CC-2588 :Use RabbitMQ to control the show recorder

- done
This commit is contained in:
James 2011-07-25 16:24:00 -04:00
parent 047a288c38
commit 2b36e8193e
4 changed files with 150 additions and 210 deletions

View File

@ -80,7 +80,16 @@ class RabbitMq
$EXCHANGE = 'airtime-show-recorder';
$channel->exchange_declare($EXCHANGE, 'direct', false, true);
$msg = new AMQPMessage($event_type, array('content_type' => 'text/plain'));
$today_timestamp = date("Y-m-d H:i:s");
$now = new DateTime($today_timestamp);
$end_timestamp = $now->add(new DateInterval("PT2H"));
$end_timestamp = $end_timestamp->format("Y-m-d H:i:s");
$temp['event_type'] = $event_type;
if($event_type = "update_schedule"){
$temp['shows'] = Show::getShows($today_timestamp, $end_timestamp, $excludeInstance=NULL, $onlyRecord=TRUE);
}
$data = json_encode($temp);
$msg = new AMQPMessage($data, array('content_type' => 'text/plain'));
$channel->basic_publish($msg, $EXCHANGE);
$channel->close();

View File

@ -1611,10 +1611,17 @@ class ShowInstance {
public function deleteShow()
{
// see if it was recording show
$recording = CcShowInstancesQuery::create()
->findPK($this->_instanceId)
->getDbRecord();
CcShowInstancesQuery::create()
->findPK($this->_instanceId)
->delete();
RabbitMq::PushSchedule();
if($recording){
RabbitMq::SendMessageToShowRecorder("cancel_recording");
}
}
public function setRecordedFile($file_id)

View File

@ -1,144 +0,0 @@
#!/usr/local/bin/python
import urllib
import logging
import logging.config
import json
import time
import datetime
import os
import sys
import shutil
from configobj import ConfigObj
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers
import urllib2
from subprocess import Popen
from threading import Thread
import mutagen
from api_clients import api_client
# For RabbitMQ - to be implemented in the future
from kombu.connection import BrokerConnection
from kombu.messaging import Exchange, Queue, Consumer, Producer
# configure logging
try:
logging.config.fileConfig("logging.cfg")
except Exception, e:
print 'Error configuring logging: ', e
sys.exit()
POLL_INTERVAL=3600
# loading config file
try:
config = ConfigObj('/etc/airtime/recorder.cfg')
except Exception, e:
logger = logging.getLogger('root')
logger.error('Error loading config file: %s', e)
sys.exit()
def getDateTimeObj(time):
timeinfo = time.split(" ")
date = timeinfo[0].split("-")
time = timeinfo[1].split(":")
return datetime.datetime(int(date[0]), int(date[1]), int(date[2]), int(time[0]), int(time[1]), int(time[2]))
class CommandHandler(Thread):
def __init__(self, command, q):
Thread.__init__(self)
self.api_client = api_client.api_client_factory(config)
self.logger = logging.getLogger('root')
self.logger.info("Handling command: " + command)
self.command = command
self.queue = q
def run(self):
if(self.command == 'update_schedule'):
self.queue.put(self.api_client.get_shows_to_record())
class CommandListener(Thread):
def __init__(self, q):
Thread.__init__(self)
self.api_client = api_client.api_client_factory(config)
self.logger = logging.getLogger('root')
self.sr = None
self.queue = q
self.shows_to_record = []
self.logger.info("RecorderFetch: init complete")
def init_rabbit_mq(self):
self.logger.info("Initializing RabbitMQ stuff")
try:
schedule_exchange = Exchange("airtime-show-recorder", "direct", durable=True, auto_delete=True)
schedule_queue = Queue("recorder-fetch", exchange=schedule_exchange, key="foo")
self.connection = BrokerConnection(config["rabbitmq_host"], config["rabbitmq_user"], config["rabbitmq_password"], "/")
channel = self.connection.channel()
consumer = Consumer(channel, schedule_queue)
consumer.register_callback(self.handle_message)
consumer.consume()
except Exception, e:
self.logger.error(e)
return False
return True
def handle_message(self, body, message):
self.logger.info("Received command from RabbitMQ: " + message.body)
ch = CommandHandler(message.body, self.queue)
ch.start()
# ACK the message to take it off the queue
message.ack()
"""def process_shows(self, shows):
self.logger.info("Processing shows...")
self.shows_to_record = []
self.logger.info(shows)
shows = shows[u'shows']
for show in shows:
show_starts = getDateTimeObj(show[u'starts'])
show_end = getDateTimeObj(show[u'ends'])
time_delta = show_end - show_starts
self.shows_to_record[show[u'starts']] = [time_delta, show[u'instance_id'], show[u'name']]"""
"""
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):
self.logger.info("Started...")
while not self.init_rabbit_mq():
self.logger.error("Error connecting to RabbitMQ Server. Trying again in few seconds")
time.sleep(5)
# Bootstrap: since we are just starting up, we need to grab the
# most recent schedule. After that we can just wait for updates.
try:
self.queue.put(self.api_client.get_shows_to_record())
self.logger.info("Bootstrap complete: got initial copy of the schedule")
except Exception, e:
self.logger.error(e)
loops = 1
while True:
self.logger.info("Loop #%s", loops)
try:
# Wait for messages from RabbitMQ. Timeout if we
# dont get any after POLL_INTERVAL.
self.connection.drain_events(timeout=POLL_INTERVAL)
status = 1
except Exception, e:
self.logger.info(e)
# We didnt get a message for a while, so poll the server
# to get an updated schedule.
self.queue.put(self.api_client.get_shows_to_record())
loops += 1

View File

@ -8,9 +8,6 @@ import datetime
import os
import sys
import shutil
from Queue import Queue
from commandlistener import CommandListener
from configobj import ConfigObj
@ -25,6 +22,10 @@ import mutagen
from api_clients import api_client
# For RabbitMQ
from kombu.connection import BrokerConnection
from kombu.messaging import Exchange, Queue, Consumer, Producer
# configure logging
try:
logging.config.fileConfig("logging.cfg")
@ -79,9 +80,12 @@ class ShowRecorder(Thread):
#blocks at the following line until the child process
#quits
code = self.p.wait()
self.logger.info("finishing record, return code %s", self.p.returncode)
code = self.p.returncode
self.p = None
self.logger.info("finishing record, return code %s", code)
return code, filepath
def cancel_recording(self):
@ -89,14 +93,13 @@ class ShowRecorder(Thread):
#for this is because it appears that ecasound starts 1 second later than
#it should, and therefore this method is sometimes incorrectly called 1
#second before the show ends.
time.sleep(3)
#time.sleep(3)
#send signal interrupt (2)
self.logger.info("Show manually cancelled!")
if (self.p is not None):
self.p.terminate()
self.p = None
self.p.kill()
#if self.p is defined, then the child process ecasound is recording
def is_recording(self):
return (self.p is not None)
@ -146,86 +149,151 @@ class ShowRecorder(Thread):
self.set_metadata_and_save(filepath)
self.upload_file(filepath)
os.remove(filepath)
except Exceptio, e:
self.logger.error(e)
else:
self.logger.info("problem recording show")
class RecordScheduler(Thread):
def __init__(self, q):
os.remove(filepath)
class CommandListener(Thread):
def __init__(self):
Thread.__init__(self)
self.queue = q
self.shows_to_record = {}
self.api_client = api_client.api_client_factory(config)
self.logger = logging.getLogger('root')
self.sr = None
self.current_schedule = {}
self.shows_to_record = []
self.time_till_next_show = 3600
self.logger.info("RecorderFetch: init complete")
def init_rabbit_mq(self):
self.logger.info("Initializing RabbitMQ stuff")
try:
schedule_exchange = Exchange("airtime-show-recorder", "direct", durable=True, auto_delete=True)
schedule_queue = Queue("recorder-fetch", exchange=schedule_exchange, key="foo")
self.connection = BrokerConnection(config["rabbitmq_host"], config["rabbitmq_user"], config["rabbitmq_password"], "/")
channel = self.connection.channel()
consumer = Consumer(channel, schedule_queue)
consumer.register_callback(self.handle_message)
consumer.consume()
except Exception, e:
self.logger.error(e)
return False
return True
def process_shows(self, shows):
self.logger.info("Processing show schedules...")
def handle_message(self, body, message):
# ACK the message to take it off the queue
message.ack()
self.logger.info("Received command from RabbitMQ: " + message.body)
m = json.loads(message.body)
command = m['event_type']
self.logger.info("Handling command: " + command)
if(command == 'update_schedule'):
temp = m['shows']
if temp is not None:
self.parse_shows(temp)
elif(command == 'cancel_recording'):
if self.sr.is_recording():
self.sr.cancel_recording()
def parse_shows(self, shows):
self.logger.info("Parsing show schedules...")
self.shows_to_record = {}
temp = shows[u'shows']
for show in temp:
for show in shows:
show_starts = getDateTimeObj(show[u'starts'])
show_end = getDateTimeObj(show[u'ends'])
time_delta = show_end - show_starts
self.shows_to_record[show[u'starts']] = [time_delta, show[u'instance_id'], show[u'name']]
delta = self.get_time_till_next_show()
# awake at least 5 seconds prior to the show start
self.time_till_next_show = delta - 5
self.logger.info(self.shows_to_record)
def get_time_till_next_show(self):
if len(self.shows_to_record) != 0:
tnow = datetime.datetime.now()
sorted_show_keys = sorted(self.shows_to_record.keys())
start_time = sorted_show_keys[0]
next_show = getDateTimeObj(start_time)
delta = next_show - tnow
out = delta.seconds
self.logger.debug("Next show %s", next_show)
self.logger.debug("Now %s", tnow)
else:
out = 3600
return out
def check_record(self):
def start_record(self):
if len(self.shows_to_record) != 0:
try:
tnow = datetime.datetime.now()
sorted_show_keys = sorted(self.shows_to_record.keys())
start_time = sorted_show_keys[0]
next_show = getDateTimeObj(start_time)
self.logger.debug("Next show %s", next_show)
self.logger.debug("Now %s", tnow)
delta = next_show - tnow
min_delta = datetime.timedelta(seconds=5)
if delta <= min_delta:
self.logger.debug("sleeping %s seconds until show", delta.seconds)
time.sleep(delta.seconds)
show_length = self.shows_to_record[start_time][0]
show_instance = self.shows_to_record[start_time][1]
show_name = self.shows_to_record[start_time][2]
self.sr = ShowRecorder(show_instance, show_name, show_length.seconds, start_time, filetype="mp3")
self.sr.start()
#remove show from shows to record.
del self.shows_to_record[start_time]
delta = self.get_time_till_next_show()
self.logger.debug("sleeping %s seconds until show", delta)
time.sleep(delta)
sorted_show_keys = sorted(self.shows_to_record.keys())
start_time = sorted_show_keys[0]
show_length = self.shows_to_record[start_time][0]
show_instance = self.shows_to_record[start_time][1]
show_name = self.shows_to_record[start_time][2]
self.sr = ShowRecorder(show_instance, show_name, show_length.seconds, start_time, filetype="mp3")
self.sr.start()
#remove show from shows to record.
del self.shows_to_record[start_time]
self.time_till_next_show = 3600
except Exception,e :
self.logger.error(e)
else:
self.logger.info("No recording schedule...")
self.logger.debug("No recording scheduled...")
"""
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):
self.logger.info("RecordScheduler started...")
while True:
if not self.queue.empty():
try:
self.logger.debug("Received data from command handler")
shows = self.queue.get()
self.logger.debug('shows %s' % shows)
self.process_shows(shows)
except Exception, e:
self.logger.error(e)
self.check_record()
time.sleep(1)
self.logger.info("Started...")
while not self.init_rabbit_mq():
self.logger.error("Error connecting to RabbitMQ Server. Trying again in few seconds")
time.sleep(5)
# Bootstrap: since we are just starting up, we need to grab the
# most recent schedule. After that we can just wait for updates.
try:
temp = self.api_client.get_shows_to_record()
if temp is not None:
shows = temp['shows']
self.parse_shows(shows)
self.logger.info("Bootstrap complete: got initial copy of the schedule")
except Exception, e:
self.logger.error(e)
loops = 1
while True:
self.logger.info("Loop #%s", loops)
try:
# block until 5 seconds before the next show start
self.connection.drain_events(timeout=self.time_till_next_show)
except Exception, e:
self.logger.info(e)
# start recording
self.start_record()
loops += 1
if __name__ == '__main__':
q = Queue()
cl = CommandListener(q)
cl = CommandListener()
cl.start()
rs = RecordScheduler(q)
rs.start()