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
|
/**
* Copyright (C) 2008 10gen 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 <boost/filesystem/path.hpp>
#include <memory>
#include "mongo/db/db.h"
#include "mongo/db/record_id.h"
#include "mongo/db/storage/data_protector.h"
namespace mongo {
class Collection;
class Cursor;
class DataProtector;
class OperationContext;
struct KeyRange;
struct WriteConcernOptions;
/**
* db helpers are helper functions and classes that let us easily manipulate the local
* database instance in-proc.
*
* all helpers assume locking is handled above them
*/
struct Helpers {
class RemoveSaver;
/* fetch a single object from collection ns that matches query.
set your db SavedContext first.
@param query - the query to perform. note this is the low level portion of query so
"orderby : ..." won't work.
@param requireIndex if true, assert if no index for the query. a way to guard against
writing a slow query.
@return true if object found
*/
static bool findOne(OperationContext* txn,
Collection* collection,
const BSONObj& query,
BSONObj& result,
bool requireIndex = false);
static RecordId findOne(OperationContext* txn,
Collection* collection,
const BSONObj& query,
bool requireIndex);
/**
* @param foundIndex if passed in will be set to 1 if ns and index found
* @return true if object found
*/
static bool findById(OperationContext* txn,
Database* db,
const char* ns,
BSONObj query,
BSONObj& result,
bool* nsFound = 0,
bool* indexFound = 0);
/* TODO: should this move into Collection?
* uasserts if no _id index.
* @return null loc if not found */
static RecordId findById(OperationContext* txn, Collection* collection, const BSONObj& query);
/**
* Get the first object generated from a forward natural-order scan on "ns". Callers do not
* have to lock "ns".
*
* Returns true if there is such an object. An owned copy of the object is placed into the
* out-argument "result".
*
* Returns false if there is no such object.
*/
static bool getSingleton(OperationContext* txn, const char* ns, BSONObj& result);
/**
* Same as getSingleton, but with a reverse natural-order scan on "ns".
*/
static bool getLast(OperationContext* txn, const char* ns, BSONObj& result);
/**
* Performs an upsert of "obj" into the collection "ns", with an empty update predicate.
* Callers must have "ns" locked.
*/
static void putSingleton(OperationContext* txn, const char* ns, BSONObj obj);
/**
* you have to lock
* you do not have to have Context set
* o has to have an _id field or will assert
*/
static void upsert(OperationContext* txn,
const std::string& ns,
const BSONObj& o,
bool fromMigrate = false);
// TODO: this should be somewhere else probably
/* Takes object o, and returns a new object with the
* same field elements but the names stripped out.
* Example:
* o = {a : 5 , b : 6} --> {"" : 5, "" : 6}
*/
static BSONObj toKeyFormat(const BSONObj& o);
/* Takes object o, and infers an ascending keyPattern with the same fields as o
* Example:
* o = {a : 5 , b : 6} --> {a : 1 , b : 1 }
*/
static BSONObj inferKeyPattern(const BSONObj& o);
/**
* Takes a namespace range, specified by a min and max and qualified by an index pattern,
* and removes all the documents in that range found by iterating
* over the given index. Caller is responsible for insuring that min/max are
* compatible with the given keyPattern (e.g min={a:100} is compatible with
* keyPattern={a:1,b:1} since it can be extended to {a:100,b:minKey}, but
* min={b:100} is not compatible).
*
* Caller must hold a write lock on 'ns'
*
* Returns -1 when no usable index exists
*
* Does oplog the individual document deletions.
* // TODO: Refactor this mechanism, it is growing too large
*/
static long long removeRange(OperationContext* txn,
const KeyRange& range,
BoundInclusion boundInclusion,
const WriteConcernOptions& secondaryThrottle,
RemoveSaver* callback = NULL,
bool fromMigrate = false,
bool onlyRemoveOrphanedDocs = false);
/**
* Remove all documents from a collection.
* You do not need to set the database before calling.
* Does not oplog the operation.
*/
static void emptyCollection(OperationContext* txn, const char* ns);
/**
* for saving deleted bson objects to a flat file
*/
class RemoveSaver {
MONGO_DISALLOW_COPYING(RemoveSaver);
public:
RemoveSaver(const std::string& type, const std::string& ns, const std::string& why);
~RemoveSaver();
/**
* Writes document to file. File is created lazily before writing the first document.
* Returns error status if the file could not be created or if there were errors writing
* to the file.
*/
Status goingToDelete(const BSONObj& o);
private:
boost::filesystem::path _root;
boost::filesystem::path _file;
std::unique_ptr<DataProtector> _protector;
std::unique_ptr<std::ostream> _out;
};
};
} // namespace mongo
|
