現成metaforce佛薩奇2.0系統原始碼搭建（開發案例）
使用API KEY，就可以訪問以太坊網路節點。
在.env檔案中新增Infura api key的配置:
INFURA_API_KEY="
MNEMONIC="你的mnemonic"
1.3 更新專案設定
接下來使用MNEMONIC與INFURA_API_KEY，更新專案的網路配置，以便連線到公共區塊鏈網路。
修改truffle-config.js檔案:
// 匯入dotenv庫創用於讀取`.env`檔案中的設定
require('dotenv').config();
// 匯入truffle-hdwallet-provider庫重建錢包
const HDWalletProvider = require('truffle-hdwallet-provider');
module.exports = {
networks: {
development: {
host: "127.0.0.1", // Localhost (default: n
使用API KEY，就可以訪問以太坊網路節點。
在.env檔案中新增Infura api key的配置:
INFURA_API_KEY="
MNEMONIC="你的mnemonic"
1.3 更新專案設定
接下來使用MNEMONIC與INFURA_API_KEY，更新專案的網路配置，以便連線到公共區塊鏈網路。
修改truffle-config.js檔案:
// 匯入dotenv庫創用於讀取`.env`檔案中的設定
require('dotenv').config();
// 匯入truffle-hdwallet-provider庫重建錢包
const HDWalletProvider = require('truffle-hdwallet-provider');
module.exports = {
networks: {
development: {
host: "127.0.0.1", // Localhost (default: none)
port: 7545, // Standard Ethereum port (default: none)
network_id: "*", // Any network (default: none)
},
// Useful for deploying to a public network.
// NB: It's important to wrap the provider as a function.
kovan: {
provider: () => new HDWalletProvider(
process.env.MNEMONIC,
process.env.INFURA_API_KEY
),
gas: 5000000,
gasPrice: 25000000000,
network_id: 42
},
},
solc: {
optimizer: {
enabled: true,
runs: 200
}
}
}
可以看到，我們使用了.env配置檔案中的MNEMONIC與INFURA_API_KEY配置了kovan網路。
由於用到了dotenv與truffle-hdwallet-provider這2個庫，我們需要先安裝：
切換到專案目錄，執行以下命令
npm install dotenv --save-dev
npm install truffle-hdwallet-provider --save-dev
注意 安裝truffle-hdwallet-provider時，如果出現node-gyp相關的錯誤，可參考這裡解決。
1.4 訪問以太坊節點
使用truffle console連線到公共區塊鏈網路：
$ truffle console --network kovan
要驗證連線，可以從區塊鏈中讀取一些資料，獲取一些關於最新區塊的資訊，在控制檯上執行：
web3.eth.getBlock('latest').then(console.log)
輸出:
{ author: '0x03801efb0efe2a25ede5dd3a003ae880c0292e4d',
difficulty: '340282366920938463463374607431768211454',
extraData:
'0xde830206028f5061726974792d457468657265756d86312e33362e30826c69',
gasLimit: '0x7a1200',
gasUsed: '0x17d23',
hash:
'0xc7390c4f492c8c1da60608135fc9e05930123b645b39f221cba33d8b3c577b2a',
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000080000000000000000000100000008000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400800000000000010000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000008000000',
receiptsRoot:
'0x3d05bb2ed4fcc90234eea6d840e7d0e3ce7f598a15e5314536b17bcd11c78b5b',
sealFields:
[ '0x84175e8801',
'0xb84155a8cdb108dccec1d314124058fa6f22e7400ee200db0a94b7b165e4c3454c1818cc05f815cb7ce48f7a88b8401515740311a3566d9cf079428d506a6daca50101' ],
sha3Uncles:
'0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
signature:
'55a8cdb108dccec1d314124058fa6f22e7400ee200db0a94b7b165e4c3454c1818cc05f815cb7ce48f7a88b8401515740311a3566d9cf079428d506a6daca50101',
size: 877,
stateRoot:
'0x03af5adce52a81ce5d332cddb9955e344214bff00859b78868116e1e839efdf7',
step: '392071169',
timestamp: 1568284676,
totalDifficulty: '4524524338444961608702071789512829094373049115',
transactions:
[ '0xded7fed0842fd65ec808bc3652ec4175bc190acc11345c49c44b1fb5d954610f',
'0x7e9112a46fa3c07aad813ea86355b15eebb44023c040d198ee7d15d379bbc2be' ],
transactionsRoot:
'0x0dd10d90686dda2684bd0ba70d1c9e1d9a5302c30ca75eb2c5b07a7b6e4498b9',
uncles: [] }
可以看到，已經成功連線到了公鏈。
2. 部署智慧合約到公鏈
現在，我們將智慧合約部署到公鏈。步驟如下：
部署需要消耗Gas，獲取測試以太幣用於部署
部署智慧合約
驗證部署
2.1獲取測試以太幣
部署需要消耗Gas，Gas需要支付以太幣，我們部署到的是公鏈測試網Kovan，網路中的以太幣沒有市場價值。
開啟Ganache並複製列表中第一個帳戶的地址(錢包地址)，類似下面所示：
2.2 部署智慧合約
執行部署命令：
truffle migrate --network kovan
一旦部署完成，應該會看到部署成功的訊息。
部署命令執行詳情：
G:\qikegu\ethereum\mydapp>truffle migrate --network kovan
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Migrations dry-run (simulation)
===============================
> Network name: 'kovan-fork'
> Network id: 42
> Block gas limit: 0x7a1200
...
Starting migrations...
======================
> Network name: 'kovan'
> Network id: 42
> Block gas limit: 0x7a1200
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0x7e30b5c716afed45888a9dd2d6af7e6f52a9fade0346e8ad7d0c268de508a26a
> Blocks: 2 Seconds: 9
> contract address: 0x168A7247B58786edd259502948f5Bf9449C863AD
> block number: 13447029
> block timestamp: 1568294312
> account: 0x29920e756f41F8e691aE0b12D417C19204371E91
> balance: 2.993465175
> gas used: 261393
> gas price: 25 gwei
> value sent: 0 ETH
> total cost: 0.006534825 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.006534825 ETH
2_deploy_contracts.js
=====================
Deploying 'MyContract'
----------------------
> transaction hash: 0xc1f7ec8fee1a23e3d08d0c9e9d6e15fef24feb8ba163e0071dccb1bb90cc0eca
> Blocks: 0 Seconds: 0
> contract address: 0x4D3CFaF8457CEA76c0409f989f9870115B4d2d82
> block number: 13447036
> block timestamp: 1568294340
> account: 0x29920e756f41F8e691aE0b12D417C19204371E91
> balance: 2.9850534
> gas used: 294448
> gas price: 25 gwei
> value sent: 0 ETH
> total cost: 0.0073612 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.0073612 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.013896025 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.013896025 ETH
2.3 驗證部署
現在開啟truffle控制檯，與kovan測試網路上的智慧合約進行互動:
$ truffle console --network kovan
在控制檯中執行：
truffle(kovan)> MyContract.deployed().then((c) => { contract = c })
然後：
truffle(kovan)> contract.get()
'myValue'
truffle(kovan)> contract.set("hello world")
{ tx:
'0x7bf63444f3a7bd70e981a7bd49228b1cf1a8c3754daf64c4c7765b8eee46bf37',
receipt:
{ blockHash:
'0xe03d0f43d85f4e41c18a90aa563ebda08899c6b9c38d0cd7779937046e2aed0c',
blockNumber: 13447763,
contractAddress: null,
cumulativeGasUsed: 33629,
from: '0x29920e756f41f8e691ae0b12d417c19204371e91',
gasUsed: 33629,
logs: [],
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
root: null,
status: true,
to: '0x4d3cfaf8457cea76c0409f989f9870115b4d2d82',
transactionHash:
'0x7bf63444f3a7bd70e981a7bd49228b1cf1a8c3754daf64c4c7765b8eee46bf37',
transactionIndex: 0,
rawLogs: [] },
logs: [] }
truffle(kovan)> contract.get()
'hello world'
可以看到智慧合約已經成功部署。
3. truffle指令碼
Truffle包含一個指令碼執行器，可對以太坊網路執行自定義指令碼。
讓我們建立一個指令碼並執行。
在專案根目錄下，建立script.js檔案，內容如下：
module.exports = function(callback) {
web3.eth.getBlock('latest').then(console.log)
}
該指令碼將從Kovan測試網路獲取最新區塊的資訊。
執行指令碼:
truffle exec script.js --network kovan
輸出：
{ author: '0x596e8221a30bfe6e7eff67fee664a01c73ba3c56',
difficulty: '340282366920938463463374607431768211454',
extraData:
'0xde830205058f5061726974792d457468657265756d86312e33362e30826c69',
gasLimit: '0x7a1200',
gasUsed: '0x5e61',
hash:
'0x225a1e0b13fd20396af60d049ce9bb94c2f3f7df06c7db260880b62c91997004',
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
miner: '0x596e8221A30bFe6e7eFF67Fee664A01C73BA3C56',
number: 13448162,
parentHash:
'0x28d00fd7b66771130ed98de5073c7797ee293e7bee4b546793a4b79171555066',
receiptsRoot:
'0x44617b5733ee59bde159af08ffd6edae36e0964f1724c333f3d1bef0808dee15',
sealFields:
[ '0x84175e95d7',
'0xb8412ed900e67f4a72925fb3b495efb3f547411f40d26e972cc0e8b2cf26e40cf84a545e0328199d4880b79c62670129a7db12ac58234bee0866c6376b46ab99e8a200' ],
sha3Uncles:
'0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
signature:
'2ed900e67f4a72925fb3b495efb3f547411f40d26e972cc0e8b2cf26e40cf84a545e0328199d4880b79c62670129a7db12ac58234bee0866c6376b46ab99e8a200',
size: 797,
stateRoot:
'0xe1bbaacfb950361bec70f4ad53a2605e1ac1d2ff0bfd913fe063dc6c5f3252a0',
step: '392074711',
timestamp: 1568298844,
totalDifficulty: '4525729278306228651801195598997744985609807728',
transactions:
[ '0xf1ae41eac6b32419bc62a6cde9cab4b4ca244899a3d49b4a2461bcf94f504176' ],
transactionsRoot:
'0xf08c8097ea946f84ce9594ce73648fc0f9f683adef105a5db00c5f1f15e61c2c',
uncles: [] }
下面的程式碼智慧合約MyContract中，讀取value值，將script.js指令碼檔案中的程式碼替換為:
const MyContract = artifacts.require("./MyContract.sol");
module.exports = async function(callback) {
const contract = await MyContract.deployed()
const value = await contract.get()
console.log("Value:", value)
}
執行指令碼:
truffle exec script.js --network kovan
輸出:
Value: hello world
指令碼執行器是一個非常有用的功能。
one)
port: 7545, // Standard Ethereum port (default: none)
network_id: "*", // Any network (default: none)
},
// Useful for deploying to a public network.
// NB: It's important to wrap the provider as a function.
kovan: {
provider: () => new HDWalletProvider(
process.env.MNEMONIC,
process.env.INFURA_API_KEY
),
gas: 5000000,
gasPrice: 25000000000,
network_id: 42
},
},
solc: {
optimizer: {
enabled: true,
runs: 200
}
}
}
可以看到，我們使用了.env配置檔案中的MNEMONIC與INFURA_API_KEY配置了kovan網路。
由於用到了dotenv與truffle-hdwallet-provider這2個庫，我們需要先安裝：
切換到專案目錄，執行以下命令
npm install dotenv --save-dev
npm install truffle-hdwallet-provider --save-dev
注意 安裝truffle-hdwallet-provider時，如果出現node-gyp相關的錯誤，可參考這裡解決。
1.4 訪問以太坊節點
使用truffle console連線到公共區塊鏈網路：
$ truffle console --network kovan
要驗證連線，可以從區塊鏈中讀取一些資料，獲取一些關於最新區塊的資訊，在控制檯上執行：
web3.eth.getBlock('latest').then(console.log)
輸出:
{ author: '0x03801efb0efe2a25ede5dd3a003ae880c0292e4d',
difficulty: '340282366920938463463374607431768211454',
extraData:
'0xde830206028f5061726974792d457468657265756d86312e33362e30826c69',
gasLimit: '0x7a1200',
gasUsed: '0x17d23',
hash:
'0xc7390c4f492c8c1da60608135fc9e05930123b645b39f221cba33d8b3c577b2a',
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000080000000000000000000100000008000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400800000000000010000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000008000000',
receiptsRoot:
'0x3d05bb2ed4fcc90234eea6d840e7d0e3ce7f598a15e5314536b17bcd11c78b5b',
sealFields:
[ '0x84175e8801',
'0xb84155a8cdb108dccec1d314124058fa6f22e7400ee200db0a94b7b165e4c3454c1818cc05f815cb7ce48f7a88b8401515740311a3566d9cf079428d506a6daca50101' ],
sha3Uncles:
'0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
signature:
'55a8cdb108dccec1d314124058fa6f22e7400ee200db0a94b7b165e4c3454c1818cc05f815cb7ce48f7a88b8401515740311a3566d9cf079428d506a6daca50101',
size: 877,
stateRoot:
'0x03af5adce52a81ce5d332cddb9955e344214bff00859b78868116e1e839efdf7',
step: '392071169',
timestamp: 1568284676,
totalDifficulty: '4524524338444961608702071789512829094373049115',
transactions:
[ '0xded7fed0842fd65ec808bc3652ec4175bc190acc11345c49c44b1fb5d954610f',
'0x7e9112a46fa3c07aad813ea86355b15eebb44023c040d198ee7d15d379bbc2be' ],
transactionsRoot:
'0x0dd10d90686dda2684bd0ba70d1c9e1d9a5302c30ca75eb2c5b07a7b6e4498b9',
uncles: [] }
可以看到，已經成功連線到了公鏈。
2. 部署智慧合約到公鏈
現在，我們將智慧合約部署到公鏈。步驟如下：
部署需要消耗Gas，獲取測試以太幣用於部署
部署智慧合約
驗證部署
2.1獲取測試以太幣
部署需要消耗Gas，Gas需要支付以太幣，我們部署到的是公鏈測試網Kovan，網路中的以太幣沒有市場價值。
可以從Kovan faucet Gitter聊天室獲取測試用的偽以太幣。只需把錢包地址傳送出去，約5分鐘內，有人會給你發測試用的偽以太幣。
開啟Ganache並複製列表中第一個帳戶的地址(錢包地址)，類似下面所示：
0x29920e756f41F8e691aE0b12D417C19204371E91
傳送到聊天室內，稍等片刻，你的賬號將收到一筆以太幣。
2.2 部署智慧合約
執行部署命令：
truffle migrate --network kovan
一旦部署完成，應該會看到部署成功的訊息。
部署命令執行詳情：
G:\qikegu\ethereum\mydapp>truffle migrate --network kovan
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Migrations dry-run (simulation)
===============================
> Network name: 'kovan-fork'
> Network id: 42
> Block gas limit: 0x7a1200
...
Starting migrations...
======================
> Network name: 'kovan'
> Network id: 42
> Block gas limit: 0x7a1200
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0x7e30b5c716afed45888a9dd2d6af7e6f52a9fade0346e8ad7d0c268de508a26a
> Blocks: 2 Seconds: 9
> contract address: 0x168A7247B58786edd259502948f5Bf9449C863AD
> block number: 13447029
> block timestamp: 1568294312
> account: 0x29920e756f41F8e691aE0b12D417C19204371E91
> balance: 2.993465175
> gas used: 261393
> gas price: 25 gwei
> value sent: 0 ETH
> total cost: 0.006534825 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.006534825 ETH
2_deploy_contracts.js
=====================
Deploying 'MyContract'
----------------------
> transaction hash: 0xc1f7ec8fee1a23e3d08d0c9e9d6e15fef24feb8ba163e0071dccb1bb90cc0eca
> Blocks: 0 Seconds: 0
> contract address: 0x4D3CFaF8457CEA76c0409f989f9870115B4d2d82
> block number: 13447036
> block timestamp: 1568294340
> account: 0x29920e756f41F8e691aE0b12D417C19204371E91
> balance: 2.9850534
> gas used: 294448
> gas price: 25 gwei
> value sent: 0 ETH
> total cost: 0.0073612 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.0073612 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.013896025 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.013896025 ETH
2.3 驗證部署
現在開啟truffle控制檯，與kovan測試網路上的智慧合約進行互動:
$ truffle console --network kovan
在控制檯中執行：
truffle(kovan)> MyContract.deployed().then((c) => { contract = c })
然後：
truffle(kovan)> contract.get()
'myValue'
truffle(kovan)> contract.set("hello world")
{ tx:
'0x7bf63444f3a7bd70e981a7bd49228b1cf1a8c3754daf64c4c7765b8eee46bf37',
receipt:
{ blockHash:
'0xe03d0f43d85f4e41c18a90aa563ebda08899c6b9c38d0cd7779937046e2aed0c',
blockNumber: 13447763,
contractAddress: null,
cumulativeGasUsed: 33629,
from: '0x29920e756f41f8e691ae0b12d417c19204371e91',
gasUsed: 33629,
logs: [],
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
root: null,
status: true,
to: '0x4d3cfaf8457cea76c0409f989f9870115b4d2d82',
transactionHash:
'0x7bf63444f3a7bd70e981a7bd49228b1cf1a8c3754daf64c4c7765b8eee46bf37',
transactionIndex: 0,
rawLogs: [] },
logs: [] }
truffle(kovan)> contract.get()
'hello world'
可以看到智慧合約已經成功部署。
3. truffle指令碼
Truffle包含一個指令碼執行器，可對以太坊網路執行自定義指令碼。
讓我們建立一個指令碼並執行。
在專案根目錄下，建立script.js檔案，內容如下：
module.exports = function(callback) {
web3.eth.getBlock('latest').then(console.log)
}
該指令碼將從Kovan測試網路獲取最新區塊的資訊。
執行指令碼:
truffle exec script.js --network kovan
輸出：
{ author: '0x596e8221a30bfe6e7eff67fee664a01c73ba3c56',
difficulty: '340282366920938463463374607431768211454',
extraData:
'0xde830205058f5061726974792d457468657265756d86312e33362e30826c69',
gasLimit: '0x7a1200',
gasUsed: '0x5e61',
hash:
'0x225a1e0b13fd20396af60d049ce9bb94c2f3f7df06c7db260880b62c91997004',
logsBloom:
'0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
miner: '0x596e8221A30bFe6e7eFF67Fee664A01C73BA3C56',
number: 13448162,
parentHash:
'0x28d00fd7b66771130ed98de5073c7797ee293e7bee4b546793a4b79171555066',
receiptsRoot:
'0x44617b5733ee59bde159af08ffd6edae36e0964f1724c333f3d1bef0808dee15',
sealFields:
[ '0x84175e95d7',
'0xb8412ed900e67f4a72925fb3b495efb3f547411f40d26e972cc0e8b2cf26e40cf84a545e0328199d4880b79c62670129a7db12ac58234bee0866c6376b46ab99e8a200' ],
sha3Uncles:
'0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
signature:
'2ed900e67f4a72925fb3b495efb3f547411f40d26e972cc0e8b2cf26e40cf84a545e0328199d4880b79c62670129a7db12ac58234bee0866c6376b46ab99e8a200',
size: 797,
stateRoot:
'0xe1bbaacfb950361bec70f4ad53a2605e1ac1d2ff0bfd913fe063dc6c5f3252a0',
step: '392074711',
timestamp: 1568298844,
totalDifficulty: '4525729278306228651801195598997744985609807728',
transactions:
[ '0xf1ae41eac6b32419bc62a6cde9cab4b4ca244899a3d49b4a2461bcf94f504176' ],
transactionsRoot:
'0xf08c8097ea946f84ce9594ce73648fc0f9f683adef105a5db00c5f1f15e61c2c',
uncles: [] }
下面的程式碼智慧合約MyContract中，讀取value值，將script.js指令碼檔案中的程式碼替換為:
const MyContract = artifacts.require("./MyContract.sol");
module.exports = async function(callback) {
const contract = await MyContract.deployed()
const value = await contract.get()
console.log("Value:", value)
}
執行指令碼:
truffle exec script.js --network kovan
輸出:
Value: hello world
指令碼執行器是一個非常有用的功能。
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/70010128/viewspace-2937167/，如需轉載，請註明出處，否則將追究法律責任。
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