· 使用者在主鏈上出售他的代幣
在本教程中，我們將學習如何在兩個網路上部署代幣（RinkeBy網路作為主鏈，POA Sokol作為側鏈），部署並使用橋接器（ERC20 <> ERC20）讓使用者資產從一個網路轉移到另一個網路。
在開始之前，您需要在計算機上安裝以下程式：
1. Git
2. NodeJS/NPM
3. Yarn
4. Docker and Docker-Compose
5. Metamask
6. Truffle
$ npm install -g truffle
$ truffle version
Truffle v5.0.20 (core: 5.0.20)
Solidity v0.5.0 (solc-js)
Node v8.15.1
Web3.js v1.0.0-beta.37
步驟1：在主鏈（Rinkeby網路）上部署名為BRidge Token BRT的ERC20令牌
1、讓我們首先為我們的ERC20 BRT建立一個專案資料夾並初始化一個Truffle專案。
$ mkdir token
$ cd token
$ truffle init
2、然後我們將安裝Open-Zeppelin Solidity庫，其中經過充分測試和審計的可重用智慧合約。
$ npm init -y
$ npm install openzeppelin-solidity --save-exact
3、建立一個包含的合同檔案./contacts/BridgeToken.sol
// BridgeToken.sol
pragma solidity ^0.5.8;
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol";
contract BridgeToken is ERC20Mintable {
string public constant name = "Bridge Token";
string public constant symbol = "BRT";
uint8 public constant decimals = 18;
}
要確保您的智慧合約編譯，您可以執行命令truffle compile。
4、在RinkeBy網路上部署智慧合約
注意：確保用於部署合同的帳戶由RinkeBy ethers資助。
我們的智慧合約編譯完成，我們就需要部署它。為此，我們首先需要完成指令碼遷移，建立一個檔案./migrations/2_deploy_contract.js
// 2_deploy_contract.js
const BridgeToken = artifacts.require("./BridgeToken.sol");
module.exports = function(deployer, network, accounts) {
// Deploy the smart contract
deployer.deploy(BridgeToken, {from: accounts[0]}).then(function(instance) {
// Mint 100 tokens
return instance.mint(accounts[0], web3.utils.toBN("100000000000000000000"), {from: accounts[0]});
});
};
指令碼遷移後並部署合約，另外還建立了100個BRT代幣並將其分發到部署者帳戶。
下一步包括配置到rinkeby網路的連線，以便部署智慧合約。
安裝以下依賴項（dotenv用於管理環境變數，而truffle-hdwallet-provider用於從來自助記符的帳戶簽署事務）
$ npm install --save dotenv truffle-hdwallet-provider
建立一個檔案./.env來儲存一些私人資訊，我們不想在任何地方共享（gitignore這個檔案）
· infura是以太坊的公共門戶。如果您還沒有帳戶，我建議您建立一個帳戶，並在此檔案中跳過您的API金鑰（專案ID）。
· 助記符是12個單片語成的短語，象徵著一把私鑰。 你可以在Metamask中找到它。
// .env
INFURA_API_KEY=044443611111111e19e03433333309923
MNEMONIC=twelve words you can find in metamask/settings/reveal seed words
最後，讓我們配置與RinkeBy網路的連線。編輯檔案./truffle.js
// truffle.js
require('dotenv').config();
const HDWalletProvider = require("truffle-hdwallet-provider");
module.exports = {
networks: {
development: {
host: "localhost",
port: 8545,
network_id: "*"
},
rinkeby: {
provider: new HDWalletProvider(process.env.MNEMONIC, "https://rinkeby.infura.io/v3/" + process.env.INFURA_API_KEY),
network_id: 4,
gas: 4500000
}
}
};
要在rinkeby網路上部署智慧合約，請執行命令（這可能需要一段時間）：
$ truffle migrate --network rinkeby
Compiling your contracts...
===========================
> Compiling ./contracts/BridgeToken.sol
> Compiling ./contracts/Migrations.sol
> Compiling openzeppelin-solidity/contracts/access/Roles.sol
> Compiling openzeppelin-solidity/contracts/access/roles/MinterRole.sol
> Compiling openzeppelin-solidity/contracts/math/SafeMath.sol
> Compiling openzeppelin-solidity/contracts/token/ERC20/ERC20.sol
> Compiling openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol
> Compiling openzeppelin-solidity/contracts/token/ERC20/IERC20.sol
> Artifacts written to /home/gjeanmart/workspace/tutorials/bridge_token/build/contracts
> Compiled successfully using:
- solc: 0.5.8+commit.23d335f2.Emscripten.clang
Migrations dry-run (simulation)
===============================
> Network name: 'rinkeby-fork'
> Network id: 4
> Block gas limit: 0x7244c0
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> block number: 4502550
> block timestamp: 1559667907
> account: 0xF0f15Cedc719B5A55470877B0710d5c7816916b1
> balance: 33.578282390129999997
> gas used: 246393
> gas price: 2 gwei
> value sent: 0 ETH
> total cost: 0.000492786 ETH
-------------------------------------
> Total cost: 0.000492786 ETH
2_deploy_contract.js
====================
Deploying 'BridgeToken'
-----------------------
> block number: 4502552
> block timestamp: 1559667919
> account: 0xe9B0E206C8cA079bca49F0120abfD02760093612
> balance: 99.996785462
> gas used: 1607269
> gas price: 2 gwei
> value sent: 0 ETH
> total cost: 0.003214538 ETH
-------------------------------------
> Total cost: 0.003214538 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.003707324 ETH
Starting migrations...
======================
> Network name: 'rinkeby'
> Network id: 4
> Block gas limit: 0x724802
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0x44dbbf18d316adb29143d1b3341c1e28b297d144411ee98cb23017270f77b9ed
> Blocks: 1 Seconds: 9
> contract address: 0xAC96dc3AC9baB86c7d89a5868096394CB708a6a0
> block number: 4502551
> block timestamp: 1559667943
> account: 0xF0f15Cedc719B5A55470877B0710d5c7816916b1
> balance: 33.573547316129999997
> gas used: 261393
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00522786 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00522786 ETH
2_deploy_contract.js
====================
Deploying 'BridgeToken'
-----------------------
> transaction hash: 0x80dc122178131cbd040e90b667cc1d11a47d21abf8ebf17c80232b1c4c5f33df
> Blocks: 2 Seconds: 21
> contract address: 0x40A6a864133985E1146DDfEb48c7391CD07596F5
> block number: 4502554
> block timestamp: 1559667988
> account: 0xF0f15Cedc719B5A55470877B0710d5c7816916b1
> balance: 33.540261476129999997
> gas used: 1622269
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.03244538 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.03244538 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.03767324 ETH
因此，我們可以將我們的智慧合約BridgeToken標識為已部署在地址0x40A6a864133985E1146DDfEb48c7391CD07596F5（請參閱block explorer）
步驟2：初始化monorepo令牌橋
在第二步中，我們將初始化GitHub mono-repository，以便按以下步驟安裝每個元件。
1、複製repo
$ cd ../
$ git clone --recursive https://github.com/poanetwork/tokenbridge
$ cd ./tokenbridge/
2、安裝依賴項
$ yarn install && yarn install:deploy
步驟3：配置和部署網橋合約
在第三步中，我們將部署必要的合約以啟用ERC20到ERC20網橋。
1、轉到合約資料夾
$ cd ./contracts/
2、編譯智慧合約
$ npm run compile
在./deploy/.env中建立配置檔案
注1：要更改以下屬性
<PRIVATE_KEY>負責部署，管理合同和驗證轉移的帳戶
<ACCOUNT_ADMIN>負責部署，管理合同和驗證轉移的帳戶。
<ERC20_TOKEN_ADDRESS>上面部署的ERC20令牌的地址。
注2：出於本教程的原因，我們決定儘可能簡化配置（一個帳戶管理和驗證）
注3：確保賬戶ACCOUNT_ADMIN由RinkeBy ethers和POA Sokol ethers資助。
注4：未配置區塊獎勵（獎勵令牌）。
BRIDGE_MODE=ERC_TO_ERC
#BRIDGE_MODE=NATIVE_TO_ERC
# If Home network does not support byzantium fork, should use contracts compiled for spuriousDragon
#HOME_EVM_VERSION=spuriousDragon
# If Foreign network does not support byzantium fork, should use contracts compiled for spuriousDragon
#FOREIGN_EVM_VERSION=spuriousDragon
DEPLOYMENT_ACCOUNT_PRIVATE_KEY=<PRIVATE_KEY>
DEPLOYMENT_GAS_LIMIT_EXTRA=0.2
HOME_DEPLOYMENT_GAS_PRICE=10000000000
FOREIGN_DEPLOYMENT_GAS_PRICE=10000000000
GET_RECEIPT_INTERVAL_IN_MILLISECONDS=3000
BRIDGEABLE_TOKEN_NAME="Bridge Token"
BRIDGEABLE_TOKEN_SYMBOL=BRT
BRIDGEABLE_TOKEN_DECIMALS=18
HOME_RPC_URL=https://sokol.poa.network
HOME_BRIDGE_OWNER=<ACCOUNT_ADMIN>
HOME_VALIDATORS_OWNER=<ACCOUNT_ADMIN>
HOME_UPGRADEABLE_ADMIN=<ACCOUNT_ADMIN>
HOME_DAILY_LIMIT=30000000000000000000000000
HOME_MAX_AMOUNT_PER_TX=1500000000000000000000000
HOME_MIN_AMOUNT_PER_TX=500000000000000000
HOME_REQUIRED_BLOCK_CONFIRMATIONS=1
HOME_GAS_PRICE=1000000000
BLOCK_REWARD_ADDRESS=0x0000000000000000000000000000000000000000
FOREIGN_RPC_URL=https://rinkeby.infura.io
FOREIGN_BRIDGE_OWNER=<ACCOUNT_ADMIN>
FOREIGN_VALIDATORS_OWNER=<ACCOUNT_ADMIN>
FOREIGN_UPGRADEABLE_ADMIN=<ACCOUNT_ADMIN>
FOREIGN_DAILY_LIMIT=15000000000000000000000000
FOREIGN_MAX_AMOUNT_PER_TX=750000000000000000000000
FOREIGN_MIN_AMOUNT_PER_TX=500000000000000000
FOREIGN_REQUIRED_BLOCK_CONFIRMATIONS=8
FOREIGN_GAS_PRICE=10000000000
#for bridge erc_to_erc and erc_to_native mode
ERC20_TOKEN_ADDRESS=<ERC20_TOKEN_ADDRESS>
# Only for for erc_to_erc mode
ERC20_EXTENDED_BY_ERC677=false
REQUIRED_NUMBER_OF_VALIDATORS=1
#If several validators are used, list them separated by space without quotes
#E.g. VALIDATORS=0x 0x 0x
VALIDATORS=<ACCOUNT_ADMIN>
#Set to ONE_DIRECTION or BOTH_DIRECTIONS if fee will be charged on home side, set to false otherwise
HOME_REWARDABLE=false
# Valid only for rewards on erc_to_native mode. Supported values are BRIDGE_VALIDATORS_REWARD and POSDAO_REWARD
HOME_FEE_MANAGER_TYPE=
#Set to ONE_DIRECTION or BOTH_DIRECTIONS if fee will be charged on foreign side, set to false otherwise
FOREIGN_REWARDABLE=false
#If HOME_REWARDABLE or FOREIGN_REWARDABLE set to true, list validators accounts were rewards should be transferred separated by space without quotes
#E.g. VALIDATORS_REWARD_ACCOUNTS=0x 0x 0x
VALIDATORS_REWARD_ACCOUNTS=0x
# Fee to be taken for every transaction directed from the Home network to the Foreign network
# E.g. 0.1% fee
HOME_TRANSACTIONS_FEE=0.001
# Fee to be taken for every transaction directed from the Foreign network to the Home network
FOREIGN_TRANSACTIONS_FEE=0.001
#for bridge native_to_erc, erc_to_erc mode
DEPLOY_REWARDABLE_TOKEN=false
DPOS_STAKING_ADDRESS=0x0000000000000000000000000000000000000000
4、部署Bridge配置
$ ./deploy.sh
(...)
Deployment has been completed.
[ Home ] HomeBridge: 0xc4e7cA947521f331969e41CC7c99ADa22F2C7F9C at block 9044640
[ Home ] ERC677 Bridgeable Token: 0xEa3acD04DdaF1F1A5Ae1B9f5f690123aA4E19B36
[ Foreign ] ForeignBridge: 0xeb2dbC5AB9380A3517AcA9d8CA0c39873e569a93 at block 4503560
[ Foreign ] ERC20 Token: 0x40A6a864133985E1146DDfEb48c7391CD07596F5
Contracts Deployment have been saved to `bridgeDeploymentResults.json`
{
"homeBridge": {
"address": "0xc4e7cA947521f331969e41CC7c99ADa22F2C7F9C",
"deployedBlockNumber": 9044640,
"erc677": {
"address": "0xEa3acD04DdaF1F1A5Ae1B9f5f690123aA4E19B36"
}
},
"foreignBridge": {
"address": "0xeb2dbC5AB9380A3517AcA9d8CA0c39873e569a93",
"deployedBlockNumber": 4503560
}
}
步驟4：配置和部署網橋Oracle
1、轉到“Oracle資料夾”
$ cd ../oracle
2、在./.env中建立配置檔案
注意1：開啟儲存的JSON檔案bridgeDeploymentResults.json以獲取本地和外部橋接合約地址和部署區塊編號。
{
"homeBridge": {
"address": "0xc4e7cA947521f331969e41CC7c99ADa22F2C7F9C",
"deployedBlockNumber": 9044640,
"erc677": {
"address": "0xEa3acD04DdaF1F1A5Ae1B9f5f690123aA4E19B36"
}
},
"foreignBridge": {
"address": "0xeb2dbC5AB9380A3517AcA9d8CA0c39873e569a93",
"deployedBlockNumber": 4503560
}
}
注2：要更改以下屬性
<PRIVATE_KEY>負責部署，管理合同和驗證轉移的帳戶
<ACCOUNT_ADMIN>負責部署，管理合同和驗證轉移的帳戶
<ERC20_TOKEN_ADDRESS>上面部署的ERC20令牌的地址。
注3：出於本教程的原因，我們決定儘可能簡化配置（一個帳戶管理和驗證）
注意4：確保帳戶ACCOUNT_ADMIN由RinkeBy ethers和POA sokol ethers資助。
BRIDGE_MODE=ERC_TO_ERC
HOME_POLLING_INTERVAL=5000
FOREIGN_POLLING_INTERVAL=1000
ALLOW_HTTP=yes
HOME_RPC_URL=https://sokol.poa.network
FOREIGN_RPC_URL=https://rinkeby.infura.io
HOME_BRIDGE_ADDRESS=<bridgeDeploymentResults.json / homeBridge / address>
FOREIGN_BRIDGE_ADDRESS=<bridgeDeploymentResults.json / foreignBridge / address>
ERC20_TOKEN_ADDRESS=<ERC20_TOKEN_ADDRESS>
VALIDATOR_ADDRESS=<ACCOUNT_ADMIN>
VALIDATOR_ADDRESS_PRIVATE_KEY=<PRIVATE_KEY>
HOME_GAS_PRICE_ORACLE_URL=https://gasprice.poa.network/
HOME_GAS_PRICE_SPEED_TYPE=standard
HOME_GAS_PRICE_FALLBACK=1000000000
HOME_GAS_PRICE_UPDATE_INTERVAL=600000
FOREIGN_GAS_PRICE_ORACLE_URL=https://gasprice.poa.network/
FOREIGN_GAS_PRICE_SPEED_TYPE=standard
FOREIGN_GAS_PRICE_FALLBACK=1000000000
FOREIGN_GAS_PRICE_UPDATE_INTERVAL=600000
QUEUE_URL=amqp://rabbit
REDIS_URL=redis://redis:6379
REDIS_LOCK_TTL=1000
HOME_START_BLOCK=<bridgeDeploymentResults.json / homeBridge / deployedBlockNumber>
FOREIGN_START_BLOCK=<bridgeDeploymentResults.json / foreignBridge / deployedBlockNumber>
LOG_LEVEL=info
MAX_PROCESSING_TIME=20000
3、構建並執行Bridge Oracle（使用Docker和Docker Compose）
這個Docker包由Reddit資料庫、Rabbit MQ代理和Nodejs Workers組成。
$ docker-compose up --build
使用標誌-d在後臺執行Bridge Oracle（守護程序）
步驟5：配置和部署橋UI
最後一步是部署使用者介面以在側鏈和主鏈之間傳輸daibi 。
1、定位到資料夾ui
$ cd ../ui
2、在./.env中建立配置檔案
注意1：開啟儲存的JSON檔案bridgeDeploymentResults.json以獲取本地和外部橋接合約地址和部署區塊編號。
{
"homeBridge": {
"address": "0xc4e7cA947521f331969e41CC7c99ADa22F2C7F9C",
"deployedBlockNumber": 9044640,
"erc677": {
"address": "0xEa3acD04DdaF1F1A5Ae1B9f5f690123aA4E19B36"
}
},
"foreignBridge": {
"address": "0xeb2dbC5AB9380A3517AcA9d8CA0c39873e569a93",
"deployedBlockNumber": 4503560
}
}
REACT_APP_HOME_BRIDGE_ADDRESS=<bridgeDeploymentResults.json / homeBridge / address>
REACT_APP_FOREIGN_BRIDGE_ADDRESS=<bridgeDeploymentResults.json / foreignBridge / address>
REACT_APP_HOME_HTTP_PARITY_URL=https://sokol.poa.network
REACT_APP_FOREIGN_HTTP_PARITY_URL=https://rinkeby.infura.io/mew
3、執行網橋UI
$ npm start
開啟您的Internet瀏覽器，使用用於部署BRT代幣的帳戶解鎖Rinkeby網路上的Metamask，然後轉到http：// localhost：3000 /
如果您在Rinkeby網路上，您應該看到您在主鏈（Rinkeby）上擁有100個BRT代幣，在側鏈（Poa Sokol）上擁有0個BR代幣。
您現在可以在主鏈和側鏈之間傳輸BRT代幣：
