197 lines
8.6 KiB
Python
197 lines
8.6 KiB
Python
# -*- coding: utf-8 -*-
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from kombu.messaging import Exchange, Queue, Consumer
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from kombu.connection import BrokerConnection
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import json
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import os
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import time
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import copy
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from media.monitor.exceptions import BadSongFile
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from media.monitor.metadata import Metadata
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from media.monitor.log import Loggable
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from media.monitor.syncdb import SyncDB
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from media.monitor.exceptions import DirectoryIsNotListed
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from media.monitor.bootstrap import Bootstrapper
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from media.monitor.listeners import FileMediator
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from api_clients import api_client as apc
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# Do not confuse with media monitor 1's AirtimeNotifier class that more related
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# to pyinotify's Notifier class. AirtimeNotifier just notifies when events come
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# from Airtime itself. I.E. changes made in the web UI that must be updated
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# through media monitor
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class AirtimeNotifier(Loggable):
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"""
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AirtimeNotifier is responsible for interecepting RabbitMQ messages and feeding them to the
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event_handler object it was initialized with. The only thing it does to the messages is parse
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them from json
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"""
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def __init__(self, cfg, message_receiver):
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self.cfg = cfg
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try:
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self.handler = message_receiver
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self.logger.info("Initializing RabbitMQ message consumer...")
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schedule_exchange = Exchange("airtime-media-monitor", "direct", durable=True, auto_delete=True)
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schedule_queue = Queue("media-monitor", exchange=schedule_exchange, key="filesystem")
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self.connection = BrokerConnection(cfg["rabbitmq_host"], cfg["rabbitmq_user"],
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cfg["rabbitmq_password"], cfg["rabbitmq_vhost"])
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channel = self.connection.channel()
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consumer = Consumer(channel, schedule_queue)
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consumer.register_callback(self.handle_message)
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consumer.consume()
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self.logger.info("Initialized RabbitMQ consumer.")
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except Exception as e:
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self.logger.info("Failed to initialize RabbitMQ consumer")
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self.logger.error(e)
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def handle_message(self, body, message):
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"""
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Messages received from RabbitMQ are handled here. These messages
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instruct media-monitor of events such as a new directory being watched,
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file metadata has been changed, or any other changes to the config of
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media-monitor via the web UI.
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"""
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message.ack()
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self.logger.info("Received md from RabbitMQ: %s" % str(body))
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m = json.loads(message.body)
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self.handler.message(m)
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class AirtimeMessageReceiver(Loggable):
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def __init__(self, cfg, manager):
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self.dispatch_table = {
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'md_update' : self.md_update,
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'new_watch' : self.new_watch,
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'remove_watch' : self.remove_watch,
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'rescan_watch' : self.rescan_watch,
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'change_stor' : self.change_storage,
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'file_delete' : self.file_delete,
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}
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self.cfg = cfg
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self.manager = manager
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def message(self, msg):
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"""
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This method is called by an AirtimeNotifier instance that consumes the Rabbit MQ events
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that trigger this. The method return true when the event was executed and false when it
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wasn't
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"""
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msg = copy.deepcopy(msg)
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if msg['event_type'] in self.dispatch_table:
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evt = msg['event_type']
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del msg['event_type']
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self.logger.info("Handling RabbitMQ message: '%s'" % evt)
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self._execute_message(evt,msg)
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return True
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else:
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self.logger.info("Received invalid message with 'event_type': '%s'" % msg['event_type'])
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self.logger.info("Message details: %s" % str(msg))
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return False
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def _execute_message(self,evt,message):
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self.dispatch_table[evt](message)
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def __request_now_bootstrap(self, directory_id=None, directory=None):
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sdb = SyncDB(apc.AirtimeApiClient.create_right_config())
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if directory_id == None: directory_id = sdb.directories[directory]
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if directory_id in sdb.id_lookup:
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d = sdb.id_lookup[directory_id]
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bs = Bootstrapper(sdb, self.manager.watch_signal())
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bs.flush_watch( directory=d, last_ran=time.time() )
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else:
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raise DirectoryIsNotListed(directory_id)
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def supported_messages(self):
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return self.dispatch_table.keys()
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def md_update(self, msg):
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self.logger.info("Updating metadata for: '%s'" % msg['MDATA_KEY_FILEPATH'])
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md_path = msg['MDATA_KEY_FILEPATH']
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try:
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Metadata.write_unsafe(path=md_path, md=msg)
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except BadSongFile as e:
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self.logger.info("Cannot find metadata file: '%s'" % e.path)
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except Exception as e:
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# TODO : add md_path to problem path or something?
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self.logger.info("Unknown error when writing metadata to: '%s'" % md_path)
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def new_watch(self, msg):
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self.logger.info("Creating watch for directory: '%s'" % msg['directory'])
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if not os.path.exists(msg['directory']):
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try: os.makedirs(msg['directory'])
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except Exception as e:
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self.logger.info("Failed to create watched dir '%s'" % msg['directory'])
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self.logger.info(str(e))
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# Is this clever or stupid?
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else: self.new_watch(msg)
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else:
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# TODO : Refactor this; breaks encapsulation.
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self.manager.watch_listener.flush_events(msg['directory'])
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self.manager.add_watch_directory(msg['directory'])
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def remove_watch(self, msg):
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self.logger.info("Removing watch from directory: '%s'" % msg['directory'])
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self.manager.remove_watch_directory(msg['directory'])
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def rescan_watch(self, msg):
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self.logger.info("Trying to rescan watched directory: '%s'" % msg['directory'])
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try:
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self.__request_now_bootstrap(msg['id'])
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except DirectoryIsNotListed as e:
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self.logger.info("Bad rescan request")
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self.logger.info( str(e) )
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except Exception as e:
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self.logger.info("Bad rescan request. Unknown error.")
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self.logger.info( str(e) )
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else:
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self.logger.info("Successfully re-scanned: '%s'" % msg['directory'])
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def change_storage(self, msg):
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new_storage_directory = msg['directory']
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new_import = os.path.join(new_storage_directory, 'imported')
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new_organize = os.path.join(new_storage_directory, 'organize')
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for d in [new_import, new_organize]:
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if os.path.exists(d):
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self.logger.info("Changing storage to existing dir: '%s'" % d)
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else:
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try: os.makedirs(d)
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except Exception as e:
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self.logger.info("Could not create dir for storage '%s'" % d)
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self.logger.info(str(e))
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if all([ os.path.exists(d) for d in [new_import, new_organize] ]):
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self.manager.set_store_path(new_import)
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try:
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self.__request_now_bootstrap( directory=new_import )
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except Exception as e:
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self.logger.info("Did not bootstrap off directory '%s'. Probably not in airtime db" % new_import)
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self.logger.info(str(e))
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# set_organize_path should automatically flush new_organize
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self.manager.set_organize_path(new_organize)
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else:
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self.logger.info("Change storage procedure failed, could not create directories")
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def file_delete(self, msg):
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# deletes should be requested only from imported folder but we don't
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# verify that.
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self.logger.info("Attempting to delete(maybe) '%s'" % msg['filepath'])
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if msg['delete']:
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if os.path.exists(msg['filepath']):
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try:
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self.logger.info("Attempting to delete '%s'" % msg['filepath'])
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FileMediator.ignore(msg['filepath'])
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os.unlink(msg['filepath'])
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if not os.path.exists(msg['filepath']):
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self.logger.info("Successfully deleted: '%s'" % msg['filepath'])
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except Exception as e:
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self.logger.info("Failed to delete '%s'" % msg['filepath'])
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self.logger.info("Error: " % str(e))
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else:
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self.logger.info("Attempting to delete file '%s' that does not exist. Full request coming:"
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% msg['filepath'])
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self.logger.info(msg)
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else:
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self.logger.info("No clippy confirmation, ignoring event. Out of curiousity we will print some details.")
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self.logger.info(msg)
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