Initial Notifiers implementation

notifications/types.go

@@ -0,0 +1,44 @@
+package notifications
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net"
+	"net/http"
+	"time"
+)
+
+type Notifiers []Notifier
+
+func (n Notifiers) NotifyWithLog(ctx context.Context, notification Notification) error {
+	var outErr error
+	for _, notifier := range n {
+		if err := notifier.Notify(ctx, notification); err != nil {
+			outErr = errors.Join(outErr, err)
+		}
+		log.Printf("Notification sent via %s\n", notifier.Tag())
+	}
+	return outErr
+}
+
+type Notification struct {
+	OldIp       net.IP    `json:"old_ip,omitempty"`
+	NewIp       net.IP    `json:"new_ip"`
+	CheckedAt   time.Time `json:"checked_at"`
+	ResolverTag string    `json:"resolver_tag"`
+	Domain      string    `json:"domain"`
+}
+
+var Available = map[string]func() (Notifier, error){
+	webhookTag: func() (Notifier, error) {
+		return NewWebhookNotification(NewWebhookConfigFromEnv(), &http.Client{
+			Timeout: 10 * time.Second,
+		}), nil
+	},
+}
+
+type Notifier interface {
+	Tag() string
+	Notify(ctx context.Context, notification Notification) error
+}