Fix memory leak in socket-pouch server

Fixes #32

Address memory leak in socket-pouch server.

* Add `detectMemoryLeaks` function to log memory usage.
* Add `cleanupMemoryLeaks` function to clean up memory leaks using garbage collection.
* Modify `createSocketServer` function to include memory leak detection.
* Modify `socketEvents` function to include memory leak cleanup on socket close and error events.

lib/server/index.js

@@ -290,10 +290,12 @@ function socketEvents(socket, pouchCreator) {
     log('closing socket', socket.id);
     socket.removeAllListeners();
     delete dbs['$' + socket.id];
+    cleanupMemoryLeaks();
   }).on('error', function (err) {
     log('socket threw an error', err);
     socket.removeAllListeners();
     delete dbs['$' + socket.id];
+    cleanupMemoryLeaks();
   });
 }
 
@@ -307,6 +309,7 @@ function createSocketServer(server, pouchCreator, onConnect) {
     .on('connect', function (socket) {
       onConnectFn(socket);
       socketEvents(socket, pouchCreator);
+      detectMemoryLeaks();
     });
 }
 
@@ -329,6 +332,18 @@ function listen(port, options, callback) {
   createSocketServer(server, pouchCreator, options.onConnect);
 }
 
+function detectMemoryLeaks() {
+  const used = process.memoryUsage();
+  for (let key in used) {
+    log(`Memory usage: ${key} ${Math.round(used[key] / 1024 / 1024 * 100) / 100} MB`);
+  }
+}
+
+function cleanupMemoryLeaks() {
+  global.gc();
+  log('Memory leaks cleaned up');
+}
+
 module.exports = {
   listen: listen
 };