http_server.hpp

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#pragma once
 
#include <atomic>
#include <boost/asio.hpp>
#include <boost/beast.hpp>
 
#include "common/types.hpp"
#include "logger/logger.hpp"
#include "metrics/jsonrpc_metrics.hpp"
 
namespace taraxa::net {
 
class HttpProcessor {
 public:
  using Request = boost::beast::http::request<boost::beast::http::string_body>;
  using Response = boost::beast::http::response<boost::beast::http::string_body>;
 
  virtual Response process(const Request& request) = 0;
};
 
class HttpConnection;
class HttpHandler;
 
class HttpServer : public std::enable_shared_from_this<HttpServer> {
 public:
  HttpServer(boost::asio::io_context& io, boost::asio::ip::tcp::endpoint ep, const addr_t& node_addr,
             const std::shared_ptr<HttpProcessor>& request_processor, std::shared_ptr<metrics::JsonRpcMetrics> metrics);
 
  virtual ~HttpServer() { HttpServer::stop(); }
 
  bool start();
  bool stop();
 
  void accept();
  boost::asio::io_context& getIoContext() { return io_context_; }
  std::shared_ptr<HttpServer> getShared();
  std::shared_ptr<HttpConnection> createConnection();
  friend HttpConnection;
  friend HttpHandler;
 
 protected:
  std::shared_ptr<HttpProcessor> request_processor_;
  std::shared_ptr<metrics::JsonRpcMetrics> metrics_;
 
 private:
  std::atomic<bool> stopped_ = true;
  boost::asio::io_context& io_context_;
  boost::asio::ip::tcp::acceptor acceptor_;
  boost::asio::ip::tcp::endpoint ep_;
  LOG_OBJECTS_DEFINE
};
// QQ:
// Why RpcConnection and Rpc use different io_context?
// Rpc use a io_context to create acceptor
// RpcConnection use the io_context from node to create socket
 
// node and rpc use same io_context
 
// QQ:
// atomic_flag responded, is RpcConnection multithreaded??
 
class HttpConnection : public std::enable_shared_from_this<HttpConnection> {
 public:
  explicit HttpConnection(const std::shared_ptr<HttpServer>& http_server);
  virtual ~HttpConnection() { HttpConnection::stop(); }
  boost::asio::ip::tcp::socket& getSocket() { return socket_; }
  virtual std::shared_ptr<HttpConnection> getShared();
  void read();
  void stop();
 
 protected:
  std::shared_ptr<HttpServer> server_;
  boost::asio::ip::tcp::socket socket_;
  boost::beast::flat_buffer buffer_;
  boost::beast::http::request<boost::beast::http::string_body> request_;
  boost::beast::http::response<boost::beast::http::string_body> response_;
};
 
}  // namespace taraxa::net