Add method to get swarm participants for new leader, fix some comments

DecisionSystem/CentralisedDecision/commander.py

@@ -27,13 +27,13 @@ class Commander:
         # If using apache zookeeper this won't be needed.
 
     def make_decision(self):
-        # Should change this to be a strategy, for different implementations of making 
-        # a decision on the votes. 
+        # Should change this to follow strategy pattern, for different implementations of 
+        # making a decision on the votes. 
         votes = self._votes
         dif_votes = {}
 
         for vote in votes:
-            # Get the average/max, etc.
+            # Get the count of different votes. 
             if str(vote) in dif_votes:
                 dif_votes[str(vote)] = dif_votes[str(vote)] + 1
             else:
@@ -49,6 +49,7 @@ class Commander:
         return max_vote
 
     def get_votes(self):
+        # Should consider abstracting these messages to another class for portability.
         message = {"type": "reqVote"}
         message_packed = umsgpack.packb(message)
         self._taking_votes = True
@@ -72,7 +73,7 @@ class Commander:
                     # Commander must have requested their taking votes, and the timeout
                     # has not occurred. 
                     # Only add vote to list if the client has not already voted. 
-                    if messageDict["client"] not in self._votes.keys:
+                    if messageDict["client"] not in self._votes:
                         self._votes[messageDict["client"]] = messageDict["vote"]
 
             elif messageDict["type"] == "disconnected":
@@ -82,4 +83,8 @@ class Commander:
             pass
 
     def on_connect(self, client, userdata, flags, rc):
-        self.client.subscribe("swarm1/commander")
+        self.client.subscribe("swarm1/commander")
+
+    def get_participants(self):
+
+        self.client.publish("swarm1/voters")