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resume_token.cpp
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resume_token.cpp
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/**
* Copyright (C) 2017 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/db/pipeline/resume_token.h"
#include <boost/optional/optional_io.hpp>
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/pipeline/document_sources_gen.h"
#include "mongo/db/pipeline/value_comparator.h"
#include "mongo/db/storage/key_string.h"
namespace mongo {
constexpr StringData ResumeToken::kDataFieldName;
constexpr StringData ResumeToken::kTypeBitsFieldName;
bool ResumeTokenData::operator==(const ResumeTokenData& other) const {
return clusterTime == other.clusterTime &&
(Value::compare(this->documentKey, other.documentKey, nullptr) == 0) && uuid == other.uuid;
}
std::ostream& operator<<(std::ostream& out, const ResumeTokenData& tokenData) {
return out << "{clusterTime: " << tokenData.clusterTime.toString()
<< " documentKey: " << tokenData.documentKey << " uuid: " << tokenData.uuid << "}";
}
ResumeToken::ResumeToken(const Document& resumeDoc) {
_keyStringData = resumeDoc[kDataFieldName];
_typeBits = resumeDoc[kTypeBitsFieldName];
uassert(40647,
str::stream() << "Bad resume token: _data of missing or of wrong type"
<< resumeDoc.toString(),
_keyStringData.getType() == BinData &&
_keyStringData.getBinData().type == BinDataGeneral);
uassert(40648,
str::stream() << "Bad resume token: _typeBits of wrong type" << resumeDoc.toString(),
_typeBits.missing() ||
(_typeBits.getType() == BinData && _typeBits.getBinData().type == BinDataGeneral));
}
// We encode the resume token as a KeyString with the sequence: clusterTime, documentKey, uuid.
// Only the clusterTime is required.
ResumeToken::ResumeToken(const ResumeTokenData& data) {
BSONObjBuilder builder;
builder.append("", data.clusterTime);
data.documentKey.addToBsonObj(&builder, "");
if (data.uuid) {
if (data.documentKey.missing()) {
// Never allow a missing document key with a UUID present, as that will mess up
// the field order.
builder.appendNull("");
}
data.uuid->appendToBuilder(&builder, "");
}
auto keyObj = builder.obj();
KeyString encodedToken(KeyString::Version::V1, keyObj, Ordering::make(BSONObj()));
_keyStringData = Value(
BSONBinData(encodedToken.getBuffer(), encodedToken.getSize(), BinDataType::BinDataGeneral));
const auto& typeBits = encodedToken.getTypeBits();
if (!typeBits.isAllZeros())
_typeBits = Value(
BSONBinData(typeBits.getBuffer(), typeBits.getSize(), BinDataType::BinDataGeneral));
}
ResumeTokenData ResumeToken::getData() const {
KeyString::TypeBits typeBits(KeyString::Version::V1);
if (!_typeBits.missing()) {
BSONBinData typeBitsBinData = _typeBits.getBinData();
BufReader typeBitsReader(typeBitsBinData.data, typeBitsBinData.length);
typeBits.resetFromBuffer(&typeBitsReader);
}
BSONBinData keyStringBinData = _keyStringData.getBinData();
auto internalBson = KeyString::toBson(static_cast<const char*>(keyStringBinData.data),
keyStringBinData.length,
Ordering::make(BSONObj()),
typeBits);
BSONObjIterator i(internalBson);
ResumeTokenData result;
uassert(40649, "invalid empty resume token", i.more());
result.clusterTime = i.next().timestamp();
if (i.more())
result.documentKey = Value(i.next());
if (i.more())
result.uuid = uassertStatusOK(UUID::parse(i.next()));
uassert(40646, "invalid oversized resume token", !i.more());
return result;
}
int ResumeToken::compare(const ResumeToken& other) const {
BSONBinData thisData = _keyStringData.getBinData();
BSONBinData otherData = other._keyStringData.getBinData();
return StringData(static_cast<const char*>(thisData.data), thisData.length)
.compare(StringData(static_cast<const char*>(otherData.data), otherData.length));
}
bool ResumeToken::operator==(const ResumeToken& other) const {
return compare(other) == 0;
}
bool ResumeToken::operator!=(const ResumeToken& other) const {
return compare(other) != 0;
}
bool ResumeToken::operator<(const ResumeToken& other) const {
return compare(other) < 0;
}
bool ResumeToken::operator<=(const ResumeToken& other) const {
return compare(other) <= 0;
}
bool ResumeToken::operator>(const ResumeToken& other) const {
return compare(other) > 0;
}
bool ResumeToken::operator>=(const ResumeToken& other) const {
return compare(other) >= 0;
}
Document ResumeToken::toDocument() const {
return Document{{kDataFieldName, _keyStringData}, {kTypeBitsFieldName, _typeBits}};
}
ResumeToken ResumeToken::parse(const Document& resumeDoc) {
return ResumeToken(resumeDoc);
}
} // namespace mongo