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/*
* Copyright (c) 2014, Peter Thorson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the WebSocket++ Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef WEBSOCKETPP_LOGGER_BASIC_HPP
#define WEBSOCKETPP_LOGGER_BASIC_HPP
/* Need a way to print a message to the log
*
* - timestamps
* - channels
* - thread safe
* - output to stdout or file
* - selective output channels, both compile time and runtime
* - named channels
* - ability to test whether a log message will be printed at compile time
*
*/
#include <websocketpp/logger/levels.hpp>
#include <websocketpp/common/cpp11.hpp>
#include <websocketpp/common/stdint.hpp>
#include <websocketpp/common/time.hpp>
#include <ctime>
#include <iostream>
#include <iomanip>
#include <string>
namespace websocketpp {
namespace log {
/// Basic logger that outputs to an ostream
template <typename concurrency, typename names>
class basic {
public:
basic<concurrency,names>(channel_type_hint::value h =
channel_type_hint::access)
: m_static_channels(0xffffffff)
, m_dynamic_channels(0)
, m_out(h == channel_type_hint::error ? &std::cerr : &std::cout) {}
basic<concurrency,names>(std::ostream * out)
: m_static_channels(0xffffffff)
, m_dynamic_channels(0)
, m_out(out) {}
basic<concurrency,names>(level c, channel_type_hint::value h =
channel_type_hint::access)
: m_static_channels(c)
, m_dynamic_channels(0)
, m_out(h == channel_type_hint::error ? &std::cerr : &std::cout) {}
basic<concurrency,names>(level c, std::ostream * out)
: m_static_channels(c)
, m_dynamic_channels(0)
, m_out(out) {}
/// Destructor
~basic<concurrency,names>() {}
/// Copy constructor
basic<concurrency,names>(basic<concurrency,names> const & other)
: m_static_channels(other.m_static_channels)
, m_dynamic_channels(other.m_dynamic_channels)
, m_out(other.m_out)
{}
#ifdef _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
// no copy assignment operator because of const member variables
basic<concurrency,names> & operator=(basic<concurrency,names> const &) = delete;
#endif // _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
#ifdef _WEBSOCKETPP_MOVE_SEMANTICS_
/// Move constructor
basic<concurrency,names>(basic<concurrency,names> && other)
: m_static_channels(other.m_static_channels)
, m_dynamic_channels(other.m_dynamic_channels)
, m_out(other.m_out)
{}
#ifdef _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
// no move assignment operator because of const member variables
basic<concurrency,names> & operator=(basic<concurrency,names> &&) = delete;
#endif // _WEBSOCKETPP_DEFAULT_DELETE_FUNCTIONS_
#endif // _WEBSOCKETPP_MOVE_SEMANTICS_
void set_ostream(std::ostream * out = &std::cout) {
m_out = out;
}
void set_channels(level channels) {
if (channels == names::none) {
clear_channels(names::all);
return;
}
scoped_lock_type lock(m_lock);
m_dynamic_channels |= (channels & m_static_channels);
}
void clear_channels(level channels) {
scoped_lock_type lock(m_lock);
m_dynamic_channels &= ~channels;
}
/// Write a string message to the given channel
/**
* @param channel The channel to write to
* @param msg The message to write
*/
void write(level channel, std::string const & msg) {
scoped_lock_type lock(m_lock);
if (!this->dynamic_test(channel)) { return; }
*m_out << "[" << timestamp << "] "
<< "[" << names::channel_name(channel) << "] "
<< msg << "\n";
m_out->flush();
}
/// Write a cstring message to the given channel
/**
* @param channel The channel to write to
* @param msg The message to write
*/
void write(level channel, char const * msg) {
scoped_lock_type lock(m_lock);
if (!this->dynamic_test(channel)) { return; }
*m_out << "[" << timestamp << "] "
<< "[" << names::channel_name(channel) << "] "
<< msg << "\n";
m_out->flush();
}
_WEBSOCKETPP_CONSTEXPR_TOKEN_ bool static_test(level channel) const {
return ((channel & m_static_channels) != 0);
}
bool dynamic_test(level channel) {
return ((channel & m_dynamic_channels) != 0);
}
protected:
typedef typename concurrency::scoped_lock_type scoped_lock_type;
typedef typename concurrency::mutex_type mutex_type;
mutex_type m_lock;
private:
// The timestamp does not include the time zone, because on Windows with the
// default registry settings, the time zone would be written out in full,
// which would be obnoxiously verbose.
//
// TODO: find a workaround for this or make this format user settable
static std::ostream & timestamp(std::ostream & os) {
std::time_t t = std::time(NULL);
std::tm lt = lib::localtime(t);
#ifdef _WEBSOCKETPP_PUTTIME_
return os << std::put_time(<,"%Y-%m-%d %H:%M:%S");
#else // Falls back to strftime, which requires a temporary copy of the string.
char buffer[20];
size_t result = std::strftime(buffer,sizeof(buffer),"%Y-%m-%d %H:%M:%S",<);
return os << (result == 0 ? "Unknown" : buffer);
#endif
}
level const m_static_channels;
level m_dynamic_channels;
std::ostream * m_out;
};
} // log
} // websocketpp
#endif // WEBSOCKETPP_LOGGER_BASIC_HPP
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