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
|
/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/dbdirectclient.h"
#include <boost/core/swap.hpp>
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/curop.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/wire_version.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/transport/service_entry_point.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::unique_ptr;
using std::string;
namespace {
class DirectClientScope {
MONGO_DISALLOW_COPYING(DirectClientScope);
public:
explicit DirectClientScope(OperationContext* opCtx)
: _opCtx(opCtx), _prev(_opCtx->getClient()->isInDirectClient()) {
_opCtx->getClient()->setInDirectClient(true);
}
~DirectClientScope() {
_opCtx->getClient()->setInDirectClient(_prev);
}
private:
OperationContext* const _opCtx;
const bool _prev;
};
} // namespace
DBDirectClient::DBDirectClient(OperationContext* opCtx) : _opCtx(opCtx) {
_setServerRPCProtocols(rpc::supports::kAll);
}
bool DBDirectClient::isFailed() const {
return false;
}
bool DBDirectClient::isStillConnected() {
return true;
}
std::string DBDirectClient::toString() const {
return "DBDirectClient";
}
std::string DBDirectClient::getServerAddress() const {
return "localhost"; // TODO: should this have the port?
}
// Returned version should match the incoming connections restrictions.
int DBDirectClient::getMinWireVersion() {
return WireSpec::instance().incomingExternalClient.minWireVersion;
}
// Returned version should match the incoming connections restrictions.
int DBDirectClient::getMaxWireVersion() {
return WireSpec::instance().incomingExternalClient.maxWireVersion;
}
bool DBDirectClient::isReplicaSetMember() const {
auto const* replCoord = repl::ReplicationCoordinator::get(_opCtx);
return replCoord && replCoord->isReplEnabled();
}
ConnectionString::ConnectionType DBDirectClient::type() const {
return ConnectionString::MASTER;
}
double DBDirectClient::getSoTimeout() const {
return 0;
}
bool DBDirectClient::lazySupported() const {
return true;
}
void DBDirectClient::setOpCtx(OperationContext* opCtx) {
_opCtx = opCtx;
}
QueryOptions DBDirectClient::_lookupAvailableOptions() {
// Exhaust mode is not available in DBDirectClient.
return QueryOptions(DBClientBase::_lookupAvailableOptions() & ~QueryOption_Exhaust);
}
namespace {
DbResponse loopbackBuildResponse(OperationContext* const opCtx,
LastError* lastError,
Message& toSend) {
DirectClientScope directClientScope(opCtx);
boost::swap(*lastError, LastError::get(opCtx->getClient()));
ON_BLOCK_EXIT([&] { boost::swap(*lastError, LastError::get(opCtx->getClient())); });
LastError::get(opCtx->getClient()).startRequest();
CurOp curOp(opCtx);
toSend.header().setId(nextMessageId());
toSend.header().setResponseToMsgId(0);
return opCtx->getServiceContext()->getServiceEntryPoint()->handleRequest(opCtx, toSend);
}
} // namespace
bool DBDirectClient::call(Message& toSend, Message& response, bool assertOk, string* actualServer) {
auto dbResponse = loopbackBuildResponse(_opCtx, &_lastError, toSend);
invariant(!dbResponse.response.empty());
response = std::move(dbResponse.response);
return true;
}
void DBDirectClient::say(Message& toSend, bool isRetry, string* actualServer) {
auto dbResponse = loopbackBuildResponse(_opCtx, &_lastError, toSend);
invariant(dbResponse.response.empty());
}
unique_ptr<DBClientCursor> DBDirectClient::query(const string& ns,
Query query,
int nToReturn,
int nToSkip,
const BSONObj* fieldsToReturn,
int queryOptions,
int batchSize) {
return DBClientBase::query(
ns, query, nToReturn, nToSkip, fieldsToReturn, queryOptions, batchSize);
}
unsigned long long DBDirectClient::count(
const string& ns, const BSONObj& query, int options, int limit, int skip) {
BSONObj cmdObj = _countCmd(ns, query, options, limit, skip);
NamespaceString nsString(ns);
auto result = Command::runCommandDirectly(
_opCtx, OpMsgRequest::fromDBAndBody(nsString.db(), std::move(cmdObj)));
uassertStatusOK(getStatusFromCommandResult(result));
return static_cast<unsigned long long>(result["n"].numberLong());
}
} // namespace mongo
|
