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Add support for persisting event format versions

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Currently we only have the one event format version defined, but this
adds the necessary infrastructure to persist and fetch the format
versions alongside the events.

We specify the format version rather than the room version as:

1. We don't necessarily know the room version, existing events may be
   either v1 or v2.
2. We'd need to be careful to prevent/handle correctly if different
   events in the same room reported to be of different versions, which
   sounds annoying.
This commit is contained in:
Erik Johnston 2019-01-23 11:11:52 +00:00
parent 12699a701f
commit c5a296b10c
5 changed files with 50 additions and 4 deletions
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19
synapse/storage/events_worker.py
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@ -21,11 +21,11 @@ from canonicaljson import json
from twisted.internet import defer
from synapse.api.constants import EventFormatVersions
from synapse.api.errors import NotFoundError
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
from synapse.events import FrozenEvent
from synapse.events.snapshot import EventContext # noqa: F401
from synapse.events import FrozenEvent
from synapse.events.utils import prune_event
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util.logcontext import (
@ -353,6 +353,7 @@ class EventsWorkerStore(SQLBaseStore):
self._get_event_from_row,
row["internal_metadata"], row["json"], row["redacts"],
rejected_reason=row["rejects"],
format_version=row["format_version"],
)
for row in rows
],
@ -377,6 +378,7 @@ class EventsWorkerStore(SQLBaseStore):
" e.event_id as event_id, "
" e.internal_metadata,"
" e.json,"
" e.format_version, "
" r.redacts as redacts,"
" rej.event_id as rejects "
" FROM event_json as e"
@ -392,7 +394,7 @@ class EventsWorkerStore(SQLBaseStore):
@defer.inlineCallbacks
def _get_event_from_row(self, internal_metadata, js, redacted,
rejected_reason=None):
format_version, rejected_reason=None):
with Measure(self._clock, "_get_event_from_row"):
d = json.loads(js)
internal_metadata = json.loads(internal_metadata)
@ -405,8 +407,17 @@ class EventsWorkerStore(SQLBaseStore):
desc="_get_event_from_row_rejected_reason",
)
if format_version is None:
# This means that we stored the event before we had the concept
# of a event format version, so it must be a V1 event.
format_version = EventFormatVersions.V1
# TODO: When we implement new event formats we'll need to use a
# different event python type
assert format_version == EventFormatVersions.V1
original_ev = FrozenEvent(
d,
event_dict=d,
internal_metadata_dict=internal_metadata,
rejected_reason=rejected_reason,
)