134 lines
3.7 KiB
Python
134 lines
3.7 KiB
Python
import paho.mqtt.client as mqtt
|
|
import json
|
|
import random
|
|
|
|
class Messenger:
|
|
_connect_callbacks = []
|
|
_disconnect_callbacks = []
|
|
_message_callbacks = []
|
|
|
|
def broadcast_message(self, message):
|
|
"""
|
|
Broadcasts the specified message to the swarm based upon its topic(or group).
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def unicast_message(self, target, message):
|
|
"""
|
|
Broadcasts the specified message to the single target.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def connect(self):
|
|
"""
|
|
Connect to the swarm.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def disconnect(self):
|
|
"""
|
|
Disconnect from the swarm.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def add_connect(self, connect):
|
|
"""
|
|
Adds a callback to do something else once we are connected.
|
|
"""
|
|
self._connect_callbacks.append(connect)
|
|
|
|
def on_connect(self, code = None):
|
|
"""
|
|
Called once the messenger connects to the swarm.
|
|
"""
|
|
for cb in self._connect_callbacks:
|
|
cb(code)
|
|
|
|
def on_disconnect(self, code = None):
|
|
"""
|
|
Called when the messenger is disconnected from the swarm.
|
|
"""
|
|
for cb in self._disconnect_callbacks:
|
|
cb(code)
|
|
|
|
def add_disconnect_callback(self, on_disconnect):
|
|
"""
|
|
Adds a callback for when the messenger is disconnected.
|
|
"""
|
|
self._disconnect_callbacks.append(on_disconnect)
|
|
|
|
def add_message_callback(self, on_message):
|
|
"""
|
|
Adds a callback
|
|
"""
|
|
self._message_callbacks.append(on_message)
|
|
|
|
def on_message(self, message):
|
|
"""
|
|
Called when the messenger receives a message.
|
|
"""
|
|
for cb in self._message_callbacks:
|
|
cb(message)
|
|
|
|
@property
|
|
def id(self):
|
|
"""
|
|
The id for this messenger that is being used in communication.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
@property
|
|
def swarm(self):
|
|
"""
|
|
Gets the name of the swarm this instance is a part of.
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
|
|
class MqttMessenger(Messenger):
|
|
"""A messenger that uses MQTT."""
|
|
def __init__(self):
|
|
with open('config.json') as json_config:
|
|
self._cfg = json.load(json_config)
|
|
self._client = mqtt.Client(client_id=str(random.randint(0,500)))
|
|
self._client.on_connect = self.on_connect
|
|
self._client.on_message = self.on_message
|
|
self._client.on_disconnect = self.on_disconnect
|
|
|
|
def on_message(self, client, userdata, message):
|
|
Messenger.on_message(self, message)
|
|
|
|
def on_connect(self, client, userdata, flags, rc):
|
|
# Subscribe to the swarm specified in the config.
|
|
self._client.subscribe(self._cfg['mqtt']['swarm'])
|
|
|
|
# Also subscribe to our own topic for unicast messages.
|
|
self._client.subscribe(self._cfg['mqtt']['swarm'] + str(self._client._client_id))
|
|
Messenger.on_connect(self, rc)
|
|
|
|
def on_disconnect(self, client, userdata, rc):
|
|
Messenger.on_disconnect(self, rc)
|
|
|
|
def broadcast_message(self, message):
|
|
self._client.publish(self._cfg['mqtt']['swarm'], message, qos=1)
|
|
|
|
def unicast_message(self, target, message):
|
|
self._client.publish(target, message, qos=1)
|
|
|
|
def connect(self):
|
|
self._client.connect(self._cfg['mqtt']['host'], \
|
|
int(self._cfg['mqtt']['port']), \
|
|
int(self._cfg['mqtt']['timeout']))
|
|
|
|
self._client.loop_start()
|
|
|
|
def disconnec(self):
|
|
self._client.disconnect()
|
|
|
|
@property
|
|
def id(self):
|
|
return self._client._client_id
|
|
|
|
@property
|
|
def swarm(self):
|
|
return self._cfg['mqtt']['swarm'] |