Fix socket count metric leak

package.json

@@ -2,7 +2,7 @@
   "author": "Calvin Montgomery",
   "name": "CyTube",
   "description": "Online media synchronizer and chat",
-  "version": "3.56.2",
+  "version": "3.56.3",
   "repository": {
     "url": "http://github.com/calzoneman/sync"
   },

src/io/ioserver.js

@@ -218,18 +218,13 @@ class IOServer {
         Promise.all(promises).then(() => next());
     }
 
-    metricsEmittingMiddleware(socket, next) {
-        emitMetrics(socket);
-        next();
-    }
-
     handleConnection(socket) {
-        // TODO: move out of handleConnection if possible
-        // see: https://github.com/calzoneman/sync/issues/724
         if (!this.checkIPLimit(socket)) {
             return;
         }
 
+        emitMetrics(socket);
+
         LOGGER.info('Accepted socket from %s', socket.context.ipAddress);
         counters.add('socket.io:accept', 1);
         socket.once('disconnect', () => counters.add('socket.io:disconnect', 1));
@@ -257,7 +252,6 @@ class IOServer {
         io.use(this.cookieParsingMiddleware.bind(this));
         io.use(this.ipSessionCookieMiddleware.bind(this));
         io.use(this.authUserMiddleware.bind(this));
-        io.use(this.metricsEmittingMiddleware.bind(this));
         io.on('connection', this.handleConnection.bind(this));
     }
 

test/io/ioserver.js

@@ -69,57 +69,6 @@ describe('IOServer', () => {
         });
     });
 
-    /*
-    describe('#ipConnectionLimitMiddleware', () => {
-        beforeEach(() => {
-            socket.once = (event, callback) => {
-                socket[`on_${event}`] = callback;
-            };
-        });
-
-        it('allows IPs before the limit', done => {
-            server.ipConnectionLimitMiddleware(socket, error => {
-                if (error) {
-                    throw error;
-                }
-
-                done();
-            });
-        });
-
-        it('rejects IPs at the limit', done => {
-            server.ipCount.set(socket.context.ipAddress,
-                    require('../../lib/config').get('io.ip-connection-limit'));
-            server.ipConnectionLimitMiddleware(socket, error => {
-                assert(error, 'Expected an error to be returned');
-                assert.strictEqual(error.message,
-                        'Too many connections from your IP address');
-                done();
-            });
-        });
-
-        it('manages the ipCount map correctly', done => {
-            const ip = socket.context.ipAddress;
-
-            assert(!server.ipCount.has(ip), 'Test precondition failed: ipCount.has(ip)');
-
-            server.ipConnectionLimitMiddleware(socket, error => {
-                if (error) {
-                    throw error;
-                }
-
-                assert.strictEqual(server.ipCount.get(ip), 1);
-
-                socket.on_disconnect();
-
-                assert.strictEqual(server.ipCount.get(ip), 0);
-
-                done();
-            });
-        });
-    });
-    */
-
     describe('#cookieParsingMiddleware', () => {
         it('parses cookies', done => {
             socket.handshake.headers.cookie = 'flavor=chocolate%20chip';