75 lines
2.1 KiB
JavaScript
75 lines
2.1 KiB
JavaScript
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/*global require,module,process*/
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var postgres = require('pg');
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var winston = require('winston');
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(function () {
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'use strict';
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// A postgres document store
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var PostgresDocumentStore = function (options) {
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this.expireJS = options.expire * 1000;
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this.connectionString = process.env.DATABASE_URL;
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};
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PostgresDocumentStore.prototype = {
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// Set a given key
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set: function (key, data, callback, skipExpire) {
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var now = new Date().getTime() / 1000;
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var that = this;
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this.safeConnect(function (err, client, done) {
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if (err) { return callback(false); }
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client.query('INSERT INTO entries (key, value, expiration) VALUES ($1, $2, $3)', [
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key,
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data,
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that.expireJS && !skipExpire ? now + that.expireJS : null
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], function (err, result) {
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if (err) {
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winston.error('error persisting value to postgres', { error: err });
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return callback(false);
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}
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callback(true);
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done();
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});
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});
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},
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// Get a given key's data
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get: function (key, callback, skipExpire) {
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var now = new Date().getTime() / 1000;
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var that = this;
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this.safeConnect(function (err, client, done) {
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if (err) { return callback(false); }
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client.query('SELECT value from entries where KEY = $1 AND (expiration IS NULL or expiration < $2)', [
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key,
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that.expireJS ? now - that.expireJS : 0
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], function (err, result) {
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if (err) {
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winston.error('error retrieving value from postgres', { error: err });
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return callback(false);
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}
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callback(result.rows.length ? result.rows[0].value : false);
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});
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});
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},
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// A connection wrapper
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safeConnect: function (callback) {
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postgres.connect(this.connectionString, function (err, client, done) {
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if (err) {
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winston.error('error connecting to postgres', { error: err });
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callback(err);
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} else {
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callback(undefined, client, done);
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}
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});
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}
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};
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module.export = PostgresDocumentStore;
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}());
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