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packLambda.ts
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packLambda.ts
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import chalk from 'chalk';
import * as webpack from 'webpack';
import * as path from 'path';
import * as fs from 'fs';
import * as yazl from 'yazl';
import * as nodeExternals from 'webpack-node-externals';
import { existsOnS3 } from './existsOnS3';
import { publishToS3 } from './publishToS3';
import { hashDependencies } from './hashDependencies';
export enum WebpackMode {
development = 'development',
production = 'production',
none = 'none',
}
/**
* Packs the lambda and all of its inter-project dependencies using webpack and uploads it to S3
*/
export const packLambda = async (args: {
webpackConfig: string;
mode: WebpackMode;
srcDir: string;
outDir: string;
Bucket: string;
name: string;
src: string;
tsConfig: string;
}): Promise<{
name: string;
zipFileName: string;
dependencies: {
files: string[];
checksum: string;
hashes: { [key: string]: string };
};
}> => {
const { webpackConfig, mode, outDir, Bucket, name, src } = args;
try {
fs.statSync(args.src);
} catch (e) {
console.error(
chalk.red(
`The source file ${chalk.cyan(args.src)} for ${chalk.green(
name,
)} does not exist!`,
),
);
throw e;
}
const deps = await hashDependencies({
...args,
name,
});
const { checksum: hash, hashes } = deps;
const jsFilenameWithHash = `${name}-${hash}.js`;
const zipFilenameWithHash = `${name}-${hash}-layered.zip`;
const localPath = path.resolve(outDir, zipFilenameWithHash);
// Check if it already has been built and published
if (await existsOnS3(Bucket, zipFilenameWithHash, outDir)) {
console.error(chalk.green.dim(`${name} ✔️`));
return {
name,
zipFileName: zipFilenameWithHash,
dependencies: deps,
};
}
// Check if it already has been built locally
try {
fs.statSync(localPath);
console.error(chalk.green.dim(`${name} ✔️`));
// File exists
await publishToS3(Bucket, zipFilenameWithHash, localPath);
await existsOnS3(Bucket, zipFilenameWithHash, outDir);
return {
name,
zipFileName: zipFilenameWithHash,
dependencies: deps,
};
} catch (_) {}
// Check if file exists on S3
if (await existsOnS3(Bucket, zipFilenameWithHash, outDir)) {
console.error(chalk.yellow.dim(`${name} ✔️`));
return {
name,
zipFileName: zipFilenameWithHash,
dependencies: deps,
};
}
console.error(chalk.gray(`Packing lambda: ${chalk.green.bold(name)}`));
const start = Date.now();
await new Promise<string>(async (resolve, reject) => {
webpack(
{
entry: [src],
mode,
target: 'node',
externals: [nodeExternals()], // ignore all modules in node_modules folder
module: {
rules: [
{
test: /\.ts$/,
loader: 'ts-loader',
exclude: /node_modules/,
options: {
configFile: webpackConfig,
transpileOnly: true,
experimentalWatchApi: true,
},
},
],
},
optimization: {
removeAvailableModules: false,
removeEmptyChunks: false,
splitChunks: false,
},
resolve: {
extensions: ['.ts', '.ts', '.js'],
},
output: {
path: outDir,
libraryTarget: 'umd',
filename: jsFilenameWithHash,
},
},
async (err, stats) => {
if (err || stats.hasErrors()) {
console.error(chalk.red('webpack failed'));
console.error(err);
console.error(stats.toString());
return reject(err);
}
const f = path.resolve(outDir, jsFilenameWithHash);
const zipfile = new yazl.ZipFile();
zipfile.addFile(f, 'index.js');
zipfile.addBuffer(
Buffer.from(JSON.stringify(hashes, null, 2)),
'hashes.json',
);
zipfile.outputStream
.pipe(fs.createWriteStream(localPath))
.on('close', () => resolve());
zipfile.end();
},
);
});
console.error(
chalk.gray(
`${chalk.green('Done:')} ${chalk.green.bold(name)} ${chalk.blue(
`${Math.round(fs.statSync(localPath).size / 1024)}KB`,
)} ${chalk.blue(`${Math.round((Date.now() - start) / 1000)}s`)}`,
),
);
await publishToS3(Bucket, zipFilenameWithHash, localPath);
await existsOnS3(Bucket, zipFilenameWithHash, outDir);
return {
zipFileName: zipFilenameWithHash,
name,
dependencies: deps,
};
};