84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
var _ = require('underscore')
|
|
, pg = require('pg').native;
|
|
_.mixin(require('underscore.string'));
|
|
|
|
// PSQL
|
|
//
|
|
// A simple postgres wrapper with logic about username and database to connect
|
|
//
|
|
// * intended for use with pg_bouncer
|
|
// * defaults to connecting with a "READ ONLY" user to given DB if not passed a specific user_id
|
|
var PSQL = function(user_id, db, limit, offset){
|
|
|
|
var error_text = "Incorrect access parameters. If you are accessing via OAuth, please check your tokens are correct. For public users, please specify a database name."
|
|
if (!_.isString(user_id) && !_.isString(db)) throw new Error(error_text);
|
|
|
|
var me = {
|
|
public_user: "publicuser"
|
|
, user_id: user_id
|
|
, db: db
|
|
, limit: limit
|
|
, offset: offset
|
|
, client: null
|
|
};
|
|
|
|
me.username = function(){
|
|
var username = this.public_user;
|
|
if (_.isString(this.user_id))
|
|
username = _.template(global.settings.db_user, {user_id: this.user_id});
|
|
|
|
return username;
|
|
}
|
|
|
|
me.database = function(){
|
|
var database = db;
|
|
if (_.isString(this.user_id))
|
|
database = _.template(global.settings.db_base_name, {user_id: this.user_id});
|
|
|
|
return database;
|
|
}
|
|
|
|
// memoizes connection in object. move to proper pool.
|
|
me.connect = function(callback){
|
|
var that = this
|
|
var conString = "tcp://" + this.username() + "@" + global.settings.db_host + ":" + global.settings.db_port + "/" + this.database();
|
|
|
|
if (that.client) {
|
|
return callback(null, that.client);
|
|
} else {
|
|
pg.connect(conString, function(err, client){
|
|
that.client = client;
|
|
return callback(err, client);
|
|
});
|
|
}
|
|
}
|
|
|
|
me.query = function(sql, callback){
|
|
var that = this;
|
|
this.connect(function(err, client){
|
|
if (err) return callback(err, null);
|
|
client.query(that.window_sql(sql), function(err, result){
|
|
return callback(err, result)
|
|
});
|
|
});
|
|
};
|
|
|
|
me.end = function(){
|
|
this.client.end();
|
|
}
|
|
|
|
// little hack for UI
|
|
me.window_sql = function(sql){
|
|
// only window select functions
|
|
if (_.isNumber(this.limit) && _.isNumber(this.offset) && /^\s*SELECT.*$/.test(sql.toUpperCase())){
|
|
return "SELECT * FROM (" + sql + ") AS cdbq_1 LIMIT " + this.limit + " OFFSET " + this.offset;
|
|
} else {
|
|
return sql;
|
|
}
|
|
}
|
|
|
|
return me;
|
|
};
|
|
|
|
module.exports = PSQL;
|