前端react+scatter钱包+EOS的对接及账户余额查询。

前言

Scatter的开发文档写的就…很多细节它都没说，导致我踩了很多坑。你敢信我是从报错->google报错->git上面的一个issue->vue版本的连接代码这样子搞出来的吗，我人傻了.

前置准备

1. eos链 比如下面的

let jungle2 = {
   protocol: "http",
   blockchain: "eos",
   host: "jungle2.cryptolions.io",
   port: 80,
   chainId: "e70aaab8997e1dfce58fbfac80cbbb8fecec7b99cf982a9444273cbc64c41473"
};

2. 在该链上有账户

Scatter中的一些设置地方

• 添加自定义网络链（chainid点击画圈处会自动生成）
  
• 通过私钥添加或创建账户
  

下载依赖

npm i -S scatterjs-core  //核心
npm i -S eosjs  //eos开发所依赖的eosjs，
npm i -S scatterjs-plugin-eosjs  //eosjs版本小于等于16.0.9时候下载这个
npm i -S scatterjs-plugin-eosjs2    // eosjs最新版本的下载这个(npm i -S eosjs这下载的必定是最新版本，所以肯定下载这个啦)

头部引入

下面所有代码全在一个index,js的文件中

import ScatterJS,{
     Network} from 'scatterjs-core';
import {
     Api, JsonRpc}  from "eosjs";
import ScatterEOS from 'scatterjs-plugin-eosjs2'
// Don't forget to tell ScatterJS which plugins you are using.
ScatterJS.plugins( new ScatterEOS() );

相关配置(就是个对象和常量啦)

//网络配置
const network = Network.fromJson({
     
    blockchain:'eos',
    host:'写你自己的',
    port:8888,
    protocol:'http',
    chainId:'写你自己的'
});
//rpc是eosjs中的东西，有很多方法可以查询余额之类的
const rpc = new JsonRpc(network.fullhost());

组件的基本样子

export default function ScatterTest () {
     
    const [scatter,setScatter]=useState(null)//等会会获取的scatter
    const [state,setState]=useState({
     //等会会获取数据，先占个茅坑
        identity:null,
        account:null,
        eos:null,
    })
    //简单的打印下state的值
    useEffect(()=>{
     
        console.log('state',state);
    },[state])
    //连接Scatter
    function connectToScatter() {
     ...}
    //获取用户身份,用户登录
    function getIdentity(scatter){
     ...}
    //断开连接,用户登出
    function forgetIdentity(scatter){
     ...}
    //获取余额信息
    function getCurrencyBalance(account){
     }
	return(
        <>
            <button onClick={
     connectToScatter}>连接scatter</button>
            <button onClick={
     ()=>{
     forgetIdentity(scatter)}}>断开连接scatter</button>
            <button onClick={
     ()=>{
     getCurrencyBalance(state.account)}}>获取余额信息</button>
        </>
    )
}

连接scatter和登录

	//连接scatter
    function connectToScatter() {
     
        ScatterJS.scatter.connect("这里是随便起的名字").then(connected => {
     
            // 用户没有下载Scatter或者下载了但是没有打开运行
            if(!connected) {
     
                alert('User does not have Scatter Desktop, Mobile or Classic installed.')
                return false;
            }
            //获取到了scatter
            const scatter = ScatterJS.scatter;
            setScatter(scatter)
            //用户登录
            getIdentity(scatter)
            /*
            * Always remember to null out the window.ScatterJS reference, if you don't extensions
            * will be able to catch that reference and make requests to the user's Scatter on behalf of
            * your domain, and you will have to take responsibility.
            * （我概况下：必写，不然会被截取伪造操作，你要负责的哦）
            * */
            window.ScatterJS = null;

        });
    }
  //获取用户身份
    function getIdentity(scatter) {
     
        scatter.getIdentity({
     
            personal:['firstname', 'lastname','email','birthdate'],
            location:['country','address','city','state','country'],
            accounts:[network]
        }).then(identity => {
     
            // Always use the accounts you got back from Scatter. Never hardcode them even if you are prompting
            // the user for their account name beforehand. They could still give you a different account.
            //概况：就这么写对了。
            const account = scatter.identity.accounts.find(x => x.blockchain === 'eos');//EOSIO account
            // Get a proxy reference to eosjs which you can use to sign transactions with a user's Scatter.
            //在这拿到eos
            const eos = scatter.eos(network, Api);//a reference to an eosjs object
			//把值保存下来
            setState({
     
                ...state,
                identity,
                account,
                eos
            })

        }).catch(error => {
     
            console.log('error',error);
        })
    }   

如果没下载或运行Scatter情况

如果下载且Scatter在运行的情况

获取到的数据

退出登录

 //断开连接,用户登出
    function forgetIdentity(scatter) {
     
    	//主要就是调用scatter的这个方法
        scatter.forgetIdentity()
        //都清空掉
        setScatter(null)
        setState({
     
            identity:null,
            account:null,
            eos:null,
        })
    }

查询余额

 //查询账户余额
    function getCurrencyBalance(account) {
     
        (async () => {
     
            console.log('EOS',await rpc.get_currency_balance('eosio.token', account.name, 'EOS'));
        })();
        (async () => {
     
            console.log('HODLC',await rpc.get_currency_balance('eosio.token', account.name, 'HODLC'));
        })();
        (async () => {
     
            console.log('HODLT',await rpc.get_currency_balance('eosio.token', account.name, 'HODLT'));
        })();
    }

获取到的数据

Faq

1. 怎么没用到eos这个值呢？,查询你用的是rpc啊

const eos = scatter.eos(network, Api);//a reference to an eosjs object

const rpc = new JsonRpc(network.fullhost());

这就涉及到这两个东西的介绍了.

• JsonRpc 主要是用来查询数据，与交易无关，就比如余额，块信息，交易信息啥的,你甚至都不用登录的，只要知道账户名字就能查到相关信息
• Api 主要是和交易相关的操作，肯定要用户授权的就是登录。

上面我就是简单的查了下余额所以也用不到eos呀

相关地址

Scatter开发文档（大概看看，写的是真的一言难尽）
eosjs开发文档(提供了各种api和rpc方法)