fix: db info page

if there is no connection to db, connect first

src/database/mongo.js

@@ -201,11 +201,18 @@ mongoModule.checkCompatibilityVersion = function (version, callback) {
 };
 
 mongoModule.info = function (db, callback) {
-	if (!db) {
-		return callback();
-	}
 	async.waterfall([
 		function (next) {
+			if (db) {
+				return setImmediate(next, null, db);
+			}
+			mongoModule.connect(nconf.get('mongo'), function (err, client) {
+				next(err, client ? client.db() : undefined);
+			});
+		},
+		function (db, next) {
+			mongoModule.client = mongoModule.client || db;
+
 			async.parallel({
 				serverStatus: function (next) {
 					db.command({ serverStatus: 1 }, next);

src/database/postgres.js

@@ -450,19 +450,26 @@ postgresModule.checkCompatibilityVersion = function (version, callback) {
 };
 
 postgresModule.info = function (db, callback) {
-	if (!db) {
-		return callback();
+	async.waterfall([
+		function (next) {
+			if (db) {
+				setImmediate(next, null, db);
+			} else {
+				postgresModule.connect(nconf.get('postgres'), next);
 			}
+		},
+		function (db, next) {
+			postgresModule.pool = postgresModule.pool || db;
 
 			db.query(`
 			SELECT true "postgres",
 				   current_setting('server_version') "version",
-       EXTRACT(EPOCH FROM NOW() - pg_postmaster_start_time()) * 1000 "uptime"`, function (err, res) {
-		if (err) {
-			return callback(err);
-		}
-		callback(null, res.rows[0]);
-	});
+				   EXTRACT(EPOCH FROM NOW() - pg_postmaster_start_time()) * 1000 "uptime"`, next);
+		},
+		function (res, next) {
+			next(null, res.rows[0]);
+		},
+	], callback);
 };
 
 postgresModule.close = function (callback) {

src/database/redis.js

@@ -98,7 +98,7 @@ redisModule.connect = function (options, callback) {
 	cxn.on('ready', function () {
 		if (!callbackCalled) {
 			callbackCalled = true;
-			callback();
+			callback(null, cxn);
 		}
 	});
 
@@ -163,11 +163,16 @@ redisModule.close = function (callback) {
 };
 
 redisModule.info = function (cxn, callback) {
-	if (!cxn) {
-		return callback();
-	}
 	async.waterfall([
 		function (next) {
+			if (cxn) {
+				return setImmediate(next, null, cxn);
+			}
+			redisModule.connect(nconf.get('redis'), next);
+		},
+		function (cxn, next) {
+			redisModule.client = redisModule.client || cxn;
+
 			cxn.info(next);
 		},
 		function (data, next) {

test/database.js

@@ -22,10 +22,10 @@ describe('Test database', function () {
 			});
 		});
 
-		it('should not error and return null if client is falsy', function (done) {
+		it('should not error and return info if client is falsy', function (done) {
 			db.info(null, function (err, info) {
 				assert.ifError(err);
-				assert.equal(info, null);
+				assert(info);
 				done();
 			});
 		});