forked from mongodb/mongo-python-driver
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathserver.py
More file actions
232 lines (200 loc) · 7.93 KB
/
server.py
File metadata and controls
232 lines (200 loc) · 7.93 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
# 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."""
from datetime import datetime
from bson import _decode_all_selective
from pymongo.errors import NotMasterError, OperationFailure
from pymongo.helpers import _check_command_response
from pymongo.message import _convert_exception
from pymongo.response import Response, ExhaustResponse
from pymongo.server_type import SERVER_TYPE
_CURSOR_DOC_FIELDS = {'cursor': {'firstBatch': 1, 'nextBatch': 1}}
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 run_operation_with_response(
self,
sock_info,
operation,
set_slave_okay,
listeners,
exhaust,
unpack_res):
"""Run a _Query or _GetMore operation and return a Response object.
This method is used only to run _Query/_GetMore operations from
cursors.
Can raise ConnectionFailure, OperationFailure, etc.
: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`: If True, then this is an exhaust cursor operation.
- `unpack_res`: A callable that decodes the wire protocol response.
"""
duration = None
publish = listeners.enabled_for_commands
if publish:
start = datetime.now()
send_message = not operation.exhaust_mgr
if send_message:
use_cmd = operation.use_command(sock_info, exhaust)
message = operation.get_message(
set_slave_okay, sock_info, use_cmd)
request_id, data, max_doc_size = self._split_message(message)
else:
use_cmd = False
request_id = 0
if publish:
cmd, dbn = operation.as_command(sock_info)
listeners.publish_command_start(
cmd, dbn, request_id, sock_info.address)
start = datetime.now()
try:
if send_message:
sock_info.send_message(data, max_doc_size)
reply = sock_info.receive_message(request_id)
else:
reply = sock_info.receive_message(None)
# Unpack and check for command errors.
if use_cmd:
user_fields = _CURSOR_DOC_FIELDS
legacy_response = False
else:
user_fields = None
legacy_response = True
docs = unpack_res(reply, operation.cursor_id,
operation.codec_options,
legacy_response=legacy_response,
user_fields=user_fields)
if use_cmd:
first = docs[0]
operation.client._process_response(
first, operation.session)
_check_command_response(first)
except Exception as exc:
if publish:
duration = datetime.now() - start
if isinstance(exc, (NotMasterError, OperationFailure)):
failure = exc.details
else:
failure = _convert_exception(exc)
listeners.publish_command_failure(
duration, failure, operation.name,
request_id, sock_info.address)
raise
if publish:
duration = datetime.now() - start
# Must publish in find / getMore / explain command response
# format.
if use_cmd:
res = docs[0]
elif operation.name == "explain":
res = docs[0] if docs else {}
else:
res = {"cursor": {"id": reply.cursor_id,
"ns": operation.namespace()},
"ok": 1}
if operation.name == "find":
res["cursor"]["firstBatch"] = docs
else:
res["cursor"]["nextBatch"] = docs
listeners.publish_command_success(
duration, res, operation.name, request_id,
sock_info.address)
# Decrypt response.
client = operation.client
if client and client._encrypter:
if use_cmd:
decrypted = client._encrypter.decrypt(
reply.raw_command_response())
docs = _decode_all_selective(
decrypted, operation.codec_options, user_fields)
if exhaust:
response = ExhaustResponse(
data=reply,
address=self._description.address,
socket_info=sock_info,
pool=self._pool,
duration=duration,
request_id=request_id,
from_command=use_cmd,
docs=docs)
else:
response = Response(
data=reply,
address=self._description.address,
duration=duration,
request_id=request_id,
from_command=use_cmd,
docs=docs)
return response
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])