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package notifiers
import (
"strconv"
"fmt"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/log"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/services/alerting"
)
func init() {
alerting.RegisterNotifier(&alerting.NotifierPlugin{
Type: "kafka",
Name: "Kafka REST Proxy",
Description: "Sends notifications to Kafka Rest Proxy",
Factory: NewKafkaNotifier,
OptionsTemplate: `
<h3 class="page-heading">Kafka settings</h3>
<div class="gf-form">
<span class="gf-form-label width-14">Kafka REST Proxy</span>
<input type="text" required class="gf-form-input max-width-22" ng-model="ctrl.model.settings.kafkaRestProxy" placeholder="http://localhost:8082"></input>
</div>
<div class="gf-form">
<span class="gf-form-label width-14">Topic</span>
<input type="text" required class="gf-form-input max-width-22" ng-model="ctrl.model.settings.kafkaTopic" placeholder="topic1"></input>
</div>
`,
})
}
func NewKafkaNotifier(model *m.AlertNotification) (alerting.Notifier, error) {
endpoint := model.Settings.Get("kafkaRestProxy").MustString()
if endpoint == "" {
return nil, alerting.ValidationError{Reason: "Could not find kafka rest proxy endpoint property in settings"}
}
topic := model.Settings.Get("kafkaTopic").MustString()
if topic == "" {
return nil, alerting.ValidationError{Reason: "Could not find kafka topic property in settings"}
}
return &KafkaNotifier{
NotifierBase: NewNotifierBase(model.Id, model.IsDefault, model.Name, model.Type, model.Settings),
Endpoint: endpoint,
Topic: topic,
log: log.New("alerting.notifier.kafka"),
}, nil
}
type KafkaNotifier struct {
NotifierBase
Endpoint string
Topic string
log log.Logger
}
func (this *KafkaNotifier) Notify(evalContext *alerting.EvalContext) error {
state := evalContext.Rule.State
customData := "Triggered metrics:\n\n"
for _, evt := range evalContext.EvalMatches {
customData = customData + fmt.Sprintf("%s: %v\n", evt.Metric, evt.Value)
}
this.log.Info("Notifying Kafka", "alert_state", state)
recordJSON := simplejson.New()
records := make([]interface{}, 1)
bodyJSON := simplejson.New()
bodyJSON.Set("description", evalContext.Rule.Name+" - "+evalContext.Rule.Message)
bodyJSON.Set("client", "Grafana")
bodyJSON.Set("details", customData)
bodyJSON.Set("incident_key", "alertId-"+strconv.FormatInt(evalContext.Rule.Id, 10))
ruleUrl, err := evalContext.GetRuleUrl()
if err != nil {
this.log.Error("Failed get rule link", "error", err)
return err
}
bodyJSON.Set("client_url", ruleUrl)
if evalContext.ImagePublicUrl != "" {
contexts := make([]interface{}, 1)
imageJSON := simplejson.New()
imageJSON.Set("type", "image")
imageJSON.Set("src", evalContext.ImagePublicUrl)
contexts[0] = imageJSON
bodyJSON.Set("contexts", contexts)
}
valueJSON := simplejson.New()
valueJSON.Set("value", bodyJSON)
records[0] = valueJSON
recordJSON.Set("records", records)
body, _ := recordJSON.MarshalJSON()
topicUrl := this.Endpoint + "/topics/" + this.Topic
cmd := &m.SendWebhookSync{
Url: topicUrl,
Body: string(body),
HttpMethod: "POST",
HttpHeader: map[string]string{
"Content-Type": "application/vnd.kafka.json.v2+json",
"Accept": "application/vnd.kafka.v2+json",
},
}
if err := bus.DispatchCtx(evalContext.Ctx, cmd); err != nil {
this.log.Error("Failed to send notification to Kafka", "error", err, "body", string(body))
return err
}
return nil
}
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