haste-server/lib/document_stores/postgres.js

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/*global require,module,process*/
var postgres = require('pg');
var winston = require('winston');
// create table entries (id serial primary key, key varchar(255) not null, value text not null, expiration int, unique(key));
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// A postgres document store
var PostgresDocumentStore = function (options) {
this.expireJS = options.expire;
this.connectionUrl = process.env.DATABASE_URL || options.connectionUrl;
};
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PostgresDocumentStore.prototype = {
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// Set a given key
set: function (key, data, callback, skipExpire) {
var now = Math.floor(new Date().getTime() / 1000);
var that = this;
this.safeConnect(function (err, client, done) {
if (err) { return callback(false); }
client.query('INSERT INTO entries (key, value, expiration) VALUES ($1, $2, $3)', [
key,
data,
that.expireJS && !skipExpire ? that.expireJS + now : null
], function (err, result) {
if (err) {
winston.error('error persisting value to postgres', { error: err });
return callback(false);
}
callback(true);
done();
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});
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});
},
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// Get a given key's data
get: function (key, callback, skipExpire) {
var now = Math.floor(new Date().getTime() / 1000);
var that = this;
this.safeConnect(function (err, client, done) {
if (err) { return callback(false); }
client.query('SELECT id,value,expiration from entries where KEY = $1 and (expiration IS NULL or expiration > $2)', [key, now], function (err, result) {
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if (err) {
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winston.error('error retrieving value from postgres', { error: err });
return callback(false);
}
callback(result.rows.length ? result.rows[0].value : false);
if (result.rows.length && that.expireJS && !skipExpire) {
client.query('UPDATE entries SET expiration = $1 WHERE ID = $2', [
that.expireJS + now,
result.rows[0].id
], function (err, result) {
if (!err) {
done();
}
});
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} else {
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done();
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}
});
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});
},
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// A connection wrapper
safeConnect: function (callback) {
postgres.connect(this.connectionUrl, function (err, client, done) {
if (err) {
winston.error('error connecting to postgres', { error: err });
callback(err);
} else {
callback(undefined, client, done);
}
});
}
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};
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module.exports = PostgresDocumentStore;