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package logging
import "os"
func Example() {
// This call is for testing purposes and will set the time to unix epoch.
InitForTesting(DEBUG)
var log = MustGetLogger("example")
// For demo purposes, create two backend for os.Stdout.
//
// os.Stderr should most likely be used in the real world but then the
// "Output:" check in this example would not work.
backend1 := NewLogBackend(os.Stdout, "", 0)
backend2 := NewLogBackend(os.Stdout, "", 0)
// For messages written to backend2 we want to add some additional
// information to the output, including the used log level and the name of
// the function.
var format = MustStringFormatter(
`%{time:15:04:05.000} %{shortfunc} %{level:.1s} %{message}`,
)
backend2Formatter := NewBackendFormatter(backend2, format)
// Only errors and more severe messages should be sent to backend2
backend2Leveled := AddModuleLevel(backend2Formatter)
backend2Leveled.SetLevel(ERROR, "")
// Set the backends to be used and the default level.
SetBackend(backend1, backend2Leveled)
log.Debugf("debug %s", "arg")
log.Error("error")
// Output:
// debug arg
// error
// 00:00:00.000 Example E error
}
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