First gpt batch mode working as usual

main.go

@@ -11,39 +11,38 @@ import (
 	"time"
 )
 
+type VoltageBatch struct {
+	Voltages []float64 `json:"voltages"`
+}
+
 var dataFile *os.File
 var berlinTZ *time.Location
 
-type VoltageData struct {
-	Voltage float64 `json:"voltage"`
-}
-
 func init() {
 	var err error
 	berlinTZ, err = time.LoadLocation("Europe/Berlin")
 	if err != nil {
-		log.Fatalf("Failed to load Berlin timezone: %v", err)
+		log.Fatal(err)
 	}
 }
 
 func initDataFile() {
-	// Ensure the data/ directory exists
-	if err := os.MkdirAll("data", os.ModePerm); err != nil {
-		log.Fatalf("Failed to create data directory: %v", err)
-	}
+	_ = os.MkdirAll("data", 0755)
 
-	// Generate a filename with timestamp in Berlin local time
-	filename := filepath.Join("data", fmt.Sprintf("voltages_%s.csv", time.Now().In(berlinTZ).Format("20060102_150405")))
-	file, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	filename := filepath.Join(
+		"data",
+		fmt.Sprintf("voltages_%s.csv",
+			time.Now().In(berlinTZ).Format("20060102_150405")),
+	)
+
+	f, err := os.OpenFile(filename,
+		os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
 	if err != nil {
-		log.Fatalf("Failed to open data file: %v", err)
+		log.Fatal(err)
 	}
 
-	dataFile = file
-	log.Printf("Logging voltage data to %s\n", filename)
-
-	// Write CSV header
-	_, _ = dataFile.WriteString("timestamp,voltage\n")
+	dataFile = f
+	dataFile.WriteString("timestamp,voltage\n")
 }
 
 func handler(w http.ResponseWriter, r *http.Request) {
@@ -59,24 +58,20 @@ func handler(w http.ResponseWriter, r *http.Request) {
 	}
 	defer r.Body.Close()
 
-	// Parse JSON
-	var v VoltageData
-	if err := json.Unmarshal(body, &v); err != nil {
+	var batch VoltageBatch
+	if err := json.Unmarshal(body, &batch); err != nil {
 		http.Error(w, "invalid JSON", http.StatusBadRequest)
 		return
 	}
 
-	// Get current timestamp in Berlin
-	timestamp := time.Now().In(berlinTZ).Format("2006-01-02 15:04:05.000")
+	start := time.Now().In(berlinTZ)
 
-	// Print voltage to console
-	fmt.Printf("Received voltage: %f at %s\n", v.Voltage, timestamp)
-
-	// Append CSV line to file
-	if dataFile != nil {
-		if _, err := dataFile.WriteString(fmt.Sprintf("%s,%.6f\n", timestamp, v.Voltage)); err != nil {
-			log.Printf("Failed to write to file: %v", err)
-		}
+	for i, v := range batch.Voltages {
+		ts := start.Add(time.Duration(i) * 33 * time.Millisecond)
+		dataFile.WriteString(
+			fmt.Sprintf("%s,%.6f\n",
+				ts.Format("2006-01-02 15:04:05.000"), v),
+		)
 	}
 
 	w.WriteHeader(http.StatusOK)
@@ -89,8 +84,6 @@ func main() {
 
 	http.HandleFunc("/data", handler)
 
-	addr := ":8080"
-	log.Println("Listening on", addr)
-	log.Fatal(http.ListenAndServe(addr, nil))
+	log.Fatal(http.ListenAndServe(":8080", nil))
 }