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116 lines
3.9 KiB
Python
116 lines
3.9 KiB
Python
# Copyright 2024 LanceDB Developers
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This module contains an adapter that will close connections if they have not been
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# used before a certain timeout. This is necessary because some load balancers will
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# close connections after a certain amount of time, but the request module may not yet
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# have received the FIN/ACK and will try to reuse the connection.
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#
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# TODO some of the code here can be simplified if/when this PR is merged:
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# https://github.com/urllib3/urllib3/pull/3275
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import datetime
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import logging
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import os
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from requests.adapters import HTTPAdapter
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from urllib3.connection import HTTPSConnection
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from urllib3.connectionpool import HTTPSConnectionPool
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from urllib3.poolmanager import PoolManager
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def get_client_connection_timeout() -> int:
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return int(os.environ.get("LANCE_CLIENT_CONNECTION_TIMEOUT", "300"))
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class LanceDBHTTPSConnection(HTTPSConnection):
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"""
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HTTPSConnection that tracks the last time it was used.
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"""
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idle_timeout: datetime.timedelta
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last_activity: datetime.datetime
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.last_activity = datetime.datetime.now()
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def request(self, *args, **kwargs):
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self.last_activity = datetime.datetime.now()
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super().request(*args, **kwargs)
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def is_expired(self):
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return datetime.datetime.now() - self.last_activity > self.idle_timeout
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def LanceDBHTTPSConnectionPoolFactory(client_idle_timeout: int):
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"""
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Creates a connection pool class that can be used to close idle connections.
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"""
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class LanceDBHTTPSConnectionPool(HTTPSConnectionPool):
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# override the connection class
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ConnectionCls = LanceDBHTTPSConnection
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def _get_conn(self, timeout: float | None = None):
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logging.debug("Getting https connection")
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conn = super()._get_conn(timeout)
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if conn.is_expired():
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logging.debug("Closing expired connection")
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conn.close()
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return conn
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def _new_conn(self):
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conn = super()._new_conn()
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conn.idle_timeout = datetime.timedelta(seconds=client_idle_timeout)
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return conn
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return LanceDBHTTPSConnectionPool
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class LanceDBClientPoolManager(PoolManager):
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def __init__(
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self, client_idle_timeout: int, num_pools: int, maxsize: int, **kwargs
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):
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super().__init__(num_pools=num_pools, maxsize=maxsize, **kwargs)
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# inject our connection pool impl
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connection_pool_class = LanceDBHTTPSConnectionPoolFactory(
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client_idle_timeout=client_idle_timeout
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)
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self.pool_classes_by_scheme["https"] = connection_pool_class
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def LanceDBClientHTTPAdapterFactory():
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"""
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Creates an HTTPAdapter class that can be used to close idle connections
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"""
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# closure over the timeout
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client_idle_timeout = get_client_connection_timeout()
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class LanceDBClientRequestHTTPAdapter(HTTPAdapter):
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def init_poolmanager(self, connections, maxsize, block=False):
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# inject our pool manager impl
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self.poolmanager = LanceDBClientPoolManager(
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client_idle_timeout=client_idle_timeout,
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num_pools=connections,
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maxsize=maxsize,
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block=block,
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)
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return LanceDBClientRequestHTTPAdapter
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