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/**
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/query/getmore_request.h"
#include "mongo/db/namespace_string.h"
#include <boost/optional.hpp>
#include "mongo/util/assert_util.h"
#include "mongo/util/stringutils.h"
namespace mongo {
GetMoreRequest::GetMoreRequest()
: cursorid(0),
batchSize(0) { }
GetMoreRequest::GetMoreRequest(const std::string& fullns,
CursorId id,
boost::optional<int> sizeOfBatch)
: nss(fullns),
cursorid(id),
batchSize(sizeOfBatch) { }
Status GetMoreRequest::isValid() const {
if (!nss.isValid()) {
return Status(ErrorCodes::BadValue, str::stream()
<< "Invalid namespace for getMore: " << nss.ns());
}
if (cursorid == 0) {
return Status(ErrorCodes::BadValue, "Cursor id for getMore must be non-zero");
}
if (batchSize && *batchSize <= 0) {
return Status(ErrorCodes::BadValue, str::stream()
<< "Batch size for getMore must be positive, "
<< "but received: " << *batchSize);
}
return Status::OK();
}
// static
std::string GetMoreRequest::parseNs(const std::string& dbname, const BSONObj& cmdObj) {
BSONElement collElt = cmdObj["collection"];
const std::string coll = (collElt.type() == BSONType::String) ? collElt.String()
: "";
return str::stream() << dbname << "." << coll;
}
// static
StatusWith<GetMoreRequest> GetMoreRequest::parseFromBSON(const std::string& dbname,
const BSONObj& cmdObj) {
invariant(!dbname.empty());
// Required fields.
boost::optional<CursorId> cursorid;
boost::optional<std::string> fullns;
// Optional field.
boost::optional<int> batchSize;
for (BSONElement el : cmdObj) {
const char* fieldName = el.fieldName();
if (str::equals(fieldName, "getMore")) {
if (el.type() != BSONType::NumberLong) {
return {ErrorCodes::TypeMismatch,
str::stream() << "Field 'getMore' must be of type long in: " << cmdObj};
}
cursorid = el.Long();
}
else if (str::equals(fieldName, "collection")) {
if (el.type() != BSONType::String) {
return {ErrorCodes::TypeMismatch,
str::stream() << "Field 'collection' must be of type string in: "
<< cmdObj};
}
fullns = parseNs(dbname, cmdObj);
}
else if (str::equals(fieldName, "batchSize")) {
if (!el.isNumber()) {
return {ErrorCodes::TypeMismatch,
str::stream() << "Field 'batchSize' must be a number in: " << cmdObj};
}
batchSize = el.numberInt();
}
else if (str::equals(fieldName, "maxTimeMS")) {
// maxTimeMS is parsed by the command handling code, so we don't repeat the parsing
// here.
continue;
}
else if (!str::startsWith(fieldName, "$")) {
return {ErrorCodes::FailedToParse,
str::stream() << "Failed to parse: " << cmdObj << ". "
<< "Unrecognized field '" << fieldName << "'."};
}
}
if (!cursorid) {
return {ErrorCodes::FailedToParse,
str::stream() << "Field 'getMore' missing in: " << cmdObj};
}
if (!fullns) {
return {ErrorCodes::FailedToParse,
str::stream() << "Field 'collection' missing in: " << cmdObj};
}
GetMoreRequest request(*fullns, *cursorid, batchSize);
Status validStatus = request.isValid();
if (!validStatus.isOK()) {
return validStatus;
}
return request;
}
} // namespace mongo
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