net/tools/flip_server/acceptor_thread.h

// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_TOOLS_FLIP_SERVER_ACCEPTOR_THREAD_H_
#define NET_TOOLS_FLIP_SERVER_ACCEPTOR_THREAD_H_

#include <list>
#include <string>
#include <vector>

#include "base/compiler_specific.h"
#include "base/threading/simple_thread.h"
#include "net/tools/epoll_server/epoll_server.h"
#include "net/tools/flip_server/sm_interface.h"
#include "openssl/ssl.h"

struct sockaddr_in;

namespace net {

class FlipAcceptor;
class MemoryCache;
class SMConnection;
struct SSLState;

// TODO(mbelshe):  Get rid of this class; we don't need a lock just to set
//    a bool cross threads - especially one which only is set once...
class Notification {
 public:
  explicit Notification(bool value) : value_(value) {}

  void Notify() {
    base::AutoLock al(lock_);
    value_ = true;
  }
  bool HasBeenNotified() {
    base::AutoLock al(lock_);
    return value_;
  }
  bool value_;
  base::Lock lock_;
};

class SMAcceptorThread : public base::SimpleThread,
                         public EpollCallbackInterface,
                         public SMConnectionPoolInterface {
 public:
  SMAcceptorThread(FlipAcceptor* acceptor, MemoryCache* memory_cache);
  ~SMAcceptorThread() override;

  // EpollCallbackInteface interface
  void OnRegistration(EpollServer* eps, int fd, int event_mask) override {}
  void OnModification(int fd, int event_mask) override {}
  void OnEvent(int fd, EpollEvent* event) override;
  void OnUnregistration(int fd, bool replaced) override {}
  void OnShutdown(EpollServer* eps, int fd) override {}

  // SMConnectionPool interface
  void SMConnectionDone(SMConnection* sc) override;

  // TODO(mbelshe): figure out if we can move these to private functions.
  SMConnection* NewConnection();
  SMConnection* FindOrMakeNewSMConnection();
  void InitWorker();
  void HandleConnection(int server_fd, struct sockaddr_in* remote_addr);
  void AcceptFromListenFD();

  // Notify the Accept thread that it is time to terminate.
  void Quit() { quitting_.Notify(); }

  // Iterates through a list of active connections expiring any that have been
  // idle longer than the configured timeout.
  void HandleConnectionIdleTimeout();

  void Run() override;

 private:
  EpollServer epoll_server_;
  FlipAcceptor* acceptor_;
  SSLState* ssl_state_;
  bool use_ssl_;
  int idle_socket_timeout_s_;

  std::vector<SMConnection*> unused_server_connections_;
  std::vector<SMConnection*> tmp_unused_server_connections_;
  std::vector<SMConnection*> allocated_server_connections_;
  std::list<SMConnection*> active_server_connections_;
  Notification quitting_;
  MemoryCache* memory_cache_;
};

}  // namespace net

#endif  // NET_TOOLS_FLIP_SERVER_ACCEPTOR_THREAD_H_