New parameter to fetch and send the grid frequency

frequency.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const SwissGridAPI = "https://www.swissgrid.ch/bin/services/apicache?path=/content/swissgrid/fr/home/operation/grid-data/current-data/jcr:content/parsys/livedatawidget_10292"
+
+type SwissGridItem struct {
+	Id           string `json:"id"`
+	Label        string `json:"label"`
+	Value        string `json:"value"`
+	MergeColumns bool   `json:"mergeColumns"`
+	IsLabelBold  bool   `json:"isLabelBold"`
+	IsValueBold  bool   `json:"isValueBold"`
+}
+type SwissGridMaker struct {
+	Id              string  `json:"id"`
+	X               float64 `json:"x"`
+	Y               float64 `json:"y"`
+	Text1           string  `json:"text1"`
+	Text2           string  `json:"text2"`
+	TextColor       string  `json:"textColor"`
+	BackgroundColor string  `json:"backgroundColor"`
+	BorderColor     string  `json:"borderColor"`
+	Type            string  `json:"type"`
+	Direction       string  `json:"direction"`
+	Rotation        *string `json:"rotation"`
+	Opacity         float64 `json:"opacity"`
+	FontSizeDesktop string  `json:"fontSizeDesktop"`
+	FontSizeTablet  string  `json:"fontSizeTablet"`
+	FontSizePhone   string  `json:"fontSizePhone"`
+}
+
+type SwissGridData struct {
+	Data struct {
+		Table  []SwissGridItem `json:"table"`
+		Marker []SwissGridItem `json:"marker"`
+	} `json:"data"`
+}
+
+func FetchFrequency() (*SwissGridData, error) {
+	res, err := http.Get(SwissGridAPI)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode > 299 {
+		return nil, fmt.Errorf("Response failed with status code: %d", res.StatusCode)
+	}
+
+	dec := json.NewDecoder(res.Body)
+	var data SwissGridData
+	err = dec.Decode(&data)
+	if err != nil {
+		return nil, err
+	}
+
+	return &data, err
+}
+
+func WriteFrequency(writer TICWriter, freq *SwissGridData) error {
+	for _, i := range freq.Data.Table {
+		if i.Id == "FreqAct" {
+			f, err := strconv.ParseFloat(strings.Fields(i.Value)[0], 64)
+			if err != nil {
+				return err
+			}
+
+			point := Point{
+				Data: []byte(fmt.Sprintf("%.0f", f*1000)),
+			}
+
+			err = writer.AddPoints(
+				map[string]Point{
+					"FREQ": point,
+				},
+				time.Now(),
+			)
+			if err != nil {
+				log.Println("Unable to write frequency point:", err)
+			}
+
+			break
+		}
+	}
+
+	return nil
+}