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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include <utility>
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/repl/bson_extract_optime.h"
#include "mongo/db/repl/optime.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace rpc {
namespace {
const char kGLEStatsFieldName[] = "$gleStats";
const char kGLEStatsLastOpTimeFieldName[] = "lastOpTime";
const char kGLEStatsElectionIdFieldName[] = "electionId";
} // namespace
StatusWith<ShardingMetadata> ShardingMetadata::readFromMetadata(const BSONObj& metadataObj) {
BSONElement smElem;
auto smExtractStatus =
bsonExtractTypedField(metadataObj, kGLEStatsFieldName, mongo::Object, &smElem);
if (!smExtractStatus.isOK()) {
return smExtractStatus;
}
if (smElem.embeddedObject().nFields() != 2) {
return Status(ErrorCodes::InvalidOptions,
str::stream() << "The $gleStats object can only have 2 fields, but got "
<< smElem.embeddedObject().toString());
}
repl::OpTime opTime;
const BSONElement opTimeElement = smElem.embeddedObject()[kGLEStatsLastOpTimeFieldName];
if (opTimeElement.eoo()) {
return Status(ErrorCodes::NoSuchKey, "lastOpTime field missing");
} else if (opTimeElement.type() == bsonTimestamp) {
opTime = repl::OpTime(opTimeElement.timestamp(), repl::OpTime::kUninitializedTerm);
} else if (opTimeElement.type() == Date) {
opTime = repl::OpTime(Timestamp(opTimeElement.date()), repl::OpTime::kUninitializedTerm);
} else if (opTimeElement.type() == Object) {
Status status =
bsonExtractOpTimeField(smElem.embeddedObject(), kGLEStatsLastOpTimeFieldName, &opTime);
if (!status.isOK()) {
return status;
}
} else {
return Status(ErrorCodes::TypeMismatch,
str::stream() << "Expected \"" << kGLEStatsLastOpTimeFieldName
<< "\" field in response to replSetHeartbeat "
"command to have type Date or Timestamp, but found type "
<< typeName(opTimeElement.type()));
}
BSONElement lastElectionIdElem;
auto lastElectionIdExtractStatus = bsonExtractTypedField(
smElem.embeddedObject(), kGLEStatsElectionIdFieldName, mongo::jstOID, &lastElectionIdElem);
if (!lastElectionIdExtractStatus.isOK()) {
return lastElectionIdExtractStatus;
}
return ShardingMetadata(opTime, lastElectionIdElem.OID());
}
Status ShardingMetadata::writeToMetadata(BSONObjBuilder* metadataBob) const {
BSONObjBuilder subobj(metadataBob->subobjStart(kGLEStatsFieldName));
if (getLastOpTime().getTerm() > repl::OpTime::kUninitializedTerm) {
getLastOpTime().append(&subobj, kGLEStatsLastOpTimeFieldName);
} else {
subobj.append(kGLEStatsLastOpTimeFieldName, getLastOpTime().getTimestamp());
}
subobj.append(kGLEStatsElectionIdFieldName, getLastElectionId());
return Status::OK();
}
ShardingMetadata::ShardingMetadata(repl::OpTime lastOpTime, OID lastElectionId)
: _lastOpTime(std::move(lastOpTime)), _lastElectionId(std::move(lastElectionId)) {}
const repl::OpTime& ShardingMetadata::getLastOpTime() const {
return _lastOpTime;
}
const OID& ShardingMetadata::getLastElectionId() const {
return _lastElectionId;
}
} // namespace rpc
} // namespace mongo
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