mirror of https://gitee.com/bigwinds/arangodb
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#include "LockfileFeature.h"
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#include "Basics/Exceptions.h"
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#include "Basics/FileUtils.h"
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#include "Basics/files.h"
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#include "Logger/Logger.h"
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#include "RestServer/DatabasePathFeature.h"
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using namespace arangodb;
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using namespace arangodb::basics;
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LockfileFeature::LockfileFeature(
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application_features::ApplicationServer* server)
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: ApplicationFeature(server, "Lockfile") {
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setOptional(false);
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requiresElevatedPrivileges(false);
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startsAfter("DatabasePath");
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}
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void LockfileFeature::start() {
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// build lockfile name
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auto database = application_features::ApplicationServer::getFeature<DatabasePathFeature>("DatabasePath");
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_lockFilename = database->subdirectoryName("LOCK");
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TRI_ASSERT(!_lockFilename.empty());
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int res = TRI_VerifyLockFile(_lockFilename.c_str());
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if (res != TRI_ERROR_NO_ERROR) {
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std::string otherPID;
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try {
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otherPID = FileUtils::slurp(_lockFilename.c_str());
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}
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catch (...) {}
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LOG_TOPIC(FATAL, arangodb::Logger::FIXME) << "database is locked by process " <<
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otherPID << "; please stop it and remove the lock file '" << _lockFilename << "'";
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FATAL_ERROR_EXIT();
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}
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if (TRI_ExistsFile(_lockFilename.c_str())) {
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res = TRI_UnlinkFile(_lockFilename.c_str());
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if (res != TRI_ERROR_NO_ERROR) {
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LOG_TOPIC(FATAL, arangodb::Logger::FIXME)
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<< "failed to remove an abandoned lock file in the database directory, please check the file permissions on the lock file '"
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<< _lockFilename << "': " << TRI_errno_string(res);
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FATAL_ERROR_EXIT();
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}
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}
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res = TRI_CreateLockFile(_lockFilename.c_str());
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if (res != TRI_ERROR_NO_ERROR) {
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LOG_TOPIC(FATAL, arangodb::Logger::FIXME)
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<< "failed to lock the database directory using "
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<< _lockFilename << "': " << TRI_errno_string(res);
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FATAL_ERROR_EXIT();
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}
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}
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void LockfileFeature::unprepare() {
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TRI_DestroyLockFile(_lockFilename.c_str());
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}
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