refactoring

lib/fetcher.go

@@ -0,0 +1,21 @@
+package lib
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// Fetcher is the interface for a fetcher.
+type Fetcher interface {
+	Fetch() []string
+}
+
+func getJSON(req *http.Request, target interface{}) error {
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	return json.NewDecoder(res.Body).Decode(target)
+}