add error handling

main.go

@@ -63,6 +63,7 @@ func GenerateAvgVcpusCharts(f *excelize.File, data any, name string) {
 			err = json.Unmarshal(ryde.Interface().(json.RawMessage), &rydeData)
 			if err != nil {
 				fmt.Printf("Error unmarshaling Ryde for %s: %v\n", fieldName, err)
+				return
 			}
 		}
 
@@ -70,6 +71,7 @@ func GenerateAvgVcpusCharts(f *excelize.File, data any, name string) {
 			err = json.Unmarshal(wsdc.Interface().(json.RawMessage), &wsdcData)
 			if err != nil {
 				fmt.Printf("Error unmarshaling Wsdc for %s: %v\n", fieldName, err)
+				return
 			}
 		}
 
@@ -103,12 +105,14 @@ func GenerateCharts(f *excelize.File, data any, name string, location string) {
 		err = json.Unmarshal(rccField.Interface().(json.RawMessage), &rcc)
 		if err != nil {
 			fmt.Printf("Error unmarshaling Ryde: %v\n", err)
+			return
 		}
 	}
 	if len(wsdcField.Interface().(json.RawMessage)) > 0 {
 		err = json.Unmarshal(wsdcField.Interface().(json.RawMessage), &wsdc)
 		if err != nil {
 			fmt.Printf("Error unmarshaling Wsdc: %v\n", err)
+			return
 		}
 	}
 
@@ -151,7 +155,7 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 	// Sort dates using the custom function
 	err = sortDates(dataDates)
 	if err != nil {
-		fmt.Println("Failed to sort dates:", err)
+		fmt.Printf("Failed to sort dates for worksheet %s: %s\n", worksheetName, err)
 		return
 	}
 
@@ -232,7 +236,7 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 			Width:  800,
 		},
 	}); err != nil {
-		fmt.Println(err)
+		fmt.Printf("Error adding chart to workbook %s at location %s: %s\n", worksheetName, location, err)
 		return
 	}
 }
@@ -248,12 +252,14 @@ func main() {
 	f := excelize.NewFile()
 	defer func() {
 		if err := f.Close(); err != nil {
-			fmt.Println(err)
+			fmt.Printf("Error closing excel sheet: %s\n", err)
+			os.Exit(1)
 		}
 	}()
 	err = f.SetSheetName("Sheet1", "Report")
 	if err != nil {
-		log.Fatal(err)
+		fmt.Printf("Error renaming Sheet1: %s\n", err)
+		os.Exit(1)
 	}
 
 	// Load the JSON data from file
@@ -266,7 +272,8 @@ func main() {
 	byteValue, _ := io.ReadAll(file)
 	var data Input
 	if err := json.Unmarshal(byteValue, &data); err != nil {
-		log.Fatal(err)
+		fmt.Printf("Error reading json input: %s\n", err)
+		os.Exit(1)
 	}
 
 	// Generate charts into workbook
@@ -277,7 +284,8 @@ func main() {
 
 	// Save workbook
 	if err := f.SaveAs(*outputFile); err != nil {
-		fmt.Println(err)
+		fmt.Printf("Error saving excel workbook: %s\n", err)
+		os.Exit(1)
 	}
 }