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
|
/**
* Copyright (C) 2020-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.
*/
#include "mongo/client/mongo_uri.h"
#include "mongo/client/sdam/sdam.h"
#include "mongo/executor/task_executor.h"
#include "mongo/stdx/unordered_map.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
using namespace sdam;
class SingleServerIsMasterMonitor
: public std::enable_shared_from_this<SingleServerIsMasterMonitor> {
public:
explicit SingleServerIsMasterMonitor(const MongoURI& setUri,
const ServerAddress& host,
Milliseconds heartbeatFrequencyMS,
TopologyEventsPublisherPtr eventListener,
std::shared_ptr<executor::TaskExecutor> executor);
void init();
void shutdown();
/**
* Request an immediate check. The server will be checked immediately if we haven't completed
* an isMaster less than SdamConfiguration::kMinHeartbeatFrequencyMS ago. Otherwise,
* we schedule a check that runs after SdamConfiguration::kMinHeartbeatFrequencyMS since
* the last isMaster.
*/
void requestImmediateCheck();
void disableExpeditedChecking();
private:
void _scheduleNextIsMaster(WithLock, Milliseconds delay);
void _doRemoteCommand();
void _onIsMasterSuccess(IsMasterRTT latency, const BSONObj bson);
void _onIsMasterFailure(IsMasterRTT latency, const Status& status, const BSONObj bson);
Milliseconds _overrideRefreshPeriod(Milliseconds original);
Milliseconds _currentRefreshPeriod(WithLock);
void _cancelOutstandingRequest(WithLock);
static inline const logger::LogSeverity kLogLevel = logger::LogSeverity::Debug(1);
Mutex _mutex;
ServerAddress _host;
TopologyEventsPublisherPtr _eventListener;
std::shared_ptr<executor::TaskExecutor> _executor;
Milliseconds _heartbeatFrequencyMS;
Milliseconds _timeoutMS = SdamConfiguration::kDefaultConnectTimeoutMS;
boost::optional<Date_t> _lastIsMasterAt;
bool _isMasterOutstanding = false;
bool _isExpedited = false;
executor::TaskExecutor::CallbackHandle _nextIsMasterHandle;
executor::TaskExecutor::CallbackHandle _remoteCommandHandle;
bool _isShutdown;
MongoURI _setUri;
};
using SingleServerIsMasterMonitorPtr = std::shared_ptr<SingleServerIsMasterMonitor>;
class ServerIsMasterMonitor : public TopologyListener {
public:
ServerIsMasterMonitor(const MongoURI& setUri,
const SdamConfiguration& sdamConfiguration,
TopologyEventsPublisherPtr eventsPublisher,
TopologyDescriptionPtr initialTopologyDescription,
std::shared_ptr<executor::TaskExecutor> executor = nullptr);
virtual ~ServerIsMasterMonitor() {}
void shutdown();
/**
* Request an immediate check of each member in the replica set.
*/
void requestImmediateCheck();
/**
* Add/Remove Single Monitors based on the current topology membership.
*/
void onTopologyDescriptionChangedEvent(UUID topologyId,
TopologyDescriptionPtr previousDescription,
TopologyDescriptionPtr newDescription) override;
private:
/**
* If the provided executor exists, use that one (for testing). Otherwise create a new one.
*/
std::shared_ptr<executor::TaskExecutor> _setupExecutor(
const std::shared_ptr<executor::TaskExecutor>& executor);
void _disableExpeditedChecking(WithLock);
static inline const logger::LogSeverity kLogLevel = logger::LogSeverity::Debug(0);
Mutex _mutex;
SdamConfiguration _sdamConfiguration;
TopologyEventsPublisherPtr _eventPublisher;
std::shared_ptr<executor::TaskExecutor> _executor;
std::unordered_map<ServerAddress, SingleServerIsMasterMonitorPtr> _singleMonitors;
bool _isShutdown;
MongoURI _setUri;
};
using ServerIsMasterMonitorPtr = std::shared_ptr<ServerIsMasterMonitor>;
} // namespace mongo
|
