add httpGet error handling

src/network/Network.hpp

@@ -9,13 +9,18 @@
 #include "util/Buffer.hpp"
 
 namespace network {
-    using OnResponse = std::function<void(int, std::vector<char>)>;
+    using OnResponse = std::function<void(std::vector<char>)>;
+    using OnReject = std::function<void(const char*)>;
 
     class Http {
     public:
         virtual ~Http() {}
 
-        virtual void get(const std::string& url, const OnResponse& callback) = 0;
+        virtual void get(
+            const std::string& url,
+            OnResponse onResponse,
+            OnReject onReject=nullptr
+        ) = 0;
         virtual size_t getTotalUpload() const = 0;
         virtual size_t getTotalDownload() const = 0;
     };
@@ -26,7 +31,11 @@ namespace network {
         Network(std::unique_ptr<Http> http);
         ~Network();
 
-        void httpGet(const std::string& url, const OnResponse& callback);
+        void httpGet(
+            const std::string& url,
+            OnResponse onResponse,
+            OnReject onReject = nullptr
+        );
 
         size_t getTotalUpload() const;
         size_t getTotalDownload() const;