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<div class="content" data-ice="content"><h1 data-ice="title">src/component/cache-component.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">'use strict';
const npmEvents = require('./npm/events');
const CacheFactory = require('./cache/factory');
const DependencyBasedComponent = require('./dependency-based-component');
const Spinner = require('./helper/spinner');
const cacheEvents = require('./cache/events');
const prettyBytes = require('pretty-bytes');
const SequentialPromise = require('./helper/sequential-promise');
/**
* Cache component
*/
class CacheComponent extends DependencyBasedComponent {
/**
* @param {*} args
*/
constructor(...args) {
super(...args);
this._caches = [];
}
/**
* @returns {string}
*/
get name() {
return 'cache';
}
/**
* @returns {string[]}
*/
get dependencies() {
return [];
}
/**
* @returns {AbstractDriver[]}
*/
get caches() {
return this._caches;
}
/**
* @param {Emitter} emitter
*
* @returns {Promise}
*/
init(emitter) {
return Promise.all([
this._initCaches(emitter),
this._initNpmCache(emitter)
]);
}
/**
* @param {Emitter} emitter
*
* @returns {Promise}
*/
teardown(emitter) {
if (this.caches.length <= 0) {
return Promise.resolve();
}
return SequentialPromise.all(this.caches.map(cache => {
return () => this._uploadCache(cache);
}));
}
/**
* @param {Emitter} emitter
*
* @returns {Promise}
*
* @private
*/
_initCaches(emitter) {
const cachePaths = this.container.get('paths', []);
if (cachePaths.length <= 0) {
return Promise.resolve();
}
return SequentialPromise.all(cachePaths.map(cacheDir => {
return () => {
const cache = this._createCache(cacheDir);
this.caches.push(cache);
return this._downloadCache(cache);
};
}));
}
/**
* @param {Emitter} emitter
*
* @returns {Promise}
*
* @private
*/
_initNpmCache(emitter) {
const enabled = this.container.get('npm', true);
if (!enabled || !emitter.component('npm')) {
return Promise.resolve();
}
emitter.onBlocking(npmEvents.npm.cache.init, cacheDir => {
const npmCache = this._createCache(cacheDir);
this.caches.push(npmCache);
return this._downloadCache(npmCache);
});
return Promise.resolve();
}
/**
* @param {string} cacheDir
*
* @returns {AbstractDriver}
*
* @private
*/
_createCache(cacheDir) {
return CacheFactory.create(
this.container.get('driver'),
cacheDir,
...this.container.get('options', [])
);
}
/**
* @param {AbstractDriver} cache
*
* @returns {Promise}
*
* @private
*/
_downloadCache(cache) {
const spinner = new Spinner(`Downloading caches from #${ cache.name }`);
return spinner.then(
`Caches downloaded to ${ cache.cacheDir }`
).catch(
`Failed to download caches to ${ cache.cacheDir }`
).promise(
this._trackProgress(cache, spinner).download()
);
}
/**
* @param {AbstractDriver} cache
*
* @returns {Promise}
*
* @private
*/
_uploadCache(cache) {
const spinner = new Spinner(`Uploading caches to #${ cache.name }`);
return spinner.then(
`Caches uploaded from ${ cache.cacheDir }`
).catch(
`Failed to upload caches from ${ cache.cacheDir }`
).promise(
this._trackProgress(cache, spinner).upload()
);
}
/**
* @param {EventEmitter} emitter
* @param {ora} spinner
*
* @returns {EventEmitter}
*
* @private
*/
_trackProgress(emitter, spinner) {
emitter.on(cacheEvents.cache.upload.progress, payload => {
const { amount, total } = payload;
spinner.prepend(`[${ prettyBytes(amount) }/${ prettyBytes(total) }]`);
});
spinner.prepend(`[0/0]`);
return emitter;
}
}
module.exports = CacheComponent;
</code></pre>
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