Added GET List of Camapaign Resources

src/myaktion/handler/campaign.go

@@ -28,3 +28,17 @@ func CreateCampaign(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 }
+
+func GetCampaigns(w http.ResponseWriter, _ *http.Request) {
+	campaigns, err := service.GetCampaigns()
+	if err != nil {
+		log.Printf("Error calling service GetCampaigns: %v", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(campaigns); err != nil {
+		log.Printf("Failure encoding value to JSON: %v", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}

src/myaktion/main.go

@@ -14,6 +14,7 @@ func main() {
 	router := mux.NewRouter()
 	router.HandleFunc("/health", handler.Health).Methods("GET")
 	router.HandleFunc("/campaigns", handler.CreateCampaign).Methods("POST")
+	router.HandleFunc("/campaigns", handler.GetCampaigns).Methods("GET")
 	if err := http.ListenAndServe(":8000", router); err != nil {
 		log.Fatal(err)
 	}

src/myaktion/service/campaign.go

@@ -23,3 +23,12 @@ func CreateCampaign(campaign *model.Campaign) error {
 	log.Printf("Stored: %v", campaign)
 	return nil
 }
+
+func GetCampaigns() ([]model.Campaign, error) {
+	var campaigns []model.Campaign
+	for _, campaign := range campaignStore {
+		campaigns = append(campaigns, *campaign)
+	}
+	log.Printf("Retrieved: %v", campaigns)
+	return campaigns, nil
+}