libcruft-util/log/log.cpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2012-2016 Danny Robson <danny@nerdcruft.net>
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*/
#include "log.hpp"
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#include "../cast.hpp"
#include "../string.hpp"
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#include "sink/console.hpp"
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#include "sink/ostream.hpp"
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#include <iostream>
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#include <mutex>
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#include <map>
#include <string>
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///////////////////////////////////////////////////////////////////////////////
bool
cruft::log::needs_break (level_t level)
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{
static level_t break_level;
static bool has_level = [&] (void) {
const char *env = getenv ("BREAK_LEVEL");
if (!env)
return false;
try {
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break_level = cruft::log::to_level (env);
return true;
} catch (...) {
return false;
}
} ();
return has_level && level <= break_level;
}
///////////////////////////////////////////////////////////////////////////////
// mingw#xxx: MinGW doesn't have once_flag so we just use an atomic bool.
// Pray that multiple threads don't run into an issue here.
static std::atomic<bool> s_sink_init;
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static std::unique_ptr<cruft::log::sink::base> s_default_sink;
//-----------------------------------------------------------------------------
cruft::log::sink::base&
cruft::log::default_sink (std::unique_ptr<sink::base> value)
{
s_default_sink = std::move (value);
return *s_default_sink;
}
//-----------------------------------------------------------------------------
cruft::log::sink::base&
cruft::log::default_sink ()
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{
if (unlikely (!s_sink_init)) {
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static char const *DEFAULT_SINK = "CONSOLE";
char const *log_sink = getenv ("CRUFT_LOG_SINK") ?: DEFAULT_SINK;
if (!strcmp (log_sink, "FILE")) {
char const *log_path = getenv ("CRUFT_LOG_PATH");
default_sink (
std::make_unique<sink::ostream> (
PACKAGE_NAME,
log_path
)
);
} else if (strcmp (log_sink, "CONSOLE")) {
default_sink (
std::make_unique<sink::console> (PACKAGE_NAME)
);
} else {
std::clog << "Unknown logging sink. Falling back to console.\n";
default_sink (
std::make_unique<sink::console> (PACKAGE_NAME)
);
}
s_sink_init = true;
}
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return *s_default_sink;
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}
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///////////////////////////////////////////////////////////////////////////////
void
cruft::log::write (level_t level, const std::string &msg)
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{
return write (level, std::string_view (msg));
}
//-----------------------------------------------------------------------------
void
cruft::log::write (level_t level, char const *msg)
{
return write (level, std::string_view (msg));
}
//-----------------------------------------------------------------------------
void
cruft::log::write (level_t level, std::string_view msg)
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{
return default_sink ().write (
packet (level, msg)
);
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}