优化接入网关，解决协程泄漏的问题

server/utils/keyed_mutex.go

@@ -0,0 +1,15 @@
+package utils
+
+import "sync"
+
+type KeyedMutex struct {
+	mutexes sync.Map // Zero value is empty and ready for use
+}
+
+func (m *KeyedMutex) Lock(key string) func() {
+	value, _ := m.mutexes.LoadOrStore(key, &sync.Mutex{})
+	mtx := value.(*sync.Mutex)
+	mtx.Lock()
+
+	return func() { mtx.Unlock() }
+}