feat:#150 added slog for more functions and improved return signature

backend/service/fetch/sport/sportFetcher.go

@@ -8,6 +8,8 @@ import (
 	"htwkalender/model"
 	"htwkalender/service/db"
 	"htwkalender/service/functions"
+	"io"
+	"log/slog"
 	"net/http"
 	"regexp"
 	"strconv"
@@ -21,9 +23,14 @@ import (
 // FetchAndUpdateSportEvents fetches all sport events from the HTWK sport website
 // it deletes them first and then saves them to the database
 // It returns all saved events
-func FetchAndUpdateSportEvents(app *pocketbase.PocketBase) []model.Event {
+func FetchAndUpdateSportEvents(app *pocketbase.PocketBase) ([]model.Event, error) {
+
+	sportCourseLinks, err := fetchAllAvailableSportCourses()
+
+	if err != nil {
+		return nil, err
+	}
 
-	var sportCourseLinks = fetchAllAvailableSportCourses()
 	sportEntries := fetchHTWKSportCourses(sportCourseLinks)
 	events := formatEntriesToEvents(sportEntries)
 
@@ -43,7 +50,7 @@ func FetchAndUpdateSportEvents(app *pocketbase.PocketBase) []model.Event {
 	// get all events from database where name = Feiertage und lehrveranstaltungsfreie Tage
 	holidays, err := db.GetAllModulesByNameAndDateRange(app, "Feiertage und lehrveranstaltungsfreie Tage", earliestDate, latestDate)
 	if err != nil {
-		return nil
+		return nil, err
 	}
 
 	// remove all events that have same year, month and day as items in holidays
@@ -60,17 +67,17 @@ func FetchAndUpdateSportEvents(app *pocketbase.PocketBase) []model.Event {
 	// @TODO: delete and save events in one transaction and it only should delete events that are not in the new events list and save events that are not in the database
 	err = db.DeleteAllEventsForCourse(app, "Sport", functions.GetCurrentSemesterString())
 	if err != nil {
-		return nil
+		return nil, err
 	}
 
 	// save events to database
 	savedEvents, err := db.SaveEvents(events, app)
 
 	if err != nil {
-		return nil
+		return nil, err
 	}
 
-	return savedEvents
+	return savedEvents, nil
 
 }
 
@@ -305,13 +312,14 @@ func checkSemester(date time.Time) string {
 }
 
 // fetch the main page where all sport courses are listed and extract all links to the sport courses
-func fetchAllAvailableSportCourses() []string {
+func fetchAllAvailableSportCourses() ([]string, error) {
 	var url = "https://sport.htwk-leipzig.de/sportangebote"
 
 	var doc, err = htmlRequest(url)
 
 	if err != nil {
-		return nil
+		slog.Error("Error while fetching sport courses from webpage", err)
+		return nil, err
 	}
 
 	// link list of all sport courses
@@ -325,7 +333,7 @@ func fetchAllAvailableSportCourses() []string {
 		}
 	})
 
-	return links
+	return links, nil
 }
 
 // fetchAllHTWKSportCourses fetches all sport courses from the given links.
@@ -372,7 +380,13 @@ func htmlRequest(url string) (*goquery.Document, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer resp.Body.Close()
+	defer func(Body io.ReadCloser) {
+		readErr := Body.Close()
+		if readErr != nil {
+			slog.Error("Error while closing response body from html request", readErr)
+			return
+		}
+	}(resp.Body)
 
 	doc, err := goquery.NewDocumentFromReader(resp.Body)
 	if err != nil {