Solidity:如何在 compile.js 文件中编译多个智能合约?

Question

我想在一个编译.js文件中编译多个合约，但我不确定该怎么做。

我的编译.js文件只有一个合约，如下所示：

const path = require('path');
const fs = require('fs');
const solc = require('solc');
const lotteryPath = path.resolve(__dirname, 'contracts', 'Lottery.sol');
const source = fs.readFileSync(lotteryPath, 'utf8');
module.exports = solc.compile(source, 1);

如何在编译.js文件中添加更多合约？我知道 1 必须更改为合同数量，但不确定还需要什么？

Answer 1

这是我做的一个例子。你可以在我的公共存储库中找到它。简而言之，我有一个"build"文件夹，我将每个编译合约的输出写入 Json 文件。

const path = require("path"); //nodejs ’path’ module
const solc = require("solc"); //solidity compiler module
const fs = require("fs-extra"); //file system module
// Feth path of build
const buildPath = path.resolve(__dirname, "build");
const contractspath = path.resolve(__dirname, "contracts");
// Removes folder build and every file in it
fs.removeSync(buildPath);
// Fetch all Contract files in Contracts folder
const fileNames = fs.readdirSync(contractspath);
// Gets ABI of all contracts into variable input
const input = fileNames.reduce(
(input, fileName) => {
const filePath = path.resolve(__dirname, "contracts", fileName);
const source = fs.readFileSync(filePath, "utf8");
return { sources: { ...input.sources, [fileName]: source } };
},
{ sources: {} }
);
// Compile all contracts
const output = solc.compile(input, 1).contracts;
// Re-Create build folder for output files from each contract
fs.ensureDirSync(buildPath);
// Output contains all objects from all contracts
// Write the contents of each to different files
for (let contract in output) {
fs.outputJsonSync(
path.resolve(buildPath, contract.split(":")[1] + ".json"),
output[contract]
);
}

基本上，如果你不将路径结构更改为我的，则必须更改上述代码的这一部分：

// Feth path of build
const buildPath = path.resolve(__dirname, "build");
const contractspath = path.resolve(__dirname, "contracts");

Answer 2

批准的解决方案不适用于坚固性>0.6.0和<=0.8.1。

对于提到的版本，我按如下方式解决：

const path = require("path");
const fs = require("fs-extra");
const solc = require("solc");
const buildPath = path.resolve(__dirname, "build");
fs.removeSync(buildPath);
const contractPath = path.resolve(__dirname, "contracts");
const fileNames = fs.readdirSync(contractPath);
const compilerInput = {
language: "Solidity",
sources: fileNames.reduce((input, fileName) => {
const filePath = path.resolve(contractPath, fileName);
const source = fs.readFileSync(filePath, "utf8");
return { ...input, [fileName]: { content: source } };
}, {}),
settings: {
outputSelection: {
"*": {
"*": ["abi", "evm.bytecode.object"],
},
},
},
};
// Compile All contracts
const compiled = JSON.parse(solc.compile(JSON.stringify(compilerInput)));
fs.ensureDirSync(buildPath);
fileNames.map((fileName) => {
const contracts = Object.keys(compiled.contracts[fileName]);
contracts.map((contract) => {
fs.outputJsonSync(
path.resolve(buildPath, contract + ".json"),
compiled.contracts[fileName][contract]
);
});
});

请务必检查您的pragma solidity x.x.x是否与package.json中指定的版本匹配。例如，如果我使用solidity 0.6.12我的 solidity 编译将是：

"dependencies": {
...
"solc": "^0.6.12",
...
}

Answer 3

编译.js：

const path= require('path');
const solc = require('solc');
const fs = require('fs-extra');
const builtPath = path.resolve(__dirname, 'build');
//remove file in build module
fs.removeSync(builtPath);
const healthPath = path.resolve(__dirname, 'contract','health.sol');
//read  content present in file
console.log(healthPath);
const source = fs.readFileSync(healthPath,'utf8');
//compile contract
const output = solc.compile(source,1).contracts;
//create build folder
fs.ensureDirSync(builtPath);
console.log(output);

for(let contract in output)
{
fs.outputJsonSync(
path.resolve(buildPath, contract.replace(':','')+ '.json'),
output[contract]
);
}