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
|
/**
* Copyright (C) 2015 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.
*/
#pragma once
#include <list>
#include <string>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/client/fetcher.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/collection_cloner.h"
#include "mongo/db/repl/base_cloner.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
namespace repl {
class DatabaseCloner : public BaseCloner {
MONGO_DISALLOW_COPYING(DatabaseCloner);
public:
/**
* Predicate used on the collection info objects returned by listCollections.
* Each collection info is represented by a document in the following format:
* {
* name: <collection name>,
* options: <collection options>
* }
*
* Returns true if the collection described by the info object should be cloned.
* Returns false if the collection should be ignored.
*/
using ListCollectionsPredicateFn = stdx::function<bool (const BSONObj&)>;
/**
* Callback function to report progress of collection cloning. Arguments are:
* - status from the collection cloner's 'onCompletion' callback.
* - source namespace of the collection cloner that completed (or failed).
*
* Called exactly once for every collection cloner started by the the database cloner.
*/
using CollectionCallbackFn = stdx::function<void (const Status&, const NamespaceString&)>;
/**
* Type of function to start a collection cloner.
*/
using StartCollectionClonerFn = stdx::function<Status (CollectionCloner&)>;
/**
* Creates DatabaseCloner task in inactive state. Use start() to activate cloner.
*
* The cloner calls 'onCompletion' when the database cloning has completed or failed.
*
* 'onCompletion' will be called exactly once.
*
* Takes ownership of the passed StorageInterface object.
*/
DatabaseCloner(ReplicationExecutor* executor,
const HostAndPort& source,
const std::string& dbname,
const BSONObj& listCollectionsFilter,
const ListCollectionsPredicateFn& listCollectionsPredicate,
CollectionCloner::StorageInterface* storageInterface,
const CollectionCallbackFn& collectionWork,
const CallbackFn& onCompletion);
virtual ~DatabaseCloner();
/**
* Returns collection info objects read from listCollections result.
* This will return an empty vector until we have processed the last
* batch of results from listCollections.
*/
const std::vector<BSONObj>& getCollectionInfos() const;
std::string getDiagnosticString() const override;
bool isActive() const override;
Status start() override;
void cancel() override;
void wait() override;
//
// Testing only functions below.
//
/**
* Overrides how executor schedules database work.
*
* For testing only.
*/
void setScheduleDbWorkFn(const CollectionCloner::ScheduleDbWorkFn& scheduleDbWorkFn);
/**
* Overrides how executor starts a collection cloner.
*
* For testing only
*/
void setStartCollectionClonerFn(const StartCollectionClonerFn& startCollectionCloner);
private:
/**
* Read collection names and options from listCollections result.
*/
void _listCollectionsCallback(const StatusWith<Fetcher::QueryResponse>& fetchResult,
Fetcher::NextAction* nextAction,
BSONObjBuilder* getMoreBob);
/**
* Forwards collection cloner result to client.
* Starts a new cloner on a different collection.
*/
void _collectionClonerCallback(const Status& status, const NamespaceString& nss);
/**
* Reports completion status.
* Sets cloner to inactive.
*/
void _finishCallback(const Status& status);
// Not owned by us.
ReplicationExecutor* _executor;
HostAndPort _source;
std::string _dbname;
BSONObj _listCollectionsFilter;
ListCollectionsPredicateFn _listCollectionsPredicate;
CollectionCloner::StorageInterface* _storageInterface;
// Invoked once for every successfully started collection cloner.
CollectionCallbackFn _collectionWork;
// Invoked once when cloning completes or fails.
CallbackFn _onCompletion;
// Protects member data of this database cloner.
mutable stdx::mutex _mutex;
mutable stdx::condition_variable _condition;
// _active is true when database cloner is started.
bool _active;
// Fetcher instance for running listCollections command.
Fetcher _listCollectionsFetcher;
// Collection info objects returned from listCollections.
// Format of each document:
// {
// name: <collection name>,
// options: <collection options>
// }
// Holds all collection infos from listCollections.
std::vector<BSONObj> _collectionInfos;
std::vector<NamespaceString> _collectionNamespaces;
std::list<CollectionCloner> _collectionCloners;
std::list<CollectionCloner>::iterator _currentCollectionClonerIter;
// Function for scheduling database work using the executor.
CollectionCloner::ScheduleDbWorkFn _scheduleDbWorkFn;
StartCollectionClonerFn _startCollectionCloner;
};
} // namespace repl
} // namespace mongo
|
