- Implemented Kafka backend, as a variant of #6

- pusher changed to use either Pushbullet or Kafka as a backend
(whatever is specified with pusher=True in the main config file). Still
a lot of dirty code to refactor there tho.

runbullet/backend/__init__.py

@@ -53,6 +53,9 @@ class Backend(Thread):
 
         self.mq.put(msg)
 
+    def send_msg(self, msg):
+        raise NotImplementedError()
+
     def run(self):
         raise NotImplementedError()
 

runbullet/backend/kafka/__init__.py

@@ -0,0 +1,46 @@
+import logging
+import json
+
+from kafka import KafkaConsumer, KafkaProducer
+
+from .. import Backend
+
+class KafkaBackend(Backend):
+    def _init(self, server, topic):
+        self.server = server
+        self.topic = topic
+
+    def _on_record(self, record):
+        if record.topic != self.topic: return
+
+        try:
+            msg = json.loads(record.value.decode('utf-8'))
+        except Exception as e:
+            logging.exception(e)
+
+        logging.debug('Received message: {}'.format(msg))
+        self.on_msg(msg)
+
+    def _init_producer(self):
+        if not self.producer:
+            self.producer = KafkaProducer(bootstrap_servers=self.server)
+
+    def send_msg(self, msg):
+        if isinstance(msg, bytes):
+            msg = msg.encode('utf-8')
+        if isinstance(msg, str):
+            msg = json.dumps(msg)
+        if not isinstance(msg, dict):
+            raise RuntimeError('Invalid non-JSON message')
+
+        self._init_producer()
+        self.producer.send(self.topic, msg)
+
+    def run(self):
+        self.producer = None
+        self.consumer = KafkaConsumer(self.topic, bootstrap_servers=self.server)
+        for msg in self.consumer:
+            self._on_record(msg)
+
+# vim:sw=4:ts=4:et:
+

runbullet/backend/pushbullet/__init__.py

@@ -5,7 +5,7 @@ import websocket
 from .. import Backend
 
 class PushbulletBackend(Backend):
-    def _init(self, token, device=None):
+    def _init(self, token, device):
         self.token = token
         self.device = device
 
@@ -28,7 +28,11 @@ class PushbulletBackend(Backend):
         self._init_socket()
 
     def _on_push(self, data):
+        try:
             data = json.loads(data) if isinstance(data, str) else push
+        except Exception as e:
+            logging.exception(e)
+            return
 
         if data['type'] != 'push':
             return  # Not a push notification

runbullet/bin/pusher

@@ -9,6 +9,7 @@ import yaml
 
 from pushbullet import Pushbullet
 from runbullet import parse_config_file
+from runbullet.backend.kafka import KafkaBackend
 
 
 def print_usage():
@@ -19,22 +20,42 @@ def print_usage():
     payload:\t\tArguments to the action
 '''.format(sys.argv[0]))
 
-def main():
-    config = parse_config_file()
-    API_KEY = config['backend.pushbullet']['token']
-    pb = Pushbullet(API_KEY)
-
+def get_pb_device_by_name(pb, name):
     devices = [
-        _ for _ in pb.devices if _.nickname == config['backend.pushbullet']['device']
+        _ for _ in pb.devices if _.nickname == name
     ]
 
-    if len(devices) > 0:
-        device = devices[0]
-    else:
+    return devices[0] if devices else None
+
+def send_pb_message(pb, device_name, msg):
+    device = get_pb_device_by_name(pb, name=device_name)
+    if not device:
         print('Device {} not found - please create a virtual device on ' +
               'your PushBullet account'.format(config['backend.pushbullet']['device']))
         return
 
+    pb.push_note('', json.dumps(msg), device)
+
+def send_kafka_message(backend, msg):
+    backend.send_msg(msg)
+
+def get_backend(config):
+    # TODO Refactor this as something better and reuse the same
+    # backend classes from the runbullet consumer module
+    if 'backend.pushbullet' in config \
+            and 'pusher' in config['backend.pushbullet'] \
+            and config['backend.pushbullet']['pusher']:
+        API_KEY = config['backend.pushbullet']['token']
+        return Pushbullet(API_KEY)
+    elif 'backend.kafka' in config \
+            and 'pusher' in config['backend.kafka'] \
+            and config['backend.kafka']['pusher']:
+        c = config['backend.kafka']
+        return KafkaBackend(server=c['server'], topic=c['topic'])
+
+def main():
+    config = parse_config_file()
+
     parser = argparse.ArgumentParser()
     parser.add_argument('--target', '-t', dest='target', required=True,
                         help="Destination of the command")
@@ -59,7 +80,12 @@ def main():
     }
 
     print('msg: {}'.format(msg))
-    pb.push_note('', json.dumps(msg), device)
+
+    backend = get_backend(config)
+    if isinstance(backend, Pushbullet):
+        send_pb_message(backend, config['backend.pushbullet']['device'], msg)
+    elif isinstance(backend, Pushbullet):
+        send_kafka_message(backend, msg)
 
 
 if __name__ == '__main__':

runbullet/config.example.yaml

@@ -1,5 +1,12 @@
-backend.pushbullet:
+backend.kafka:
     disabled: False
+    pusher: True  # The pusher executable will use this backend by default
+    logging: DEBUG
+    server: your_server:9092
+    topic: runbullet
+
+backend.pushbullet:
+    disabled: True
     logging: DEBUG
     token: your_pushbullet_token_here
     device: turing