/
solc.go
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/
solc.go
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package web3
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
)
var versionRegexp = regexp.MustCompile(`([0-9]+)\.([0-9]+)\.([0-9]+)`)
// Contract contains information about a compiled contract, alongside its code and runtime code.
type Contract struct {
Code string `json:"code"`
RuntimeCode string `json:"runtime-code"`
Info ContractInfo `json:"info"`
}
// ContractInfo contains information about a compiled contract, including access
// to the ABI definition, source mapping, user and developer docs, and metadata.
//
// Depending on the source, language version, compiler version, and compiler
// options will provide information about how the contract was compiled.
type ContractInfo struct {
Source string `json:"source"`
Language string `json:"language"`
LanguageVersion string `json:"languageVersion"`
CompilerVersion string `json:"compilerVersion"`
CompilerOptions string `json:"compilerOptions"`
SrcMap string `json:"srcMap"`
SrcMapRuntime string `json:"srcMapRuntime"`
AbiDefinition interface{} `json:"abiDefinition"`
UserDoc interface{} `json:"userDoc"`
DeveloperDoc interface{} `json:"developerDoc"`
Metadata string `json:"metadata"`
}
// Solidity specifies the solidity compiler configuration.
type Solidity struct {
Path, Version, EVMVersion string
Major, Minor, Patch int
Optimize bool
}
// --combined-output format
type solcOutput struct {
Contracts map[string]struct {
BinRuntime string `json:"bin-runtime"`
SrcMapRuntime string `json:"srcmap-runtime"`
Bin, SrcMap, Abi, Devdoc, Userdoc, Metadata string
}
Version string
}
func (s *Solidity) makeArgs() ([]string, error) {
dir, err := os.Getwd()
if err != nil {
return nil, err
}
args := []string{
"run", "-i", "--rm", "-v", dir + ":/workdir", "-w", "/workdir", "ethereum/solc:" + s.Version,
"--combined-json",
"bin,bin-runtime,srcmap,srcmap-runtime,abi,userdoc,devdoc,metadata",
"--evm-version", s.EVMVersion,
}
if s.Optimize {
args = append(args, "--optimize")
}
return args, nil
}
// SolidityVersion runs solc and parses its version output.
func SolidityVersion(source string) (*Solidity, error) {
var err error
matches := versionRegexp.FindStringSubmatch(source)
if len(matches) != 4 {
return nil, fmt.Errorf("can't parse solc version %q", source)
}
s := &Solidity{Path: "docker"}
if s.Major, err = strconv.Atoi(matches[1]); err != nil {
return nil, err
}
if s.Minor, err = strconv.Atoi(matches[2]); err != nil {
return nil, err
}
if s.Patch, err = strconv.Atoi(matches[3]); err != nil {
return nil, err
}
s.Version = strconv.Itoa(s.Major) + "." + strconv.Itoa(s.Minor) + "." + strconv.Itoa(s.Patch)
return s, nil
}
// CompileSolidityString builds and returns all the contracts contained within a source string.
func CompileSolidityString(ctx context.Context, source, solcVersion, evmVersion string, optimize bool) (map[string]*Contract, error) {
var s *Solidity
var err error
if len(source) == 0 {
return nil, errors.New("solc: empty source string")
}
if solcVersion != "" {
s = &Solidity{Path: "docker", Version: solcVersion}
} else {
s, err = SolidityVersion(source)
if err != nil {
return nil, err
}
}
// fmt.Printf("Building with solidity version %v\n", s.Version)
s.EVMVersion = evmVersion
s.Optimize = optimize
args, err := s.makeArgs()
if err != nil {
return nil, err
}
args = append(args, "--", "-")
cmd := exec.CommandContext(ctx, s.Path, args...)
cmd.Stdin = strings.NewReader(source)
return s.run(cmd, source)
}
func (s *Solidity) run(cmd *exec.Cmd, source string) (map[string]*Contract, error) {
var stderr, stdout bytes.Buffer
cmd.Stderr = &stderr
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("solc: %v\n%s", err, stderr.Bytes())
}
args, err := s.makeArgs()
if err != nil {
return nil, err
}
return ParseCombinedJSON(stdout.Bytes(), source, s.Version, s.Version, strings.Join(args, " "))
}
func ParseCombinedJSON(combinedJSON []byte, source string, languageVersion string, compilerVersion string, compilerOptions string) (map[string]*Contract, error) {
var output solcOutput
if err := json.Unmarshal(combinedJSON, &output); err != nil {
return nil, err
}
// 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,
RuntimeCode: "0x" + info.BinRuntime,
Info: ContractInfo{
Source: source,
Language: "Solidity",
LanguageVersion: languageVersion,
CompilerVersion: compilerVersion,
CompilerOptions: compilerOptions,
SrcMap: info.SrcMap,
SrcMapRuntime: info.SrcMapRuntime,
AbiDefinition: abi,
UserDoc: userdoc,
DeveloperDoc: devdoc,
Metadata: info.Metadata,
},
}
}
return contracts, nil
}