132 lines
4.5 KiB
Python
132 lines
4.5 KiB
Python
# Copyright (C) 2026-present MongoDB, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the Server Side Public License, version 1,
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# as published by MongoDB, Inc.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# Server Side Public License for more details.
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#
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# You should have received a copy of the Server Side Public License
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# along with this program. If not, see
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# <http://www.mongodb.com/licensing/server-side-public-license>.
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#
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# As a special exception, the copyright holders give permission to link the
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# code of portions of this program with the OpenSSL library under certain
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# conditions as described in each individual source file and distribute
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# linked combinations including the program with the OpenSSL library. You
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# must comply with the Server Side Public License in all respects for
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# all of the code used other than as permitted herein. If you modify file(s)
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# with this exception, you may extend this exception to your version of the
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# file(s), but you are not obligated to do so. If you do not wish to do so,
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# delete this exception statement from your version. If you delete this
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# exception statement from all source files in the program, then also delete
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# it in the license file.
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#
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"""Manage a local mongod process for calibration."""
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import os
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import subprocess
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import time
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import pymongo
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import pymongo.errors
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from database_instance import DatabaseInstance
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class MongodManager:
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"""Start, stop, and cold-restart a local mongod."""
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def __init__(self, mongod_bin, db_config, dbpath, extra_args=None):
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self.mongod_bin = mongod_bin
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self.db_config = db_config
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self.dbpath = dbpath
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self.extra_args = extra_args or []
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self._proc = None
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self._database = None
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def __enter__(self):
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self.start()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.stop()
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@property
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def connection_string(self):
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return self.db_config.connection_string
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@property
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def database(self) -> DatabaseInstance:
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if self._database is None:
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raise RuntimeError("mongod is not running")
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return self._database
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@property
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def is_running(self):
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return self._proc is not None and self._proc.poll() is None
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def start(self):
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"""Start the mongod process."""
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if self.is_running:
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raise RuntimeError("mongod is already running")
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os.makedirs(self.dbpath, exist_ok=True)
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with open(os.path.join(self.dbpath, "mongod.log"), "a") as log_fh:
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self._proc = subprocess.Popen(
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[
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self.mongod_bin,
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"--dbpath",
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self.dbpath,
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*self.extra_args,
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],
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stdout=log_fh,
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stderr=subprocess.STDOUT,
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)
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self._wait_ready()
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self._database = DatabaseInstance(self.db_config)
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def stop(self):
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"""Shutdown mongod cleanly and release resources."""
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if not self.is_running:
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return
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try:
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client = pymongo.MongoClient(self.connection_string, serverSelectionTimeoutMS=5000)
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client.admin.command("shutdown")
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except (pymongo.errors.AutoReconnect, pymongo.errors.ServerSelectionTimeoutError):
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pass
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self._proc.wait(timeout=30)
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self._proc = None
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self._database = None
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def restart_cold(self):
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"""Stop mongod, drop OS page cache, start fresh."""
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self.stop()
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self.flush_os_cache()
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self.start()
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def flush_os_cache(self):
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"""Flush the OS page cache."""
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subprocess.run(["sync"], check=True)
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subprocess.run(
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["sudo", "sh", "-c", "echo 3 > /proc/sys/vm/drop_caches"],
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check=True,
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)
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def _wait_ready(self, timeout=60, poll_interval=0.25):
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client = pymongo.MongoClient(self.connection_string, serverSelectionTimeoutMS=500)
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deadline = time.time() + timeout
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while time.time() < deadline:
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if self._proc.poll() is not None:
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raise RuntimeError(f"mongod exited with code {self._proc.returncode}")
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try:
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client.admin.command("ping")
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return
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except pymongo.errors.ConnectionFailure:
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time.sleep(poll_interval)
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raise RuntimeError(f"mongod did not become ready in {timeout}s")
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