added basic error handling

Signed-off-by: metonymic-smokey <[email protected]>

async.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"net/http"
 	"time"
 
@@ -12,7 +13,15 @@ import (
 
 func recordMetrics() {
 	for {
-		dat := getTempData()
+		dat, err := getTempData()
+		if err != nil {
+			fmt.Println(err)
+			time.Sleep(2 * time.Second)
+			continue
+		}
+		if len(dat.Data.Timestep) == 0 {
+			continue
+		}
 
 		for _, interval := range dat.Data.Timestep[0].TempVal {
 			jobsInQueue.Set(interval.Values.Temp)
@@ -54,7 +63,6 @@ func prometheusMiddleware(next http.Handler) http.Handler {
 }
 
 func main() {
-
 	go recordMetrics()
 
 	router := mux.NewRouter()

sync.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"math/rand"
 	"net/http"
@@ -19,7 +20,15 @@ func (c *CityStats) TemperatureAndHumidity() (
 ) {
 	// get real time API temp data here
 	tempByCity = make(map[string]float64)
-	dat := getTempData()
+	dat, err := getTempData()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	if len(dat.Data.Timestep) == 0 {
+		return
+	}
+
 	cities := []string{"bangalore", "london"}
 
 	for ind, interval := range dat.Data.Timestep[0].TempVal {

temp.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -31,20 +32,29 @@ type Response struct {
 	Data Timelines `json:"data"`
 }
 
-func getTempData() Response {
+func getTempData() (Response, error) {
 	url := fmt.Sprintf("https://api.tomorrow.io/v4/timelines?location=%f,%f&fields=temperature&timesteps=%s&units=%s", 73.98529171943665, 40.75872069597532, "1h", "metric")
 
-	req, _ := http.NewRequest("GET", url, nil)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return Response{}, errors.New("error in GET request")
+	}
 	req.Header.Add("apikey", "APIKEY")
-	res, _ := http.DefaultClient.Do(req)
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return Response{}, err
+	}
 	defer res.Body.Close()
 
-	body, _ := ioutil.ReadAll(res.Body)
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return Response{}, errors.New("error reading response")
+	}
 
 	var dat Response
 	if err := json.Unmarshal(body, &dat); err != nil {
-		panic(err)
+		return Response{}, errors.New("error unmarshalling JSON")
 	}
 
-	return dat
+	return dat, nil
 }