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+// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
+// This source code is licensed under both the GPLv2 (found in the
+// COPYING file in the root directory) and Apache 2.0 License
+// (found in the LICENSE.Apache file in the root directory).
+//
+// Logger implementation that can be shared by all environments
+// where enough posix functionality is available.
+
+#pragma once
+#include <list>
+#include <queue>
+#include <string>
+
+#include "file/filename.h"
+#include "port/port.h"
+#include "port/util_logger.h"
+#include "test_util/sync_point.h"
+#include "util/mutexlock.h"
+
+namespace ROCKSDB_NAMESPACE {
+class FileSystem;
+class SystemClock;
+
+#ifndef ROCKSDB_LITE
+// Rolls the log file by size and/or time
+class AutoRollLogger : public Logger {
+ public:
+ AutoRollLogger(const std::shared_ptr<FileSystem>& fs,
+ const std::shared_ptr<SystemClock>& clock,
+ const std::string& dbname, const std::string& db_log_dir,
+ size_t log_max_size, size_t log_file_time_to_roll,
+ size_t keep_log_file_num,
+ const InfoLogLevel log_level = InfoLogLevel::INFO_LEVEL);
+
+ using Logger::Logv;
+ void Logv(const char* format, va_list ap) override;
+
+ // Write a header entry to the log. All header information will be written
+ // again every time the log rolls over.
+ virtual void LogHeader(const char* format, va_list ap) override;
+
+ // check if the logger has encountered any problem.
+ Status GetStatus() { return status_; }
+
+ size_t GetLogFileSize() const override {
+ if (!logger_) {
+ return 0;
+ }
+
+ std::shared_ptr<Logger> logger;
+ {
+ MutexLock l(&mutex_);
+ // pin down the current logger_ instance before releasing the mutex.
+ logger = logger_;
+ }
+ return logger->GetLogFileSize();
+ }
+
+ void Flush() override {
+ std::shared_ptr<Logger> logger;
+ {
+ MutexLock l(&mutex_);
+ // pin down the current logger_ instance before releasing the mutex.
+ logger = logger_;
+ }
+ TEST_SYNC_POINT("AutoRollLogger::Flush:PinnedLogger");
+ if (logger) {
+ logger->Flush();
+ }
+ }
+
+ virtual ~AutoRollLogger() {
+ if (logger_ && !closed_) {
+ logger_->Close().PermitUncheckedError();
+ }
+ status_.PermitUncheckedError();
+ }
+
+ using Logger::GetInfoLogLevel;
+ InfoLogLevel GetInfoLogLevel() const override {
+ MutexLock l(&mutex_);
+ if (!logger_) {
+ return Logger::GetInfoLogLevel();
+ }
+ return logger_->GetInfoLogLevel();
+ }
+
+ using Logger::SetInfoLogLevel;
+ void SetInfoLogLevel(const InfoLogLevel log_level) override {
+ MutexLock lock(&mutex_);
+ Logger::SetInfoLogLevel(log_level);
+ if (logger_) {
+ logger_->SetInfoLogLevel(log_level);
+ }
+ }
+
+ void SetCallNowMicrosEveryNRecords(uint64_t call_NowMicros_every_N_records) {
+ call_NowMicros_every_N_records_ = call_NowMicros_every_N_records;
+ }
+
+ // Expose the log file path for testing purpose
+ std::string TEST_log_fname() const { return log_fname_; }
+
+ uint64_t TEST_ctime() const { return ctime_; }
+
+ Logger* TEST_inner_logger() const { return logger_.get(); }
+
+ protected:
+ // Implementation of Close()
+ virtual Status CloseImpl() override {
+ if (logger_) {
+ return logger_->Close();
+ } else {
+ return Status::OK();
+ }
+ }
+
+ private:
+ bool LogExpired();
+ Status ResetLogger();
+ void RollLogFile();
+ // Read all names of old log files into old_log_files_
+ // If there is any error, put the error code in status_
+ void GetExistingFiles();
+ // Delete old log files if it excceeds the limit.
+ Status TrimOldLogFiles();
+ // Log message to logger without rolling
+ void LogInternal(const char* format, ...);
+ // Serialize the va_list to a string
+ std::string ValistToString(const char* format, va_list args) const;
+ // Write the logs marked as headers to the new log file
+ void WriteHeaderInfo();
+ std::string log_fname_; // Current active info log's file name.
+ std::string dbname_;
+ std::string db_log_dir_;
+ std::string db_absolute_path_;
+ std::shared_ptr<FileSystem> fs_;
+ std::shared_ptr<SystemClock> clock_;
+ std::shared_ptr<Logger> logger_;
+ // current status of the logger
+ Status status_;
+ const size_t kMaxLogFileSize;
+ const size_t kLogFileTimeToRoll;
+ const size_t kKeepLogFileNum;
+ // header information
+ std::list<std::string> headers_;
+ // List of all existing info log files. Used for enforcing number of
+ // info log files.
+ // Full path is stored here. It consumes signifianctly more memory
+ // than only storing file name. Can optimize if it causes a problem.
+ std::queue<std::string> old_log_files_;
+ // to avoid frequent clock->NowMicros() calls, we cached the current time
+ uint64_t cached_now;
+ uint64_t ctime_;
+ uint64_t cached_now_access_count;
+ uint64_t call_NowMicros_every_N_records_;
+ IOOptions io_options_;
+ IODebugContext io_context_;
+ mutable port::Mutex mutex_;
+};
+#endif // !ROCKSDB_LITE
+
+// Facade to craete logger automatically
+Status CreateLoggerFromOptions(const std::string& dbname,
+ const DBOptions& options,
+ std::shared_ptr<Logger>* logger);
+
+} // namespace ROCKSDB_NAMESPACE