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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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
#include "mongo/db/record_id_helpers.h"
#include <limits>
#include "mongo/bson/bson_validate.h"
#include "mongo/bson/timestamp.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/record_id.h"
#include "mongo/db/storage/key_string.h"
#include "mongo/logv2/redaction.h"
#include "mongo/util/debug_util.h"
namespace mongo {
namespace record_id_helpers {
StatusWith<RecordId> keyForOptime(const Timestamp& opTime) {
// Make sure secs and inc wouldn't be negative if treated as signed. This ensures that they
// don't sort differently when put in a RecordId. It also avoids issues with Null/Invalid
// RecordIds
if (opTime.getSecs() > uint32_t(std::numeric_limits<int32_t>::max()))
return StatusWith<RecordId>(ErrorCodes::BadValue, "ts secs too high");
if (opTime.getInc() > uint32_t(std::numeric_limits<int32_t>::max()))
return StatusWith<RecordId>(ErrorCodes::BadValue, "ts inc too high");
const RecordId out = RecordId(opTime.getSecs(), opTime.getInc());
if (out <= RecordId::minLong())
return StatusWith<RecordId>(ErrorCodes::BadValue, "ts too low");
if (out >= RecordId::maxLong())
return StatusWith<RecordId>(ErrorCodes::BadValue, "ts too high");
return StatusWith<RecordId>(out);
}
/**
* data and len must be the arguments from RecordStore::insert() on an oplog collection.
*/
StatusWith<RecordId> extractKeyOptime(const char* data, int len) {
// Use the latest BSON validation version. Oplog entries are allowed to contain decimal data
// even if decimal is disabled.
if (kDebugBuild)
invariant(validateBSON(data, len).isOK());
const BSONObj obj(data);
const BSONElement elem = obj["ts"];
if (elem.eoo())
return StatusWith<RecordId>(ErrorCodes::BadValue, "no ts field");
if (elem.type() != bsonTimestamp)
return StatusWith<RecordId>(ErrorCodes::BadValue, "ts must be a Timestamp");
return keyForOptime(elem.timestamp());
}
StatusWith<RecordId> keyForDoc(const BSONObj& doc) {
// Build a KeyString as the RecordId using the "_id" field.
BSONElement idElem;
bool foundId = doc.getObjectID(idElem);
if (!foundId) {
return {ErrorCodes::BadValue,
str::stream() << "Document " << redact(doc) << " is missing the '_id' field"};
}
return keyForElem(idElem);
}
RecordId keyForElem(const BSONElement& elem) {
// Intentionally discard the TypeBits since the type information will be stored in the _id of
// the original document. The consequence of this behavior is that _id values that compare
// similarly, but are of different types may not be used concurrently.
KeyString::Builder keyBuilder(KeyString::Version::kLatestVersion);
keyBuilder.appendBSONElement(elem);
return RecordId(keyBuilder.getBuffer(), keyBuilder.getSize());
}
RecordId keyForOID(OID oid) {
KeyString::Builder keyBuilder(KeyString::Version::kLatestVersion);
keyBuilder.appendOID(oid);
return RecordId(keyBuilder.getBuffer(), keyBuilder.getSize());
}
void appendToBSONAs(RecordId rid, BSONObjBuilder* builder, StringData fieldName) {
rid.withFormat([&](RecordId::Null) { builder->appendNull(fieldName); },
[&](int64_t val) { builder->append(fieldName, val); },
[&](const char* str, int len) {
KeyString::appendSingleFieldToBSONAs(str, len, fieldName, builder);
});
}
BSONObj toBSONAs(RecordId rid, StringData fieldName) {
BSONObjBuilder builder;
appendToBSONAs(rid, &builder, fieldName);
return builder.obj();
}
namespace {
static constexpr int64_t kMinReservedLong = RecordId::kMaxRepr - (1024 * 1024);
// All RecordId strings that start with FF are considered reserved. This also happens to be an
// invalid start byte for a KeyString sequence, which is used to encode RecordId binary strings.
static constexpr char kReservedStrPrefix = static_cast<char>(0xFF);
} // namespace
RecordId reservedIdFor(ReservationId res, KeyFormat keyFormat) {
// There is only one reservation at the moment.
invariant(res == ReservationId::kWildcardMultikeyMetadataId);
if (keyFormat == KeyFormat::Long) {
return RecordId(kMinReservedLong);
} else {
invariant(keyFormat == KeyFormat::String);
constexpr char reservation[] = {kReservedStrPrefix, 0};
return RecordId(reservation, sizeof(reservation));
}
}
bool isReserved(RecordId id) {
if (id.isNull()) {
return false;
}
if (id.isLong()) {
return id.getLong() >= kMinReservedLong && id.getLong() < RecordId::kMaxRepr;
}
// All RecordId strings that start with FF are considered reserved.
auto strData = id.getStr();
return strData.rawData()[0] == kReservedStrPrefix;
}
} // namespace record_id_helpers
} // namespace mongo
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