mirror of https://github.com/facebook/rocksdb.git
134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Logger implementation that can be shared by all environments
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// where enough posix functionality is available.
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#pragma once
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#include <list>
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#include <string>
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#include "port/port.h"
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#include "port/util_logger.h"
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#include "util/filename.h"
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#include "util/mutexlock.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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#ifndef ROCKSDB_LITE
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// Rolls the log file by size and/or time
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class AutoRollLogger : public Logger {
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public:
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AutoRollLogger(Env* env, const std::string& dbname,
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const std::string& db_log_dir, size_t log_max_size,
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size_t log_file_time_to_roll,
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const InfoLogLevel log_level = InfoLogLevel::INFO_LEVEL)
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: Logger(log_level),
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dbname_(dbname),
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db_log_dir_(db_log_dir),
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env_(env),
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status_(Status::OK()),
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kMaxLogFileSize(log_max_size),
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kLogFileTimeToRoll(log_file_time_to_roll),
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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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call_NowMicros_every_N_records_(100),
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mutex_() {
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env->GetAbsolutePath(dbname, &db_absolute_path_);
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log_fname_ = InfoLogFileName(dbname_, db_absolute_path_, db_log_dir_);
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RollLogFile();
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ResetLogger();
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}
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using Logger::Logv;
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void Logv(const char* format, va_list ap) override;
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// Write a header entry to the log. All header information will be written
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// again every time the log rolls over.
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virtual void LogHeader(const char* format, va_list ap) override;
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// check if the logger has encountered any problem.
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Status GetStatus() {
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return status_;
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}
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size_t GetLogFileSize() const override {
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std::shared_ptr<Logger> logger;
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{
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MutexLock l(&mutex_);
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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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return logger->GetLogFileSize();
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}
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void Flush() override {
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std::shared_ptr<Logger> logger;
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{
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MutexLock l(&mutex_);
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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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TEST_SYNC_POINT("AutoRollLogger::Flush:PinnedLogger");
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if (logger) {
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logger->Flush();
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}
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}
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virtual ~AutoRollLogger() {
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}
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void SetCallNowMicrosEveryNRecords(uint64_t call_NowMicros_every_N_records) {
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call_NowMicros_every_N_records_ = call_NowMicros_every_N_records;
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}
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// Expose the log file path for testing purpose
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std::string TEST_log_fname() const {
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return log_fname_;
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}
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uint64_t TEST_ctime() const { return ctime_; }
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private:
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bool LogExpired();
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Status ResetLogger();
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void RollLogFile();
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// Log message to logger without rolling
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void LogInternal(const char* format, ...);
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// Serialize the va_list to a string
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std::string ValistToString(const char* format, va_list args) const;
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// Write the logs marked as headers to the new log file
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void WriteHeaderInfo();
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std::string log_fname_; // Current active info log's file name.
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std::string dbname_;
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std::string db_log_dir_;
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std::string db_absolute_path_;
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Env* env_;
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std::shared_ptr<Logger> logger_;
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// current status of the logger
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Status status_;
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const size_t kMaxLogFileSize;
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const size_t kLogFileTimeToRoll;
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// header information
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std::list<std::string> headers_;
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// to avoid frequent env->NowMicros() calls, we cached the current time
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uint64_t cached_now;
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uint64_t ctime_;
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uint64_t cached_now_access_count;
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uint64_t call_NowMicros_every_N_records_;
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mutable port::Mutex mutex_;
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};
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#endif // !ROCKSDB_LITE
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// Facade to craete logger automatically
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Status CreateLoggerFromOptions(const std::string& dbname,
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const DBOptions& options,
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std::shared_ptr<Logger>* logger);
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} // namespace rocksdb
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