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Fix and clean up publicRooms pagination

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This commit is contained in:
Erik Johnston 2016-09-17 14:40:28 +01:00
parent 995f2f032f
commit 71edaae981
1 changed files with 123 additions and 110 deletions
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167
synapse/handlers/room_list.py
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@ -115,32 +115,109 @@ class RoomListHandler(BaseHandler):
sorted_entries = sorted(rooms_to_order_value.items(), key=lambda e: e[1])
sorted_rooms = [room_id for room_id, _ in sorted_entries]
# `sorted_rooms` should now be a list of all public room ids that is
# stable across pagination. Therefore, we can use indices into this
# list as our pagination tokens.
# Filter out rooms that we don't want to return
rooms_to_scan = [
r for r in sorted_rooms
if r not in newly_unpublished and rooms_to_num_joined[room_id] > 0
]
if since_token:
# Filter out rooms we've already returned previously
# `since_token.current_limit` is the index of the last room we
# sent down, so we exclude it and everything before/after it.
if since_token.direction_is_forward:
sorted_rooms = sorted_rooms[since_token.current_limit:]
rooms_to_scan = rooms_to_scan[since_token.current_limit + 1:]
else:
sorted_rooms = sorted_rooms[:since_token.current_limit]
sorted_rooms.reverse()
rooms_to_scan = rooms_to_scan[:since_token.current_limit]
rooms_to_scan.reverse()
rooms_to_scan = sorted_rooms
# If there's not search filter just limit the range since we'll
# return the vast majority of things.
if limit and not search_filter:
rooms_to_scan = sorted_rooms[:limit + 1]
rooms_to_scan = rooms_to_scan[:limit + 1]
# Actually generate the entries. _generate_room_entry will append to
# chunk but will stop if len(chunk) > limit
chunk = []
yield concurrently_execute(
lambda r: self._generate_room_entry(
r, rooms_to_num_joined[r],
chunk, limit, search_filter
),
rooms_to_scan, 10
)
chunk.sort(key=lambda e: (-e["num_joined_members"], e["room_id"]))
# Work out the new limit of the batch for pagination, or None if we
# know there are no more results that would be returned.
# i.e., [since_token.current_limit..new_limit] is the batch of rooms
# we've returned (or the reverse if we paginated backwards)
# We tried to pull out limit + 1 rooms above, so if we have <= limit
# then we know there are no more results to return
new_limit = None
if chunk and (not limit or len(chunk) > limit):
if not since_token or since_token.direction_is_forward:
if limit:
chunk = chunk[:limit]
last_room_id = chunk[-1]["room_id"]
else:
if limit:
chunk = chunk[-limit:]
last_room_id = chunk[0]["room_id"]
new_limit = sorted_rooms.index(last_room_id)
results = {
"chunk": chunk,
}
if since_token:
results["new_rooms"] = bool(newly_visible)
if not since_token or since_token.direction_is_forward:
if new_limit is not None:
results["next_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=True,
).to_token()
if since_token:
results["prev_batch"] = since_token.copy_and_replace(
direction_is_forward=False,
current_limit=since_token.current_limit + 1,
).to_token()
else:
if new_limit is not None:
results["prev_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=False,
).to_token()
if since_token:
results["next_batch"] = since_token.copy_and_replace(
direction_is_forward=True,
current_limit=since_token.current_limit - 1,
).to_token()
defer.returnValue(results)
@defer.inlineCallbacks
def handle_room(room_id):
def _generate_room_entry(self, room_id, num_joined_users, chunk, limit,
search_filter):
if limit and len(chunk) > limit + 1:
# We've already got enough, so lets just drop it.
return
num_joined_users = rooms_to_num_joined[room_id]
if num_joined_users == 0:
return
if room_id in newly_unpublished:
return
result = {
"room_id": room_id,
"num_joined_members": num_joined_users,
@ -216,70 +293,6 @@ class RoomListHandler(BaseHandler):
if _matches_room_entry(result, search_filter):
chunk.append(result)
yield concurrently_execute(handle_room, rooms_to_scan, 10)
chunk.sort(key=lambda e: (-e["num_joined_members"], e["room_id"]))
# Work out the new limit of the batch for pagination, or None if we
# know there are no more results that would be returned.
new_limit = None
if chunk and (not limit or len(chunk) > limit):
if limit:
chunk = chunk[:limit]
addition = 1
if since_token:
addition += since_token.current_limit
if not since_token or since_token.direction_is_forward:
last_room_id = chunk[-1]["room_id"]
else:
last_room_id = chunk[0]["room_id"]
addition *= -1
try:
new_limit = sorted_rooms.index(last_room_id) + addition
if new_limit >= len(sorted_rooms):
new_limit = None
except ValueError:
pass
results = {
"chunk": chunk,
}
if since_token:
results["new_rooms"] = bool(newly_visible)
if not since_token or since_token.direction_is_forward:
if new_limit:
results["next_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=True,
).to_token()
if since_token:
results["prev_batch"] = since_token.copy_and_replace(
direction_is_forward=False,
).to_token()
else:
if new_limit:
results["prev_batch"] = RoomListNextBatch(
stream_ordering=stream_token,
public_room_stream_id=public_room_stream_id,
current_limit=new_limit,
direction_is_forward=False,
).to_token()
if since_token:
results["next_batch"] = since_token.copy_and_replace(
direction_is_forward=True,
).to_token()
defer.returnValue(results)
@defer.inlineCallbacks
def get_remote_public_room_list(self, server_name, limit=None, since_token=None,
search_filter=None):