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Stronger typing in the federation handler (#6480)

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replace the event_info dict with an attrs thing
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Richard van der Hoff 2019-12-05 15:02:35 +00:00 committed by GitHub
parent e1f4c83f41
commit 63d6ad1064
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2 changed files with 58 additions and 24 deletions
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1
changelog.d/6480.misc Normal file
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@ -0,0 +1 @@
Refactor some code in the event authentication path for clarity.

81
synapse/handlers/federation.py
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@ -19,11 +19,13 @@
import itertools
import logging
from typing import Dict, Iterable, Optional, Sequence, Tuple
import six
from six import iteritems, itervalues
from six.moves import http_client, zip
import attr
from signedjson.key import decode_verify_key_bytes
from signedjson.sign import verify_signed_json
from unpaddedbase64 import decode_base64
@ -45,6 +47,7 @@ from synapse.api.errors import (
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
from synapse.crypto.event_signing import compute_event_signature
from synapse.event_auth import auth_types_for_event
from synapse.events import EventBase
from synapse.events.snapshot import EventContext
from synapse.events.validator import EventValidator
from synapse.logging.context import (
@ -72,6 +75,23 @@ from ._base import BaseHandler
logger = logging.getLogger(__name__)
@attr.s
class _NewEventInfo:
"""Holds information about a received event, ready for passing to _handle_new_events
Attributes:
event: the received event
state: the state at that event
auth_events: the auth_event map for that event
"""
event = attr.ib(type=EventBase)
state = attr.ib(type=Optional[Sequence[EventBase]], default=None)
auth_events = attr.ib(type=Optional[Dict[Tuple[str, str], EventBase]], default=None)
def shortstr(iterable, maxitems=5):
"""If iterable has maxitems or fewer, return the stringification of a list
containing those items.
@ -597,14 +617,14 @@ class FederationHandler(BaseHandler):
for e in auth_chain
if e.event_id in auth_ids or e.type == EventTypes.Create
}
event_infos.append({"event": e, "auth_events": auth})
event_infos.append(_NewEventInfo(event=e, auth_events=auth))
seen_ids.add(e.event_id)
logger.info(
"[%s %s] persisting newly-received auth/state events %s",
room_id,
event_id,
[e["event"].event_id for e in event_infos],
[e.event.event_id for e in event_infos],
)
yield self._handle_new_events(origin, event_infos)
@ -795,9 +815,9 @@ class FederationHandler(BaseHandler):
a.internal_metadata.outlier = True
ev_infos.append(
{
"event": a,
"auth_events": {
_NewEventInfo(
event=a,
auth_events={
(
auth_events[a_id].type,
auth_events[a_id].state_key,
@ -805,7 +825,7 @@ class FederationHandler(BaseHandler):
for a_id in a.auth_event_ids()
if a_id in auth_events
},
}
)
)
# Step 1b: persist the events in the chunk we fetched state for (i.e.
@ -817,10 +837,10 @@ class FederationHandler(BaseHandler):
assert not ev.internal_metadata.is_outlier()
ev_infos.append(
{
"event": ev,
"state": events_to_state[e_id],
"auth_events": {
_NewEventInfo(
event=ev,
state=events_to_state[e_id],
auth_events={
(
auth_events[a_id].type,
auth_events[a_id].state_key,
@ -828,7 +848,7 @@ class FederationHandler(BaseHandler):
for a_id in ev.auth_event_ids()
if a_id in auth_events
},
}
)
)
yield self._handle_new_events(dest, ev_infos, backfilled=True)
@ -1713,7 +1733,12 @@ class FederationHandler(BaseHandler):
return context
@defer.inlineCallbacks
def _handle_new_events(self, origin, event_infos, backfilled=False):
def _handle_new_events(
self,
origin: str,
event_infos: Iterable[_NewEventInfo],
backfilled: bool = False,
):
"""Creates the appropriate contexts and persists events. The events
should not depend on one another, e.g. this should be used to persist
a bunch of outliers, but not a chunk of individual events that depend
@ -1723,14 +1748,14 @@ class FederationHandler(BaseHandler):
"""
@defer.inlineCallbacks
def prep(ev_info):
event = ev_info["event"]
def prep(ev_info: _NewEventInfo):
event = ev_info.event
with nested_logging_context(suffix=event.event_id):
res = yield self._prep_event(
origin,
event,
state=ev_info.get("state"),
auth_events=ev_info.get("auth_events"),
state=ev_info.state,
auth_events=ev_info.auth_events,
backfilled=backfilled,
)
return res
@ -1744,7 +1769,7 @@ class FederationHandler(BaseHandler):
yield self.persist_events_and_notify(
[
(ev_info["event"], context)
(ev_info.event, context)
for ev_info, context in zip(event_infos, contexts)
],
backfilled=backfilled,
@ -1846,7 +1871,14 @@ class FederationHandler(BaseHandler):
yield self.persist_events_and_notify([(event, new_event_context)])
@defer.inlineCallbacks
def _prep_event(self, origin, event, state, auth_events, backfilled):
def _prep_event(
self,
origin: str,
event: EventBase,
state: Optional[Iterable[EventBase]],
auth_events: Optional[Dict[Tuple[str, str], EventBase]],
backfilled: bool,
):
"""
Args:
@ -1854,7 +1886,7 @@ class FederationHandler(BaseHandler):
event:
state:
auth_events:
backfilled (bool)
backfilled:
Returns:
Deferred, which resolves to synapse.events.snapshot.EventContext
@ -1890,15 +1922,16 @@ class FederationHandler(BaseHandler):
return context
@defer.inlineCallbacks
def _check_for_soft_fail(self, event, state, backfilled):
def _check_for_soft_fail(
self, event: EventBase, state: Optional[Iterable[EventBase]], backfilled: bool
):
"""Checks if we should soft fail the event, if so marks the event as
such.
Args:
event (FrozenEvent)
state (dict|None): The state at the event if we don't have all the
event's prev events
backfilled (bool): Whether the event is from backfill
event
state: The state at the event if we don't have all the event's prev events
backfilled: Whether the event is from backfill
Returns:
Deferred