297 lines
8.7 KiB
JavaScript
297 lines
8.7 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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// Max database connections in the pool
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// Subsequent connections will block waiting for a free slot
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pg.defaults.poolSize = global.settings.db_pool_size || 16;
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// Milliseconds of idle time before removing connection from pool
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pg.defaults.poolIdleTimeout = global.settings.db_pool_idleTimeout || 30000;
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// Frequency to check for idle clients within the pool, ms
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pg.defaults.reapIntervalMillis = global.settings.db_pool_reapInterval || 1000;
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pg.on('error', function(err, client) {
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console.log("PostgreSQL connection error: " + err);
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});
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// Workaround for https://github.com/Vizzuality/CartoDB-SQL-API/issues/100
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var types = require(__dirname + '/../../node_modules/pg/lib/types');
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var arrayParser = require(__dirname + '/../../node_modules/pg/lib/types/arrayParser');
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var floatParser = function(val) {
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return parseFloat(val);
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};
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var floatArrayParser = function(val) {
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if(!val) { return null; }
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var p = arrayParser.create(val, function(entry) {
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return floatParser(entry);
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});
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return p.parse();
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};
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types.setTypeParser(20, floatParser); // int8
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types.setTypeParser(700, floatParser); // float4
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types.setTypeParser(701, floatParser); // float8
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types.setTypeParser(1700, floatParser); // numeric
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types.setTypeParser(1021, floatArrayParser); // _float4
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types.setTypeParser(1022, floatArrayParser); // _float8
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types.setTypeParser(1231, floatArrayParser); // _numeric
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types.setTypeParser(1016, floatArrayParser); // _int8
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// Standard type->name mappnig (up to oid=2000)
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var stdTypeName = {
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16: 'bool',
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17: 'bytea',
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20: 'int8',
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21: 'int2',
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23: 'int4',
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25: 'text',
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26: 'oid',
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114: 'JSON',
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700: 'float4',
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701: 'float8',
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1000: '_bool',
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1015: '_varchar',
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1042: 'bpchar',
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1043: 'varchar',
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1005: '_int2',
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1007: '_int4',
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1014: '_bpchar',
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1016: '_int8',
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1021: '_float4',
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1022: '_float8',
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1008: '_regproc',
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1009: '_text',
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1114: 'timestamp',
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1182: 'date',
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1184: 'timestampz',
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1186: 'interval',
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1231: '_numeric',
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1700: 'numeric'
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};
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// Holds a typeId->typeName mapping for each
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// database ever connected to
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var extTypeName = {};
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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) {
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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: global.settings.db_pubuser
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, user_id: user_id
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, db: db
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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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me.conString = "tcp://" + me.username() + "@" +
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global.settings.db_host + ":" +
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global.settings.db_port + "/" +
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me.database();
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me.ensureTypeCache = function(cb) {
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var db = this.db;
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if ( extTypeName[db] ) { cb(); return; }
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pg.connect(this.conString, function(err, client, done) {
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if ( err ) { cb(err); return; }
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var types = ["'geometry'","'raster'"]; // types of interest
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client.query("SELECT oid, typname FROM pg_type where typname in (" + types.join(',') + ")", function(err,res) {
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done();
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if ( err ) { cb(err); return; }
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var cache = {};
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res.rows.map(function(r) {
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cache[r.oid] = r.typname;
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});
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extTypeName[db] = cache;
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cb();
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});
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});
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}
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// Return type name for a type identifier
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//
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// Possibly returns undefined, for unkonwn (uncached)
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//
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me.typeName = function(typeId) {
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return stdTypeName[typeId] ? stdTypeName[typeId] : extTypeName[this.db][typeId];
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}
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me.connect = function(cb){
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var that = this;
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this.ensureTypeCache(function(err) {
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if ( err ) cb(err);
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else pg.connect(that.conString, cb);
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});
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};
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me.eventedQuery = 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, done){
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if (err) throw err;
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var query = client.query(sql);
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// NOTE: for some obscure reason passing "done" directly
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// as the listener works but can be slower
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// (by x2 factor!)
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query.on('end', function() { done(); });
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return query;
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},
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function(err, query){
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callback(err, query)
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}
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);
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};
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me.quoteIdentifier = function(str) {
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return pg.Client.prototype.escapeIdentifier(str);
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};
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me.escapeLiteral = function(s) {
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return pg.Client.prototype.escapeLiteral(str);
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};
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me.query = function(sql, callback){
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var that = this;
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var finish;
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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, done){
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if (err) throw err;
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finish = done;
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client.query(sql, this);
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},
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function(err, res){
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// Release client to the pool
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// should this be postponed to after the callback ?
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// NOTE: if we pass a true value to finish() the client
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// will be removed from the pool.
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// We don't want this. Not now.
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if ( finish ) finish();
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callback(err, res)
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}
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);
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};
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// throw exception if illegal operations are detected
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// NOTE: this check is weak hack, better database
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// permissions should be used instead.
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me.sanitize = function(sql, callback){
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// NOTE: illegal table access is checked in main app
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if (sql.match(/^\s+set\s+/i)){
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var error = new SyntaxError("SET command is forbidden");
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error.http_status = 403;
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callback(error);
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return;
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}
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callback(null,true);
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};
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return me;
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};
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// little hack for UI
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//
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// TODO:drop, fix in the UI (it's not documented in doc/API)
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//
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PSQL.window_sql = function(sql, limit, offset) {
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// only window select functions (NOTE: "values" will be broken, "with" will be broken)
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if (!_.isNumber(limit) || !_.isNumber(offset) ) return sql;
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var cte = '';
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if ( sql.match(/^\s*WITH\s/i) ) {
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var rem = sql; // analyzed portion of sql
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var q; // quote char
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var n = 0; // nested parens level
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var s = 0; // 0:outQuote, 1:inQuote
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var l;
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while (1) {
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l = rem.search(/[("')]/);
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//console.log("REM Is " + rem);
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if ( l < 0 ) {
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console.log("Malformed SQL");
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return sql;
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}
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var f = rem.charAt(l);
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//console.log("n:" + n + " s:" + s + " l:" + l + " charAt(l):" + f + " charAt(l+1):" + rem.charAt(l+1));
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if ( s == 0 ) {
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if ( f == '(' ) ++n;
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else if ( f == ')' ) {
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if ( ! --n ) { // end of CTE
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cte += rem.substr(0, l+1);
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rem = rem.substr(l+1);
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//console.log("Out of cte, rem is " + rem);
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if ( rem.search(/^s*,/) < 0 ) break;
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else continue; // cte and rem already updated
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}
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}
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else { // enter quoting
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s = 1; q = f;
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}
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}
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else if ( f == q ) {
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if ( rem.charAt(l+1) == f ) ++l; // escaped
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else s = 0; // exit quoting
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}
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cte += rem.substr(0, l+1);
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rem = rem.substr(l+1);
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}
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/*
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console.log("cte: " + cte);
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console.log("rem: " + rem);
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*/
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sql = rem; //sql.substr(l+1);
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}
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if ( sql.match(/^\s*SELECT\s/i) ) {
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return cte + "SELECT * FROM (" + sql + ") AS cdbq_1 LIMIT " + limit + " OFFSET " + offset;
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}
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return cte + sql;
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}
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module.exports = PSQL;
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