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+# -*- coding: utf-8 -*-
+# incoming.py
+# Copyright (C) 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+Code to interact with Incoming Box feature.
+See: http://soledad.readthedocs.io/en/latest/incoming_box.html
+ or docs/incoming_box.rst
+"""
+import sys
+from twisted.logger import Logger
+from twisted.internet.task import LoopingCall
+from twisted.internet import defer
+log = Logger()
+
+
+class IncomingBoxProcessingLoop(object):
+ """
+ Implements the client-side processing flow for Incoming Box feature,
+ maintaining a loop that fetches incoming messages from remote replica,
+ delivers it to consumers and changes flags as necessary. This is defined at
+ "Processing Incoming Messages" section on Incoming Box Specifications:
+ http://soledad.readthedocs.io/en/latest/incoming_box.html
+ """
+
+ def __init__(self, incoming_box):
+ self.incoming_box = incoming_box
+ self.consumers = []
+ self._loop = LoopingCall(self._process)
+
+ def __call__(self):
+ return self._loop()
+
+ @property
+ def running(self):
+ return self._loop.running
+
+ def start(self, interval=30):
+ """
+ Starts the inner LoopingCall, triggering the loop.
+ :param interval: Time between interactions in seconds.
+ :type interval: int
+ """
+ return self._loop.start(interval)
+
+ def stop(self):
+ """
+ Stops the inner LoopingCall, stopping the loop.
+ """
+ return self._loop.stop()
+
+ def add_consumer(self, consumer):
+ """
+ Adds a consumer to the consumers list, so it can be used to process and
+ persist incoming box items.
+ :param consumer: Consumer implementation
+ :type consumer: leap.soledad.client.interfaces.IIncomingBoxConsumer
+ """
+ self.consumers.append(consumer)
+
+ @defer.inlineCallbacks
+ def _process(self):
+ pending = yield self.incoming_box.list_pending()
+ for item_id in pending:
+ item = yield self.incoming_box.fetch_for_processing(item_id)
+ if not item:
+ log.warn("Couldn't reserve item %s for processing, skipping.")
+ continue
+ failed = False
+ for consumer in self.consumers:
+ try:
+ parts = yield consumer.process(item, item_id=item_id)
+ except:
+ msg = "Consumer %s failed to process item %s: %s"
+ msg %= (consumer.name, item_id, sys.exc_info()[0])
+ log.error(msg)
+ failed = True
+ continue
+ yield self.incoming_box.set_processed(item_id)
+ try:
+ yield consumer.save(parts, item_id=item_id)
+ except:
+ msg = "Consumer %s failed to save item %s: %s"
+ msg %= (consumer.name, item_id, sys.exc_info()[0])
+ log.error(msg)
+ failed = True
+ if failed:
+ yield self.incoming_box.set_failed(item_id)
+ else:
+ yield self.incoming_box.delete(item_id)