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supysonic/bin/supysonic-watcher

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#!/usr/bin/python
# coding: utf-8
# This file is part of Supysonic.
#
# Supysonic is a Python implementation of the Subsonic server API.
# Copyright (C) 2014 Alban 'spl0k' Féron
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import time, sys
import logging
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from threading import Thread, Condition, Timer
from logging.handlers import TimedRotatingFileHandler
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler
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from supysonic import config, db
from supysonic.scanner import Scanner
class SupysonicWatcherEventHandler(PatternMatchingEventHandler):
def __init__(self, queue, logger):
extensions = config.get('base', 'scanner_extensions')
patterns = map(lambda e: "*." + e.lower(), extensions.split()) if extensions else None
super(SupysonicWatcherEventHandler, self).__init__(patterns = patterns, ignore_directories = True)
self.__queue = queue
self.__logger = logger
def on_created(self, event):
self.__logger.debug("File created: '%s'", event.src_path)
self.__queue.put(event.src_path)
def on_deleted(self, event):
self.__logger.debug("File deleted: '%s'", event.src_path)
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store = db.get_store(config.get('base', 'database_uri'))
track = store.find(db.Track, db.Track.path == event.src_path).one()
if track:
scanner = Scanner(store)
scanner.remove_file(track.path)
scanner.finish()
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store.commit()
else:
self.__logger.debug("Deleted file %s not in the database", event.src_path)
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store.close()
def on_modified(self, event):
self.__logger.debug("File modified: '%s'", event.src_path)
self.__queue.put(event.src_path)
def on_moved(self, event):
pass
class ScannerProcessingQueue(Thread):
def __init__(self, logger):
super(ScannerProcessingQueue, self).__init__()
self.__logger = logger
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self.__cond = Condition()
self.__timer = None
self.__queue = {}
self.__running = True
def run(self):
while self.__running:
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time.sleep(0.1)
with self.__cond:
self.__cond.wait()
if not self.__queue:
continue
self.__logger.debug("Instantiating scanner")
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store = db.get_store(config.get('base', 'database_uri'))
scanner = Scanner(store)
path = self.__next_item()
while path:
self.__logger.info("Scanning: '%s'", path)
scanner.scan_file(path)
path = self.__next_item()
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store.commit()
store.close()
self.__logger.debug("Freeing scanner")
del scanner
def stop(self):
self.__running = False
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with self.__cond:
self.__cond.notify()
def put(self, path):
if not self.__running:
raise RuntimeError("Trying to put an item in a stopped queue")
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with self.__cond:
self.__queue[path] = time.time()
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if self.__timer:
self.__timer.cancel()
self.__timer = Timer(5, self.__wakeup)
self.__timer.start()
def __wakeup(self):
with self.__cond:
self.__cond.notify()
self.__timer = None
def __next_item(self):
with self.__cond:
if not self.__queue:
return None
next = sorted(self.__queue.iteritems(), key = lambda i: i[1])[0]
if not self.__running or next[1] + 5 < time.time():
del self.__queue[next[0]]
return next[0]
return None
if __name__ == "__main__":
if not config.check():
sys.exit(1)
logger = logging.getLogger(__name__)
if config.get('daemon', 'log_file'):
log_handler = TimedRotatingFileHandler(config.get('daemon', 'log_file'), when = 'midnight')
else:
log_handler = logging.NullHandler()
log_handler.setFormatter(logging.Formatter("%(asctime)s [%(levelname)s] %(message)s"))
logger.addHandler(log_handler)
if config.get('daemon', 'log_level'):
mapping = {
'DEBUG': logging.DEBUG,
'INFO': logging.INFO,
'WARNING': logging.WARNING,
'ERROR': logging.ERROR,
'CRTICAL': logging.CRITICAL
}
logger.setLevel(mapping.get(config.get('daemon', 'log_level').upper(), logging.NOTSET))
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store = db.get_store(config.get('base', 'database_uri'))
folders = store.find(db.Folder, db.Folder.root == True)
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if not folders.count():
logger.info("No folder set. Exiting.")
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store.close()
sys.exit(0)
queue = ScannerProcessingQueue(logger)
handler = SupysonicWatcherEventHandler(queue, logger)
observer = Observer()
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for folder in folders:
logger.info("Starting watcher for %s", folder.path)
observer.schedule(handler, folder.path, recursive = True)
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store.close()
queue.start()
observer.start()
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
logger.info("Stopping watcher")
observer.stop()
observer.join()
queue.stop()
queue.join()