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
|
/**
* Copyright (C) 2016 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/query/cursor_request.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobj.h"
namespace mongo {
Status CursorRequest::parseCommandCursorOptions(const BSONObj& cmdObj,
long long defaultBatchSize,
long long* batchSize) {
invariant(batchSize);
*batchSize = defaultBatchSize;
BSONElement cursorElem = cmdObj["cursor"];
if (cursorElem.eoo()) {
return Status::OK();
}
if (cursorElem.type() != mongo::Object) {
return Status(ErrorCodes::TypeMismatch, "cursor field must be missing or an object");
}
BSONObj cursor = cursorElem.embeddedObject();
BSONElement batchSizeElem = cursor["batchSize"];
const int expectedNumberOfCursorFields = batchSizeElem.eoo() ? 0 : 1;
if (cursor.nFields() != expectedNumberOfCursorFields) {
return Status(ErrorCodes::BadValue,
"cursor object can't contain fields other than batchSize");
}
if (batchSizeElem.eoo()) {
return Status::OK();
}
if (!batchSizeElem.isNumber()) {
return Status(ErrorCodes::TypeMismatch, "cursor.batchSize must be a number");
}
// This can change in the future, but for now all negatives are reserved.
if (batchSizeElem.numberLong() < 0) {
return Status(ErrorCodes::BadValue, "cursor.batchSize must not be negative");
}
*batchSize = batchSizeElem.numberLong();
return Status::OK();
}
} // namespace mongo
|
