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Move get_state methods into FederationHandler (#6503)

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This is a non-functional refactor as a precursor to some other work.
This commit is contained in:
Richard van der Hoff 2019-12-10 17:42:46 +00:00 committed by Richard van der Hoff
parent 4c7b1bb6cc
commit be294d6fde
3 changed files with 107 additions and 86 deletions
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1
changelog.d/6503.misc Normal file
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@ -0,0 +1 @@
Move get_state methods into FederationHandler.

91
synapse/federation/federation_client.py
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@ -37,9 +37,9 @@ from synapse.api.room_versions import (
)
from synapse.events import builder, room_version_to_event_format
from synapse.federation.federation_base import FederationBase, event_from_pdu_json
from synapse.logging.context import make_deferred_yieldable, run_in_background
from synapse.logging.context import make_deferred_yieldable
from synapse.logging.utils import log_function
from synapse.util import batch_iter, unwrapFirstError
from synapse.util import unwrapFirstError
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.retryutils import NotRetryingDestination
@ -308,19 +308,12 @@ class FederationClient(FederationBase):
return signed_pdu
@defer.inlineCallbacks
@log_function
def get_state_for_room(self, destination, room_id, event_id):
"""Requests all of the room state at a given event from a remote homeserver.
Args:
destination (str): The remote homeserver to query for the state.
room_id (str): The id of the room we're interested in.
event_id (str): The id of the event we want the state at.
def get_room_state_ids(self, destination: str, room_id: str, event_id: str):
"""Calls the /state_ids endpoint to fetch the state at a particular point
in the room, and the auth events for the given event
Returns:
Deferred[Tuple[List[EventBase], List[EventBase]]]:
A list of events in the state, and a list of events in the auth chain
for the given event.
Tuple[List[str], List[str]]: a tuple of (state event_ids, auth event_ids)
"""
result = yield self.transport_layer.get_room_state_ids(
destination, room_id, event_id=event_id
@ -329,74 +322,12 @@ class FederationClient(FederationBase):
state_event_ids = result["pdu_ids"]
auth_event_ids = result.get("auth_chain_ids", [])
desired_events = set(state_event_ids + auth_event_ids)
event_map = yield self.get_events_from_store_or_dest(
destination, room_id, desired_events
)
if not isinstance(state_event_ids, list) or not isinstance(
auth_event_ids, list
):
raise Exception("invalid response from /state_ids")
failed_to_fetch = desired_events - event_map.keys()
if failed_to_fetch:
logger.warning(
"Failed to fetch missing state/auth events for %s: %s",
room_id,
failed_to_fetch,
)
pdus = [event_map[e_id] for e_id in state_event_ids if e_id in event_map]
auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
auth_chain.sort(key=lambda e: e.depth)
return pdus, auth_chain
@defer.inlineCallbacks
def get_events_from_store_or_dest(self, destination, room_id, event_ids):
"""Fetch events from a remote destination, checking if we already have them.
Args:
destination (str)
room_id (str)
event_ids (Iterable[str])
Returns:
Deferred[dict[str, EventBase]]: A deferred resolving to a map
from event_id to event
"""
fetched_events = yield self.store.get_events(event_ids, allow_rejected=True)
missing_events = set(event_ids) - fetched_events.keys()
if not missing_events:
return fetched_events
logger.debug(
"Fetching unknown state/auth events %s for room %s",
missing_events,
event_ids,
)
room_version = yield self.store.get_room_version(room_id)
# XXX 20 requests at once? really?
for batch in batch_iter(missing_events, 20):
deferreds = [
run_in_background(
self.get_pdu,
destinations=[destination],
event_id=e_id,
room_version=room_version,
)
for e_id in batch
]
res = yield make_deferred_yieldable(
defer.DeferredList(deferreds, consumeErrors=True)
)
for success, result in res:
if success and result:
fetched_events[result.event_id] = result
return fetched_events
return state_event_ids, auth_event_ids
@defer.inlineCallbacks
@log_function

101
synapse/handlers/federation.py
View File

@ -64,7 +64,7 @@ from synapse.replication.http.federation import (
from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet
from synapse.state import StateResolutionStore, resolve_events_with_store
from synapse.types import UserID, get_domain_from_id
from synapse.util import unwrapFirstError
from synapse.util import batch_iter, unwrapFirstError
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room
from synapse.util.retryutils import NotRetryingDestination
@ -379,11 +379,9 @@ class FederationHandler(BaseHandler):
(
remote_state,
got_auth_chain,
) = yield self.federation_client.get_state_for_room(
origin, room_id, p
)
) = yield self._get_state_for_room(origin, room_id, p)
# we want the state *after* p; get_state_for_room returns the
# we want the state *after* p; _get_state_for_room returns the
# state *before* p.
remote_event = yield self.federation_client.get_pdu(
[origin], p, room_version, outlier=True
@ -583,6 +581,97 @@ class FederationHandler(BaseHandler):
else:
raise
@defer.inlineCallbacks
@log_function
def _get_state_for_room(self, destination, room_id, event_id):
"""Requests all of the room state at a given event from a remote homeserver.
Args:
destination (str): The remote homeserver to query for the state.
room_id (str): The id of the room we're interested in.
event_id (str): The id of the event we want the state at.
Returns:
Deferred[Tuple[List[EventBase], List[EventBase]]]:
A list of events in the state, and a list of events in the auth chain
for the given event.
"""
(
state_event_ids,
auth_event_ids,
) = yield self.federation_client.get_room_state_ids(
destination, room_id, event_id=event_id
)
desired_events = set(state_event_ids + auth_event_ids)
event_map = yield self._get_events_from_store_or_dest(
destination, room_id, desired_events
)
failed_to_fetch = desired_events - event_map.keys()
if failed_to_fetch:
logger.warning(
"Failed to fetch missing state/auth events for %s: %s",
room_id,
failed_to_fetch,
)
pdus = [event_map[e_id] for e_id in state_event_ids if e_id in event_map]
auth_chain = [event_map[e_id] for e_id in auth_event_ids if e_id in event_map]
auth_chain.sort(key=lambda e: e.depth)
return pdus, auth_chain
@defer.inlineCallbacks
def _get_events_from_store_or_dest(self, destination, room_id, event_ids):
"""Fetch events from a remote destination, checking if we already have them.
Args:
destination (str)
room_id (str)
event_ids (Iterable[str])
Returns:
Deferred[dict[str, EventBase]]: A deferred resolving to a map
from event_id to event
"""
fetched_events = yield self.store.get_events(event_ids, allow_rejected=True)
missing_events = set(event_ids) - fetched_events.keys()
if not missing_events:
return fetched_events
logger.debug(
"Fetching unknown state/auth events %s for room %s",
missing_events,
event_ids,
)
room_version = yield self.store.get_room_version(room_id)
# XXX 20 requests at once? really?
for batch in batch_iter(missing_events, 20):
deferreds = [
run_in_background(
self.federation_client.get_pdu,
destinations=[destination],
event_id=e_id,
room_version=room_version,
)
for e_id in batch
]
res = yield make_deferred_yieldable(
defer.DeferredList(deferreds, consumeErrors=True)
)
for success, result in res:
if success and result:
fetched_events[result.event_id] = result
return fetched_events
@defer.inlineCallbacks
def _process_received_pdu(self, origin, event, state, auth_chain):
""" Called when we have a new pdu. We need to do auth checks and put it
@ -723,7 +812,7 @@ class FederationHandler(BaseHandler):
state_events = {}
events_to_state = {}
for e_id in edges:
state, auth = yield self.federation_client.get_state_for_room(
state, auth = yield self._get_state_for_room(
destination=dest, room_id=room_id, event_id=e_id
)
auth_events.update({a.event_id: a for a in auth})