233 lines
7.9 KiB
Python
233 lines
7.9 KiB
Python
# Copyright 2014-present MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you
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# may not use this file except in compliance with the License. You
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# may obtain a copy of the License at
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#
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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
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# implied. See the License for the specific language governing
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# permissions and limitations under the License.
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"""Communicate with one MongoDB server in a topology."""
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from datetime import datetime
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from bson import _decode_all_selective
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from pymongo.errors import NotMasterError, OperationFailure
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from pymongo.helpers import _check_command_response
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from pymongo.message import _convert_exception
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from pymongo.response import Response, ExhaustResponse
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from pymongo.server_type import SERVER_TYPE
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_CURSOR_DOC_FIELDS = {'cursor': {'firstBatch': 1, 'nextBatch': 1}}
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class Server(object):
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def __init__(self, server_description, pool, monitor, topology_id=None,
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listeners=None, events=None):
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"""Represent one MongoDB server."""
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self._description = server_description
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self._pool = pool
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self._monitor = monitor
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self._topology_id = topology_id
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self._publish = listeners is not None and listeners.enabled_for_server
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self._listener = listeners
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self._events = None
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if self._publish:
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self._events = events()
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def open(self):
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"""Start monitoring, or restart after a fork.
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Multiple calls have no effect.
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"""
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self._monitor.open()
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def reset(self):
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"""Clear the connection pool."""
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self.pool.reset()
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def close(self):
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"""Clear the connection pool and stop the monitor.
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Reconnect with open().
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"""
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if self._publish:
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self._events.put((self._listener.publish_server_closed,
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(self._description.address, self._topology_id)))
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self._monitor.close()
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self._pool.reset()
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def request_check(self):
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"""Check the server's state soon."""
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self._monitor.request_check()
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def run_operation_with_response(
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self,
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sock_info,
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operation,
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set_slave_okay,
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listeners,
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exhaust,
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unpack_res):
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"""Run a _Query or _GetMore operation and return a Response object.
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This method is used only to run _Query/_GetMore operations from
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cursors.
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Can raise ConnectionFailure, OperationFailure, etc.
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:Parameters:
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- `operation`: A _Query or _GetMore object.
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- `set_slave_okay`: Pass to operation.get_message.
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- `all_credentials`: dict, maps auth source to MongoCredential.
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- `listeners`: Instance of _EventListeners or None.
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- `exhaust`: If True, then this is an exhaust cursor operation.
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- `unpack_res`: A callable that decodes the wire protocol response.
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"""
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duration = None
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publish = listeners.enabled_for_commands
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if publish:
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start = datetime.now()
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send_message = not operation.exhaust_mgr
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if send_message:
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use_cmd = operation.use_command(sock_info, exhaust)
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message = operation.get_message(
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set_slave_okay, sock_info, use_cmd)
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request_id, data, max_doc_size = self._split_message(message)
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else:
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use_cmd = False
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request_id = 0
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if publish:
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cmd, dbn = operation.as_command(sock_info)
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listeners.publish_command_start(
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cmd, dbn, request_id, sock_info.address)
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start = datetime.now()
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try:
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if send_message:
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sock_info.send_message(data, max_doc_size)
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reply = sock_info.receive_message(request_id)
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else:
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reply = sock_info.receive_message(None)
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# Unpack and check for command errors.
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if use_cmd:
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user_fields = _CURSOR_DOC_FIELDS
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legacy_response = False
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else:
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user_fields = None
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legacy_response = True
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docs = unpack_res(reply, operation.cursor_id,
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operation.codec_options,
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legacy_response=legacy_response,
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user_fields=user_fields)
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if use_cmd:
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first = docs[0]
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operation.client._process_response(
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first, operation.session)
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_check_command_response(first)
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except Exception as exc:
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if publish:
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duration = datetime.now() - start
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if isinstance(exc, (NotMasterError, OperationFailure)):
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failure = exc.details
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else:
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failure = _convert_exception(exc)
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listeners.publish_command_failure(
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duration, failure, operation.name,
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request_id, sock_info.address)
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raise
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if publish:
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duration = datetime.now() - start
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# Must publish in find / getMore / explain command response
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# format.
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if use_cmd:
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res = docs[0]
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elif operation.name == "explain":
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res = docs[0] if docs else {}
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else:
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res = {"cursor": {"id": reply.cursor_id,
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"ns": operation.namespace()},
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"ok": 1}
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if operation.name == "find":
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res["cursor"]["firstBatch"] = docs
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else:
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res["cursor"]["nextBatch"] = docs
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listeners.publish_command_success(
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duration, res, operation.name, request_id,
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sock_info.address)
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# Decrypt response.
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client = operation.client
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if client and client._encrypter:
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if use_cmd:
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decrypted = client._encrypter.decrypt(
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reply.raw_command_response())
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docs = _decode_all_selective(
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decrypted, operation.codec_options, user_fields)
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if exhaust:
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response = ExhaustResponse(
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data=reply,
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address=self._description.address,
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socket_info=sock_info,
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pool=self._pool,
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duration=duration,
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request_id=request_id,
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from_command=use_cmd,
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docs=docs)
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else:
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response = Response(
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data=reply,
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address=self._description.address,
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duration=duration,
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request_id=request_id,
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from_command=use_cmd,
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docs=docs)
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return response
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def get_socket(self, all_credentials, checkout=False):
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return self.pool.get_socket(all_credentials, checkout)
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@property
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def description(self):
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return self._description
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@description.setter
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def description(self, server_description):
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assert server_description.address == self._description.address
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self._description = server_description
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@property
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def pool(self):
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return self._pool
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def _split_message(self, message):
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"""Return request_id, data, max_doc_size.
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:Parameters:
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- `message`: (request_id, data, max_doc_size) or (request_id, data)
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"""
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if len(message) == 3:
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return message
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else:
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# get_more and kill_cursors messages don't include BSON documents.
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request_id, data = message
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return request_id, data, 0
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def __str__(self):
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d = self._description
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return '<Server "%s:%s" %s>' % (
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d.address[0], d.address[1],
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SERVER_TYPE._fields[d.server_type])
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