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
|
/**
* 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.
*/
#pragma once
#include <functional>
#include <memory>
#include <set>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/client/mongo_uri.h"
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/client/sdam/sdam.h"
#include "mongo/client/server_is_master_monitor.h"
#include "mongo/client/server_ping_monitor.h"
#include "mongo/executor/task_executor.h"
#include "mongo/logger/log_component.h"
#include "mongo/util/concurrency/with_lock.h"
#include "mongo/util/duration.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/time_support.h"
namespace mongo {
class BSONObj;
class ReplicaSetMonitor;
class ReplicaSetMonitorTest;
struct ReadPreferenceSetting;
using ReplicaSetMonitorPtr = std::shared_ptr<ReplicaSetMonitor>;
/**
* Replica set monitor implementation backed by the classes in the mongo::sdam namespace.
*
* All methods perform the required synchronization to allow callers from multiple threads.
*/
class StreamableReplicaSetMonitor
: public ReplicaSetMonitor,
public sdam::TopologyListener,
public std::enable_shared_from_this<StreamableReplicaSetMonitor> {
StreamableReplicaSetMonitor(const ReplicaSetMonitor&) = delete;
StreamableReplicaSetMonitor& operator=(const ReplicaSetMonitor&) = delete;
public:
class Refresher;
static constexpr auto kExpeditedRefreshPeriod = Milliseconds(500);
static constexpr auto kCheckTimeout = Seconds(5);
StreamableReplicaSetMonitor(const MongoURI& uri,
std::shared_ptr<executor::TaskExecutor> executor);
void init();
void drop();
static ReplicaSetMonitorPtr make(const MongoURI& uri,
std::shared_ptr<executor::TaskExecutor> executor = nullptr);
SemiFuture<HostAndPort> getHostOrRefresh(const ReadPreferenceSetting& readPref,
Milliseconds maxWait = kDefaultFindHostTimeout);
SemiFuture<std::vector<HostAndPort>> getHostsOrRefresh(
const ReadPreferenceSetting& readPref, Milliseconds maxWait = kDefaultFindHostTimeout);
HostAndPort getMasterOrUassert();
void failedHost(const HostAndPort& host, const Status& status);
void failedHost(const HostAndPort& host, BSONObj bson, const Status& status);
bool isPrimary(const HostAndPort& host) const;
bool isHostUp(const HostAndPort& host) const;
int getMinWireVersion() const;
int getMaxWireVersion() const;
std::string getName() const;
std::string getServerAddress() const;
const MongoURI& getOriginalUri() const;
sdam::TopologyEventsPublisherPtr getEventsPublisher();
bool contains(const HostAndPort& server) const;
void appendInfo(BSONObjBuilder& b, bool forFTDC = false) const;
bool isKnownToHaveGoodPrimary() const;
void runScanForMockReplicaSet() override;
private:
class StreamableReplicaSetMonitorQueryProcessor;
using StreamableReplicaSetMontiorQueryProcessorPtr =
std::shared_ptr<StreamableReplicaSetMonitor::StreamableReplicaSetMonitorQueryProcessor>;
struct HostQuery {
Date_t deadline;
executor::TaskExecutor::CallbackHandle deadlineHandle;
ReadPreferenceSetting criteria;
Date_t start = Date_t::now();
bool done = false;
Promise<std::vector<HostAndPort>> promise;
};
using HostQueryPtr = std::shared_ptr<HostQuery>;
// Information collected from the primary ServerDescription to be published via the
// ReplicaSetChangeNotifier
struct ChangeNotifierState {
HostAndPort primaryAddress;
std::set<HostAndPort> passives;
ConnectionString connectionString;
};
SemiFuture<std::vector<HostAndPort>> _enqueueOutstandingQuery(
WithLock, const ReadPreferenceSetting& criteria, const Date_t& deadline);
std::vector<HostAndPort> _extractHosts(
const std::vector<sdam::ServerDescriptionPtr>& serverDescriptions);
boost::optional<std::vector<HostAndPort>> _getHosts(const TopologyDescriptionPtr& topology,
const ReadPreferenceSetting& criteria);
boost::optional<std::vector<HostAndPort>> _getHosts(const ReadPreferenceSetting& criteria);
void onTopologyDescriptionChangedEvent(UUID topologyId,
sdam::TopologyDescriptionPtr previousDescription,
sdam::TopologyDescriptionPtr newDescription) override;
void onServerHeartbeatSucceededEvent(sdam::IsMasterRTT durationMs,
const sdam::ServerAddress& hostAndPort,
const BSONObj reply) override;
void onServerHeartbeatFailureEvent(IsMasterRTT durationMs,
Status errorStatus,
const ServerAddress& hostAndPort,
const BSONObj reply) override;
void onServerPingFailedEvent(const sdam::ServerAddress& hostAndPort,
const Status& status) override;
void onServerPingSucceededEvent(sdam::IsMasterRTT durationMS,
const sdam::ServerAddress& hostAndPort) override;
void onServerHandshakeCompleteEvent(sdam::IsMasterRTT durationMs,
const ServerAddress& hostAndPort,
const BSONObj reply) override;
// Get a pointer to the current primary's ServerDescription
// To ensure a consistent view of the Topology either _currentPrimary or _currentTopology should
// be called (not both) since the topology can change between the function invocations.
boost::optional<sdam::ServerDescriptionPtr> _currentPrimary() const;
// Get the current TopologyDescription
// Note that most functions will want to save the result of this function once per computation
// so that we are operating on a consistent read-only view of the topology.
sdam::TopologyDescriptionPtr _currentTopology() const;
std::string _logPrefix();
void _failOutstandingWithStatus(WithLock, Status status);
bool _hasMembershipChange(sdam::TopologyDescriptionPtr oldDescription,
sdam::TopologyDescriptionPtr newDescription);
void _setConfirmedNotifierState(WithLock, const ServerDescriptionPtr& primaryDescription);
Status _makeUnsatisfiedReadPrefError(const ReadPreferenceSetting& criteria) const;
Status _makeReplicaSetMonitorRemovedError() const;
// Try to satisfy the outstanding queries for this instance with the given topology information.
void _processOutstanding(const TopologyDescriptionPtr& topologyDescription);
sdam::SdamConfiguration _sdamConfig;
sdam::TopologyManagerPtr _topologyManager;
sdam::ServerSelectorPtr _serverSelector;
sdam::TopologyEventsPublisherPtr _eventsPublisher;
ServerIsMasterMonitorPtr _isMasterMonitor;
std::shared_ptr<ServerPingMonitor> _pingMonitor;
// This object will be registered as a TopologyListener if there are
// any outstanding queries for this RSM instance.
StreamableReplicaSetMontiorQueryProcessorPtr _queryProcessor;
const MongoURI _uri;
std::shared_ptr<executor::TaskExecutor> _executor;
AtomicWord<bool> _isDropped{true};
mutable Mutex _mutex = MONGO_MAKE_LATCH("ReplicaSetMonitor");
std::vector<HostQueryPtr> _outstandingQueries;
boost::optional<ChangeNotifierState> _confirmedNotifierState;
mutable PseudoRandom _random;
static inline const auto kServerSelectionConfig =
sdam::ServerSelectionConfiguration::defaultConfiguration();
static constexpr auto kDefaultLogLevel = 0;
static constexpr auto kLowerLogLevel = 1;
static constexpr auto kLogPrefix = "[ReplicaSetMonitor]";
};
} // namespace mongo
|
