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Clean up code for sending federation EDUs. (#5381) 

This code confused the hell out of me today. Split _get_new_device_messages
into its two (unrelated) parts.
This commit is contained in:
Richard van der Hoff 2019-06-13 13:52:08 +01:00 committed by GitHub
parent 6312d6cc7c
commit 5c15039e06
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2 changed files with 27 additions and 14 deletions
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1
changelog.d/5381.misc Normal file
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@ -0,0 +1 @@
Clean up code for sending federation EDUs.

40
synapse/federation/sender/per_destination_queue.py
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@ -189,11 +189,21 @@ class PerDestinationQueue(object):
pending_pdus = []
while True:
device_message_edus, device_stream_id, dev_list_id = (
# We have to keep 2 free slots for presence and rr_edus
yield self._get_new_device_messages(MAX_EDUS_PER_TRANSACTION - 2)
# We have to keep 2 free slots for presence and rr_edus
limit = MAX_EDUS_PER_TRANSACTION - 2
device_update_edus, dev_list_id = (
yield self._get_device_update_edus(limit)
)
limit -= len(device_update_edus)
to_device_edus, device_stream_id = (
yield self._get_to_device_message_edus(limit)
)
pending_edus = device_update_edus + to_device_edus
# BEGIN CRITICAL SECTION
#
# In order to avoid a race condition, we need to make sure that
@ -208,10 +218,6 @@ class PerDestinationQueue(object):
# We can only include at most 50 PDUs per transactions
pending_pdus, self._pending_pdus = pending_pdus[:50], pending_pdus[50:]
pending_edus = []
# We can only include at most 100 EDUs per transactions
# rr_edus and pending_presence take at most one slot each
pending_edus.extend(self._get_rr_edus(force_flush=False))
pending_presence = self._pending_presence
self._pending_presence = {}
@ -232,7 +238,6 @@ class PerDestinationQueue(object):
)
)
pending_edus.extend(device_message_edus)
pending_edus.extend(
self._pop_pending_edus(MAX_EDUS_PER_TRANSACTION - len(pending_edus))
)
@ -272,10 +277,13 @@ class PerDestinationQueue(object):
sent_edus_by_type.labels(edu.edu_type).inc()
# Remove the acknowledged device messages from the database
# Only bother if we actually sent some device messages
if device_message_edus:
if to_device_edus:
yield self._store.delete_device_msgs_for_remote(
self._destination, device_stream_id
)
# also mark the device updates as sent
if device_update_edus:
logger.info(
"Marking as sent %r %r", self._destination, dev_list_id
)
@ -347,7 +355,7 @@ class PerDestinationQueue(object):
return pending_edus
@defer.inlineCallbacks
def _get_new_device_messages(self, limit):
def _get_device_update_edus(self, limit):
last_device_list = self._last_device_list_stream_id
# Retrieve list of new device updates to send to the destination
@ -366,15 +374,19 @@ class PerDestinationQueue(object):
assert len(edus) <= limit, "get_devices_by_remote returned too many EDUs"
defer.returnValue((edus, now_stream_id))
@defer.inlineCallbacks
def _get_to_device_message_edus(self, limit):
last_device_stream_id = self._last_device_stream_id
to_device_stream_id = self._store.get_to_device_stream_token()
contents, stream_id = yield self._store.get_new_device_msgs_for_remote(
self._destination,
last_device_stream_id,
to_device_stream_id,
limit - len(edus),
limit,
)
edus.extend(
edus = [
Edu(
origin=self._server_name,
destination=self._destination,
@ -382,6 +394,6 @@ class PerDestinationQueue(object):
content=content,
)
for content in contents
)
]
defer.returnValue((edus, stream_id, now_stream_id))
defer.returnValue((edus, stream_id))