/
discord.go
225 lines (192 loc) · 5.45 KB
/
discord.go
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package notifiers
import (
"bytes"
"fmt"
"io"
"mime/multipart"
"os"
"strconv"
"strings"
"github.com/famarks/grafarg/pkg/bus"
"github.com/famarks/grafarg/pkg/components/simplejson"
"github.com/famarks/grafarg/pkg/infra/log"
"github.com/famarks/grafarg/pkg/models"
"github.com/famarks/grafarg/pkg/services/alerting"
"github.com/famarks/grafarg/pkg/setting"
)
func init() {
alerting.RegisterNotifier(&alerting.NotifierPlugin{
Type: "discord",
Name: "Discord",
Description: "Sends notifications to Discord",
Factory: newDiscordNotifier,
Heading: "Discord settings",
Options: []alerting.NotifierOption{
{
Label: "Message Content",
Description: "Mention a group using @ or a user using <@ID> when notifying in a channel",
Element: alerting.ElementTypeInput,
InputType: alerting.InputTypeText,
PropertyName: "content",
},
{
Label: "Webhook URL",
Element: alerting.ElementTypeInput,
InputType: alerting.InputTypeText,
Placeholder: "Discord webhook URL",
PropertyName: "url",
Required: true,
},
},
})
}
func newDiscordNotifier(model *models.AlertNotification) (alerting.Notifier, error) {
content := model.Settings.Get("content").MustString()
url := model.Settings.Get("url").MustString()
if url == "" {
return nil, alerting.ValidationError{Reason: "Could not find webhook url property in settings"}
}
return &DiscordNotifier{
NotifierBase: NewNotifierBase(model),
Content: content,
WebhookURL: url,
log: log.New("alerting.notifier.discord"),
}, nil
}
// DiscordNotifier is responsible for sending alert
// notifications to discord.
type DiscordNotifier struct {
NotifierBase
Content string
WebhookURL string
log log.Logger
}
// Notify send an alert notification to Discord.
func (dn *DiscordNotifier) Notify(evalContext *alerting.EvalContext) error {
dn.log.Info("Sending alert notification to", "webhook_url", dn.WebhookURL)
ruleURL, err := evalContext.GetRuleURL()
if err != nil {
dn.log.Error("Failed get rule link", "error", err)
return err
}
bodyJSON := simplejson.New()
bodyJSON.Set("username", "Grafarg")
if dn.Content != "" {
bodyJSON.Set("content", dn.Content)
}
fields := make([]map[string]interface{}, 0)
for _, evt := range evalContext.EvalMatches {
fields = append(fields, map[string]interface{}{
// Discord uniquely does not send the alert if the metric field is empty,
// which it can be in some cases
"name": notEmpty(evt.Metric),
"value": evt.Value.FullString(),
"inline": true,
})
}
footer := map[string]interface{}{
"text": "Grafarg v" + setting.BuildVersion,
"icon_url": "https://grafarg.com/assets/img/fav32.png",
}
color, _ := strconv.ParseInt(strings.TrimLeft(evalContext.GetStateModel().Color, "#"), 16, 0)
embed := simplejson.New()
embed.Set("title", evalContext.GetNotificationTitle())
// Discord takes integer for color
embed.Set("color", color)
embed.Set("url", ruleURL)
embed.Set("description", evalContext.Rule.Message)
embed.Set("type", "rich")
embed.Set("fields", fields)
embed.Set("footer", footer)
var image map[string]interface{}
var embeddedImage = false
if dn.NeedsImage() {
if evalContext.ImagePublicURL != "" {
image = map[string]interface{}{
"url": evalContext.ImagePublicURL,
}
embed.Set("image", image)
} else {
image = map[string]interface{}{
"url": "attachment://graph.png",
}
embed.Set("image", image)
embeddedImage = true
}
}
bodyJSON.Set("embeds", []interface{}{embed})
json, _ := bodyJSON.MarshalJSON()
cmd := &models.SendWebhookSync{
Url: dn.WebhookURL,
HttpMethod: "POST",
ContentType: "application/json",
}
if !embeddedImage {
cmd.Body = string(json)
} else {
err := dn.embedImage(cmd, evalContext.ImageOnDiskPath, json)
if err != nil {
dn.log.Error("failed to embed image", "error", err)
return err
}
}
if err := bus.DispatchCtx(evalContext.Ctx, cmd); err != nil {
dn.log.Error("Failed to send notification to Discord", "error", err)
return err
}
return nil
}
func (dn *DiscordNotifier) embedImage(cmd *models.SendWebhookSync, imagePath string, existingJSONBody []byte) error {
// nolint:gosec
// We can ignore the gosec G304 warning on this one because `imagePath` comes
// from the alert `evalContext` that generates the images.
f, err := os.Open(imagePath)
if err != nil {
if os.IsNotExist(err) {
cmd.Body = string(existingJSONBody)
return nil
}
if !os.IsNotExist(err) {
return err
}
}
defer func() {
if err := f.Close(); err != nil {
dn.log.Warn("Failed to close file", "path", imagePath, "err", err)
}
}()
var b bytes.Buffer
w := multipart.NewWriter(&b)
defer func() {
if err := w.Close(); err != nil {
// Should be OK since we already close it on non-error path
dn.log.Warn("Failed to close multipart writer", "err", err)
}
}()
fw, err := w.CreateFormField("payload_json")
if err != nil {
return err
}
if _, err = fw.Write([]byte(string(existingJSONBody))); err != nil {
return err
}
fw, err = w.CreateFormFile("file", "graph.png")
if err != nil {
return err
}
if _, err = io.Copy(fw, f); err != nil {
return err
}
if err := w.Close(); err != nil {
return fmt.Errorf("failed to close multipart writer: %w", err)
}
cmd.Body = b.String()
cmd.ContentType = w.FormDataContentType()
return nil
}
func notEmpty(metric string) string {
if metric == "" {
return "<NO_METRIC_NAME>"
}
return metric
}