fetch: simplify fetch + json decode

cmd/fetch/fetch.go

@@ -3,12 +3,13 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io"
 	"log"
 	"net/http"
 	"os"
 )
 
+const UPSTREAM_URL = "https://keyserver.freifunk-franken.de/v2/"
+
 func run() error {
 	var root []root
 
@@ -17,44 +18,26 @@ func run() error {
 		return err
 	}
 
-	req, err := http.NewRequest(http.MethodGet, "https://keyserver.freifunk-franken.de/v2/hoods.php", nil)
+	res, err := http.Get(UPSTREAM_URL + "hoods.php")
 	if err != nil {
 		return err
 	}
+	defer res.Body.Close()
 
-	res, err := http.DefaultClient.Do(req)
+	err = json.NewDecoder(res.Body).Decode(&root)
-	if err != nil {
-		return err
-	}
-
-	body, err := io.ReadAll(res.Body)
-	if err != nil {
-		return err
-	}
-
-	err = json.Unmarshal(body, &root)
 	if err != nil {
 		return err
 	}
 
 	for _, h := range root {
+		res, err := http.Get(fmt.Sprintf("%s/?hoodid=%d", UPSTREAM_URL, h.Id))
+		if err != nil {
+			return err
+		}
+		defer res.Body.Close()
+
 		var hood Hood
-		req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("https://keyserver.freifunk-franken.de/v2/?hoodid=%d", h.Id), nil)
+		err = json.NewDecoder(res.Body).Decode(&hood)
-		if err != nil {
-			return err
-		}
-
-		res, err := http.DefaultClient.Do(req)
-		if err != nil {
-			return err
-		}
-
-		body, err := io.ReadAll(res.Body)
-		if err != nil {
-			return err
-		}
-
-		err = json.Unmarshal(body, &hood)
 		if err != nil {
 			return err
 		}