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Refactor pagination DB API to return concrete type

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This makes it easier to document what is being returned by the storage
functions and what some functions expect as arguments.
This commit is contained in:
Erik Johnston 2018-05-09 11:18:23 +01:00
parent 7dd13415db
commit 05e0a2462c
1 changed files with 48 additions and 28 deletions
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76
synapse/storage/stream.py
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@ -47,6 +47,7 @@ import abc
import logging import logging
from six.moves import range from six.moves import range
from collections import namedtuple
logger = logging.getLogger(__name__) logger = logging.getLogger(__name__)
@ -59,6 +60,12 @@ _STREAM_TOKEN = "stream"
_TOPOLOGICAL_TOKEN = "topological" _TOPOLOGICAL_TOKEN = "topological"
# Used as return values for pagination APIs
_EventDictReturn = namedtuple("_EventDictReturn", (
"event_id", "topological_ordering", "stream_ordering",
))
def lower_bound(token, engine, inclusive=False): def lower_bound(token, engine, inclusive=False):
inclusive = "=" if inclusive else "" inclusive = "=" if inclusive else ""
if token.topological is None: if token.topological is None:
@ -256,9 +263,13 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
" ORDER BY stream_ordering %s LIMIT ?" " ORDER BY stream_ordering %s LIMIT ?"
) % (order,) ) % (order,)
txn.execute(sql, (room_id, from_id, to_id, limit)) txn.execute(sql, (room_id, from_id, to_id, limit))
rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
else: else:
sql = ( sql = (
"SELECT event_id, stream_ordering FROM events WHERE" "SELECT event_id, topological_ordering, stream_ordering"
" FROM events"
" WHERE"
" room_id = ?" " room_id = ?"
" AND not outlier" " AND not outlier"
" AND stream_ordering <= ?" " AND stream_ordering <= ?"
@ -266,14 +277,14 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
) % (order, order,) ) % (order, order,)
txn.execute(sql, (room_id, to_id, limit)) txn.execute(sql, (room_id, to_id, limit))
rows = self.cursor_to_dict(txn) rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]
return rows return rows
rows = yield self.runInteraction("get_room_events_stream_for_room", f) rows = yield self.runInteraction("get_room_events_stream_for_room", f)
ret = yield self._get_events( ret = yield self._get_events(
[r["event_id"] for r in rows], [r.event_id for r in rows],
get_prev_content=True get_prev_content=True
) )
@ -283,7 +294,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
ret.reverse() ret.reverse()
if rows: if rows:
key = "s%d" % min(r["stream_ordering"] for r in rows) key = "s%d" % min(r.stream_ordering for r in rows)
else: else:
# Assume we didn't get anything because there was nothing to # Assume we didn't get anything because there was nothing to
# get. # get.
@ -330,14 +341,15 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
" ORDER BY stream_ordering ASC" " ORDER BY stream_ordering ASC"
) )
txn.execute(sql, (user_id, to_id,)) txn.execute(sql, (user_id, to_id,))
rows = self.cursor_to_dict(txn)
rows = [_EventDictReturn(row[0], None, row[1]) for row in txn]
return rows return rows
rows = yield self.runInteraction("get_membership_changes_for_user", f) rows = yield self.runInteraction("get_membership_changes_for_user", f)
ret = yield self._get_events( ret = yield self._get_events(
[r["event_id"] for r in rows], [r.event_id for r in rows],
get_prev_content=True get_prev_content=True
) )
@ -353,14 +365,14 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
logger.debug("stream before") logger.debug("stream before")
events = yield self._get_events( events = yield self._get_events(
[r["event_id"] for r in rows], [r.event_id for r in rows],
get_prev_content=True get_prev_content=True
) )
logger.debug("stream after") logger.debug("stream after")
self._set_before_and_after(events, rows) self._set_before_and_after(events, rows)
defer.returnValue((events, token)) defer.returnValue((events, (token, end_token)))
@defer.inlineCallbacks @defer.inlineCallbacks
def get_recent_event_ids_for_room(self, room_id, limit, end_token): def get_recent_event_ids_for_room(self, room_id, limit, end_token):
@ -372,15 +384,14 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
end_token (str): The stream token representing now. end_token (str): The stream token representing now.
Returns: Returns:
Deferred[tuple[list[dict], tuple[str, str]]]: Returns a list of Deferred[tuple[list[_EventDictReturn], str]]: Returns a list of
dicts (which include event_ids, etc), and a tuple for _EventDictReturn and a token pointint to the start of the returned
`(start_token, end_token)` representing the range of rows events.
returned. The events returned are in ascending order.
The returned events are in ascending order.
""" """
# Allow a zero limit here, and no-op. # Allow a zero limit here, and no-op.
if limit == 0: if limit == 0:
defer.returnValue(([], (end_token, end_token))) defer.returnValue(([], end_token))
end_token = RoomStreamToken.parse_stream_token(end_token) end_token = RoomStreamToken.parse_stream_token(end_token)
@ -392,7 +403,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
# We want to return the results in ascending order. # We want to return the results in ascending order.
rows.reverse() rows.reverse()
defer.returnValue((rows, (token, str(end_token)))) defer.returnValue((rows, token))
def get_room_event_after_stream_ordering(self, room_id, stream_ordering): def get_room_event_after_stream_ordering(self, room_id, stream_ordering):
"""Gets details of the first event in a room at or after a stream ordering """Gets details of the first event in a room at or after a stream ordering
@ -496,10 +507,19 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
@staticmethod @staticmethod
def _set_before_and_after(events, rows, topo_order=True): def _set_before_and_after(events, rows, topo_order=True):
"""Inserts ordering information to events' internal metadata from
the DB rows.
Args:
events (list[FrozenEvent])
rows (list[_EventDictReturn])
topo_order (bool): Whether the events were ordered topologically
or by stream ordering
"""
for event, row in zip(events, rows): for event, row in zip(events, rows):
stream = row["stream_ordering"] stream = row.stream_ordering
if topo_order: if topo_order and row.topological_ordering:
topo = event.depth topo = row.topological_ordering
else: else:
topo = None topo = None
internal = event.internal_metadata internal = event.internal_metadata
@ -586,12 +606,12 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
rows, start_token = self._paginate_room_events_txn( rows, start_token = self._paginate_room_events_txn(
txn, room_id, before_token, direction='b', limit=before_limit, txn, room_id, before_token, direction='b', limit=before_limit,
) )
events_before = [r["event_id"] for r in rows] events_before = [r.event_id for r in rows]
rows, end_token = self._paginate_room_events_txn( rows, end_token = self._paginate_room_events_txn(
txn, room_id, after_token, direction='f', limit=after_limit, txn, room_id, after_token, direction='f', limit=after_limit,
) )
events_after = [r["event_id"] for r in rows] events_after = [r.event_id for r in rows]
return { return {
"before": { "before": {
@ -672,9 +692,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
those that match the filter. those that match the filter.
Returns: Returns:
tuple[list[dict], str]: Returns the results as a list of dicts and tuple[list[_EventDictReturn], str]: Returns the results as a list
a token that points to the end of the result set. The dicts have of _EventDictReturn and a token that points to the end of the
the keys "event_id", "toplogical_ordering" and "stream_ordering". result set.
""" """
# Tokens really represent positions between elements, but we use # Tokens really represent positions between elements, but we use
# the convention of pointing to the event before the gap. Hence # the convention of pointing to the event before the gap. Hence
@ -725,11 +745,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
txn.execute(sql, args) txn.execute(sql, args)
rows = self.cursor_to_dict(txn) rows = [_EventDictReturn(row[0], row[1], row[2]) for row in txn]
if rows: if rows:
topo = rows[-1]["topological_ordering"] topo = rows[-1].topological_ordering
toke = rows[-1]["stream_ordering"] toke = rows[-1].stream_ordering
if direction == 'b': if direction == 'b':
# Tokens are positions between events. # Tokens are positions between events.
# This token points *after* the last event in the chunk. # This token points *after* the last event in the chunk.
@ -764,7 +784,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
Returns: Returns:
tuple[list[dict], str]: Returns the results as a list of dicts and tuple[list[dict], str]: Returns the results as a list of dicts and
a token that points to the end of the result set. The dicts have a token that points to the end of the result set. The dicts have
the keys "event_id", "toplogical_ordering" and "stream_orderign". the keys "event_id", "topological_ordering" and "stream_orderign".
""" """
from_key = RoomStreamToken.parse(from_key) from_key = RoomStreamToken.parse(from_key)
@ -777,7 +797,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
) )
events = yield self._get_events( events = yield self._get_events(
[r["event_id"] for r in rows], [r.event_id for r in rows],
get_prev_content=True get_prev_content=True
) )