搭建Dapp(分布式应用)
非常不情愿的安装npm,然后sudo npm install -g truffle
会出现一个很NB的动画安装过程，默默地欣赏…
71j.cn@ubuntu:~$ mkdir dapp
71j.cn@ubuntu:~$ cd dapp
truffle unbox webpack # 初始化一个带ui的truffle项目
/usr/bin/env: ‘node’: No such file or directory
sudo ln -s /usr/bin/nodejs /usr/bin/node
又报错：
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
因为 node的版本太低
sudo npm install -g n
sudo n stable
再来truffle unbox webpack，成功后可以看下当前的目录结构：
-contracts //智能合约存放目录
-migrations //智能合约abi及部署信息存目录
-test //测试文件
-truffle.js //truffle默认配置
-truffle-config.js //Windows下默认配置文件名与truffle冲突，可使用该文件解决
修改webpack.config.js，添加如下代码制定运行的服务器ip，注意如果只监听localhost, 理论上无法通过IP:PORT的方式访问。
devServer: {
host: ‘10.120.113.245’,
port: 8080,
},
配置truffle.js到私链：
module.exports = {
// See <http://truffleframework.com/docs/advanced/configuration>
// to customize your Truffle configuration!
networks: {
development: {
host: “10.120.113.245”,
port: 8101,
network_id: “*”, // * Match any network id
gas:4712388, //Gas limit used for deploys. Default is web3.eth.getBlock(“pending”).gasLimit==4712388.
gasPrice:18000000000, //Gas price used for deploys. Default is 100000000000 (100 Shannon).
from: “0xf4182f0dc92313f8e106fc033641c3351703911f”//From address used during migrations. Defaults to the first available account provided by your Ethereum client.
// provider – web3 provider instance Truffle should use to talk to the Ethereum network.
// – function that returns a web3 provider instance (see below.)
// – if specified, host and port are ignored.
}
},
solc: {
optimizer: {
enabled: true,
runs: 200
}
},
};
truffle migrate # Build, compile, & deploy the dap
这个过程比较慢，耐心等待。
npm run dev
就可以通过浏览器http:// 10.120.113.245:8101访问了。
部署自己的合约程序
deploy//这都是要自己编写的，具体的看代码吧，点这里下载
├── app
│ ├── index.html
│ ├── javascripts
│ │ └── app.js
│ └── stylesheets
│ └── app.css
├── contracts
│ ├── Conference.sol
│ └── Migrations.sol//这个是truffle管理合约用的合约
└── test
└── conference.js
rm -rf dapp/app rm -rf dapp/contracts rm -rf dapp/test
然后把deploy中的文件都复制到dapp中，进入dapp:
71j.cn@ubuntu:~/dapp$ truffle migrate –reset
Using network ‘development’.
Running migration: 1_initial_migration.js
Replacing Migrations…
… 0x08a2db9ceda488eb534f4e0364dc21d569ad7a7d822c12f2007021ff67d8dc3b
Migrations: 0xec2264304e81fe2a3d5f3f316ecd627ea44c285d
Saving successful migration to network…
… 0xfa324a40aac5d0d89da7c05ddb5382bc2c56bd21e92a4f2b5b34325c526c7d5e
Saving artifacts…
Running migration: 2_deploy_contracts.js
Replacing Conference…
… 0x2c45e7be5c5a40770a99c4a59e1f09bdc69168c96d45be62e46c6ba053d77cda
Conference: 0x7d2c18809639c3a019e3b82c3ec39da526a8beb2
Saving successful migration to network…
… 0x37fe62d2822977d15a2261c28f599df0418e567b0a0ed38870e4d556d5f12d4c
Saving artifacts…
然后看看我们的测试用例编写的怎样？
appadmin@ubuntu:~/dapp$ truffle test
Using network ‘development’.
[ ‘0xf4182f0dc92313f8e106fc033641c3351703911f’,
‘0x899a969874bec249e4ef439c75adb0c358913b95’,
‘0x6797c39109ec4676d3b5dbb4dc76f1143a0f633a’ ]
Contract: Conference
✓ Initial conference settings should match (2068ms)
✓ Should update quota (3570ms)
1) Should let you buy a ticket
Events emitted during test:
—————————
Deposit(_from: 0x899a969874bec249e4ef439c75adb0c358913b95, _amount: 1000000000000000000)
—————————
✓ Should issue a refund by owner only (10310ms)
3 passing (20s)
1 failing
1) Contract: Conference Should let you buy a ticket:
AssertionError: Difference should be what was sent: expected 11001296558000000000 to equal ‘1000000000000000000’
at test/conference.js:63:11
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:118:7)
为什么有一个没通过？因为那哥们在挖矿呢…，把挖矿的改成account[3]就好了。
npm run dev
通过浏览器访问http:// 10.120.113.245:8101即可。