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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
/* Client represents a connection to the database (the server-side) and corresponds
to an open socket (or logical connection if pooling on sockets) from a client.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/client.h"
#include <boost/functional/hash.hpp>
#include <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/concurrency/thread_name.h"
#include "mongo/util/exit.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
thread_local ServiceContext::UniqueClient currentClient;
void invariantNoCurrentClient() {
invariant(!haveClient(),
str::stream() << "Already have client on this thread: " //
<< '"' << Client::getCurrent()->desc() << '"');
}
} // namespace
void Client::initThread(StringData desc, transport::SessionHandle session) {
initThread(desc, getGlobalServiceContext(), std::move(session));
}
void Client::initThread(StringData desc,
ServiceContext* service,
transport::SessionHandle session) {
invariantNoCurrentClient();
std::string fullDesc;
if (session) {
fullDesc = str::stream() << desc << session->id();
} else {
fullDesc = desc.toString();
}
setThreadName(fullDesc);
// Create the client obj, attach to thread
currentClient = service->makeClient(fullDesc, std::move(session));
}
namespace {
int64_t generateSeed(const std::string& desc) {
size_t seed = 0;
boost::hash_combine(seed, Date_t::now().asInt64());
boost::hash_combine(seed, desc);
return seed;
}
} // namespace
Client::Client(std::string desc, ServiceContext* serviceContext, transport::SessionHandle session)
: _serviceContext(serviceContext),
_session(std::move(session)),
_desc(std::move(desc)),
_connectionId(_session ? _session->id() : 0),
_prng(generateSeed(_desc)) {}
void Client::reportState(BSONObjBuilder& builder) {
builder.append("desc", desc());
if (_connectionId) {
builder.appendNumber("connectionId", _connectionId);
}
if (hasRemote()) {
builder.append("client", getRemote().toString());
}
}
ServiceContext::UniqueOperationContext Client::makeOperationContext() {
return getServiceContext()->makeOperationContext(this);
}
void Client::setOperationContext(OperationContext* opCtx) {
// We can only set the OperationContext once before resetting it.
invariant(opCtx != nullptr && _opCtx == nullptr);
_opCtx = opCtx;
}
void Client::resetOperationContext() {
invariant(_opCtx != nullptr);
_opCtx = nullptr;
}
std::string Client::clientAddress(bool includePort) const {
if (!hasRemote()) {
return "";
}
if (includePort) {
return getRemote().toString();
}
return getRemote().host();
}
Client* Client::getCurrent() {
return currentClient.get();
}
std::unique_ptr<Locker> Client::swapLockState(std::unique_ptr<Locker> locker) {
scoped_spinlock scopedLock(_lock);
invariant(_opCtx);
return _opCtx->swapLockState(std::move(locker), scopedLock);
}
Client& cc() {
invariant(haveClient());
return *Client::getCurrent();
}
bool haveClient() {
return static_cast<bool>(currentClient);
}
ServiceContext::UniqueClient Client::releaseCurrent() {
invariant(haveClient());
return std::move(currentClient);
}
void Client::setCurrent(ServiceContext::UniqueClient client) {
invariantNoCurrentClient();
currentClient = std::move(client);
}
/**
* User connections are listed active so long as they are associated with an opCtx.
* Non-user connections are listed active if they have an opCtx and not waiting on a condvar.
*/
bool Client::hasAnyActiveCurrentOp() const {
if (!_opCtx)
return false;
if (isFromUserConnection() || !_opCtx->isWaitingForConditionOrInterrupt())
return true;
return false;
}
void Client::setKilled() noexcept {
stdx::lock_guard<Client> lk(*this);
_killed.store(true);
if (_opCtx) {
_serviceContext->killOperation(lk, _opCtx, ErrorCodes::ClientMarkedKilled);
}
}
ThreadClient::ThreadClient(ServiceContext* serviceContext)
: ThreadClient(getThreadName(), serviceContext, nullptr) {}
ThreadClient::ThreadClient(StringData desc,
ServiceContext* serviceContext,
transport::SessionHandle session) {
invariantNoCurrentClient();
Client::initThread(desc, serviceContext, std::move(session));
}
ThreadClient::~ThreadClient() {
invariant(currentClient);
currentClient.reset(nullptr);
}
Client* ThreadClient::get() const {
return &cc();
}
} // namespace mongo
|
