Lightweight, easy-to-use and fast logging library, providing only a front-end for log writing.
Header-only, cross-platform which implemented in C++11. 细节分析
limlog uses the singleton
pattern and is recommended for simple logging scenarios
Usage
Header only, simply include 'limlog.h'.
#include "limlog.h"
int main() {
limlog::singleton()->setLogLevel(limlog::kDebug);
LOG_INFO << 123 << ' ' << 1.23 << ' ' << true << ' ' << "123";
return 0;
}
A logline format as follow:
// +-------+------+-----------+------+------+------------+------+
// | level | time | thread id | logs | file | (function) | line |
// +-------+------+-----------+------+------+------------+------+
// such as:
INFO 2022-02-28T15:45:56.341+08:00 25332 fuck.cpp:4 123 1.230000 true 123
Logging Output
limlog does not provide a rotation utility for logs, which is required for external programs.
But limlog provides an output interface for users to customize.
#include "limlog.h"
// send log info to remote server.
ssize_t send_to_remote(const char *, size_t n) {
// do send
return 0;
}
int main() {
limlog::singleton()->setOutput(send_to_remote);
LOG_INFO << 123 << ' ' << 1.23 << ' ' << true << ' ' << "123";
return 0;
}
Optimization
Time
see https://github.com/zxhio/time_rfc3339.
Thread local cache thread id
Introduce thread_local to avoid race conditions between threads. And reduce the number of gettid system calls
Number to String
Uses search table to optimise integer and peer search can confirm two characters.
TODO
- support more pattern for logging.
- support async process.
Reference
- Iyengar111/NanoLog, Low Latency C++11 Logging Library.
- PlatformLab/NanoLog, Nanolog is an extremely performant nanosecond scale logging system for C++ that exposes a simple printf-like API.
- kfifo, kernel ring buffer.
- itoa-benchmark, some itoa algorithm, limlog uses search table.