PostgreSQL database driver (#5861)

* [test/database/list] Fix test list 4 being used in two different tests

* [database/postgres] PostgreSQL database driver

* [database/postgres] Make transactions work based on continuation scope.

* [database/postgres] Implement nested transactions

* eslint --fix

* Add database changes from earlier this week to the PostgreSQL driver.

* Fix typo

* Fix postgres.incrObjectFieldBy returning undefined instead of null when given NaN

* [database/postgres] Fix sortedSetsCard returning an array of strings.

* Update socket.io postgres adapter

* Fix PostgreSQL erroring when multiple updates are made to the same sorted set entry in a single operation.

Add a test case to catch this error.

* Fix lint errors.

* Only prune sessions on one instance in a cluster to avoid deadlocks.

They're caught and handled by the database server, but they spam the logs.

* Fix arguments.slice.

install/databases.js

@@ -7,6 +7,7 @@ var winston = require('winston');
 var questions = {
 	redis: require('../src/database/redis').questions,
 	mongo: require('../src/database/mongo').questions,
+	postgres: require('../src/database/postgres').questions,
 };
 
 module.exports = function (config, callback) {
@@ -38,6 +39,12 @@ function getDatabaseConfig(config, callback) {
 		} else {
 			prompt.get(questions.mongo, callback);
 		}
+	} else if (config.database === 'postgres') {
+		if (config['postgres:host'] && config['postgres:port']) {
+			callback(null, config);
+		} else {
+			prompt.get(questions.postgres, callback);
+		}
 	} else {
 		return callback(new Error('unknown database : ' + config.database));
 	}
@@ -69,11 +76,19 @@ function saveDatabaseConfig(config, databaseConfig, callback) {
 			database: databaseConfig['mongo:database'],
 			uri: databaseConfig['mongo:uri'],
 		};
+	} else if (config.database === 'postgres') {
+		config.postgres = {
+			host: databaseConfig['postgres:host'],
+			port: databaseConfig['postgres:port'],
+			username: databaseConfig['postgres:username'],
+			password: databaseConfig['postgres:password'],
+			database: databaseConfig['postgres:database'],
+		};
 	} else {
 		return callback(new Error('unknown database : ' + config.database));
 	}
 
-	var allQuestions = questions.redis.concat(questions.mongo);
+	var allQuestions = questions.redis.concat(questions.mongo).concat(questions.postgres);
 	for (var x = 0; x < allQuestions.length; x += 1) {
 		delete config[allQuestions[x].name];
 	}

install/package.json

@@ -29,13 +29,15 @@
         "cli-graph": "^3.2.2",
         "clipboard": "^2.0.1",
         "colors": "^1.1.2",
-        "compression": "^1.7.1",
         "commander": "^2.12.2",
+        "compression": "^1.7.1",
         "connect-ensure-login": "^0.1.1",
         "connect-flash": "^0.1.1",
         "connect-mongo": "2.0.1",
         "connect-multiparty": "^2.1.0",
+        "connect-pg-simple": "^4.2.1",
         "connect-redis": "3.3.3",
+        "continuation-local-storage": "^3.2.1",
         "cookie-parser": "^1.4.3",
         "cron": "^1.3.0",
         "cropperjs": "^1.2.2",
@@ -82,6 +84,8 @@
         "nodemailer": "^4.6.5",
         "passport": "^0.4.0",
         "passport-local": "1.0.0",
+        "pg": "^7.4.0",
+        "pg-cursor": "^1.3.0",
         "postcss": "7.0.2",
         "postcss-clean": "1.1.0",
         "promise-polyfill": "^8.0.0",
@@ -97,6 +101,7 @@
         "socket.io": "2.1.1",
         "socket.io-adapter-cluster": "^1.0.1",
         "socket.io-adapter-mongo": "^2.0.1",
+        "socket.io-adapter-postgres": "^1.0.1",
         "socket.io-client": "2.1.1",
         "socket.io-redis": "5.2.0",
         "socketio-wildcard": "2.0.0",

install/web.js

@@ -90,7 +90,7 @@ function ping(req, res) {
 }
 
 function welcome(req, res) {
-	var dbs = ['redis', 'mongo'];
+	var dbs = ['redis', 'mongo', 'postgres'];
 	var databases = dbs.map(function (databaseName) {
 		var questions = require('../src/database/' + databaseName).questions.filter(function (question) {
 			return question && !question.hideOnWebInstall;