net/socket/stream_socket.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_SOCKET_STREAM_SOCKET_H_
   6 #define NET_SOCKET_STREAM_SOCKET_H_
   7
   8 #include "net/base/net_log.h"
   9 #include "net/socket/next_proto.h"
  10 #include "net/socket/socket.h"
  11
  12 namespace net {
  13
  14 class AddressList;
  15 class IPEndPoint;
  16 class SSLInfo;
  17
  18 class NET_EXPORT_PRIVATE StreamSocket : public Socket {
  19  public:
  20   virtual ~StreamSocket() {}
  21
  22   // Called to establish a connection.  Returns OK if the connection could be
  23   // established synchronously.  Otherwise, ERR_IO_PENDING is returned and the
  24   // given callback will run asynchronously when the connection is established
  25   // or when an error occurs.  The result is some other error code if the
  26   // connection could not be established.
  27   //
  28   // The socket's Read and Write methods may not be called until Connect
  29   // succeeds.
  30   //
  31   // It is valid to call Connect on an already connected socket, in which case
  32   // OK is simply returned.
  33   //
  34   // Connect may also be called again after a call to the Disconnect method.
  35   //
  36   virtual int Connect(const CompletionCallback& callback) = 0;
  37
  38   // Called to disconnect a socket.  Does nothing if the socket is already
  39   // disconnected.  After calling Disconnect it is possible to call Connect
  40   // again to establish a new connection.
  41   //
  42   // If IO (Connect, Read, or Write) is pending when the socket is
  43   // disconnected, the pending IO is cancelled, and the completion callback
  44   // will not be called.
  45   virtual void Disconnect() = 0;
  46
  47   // Called to test if the connection is still alive.  Returns false if a
  48   // connection wasn't established or the connection is dead.
  49   virtual bool IsConnected() const = 0;
  50
  51   // Called to test if the connection is still alive and idle.  Returns false
  52   // if a connection wasn't established, the connection is dead, or some data
  53   // have been received.
  54   virtual bool IsConnectedAndIdle() const = 0;
  55
  56   // Copies the peer address to |address| and returns a network error code.
  57   // ERR_SOCKET_NOT_CONNECTED will be returned if the socket is not connected.
  58   virtual int GetPeerAddress(IPEndPoint* address) const = 0;
  59
  60   // Copies the local address to |address| and returns a network error code.
  61   // ERR_SOCKET_NOT_CONNECTED will be returned if the socket is not bound.
  62   virtual int GetLocalAddress(IPEndPoint* address) const = 0;
  63
  64   // Gets the NetLog for this socket.
  65   virtual const BoundNetLog& NetLog() const = 0;
  66
  67   // Set the annotation to indicate this socket was created for speculative
  68   // reasons.  This call is generally forwarded to a basic TCPClientSocket*,
  69   // where a UseHistory can be updated.
  70   virtual void SetSubresourceSpeculation() = 0;
  71   virtual void SetOmniboxSpeculation() = 0;
  72
  73   // Returns true if the socket ever had any reads or writes.  StreamSockets
  74   // layered on top of transport sockets should return if their own Read() or
  75   // Write() methods had been called, not the underlying transport's.
  76   virtual bool WasEverUsed() const = 0;
  77
  78   // Returns true if the underlying transport socket is using TCP FastOpen.
  79   // TCP FastOpen is an experiment with sending data in the TCP SYN packet.
  80   virtual bool UsingTCPFastOpen() const = 0;
  81
  82   // Returns true if NPN was negotiated during the connection of this socket.
  83   virtual bool WasNpnNegotiated() const = 0;
  84
  85   // Returns the protocol negotiated via NPN for this socket, or
  86   // kProtoUnknown will be returned if NPN is not applicable.
  87   virtual NextProto GetNegotiatedProtocol() const = 0;
  88
  89   // Gets the SSL connection information of the socket.  Returns false if
  90   // SSL was not used by this socket.
  91   virtual bool GetSSLInfo(SSLInfo* ssl_info) = 0;
  92
  93  protected:
  94   // The following class is only used to gather statistics about the history of
  95   // a socket.  It is only instantiated and used in basic sockets, such as
  96   // TCPClientSocket* instances.  Other classes that are derived from
  97   // StreamSocket should forward any potential settings to their underlying
  98   // transport sockets.
  99   class UseHistory {
 100    public:
 101     UseHistory();
 102     ~UseHistory();
 103
 104     // Resets the state of UseHistory and emits histograms for the
 105     // current state.
 106     void Reset();
 107
 108     void set_was_ever_connected();
 109     void set_was_used_to_convey_data();
 110
 111     // The next two setters only have any impact if the socket has not yet been
 112     // used to transmit data.  If called later, we assume that the socket was
 113     // reused from the pool, and was NOT constructed to service a speculative
 114     // request.
 115     void set_subresource_speculation();
 116     void set_omnibox_speculation();
 117
 118     bool was_used_to_convey_data() const;
 119
 120    private:
 121     // Summarize the statistics for this socket.
 122     void EmitPreconnectionHistograms() const;
 123     // Indicate if this was ever connected.
 124     bool was_ever_connected_;
 125     // Indicate if this socket was ever used to transmit or receive data.
 126     bool was_used_to_convey_data_;
 127
 128     // Indicate if this socket was first created for speculative use, and
 129     // identify the motivation.
 130     bool omnibox_speculation_;
 131     bool subresource_speculation_;
 132     DISALLOW_COPY_AND_ASSIGN(UseHistory);
 133   };
 134 };
 135
 136 }  // namespace net
 137
 138 #endif  // NET_SOCKET_STREAM_SOCKET_H_