observer/pkg/gelf_exporter/gelf.go

package gelfexporter

import (
	"fmt"
	"log"
	"maal/tracer/pkg/level"
	"time"

	"gopkg.in/Graylog2/go-gelf.v2/gelf"
)

type GELFMessage struct {
	// Name of the application
	Host string `json:"host"`
	// Short, descriptive message
	ShortMessage string `json:"short_message"`
	// Optional long message.
	LongMessage string `json:"long_message,omitempty"`
	// Timestamp in Unix
	Timestamp time.Time `json:"timestamp"`
	// Severity level matching Syslog standard.
	Level level.SyslogLevel `json:"level"`

	// All additional field names must start with an underline.
	ExtraFields map[string]interface{} `json:"extrafields,omitempty"`
}

func Log(writer *gelf.UDPWriter, msg GELFMessage) {
	if writer != nil {
		err := writer.WriteMessage(msg.GELFFormat())
		if err != nil {
			log.Println(err)
		}
		fmt.Printf("msg: %v sent\n", msg)
	}
}

func (g GELFMessage) GELFFormat() *gelf.Message {
	return &gelf.Message{
		Version:  "1.1",
		Host:     g.Host,
		Short:    g.ShortMessage,
		Full:     g.LongMessage,
		TimeUnix: float64(g.Timestamp.Unix()),
		Level:    int32(g.Level),
		Extra:    g.ExtraFields,
	}
}