mirror of https://github.com/facebook/rocksdb.git
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#include "util/auto_roll_logger.h"
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#include "util/mutexlock.h"
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using namespace std;
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namespace rocksdb {
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// -- AutoRollLogger
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Status AutoRollLogger::ResetLogger() {
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status_ = env_->NewLogger(log_fname_, &logger_);
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if (!status_.ok()) {
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return status_;
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}
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if (logger_->GetLogFileSize() ==
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(size_t)Logger::DO_NOT_SUPPORT_GET_LOG_FILE_SIZE) {
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status_ = Status::NotSupported(
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"The underlying logger doesn't support GetLogFileSize()");
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}
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if (status_.ok()) {
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cached_now = static_cast<uint64_t>(env_->NowMicros() * 1e-6);
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ctime_ = cached_now;
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cached_now_access_count = 0;
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}
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return status_;
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}
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void AutoRollLogger::RollLogFile() {
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std::string old_fname = OldInfoLogFileName(
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dbname_, env_->NowMicros(), db_absolute_path_, db_log_dir_);
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env_->RenameFile(log_fname_, old_fname);
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}
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void AutoRollLogger::Logv(const char* format, va_list ap) {
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assert(GetStatus().ok());
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std::shared_ptr<Logger> logger;
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{
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MutexLock l(&mutex_);
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if ((kLogFileTimeToRoll > 0 && LogExpired()) ||
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(kMaxLogFileSize > 0 && logger_->GetLogFileSize() >= kMaxLogFileSize)) {
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RollLogFile();
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Status s = ResetLogger();
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if (!s.ok()) {
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// can't really log the error if creating a new LOG file failed
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return;
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}
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}
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// pin down the current logger_ instance before releasing the mutex.
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logger = logger_;
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}
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// Another thread could have put a new Logger instance into logger_ by now.
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// However, since logger is still hanging on to the previous instance
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// (reference count is not zero), we don't have to worry about it being
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// deleted while we are accessing it.
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// Note that logv itself is not mutex protected to allow maximum concurrency,
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// as thread safety should have been handled by the underlying logger.
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logger->Logv(format, ap);
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}
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bool AutoRollLogger::LogExpired() {
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if (cached_now_access_count >= call_NowMicros_every_N_records_) {
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cached_now = static_cast<uint64_t>(env_->NowMicros() * 1e-6);
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cached_now_access_count = 0;
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}
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++cached_now_access_count;
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return cached_now >= ctime_ + kLogFileTimeToRoll;
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}
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Status CreateLoggerFromOptions(
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const std::string& dbname,
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const std::string& db_log_dir,
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Env* env,
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const DBOptions& options,
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std::shared_ptr<Logger>* logger) {
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std::string db_absolute_path;
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env->GetAbsolutePath(dbname, &db_absolute_path);
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std::string fname = InfoLogFileName(dbname, db_absolute_path, db_log_dir);
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env->CreateDirIfMissing(dbname); // In case it does not exist
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// Currently we only support roll by time-to-roll and log size
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if (options.log_file_time_to_roll > 0 || options.max_log_file_size > 0) {
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AutoRollLogger* result = new AutoRollLogger(
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env, dbname, db_log_dir,
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options.max_log_file_size,
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options.log_file_time_to_roll, options.info_log_level);
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Status s = result->GetStatus();
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if (!s.ok()) {
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delete result;
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} else {
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logger->reset(result);
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}
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return s;
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} else {
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// Open a log file in the same directory as the db
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env->RenameFile(fname, OldInfoLogFileName(dbname, env->NowMicros(),
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db_absolute_path, db_log_dir));
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auto s = env->NewLogger(fname, logger);
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if (logger->get() != nullptr) {
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(*logger)->SetInfoLogLevel(options.info_log_level);
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}
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return s;
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}
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}
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} // namespace rocksdb
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