grafana/pkg/services/alerting/notifiers/telegram.go

package notifiers

import (
	"fmt"

	"github.com/grafana/grafana/pkg/bus"
	"github.com/grafana/grafana/pkg/components/simplejson"
	"github.com/grafana/grafana/pkg/log"
	"github.com/grafana/grafana/pkg/metrics"
	m "github.com/grafana/grafana/pkg/models"
	"github.com/grafana/grafana/pkg/services/alerting"
)

var (
	telegeramApiUrl string = "https://api.telegram.org/bot%s/%s"
)

func init() {
	alerting.RegisterNotifier("telegram", NewTelegramNotifier)
}

type TelegramNotifier struct {
	NotifierBase
	BotToken string
	ChatID   string
	log      log.Logger
}

func NewTelegramNotifier(model *m.AlertNotification) (alerting.Notifier, error) {
	if model.Settings == nil {
		return nil, alerting.ValidationError{Reason: "No Settings Supplied"}
	}

	botToken := model.Settings.Get("bottoken").MustString()
	chatId := model.Settings.Get("chatid").MustString()

	if botToken == "" {
		return nil, alerting.ValidationError{Reason: "Could not find Bot Token in settings"}
	}

	if chatId == "" {
		return nil, alerting.ValidationError{Reason: "Could not find Chat Id in settings"}
	}

	return &TelegramNotifier{
		NotifierBase: NewNotifierBase(model.Id, model.IsDefault, model.Name, model.Type, model.Settings),
		BotToken:     botToken,
		ChatID:       chatId,
		log:          log.New("alerting.notifier.telegram"),
	}, nil
}

func (this *TelegramNotifier) Notify(evalContext *alerting.EvalContext) error {
	this.log.Info("Sending alert notification to", "bot_token", this.BotToken)
	this.log.Info("Sending alert notification to", "chat_id", this.ChatID)
	metrics.M_Alerting_Notification_Sent_Telegram.Inc(1)

	bodyJSON := simplejson.New()

	bodyJSON.Set("chat_id", this.ChatID)
	bodyJSON.Set("parse_mode", "html")

	message := fmt.Sprintf("%s\nState: %s\nMessage: %s\n", evalContext.GetNotificationTitle(), evalContext.Rule.Name, evalContext.Rule.Message)

	ruleUrl, err := evalContext.GetRuleUrl()
	if err == nil {
		message = message + fmt.Sprintf("URL: %s\n", ruleUrl)
	}
	bodyJSON.Set("text", message)

	url := fmt.Sprintf(telegeramApiUrl, this.BotToken, "sendMessage")
	body, _ := bodyJSON.MarshalJSON()

	cmd := &m.SendWebhookSync{
		Url:        url,
		Body:       string(body),
		HttpMethod: "POST",
	}

	if err := bus.DispatchCtx(evalContext.Ctx, cmd); err != nil {
		this.log.Error("Failed to send webhook", "error", err, "webhook", this.Name)
		return err
	}

	return nil
}