flog

Golang logger:

• Support children loggers / sub loggers, just like Python3 logging
• Based on logrus

Case 1: using different level logger in different package/struct/instance, which is convenient to debug

Case 2: update logger's level dynamically, which is useful for debugging online service. For example:

http.HandleFunc("/debug/log/level", func(rw http.ResponseWriter, r *http.Request) {
    loggerNames, level := parseLogLevel(r)
    Setup(func(l *Logger) {
        l.SetLevel(level)
    }, loggerNames)
})