path: root/common/compiler/solidity.go

package compiler

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "os"
    "os/exec"
    "path/filepath"
    "regexp"
    "strings"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
)

const (
    flair           = "Christian <c@ethdev.com> and Lefteris <lefteris@ethdev.com> (c) 2014-2015"
    languageVersion = "0"
)

var (
    versionRegExp = regexp.MustCompile("[0-9]+.[0-9]+.[0-9]+")
    params        = []string{
        "--binary",       // Request to output the contract in binary (hexadecimal).
        "file",           //
        "--json-abi",     // Request to output the contract's JSON ABI interface.
        "file",           //
        "--natspec-user", // Request to output the contract's Natspec user documentation.
        "file",           //
        "--natspec-dev",  // Request to output the contract's Natspec developer documentation.
        "file",
    }
)

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"`
    AbiDefinition   interface{} `json:"abiDefinition"`
    UserDoc         interface{} `json:"userDoc"`
    DeveloperDoc    interface{} `json:"developerDoc"`
}

type Solidity struct {
    solcPath string
    version  string
}

func New(solcPath string) (sol *Solidity, err error) {
    // set default solc
    if len(solcPath) == 0 {
        solcPath = "solc"
    }
    solcPath, err = exec.LookPath(solcPath)
    if err != nil {
        return
    }

    cmd := exec.Command(solcPath, "--version")
    var out bytes.Buffer
    cmd.Stdout = &out
    err = cmd.Run()
    if err != nil {
        return
    }

    version := versionRegExp.FindString(out.String())
    sol = &Solidity{
        solcPath: solcPath,
        version:  version,
    }
    glog.V(logger.Info).Infoln(sol.Info())
    return
}

func (sol *Solidity) Info() string {
    return fmt.Sprintf("solc v%s\nSolidity Compiler: %s\n%s", sol.version, sol.solcPath, flair)
}

func (sol *Solidity) Version() string {
    return sol.version
}

func (sol *Solidity) Compile(source string) (contract *Contract, err error) {

    if len(source) == 0 {
        err = fmt.Errorf("empty source")
        return
    }

    wd, err := ioutil.TempDir("", "solc")
    if err != nil {
        return
    }
    defer os.RemoveAll(wd)

    in := strings.NewReader(source)
    var out bytes.Buffer
    // cwd set to temp dir
    cmd := exec.Command(sol.solcPath, params...)
    cmd.Dir = wd
    cmd.Stdin = in
    cmd.Stdout = &out
    err = cmd.Run()
    if err != nil {
        err = fmt.Errorf("solc error: %v", err)
        return
    }

    matches, _ := filepath.Glob(wd + "/*.binary")
    if len(matches) < 1 {
        err = fmt.Errorf("solc error: missing code output")
        return
    }
    if len(matches) > 1 {
        err = fmt.Errorf("multi-contract sources are not supported")
        return
    }
    _, file := filepath.Split(matches[0])
    base := strings.Split(file, ".")[0]

    codeFile := filepath.Join(wd, base+".binary")
    abiDefinitionFile := filepath.Join(wd, base+".abi")
    userDocFile := filepath.Join(wd, base+".docuser")
    developerDocFile := filepath.Join(wd, base+".docdev")

    code, err := ioutil.ReadFile(codeFile)
    if err != nil {
        err = fmt.Errorf("error reading compiler output for code: %v", err)
        return
    }
    abiDefinitionJson, err := ioutil.ReadFile(abiDefinitionFile)
    if err != nil {
        err = fmt.Errorf("error reading compiler output for abiDefinition: %v", err)
        return
    }
    var abiDefinition interface{}
    err = json.Unmarshal(abiDefinitionJson, &abiDefinition)

    userDocJson, err := ioutil.ReadFile(userDocFile)
    if err != nil {
        err = fmt.Errorf("error reading compiler output for userDoc: %v", err)
        return
    }
    var userDoc interface{}
    err = json.Unmarshal(userDocJson, &userDoc)

    developerDocJson, err := ioutil.ReadFile(developerDocFile)
    if err != nil {
        err = fmt.Errorf("error reading compiler output for developerDoc: %v", err)
        return
    }
    var developerDoc interface{}
    err = json.Unmarshal(developerDocJson, &developerDoc)

    contract = &Contract{
        Code: "0x" + string(code),
        Info: ContractInfo{
            Source:          source,
            Language:        "Solidity",
            LanguageVersion: languageVersion,
            CompilerVersion: sol.version,
            AbiDefinition:   abiDefinition,
            UserDoc:         userDoc,
            DeveloperDoc:    developerDoc,
        },
    }

    return
}

func ExtractInfo(contract *Contract, filename string) (contenthash common.Hash, err error) {
    contractInfo, err := json.Marshal(contract.Info)
    if err != nil {
        return
    }
    contenthash = common.BytesToHash(crypto.Sha3(contractInfo))
    err = ioutil.WriteFile(filename, contractInfo, 0600)
    return
}