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hook.go
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hook.go
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package logrusmqtt
import (
"encoding/json"
"strings"
"time"
MQTT "github.com/eclipse/paho.mqtt.golang"
"github.com/sirupsen/logrus"
)
// MQTTHook to send logs to the MQTT topic.
type MQTTHook struct {
client MQTT.Client
levels []logrus.Level
topic string
qos int
retain bool
}
// MQTTMsg to create JSON to send MQTT.
type MQTTMsg struct {
Time time.Time `json:"time"`
Level string `json:"level"`
Msg string `json:"msg"`
Data logrus.Fields `json:"data"`
}
type Message struct {
Name string
Body string
Time int64
}
// NewMQTTHook creates new MQTT Hook.
func NewMQTTHook(params MQTTHookParams, level logrus.Level) (*MQTTHook, error) {
opts, err := setMQTTOpts(params)
if err != nil {
return nil, err
}
levels := []logrus.Level{}
for _, l := range []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
logrus.WarnLevel,
logrus.InfoLevel,
logrus.DebugLevel,
logrus.TraceLevel,
} {
if l <= level {
levels = append(levels, l)
}
}
hook := MQTTHook{
client: MQTT.NewClient(opts),
levels: levels,
topic: params.Topic,
qos: params.QoS,
retain: params.Retain,
}
if token := hook.client.Connect(); token.Wait() && token.Error() != nil {
return nil, err
}
return &hook, nil
}
// Fire sends mqtt msg.
func (hook *MQTTHook) Fire(entry *logrus.Entry) error {
level := entry.Level.String()
msg := MQTTMsg{
Time: entry.Time.UTC(),
Level: level,
Msg: entry.Message,
Data: entry.Data,
}
payload, err := json.Marshal(msg)
if err != nil {
return err
}
topic := strings.Join([]string{hook.topic, level}, "/")
hook.client.Publish(topic, byte(hook.qos), hook.retain, string(payload))
// no blocking here
return nil
}
// Levels returns the list of logging levels that we want to send.
func (hook *MQTTHook) Levels() []logrus.Level {
return hook.levels
}