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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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187 lines
4.0 KiB
187 lines
4.0 KiB
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9 years ago
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/*
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* Copyright (c) 2013-2016, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef LOG_H__
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#define LOG_H__
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#include <ctime>
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <chrono>
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#include <memory>
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#include <thread>
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#include "Queue.h"
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#ifndef _WIN32
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#include <syslog.h>
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#endif
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enum LogLevel
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{
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eLogError = 0,
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eLogWarning,
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eLogInfo,
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eLogDebug,
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eNumLogLevels
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};
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enum LogType {
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eLogStdout = 0,
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eLogStream,
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eLogFile,
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#ifndef _WIN32
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eLogSyslog,
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#endif
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};
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namespace i2p {
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namespace log {
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struct LogMsg; /* forward declaration */
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class Log
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{
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private:
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enum LogType m_Destination;
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enum LogLevel m_MinLevel;
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std::shared_ptr<std::ostream> m_LogStream;
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std::string m_Logfile;
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std::time_t m_LastTimestamp;
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char m_LastDateTime[64];
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i2p::util::Queue<std::shared_ptr<LogMsg> > m_Queue;
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bool m_HasColors;
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volatile bool m_IsRunning;
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std::thread * m_Thread;
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private:
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/** prevent making copies */
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Log (const Log &);
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const Log& operator=(const Log&);
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void Run ();
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void Process (std::shared_ptr<LogMsg> msg);
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/**
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* @brief Makes formatted string from unix timestamp
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* @param ts Second since epoch
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*
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* This function internally caches the result for last provided value
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*/
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const char * TimeAsString(std::time_t ts);
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public:
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Log ();
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~Log ();
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LogType GetLogType () { return m_Destination; };
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LogLevel GetLogLevel () { return m_MinLevel; };
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void Start ();
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void Stop ();
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/**
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* @brief Sets minimal allowed level for log messages
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* @param level String with wanted minimal msg level
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*/
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void SetLogLevel (const std::string& level);
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/**
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* @brief Sets log destination to logfile
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* @param path Path to logfile
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*/
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void SendTo (const std::string &path);
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/**
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* @brief Sets log destination to given output stream
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* @param os Output stream
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*/
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void SendTo (std::shared_ptr<std::ostream> os);
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#ifndef _WIN32
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/**
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* @brief Sets log destination to syslog
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* @param name Wanted program name
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* @param facility Wanted log category
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*/
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void SendTo (const char *name, int facility);
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#endif
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/**
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* @brief Format log message and write to output stream/syslog
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* @param msg Pointer to processed message
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*/
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void Append(std::shared_ptr<i2p::log::LogMsg> &);
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/** @brief Reopen log file */
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void Reopen();
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};
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/**
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* @struct LogMsg
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* @brief Log message container
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*
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* We creating it somewhere with LogPrint(),
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* then put in MsgQueue for later processing.
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*/
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struct LogMsg {
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std::time_t timestamp;
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std::string text; /**< message text as single string */
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LogLevel level; /**< message level */
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std::thread::id tid; /**< id of thread that generated message */
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LogMsg (LogLevel lvl, std::time_t ts, const std::string & txt): timestamp(ts), text(txt), level(lvl) {};
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};
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Log & Logger();
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} // log
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}
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/** internal usage only -- folding args array to single string */
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template<typename TValue>
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void LogPrint (std::stringstream& s, TValue&& arg) noexcept
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{
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s << std::forward<TValue>(arg);
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}
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/** internal usage only -- folding args array to single string */
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template<typename TValue, typename... TArgs>
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void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
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{
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LogPrint (s, std::forward<TValue>(arg));
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LogPrint (s, std::forward<TArgs>(args)...);
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}
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/**
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* @brief Create log message and send it to queue
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* @param level Message level (eLogError, eLogInfo, ...)
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* @param args Array of message parts
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*/
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template<typename... TArgs>
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void LogPrint (LogLevel level, TArgs&&... args) noexcept
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{
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i2p::log::Log &log = i2p::log::Logger();
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if (level > log.GetLogLevel ())
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return;
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// fold message to single string
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std::stringstream ss("");
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LogPrint (ss, std::forward<TArgs>(args)...);
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auto msg = std::make_shared<i2p::log::LogMsg>(level, std::time(nullptr), ss.str());
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msg->tid = std::this_thread::get_id();
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log.Append(msg);
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}
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#endif // LOG_H__
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