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Script for setting up layer for a lambda containing node.js dependencies
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{ | |
"name": "my-lambda", | |
"private": true, | |
"version": "1.0.0", | |
"scripts": { | |
"prepare": "node prepare_layer.js", | |
"package": "yarn prepare && yarn sls package --stage production" | |
}, | |
"dependencies": { | |
"//": "...", | |
"@google-cloud/language": "^4.2.1" | |
} | |
} |
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const { mkdirSync, writeFileSync, unlinkSync, renameSync } = require('fs'); | |
const { execSync } = require('child_process'); | |
const { join } = require('path'); | |
const { externals = [] } = require('./webpack.config'); | |
const { dependencies = {} } = require('./package.json'); | |
const layerDir = join(__dirname, '.google-cloud-deps'); | |
const outputDir = join(layerDir, 'nodejs'); | |
// Prepare Output Directories | |
console.log('Preparing output directories'); | |
execSync(`rm -rf ${layerDir}`); | |
mkdirSync(outputDir, { recursive: true }); | |
// Write package.json for layer dependencies | |
console.log('Writing package.json with external dependencies'); | |
const dependenciesToPackage = Object.fromEntries( | |
Object.entries(dependencies).filter(([name]) => externals.includes(name)) | |
); | |
const outputPackageJson = join(layerDir, 'package.json'); | |
const outputPackageJsonContent = JSON.stringify({ dependencies: dependenciesToPackage }, null, 2); | |
console.log(outputPackageJsonContent); | |
writeFileSync(outputPackageJson, outputPackageJsonContent); | |
// Install dependencies and organize layer files | |
console.log('Installing dependencies and organizing layer structure'); | |
console.log(execSync('yarn --no-lockfile', { cwd: layerDir }).toString()); | |
renameSync(join(layerDir, 'node_modules'), join(outputDir, 'node_modules')); | |
// Cleanup files | |
console.log('Cleaning up output folder'); | |
unlinkSync(outputPackageJson); | |
// Voila! | |
console.log('Layer files ready!'); |
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# ... | |
layers: | |
GoogleCloudDeps: | |
path: .google-cloud-deps | |
compatibleRuntimes: | |
- nodejs12.x | |
functions: | |
my-lambda: | |
# ... | |
layers: | |
- Ref: GoogleCloudDepsLambdaLayer | |
# ... |
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const baseWebpack = require('../../webpack.config'); | |
module.exports = { | |
...baseWebpack, | |
externals: [...baseWebpack.externals, '@google-cloud/language'], | |
}; |
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