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
|
/**
* Copyright (C) 2019-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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/watchdog/watchdog_mongod.h"
#include <boost/filesystem.hpp>
#include <memory>
#include "mongo/base/init.h"
#include "mongo/config.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/server_options.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_options.h"
#include "mongo/logv2/log.h"
#include "mongo/util/clock_source.h"
#include "mongo/util/clock_source_mock.h"
#include "mongo/util/tick_source_mock.h"
#include "mongo/watchdog/watchdog.h"
#include "mongo/watchdog/watchdog_mongod_gen.h"
#include "mongo/watchdog/watchdog_register.h"
namespace mongo {
namespace {
// Run the watchdog checks at a fixed interval regardless of user choice for monitoring period.
constexpr Seconds watchdogCheckPeriod = Seconds{10};
const auto getWatchdogMonitor =
ServiceContext::declareDecoration<std::unique_ptr<WatchdogMonitor>>();
// A boolean variable to track whether the watchdog was enabled at startup.
// Defaults to true because set parameters are handled before we start the watchdog if needed.
bool watchdogEnabled{true};
WatchdogMonitor* getGlobalWatchdogMonitor() {
if (!hasGlobalServiceContext()) {
return nullptr;
}
return getWatchdogMonitor(getGlobalServiceContext()).get();
}
} // namespace
Status validateWatchdogPeriodSeconds(const int& value) {
if (value < 60 && value != -1) {
return {ErrorCodes::BadValue, "watchdogPeriodSeconds must be greater than or equal to 60s"};
}
// If the watchdog was not enabled at startup, disallow changes the period.
if (!watchdogEnabled) {
return {ErrorCodes::BadValue,
"watchdogPeriodSeconds cannot be changed at runtime if it was not set at startup"};
}
return Status::OK();
}
Status onUpdateWatchdogPeriodSeconds(const int& value) {
auto monitor = getGlobalWatchdogMonitor();
if (monitor) {
monitor->setPeriod(Seconds(value));
}
return Status::OK();
}
/**
* Server status section for the Watchdog.
*
* Sample format:
*
* watchdog: {
* generation: int,
* }
*/
class WatchdogServerStatusSection : public ServerStatusSection {
public:
WatchdogServerStatusSection() : ServerStatusSection("watchdog") {}
bool includeByDefault() const {
// Only include this by default if the watchdog is on
return watchdogEnabled;
}
BSONObj generateSection(OperationContext* opCtx, const BSONElement& configElement) const {
if (!watchdogEnabled) {
return BSONObj();
}
BSONObjBuilder result;
WatchdogMonitor* watchdog = getWatchdogMonitor(opCtx->getServiceContext()).get();
invariant(watchdog);
result.append("checkGeneration", watchdog->getCheckGeneration());
result.append("monitorGeneration", watchdog->getMonitorGeneration());
result.append("monitorPeriod", gWatchdogPeriodSeconds.load());
return result.obj();
}
} watchdogServerStatusSection;
void startWatchdog(ServiceContext* service) {
// Check three paths if set
// 1. storage directory - optional for inmemory?
// 2. log path - optional
// 3. audit path - optional
Seconds period{gWatchdogPeriodSeconds.load()};
if (period < Seconds::zero()) {
// Skip starting the watchdog if the user has not asked for it.
watchdogEnabled = false;
return;
}
watchdogEnabled = true;
std::vector<std::unique_ptr<WatchdogCheck>> checks;
auto dataCheck =
std::make_unique<DirectoryCheck>(boost::filesystem::path(storageGlobalParams.dbpath));
checks.push_back(std::move(dataCheck));
// Add a check for the journal if it is not disabled
if (storageGlobalParams.dur) {
auto journalDirectory = boost::filesystem::path(storageGlobalParams.dbpath);
journalDirectory /= "journal";
if (boost::filesystem::exists(journalDirectory)) {
auto journalCheck = std::make_unique<DirectoryCheck>(journalDirectory);
checks.push_back(std::move(journalCheck));
} else {
LOGV2_WARNING(23835,
"Watchdog is skipping check for journal directory since it does not "
"exist: '{journalDirectory_generic_string}'",
"journalDirectory_generic_string"_attr =
journalDirectory.generic_string());
}
}
// If the user specified a log path, also monitor that directory.
// This may be redudant with the dbpath check but there is not easy way to confirm they are
// duplicate.
if (!serverGlobalParams.logpath.empty()) {
boost::filesystem::path logFile(serverGlobalParams.logpath);
auto logPath = logFile.parent_path();
auto logCheck = std::make_unique<DirectoryCheck>(logPath);
checks.push_back(std::move(logCheck));
}
// If the user specified an audit path, also monitor that directory.
// This may be redudant with the dbpath check but there is not easy way to confirm they are
// duplicate.
for (auto&& path : getWatchdogPaths()) {
auto auditCheck = std::make_unique<DirectoryCheck>(path);
checks.push_back(std::move(auditCheck));
}
auto monitor = std::make_unique<WatchdogMonitor>(
std::move(checks), watchdogCheckPeriod, period, watchdogTerminate);
// Install the new WatchdogMonitor
auto& staticMonitor = getWatchdogMonitor(service);
staticMonitor = std::move(monitor);
staticMonitor->start();
}
} // namespace mongo
|
