type Contract struct {
Code string `json:"code"`
Info ContractInfo `json:"info"`
}
type ContractInfo struct {
Source string `json:"source"`
Language string `json:"language"`
LanguageVersion string `json:"languageVersion"`
CompilerVersion string `json:"compilerVersion"`
CompilerOptions string `json:"compilerOptions"`
AbiDefinition interface{} `json:"abiDefinition"`
UserDoc interface{} `json:"userDoc"`
DeveloperDoc interface{} `json:"developerDoc"`
}
// Solidity contains information about the solidity compiler.
type Solidity struct {
Path, Version, FullVersion string
}
// --combined-output format
type solcOutput struct {
Contracts map[string]struct{ Bin, Abi, Devdoc, Userdoc string }
Version string
}
// SolidityVersion runs solc and parses its version output.
func SolidityVersion(solc string) (*Solidity, error) {
if solc == "" {
solc = "solc"
}
var out bytes.Buffer
cmd := exec.Command(solc, "--version")
cmd.Stdout = &out
if err := cmd.Run(); err != nil {
return nil, err
}
s := &Solidity{
Path: cmd.Path,
FullVersion: out.String(),
Version: versionRegexp.FindString(out.String()),
}
return s, nil
}
// CompileSolidityString builds and returns all the contracts contained within a source string.
func CompileSolidityString(solc, source string) (map[string]*Contract, error) {
if len(source) == 0 {
return nil, errors.New("solc: empty source string")
}
if solc == "" {
solc = "solc"
}
// Write source to a temporary file. Compiling stdin used to be supported
// but seems to produce an exception with solc 0.3.5.
infile, err := ioutil.TempFile("", "geth-compile-solidity")
if err != nil {
return nil, err
}
defer os.Remove(infile.Name())
if _, err := io.WriteString(infile, source); err != nil {
return nil, err
}
if err := infile.Close(); err != nil {
return nil, err
}
return CompileSolidity(solc, infile.Name())
}
// CompileSolidity compiles all given Solidity source files.
func CompileSolidity(solc string, sourcefiles ...string) (map[string]*Contract, error) {
if len(sourcefiles) == 0 {
return nil, errors.New("solc: no source ")
}
source, err := slurpFiles(sourcefiles)
if err != nil {
return nil, err
}
if solc == "" {
solc = "solc"
}
var stderr, stdout bytes.Buffer
args := append(solcParams, "--")
cmd := exec.Command(solc, append(args, sourcefiles...)...)
cmd.Stderr = &stderr
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("solc: %v\n%s", err, stderr.Bytes())
}
var output solcOutput
if err := json.Unmarshal(stdout.Bytes(), &output); err != nil {
return nil, err
}
shortVersion := versionRegexp.FindString(output.Version)
// Compilation succeeded, assemble and return the contracts.
contracts := make(map[string]*Contract)
for name, info := range output.Contracts {
// Parse the individual compilation results.
var abi interface{}
if err := json.Unmarshal([]byte(info.Abi), &abi); err != nil {
return nil, fmt.Errorf("solc: error reading abi definition (%v)", err)
}
var userdoc interface{}
if err := json.Unmarshal([]byte(info.Userdoc), &userdoc); err != nil {
return nil, fmt.Errorf("solc: error reading user doc: %v", err)
}
var devdoc interface{}
if err := json.Unmarshal([]byte(info.Devdoc), &devdoc); err != nil {
return nil, fmt.Errorf("solc: error reading dev doc: %v", err)
}
contracts[name] = &Contract{
Code: "0x" + info.Bin,
Info: ContractInfo{
Source: source,
Language: "Solidity",
LanguageVersion: shortVersion,
CompilerVersion: shortVersion,
CompilerOptions: strings.Join(solcParams, " "),
AbiDefinition: abi,
UserDoc: userdoc,
DeveloperDoc: devdoc,
},
}
}
return contracts, nil
}
func slurpFiles(files []string) (string, error) {
var concat bytes.Buffer
for _, file := range files {
content, err := ioutil.ReadFile(file)
if err != nil {
return "", err
}
concat.Write(content)
}
return concat.String(), nil
}
// SaveInfo serializes info to the given file and returns its Keccak256 hash.
func SaveInfo(info *ContractInfo, filename string) (common.Hash, error) {
infojson, err := json.Marshal(info)
if err != nil {
return common.Hash{}, err
}
contenthash := common.BytesToHash(crypto.Keccak256(infojson))
return contenthash, ioutil.WriteFile(filename, infojson, 0600)
}
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