ethers.jsをconsoleから使えるタスクランナーbuidlers.devに触ってみる
サンプルのインストール
ローカルにbuidlerをインストール
yarn init
# global installするとtypescript互換モードが使えなくなる感あるのでローカルにいれます
yarn add --dev @nomiclabs/buidler
起動 (builderとtypoしても優しく訂正してくれる...はず）
yarn buidler
起動時のダイアログ
888 d8b 888 888
888 Y8P 888 888
888 888 888
88888b. 888 888 888 .d88888 888 .d88b. 888d888
888 "88b 888 888 888 d88" 888 888 d8P Y8b 888P"
888 888 888 888 888 888 888 888 88888888 888
888 d88P Y88b 888 888 Y88b 888 888 Y8b. 888
88888P" "Y88888 888 "Y88888 888 "Y8888 888
👷 Welcome to Buidler v1.0.1 👷
? What do you want to do? …
❯ Create a sample project # こいつを選択
Create an empty buidler.config.js
Quit
サンプルプロジェクトで使いたいライブラリをインストール
yarn add --save @nomiclabs/buidler-truffle5 @nomiclabs/buidler-web3 web3
# デフォルトで用意されているcompileタスクが実行される
yarn buidler compile
# contracts下がコンパイルされ、build下に成果物(artifactファイル）が生成される
コントラクトをコンパイルするとbuildしたにbuidlerのartifactファイルが生成される。build成果物自体はtruffleのものと違いコンパクトではあるが networks の項目がないのでこのファイル他のコンポーネントでコントラクトと通信するために使い回せるかは謎である。
{
"contractName": "Greeter",
"abi": [ /* 略 */ ],
"bytecode": "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",
"deployedBytecode": "0x608060405234801561001057600080fd5b50600436106100365760003560e01c8063a41368621461003b578063cfae3217146100f6575b600080fd5b6100f46004803603602081101561005157600080fd5b810190808035906020019064010000000081111561006e57600080fd5b82018360208201111561008057600080fd5b803590602001918460018302840111640100000000831117156100a257600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600081840152601f19601f820116905080830192505050505050509192919290505050610179565b005b6100fe610193565b6040518080602001828103825283818151815260200191508051906020019080838360005b8381101561013e578082015181840152602081019050610123565b50505050905090810190601f16801561016b5780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b806000908051906020019061018f929190610235565b5050565b606060008054600181600116156101000203166002900480601f01602080910402602001604051908101604052809291908181526020018280546001816001161561010002031660029004801561022b5780601f106102005761010080835404028352916020019161022b565b820191906000526020600020905b81548152906001019060200180831161020e57829003601f168201915b5050505050905090565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f1061027657805160ff19168380011785556102a4565b828001600101855582156102a4579182015b828111156102a3578251825591602001919060010190610288565b5b5090506102b191906102b5565b5090565b6102d791905b808211156102d35760008160009055506001016102bb565b5090565b9056fea265627a7a723158204b258d436f26c71ba0028877c11fb5e10e2229c35e34015e83b7ca402052b2ed64736f6c634300050b0032",
"linkReferences": {},
"deployedLinkReferences": {}
}
サンプルコード中に含まれているタスクの実行
truffle buidler accconts
# builder.config.jsにかかれているacccountsタスクが起動する
# 20個のアカウントが表示されるはず
デフォルトではBuidler EVM Networkに接続してコントラクトのデプロイやテストの実行などを行う。Builder EVMのネットワークはtaskを走らせる度に立ち上がる buidler.config.jsでよしなに gas や fromのアドレスを指定することができる。
buidler.config.jsの例
module.exports = {
defaultNetworks: "buidlerevm",
networks: {
localhost: {
url: 'http://127.0.0.1:8545'
},
buidlerevm: {
gas: 0,
gasPrice: 0,
accounts: [ // 指定しないと20個のアカウントに10000EHがデフォルトで付与されて用意される
{
privateKey: "0xB3BB3A1EB4EBAAE568DB332251B77F5A029E44DB3C1CA9F39056B29C86ADC62C",
balance: "0x" + `${55 * (10**10)}`,
}
],
blockGasLimit: 99 * (10**5),
hardfork: "constantinople",
},
},
};
デプロイ
run yarn buidler run scripts/sample-script.js
sample-script.jsは下記 Truffleとそれほど書き方は変わらない。artifactファイルを読み込んで諸々の操作を行う。ただスクリプトを走らせているだけなのでカスタマイズはTruffleのマイグレーションよりは効くだろう。ただし、順序制御的なものは導入されていない
// We require the Buidler Runtime Environment explicitly here. This is optional
// when running the script with `buidler run <script>`: you'll find the Buidler
// Runtime Environment's members available as global variable in that case.
const env = require("@nomiclabs/buidler");
async function main() {
// You can run Buidler tasks from a script.
// For example, we make sure everything is compiled by running "compile"
await env.run("compile");
// We require the artifacts once our contracts are compiled
const Greeter = env.artifacts.require("Greeter");
const greeter = await Greeter.new("Hello, world!");
console.log("Greeter address:", greeter.address);
}
// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main()
.then(() => process.exit(0))
.catch(error => {
console.error(error);
process.exit(1);
});
デプロイの出力
All contracts have already been compiled, skipping compilation.
All contracts have already been compiled, skipping compilation.
Greeter address: 0x7c2C195CD6D34B8F845992d380aADB2730bB9C6F
✨ Done in 3.41s.
buidlerは起動時にconfigファイルを指定できるので、ビルド対象のコントラクトディレクトリ、ビルド成果物の配備先などもよしなに切り替えることができる。一例としてsolidity 0.4.xと0.5.xを共存させる場合の例が公式チュートリアルには記載されている
builder.config_xxxx.js
module.exports = {
paths: {
sources: "./contracts/5", // 0.5系を配備するディレクトリ
// test
// cache
// artifacts
// root などを指定可能
}
/* この下にネットワークの設定など */
};
設定ファイルの読み替え
yarn buidler compile --config builder.config_xxxx.js
テスト実行時のスタックトレース
1) Contract: ERC721
like an ERC721
transfers
via safeTransferFrom
to a contract that does not implement the required function
reverts:
Error: Transaction reverted: function selector was not recognized and there's no fallback function
at ERC721Mock.<unrecognized-selector> (contracts/mocks/ERC721Mock.sol:9)
at ERC721Mock._checkOnERC721Received (contracts/token/ERC721/ERC721.sol:334)
at ERC721Mock._safeTransferFrom (contracts/token/ERC721/ERC721.sol:196)
at ERC721Mock.safeTransferFrom (contracts/token/ERC721/ERC721.sol:179)
at ERC721Mock.safeTransferFrom (contracts/token/ERC721/ERC721.sol:162)
at TruffleContract.safeTransferFrom (node_modules/@nomiclabs/truffle-contract/lib/execute.js:157:24)
at Context.<anonymous> (test/token/ERC721/ERC721.behavior.js:262:30)
2) Contract: ERC721
internal functions
_burn(address, uint256)
with minted token
with burnt token
reverts when burning a token id that has been deleted:
TypeError: this.token.methods.aurn(address,uint256) is not a function
at Context.<anonymous> (test/token/ERC721/ERC721.test.js:82:58)
at process._tickCallback (internal/process/next_tick.js:68:7)
同じテストをTruffleで実行したときの出力
1) Contract: ERC721
like an ERC721
transfers
via safeTransferFrom
to a contract that does not implement the required function
reverts:
Error: Returned error: VM Exception while processing transaction: revert
at PromiEvent (node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:9:1)
at TruffleContract.safeTransferFrom (node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:169:1)
at Context.<anonymous> (test/token/ERC721/ERC721.behavior.js:262:30)
2) Contract: ERC721
internal functions
_burn(address, uint256)
with minted token
with burnt token
reverts when burning a token id that has been deleted:
TypeError: this.token.methods.aurn(address,uint256) is not a function
at Context.<anonymous> (test/token/ERC721/ERC721.test.js:82:58)
at process._tickCallback (internal/process/next_tick.js:68:7)
と、たしかにTruffleよりも親切そうだ
