diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 1ede117c79..9f9257029e 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -30,6 +30,7 @@ from synapse.api.constants import PresenceState
from synapse.storage.presence import UserPresenceState
from synapse.util.caches.descriptors import cachedInlineCallbacks
+from synapse.util.async import Linearizer
from synapse.util.logcontext import preserve_fn
from synapse.util.logutils import log_function
from synapse.util.metrics import Measure
@@ -187,6 +188,7 @@ class PresenceHandler(object):
# process_id to millisecond timestamp last updated.
self.external_process_to_current_syncs = {}
self.external_process_last_updated_ms = {}
+ self.external_sync_linearizer = Linearizer(name="external_sync_linearizer")
# Start a LoopingCall in 30s that fires every 5s.
# The initial delay is to allow disconnected clients a chance to
@@ -509,6 +511,70 @@ class PresenceHandler(object):
self.external_process_to_current_syncs[process_id] = syncing_user_ids
@defer.inlineCallbacks
+ def update_external_syncs_row(self, process_id, user_id, is_syncing):
+ """Update the syncing users for an external process as a delta.
+
+ Args:
+ process_id (str): An identifier for the process the users are
+ syncing against. This allows synapse to process updates
+ as user start and stop syncing against a given process.
+ user_id (str): The user who has started or stopped syncing
+ is_syncing (bool): Whether or not the user is now syncing
+ """
+ with (yield self.external_sync_linearizer.queue(process_id)):
+ prev_state = yield self.current_state_for_user(user_id)
+
+ process_presence = self.external_process_to_current_syncs.setdefault(
+ process_id, set()
+ )
+ time_now_ms = self.clock.time_msec()
+
+ updates = []
+ if is_syncing and user_id not in process_presence:
+ if prev_state.state == PresenceState.OFFLINE:
+ updates.append(prev_state.copy_and_replace(
+ state=PresenceState.ONLINE,
+ last_active_ts=time_now_ms,
+ last_user_sync_ts=time_now_ms,
+ ))
+ else:
+ updates.append(prev_state.copy_and_replace(
+ last_user_sync_ts=time_now_ms,
+ ))
+ process_presence.add(user_id)
+ elif user_id in process_presence:
+ updates.append(prev_state.copy_and_replace(
+ last_user_sync_ts=time_now_ms,
+ ))
+
+ if updates:
+ yield self._update_states(updates)
+
+ self.external_process_last_updated_ms[process_id] = self.clock.time_msec()
+
+ @defer.inlineCallbacks
+ def update_external_syncs_clear(self, process_id):
+ """Marks all users that had been marked as syncing by a given process
+ as offline.
+
+ Used when the process has stopped/disappeared.
+ """
+ with (yield self.external_sync_linearizer.queue(process_id)):
+ process_presence = self.external_process_to_current_syncs.pop(
+ process_id, set()
+ )
+ prev_states = yield self.current_state_for_users(process_presence)
+ time_now_ms = self.clock.time_msec()
+
+ yield self._update_states([
+ prev_state.copy_and_replace(
+ last_user_sync_ts=time_now_ms,
+ )
+ for prev_state in prev_states.itervalues()
+ ])
+ self.external_process_last_updated_ms.pop(process_id, None)
+
+ @defer.inlineCallbacks
def current_state_for_user(self, user_id):
"""Get the current presence state for a user.
"""
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