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      1 /*
      2  * libjingle
      3  * Copyright 2011, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_EXAMPLES_PEERCONNECTION_SERVER_PEER_CHANNEL_H_
     29 #define TALK_EXAMPLES_PEERCONNECTION_SERVER_PEER_CHANNEL_H_
     30 #pragma once
     31 
     32 #include <time.h>
     33 
     34 #include <queue>
     35 #include <string>
     36 #include <vector>
     37 
     38 class DataSocket;
     39 
     40 // Represents a single peer connected to the server.
     41 class ChannelMember {
     42  public:
     43   explicit ChannelMember(DataSocket* socket);
     44   ~ChannelMember();
     45 
     46   bool connected() const { return connected_; }
     47   int id() const { return id_; }
     48   void set_disconnected() { connected_ = false; }
     49   bool is_wait_request(DataSocket* ds) const;
     50   const std::string& name() const { return name_; }
     51 
     52   bool TimedOut();
     53 
     54   std::string GetPeerIdHeader() const;
     55 
     56   bool NotifyOfOtherMember(const ChannelMember& other);
     57 
     58   // Returns a string in the form "name,id\n".
     59   std::string GetEntry() const;
     60 
     61   void ForwardRequestToPeer(DataSocket* ds, ChannelMember* peer);
     62 
     63   void OnClosing(DataSocket* ds);
     64 
     65   void QueueResponse(const std::string& status, const std::string& content_type,
     66                      const std::string& extra_headers, const std::string& data);
     67 
     68   void SetWaitingSocket(DataSocket* ds);
     69 
     70  protected:
     71   struct QueuedResponse {
     72     std::string status, content_type, extra_headers, data;
     73   };
     74 
     75   DataSocket* waiting_socket_;
     76   int id_;
     77   bool connected_;
     78   time_t timestamp_;
     79   std::string name_;
     80   std::queue<QueuedResponse> queue_;
     81   static int s_member_id_;
     82 };
     83 
     84 // Manages all currently connected peers.
     85 class PeerChannel {
     86  public:
     87   typedef std::vector<ChannelMember*> Members;
     88 
     89   PeerChannel() {
     90   }
     91 
     92   ~PeerChannel() {
     93     DeleteAll();
     94   }
     95 
     96   const Members& members() const { return members_; }
     97 
     98   // Returns true if the request should be treated as a new ChannelMember
     99   // request.  Otherwise the request is not peerconnection related.
    100   static bool IsPeerConnection(const DataSocket* ds);
    101 
    102   // Finds a connected peer that's associated with the |ds| socket.
    103   ChannelMember* Lookup(DataSocket* ds) const;
    104 
    105   // Checks if the request has a "peer_id" parameter and if so, looks up the
    106   // peer for which the request is targeted at.
    107   ChannelMember* IsTargetedRequest(const DataSocket* ds) const;
    108 
    109   // Adds a new ChannelMember instance to the list of connected peers and
    110   // associates it with the socket.
    111   bool AddMember(DataSocket* ds);
    112 
    113   // Closes all connections and sends a "shutting down" message to all
    114   // connected peers.
    115   void CloseAll();
    116 
    117   // Called when a socket was determined to be closing by the peer (or if the
    118   // connection went dead).
    119   void OnClosing(DataSocket* ds);
    120 
    121   void CheckForTimeout();
    122 
    123  protected:
    124   void DeleteAll();
    125   void BroadcastChangedState(const ChannelMember& member,
    126                              Members* delivery_failures);
    127   void HandleDeliveryFailures(Members* failures);
    128 
    129   // Builds a simple list of "name,id\n" entries for each member.
    130   std::string BuildResponseForNewMember(const ChannelMember& member,
    131                                         std::string* content_type);
    132 
    133  protected:
    134   Members members_;
    135 };
    136 
    137 #endif  // TALK_EXAMPLES_PEERCONNECTION_SERVER_PEER_CHANNEL_H_
    138