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Merge pull request #694 from matrix-org/markjh/caches

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Move _get_cache_dict into the SQLBaseStore
This commit is contained in:
Mark Haines 2016-04-06 13:21:25 +01:00
commit 7d11f825aa
2 changed files with 34 additions and 33 deletions
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33
synapse/storage/__init__.py
View File

@ -177,39 +177,6 @@ class DataStore(RoomMemberStore, RoomStore,
self.__presence_on_startup = None
return active_on_startup
def _get_cache_dict(self, db_conn, table, entity_column, stream_column, max_value):
# Fetch a mapping of room_id -> max stream position for "recent" rooms.
# It doesn't really matter how many we get, the StreamChangeCache will
# do the right thing to ensure it respects the max size of cache.
sql = (
"SELECT %(entity)s, MAX(%(stream)s) FROM %(table)s"
" WHERE %(stream)s > ? - 100000"
" GROUP BY %(entity)s"
) % {
"table": table,
"entity": entity_column,
"stream": stream_column,
}
sql = self.database_engine.convert_param_style(sql)
txn = db_conn.cursor()
txn.execute(sql, (int(max_value),))
rows = txn.fetchall()
txn.close()
cache = {
row[0]: int(row[1])
for row in rows
}
if cache:
min_val = min(cache.values())
else:
min_val = max_value
return cache, min_val
def _get_active_presence(self, db_conn):
"""Fetch non-offline presence from the database so that we can register
the appropriate time outs.

34
synapse/storage/_base.py
View File

@ -816,6 +816,40 @@ class SQLBaseStore(object):
self._next_stream_id += 1
return i
def _get_cache_dict(self, db_conn, table, entity_column, stream_column,
max_value):
# Fetch a mapping of room_id -> max stream position for "recent" rooms.
# It doesn't really matter how many we get, the StreamChangeCache will
# do the right thing to ensure it respects the max size of cache.
sql = (
"SELECT %(entity)s, MAX(%(stream)s) FROM %(table)s"
" WHERE %(stream)s > ? - 100000"
" GROUP BY %(entity)s"
) % {
"table": table,
"entity": entity_column,
"stream": stream_column,
}
sql = self.database_engine.convert_param_style(sql)
txn = db_conn.cursor()
txn.execute(sql, (int(max_value),))
rows = txn.fetchall()
txn.close()
cache = {
row[0]: int(row[1])
for row in rows
}
if cache:
min_val = min(cache.values())
else:
min_val = max_value
return cache, min_val
class _RollbackButIsFineException(Exception):
""" This exception is used to rollback a transaction without implying