p2pool: export data to an external web-server

Dumps data to JSON files which can be later served by a web-server.

src/p2pool_api.h

@@ -0,0 +1,85 @@
+/*
+ * This file is part of the Monero P2Pool <https://github.com/SChernykh/p2pool>
+ * Copyright (c) 2021 SChernykh <https://github.com/SChernykh>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "uv_util.h"
+#include <unordered_map>
+
+namespace p2pool {
+
+class p2pool_api
+{
+public:
+	explicit p2pool_api(const std::string& api_path);
+	~p2pool_api();
+
+	enum class Category {
+		NETWORK,
+	};
+
+	void on_stop();
+
+	template<typename T>
+	void set(const Category& category, const char* filename, T&& callback) { dump_to_file_async_internal(category, filename, DumpFileCallback<T>(std::move(callback))); }
+
+private:
+	static void on_dump_to_file(uv_async_t* async) { reinterpret_cast<p2pool_api*>(async->data)->dump_to_file(); }
+
+	struct DumpFileWork {
+		uv_fs_t open_req;
+		uv_fs_t write_req;
+		uv_fs_t close_req;
+
+		std::string name;
+		std::vector<char> buf;
+	};
+
+	struct DumpFileCallbackBase
+	{
+		virtual ~DumpFileCallbackBase() {}
+		virtual void operator()(log::Stream&) = 0;
+	};
+
+	template<typename T>
+	struct DumpFileCallback : public DumpFileCallbackBase
+	{
+		explicit FORCEINLINE DumpFileCallback(T&& callback) : m_callback(std::move(callback)) {}
+		void operator()(log::Stream& s) override { m_callback(s); }
+
+	private:
+		DumpFileCallback& operator=(DumpFileCallback&&) = delete;
+
+		T m_callback;
+	};
+
+	void dump_to_file_async_internal(const Category& category, const char* filename, DumpFileCallbackBase&& callback);
+	void dump_to_file();
+	static void on_fs_open(uv_fs_t* req);
+	static void on_fs_write(uv_fs_t* req);
+	static void on_fs_close(uv_fs_t* req);
+
+	std::string m_apiPath;
+	std::string m_networkPath;
+
+	uv_mutex_t m_dumpDataLock;
+	std::unordered_map<std::string, std::vector<char>> m_dumpData;
+
+	uv_async_t m_dumpToFileAsync;
+};
+
+} // namespace p2pool