109 lines
3.3 KiB
JavaScript
109 lines
3.3 KiB
JavaScript
var _ = require('underscore')
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, Step = require('step')
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, pg = require('pg');//.native; // disabled for now due to: https://github.com/brianc/node-postgres/issues/48
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_.mixin(require('underscore.string'));
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// PSQL
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//
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// A simple postgres wrapper with logic about username and database to connect
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//
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// * intended for use with pg_bouncer
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// * defaults to connecting with a "READ ONLY" user to given DB if not passed a specific user_id
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var PSQL = function(user_id, db, limit, offset){
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var error_text = "Incorrect access parameters. If you are accessing via OAuth, please check your tokens are correct. For public users, please ensure your table is published."
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if (!_.isString(user_id) && !_.isString(db)) throw new Error(error_text);
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var me = {
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public_user: "publicuser"
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, user_id: user_id
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, db: db
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, limit: limit
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, offset: offset
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, client: null
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};
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me.username = function(){
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var username = this.public_user;
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if (_.isString(this.user_id))
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username = _.template(global.settings.db_user, {user_id: this.user_id});
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return username;
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};
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me.database = function(){
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var database = db;
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if (_.isString(this.user_id))
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database = _.template(global.settings.db_base_name, {user_id: this.user_id});
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return database;
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};
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// memoizes connection in object. move to proper pool.
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me.connect = function(callback){
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var that = this
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var conString = "tcp://" + this.username() + "@" + global.settings.db_host + ":" + global.settings.db_port + "/" + this.database();
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if (that.client) {
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return callback(null, that.client);
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} else {
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var err = null;
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var client = new pg.Client(conString);
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client.connect();
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that.client = client;
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return callback(err, client);
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}
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};
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me.query = function(sql, callback){
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var that = this;
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Step(
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function(){
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that.sanitize(sql, this);
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},
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function(err, clean){
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if (err) throw err;
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that.connect(this);
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},
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function(err, client){
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if (err) return callback(err, null);
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client.query(that.window_sql(sql), this);
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},
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function(err, res){
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//if (err) console.log(err);
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callback(err, res)
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}
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);
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};
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me.end = function(){
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this.client.end();
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};
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// little hack for UI
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me.window_sql = function(sql){
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// only window select functions
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if (_.isNumber(this.limit) && _.isNumber(this.offset) && /^\s*SELECT.*$/.test(sql.toUpperCase())){
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return "SELECT * FROM (" + sql + ") AS cdbq_1 LIMIT " + this.limit + " OFFSET " + this.offset;
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} else {
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return sql;
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}
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};
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// throw exception if system table detected
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me.sanitize = function(sql, callback){
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if (sql.match(/\s+pg_.+/)){
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var error = new SyntaxError("system tables are forbidden");
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error.http_status = 403;
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throw error;
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} else {
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callback(null,true);
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}
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};
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return me;
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};
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module.exports = PSQL;
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