callbacks service draft

api/edge/callbacks/internal/delivery/classifier.go

@@ -0,0 +1,27 @@
+package delivery
+
+import "net/http"
+
+type outcome string
+
+const (
+	outcomeDelivered outcome = "delivered"
+	outcomeRetry     outcome = "retry"
+	outcomeFailed    outcome = "failed"
+)
+
+func classify(statusCode int, reqErr error) outcome {
+	if reqErr != nil {
+		return outcomeRetry
+	}
+	if statusCode >= http.StatusOK && statusCode < http.StatusMultipleChoices {
+		return outcomeDelivered
+	}
+	if statusCode == http.StatusTooManyRequests || statusCode == http.StatusRequestTimeout {
+		return outcomeRetry
+	}
+	if statusCode >= http.StatusInternalServerError {
+		return outcomeRetry
+	}
+	return outcomeFailed
+}