carlware / promtail-go

promtail client in go

promtail golang client

The purpose of this small library is creating a tool for upload logs to grafana loki. The logs looks pretty amazing and awesome, we can have static labels or dynamic labels for filtering while we're debugging.

promtail client for golang services

// create a promtail client
promtail, pErr := client.NewSimpleClient(host, username, password,
    client.WithStaticLabels(map[string]interface{}{
        "app": "awesome-service",
    }),
    client.WithStreamConverter(promtail.NewRawStreamConv(labels, "=")),
)
if pErr != nil {
    panic(pErr)
}

// now can be used as a Writer for any logger

// setup any logger and use as the output, can be combined with many outputs using io.MultiWriter
output := zerolog.ConsoleWriter{Out: promtail}
output.FormatMessage = func(i interface{}) string {
    _, ok := i.(string)
    if ok {
        return fmt.Sprintf("%-50s", i)
    } else {
        return ""
    }
}
output.FormatLevel = func(i interface{}) string {
    _, ok := i.(string)
    if ok {
        return fmt.Sprintf("level=%-7s", i)
    } else {
        return "level=info"
    }
}
log.Logger = log.Output(output)

log.Info().
    Str("my_label", "some_value").
    Msg("the message")