peerconnection_server 解析

WebRTC windows example下的peerconnection_server

 

SocketBase 为windows socket的封装类；

class SocketBase {
 public:
  SocketBase() : socket_(INVALID_SOCKET) {}
  explicit SocketBase(NativeSocket socket) : socket_(socket) {}
  ~SocketBase() { Close(); }

  NativeSocket socket() const { return socket_; }
  bool valid() const { return socket_ != INVALID_SOCKET; }

  bool Create();
  void Close();

 protected:
  NativeSocket socket_;
};

Create 方法会创建一个TCP socket

bool SocketBase::Create() {
  assert(!valid());
  socket_ = ::socket(AF_INET, SOCK_STREAM, 0);
  return valid();
}

　　

ListeningSocket是server socket，用于侦听端口和接收客户端请求；

class ListeningSocket : public SocketBase {
 public:
  ListeningSocket() {}

  bool Listen(unsigned short port);
  DataSocket* Accept() const;
};

Accept方法为每个新连接产生一个DataSocket实例；

DataSocket* ListeningSocket::Accept() const {
  assert(valid());
  struct sockaddr_in addr = {0};
  socklen_t size = sizeof(addr);
  NativeSocket client =
      accept(socket_, reinterpret_cast<sockaddr*>(&addr), &size);
  if (client == INVALID_SOCKET)
    return NULL;

  return new DataSocket(client);
}

　　

 

class DataSocket : public SocketBase {
 public:

  bool OnDataAvailable(bool* close_socket);

  // Send a raw buffer of bytes.
  bool Send(const std::string& data) const;
  

  // Send an HTTP response.
  bool Send(const std::string& status,
            bool connection_close,
            const std::string& content_type,
            const std::string& extra_headers,
            const std::string& data) const;
...
};