golang智能合约

Go语言调用智能合约
Windows环境下安装gcc环境,参见windows搭建gcc开发环境
用Go来做以太坊开发③交易
用Go来做以太坊开发④智能合约
用Go来做以太坊开发⑤事件日志
使用Go与以太坊智能合约交互

一、win开发环境

git clone https://github.com/ethereum/go-ethereum.git
找到包的安装路径:github.com/ethereum/go-ethereum/cmd/abigen
go build -i 生成 abigen.exe
使用abigen将abi翻译成go(最好先将abigen.exe拷贝到$PATH的某个路径下)
abigen –abi xx.abi –pkg pkgname –type apiname –out xx.go

二、合并合约

https://github.com/BlockCatIO/solidity-flattener
https://github.com/coburncoburn/SolidityFlattery.
etherscan上验证合约步骤

$ git clone https://github.com/coburncoburn/SolidityFlattery.git
$ cd SolidityFlattery
$ go get gopkg.in/natefinch/lumberjack.v2
$ go build flat.go utils.go
$ go install flat.go utils.go

$ flat –input TPToken.sol –output verify
过程中可以看到只需要输入TPToken.sol,flat就会自动寻找其依赖的合约。
其中verify为输出文件的名字,可以根据自己习惯设置。
输出文件有两个; verify.log, verify.sol,其中verify.sol就是合并好的用来在etherscan上验证的合约

三、go合约调用

  1. 连接eth节点

import(
"github.com/ethereum/go-ethereum/ethclient"
 store "exch/contracts" 
)
//ethclient连接
client, err := ethclient.Dial("https://jsonrpc.medishares.net")
    if err != nil {
        fmt.Println("Failed to Dial ", err)
        return
    }
defer client.Close()

四、订阅事件日志

import (
    "context"
    "fmt"
    "log"
    "github.com/ethereum/go-ethereum"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/ethclient")func main() {
    client, err := ethclient.Dial("wss://rinkeby.infura.io/ws")
    if err != nil {
        log.Fatal(err)
    }
    contractAddress := common.HexToAddress("0x147B8eb97fD247D06C4006D269c90C1908Fb5D54")
    query := ethereum.FilterQuery{
        Addresses: []common.Address{contractAddress},
    }
    logs := make(chan types.Log)
    sub, err := client.SubscribeFilterLogs(context.Background(), query, logs)
    if err != nil {
        log.Fatal(err)
    }
    for {
        select {
        case err := <-sub.Err():
            log.Fatal(err)
        case vLog := <-logs:
            fmt.Println(vLog) // pointer to event log
        }
    }}

作者:证始
链接:https://www.jianshu.com/p/c58303c5410e
来源:简书
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