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/**
* 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.
*/
#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
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