pkg/config/static/static_config.go

@@ -108,6 +108,7 @@ type CertificateResolver struct {
 type Global struct {
 	CheckNewVersion    bool `description:"Periodically check if a new version has been released." json:"checkNewVersion,omitempty" toml:"checkNewVersion,omitempty" yaml:"checkNewVersion,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	SendAnonymousUsage bool `description:"Periodically send anonymous usage statistics. If the option is not specified, it will be disabled by default." json:"sendAnonymousUsage,omitempty" toml:"sendAnonymousUsage,omitempty" yaml:"sendAnonymousUsage,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
+	UpdaterCallbacks   []string `description:"Callback urls for updater script (example: https://localhost:8080/callback)" json:"updaterCallbacks,omitempty" toml:"updaterCallbacks,omitempty" yaml:"updaterCallbacks,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 }
 
 // ServersTransport options to configure communication between Traefik and the servers.

pkg/updater/provider.go

@@ -0,0 +1,49 @@
+package updater
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/traefik/v3/pkg/config/dynamic"
+	"github.com/traefik/traefik/v3/pkg/config/static"
+	"github.com/traefik/traefik/v3/pkg/safe"
+)
+
+type Updater struct {
+	callbackUrls []string
+}
+
+func New(config *static.Configuration) *Updater {
+	updater := &Updater{
+		callbackUrls: config.Global.UpdaterCallbacks,
+	}
+
+	return updater
+}
+
+func (u *Updater) HandleConfigUpdate(cfg dynamic.Configuration) {
+	body, err := json.Marshal(cfg)
+
+	if err != nil {
+		// should never happen?
+		log.Error().Err(err).Msg("Error while marshalling dynamic configuration data to json")
+		return
+	}
+
+	requestBody := bytes.NewBuffer(body)
+
+	for _, url := range u.callbackUrls {
+		safe.Go(func() {
+			resp, err := http.Post(url, "application/json", requestBody)
+
+			if err != nil {
+				log.Error().Err(err).Str("url", url).Msg("Error while sending configuration data to callback")
+			} else  {
+				log.Debug().Str("url", url).Msg("Configuration data sent")
+				resp.Body.Close()
+			}
+		})
+	}
+}