log.Println("some log") // unconditional log
log.Trace("trace") // log only with `trace` level
log.Tracef("42: %s", "yep") // each method has it's format alternative
log.Debug("debug") // log only with `debug` level and lower
log.Info("info") // log only with `info` level and lower
log.Warning("warn") // log with `warning` level and lower
log.Error("err") // log with `error` and `critical` level
log.Fatal("haha") // log and panic("haha")Log adds --log-level flag to your program:
// main.go
package main
import (
"flag"
"github.com/yanzay/log"
)
func main() {
flag.Parse()
log.Info("info")
}$ go run main.go --help
Usage:
-log-level string
Log level: trace|debug|info|warning|error|critical (default "info")You can set logging level manually by:
log.Level = log.LevelTraceDefaultWriter is just a small wrapper for log package from stdlib.
You can use AsyncWriter to write your logs asynchronously, without blocking you main execution. To use AsyncWriter, just switch it in your code like this:
log.Writer = log.NewAsyncWriter()Also you can use your own log writer:
log.Writer = myWriter // myWriter should implement io.Writer interface