haste-server/lib/document_stores/memcached.js

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const memcached = require('memcached');
const winston = require('winston');
class MemcachedDocumentStore {
// Create a new store with options
constructor(options) {
this.expire = options.expire;
const host = options.host || '127.0.0.1';
const port = options.port || 11211;
const url = `${host}:${port}`;
this.connect(url);
}
// Create a connection
connect(url) {
this.client = new memcached(url);
winston.info(`connecting to memcached on ${url}`);
this.client.on('failure', function(error) {
winston.info('error connecting to memcached', {error});
});
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}
// Save file in a key
set(key, data, callback, skipExpire) {
this.client.set(key, data, skipExpire ? 0 : this.expire, (error) => {
callback(!error);
});
}
// Get a file from a key
get(key, callback, skipExpire) {
this.client.get(key, (error, data) => {
callback(error ? false : data);
// Update the key so that the expiration is pushed forward
if (!skipExpire) {
this.set(key, data, (updateSucceeded) => {
if (!updateSucceeded) {
winston.error('failed to update expiration on GET', {key});
}
}, skipExpire);
}
});
}
}
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module.exports = MemcachedDocumentStore;