mirror of https://github.com/zulip/zulip.git
94 lines
3.1 KiB
Python
94 lines
3.1 KiB
Python
|
|
from typing import (Dict, List)
|
|
|
|
from django.db import connection
|
|
from zerver.models import Recipient
|
|
|
|
class StreamRecipientMap:
|
|
'''
|
|
This class maps stream_id -> recipient_id and vice versa.
|
|
It is useful for bulk operations. Call the populate_* methods
|
|
to initialize the data structures. You should try to avoid
|
|
excessive queries by finding ids up front, but you can call
|
|
this repeatedly, and it will only look up new ids.
|
|
|
|
You should ONLY use this class for READ operations.
|
|
|
|
Note that this class uses raw SQL, because we want to highly
|
|
optimize page loads.
|
|
'''
|
|
def __init__(self) -> None:
|
|
self.recip_to_stream = dict() # type: Dict[int, int]
|
|
self.stream_to_recip = dict() # type: Dict[int, int]
|
|
|
|
def populate_for_stream_ids(self, stream_ids: List[int]) -> None:
|
|
stream_ids = sorted([
|
|
stream_id for stream_id in stream_ids
|
|
if stream_id not in self.stream_to_recip
|
|
])
|
|
|
|
if not stream_ids:
|
|
return
|
|
|
|
# see comment at the top of the class
|
|
id_list = ', '.join(str(stream_id) for stream_id in stream_ids)
|
|
query = '''
|
|
SELECT
|
|
zerver_recipient.id as recipient_id,
|
|
zerver_stream.id as stream_id
|
|
FROM
|
|
zerver_stream
|
|
INNER JOIN zerver_recipient ON
|
|
zerver_stream.id = zerver_recipient.type_id
|
|
WHERE
|
|
zerver_recipient.type = %d
|
|
AND
|
|
zerver_stream.id in (%s)
|
|
''' % (Recipient.STREAM, id_list)
|
|
self._process_query(query)
|
|
|
|
def populate_for_recipient_ids(self, recipient_ids: List[int]) -> None:
|
|
recipient_ids = sorted([
|
|
recip_id for recip_id in recipient_ids
|
|
if recip_id not in self.recip_to_stream
|
|
])
|
|
|
|
if not recipient_ids:
|
|
return
|
|
|
|
# see comment at the top of the class
|
|
id_list = ', '.join(str(recip_id) for recip_id in recipient_ids)
|
|
query = '''
|
|
SELECT
|
|
zerver_recipient.id as recipient_id,
|
|
zerver_stream.id as stream_id
|
|
FROM
|
|
zerver_recipient
|
|
INNER JOIN zerver_stream ON
|
|
zerver_stream.id = zerver_recipient.type_id
|
|
WHERE
|
|
zerver_recipient.type = %d
|
|
AND
|
|
zerver_recipient.id in (%s)
|
|
''' % (Recipient.STREAM, id_list)
|
|
|
|
self._process_query(query)
|
|
|
|
def _process_query(self, query: str) -> None:
|
|
cursor = connection.cursor()
|
|
cursor.execute(query)
|
|
rows = cursor.fetchall()
|
|
cursor.close()
|
|
for recip_id, stream_id in rows:
|
|
self.recip_to_stream[recip_id] = stream_id
|
|
self.stream_to_recip[stream_id] = recip_id
|
|
|
|
def recipient_id_for(self, stream_id: int) -> int:
|
|
return self.stream_to_recip[stream_id]
|
|
|
|
def stream_id_for(self, recip_id: int) -> int:
|
|
return self.recip_to_stream[recip_id]
|
|
|
|
def recipient_to_stream_id_dict(self) -> Dict[int, int]:
|
|
return self.recip_to_stream
|