Network: Add WebService

src/Nazara/Network/CurlLibrary.cpp

@@ -0,0 +1,90 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Network module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Network/CurlLibrary.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Core/ErrorFlags.hpp>
+#include <NazaraUtils/CallOnExit.hpp>
+#include <Nazara/Network/Debug.hpp>
+
+namespace Nz
+{
+	bool CurlLibrary::Load()
+	{
+		Unload();
+
+		CallOnExit unloadOnFailure([this] { Unload(); });
+
+		auto PostLoad = [&]
+		{
+			if (global_init(CURL_GLOBAL_DEFAULT) != CURLE_OK)
+			{
+				NazaraError("failed to initialize libcurl");
+				return false;
+			}
+			m_isInitialized = true;
+
+			unloadOnFailure.Reset();
+			return true;
+		};
+
+#ifndef NAZARA_NETWORK_LIBCURL_LINK
+		for (const char* libname : { "libcurl" NAZARA_DYNLIB_EXTENSION, "libcurl-d" NAZARA_DYNLIB_EXTENSION })
+		{
+			ErrorFlags errFlags(Nz::ErrorMode::Silent);
+			if (m_library.Load(libname))
+				break;
+		}
+
+		if (!m_library.IsLoaded())
+		{
+			NazaraError("failed to load libcurl: " + m_library.GetLastError());
+			return false;
+		}
+
+		auto LoadSymbol = [this](const char* name, bool optional)
+		{
+			DynLibFunc funcPtr = m_library.GetSymbol(name);
+			if (!funcPtr && !optional)
+				throw std::runtime_error(std::string("failed to load ") + name);
+
+			return funcPtr;
+		};
+
+		try
+		{
+#define NAZARA_CURL_FUNCTION(name) name = reinterpret_cast<decltype(&::curl_##name)>(LoadSymbol("curl_" #name, false));
+#include <Nazara/Network/CurlFunctions.hpp>
+		}
+		catch (const std::exception& e)
+		{
+			NazaraError(e.what());
+			return false;
+		}
+
+		return PostLoad();
+#else
+		// libcurl is linked to the executable
+
+#define NAZARA_CURL_FUNCTION(name) name = &::curl_##name;
+#include <Nazara/Network/CurlFunctions.hpp>
+
+		return PostLoad();
+#endif
+	}
+
+	void CurlLibrary::Unload()
+	{
+		if (!m_library.IsLoaded())
+			return;
+
+		if (m_isInitialized)
+			global_cleanup();
+
+#define NAZARA_CURL_FUNCTION(name) name = nullptr;
+#include <Nazara/Network/CurlFunctions.hpp>
+
+		m_library.Unload();
+	}
+}