Mobile: add mutext to protect mc var

Author: kaloudis

mobile/mobile.go

@@ -94,6 +94,9 @@ var (
 	// mMutex should always be used to guard the m map
 	mMutex sync.RWMutex
 
+	// mcMutex should be used to guard the mc variable
+	mcMutex sync.RWMutex
+
 	registry = make(map[string]func(context.Context,
 		*grpc.ClientConn, string, func(string, error)))
 
@@ -174,16 +177,18 @@ func ConnectServer(nameSpace string, mailboxServer string, isDevServer bool,
 	}
 
 	mMutex.Lock()
-	defer mMutex.Unlock()
-
 	mc, ok := m[nameSpace]
+	mMutex.Unlock()
 	if !ok {
 		return fmt.Errorf("unknown namespace: %s", nameSpace)
 	}
 
 	// Since the connection function is blocking, we need to spin it off
 	// in another goroutine here. See https://pkg.go.dev/syscall/js#FuncOf.
 	go func() {
+		mcMutex.Lock()
+		defer mcMutex.Unlock()
+
 		statusChecker, lndConnect, err := core.MailboxRPCConnection(
 			mailboxServer, pairingPhrase, localPriv, remotePub,
 			func(key *btcec.PublicKey) error {