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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 <limits>
#include <ostream>
#include <sstream>
#include <string>
#include <utility>
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/repl/optime.h"
namespace mongo {
namespace repl {
const char OpTime::kTimestampFieldName[] = "ts";
const char OpTime::kTermFieldName[] = "t";
const long long OpTime::kInitialTerm = 0;
// static
OpTime OpTime::max() {
return OpTime(Timestamp::max(), std::numeric_limits<decltype(OpTime::_term)>::max());
}
void OpTime::append(BSONObjBuilder* builder, const std::string& subObjName) const {
BSONObjBuilder opTimeBuilder(builder->subobjStart(subObjName));
opTimeBuilder.append(kTimestampFieldName, _timestamp);
opTimeBuilder.append(kTermFieldName, _term);
opTimeBuilder.doneFast();
}
StatusWith<OpTime> OpTime::parseFromOplogEntry(const BSONObj& obj) {
Timestamp ts;
Status status = bsonExtractTimestampField(obj, kTimestampFieldName, &ts);
if (!status.isOK())
return status;
// Default to -1 if the term is absent.
long long term;
status = bsonExtractIntegerFieldWithDefault(obj, kTermFieldName, kUninitializedTerm, &term);
if (!status.isOK())
return status;
return OpTime(ts, term);
}
BSONObj OpTime::toBSON() const {
BSONObjBuilder bldr;
bldr.append(kTimestampFieldName, _timestamp);
bldr.append(kTermFieldName, _term);
return bldr.obj();
}
// static
OpTime OpTime::parse(const BSONObj& obj) {
return uassertStatusOK(parseFromOplogEntry(obj));
}
std::string OpTime::toString() const {
return toBSON().toString();
}
std::ostream& operator<<(std::ostream& out, const OpTime& opTime) {
return out << opTime.toString();
}
void OpTime::appendAsQuery(BSONObjBuilder* builder) const {
builder->append(kTimestampFieldName, _timestamp);
if (_term == kUninitializedTerm) {
// pv0 oplogs don't actually have the term field so don't query for {t: -1}.
builder->append(kTermFieldName, BSON("$exists" << false));
} else {
builder->append(kTermFieldName, _term);
}
}
BSONObj OpTime::asQuery() const {
BSONObjBuilder builder;
appendAsQuery(&builder);
return builder.obj();
}
} // namespace repl
BSONObjBuilder& operator<<(BSONObjBuilderValueStream& builder, const repl::OpTime& value) {
return builder << value.toBSON();
}
} // namespace mongo
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