使用代码访问EOS智能合约

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分类专栏：区块链 EOS 文章标签：使用代码访问EOS智能合约

于 2019-08-01 19:24:35 首次发布

本文链接：https://blog.youkuaiyun.com/u013068887/article/details/98093151

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本文介绍如何使用RPC接口与EOS智能合约交互，包括启动节点服务、初始化钱包和账户、部署代币合约并发行代币，以及通过不同方式实现代币转账。

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使用RPC接口与EOS智能合约交互。

示例代码依赖于eosio.token系统合约。

运行示例代码

1、启动节点服务

在1#终端启动nodeos，建议启动前先清除历史数据：

~$ rm -rf ~/.local/share/eosio/nodeos/data
~$ nodeos

或者使用方便脚本：

~$ clean-nodeos.sh

在2#终端启动keosd：

~$ keosd

2、初始化钱包和账户

在3#终端执行以下脚本初始化默认钱包，然后创建3个账号：

~$ init-wallet.sh
~$ new-account.sh eosio.token
~$ new-account.sh tommy
~$ new-account.sh jerry

3、部署代币合约并发行代币

在3#终端执行以下脚本部署系统代币合约：

~$ deply-contract.sh eosio.token ~/eos/build/contracts/eosio.token

系统代币合约部署成功后，执行以下脚本注册总量100万个HAPY代币，并向tommy发行100个：

~$ new-token.sh

4、使用rpc调用转账

tommy向jerry转账2个HAPY代币。

在3#终端进入~/repo/chapter6，然后执行以下脚本：

~$ cd ~/repo/chapter6
~/repo/chapter6$ ./rpc-transfer.sh

5、使用eosjs转账

tommy向jerry转账2个HAPY代币。

在3#终端运行transfer.js：

~/repo/chapter6$ node transfer.js

6、在eosjs中使用keosd签名交易

tommy向jerry转账2个HAPY代币。

在3#终端运行transfer-with-keosd.js：

~/repo/chapter6$ node transfer-with-keosd.js

文件目录组织

rpc-transfer.sh：使用curl通过rpc调用实现代币转账

#!/bin/bash

API_BASE=http://127.0.0.1:8888/v1
WALLET_BASE=http://127.0.0.1:8900/v1
TOOLS_HOME=$HOME/repo/tools
PUBLIC_KEY=`cat $TOOLS_HOME/artifacts/tommy/activePublicKey`
WALLET_PASS=`cat $TOOLS_HOME/artifacts/defaultWalletPassword`
  

serialize(){
  payload='{
    "code":"eosio.token",
    "action":"transfer",
    "args":{
      "from":"tommy",
      "to":"jerry",
      "quantity":"2.00 HAPY",
      "memo":"take care"
    }
  }'
  API=chain/abi_json_to_bin
  echo $(curl $API_BASE/$API -X POST -s -d "$payload" | jq ".binargs")
  #curl $API_BASE/$API -X POST -s -d "$payload" 
}

get_info(){
  API=chain/get_info
  curl $API_BASE/$API -X POST -s| jq ".head_block_num,.chain_id"
}

get_block_info(){
  payload='{"block_num_or_id":'$1'}'
  API=chain/get_block
  curl $API_BASE/$API -X POST -s -d "$payload" | jq ".block_num,.ref_block_prefix,.timestamp"
}

unlock_wallet(){
  payload='["default","'$WALLET_PASS'"]'
  echo $payload
  API=wallet/unlock
  curl $WALLET_BASE/$API -X POST -s -d "$payload" | jq
}

# params: ref_block_num,ref_block_prefix,timestamp,data
sign_transaction(){
  payload='[
    {
      "ref_block_num": '$1',
      "ref_block_prefix": '$2',
      "expiration": '$3',
      "actions": [
        {
          "account": "eosio.token",
          "name": "transfer",
          "authorization": [{ "actor": "tommy", "permission": "active" }],
          "data": '$4'
        }
      ],
      "signatures": []
    },
    ["'$PUBLIC_KEY'"],
    '$5'
  ]'
 
  API=wallet/sign_transaction
  curl $WALLET_BASE/$API -X POST -s -d "$payload" | jq ".signatures[0]"
}

show_table(){
  payload='{
    "code": "eosio.token",
    "scope": "tommy",
    "table": "accounts",
    "json": "true"
  }'
  API=chain/get_table_rows
  curl $API_BASE/$API -X POST -s -d "$payload" | jq  
}

#params: r
push_transaction(){
  payload='{
    "compression": "none",
    "transaction": {
      "expiration": '$3',
      "ref_block_num": '$1',
      "ref_block_prefix": '$2',
      "context_free_actions": [],
      "actions": [
          {
              "account": "eosio.token",
              "name": "transfer",
              "authorization": [
                  {
                      "actor": "tommy",
                      "permission": "active"
                  }
              ],
              "data": '$4'
          }
      ],
      "transaction_extensions": []
    },
    "signatures": ['$5']
  }'
  API=chain/push_transaction
  curl $API_BASE/$API -X POST -s -d "$payload" | jq ".transaction_id"
  
}

txdata=$(serialize)
info=($(get_info))
head_block_num=${info[0]}
chain_id=${info[1]}
block_info=($(get_block_info $head_block_num))
expired=\"`date -d next-hour "+%Y-%m-%dT%H:%M:%S.999"`\"
signature=`sign_transaction ${block_info[0]} ${block_info[1]} ${expired} $txdata ${chain_id}`
push_transaction ${block_info[0]} ${block_info[1]} ${expired} $txdata $signature
show_table

transfer.js：使用eosjs进行代币转账

const Eos = require('eosjs')
const fs = require('fs')

prvkey = fs.readFileSync('/home/user/repo/tools/artifacts/tommy/activePrivateKey','utf-8').trim()

const config = {
  httpEndpoint: 'http://localhost:8888',
  keyProvider: [prvkey]
}

const nodeos = Eos(config)

nodeos.contract("eosio.token")
  .then(contract => contract.transfer("tommy","jerry","2.00 HAPY",{authorization:["tommy"]}))
  .then(rsp => console.log(rsp.transaction_id))
  .then(() => nodeos.getTableRows(true,"eosio.token","tommy","accounts"))
  .then(rsp => console.log(rsp))
  .catch(err => console.log(err))

transfer-with-keosd.js：在eosjs中使用keosd进行交易签名的代币转账

const Eos = require('eosjs')
const fs = require('fs')
const ecc = require('eosjs-ecc')
const WalletApi = require('./WalletApi')

const pubkey = fs.readFileSync('/home/user/repo/tools/artifacts/tommy/activePublicKey','utf-8').trim()
const chain_id = 'cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f'
const keosd = WalletApi({
  httpEndpoint: 'http://localhost:8900'
})
const keosdSigner = function({transaction}){
    const data = [
      transaction,
      [pubkey],
      chain_id
    ]  
  	return keosd.signTransaction(data)
  		.then(ret => ret.signatures[0])    
}

const config = {
  httpEndpoint: 'http://localhost:8888',
  signProvider: keosdSigner
}

const nodeos = Eos(config)

nodeos.contract("eosio.token")
  .then(contract => contract.transfer("tommy","jerry","2.00 HAPY",{authorization:["tommy"]}))
  .then(rsp => console.log(rsp.transaction_id))
  .then(() => nodeos.getTableRows(true,"eosio.token","tommy","accounts"))
  .then(rsp => console.log(rsp))
  .catch(err => console.log(err))

WalletApi.js：keosd的RPC API封装

const apiGen = require('eosjs-api/lib/apigen')
const processArgs = require('eosjs-api/lib/process-args')

const api = {
  "wallet": {
    "list_wallets": {
      "params": null,
      "results": "string[]"
    },
    "sign_transaction":{
      "params": "array",
      "results": "signed_transaction"
    }
  }
}

const WalletApi = function(config) {
  return apiGen('v1', api, config)
}

Object.assign(
  WalletApi,
  {
    processArgs,
    api
  }
)

module.exports = WalletApi