add Network.httpGet (WIP)

src/network/Network.cpp

@@ -0,0 +1,60 @@
+#include "Network.hpp"
+
+#include <curl/curl.h>
+#include <stdexcept>
+
+#include "debug/Logger.hpp"
+
+using namespace network;
+
+static debug::Logger logger("network");
+
+size_t write_callback(char* ptr, size_t size, size_t nmemb, void* userdata) {
+    auto& buffer = *reinterpret_cast<std::vector<char>*>(userdata);
+    size_t psize = buffer.size();
+    buffer.resize(psize + size * nmemb);
+    std::memcpy(buffer.data() + psize, ptr, size * nmemb);
+    return size * nmemb;
+}
+
+class CurlHttp : public Http {
+    CURL* curl;
+public:
+    CurlHttp(CURL* curl) : curl(curl) {
+    }
+
+    virtual ~CurlHttp() {
+        curl_easy_cleanup(curl);
+    }
+
+    void get(const std::string& url, const OnResponse& callback) override {
+        std::vector<char> buffer;
+        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        CURLcode res = curl_easy_perform(curl);
+        callback(res, std::move(buffer));
+    }
+
+    static std::unique_ptr<CurlHttp> create() {
+        if (auto curl = curl_easy_init()) {
+            return std::make_unique<CurlHttp>(curl);
+        }
+        throw std::runtime_error("could not initialzie cURL");
+    }
+};
+
+
+Network::Network(std::unique_ptr<Http> http) : http(std::move(http)) {
+}
+
+Network::~Network() = default;
+
+void Network::httpGet(const std::string& url, const OnResponse& callback) {
+    http->get(url, callback);
+}
+
+std::unique_ptr<Network> Network::create(const NetworkSettings& settings) {
+    auto http = CurlHttp::create();
+    return std::make_unique<Network>(std::move(http));
+}

src/network/Network.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <functional>
+
+#include "typedefs.hpp"
+#include "settings.hpp"
+#include "util/Buffer.hpp"
+
+namespace network {
+    using OnResponse = std::function<void(int, std::vector<char>)>;
+
+    class Http {
+    public:
+        virtual ~Http() {}
+
+        virtual void get(const std::string& url, const OnResponse& callback) = 0;
+    };
+
+    class Network {
+        std::unique_ptr<Http> http;
+    public:
+        Network(std::unique_ptr<Http> http);
+        ~Network();
+
+        void httpGet(const std::string& url, const OnResponse& callback);
+
+        static std::unique_ptr<Network> create(const NetworkSettings& settings);
+    };
+}

src/settings.hpp

@@ -81,6 +81,9 @@ struct UiSettings {
     IntegerSetting worldPreviewSize {64, 1, 512};
 };
 
+struct NetworkSettings {
+};
+
 struct EngineSettings {
     AudioSettings audio;
     DisplaySettings display;
@@ -89,4 +92,5 @@ struct EngineSettings {
     GraphicsSettings graphics;
     DebugSettings debug;
     UiSettings ui;
+    NetworkSettings network;
 };