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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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/session_update_tracker.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/session.h"
#include "mongo/db/session_txn_record_gen.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
namespace {
/**
* Constructs a new oplog entry if the given entry has transaction state embedded within in. The new
* oplog entry will contain the operation needed to replicate the transaction table.
*
* Returns boost::none if the given oplog doesn't have any transaction state or does not support
* update to the transaction table.
*/
boost::optional<repl::OplogEntry> createMatchingTransactionTableUpdate(
const repl::OplogEntry& entry) {
auto sessionInfo = entry.getOperationSessionInfo();
if (!sessionInfo.getTxnNumber()) {
return boost::none;
}
invariant(sessionInfo.getSessionId());
invariant(entry.getWallClockTime());
const auto updateBSON = [&] {
SessionTxnRecord newTxnRecord;
newTxnRecord.setSessionId(*sessionInfo.getSessionId());
newTxnRecord.setTxnNum(*sessionInfo.getTxnNumber());
newTxnRecord.setLastWriteOpTime(entry.getOpTime());
newTxnRecord.setLastWriteDate(*entry.getWallClockTime());
switch (entry.getCommandType()) {
case repl::OplogEntry::CommandType::kApplyOps:
newTxnRecord.setState(entry.shouldPrepare() ? DurableTxnStateEnum::kPrepared
: DurableTxnStateEnum::kCommitted);
break;
case repl::OplogEntry::CommandType::kCommitTransaction:
newTxnRecord.setState(DurableTxnStateEnum::kCommitted);
break;
case repl::OplogEntry::CommandType::kAbortTransaction:
newTxnRecord.setState(DurableTxnStateEnum::kAborted);
break;
default:
break;
}
return newTxnRecord.toBSON();
}();
return repl::OplogEntry(
entry.getOpTime(),
boost::none, // hash
repl::OpTypeEnum::kUpdate,
NamespaceString::kSessionTransactionsTableNamespace,
boost::none, // uuid
false, // fromMigrate
repl::OplogEntry::kOplogVersion,
updateBSON,
BSON(SessionTxnRecord::kSessionIdFieldName << sessionInfo.getSessionId()->toBSON()),
{}, // sessionInfo
true, // upsert
*entry.getWallClockTime(),
boost::none, // statementId
boost::none, // prevWriteOpTime
boost::none, // preImangeOpTime
boost::none // postImageOpTime
);
}
} // namespace
boost::optional<std::vector<OplogEntry>> SessionUpdateTracker::updateOrFlush(
const OplogEntry& entry) {
const auto& ns = entry.getNss();
if (ns == NamespaceString::kSessionTransactionsTableNamespace ||
(ns.isConfigDB() && ns.isCommand())) {
return _flush(entry);
}
_updateSessionInfo(entry);
return boost::none;
}
void SessionUpdateTracker::_updateSessionInfo(const OplogEntry& entry) {
const auto& sessionInfo = entry.getOperationSessionInfo();
if (!sessionInfo.getTxnNumber()) {
return;
}
const auto& lsid = sessionInfo.getSessionId();
invariant(lsid);
auto iter = _sessionsToUpdate.find(*lsid);
if (iter == _sessionsToUpdate.end()) {
_sessionsToUpdate.emplace(*lsid, entry);
return;
}
const auto& existingSessionInfo = iter->second.getOperationSessionInfo();
if (*sessionInfo.getTxnNumber() >= *existingSessionInfo.getTxnNumber()) {
iter->second = entry;
return;
}
severe() << "Entry for session " << lsid->toBSON() << " has txnNumber "
<< *sessionInfo.getTxnNumber() << " < " << *existingSessionInfo.getTxnNumber();
severe() << "New oplog entry: " << redact(entry.toString());
severe() << "Existing oplog entry: " << redact(iter->second.toString());
fassertFailedNoTrace(50843);
}
std::vector<OplogEntry> SessionUpdateTracker::_flush(const OplogEntry& entry) {
switch (entry.getOpType()) {
case OpTypeEnum::kInsert:
case OpTypeEnum::kNoop:
// Session table is keyed by session id, so nothing to do here because
// it would have triggered a unique index violation in the primary if
// it was trying to insert with the same session id with existing ones.
return {};
case OpTypeEnum::kUpdate:
return _flushForQueryPredicate(*entry.getObject2());
case OpTypeEnum::kDelete:
return _flushForQueryPredicate(entry.getObject());
case OpTypeEnum::kCommand:
return flushAll();
}
MONGO_UNREACHABLE;
}
std::vector<OplogEntry> SessionUpdateTracker::flushAll() {
std::vector<OplogEntry> opList;
for (auto&& entry : _sessionsToUpdate) {
auto newUpdate = createMatchingTransactionTableUpdate(entry.second);
invariant(newUpdate);
opList.push_back(std::move(*newUpdate));
}
_sessionsToUpdate.clear();
return opList;
}
std::vector<OplogEntry> SessionUpdateTracker::_flushForQueryPredicate(
const BSONObj& queryPredicate) {
auto idField = queryPredicate["_id"].Obj();
auto lsid = LogicalSessionId::parse(IDLParserErrorContext("lsidInOplogQuery"), idField);
auto iter = _sessionsToUpdate.find(lsid);
if (iter == _sessionsToUpdate.end()) {
return {};
}
std::vector<OplogEntry> opList;
auto updateOplog = createMatchingTransactionTableUpdate(iter->second);
invariant(updateOplog);
opList.push_back(std::move(*updateOplog));
_sessionsToUpdate.erase(iter);
return opList;
}
} // namespace repl
} // namespace mongo
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