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
|
/**
* Copyright (C) 2018-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
/**
* copy a database (export/import basically)
*/
#include <string>
#include <vector>
#include "mongo/client/connpool.h"
#include "mongo/client/dbclient_base.h"
namespace mongo {
class DBClientBase;
class NamespaceString;
class OperationContext;
class ClonerImpl {
public:
virtual ~ClonerImpl() = default;
virtual Status copyDb(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost,
const std::vector<NamespaceString>& shardedColls,
std::set<std::string>* clonedColls) = 0;
virtual Status setupConn(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost) = 0;
virtual StatusWith<std::vector<BSONObj>> getListOfCollections(
OperationContext* opCtx, const std::string& dBName, const std::string& masterHost) = 0;
};
class DefaultClonerImpl : public ClonerImpl {
public:
/**
* Copies an entire database from the specified host.
* clonedColls: the function will return with this populated with a list of the collections that
* were cloned.
* collectionsToClone: When opts.createCollections is false, this list reflects the collections
* that are cloned. When opts.createCollections is true, this parameter is
* ignored and the collection list is fetched from the remote via _conn.
*/
Status copyDb(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost,
const std::vector<NamespaceString>& shardedColls,
std::set<std::string>* clonedColls) override;
Status setupConn(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost) override;
StatusWith<std::vector<BSONObj>> getListOfCollections(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost) override;
private:
std::unique_ptr<ScopedDbConnection> _conn;
// Filters a database's collection list and removes collections that should not be cloned.
StatusWith<std::vector<BSONObj>> _filterCollectionsForClone(
const std::string& fromDBName, const std::list<BSONObj>& initialCollections);
struct CreateCollectionParams {
std::string collectionName;
BSONObj collectionInfo;
BSONObj idIndexSpec;
bool shardedColl = false;
};
// Executes 'createCollection' for each collection described in 'createCollectionParams', in
// 'dbName'.
Status _createCollectionsForDb(
OperationContext* opCtx,
const std::vector<CreateCollectionParams>& createCollectionParams,
const std::string& dbName);
/*
* Returns the _id index spec from 'indexSpecs', or an empty BSONObj if none is found.
*/
static BSONObj _getIdIndexSpec(const std::list<BSONObj>& indexSpecs);
void _copy(OperationContext* opCtx,
const std::string& toDBName,
const NamespaceString& nss,
const BSONObj& from_opts,
const BSONObj& from_id_index);
void _copyIndexes(OperationContext* opCtx,
const std::string& toDBName,
const NamespaceString& nss,
const BSONObj& from_opts,
const std::list<BSONObj>& from_indexes);
struct BatchHandler;
DBClientBase* getConn() {
return _conn->get();
}
};
class Cloner {
public:
Cloner(std::unique_ptr<ClonerImpl> clonerImpl) : _clonerImpl(std::move(clonerImpl)) {}
Cloner();
Cloner(const Cloner&) = delete;
Cloner& operator=(const Cloner&) = delete;
Status copyDb(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost,
const std::vector<NamespaceString>& shardedColls,
std::set<std::string>* clonedColls);
StatusWith<std::vector<BSONObj>> getListOfCollections(OperationContext* opCtx,
const std::string& dBName,
const std::string& masterHost);
private:
std::unique_ptr<ClonerImpl> _clonerImpl;
};
} // namespace mongo
|
