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Signed-off-by: Rory Z <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package prober | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/go-kit/log" | ||
| "github.com/go-kit/log/level" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| ) | ||
|
|
||
| func Handler(w http.ResponseWriter, r *http.Request, logger log.Logger) { | ||
| // This is a stub function that should be implemented by the user. | ||
| probeSuccessGauge := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Namespace: "emqx", | ||
| Subsystem: "mqtt", | ||
| Name: "probe_success", | ||
| Help: "Displays whether or not the probe was a success", | ||
| }) | ||
| probeDurationGauge := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Namespace: "emqx", | ||
| Subsystem: "mqtt", | ||
| Name: "probe_duration_seconds", | ||
| Help: "Returns how long the probe took to complete in seconds", | ||
| }) | ||
|
|
||
| start := time.Now() | ||
| registry := prometheus.NewRegistry() | ||
| registry.MustRegister(probeSuccessGauge) | ||
| registry.MustRegister(probeDurationGauge) | ||
| success := ProbeMQTT(logger) | ||
| duration := time.Since(start).Seconds() | ||
| probeDurationGauge.Set(duration) | ||
| if success { | ||
| probeSuccessGauge.Set(1) | ||
| level.Info(logger).Log("msg", "Probe succeeded", "duration_seconds", duration) | ||
| } else { | ||
| level.Error(logger).Log("msg", "Probe failed", "duration_seconds", duration) | ||
| } | ||
|
|
||
| h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{}) | ||
| h.ServeHTTP(w, r) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package prober | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
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| mqtt "github.com/eclipse/paho.mqtt.golang" | ||
| "github.com/go-kit/log" | ||
| "github.com/go-kit/log/level" | ||
| ) | ||
|
|
||
| type MQTTProbe struct { | ||
| Client mqtt.Client | ||
| MsgChan <-chan mqtt.Message | ||
| } | ||
|
|
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| var mqttProbe *MQTTProbe | ||
|
|
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| func initMQTTProbe(logger log.Logger) *MQTTProbe { | ||
| opt := mqtt.NewClientOptions().AddBroker("tcp://broker.emqx.io:1883").SetClientID("emqx-exporter") | ||
| opt.SetOnConnectHandler(func(c mqtt.Client) { | ||
| level.Info(logger).Log("msg", "Connected to MQTT broker") | ||
| }) | ||
| opt.SetConnectionLostHandler(func(c mqtt.Client, err error) { | ||
| level.Error(logger).Log("msg", "Lost connection to MQTT broker", "err", err) | ||
| }) | ||
| c := mqtt.NewClient(opt) | ||
| if token := c.Connect(); token.Wait() && token.Error() != nil { | ||
| level.Error(logger).Log("msg", "Failed to connect to MQTT broker", "err", token.Error()) | ||
| panic(token.Error()) | ||
| } | ||
|
|
||
| var msgChan = make(chan mqtt.Message) | ||
| if token := c.Subscribe("emqx-exporter", 1, func(c mqtt.Client, m mqtt.Message) { | ||
| msgChan <- m | ||
| }); token.Wait() && token.Error() != nil { | ||
| level.Error(logger).Log("msg", "Failed to subscribe to MQTT topic", "err", token.Error()) | ||
| panic(token.Error()) | ||
| } | ||
|
|
||
| return &MQTTProbe{ | ||
| Client: c, | ||
| MsgChan: msgChan, | ||
| } | ||
| } | ||
|
|
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| func ProbeMQTT(logger log.Logger) bool { | ||
| if mqttProbe == nil { | ||
| mqttProbe = initMQTTProbe(logger) | ||
| } | ||
|
|
||
| if !mqttProbe.Client.IsConnected() { | ||
| return false | ||
| } | ||
|
|
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| if token := mqttProbe.Client.Publish("emqx-exporter", 1, false, "hello world"); token.Wait() && token.Error() != nil { | ||
| return false | ||
| } | ||
|
|
||
| select { | ||
| case msg := <-mqttProbe.MsgChan: | ||
| if msg == nil { | ||
| return false | ||
| } | ||
| case <-time.After(5 * time.Second): | ||
| return false | ||
| } | ||
|
|
||
| return true | ||
| } |