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Add missing type hints to event fetching. (#11121)
Updates the event rows returned from the database to be attrs classes instead of dictionaries.
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changelog.d/11121.misc
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changelog.d/11121.misc
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Add type hints for event fetching.
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@ -55,8 +55,9 @@ from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
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from synapse.replication.tcp.streams import BackfillStream
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from synapse.replication.tcp.streams.events import EventsStream
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from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
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from synapse.storage.database import DatabasePool
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from synapse.storage.database import DatabasePool, LoggingTransaction
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from synapse.storage.engines import PostgresEngine
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from synapse.storage.types import Connection
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from synapse.storage.util.id_generators import MultiWriterIdGenerator, StreamIdGenerator
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from synapse.storage.util.sequence import build_sequence_generator
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from synapse.types import JsonDict, get_domain_from_id
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@ -86,6 +87,47 @@ class _EventCacheEntry:
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redacted_event: Optional[EventBase]
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class _EventRow:
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"""
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An event, as pulled from the database.
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Properties:
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event_id: The event ID of the event.
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stream_ordering: stream ordering for this event
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json: json-encoded event structure
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internal_metadata: json-encoded internal metadata dict
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format_version: The format of the event. Hopefully one of EventFormatVersions.
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'None' means the event predates EventFormatVersions (so the event is format V1).
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room_version_id: The version of the room which contains the event. Hopefully
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one of RoomVersions.
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Due to historical reasons, there may be a few events in the database which
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do not have an associated room; in this case None will be returned here.
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rejected_reason: if the event was rejected, the reason why.
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redactions: a list of event-ids which (claim to) redact this event.
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outlier: True if this event is an outlier.
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"""
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event_id: str
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stream_ordering: int
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json: str
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internal_metadata: str
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format_version: Optional[int]
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room_version_id: Optional[int]
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rejected_reason: Optional[str]
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redactions: List[str]
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outlier: bool
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class EventRedactBehaviour(Names):
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"""
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What to do when retrieving a redacted event from the database.
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@ -686,7 +728,7 @@ class EventsWorkerStore(SQLBaseStore):
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for e in state_to_include.values()
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]
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def _do_fetch(self, conn):
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def _do_fetch(self, conn: Connection) -> None:
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"""Takes a database connection and waits for requests for events from
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the _event_fetch_list queue.
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"""
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@ -713,13 +755,15 @@ class EventsWorkerStore(SQLBaseStore):
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self._fetch_event_list(conn, event_list)
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def _fetch_event_list(self, conn, event_list):
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def _fetch_event_list(
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self, conn: Connection, event_list: List[Tuple[List[str], defer.Deferred]]
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) -> None:
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"""Handle a load of requests from the _event_fetch_list queue
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Args:
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conn (twisted.enterprise.adbapi.Connection): database connection
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conn: database connection
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event_list (list[Tuple[list[str], Deferred]]):
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event_list:
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The fetch requests. Each entry consists of a list of event
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ids to be fetched, and a deferred to be completed once the
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events have been fetched.
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@ -788,7 +832,7 @@ class EventsWorkerStore(SQLBaseStore):
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row = row_map.get(event_id)
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fetched_events[event_id] = row
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if row:
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redaction_ids.update(row["redactions"])
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redaction_ids.update(row.redactions)
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events_to_fetch = redaction_ids.difference(fetched_events.keys())
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if events_to_fetch:
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@ -799,32 +843,32 @@ class EventsWorkerStore(SQLBaseStore):
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for event_id, row in fetched_events.items():
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if not row:
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continue
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assert row["event_id"] == event_id
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assert row.event_id == event_id
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rejected_reason = row["rejected_reason"]
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rejected_reason = row.rejected_reason
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# If the event or metadata cannot be parsed, log the error and act
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# as if the event is unknown.
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try:
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d = db_to_json(row["json"])
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d = db_to_json(row.json)
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except ValueError:
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logger.error("Unable to parse json from event: %s", event_id)
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continue
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try:
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internal_metadata = db_to_json(row["internal_metadata"])
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internal_metadata = db_to_json(row.internal_metadata)
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except ValueError:
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logger.error(
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"Unable to parse internal_metadata from event: %s", event_id
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)
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continue
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format_version = row["format_version"]
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format_version = row.format_version
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if format_version is None:
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# This means that we stored the event before we had the concept
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# of a event format version, so it must be a V1 event.
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format_version = EventFormatVersions.V1
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room_version_id = row["room_version_id"]
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room_version_id = row.room_version_id
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if not room_version_id:
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# this should only happen for out-of-band membership events which
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@ -889,8 +933,8 @@ class EventsWorkerStore(SQLBaseStore):
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internal_metadata_dict=internal_metadata,
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rejected_reason=rejected_reason,
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)
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original_ev.internal_metadata.stream_ordering = row["stream_ordering"]
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original_ev.internal_metadata.outlier = row["outlier"]
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original_ev.internal_metadata.stream_ordering = row.stream_ordering
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original_ev.internal_metadata.outlier = row.outlier
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event_map[event_id] = original_ev
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@ -898,7 +942,7 @@ class EventsWorkerStore(SQLBaseStore):
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# the cache entries.
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result_map = {}
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for event_id, original_ev in event_map.items():
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redactions = fetched_events[event_id]["redactions"]
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redactions = fetched_events[event_id].redactions
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redacted_event = self._maybe_redact_event_row(
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original_ev, redactions, event_map
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)
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@ -912,17 +956,17 @@ class EventsWorkerStore(SQLBaseStore):
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return result_map
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async def _enqueue_events(self, events):
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async def _enqueue_events(self, events: Iterable[str]) -> Dict[str, _EventRow]:
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"""Fetches events from the database using the _event_fetch_list. This
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allows batch and bulk fetching of events - it allows us to fetch events
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without having to create a new transaction for each request for events.
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Args:
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events (Iterable[str]): events to be fetched.
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events: events to be fetched.
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Returns:
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Dict[str, Dict]: map from event id to row data from the database.
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May contain events that weren't requested.
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A map from event id to row data from the database. May contain events
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that weren't requested.
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"""
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events_d = defer.Deferred()
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@ -949,43 +993,19 @@ class EventsWorkerStore(SQLBaseStore):
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return row_map
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def _fetch_event_rows(self, txn, event_ids):
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def _fetch_event_rows(
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self, txn: LoggingTransaction, event_ids: Iterable[str]
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) -> Dict[str, _EventRow]:
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"""Fetch event rows from the database
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Events which are not found are omitted from the result.
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The returned per-event dicts contain the following keys:
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* event_id (str)
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* stream_ordering (int): stream ordering for this event
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* json (str): json-encoded event structure
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* internal_metadata (str): json-encoded internal metadata dict
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* format_version (int|None): The format of the event. Hopefully one
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of EventFormatVersions. 'None' means the event predates
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EventFormatVersions (so the event is format V1).
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* room_version_id (str|None): The version of the room which contains the event.
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Hopefully one of RoomVersions.
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Due to historical reasons, there may be a few events in the database which
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do not have an associated room; in this case None will be returned here.
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* rejected_reason (str|None): if the event was rejected, the reason
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why.
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* redactions (List[str]): a list of event-ids which (claim to) redact
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this event.
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Args:
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txn (twisted.enterprise.adbapi.Connection):
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event_ids (Iterable[str]): event IDs to fetch
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txn: The database transaction.
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event_ids: event IDs to fetch
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Returns:
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Dict[str, Dict]: a map from event id to event info.
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A map from event id to event info.
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"""
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event_dict = {}
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for evs in batch_iter(event_ids, 200):
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@ -1013,17 +1033,17 @@ class EventsWorkerStore(SQLBaseStore):
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for row in txn:
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event_id = row[0]
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event_dict[event_id] = {
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"event_id": event_id,
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"stream_ordering": row[1],
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"internal_metadata": row[2],
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"json": row[3],
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"format_version": row[4],
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"room_version_id": row[5],
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"rejected_reason": row[6],
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"redactions": [],
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"outlier": row[7],
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}
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event_dict[event_id] = _EventRow(
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event_id=event_id,
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stream_ordering=row[1],
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internal_metadata=row[2],
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json=row[3],
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format_version=row[4],
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room_version_id=row[5],
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rejected_reason=row[6],
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redactions=[],
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outlier=row[7],
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)
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# check for redactions
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redactions_sql = "SELECT event_id, redacts FROM redactions WHERE "
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@ -1035,7 +1055,7 @@ class EventsWorkerStore(SQLBaseStore):
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for (redacter, redacted) in txn:
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d = event_dict.get(redacted)
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if d:
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d["redactions"].append(redacter)
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d.redactions.append(redacter)
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return event_dict
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