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-rwxr-xr-xdevel/management/commands/reporead_inotify.py188
1 files changed, 188 insertions, 0 deletions
diff --git a/devel/management/commands/reporead_inotify.py b/devel/management/commands/reporead_inotify.py
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--- /dev/null
+++ b/devel/management/commands/reporead_inotify.py
@@ -0,0 +1,188 @@
+# -*- coding: utf-8 -*-
+"""
+reporead_inotify command
+
+Watches repo.files.tar.gz files for updates and parses them after a short delay
+in order to catch all updates in a single bulk update.
+
+Usage: ./manage.py reporead_inotify [path_template]
+
+Where 'path_template' is an optional path_template for finding the
+repo.files.tar.gz files. The form is '/srv/ftp/%(repo)s/os/%(arch)s/', which is
+also the default template if none is specified. While 'repo' is not required to
+be present in the path_template, note that 'arch' is so reporead can function
+correctly.
+"""
+
+import logging
+import os.path
+import pyinotify
+import sys
+import threading
+import time
+
+from django.core.management.base import BaseCommand, CommandError
+
+from main.models import Arch, Repo
+from .reporead import read_repo
+
+logging.basicConfig(
+ level=logging.WARNING,
+ format='%(asctime)s -> %(levelname)s: %(message)s',
+ datefmt='%Y-%m-%d %H:%M:%S',
+ stream=sys.stderr)
+logger = logging.getLogger()
+
+class Command(BaseCommand):
+ help = "Watch database files and run an update when necessary."
+ args = "[path_template]"
+
+ def handle(self, path_template=None, **options):
+ v = int(options.get('verbosity', 0))
+ if v == 0:
+ logger.level = logging.ERROR
+ elif v == 1:
+ logger.level = logging.INFO
+ elif v == 2:
+ logger.level = logging.DEBUG
+
+ if not path_template:
+ path_template = '/srv/ftp/%(repo)s/os/%(arch)s/'
+ self.path_template = path_template
+
+ notifier = self.setup_notifier()
+ logger.info('Entering notifier loop')
+ notifier.loop()
+
+ def setup_notifier(self):
+ '''Set up and configure the inotify machinery and logic.
+ This takes the provided or default path_template and builds a list of
+ directories we need to watch for database updates. It then validates
+ and passes these on to the various pyinotify pieces as necessary and
+ finally builds and returns a notifier object.'''
+ arches = Arch.objects.filter(agnostic=False)
+ repos = Repo.objects.all()
+ arch_path_map = dict((arch, None) for arch in arches)
+ all_paths = set()
+ total_paths = 0
+ for arch in arches:
+ combos = ({ 'repo': repo.name.lower(), 'arch': arch.name }
+ for repo in repos)
+ # take a python format string and generate all unique combinations
+ # of directories from it; using set() ensures we filter it down
+ paths = set(self.path_template % values for values in combos)
+ total_paths += len(paths)
+ all_paths |= paths
+ arch_path_map[arch] = paths
+
+ logger.info('Watching %d total paths', total_paths)
+ logger.debug(all_paths)
+
+ # sanity check- basically ensure every path we created from the
+ # template mapped to only one architecture
+ if total_paths != len(all_paths):
+ raise CommandError('path template did not uniquely '
+ 'determine architecture for each file')
+
+ # A proper atomic replacement of the database as done by rsync is type
+ # IN_MOVED_TO. repo-add/remove will finish with a IN_CLOSE_WRITE.
+ mask = pyinotify.IN_CLOSE_WRITE | pyinotify.IN_MOVED_TO
+
+ manager = pyinotify.WatchManager()
+ for name in all_paths:
+ manager.add_watch(name, mask)
+
+ handler = EventHandler(arch_paths=arch_path_map)
+ return pyinotify.Notifier(manager, handler)
+
+
+class Database(object):
+ '''A object representing a pacman database on the filesystem. It stores
+ various bits of metadata and state representing the file path, when we last
+ updated, how long our delay is before performing the update, whether we are
+ updating now, etc.'''
+ def __init__(self, arch, path, delay=60.0):
+ self.arch = arch
+ self.path = path
+ self.delay = delay
+ self.mtime = None
+ self.last_import = None
+ self.update_thread = None
+ self.updating = False
+ self.run_again = False
+ self.lock = threading.Lock()
+
+ def _start_update_countdown(self):
+ self.update_thread = threading.Timer(self.delay, self.update)
+ logger.info('Starting %.1f second countdown to update %s',
+ self.delay, self.path)
+ self.update_thread.start()
+
+ def queue_for_update(self, mtime):
+ logger.debug('Queueing database %s...', self.path)
+ with self.lock:
+ self.mtime = mtime
+ if self.updating:
+ # store the fact that we will need to run it again
+ self.run_again = True
+ return
+ if self.update_thread:
+ self.update_thread.cancel()
+ self._start_update_countdown()
+
+ def update(self):
+ logger.debug('Updating database %s...', self.path)
+ with self.lock:
+ self.last_import = time.time()
+ self.updating = True
+
+ try:
+ # invoke reporead's primary method
+ read_repo(self.arch, self.path, {})
+ finally:
+ logger.debug('Done updating database %s.', self.path)
+ with self.lock:
+ self.update_thread = None
+ self.updating = False
+ if self.run_again:
+ self.run_again = False
+ self._start_update_countdown()
+
+
+class EventHandler(pyinotify.ProcessEvent):
+ '''Our main event handler which listens for database change events. Because
+ we are watching the whole directory, we filter down and only look at those
+ events dealing with files databases.'''
+
+ def my_init(self, **kwargs):
+ self.databases = {}
+ self.arch_lookup = {}
+
+ # we really want a single path to arch mapping, so massage the data
+ arch_paths = kwargs['arch_paths']
+ for arch, paths in arch_paths.items():
+ self.arch_lookup.update((path.rstrip('/'), arch) for path in paths)
+
+ def process_default(self, event):
+ '''Primary event processing function which kicks off reporead timer
+ threads if a files database was updated.'''
+ if not event.name:
+ return
+ # screen to only the files we care about
+ if event.name.endswith('.files.tar.gz'):
+ path = event.pathname
+ stat = os.stat(path)
+ database = self.databases.get(path, None)
+ if database is None:
+ arch = self.arch_lookup.get(event.path, None)
+ if arch is None:
+ logger.warning(
+ 'Could not determine arch for %s, skipping update',
+ path)
+ return
+ database = Database(arch, path)
+ self.databases[path] = database
+ database.queue_for_update(stat.st_mtime)
+
+
+# vim: set ts=4 sw=4 et: