新手教程 eosjs 官方使用文档翻译

guqianfeng · May 14, 2018 · Last by ccc replied at May 14, 2018 · 7583 hits

eosjs使用说明文档

翻译:古千峰 @BTCMedia

版本说明:

Version EOSIO/eosjs Npm EOSIO/eos Docker Node
DAWN-2018-04-23-ALPHA tag:9.x.x npm install eosjs@dawn3 tag:DAWN-2018-04-23-ALPHA eosio/eos:DAWN-2018-04-23-ALPHA Docker配置
dawn3 tag:8.x.x npm install eosjs@8 tag:dawn-v3.0.0 eosio/eos:dawn3x Docker配置
dawn2 branch:dawn2 npm install eosjs branch:dawn-2.x eosio/eos:dawn2x Docker配置

支持环境

node v8+ npm 6.1.11

EOSJS

用法:

Eos = require('eosjs') // Eos = require('./src')

// eos = Eos.Localnet() // 本地127.0.0.1:8888
eos = Eos.Testnet() // 调用eos.io测试网络 testnet at eos.io

// All API methods print help when called with no-arguments.
eos.getBlock() //获取区块

// Next, your going to need nodeos running on localhost:8888

// If a callback is not provided, a Promise is returned
eos.getBlock(1).then(result => {console.log(result)})

// Parameters can be sequential or an object
eos.getBlock({block_num_or_id: 1}).then(result => console.log(result))

// Callbacks are similar
callback = (err, res) => {err ? console.error(err) : console.log(res)}
eos.getBlock(1, callback)
eos.getBlock({block_num_or_id: 1}, callback)

// Provide an empty object or a callback if an API call has no arguments
eos.getInfo({}).then(result => {console.log(result)})

API调用的文档见:

链接配置

Eos = require('eosjs') // Eos = require('./src')

// Optional configuration..
config = {
  keyProvider: ['PrivateKeys...'], // WIF string or array of keys..
  httpEndpoint: 'http://127.0.0.1:8888',
  mockTransactions: () => 'pass', // or 'fail'
  transactionHeaders: (expireInSeconds, callback) => {
    callback(null/*error*/, headers)
  },
  expireInSeconds: 60,
  broadcast: true,
  debug: false,
  sign: true
}

eos = Eos.Localnet(config)

参数说明:

  • mockTransactions(可选)

    • pass: 不广播,加装交易工作
    • fail: 不广播,加装交易失败
    • null|undefined: 广播(默认)
  • transactionHeaders(可选) 手动设置交易记录头,该方法中的callback回调函数每次交易都会被调用。头记录的文档见 eosjs-api#headers

选项

例如:eos.transfer(params, options)

options = {
  broadcast: true,
  sign: true,
  authorization: null
}
  • authorization {array<auth>|auth} - 该参数用于在多签名情况下,识别签名帐号与权限。用字符串格式,如:account@permission 或者使用对象,如:object<{actor:account,permission}>
    • 如果不写,则使用默认的授权
    • 如果提供授权账户,则其他账户不能被添加
    • 多个账户按照账户名排序

用法

如果使用测试网络,需要在keyProvider配置私钥。

Eos = require('eosjs') // Eos = require('./src')

eos = Eos.Localnet({keyProvider: '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'})

// Run with no arguments to print usage.
eos.transfer() //显示用法

// Usage with options (options are always optional)
options = {broadcast: false} //不广播此笔交易
eos.transfer({from: 'inita', to: 'initb', quantity: '1 EOS', memo: ''}, options) //从inita发送1个EOS到initb账户

// Object or ordered args may be used.
eos.transfer('inita', 'initb', '2 EOS', 'memo', options)

// A broadcast boolean may be provided as a shortcut for {broadcast: false}
eos.transfer('inita', 'initb', '1 EOS', '', false)

API方法的参数见 eosio_system

【译者注】如获取投票者信息使用 voter_info,获取区块节点信息使用 producer_info,发布资产使用 issue,获取区块链参数使用 blockchain_parameters等等

关于签名的高级用法,查看 keyProvidereosjs-keygen 或者 unit test

简写规则(Shorthand)

在一些特殊情况下,可以使用简写,如资产类Asset和授权类Authority 例如:

  • deposit: '1 eos'1.0000 EOS的简写
  • owner: 'EOS6MRy..'{threshold: 1, keys: [key: 'EOS6MRy..', weight: 1]} 的简写
  • recover: inita 或者 inita@active 分别是以下的简写形式:

  • {{threshold: 1, accounts: [..actor: inita, permission: active, weight: 1]}}

  • inita@otheractive权限改为other

Eos = require('eosjs') // Eos = require('./src')

initaPrivate = '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'
initaPublic = 'EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV'
keyProvider = initaPrivate

eos = Eos.Localnet({keyProvider})

eos.newaccount({
  creator: 'inita',
  name: 'mynewacct',
  owner: initaPublic,
  active: initaPublic,
  recovery: 'inita'
})

智能合约部署

setcode命令会在签名与广播前,将WASM的文本智能合约编译成二进制文件,编译将使用npm的 binaryen库,因为默认情况下,因为该库文件很大,没有被包括到eosjs中。 安装binaryen库:

npm i binaryen@37.0.0

如果遇到binaryen版本与EOS版本发生不兼容,请参考 problematic 在js源码中导入binaryen:

binaryen = require('binaryen');
eos = Eos.Testnet({..., binaryen});

一个通过eosjs做代币发行的完整代码:(【译者注:此代码适用于Dawn2.0版本】)

Eos = require('eosjs')
let {ecc} = Eos.modules

initaPrivate = '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3';//inita私钥

currencyPrivate = ecc.seedPrivate('currency');
currencyPublic  = ecc.privateToPublic(currencyPrivate);

keyProvider     = [initaPrivate, currencyPrivate];

binaryen = require('binaryen');//导入编译器

eos = Eos.Localnet({keyProvider, binaryen});

eos.newaccount({
    creator:    'inita',
    name:       'currency',
    owner:      currencyPublic,
    active:     currencyPublic,
    recovery:   'inita'
});

contractDir = `${process.env.HOME}/eosio/dawn3/build/contracts/currency`; //合约所在目录
wast = fs.readFileSync(`${contractDir}/currency.wast`);//读取wast文件,wast文件通过eosiocpp编译
abi  = fs.readFileSync(`${contractDir}/currency.abi`);//读取abi文件

//将智能合约发不到区块链
eos.setcode('currency', 0, 0, wast);
eos.setabi('currency', JSON.parse(abi));

currency = null;
// eos.contract(account<string>, [options], [callback]);
eos.contract('currency').then(contract => currency = contract);//部署合约

// 让inita账户执行该合约,并发行一个代币CUR
currency.issue('inita', '10000.0000 CUR', {authorization: 'currency'});

原子操作

区块链级别的原子操作实例:

Eos = require('eosjs')

keyProvider = [
    '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3',
    Eos.modules.ecc.seedPrivate('currency')
]; //keyProvider的又一种写法

eos = Eos.Localnet({keyProvider});

//如果任何一个操作失败,所有操作将都失败
eos.transaction(eos =>
    {
        eos.transfer('inita', 'initb', '1 EOS', '');
        eos.transfer('inita', 'initc', '1 EOS', '');
    }
    // [options],
    // [callback]
);

//通过智能合约currency交易资产
eos.transaction('currency', currency => {
    currency.transfer('inita', 'initb', '1 CUR', '');
});

//在一次交易中混合不同资产交易
eos.transaction(['currency', 'eosio'], ({currency, eosio}) => {
    currency.transfer('inita', 'initb', '1 CUR', '');
    eosio.transfer('inita', 'initb', '1 EOS', '');
});

//检查后在发送
eos.contract('currency').then(currency => {
    currency.transaction(cur => {
        cur.transfer('inita', 'initb', '1 CUR', '');
        cur.transfer('initb', 'inita', '1 CUR', '');
    });
    currency.transfer('inita', 'initb', '1 CUR', '');
});

手动配置发送transacition

优点,灵活度更高

Eos = require('eosjs')

eos = Eos.Localnet({keyProvider: '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'});

eos.transaction({
    actions: [
        {
            account: 'eosio',
            name:    'transfer',
            authorization: [{
                actor:      'inita',
                permission: 'active'
            }],
            data: {
                from:     'inita',
                to:       'initb',
                quantity: '7 EOS',
                memo:     'testing'
            }
        }
    ]
});

后续开发更新

eosjsnodeos的二进制格式将不断的版本更新,因此,在运行nodeos时需要添加参数:--skip-transaction-signatures。 另外,注意编译包配置文件 package.json中的目录结构指向 ./lib,如果要测试时,需要从./src导入import,如下:

Eos = require('./src');
eos = Eos.Localnet(...);

除了以上提到的外,eos实例还可以提供很多信息。

// 'nonce' is a struct but could be any type or struct like: uint8 or transaction
nonce = {value: '..'}
nonceBuffer = eos.fc.toBuffer('nonce', nonce)
assert.deepEqual(nonce, eos.fc.fromBuffer('nonce', nonceBuffer))

// Serialization for a smart-contract's Abi:
eos.contract('currency', (error, c) => currency = c)
issue = {to: 'inita', quantity: '1.0000 CUR', memo: 'memo'}
issueBuffer = currency.fc.toBuffer('issue', issue)
assert.deepEqual(issue, currency.fc.fromBuffer('issue', issueBuffer))

相关库文件参考

以下这些库已经被无缝集成到了eosjs中,也许可以被单独拿出来使用:

var {api, ecc, json, Fcbuffer, format} = Eos.modules

  • format ./format.md

    • 区块链名称验证
    • 资产类名称格式化
  • eosjs-api [ Github, NPM]

    • 远程访问EOS区块链节点(nodeos)的API
    • 使用此API可以直接访问区块链上只读数据(无需对交易签名)
  • eosjs-ecc [ Github, NPM]

    • 提供私钥、公钥、签名管理,AES,加密与解密
    • 验证公钥/私钥
    • 使用EOS兼容的checksums加密/解密
    • 计算用于分享的秘密
  • json {api, achema}

    • 定义了区块链的json数据操作API
  • eosjs-keygen [ Github, NPM ]

    • 私钥与密钥管理
  • Fcbuffer [ Github, NPM ]

    • 二进制数据序列化
    • 客户端对交易二进制码签名
    • 允许客户知道当前签名情况

区块链浏览器

获取并安装区块链浏览器,通过以下方式安装EOS测试链的区块链浏览器。

git clone https://github.com/EOSIO/eosjs.git
cd eosjs
npm install
npm run build_browser

编辑网页文件

<script src="eos.js"></script>
<script>
var eos = Eos.Testnet()
//...
</script>
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看了文章,翻译的很棒。👍

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