2.Go SDK使用说明

2.1 简介

星火链网官方并没有提供Golang语言的SDK，开源社区的开发者贡献了基础版本的Golang语言SDK供大家使用，官方建议优先选择Java或者Nodejs版本的SDK。

2.2 环境准备

2.2.1 软件依赖

golang ：版本为1.16或以上

下载地址：https://golang.org/dl/

若已安装，请通过命令查看版本：

$ go version
go version go1.16 linux/amd64

2.2.2 下载安装

$ git clone -b main  --depth=1 http://github.com/caict-4iot-dev/BIF-Core-SDK-Go.git

2.3 怎么使用SDK

2.3.1 SDK 离线API

离线API主要是账户和密码学相关API, 不需要连接星火链网RPC接口也能工作. 主要接口如下:

账户生成

接口 key.GetBidAndKeyPair()
用途:

用来生成一个星火链bid地址和对应私钥

示例

import (
"github.com/caict-4iot-dev/BIF-Core-SDK-Go/module/encryption/key"
)
    
    keyPair, err := GetBidAndKeyPair()
    if err != nil {
        t.Error(err)
	}
    encAddress := keyPair.GetEncAddress()
    encPublicKey := keyPair.GetEncPublicKey()
    encPrivateKey := keyPair.GetEncPrivateKey()
    rawPublicKey := keyPair.GetRawPublicKey()
    rawPrivateKey := keyPair.GetRawPrivateKey()

加密私钥生成keystore

接口 key.GenerateKeyStore(encPrivateKey, password, n, r, p, version)
用途:

用一个密码来加密保护私钥, 得到一个json表示的keystore, 对应密码不泄露的情况下, 可以公开保存.

示例

import (
"github.com/caict-4iot-dev/BIF-Core-SDK-Go/module/encryption/key"
)

    encPrivateKey := "priSPKrR4w6H89kRXaC2XZT5Lmj7XoCoBdvTuv7ySXSCDDGaZZ"
    password := "123456"
    n := 16384
    r := 8
    p := 1
    version := 32
    encPrivateKey, keyStore := key.GenerateKeyStore(encPrivateKey, password, n, r, p, version)
    dataByte, err := json.Marshal(keyStore)
    if err != nil {
        t.Error(err)
    }
    fmt.Println("encPrivateKey: ", encPrivateKey)
    fmt.Println("keyStore: ", string(dataByte))

2.3.2 SDK 在线API

在线API主要用于向星火链上发出交易和查询合约, 需要初始化SDK连接后使用.

初始化SDK

示例

 url := "http://test.bifcore.bitfactory.cn"
 sdk, err := GetInstance(url)  //SDK_INSTANCE_URL为星火链RPC地址

账户处理接口

查询账户信息

接口 GetAccount(r request.BIFAccountGetInfoRequest) response.BIFAccountGetInfoResponse
用途:

用来获取一个账户当前信息

示例

    as := GetAccountInstance(SDK_INSTANCE_URL)
    // 初始化请求参数
    accountAddress := "did:bid:ef21AHDJWnFfYQ3Qs3kMxo64jD2KATwBz"
    r := request.BIFAccountGetInfoRequest{
        Address: accountAddress,
    }
    res := as.GetAccount(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }

    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }

    fmt.Println("res: ", string(dataByte))

获取账户nonce

接口 GetNonce(r request.BIFAccountGetNonceRequest) response.BIFAccountGetNonceResponse
用途:

用来获取一个账户当前nonce值, 有关nonce含义, 请参照星火链开发基础章节.

示例:

    as := GetAccountInstance(SDK_INSTANCE_URL)
    // 初始化请求参数
    accountAddress := "did:bid:ef21AHDJWnFfYQ3Qs3kMxo64jD2KATwBz"
    r := request.BIFAccountGetNonceRequest{
        Address: accountAddress,
    }
    res := as.GetNonce(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

获取账户余额

接口 GetAccountBalance(r request.BIFAccountGetBalanceRequest) response.BIFAccountGetBalanceResponse
用途:

用来获取一个账户当前的XHT余额.

示例:

    as := GetAccountInstance(SDK_INSTANCE_URL)
    // 初始化请求参数
    accountAddress := "did:bid:ef21AHDJWnFfYQ3Qs3kMxo64jD2KATwBz"
    r := request.BIFAccountGetBalanceRequest{
        Address: accountAddress,
    }
    res := as.GetAccountBalance(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

Block相关接口

获取当前块高度

接口 GetBlockNumber() response.BIFBlockGetNumberResponse
用途:

获取当前链上最新的Block号

示例:

    bs := GetBlockInstance(SDK_INSTANCE_URL)
    res := bs.GetBlockNumber()
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    fmt.Println("blockNumber:", res.Result.Header.BlockNumber)

获取指定块内的交易列表

接口 GetTransactions(r request.BIFBlockGetTransactionsRequest) response.BIFBlockGetTransactionsResponse
用途:

给定block号,获取该block内的交易列表信息

示例:

    bs := GetBlockInstance(SDK_INSTANCE_URL)
    var r request.BIFBlockGetTransactionsRequest
    r.BlockNumber = 617247
    res := bs.GetTransactions(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    fmt.Printf("result: %+v \n", res.Result)

获取指定块的统计信息

接口 GetBlockInfo(r request.BIFBlockGetInfoRequest) response.BIFBlockGetInfoResponse
用途:

给定block号, 查询指定block的信息.

示例:

    bs := GetBlockInstance(SDK_INSTANCE_URL)
    var r request.BIFBlockGetInfoRequest
    r.BlockNumber = 617247
    res := bs.GetBlockInfo(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    fmt.Printf("result: %+v \n", res.Result)

查询最新块的信息

接口 GetBlockLatestInfo() response.BIFBlockGetLatestInfoResponse
用途:

获取当前最新块的信息.

示例:

    bs := GetBlockInstance(SDK_INSTANCE_URL)
    res := bs.GetBlockLatestInfo()
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    fmt.Printf("result: %+v \n", res.Result)

Transaction相关接口

获取指定交易相关信息

接口 GetTransactionInfo(r request.BIFTransactionGetInfoRequest) response.BIFTransactionGetInfoResponse
用途:

获取指定交易的详细信息

示例:

    ts := GetTransactionInstance(SDK_INSTANCE_URL)
    var r request.BIFTransactionGetInfoRequest
    r.Hash = "2c0a445f603bdef7e4cfe5f63650f201cda3315b7c560edb79e3fcef611c5f8e"
    res := ts.GetTransactionInfo(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

提交交易

接口 BIFSubmit(r request.BIFTransactionSubmitRequest) response.BIFTransactionSubmitResponse
用途:

提交交易到星火链

示例:

    submitRequest := request.BIFTransactionSubmitRequest{
        Serialization: hex.EncodeToString(blob),
        SignData:      hex.EncodeToString(signData),
        PublicKey:     pubKey,
    }
    
    res := ts.BIFSubmit(submitRequest)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err = json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

合约相关接口

部署合约

接口 ContractCreate(r request.BIFContractCreateRequest) response.BIFContractCreateResponse
用途:

部署合约到星火链上

示例:

    bs := GetContractInstance(SDK_INSTANCE_URL)
    var r request.BIFContractCreateRequest
    senderAddress := "did:bid:efzewQxg38x2Tmb1cpxSC1ZWwMZUxUeV"
    senderPrivateKey := "priSPKhTMRa7SsQLc4wXUDrEZW5wSeKN68Xy5LuCYQmndS75SZ"
    payload := "\"use strict\"; function init(bar){return;} function main(input){let para = JSON.parse(input);if(para.do_foo){let x = {'hello' : 'world'};}} function query(input){return input;}"
    r.SenderAddress = senderAddress
    r.PrivateKey = senderPrivateKey
    r.Metadata = "create contract"
    r.Payload = payload
    r.InitBalance = 1
    r.Type = 0
    r.InitBalance = 1
    r.FeeLimit = 10000000000

    res := bs.ContractCreate(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

从部署交易中获取合约地址

接口 GetContractAddress(r request.BIFContractGetAddressRequest) response.BIFContractGetAddressResponse
用途:

提供部署合约的交易哈希, 返回合约地址

示例

    bs := GetContractInstance(SDK_INSTANCE_URL)
    var r request.BIFContractGetAddressRequest
    r.Hash = "ff6a9d1a0c0011fbb9f51cfb99e4cd5e7c31380046fda3fd6e0daae44d1d4648"
    res := bs.GetContractAddress(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

获取合约相关信息

接口 GetContractInfo(r request.BIFContractGetInfoRequest) response.BIFContractGetInfoResponse
用途:

指定合约地址, 获取合约相关信息.

示例

    bs := GetContractInstance(SDK_INSTANCE_URL)
    var r request.BIFContractGetInfoRequest
    r.ContractAddress = "did:bid:efWVypEKTQoVTunsdBDw8rp4uoG5Lsy5"
    res := bs.GetContractInfo(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

查询合约

接口 ContractQuery(r request.BIFContractCallRequest) response.BIFContractCallResponse
用途:

调用合约Query接口, 查询合约数据

示例:

    bs := GetContractInstance(SDK_INSTANCE_URL)
    var r request.BIFContractCallRequest
    r.ContractAddress = "did:bid:efWVypEKTQoVTunsdBDw8rp4uoG5Lsy5"
    res := bs.ContractQuery(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }

    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))

调用合约

接口 ContractInvoke(r request.BIFContractInvokeRequest) response.BIFContractInvokeResponse
用途:

在链上发出交易调用合约可写接口

示例:

    bs := GetContractInstance(SDK_INSTANCE_URL)
    var r request.BIFContractInvokeRequest
    senderAddress := "did:bid:efzewQxg38x2Tmb1cpxSC1ZWwMZUxUeV"
    contractAddress := "did:bid:efWVypEKTQoVTunsdBDw8rp4uoG5Lsy5"
    senderPrivateKey := "priSPKhTMRa7SsQLc4wXUDrEZW5wSeKN68Xy5LuCYQmndS75SZ"
    
    r.SenderAddress = senderAddress
    r.PrivateKey = senderPrivateKey
    r.ContractAddress = contractAddress
    r.BIFAmount = 1
    r.Metadata = "contract invoke"

    res := bs.ContractInvoke(r)
    if res.ErrorCode != 0 {
        t.Error(res.ErrorDesc)
    }
    
    dataByte, err := json.Marshal(res)
    if err != nil {
        t.Error(err)
    }
    
    fmt.Println("res: ", string(dataByte))