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index.js
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index.js
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"use strict";
const AWS = require('aws-sdk');
const fs = require('fs');
const path = require('path');
const fsp = require('fs-promise');
const exec = require('child_process').exec;
const s3 = new AWS.S3({
apiVersion: '2006-03-01'
});
function AppNotFoundError(message) {
let error = new Error(message);
error.name = 'AppNotFoundError';
return error;
}
/*
* Downloader class that downloads the latest version of the deployed
* app from S3 and unzips it.
*/
class S3Downloader {
constructor(options) {
this.ui = options.ui;
this.configBucket = options.bucket;
this.configKey = options.key;
}
download() {
if (!this.configBucket || !this.configKey) {
this.ui.writeError('no S3 bucket or key provided; not downloading app');
return Promise.reject(new AppNotFoundError());
}
return this.fetchCurrentVersion()
.then(() => this.removeOldApp())
.then(() => this.downloadAppZip())
.then(() => this.unzipApp())
.then(() => this.installNPMDependencies())
.then(() => this.outputPath);
}
removeOldApp() {
this.ui.writeLine('removing ' + this.outputPath);
return fsp.remove(this.outputPath);
}
fetchCurrentVersion() {
let bucket = this.configBucket;
let key = this.configKey;
this.ui.writeLine('fetching current app version from ' + bucket + '/' + key);
let params = {
Bucket: bucket,
Key: key
};
return s3.getObject(params).promise()
.then(data => {
let config = JSON.parse(data.Body);
this.ui.writeLine('got config', config);
this.appBucket = config.bucket;
this.appKey = config.key;
this.zipPath = path.basename(config.key);
this.outputPath = outputPathFor(this.zipPath);
});
}
downloadAppZip() {
return new Promise((res, rej) => {
let bucket = this.appBucket;
let key = this.appKey;
let params = {
Bucket: bucket,
Key: key
};
let zipPath = this.zipPath;
let file = fs.createWriteStream(zipPath);
let request = s3.getObject(params);
this.ui.writeLine("saving S3 object " + bucket + "/" + key + " to " + zipPath);
request.createReadStream().pipe(file)
.on('close', res)
.on('error', rej);
});
}
unzipApp() {
let zipPath = this.zipPath;
return this.exec('unzip ' + zipPath)
.then(() => {
this.ui.writeLine("unzipped " + zipPath);
});
}
installNPMDependencies() {
return this.exec(`cd ${this.outputPath} && npm install`)
.then(() => this.ui.writeLine('installed npm dependencies'))
.catch(() => this.ui.writeError('unable to install npm dependencies'));
}
exec(command) {
return new Promise((resolve, reject) => {
exec(command, (error, stdout, stderr) => {
if (error) {
this.ui.writeError(`error running command ${command}`);
this.ui.writeError(stderr);
reject(error);
} else {
resolve();
}
});
});
}
}
function outputPathFor(zipPath) {
let name = path.basename(zipPath, '.zip');
// Remove MD5 hash
return name.split('-').slice(0, -1).join('-');
}
module.exports = S3Downloader;