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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 "mongo/platform/basic.h"
#include "mongo/db/transaction_validation.h"
#include "mongo/db/commands.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/write_concern_options.h"
namespace mongo {
namespace {
// The command names for which to check out a session. These are commands that support retryable
// writes, readConcern snapshot, or multi-statement transactions. We additionally check out the
// session for commands that can take a lock and then run another whitelisted command in
// DBDirectClient. Otherwise, the nested command would try to check out a session under a lock,
// which is not allowed.
const StringMap<int> sessionCheckOutList = {{"abortTransaction", 1},
{"aggregate", 1},
{"applyOps", 1},
{"commitTransaction", 1},
{"count", 1},
{"delete", 1},
{"distinct", 1},
{"doTxn", 1},
{"explain", 1},
{"filemd5", 1},
{"find", 1},
{"findandmodify", 1},
{"findAndModify", 1},
{"geoNear", 1},
{"geoSearch", 1},
{"getMore", 1},
{"group", 1},
{"insert", 1},
{"killCursors", 1},
{"prepareTransaction", 1},
{"refreshLogicalSessionCacheNow", 1},
{"update", 1}};
// Commands that can be sent with session info but should not check out a session.
const StringMap<int> skipSessionCheckoutList = {
{"coordinateCommitTransaction", 1}, {"voteAbortTransaction", 1}, {"voteCommitTransaction", 1}};
bool commandCanCheckOutSession(StringData cmdName) {
return sessionCheckOutList.find(cmdName) != sessionCheckOutList.cend();
}
} // namespace
void validateWriteConcernForTransaction(const WriteConcernOptions& wcResult, StringData cmdName) {
uassert(ErrorCodes::InvalidOptions,
"writeConcern is not allowed within a multi-statement transaction",
wcResult.usedDefault || cmdName == "commitTransaction" ||
cmdName == "coordinateCommitTransaction" || cmdName == "abortTransaction" ||
cmdName == "prepareTransaction" || cmdName == "doTxn");
}
bool shouldCommandSkipSessionCheckout(StringData cmdName) {
return skipSessionCheckoutList.find(cmdName) != skipSessionCheckoutList.cend();
}
void validateSessionOptions(const OperationSessionInfoFromClient& sessionOptions,
StringData cmdName,
StringData dbname) {
if (sessionOptions.getAutocommit()) {
uassertStatusOK(CommandHelpers::canUseTransactions(dbname, cmdName));
}
if (sessionOptions.getTxnNumber()) {
uassert(50768,
str::stream() << "It is illegal to provide a txnNumber for command " << cmdName,
commandCanCheckOutSession(cmdName) || shouldCommandSkipSessionCheckout(cmdName));
}
if (sessionOptions.getStartTransaction()) {
uassert(ErrorCodes::OperationNotSupportedInTransaction,
"Cannot run killCursors as the first operation in a multi-document transaction.",
cmdName != "killCursors");
}
}
} // namespace mongo
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