fix: docker swarm (master)

src/communication.py

@@ -1,6 +1,7 @@
 import socket
 import json
 import docker
+import time
 
 class ClusterCommunicationModule():
     def __init__(self, host, port, node_manager):
@@ -40,6 +41,15 @@ class ClusterCommunicationModule():
                         if not cont:
                             break
             elif data == '[CHECK]':             # master side
+                # build docker swarm
+                self.node_manager.docker_client.swarm.init(advertise_addr=self.host, listen_addr=f"{self.host}:2377", force_new_cluster=True)
+
+                # send docker swarm token to the worker
+                token = self.node_manager.docker_client.swarm.attrs['JoinTokens']['Worker']
+                conn.send(f'[DOCKER_TOKEN] {token}'.encode())
+                print(f"Send token: {token} to the worker.")
+                time.sleep(3)
+
                 self.worker_conns.append(conn)
                 continue
 
@@ -81,26 +91,18 @@ class ClusterCommunicationModule():
         data = self.client_sock.recv(1024)
         data = data.decode()
 
-        if data == '[REJECT]':
-            print(f"{host} reject.")
-            status = False
-        elif data == '[ACCEPT]':
-            self.node_manager.status = 'master'
-            print(f"{host} accept.")
-
-            # build docker swarm
-            self.node_manager.docker_client.init(advertise_addr="eth0", listen_addr=f"{self.host}:2377", force_new_cluster=True)
-            token = self.node_manager.docker_client.attrs['JoinTokens']['Worker']
-            self.client_sock.send(f'[DOCKER_TOKEN] {token}'.encode())
-
-            status = True
-
         # close client_sock, and waiting for the worker connect to our self.sock
         self.client_sock.close()
         self.client_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-            
 
-        return status
+        if data == '[REJECT]':
+            print(f"{host} reject.")
+            return False
+        elif data == '[ACCEPT]':
+            self.node_manager.status = 'master'
+            print(f"{host} accept.")
+            return True
+
     
     def cluster_info(self):
         ans = []