feat:#39 added fetcher for Events

backend/service/fetch/v3/fetchEvents.go

@@ -0,0 +1,38 @@
+package v3
+
+import (
+	"encoding/json"
+	"log/slog"
+	"net/http"
+)
+
+func parseEvents(url string, client *http.Client) (Events, error) {
+
+	// the url is paginated, so we need to fetch all pages
+	// example url: https://luna.htwk-leipzig.de/api/veranstaltungen?page=1&itemsPerPage=100
+	// the itemsPerPage is set to 100, so we need to fetch all pages until we get an empty response
+
+	var fetchedEvents Events
+	var itemsPerPage = 100
+
+	responses, err := paginatedFetch(url, itemsPerPage, client)
+
+	if err != nil {
+		slog.Error("Error while fetching events", err)
+		return Events{}, err
+	}
+
+	for _, response := range responses {
+		var events Events
+		err = json.Unmarshal([]byte(response), &events)
+		if err != nil {
+			slog.Error("Error while unmarshalling events", err)
+			return Events{}, err
+		}
+
+		fetchedEvents.Events = append(fetchedEvents.Events, events.Events...)
+		fetchedEvents.TotalItems = events.TotalItems
+	}
+
+	return fetchedEvents, nil
+}