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server.py
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# Copyright 2014-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License. You
# may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
"""Communicate with one MongoDB server in a topology."""
import contextlib
from datetime import datetime
from pymongo.message import _convert_exception
from pymongo.response import Response, ExhaustResponse
from pymongo.server_type import SERVER_TYPE
class Server(object):
def __init__(self, server_description, pool, monitor, topology_id=None,
listeners=None, events=None):
"""Represent one MongoDB server."""
self._description = server_description
self._pool = pool
self._monitor = monitor
self._topology_id = topology_id
self._publish = listeners is not None and listeners.enabled_for_server
self._listener = listeners
self._events = None
if self._publish:
self._events = events()
def open(self):
"""Start monitoring, or restart after a fork.
Multiple calls have no effect.
"""
self._monitor.open()
def reset(self):
"""Clear the connection pool."""
self.pool.reset()
def close(self):
"""Clear the connection pool and stop the monitor.
Reconnect with open().
"""
if self._publish:
self._events.put((self._listener.publish_server_closed,
(self._description.address, self._topology_id)))
self._monitor.close()
self._pool.reset()
def request_check(self):
"""Check the server's state soon."""
self._monitor.request_check()
def send_message_with_response(
self,
operation,
set_slave_okay,
all_credentials,
listeners,
exhaust=False):
"""Send a message to MongoDB and return a Response object.
Can raise ConnectionFailure.
:Parameters:
- `operation`: A _Query or _GetMore object.
- `set_slave_okay`: Pass to operation.get_message.
- `all_credentials`: dict, maps auth source to MongoCredential.
- `listeners`: Instance of _EventListeners or None.
- `exhaust` (optional): If True, the socket used stays checked out.
It is returned along with its Pool in the Response.
"""
with self.get_socket(all_credentials, exhaust) as sock_info:
duration = None
publish = listeners.enabled_for_commands
if publish:
start = datetime.now()
use_find_cmd = operation.use_command(sock_info, exhaust)
message = operation.get_message(
set_slave_okay, sock_info, use_find_cmd)
request_id, data, max_doc_size = self._split_message(message)
if publish:
encoding_duration = datetime.now() - start
cmd, dbn = operation.as_command(sock_info)
listeners.publish_command_start(
cmd, dbn, request_id, sock_info.address)
start = datetime.now()
try:
sock_info.send_message(data, max_doc_size)
reply = sock_info.receive_message(request_id)
except Exception as exc:
if publish:
duration = (datetime.now() - start) + encoding_duration
failure = _convert_exception(exc)
listeners.publish_command_failure(
duration, failure, next(iter(cmd)), request_id,
sock_info.address)
raise
if publish:
duration = (datetime.now() - start) + encoding_duration
if exhaust:
return ExhaustResponse(
data=reply,
address=self._description.address,
socket_info=sock_info,
pool=self._pool,
duration=duration,
request_id=request_id,
from_command=use_find_cmd)
else:
return Response(
data=reply,
address=self._description.address,
duration=duration,
request_id=request_id,
from_command=use_find_cmd)
def get_socket(self, all_credentials, checkout=False):
return self.pool.get_socket(all_credentials, checkout)
@property
def description(self):
return self._description
@description.setter
def description(self, server_description):
assert server_description.address == self._description.address
self._description = server_description
@property
def pool(self):
return self._pool
def _split_message(self, message):
"""Return request_id, data, max_doc_size.
:Parameters:
- `message`: (request_id, data, max_doc_size) or (request_id, data)
"""
if len(message) == 3:
return message
else:
# get_more and kill_cursors messages don't include BSON documents.
request_id, data = message
return request_id, data, 0
def __str__(self):
d = self._description
return '<Server "%s:%s" %s>' % (
d.address[0], d.address[1],
SERVER_TYPE._fields[d.server_type])