CC-3346: Recorder: Merge recorder with pypo

- separated rabitMQ listener part out from pypoFetch and created
pypomessagehandler.py

python_apps/pypo/pypomessagehandler.py

@@ -0,0 +1,120 @@
+import logging
+import logging.config
+import sys
+from configobj import ConfigObj
+from threading import Thread
+import time
+# For RabbitMQ
+from kombu.connection import BrokerConnection
+from kombu.messaging import Exchange, Queue, Consumer, Producer
+from kombu.exceptions import MessageStateError
+from kombu.simple import SimpleQueue
+import json
+
+# configure logging
+logging.config.fileConfig("logging.cfg")
+
+# loading config file
+try:
+    config = ConfigObj('/etc/airtime/pypo.cfg')
+    LS_HOST = config['ls_host']
+    LS_PORT = config['ls_port']
+    POLL_INTERVAL = int(config['poll_interval'])
+
+except Exception, e:
+    logger = logging.getLogger('message_h')
+    logger.error('Error loading config file: %s', e)
+    sys.exit()
+
+class PypoMessageHandler(Thread):
+    def __init__(self, pq, rq):
+        Thread.__init__(self)
+        self.logger = logging.getLogger('message_h')
+        self.pypo_queue = pq
+        self.recorder_queue = rq
+        
+    def init_rabbit_mq(self):
+        self.logger.info("Initializing RabbitMQ stuff")
+        try:
+            schedule_exchange = Exchange("airtime-pypo", "direct", durable=True, auto_delete=True)
+            schedule_queue = Queue("pypo-fetch", exchange=schedule_exchange, key="foo")
+            connection = BrokerConnection(config["rabbitmq_host"], config["rabbitmq_user"], config["rabbitmq_password"], config["rabbitmq_vhost"])
+            channel = connection.channel()
+            self.simple_queue = SimpleQueue(channel, schedule_queue)
+        except Exception, e:
+            self.logger.error(e)
+            return False
+            
+        return True
+    
+    """
+    Handle a message from RabbitMQ, put it into our yucky global var.
+    Hopefully there is a better way to do this.
+    """
+    def handle_message(self, message):
+        try:        
+            self.logger.info("Received event from RabbitMQ: %s" % message)
+            
+            m =  json.loads(message)
+            command = m['event_type']
+            self.logger.info("Handling command: " + command)
+        
+            if command == 'update_schedule':
+                self.logger.info("Updating schdule...")
+                self.pypo_queue.put(message)
+            elif command == 'update_stream_setting':
+                self.logger.info("Updating stream setting...")
+                self.pypo_queue.put(message)
+            elif command == 'update_stream_format':
+                self.logger.info("Updating stream format...")
+                self.pypo_queue.put(message)
+            elif command == 'update_station_name':
+                self.logger.info("Updating station name...")
+                self.pypo_queue.put(message)
+            elif command == 'cancel_current_show':
+                self.logger.info("Cancel current show command received...")
+                self.pypo_queue.put(message)
+            elif command == 'update_recorder_schedule':
+                self.recorder_queue.put(message)
+            elif command == 'cancel_recording':
+                self.recorder_queue.put(message)
+        except Exception, e:
+            self.logger.error("Exception in handling RabbitMQ message: %s", e)
+
+    def main(self):
+        while not self.init_rabbit_mq():
+            self.logger.error("Error connecting to RabbitMQ Server. Trying again in few seconds")
+            time.sleep(5)
+
+        loops = 1
+        while True:
+            self.logger.info("Loop #%s", loops)
+            try:
+                message = self.simple_queue.get(block=True)
+                self.handle_message(message.payload)
+                # ACK the message to take it off the queue
+                message.ack()
+            except Exception, e:
+                """
+                sleep 5 seconds so that we don't spin inside this
+                while loop and eat all the CPU
+                """
+                time.sleep(5)
+                
+                """
+                There is a problem with the RabbitMq messenger service. Let's
+                log the error and get the schedule via HTTP polling
+                """
+                self.logger.error("Exception, %s", e)
+
+            loops += 1
+
+    """
+    Main loop of the thread:
+    Wait for schedule updates from RabbitMQ, but in case there arent any,
+    poll the server to get the upcoming schedule.
+    """
+    def run(self):
+        while True:
+            self.main()
+