| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef LIB_COMMON_LOGGING_H_ |
| #define LIB_COMMON_LOGGING_H_ |
| |
| #include "hdfspp/log.h" |
| |
| #include <boost/asio/ip/tcp.hpp> |
| |
| #include <sstream> |
| #include <mutex> |
| #include <memory> |
| #include <thread> |
| |
| namespace hdfs { |
| |
| /** |
| * Logging mechanism to provide lightweight logging to stderr as well as |
| * as a callback mechanism to allow C clients and larger third party libs |
| * to be used to handle logging. When adding a new log message to the |
| * library use the macros defined below (LOG_TRACE..LOG_ERROR) rather than |
| * using the LogMessage and LogManager objects directly. |
| **/ |
| |
| enum LogLevel { |
| kTrace = 0, |
| kDebug = 1, |
| kInfo = 2, |
| kWarning = 3, |
| kError = 4, |
| }; |
| |
| enum LogSourceComponent { |
| kUnknown = 1 << 0, |
| kRPC = 1 << 1, |
| kBlockReader = 1 << 2, |
| kFileHandle = 1 << 3, |
| kFileSystem = 1 << 4, |
| kAsyncRuntime = 1 << 5, |
| }; |
| |
| #define LOG_TRACE(C, MSG) do { \ |
| if(LogManager::ShouldLog(kTrace,C)) { \ |
| LogMessage(kTrace, __FILE__, __LINE__, C) MSG; \ |
| }} while (0); |
| |
| |
| #define LOG_DEBUG(C, MSG) do { \ |
| if(LogManager::ShouldLog(kDebug,C)) { \ |
| LogMessage(kDebug, __FILE__, __LINE__, C) MSG; \ |
| }} while (0); |
| |
| #define LOG_INFO(C, MSG) do { \ |
| if(LogManager::ShouldLog(kInfo,C)) { \ |
| LogMessage(kInfo, __FILE__, __LINE__, C) MSG; \ |
| }} while (0); |
| |
| #define LOG_WARN(C, MSG) do { \ |
| if(LogManager::ShouldLog(kWarning,C)) { \ |
| LogMessage(kWarning, __FILE__, __LINE__, C) MSG; \ |
| }} while (0); |
| |
| #define LOG_ERROR(C, MSG) do { \ |
| if(LogManager::ShouldLog(kError,C)) { \ |
| LogMessage(kError, __FILE__, __LINE__, C) MSG; \ |
| }} while (0); |
| |
| |
| class LogMessage; |
| |
| class LoggerInterface { |
| public: |
| LoggerInterface() {}; |
| virtual ~LoggerInterface() {}; |
| |
| /** |
| * User defined handling messages, common case would be printing somewhere. |
| **/ |
| virtual void Write(const LogMessage& msg) = 0; |
| }; |
| |
| /** |
| * StderrLogger unsuprisingly dumps messages to stderr. |
| * This is the default logger if nothing else is explicitly set. |
| **/ |
| class StderrLogger : public LoggerInterface { |
| public: |
| StderrLogger() : show_timestamp_(true), show_level_(true), |
| show_thread_(true), show_component_(true), |
| show_file_(true) {} |
| void Write(const LogMessage& msg); |
| void set_show_timestamp(bool show); |
| void set_show_level(bool show); |
| void set_show_thread(bool show); |
| void set_show_component(bool show); |
| private: |
| bool show_timestamp_; |
| bool show_level_; |
| bool show_thread_; |
| bool show_component_; |
| bool show_file_; |
| }; |
| |
| |
| /** |
| * LogManager provides a thread safe static interface to the underlying |
| * logger implementation. |
| **/ |
| class LogManager { |
| friend class LogMessage; |
| public: |
| // allow easy inlining |
| static bool ShouldLog(LogLevel level, LogSourceComponent source) { |
| std::lock_guard<std::mutex> impl_lock(impl_lock_); |
| if(level < level_threshold_) |
| return false; |
| if(!(source & component_mask_)) |
| return false; |
| return true; |
| } |
| static void Write(const LogMessage & msg); |
| static void EnableLogForComponent(LogSourceComponent c); |
| static void DisableLogForComponent(LogSourceComponent c); |
| static void SetLogLevel(LogLevel level); |
| static void SetLoggerImplementation(std::unique_ptr<LoggerInterface> impl); |
| |
| private: |
| // don't create instances of this |
| LogManager(); |
| // synchronize all unsafe plugin calls |
| static std::mutex impl_lock_; |
| static std::unique_ptr<LoggerInterface> logger_impl_; |
| // component and level masking |
| static uint32_t component_mask_; |
| static uint32_t level_threshold_; |
| }; |
| |
| /** |
| * LogMessage contains message text, along with other metadata about the message. |
| * Note: For performance reasons a set of macros (see top of file) is used to |
| * create these inside of an if block. Do not instantiate these directly, doing |
| * so will cause the message to be uncontitionally logged. This minor inconvinience |
| * gives us a ~20% performance increase in the (common) case where few messages |
| * are worth logging; std::stringstream is expensive to construct. |
| **/ |
| class LogMessage { |
| friend class LogManager; |
| public: |
| LogMessage(const LogLevel &l, const char *file, int line, |
| LogSourceComponent component = kUnknown) : |
| level_(l), component_(component), origin_file_(file), origin_line_(line){} |
| |
| ~LogMessage(); |
| |
| const char *level_string() const; |
| const char *component_string() const; |
| LogLevel level() const {return level_; } |
| LogSourceComponent component() const {return component_; } |
| int file_line() const {return origin_line_; } |
| const char * file_name() const {return origin_file_; } |
| |
| //print as-is, indicates when a nullptr was passed in |
| LogMessage& operator<<(const char *); |
| LogMessage& operator<<(const std::string*); |
| LogMessage& operator<<(const std::string&); |
| |
| //convert to a string "true"/"false" |
| LogMessage& operator<<(bool); |
| |
| //integral types |
| LogMessage& operator<<(int32_t); |
| LogMessage& operator<<(uint32_t); |
| LogMessage& operator<<(int64_t); |
| LogMessage& operator<<(uint64_t); |
| |
| //print address as hex |
| LogMessage& operator<<(void *); |
| |
| //asio types |
| LogMessage& operator<<(const boost::asio::ip::tcp::endpoint& endpoint); |
| |
| //thread and mutex types |
| LogMessage& operator<<(const std::thread::id& tid); |
| |
| |
| std::string MsgString() const; |
| |
| private: |
| LogLevel level_; |
| LogSourceComponent component_; |
| const char *origin_file_; |
| const int origin_line_; |
| std::stringstream msg_buffer_; |
| }; |
| |
| } |
| |
| #endif |