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// Copyright 2019 Roman Perepelitsa.
//
// This file is part of GitStatus.
//
// GitStatus is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GitStatus is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
#include "logging.h"
#include <pthread.h>
#include <time.h>
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <mutex>
#include <string>
namespace gitstatus {
namespace internal_logging {
namespace {
std::mutex g_log_mutex;
constexpr char kHexLower[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
void FormatThreadId(char (&out)[2 * sizeof(std::uintptr_t) + 1]) {
std::uintptr_t tid = (std::uintptr_t)pthread_self();
char* p = out + sizeof(out) - 1;
*p = 0;
do {
--p;
*p = kHexLower[tid & 0xF];
tid >>= 4;
} while (p != out);
}
void FormatCurrentTime(char (&out)[64]) {
std::time_t time = std::time(nullptr);
struct tm tm;
if (localtime_r(&time, &tm) != &tm || std::strftime(out, sizeof(out), "%F %T", &tm) == 0) {
std::strcpy(out, "undef");
}
}
} // namespace
LogStreamBase::LogStreamBase(const char* file, int line, LogLevel lvl)
: errno_(errno), file_(file), line_(line), lvl_(LogLevelStr(lvl)) {
strm_ = std::make_unique<std::ostringstream>();
}
void LogStreamBase::Flush() {
{
std::string msg = strm_->str();
char tid[2 * sizeof(std::uintptr_t) + 1];
FormatThreadId(tid);
char time[64];
FormatCurrentTime(time);
std::unique_lock<std::mutex> lock(g_log_mutex);
std::fprintf(stderr, "[%s %s %s %s:%d] %s\n", time, tid, lvl_, file_, line_, msg.c_str());
}
strm_.reset();
errno = errno_;
}
std::ostream& operator<<(std::ostream& strm, Errno e) {
// GNU C Library uses a buffer of 1024 characters for strerror(). Mimic to avoid truncations.
char buf[1024];
auto x = strerror_r(e.err, buf, sizeof(buf));
// There are two versions of strerror_r with different semantics. We can figure out which
// one we've got by looking at the result type.
if (std::is_same<decltype(x), int>::value) {
// XSI-compliant version.
strm << (x ? "unknown error" : buf);
} else if (std::is_same<decltype(x), char*>::value) {
// GNU-specific version.
strm << x;
} else {
// Something else entirely.
strm << "unknown error";
}
return strm;
}
} // namespace internal_logging
LogLevel g_min_log_level = INFO;
const char* LogLevelStr(LogLevel lvl) {
switch (lvl) {
case DEBUG:
return "DEBUG";
case INFO:
return "INFO";
case WARN:
return "WARN";
case ERROR:
return "ERROR";
case FATAL:
return "FATAL";
}
return "UNKNOWN";
}
bool ParseLogLevel(const char* s, LogLevel& lvl) {
if (!s)
return false;
else if (!std::strcmp(s, "DEBUG"))
lvl = DEBUG;
else if (!std::strcmp(s, "INFO"))
lvl = INFO;
else if (!std::strcmp(s, "WARN"))
lvl = WARN;
else if (!std::strcmp(s, "ERROR"))
lvl = ERROR;
else if (!std::strcmp(s, "FATAL"))
lvl = FATAL;
else
return false;
return true;
}
} // namespace gitstatus
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