s3-npm-cache/s3-npm-cache.js

Lightweight runtime to cache NPM dependencies in S3

/*
 S3 NPM Cache
 */

var md5 = require('md5-file'),
    path = require('path'),
    fs = require('fs'),
    process = require('./lib/process'),
    misc = require('./lib/misc'),
    os = require('os'),
    s3 = require('./lib/s3');

var init = function (s3BucketName, packageJsonFileLocation) {
    var packageJsonFile = packageJsonFileLocation + '/package.json',
        nodeModulesFolder = packageJsonFileLocation + '/node_modules',
        s3PackageName = md5.sync(packageJsonFile) + "-" + os.platform() + "-" + os.arch() + ".tar.gz";

    process.setProcessMetadata({
        packageJsonFileLocation: packageJsonFileLocation,
        packageJsonFile: packageJsonFile,
        nodeModulesFolder: nodeModulesFolder,
        s3PackageName: s3PackageName
    });

    if (misc.checkFileExists(nodeModulesFolder)) {
        console.log('Node modules already installed. Continuing...');

        return;
    }

    if (!s3.checkCredentials()) {
        console.warn('AWS credentials not found. Npm installing...');
        process.npmAction('install');

        return;
    }

    console.log('Attempting to retrieve ZIP file from S3 -', path.join(s3BucketName, s3PackageName));

    s3.setS3BucketName(s3BucketName);
    s3.getFileFromS3(s3PackageName)
        .then(process.unzipNodeModules)
        .catch(process.uploadNewFile);
};

module.exports = {
    init: init
};