path: root/cmd/abigen/main.go

// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "encoding/json"
    "flag"
    "fmt"
    "io/ioutil"
    "os"
    "strings"

    "github.com/ethereum/go-ethereum/accounts/abi/bind"
    "github.com/ethereum/go-ethereum/common/compiler"
)

var (
    abiFlag = flag.String("abi", "", "Path to the Ethereum contract ABI json to bind, - for STDIN")
    binFlag = flag.String("bin", "", "Path to the Ethereum contract bytecode (generate deploy method)")
    typFlag = flag.String("type", "", "Struct name for the binding (default = package name)")

    solFlag  = flag.String("sol", "", "Path to the Ethereum contract Solidity source to build and bind")
    solcFlag = flag.String("solc", "solc", "Solidity compiler to use if source builds are requested")
    excFlag  = flag.String("exc", "", "Comma separated types to exclude from binding")

    pkgFlag  = flag.String("pkg", "", "Package name to generate the binding into")
    outFlag  = flag.String("out", "", "Output file for the generated binding (default = stdout)")
    langFlag = flag.String("lang", "go", "Destination language for the bindings (go, java, objc)")
)

func main() {
    // Parse and ensure all needed inputs are specified
    flag.Parse()

    if *abiFlag == "" && *solFlag == "" {
        fmt.Printf("No contract ABI (--abi) or Solidity source (--sol) specified\n")
        os.Exit(-1)
    } else if (*abiFlag != "" || *binFlag != "" || *typFlag != "") && *solFlag != "" {
        fmt.Printf("Contract ABI (--abi), bytecode (--bin) and type (--type) flags are mutually exclusive with the Solidity source (--sol) flag\n")
        os.Exit(-1)
    }
    if *pkgFlag == "" {
        fmt.Printf("No destination package specified (--pkg)\n")
        os.Exit(-1)
    }
    var lang bind.Lang
    switch *langFlag {
    case "go":
        lang = bind.LangGo
    case "java":
        lang = bind.LangJava
    case "objc":
        lang = bind.LangObjC
    default:
        fmt.Printf("Unsupported destination language \"%s\" (--lang)\n", *langFlag)
        os.Exit(-1)
    }
    // If the entire solidity code was specified, build and bind based on that
    var (
        abis  []string
        bins  []string
        types []string
    )
    if *solFlag != "" || (*abiFlag == "-" && *pkgFlag == "") {
        // Generate the list of types to exclude from binding
        exclude := make(map[string]bool)
        for _, kind := range strings.Split(*excFlag, ",") {
            exclude[strings.ToLower(kind)] = true
        }

        var contracts map[string]*compiler.Contract
        var err error
        if *solFlag != "" {
            contracts, err = compiler.CompileSolidity(*solcFlag, *solFlag)
            if err != nil {
                fmt.Printf("Failed to build Solidity contract: %v\n", err)
                os.Exit(-1)
            }
        } else {
            contracts, err = contractsFromStdin()
            if err != nil {
                fmt.Printf("Failed to read input ABIs from STDIN: %v\n", err)
                os.Exit(-1)
            }
        }
        // Gather all non-excluded contract for binding
        for name, contract := range contracts {
            if exclude[strings.ToLower(name)] {
                continue
            }
            abi, _ := json.Marshal(contract.Info.AbiDefinition) // Flatten the compiler parse
            abis = append(abis, string(abi))
            bins = append(bins, contract.Code)

            nameParts := strings.Split(name, ":")
            types = append(types, nameParts[len(nameParts)-1])
        }
    } else {
        // Otherwise load up the ABI, optional bytecode and type name from the parameters
        var abi []byte
        var err error
        if *abiFlag == "-" {
            abi, err = ioutil.ReadAll(os.Stdin)
        } else {
            abi, err = ioutil.ReadFile(*abiFlag)
        }
        if err != nil {
            fmt.Printf("Failed to read input ABI: %v\n", err)
            os.Exit(-1)
        }
        abis = append(abis, string(abi))

        bin := []byte{}
        if *binFlag != "" {
            if bin, err = ioutil.ReadFile(*binFlag); err != nil {
                fmt.Printf("Failed to read input bytecode: %v\n", err)
                os.Exit(-1)
            }
        }
        bins = append(bins, string(bin))

        kind := *typFlag
        if kind == "" {
            kind = *pkgFlag
        }
        types = append(types, kind)
    }
    // Generate the contract binding
    code, err := bind.Bind(types, abis, bins, *pkgFlag, lang)
    if err != nil {
        fmt.Printf("Failed to generate ABI binding: %v\n", err)
        os.Exit(-1)
    }
    // Either flush it out to a file or display on the standard output
    if *outFlag == "" {
        fmt.Printf("%s\n", code)
        return
    }
    if err := ioutil.WriteFile(*outFlag, []byte(code), 0600); err != nil {
        fmt.Printf("Failed to write ABI binding: %v\n", err)
        os.Exit(-1)
    }
}

func contractsFromStdin() (map[string]*compiler.Contract, error) {
    bytes, err := ioutil.ReadAll(os.Stdin)
    if err != nil {
        return nil, err
    }
    return compiler.ParseCombinedJSON(bytes, "", "", "", "")
}