coop-agent.cc

这是P2P流媒体方案－NICE的实现源码

  delete tmp_layer;
  free(cluster1);
  free(cluster2);

  return;
}


/* This will split the cluster associated with lid. The new cluster
 * that contains this member will stay as is, the other cluster
 * will be spawned off.
 */
void coopAgent::split_cluster_assuming_2k (LayerInfo * l) {

  // Currently, I am implementing a naive scheme. The leader
  // chooses its nearest neighbor to stay with it in its cluster.
  // Other more intelligent schemes will be implemented later.

  assert (l->ag_list.GetSize() == UPPER_2K);
  LinkedList<LayerAgentInfo *, double> my_cluster_list;
  /* In my_cluster, the agents are sorted in decreasing order of distance */
  LinkedList<LayerAgentInfo *, double> other_cluster_list;

  /* First, split the agents into my cluster and other cluster */
  /* All agents that I know distances to, are my cluster to start with */
  LayerAgentInfo *self = NULL;
  for (void * pos = l->ag_list.GetHeadPosition();
       pos != NULL;
       l->ag_list.GetNext(pos) ) {

    LayerAgentInfo *la_ag = l->ag_list.GetAt(pos);
    if ( self_check(la_ag) == true) {
      self = la_ag;
      continue;
    }
    if (la_ag->dist >= 0.0) {
      /* -1.0 is for sorting it in decreasing order of distance */
      my_cluster_list.Add(la_ag,-1.0 * la_ag->dist);
    }
    else { /* Sorted by increasing distance order */
      other_cluster_list.Add(la_ag,la_ag->dist);
    }
  }

  /* Whichever set has the higher number of agents, need to transfer
   * some agents to the other set */
  void *pos2 = other_cluster_list.GetHeadPosition();
  while ( my_cluster_list.GetSize() < (LOWER_K - 1) ) {
    
    LayerAgentInfo *a = other_cluster_list.GetAt(pos2);
    my_cluster_list.Add(a,-1.0 * a->dist);
    void * old_pos2 = pos2;
    other_cluster_list.GetNext(pos2);
    other_cluster_list.RemoveAt(old_pos2);
  }
  
  void *pos3 = my_cluster_list.GetHeadPosition();
  while (other_cluster_list.GetSize() < LOWER_K) {
    
    LayerAgentInfo *a = my_cluster_list.GetAt(pos2);
    other_cluster_list.Add(a,a->dist);
    void * old_pos3 = pos3;
    my_cluster_list.GetNext(pos3);
    my_cluster_list.RemoveAt(old_pos3);
  }

  // Re-create my own cluster tree
  l->RemoveAgents();
  l->AddClusterRoot(self);
  l->me_in_layer = true;
  for (void *pos4 = my_cluster_list.GetHeadPosition();
       pos4 != NULL;
       my_cluster_list.GetNext(pos4) ) {

    l->AddClusterMember(my_cluster_list.GetAt(pos4));
  }
  // Create the other cluster
  // SimpleTree<LayerAgentInfo *> other_cluster_tree;
  // void * pos5 = other_cluster_list.GetHeadPosition();
  // assert (pos5 != NULL);
  // LayerAgentInfo * oc_root_la = other_cluster.GetAt(pos5);
  // void * oc_root_pos = other_cluster_tree.SetRoot(oc_root_la);
  // for (pos5 = other_cluster_list.GetNext(pos5);
  //      pos5 != NULL;
  //      other_cluster_list.GetNext(pos5) ) {

  //   other_cluster_tree.AddChild(other_cluster_list.GetAt(pos5),oc_root_pos);
  // }

  /* HAVE TO SEND MESSAGE TO THE OTHER CLUSTER MEMBERS */

  my_cluster_list.RemoveAll();
  other_cluster_list.RemoveAll();

  return;
}

void coopAgent::handle_join_response (AppPacket * ap) {

  /* Need to validate if this is a desired response packet */
  if (valid_join_response_packet(ap) == false)
    return;

  int this_lid = ap->u.joinresp_p.layer_id;

//#ifdef LOG_COOP_RECV
  printf ("\n[coop %d ] At %8.4f (c-jr) : join-resp : lid %d from < [ %d ] > exp-src < [ %d ] >\n", id, /* Scheduler::my_clock() */ my_clock(),this_lid,ap->src_agent, ap->u.joinresp_p.exp_src.agent_id);
//#endif 

  if ( (ap->src_agent == bse.agent_id)/* && (ap->src == bse.node_id)*/ ) {
 
    assert (ap->u.joinresp_p.accept == true);
    /*
    if (ap->u.joinresp_p.your_id != UNDEFINED_AGENT_ID) 
      id = ap->u.joinresp_p.your_id; // recv new id
    */
    // BSE-JF : Have to delete all other members in curr_join_q_lid etc.
    // or have to wait till all resps are recvd and decide whether to
    // accept BSE or the other members

    flush_layer(this_lid);
    if (this_lid+1 < MAX_LAYERS) {
      flush_layer(this_lid+1);
    }

    layers.arr[this_lid] = new LayerInfo(this_lid,this);
    LayerInfo * this_layer = layers.arr[this_lid];
    jqt.CancelTimer();

    /* This is the top layer returned by BSE */
    put_packet_cluster_info_into_layer(ap,this_layer);
    if (this_lid == target_join_q_lid) { // This is the desired layer
      void * pos = this_layer->ag_list.Locate(id);
      assert (pos != NULL);
      LayerAgentInfo * self = this_layer->ag_list.GetAt(pos);
      self->dist = 0.0;

      LayerAgentInfo * bse_la = this_layer->FindClusterMember(bse.agent_id);
      assert (bse_la != NULL);
      //      bse_la->dist = /* Scheduler::my_clock() */ my_clock() - ap->send_time;
      
      /* The following if then else statement are not in myrns*/
      if ((bse_la->valid_dist_clock == false) || (my_clock() - bse_la->dist_clock >= DIST_CLOCK_THRESHOLD)) {
    //  dist = MAX_RTT;
	struct sockaddr_in their_addr; 
	memcpy(& their_addr, & bse_la->ag.agent_addr, sizeof(struct sockaddr_in));
	their_addr.sin_port = htons(DIST_EST_PORT);
	bse_la->dist = estimate_rtt_wrapper(their_addr);
	bse_la->dist_clock = my_clock();
	bse_la->valid_dist_clock = true;
      }

      this_layer->me_in_layer = true;
      this_layer->cr_msgt.SetTimer(CONST_CLUSTER_REFRESH_MSG_TIMEOUT);
      this_layer->cr_chkt.SetTimer(CONST_CLUSTER_REFRESH_CHECK_TIMEOUT);

      state = ATTACHED;

      set_higher_layer_ping_timer();

//#ifdef LOG_COOP_JUNK
      printf ("[coop %d ] . . (c-jr) : attach-to-bse\n\n", id);
//#endif 
      log_cluster_change_info(this_layer->lid);
//#ifdef LOG_COOP_CLUSTER_CHANGE
      display_cluster_info(this_layer,this_layer->lid);
//#endif 
    }
    else {
      assert (this_lid > target_join_q_lid);

      void * pos = this_layer->ag_list.Locate(id);
      if (pos != NULL) { // I am considered to be in this cluster !
	assert ( self_check(this_layer->root) == false); // I am not root	
//#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-jr) : part of returned cluster! delete\n", id);
//#endif 
	delete_self_from_layer(this_layer);
      }
//#ifdef LOG_COOP_JUNK
      printf ("[coop %d ] . . (c-jr) : continue-join-query\n\n", id);
//#endif 
      continue_join_query(this_lid);
    }
  }
  else { /* This is a message from the higher layer cluster
	  * We need to just save the information till the timeout
	  */
    LayerInfo * higher_layer = layers.arr[this_lid + 1];
    assert (higher_layer != NULL);
    void * mem_pos = higher_layer->ag_list.Locate(ap->u.joinresp_p.exp_src.agent_id);
    assert (mem_pos != NULL);
    LayerAgentInfo *hl_member = higher_layer->ag_list.GetAt(mem_pos);

    if (ap->u.joinresp_p.accept == false) {
//#ifdef LOG_COOP_JUNK
      printf ("[coop %d ] . . (c-jr) : join-reject\n\n", id);
//#endif 
      higher_layer->DeleteClusterMember(hl_member);
      delete hl_member;
    }
    else {
      /* If the response is coming from a different agent (I thought some
       * one else was the cluster leader, then we need to update that here */
      if ( (ap->u.joinresp_p.exp_src.agent_id != ap->src_agent) /*|| (ap->u.joinresp_p.exp_src.node_id != ap->src) */) {
	hl_member->ag.agent_id = ap->src_agent;
	//	hl_member->ag.node_id = ap->src;
	memcpy(& hl_member->ag.agent_addr, & ap->src_agent_addr, sizeof(struct sockaddr_in));
      }

      assert (ap->u.joinresp_p.mbr_count > 0);
      assert ( (hl_member->ag.agent_id == ap->u.joinresp_p.agent_arr[0].ag.agent_id) /* && (hl_member->ag.node_id == ap->u.joinresp_p.agent_arr[0].ag.node_id) */);

      if (hl_member->lower_layer != NULL)
	delete hl_member->lower_layer;
      else
	m_join_resp_received ++;
      
      hl_member->lower_layer = new LayerInfo (this_lid,this);
      put_packet_cluster_info_into_layer (ap,hl_member->lower_layer);

      LayerAgentInfo * self = hl_member->lower_layer->FindClusterMember(id);
      if (self != NULL)
	self->dist = 0.0;

      /* Using the time metric. Can use any other */
      //      hl_member->dist = /* Scheduler::my_clock() */ my_clock() - ap->send_time;
      if ((hl_member->valid_dist_clock == false) || (my_clock() - hl_member->dist_clock >= DIST_CLOCK_THRESHOLD)) {
    //  dist = MAX_RTT;
	struct sockaddr_in their_addr; 
	memcpy(& their_addr, & hl_member->ag.agent_addr, sizeof(struct sockaddr_in));
	their_addr.sin_port = htons(DIST_EST_PORT);
	hl_member->dist = estimate_rtt_wrapper(their_addr);
	hl_member->dist_clock = my_clock();
	hl_member->valid_dist_clock = true;
      }

//#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-jr) : dist-estimate %f\n", id, hl_member->dist);
//#endif 
    }

    int match_count = higher_layer->ag_list.GetSize();
    if (higher_layer->ag_list.Locate(bse.agent_id) != NULL)
      match_count --;
    if (match_count == m_join_resp_received) {
      
      jqt.CancelTimer();
//#ifdef LOG_COOP_JUNK
      printf ("[coop %d ] . . (c-jr) : all join resps found\n\n", id);
//#endif 
      process_received_join_responses();
    }
  }
  return;
}

void coopAgent::handle_cluster_refresh (AppPacket *ap) {

  assert (ap->st == CLUSTER_REFRESH);
  if (valid_cluster_refresh_packet(ap) == false)
    return;
  LayerInfo * l = layers.arr[ap->u.clusterrefresh_p.layer_id];
  void * this_agent_pos = l->ag_list.Locate(ap->src_agent); 
  assert (this_agent_pos != NULL);
  LayerAgentInfo *la_ag = l->ag_list.GetAt(this_agent_pos);;

  bool test_for_all_pings_received = false;

  bool change = false;
  bool match_to_root_done = false;

#ifdef TESTING_JUNK
  void * pos = l->ag_list.Locate(id);
  if (pos != NULL) {
    LayerAgentInfo * self = l->ag_list.GetAt(pos);
    assert (self->dist >= 0.0);
  }
#endif 

#ifdef LOG_COOP_RECV
  printf ("\n[coop %d ] At %8.4f (c-rcr) : recvd-valid-refresh : lid %d from < [ %d ] > %s %s %s\n", id, /* Scheduler::my_clock() */ my_clock(), l->lid,ap->src_agent, (ap->u.clusterrefresh_p.is_root == true) ? "root" : ".", (ap->u.clusterrefresh_p.root_xfer == true) ? "xfer" : ".", (ap->u.clusterrefresh_p.cluster_remove == true) ? "remove" : ".");
#endif 

#ifdef LOG_COOP_RECV_2
  printf ("[coop %d ] . . (c-rcr) : dist-info in refresh :", id);
  for (int i = 0; i < ap->u.clusterrefresh_p.mbr_count; i++)
    printf ("( %d %5.3f )", ap->u.clusterrefresh_p.agent_arr[i].ag.agent_id,ap->u.clusterrefresh_p.agent_arr[i].dist);
  printf ("\n");
#endif 

  /* Now this is a valid packet */
  la_ag->refresh_agent(ap);

  assert (l->root != NULL);
  if (self_check(l->root) == true) { // I am the root
    if (ap->u.clusterrefresh_p.is_root == true) {

    // Pkt src,s, thinks that it is the root

      // First check if it is doing a root transfer to me
      if ( (ap->u.clusterrefresh_p.root_xfer == true) &&
	   ( (ap->u.clusterrefresh_p.agent_arr[0].ag.agent_id == id) /* && 
									(ap->u.clusterrefresh_p.agent_arr[0].ag.node_id == n->id) */) ) {
        // In which case gladly add all unknown members
        bool members_added = false;
	if (l->AddExtraMembersFromAltRootPacket (ap) > 0) {
	  change = true;
          members_added = true;
        }
	// Do cluster remove
	if (ap->u.clusterrefresh_p.cluster_remove == true) { // Delete
#ifdef LOG_COOP_JUNK
          printf ("[coop %d ] . . (c-rcr) : src self-remove\n", id);
#endif 
	  bool check = l->DeleteClusterMember(la_ag);
	  assert (check == true);
	  delete la_ag;
	  change = true;
	}
#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-rcr) : src and me roots, root xfer to me\n\n", id);
#endif 
	if (change == true) {
          log_cluster_change_info(l->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
	  display_cluster_info(l,l->lid);
#endif 
        }

	// Immediate update of new member additions
        if (members_added == true) {
          l->cr_msgt.CancelTimer();
          send_all_cluster_refresh_packet(l,false,true,NULL);
          l->cr_msgt.SetTimer(CONST_CLUSTER_REFRESH_MSG_TIMEOUT);
	}
	return;
      }

      bool stay_as_root = false;

      // s_max: source dist to its farthest member
      // KCR-CHANGE (2 new lines)
      //double s_max = get_farthest_dist_of_member_to_agent(l,la_ag,false,false);
      double s_max = get_avg_dist_of_member_to_agent(l,la_ag,false,false);
      LayerAgentInfo * my_farthest_ag = find_farthest_agent_to_me_in_layer(l);
      double my_max = my_farthest_ag->dist;
      my_max = find_avg_agent_dist_to_me_in_layer(l);

      long s_max_long = USECS(s_max);
      long my_max_long = USECS(my_max);

      int s_know_count = count_dist_known_members_for_agent(la_ag,false);
      int me_know_count = count_dist_known_members_for_me(l);
      if (are_agent_members_contained_in_mine(l,la_ag) == true) {
	// All members in la_ag are also known to me
	if ( (s_know_count < me_know_count) || // I am the superset
	     (my_max_long < s_max_long) || // We are equal in size, but I am better
	     ( (my_max_long == s_max_long) && (id < la_ag->ag.agent_id) ) ) { // -do-
	  stay_as_root = true;
	} // else {stay_as_root = false;}
      }
      else if (are_my_members_contained_in_agent(l,la_ag) == false) { 
	// no one is a superset of the other
	if (id < la_ag->ag.agent_id) {
	  stay_as_root = true;
	} // else {stay_as_root = false;}

      } // else my_members_contained_in_agent() == true: 
        // i.e. s is a superset, so stay_as_root = false

      LayerAgentInfo * other_root;
      bool member_added = false;
      if (ap->u.clusterrefresh_p.root_xfer == true) {
	other_root = l->FindClusterMember(ap->u.clusterrefresh_p.agent_arr[0].ag.agent_id);
	if (other_root == NULL) {
	  LayerAgentInfo *new_guy = new LayerAgentInfo(ap->u.clusterrefresh_p.agent_arr[0].ag.agent_id,ap->u.clusterrefresh_p.agent_arr[0].ag.agent_addr);
	  l->AddClusterMember(new_guy);
	  other_root = new_guy;
	  change = true;
	  member_added = true;
	}
#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-rcr) : src and me roots, src root xfer to < [ %d ] >\n", id, other_root->ag.agent_id);
#endif 
      }
      else {
	assert (ap->u.clusterrefresh_p.cluster_remove == false);
	other_root = la_ag;
      }

      if (stay_as_root == true) {
	// Add all the extra members and send root challenge
	if (l->AddExtraMembersFromAltRootPacket(ap) > 0) {
	  change = true;
          member_added = true;
        }
	if (ap->u.clusterrefresh_p.cluster_remove == true) { // Delete
#ifdef LOG_COOP_JUNK
          printf ("[coop %d ] . . (c-rcr) : src self-remove\n", id);
#endif 
	  bool check = l->DeleteClusterMember(la_ag);
	  assert (check == true);
	  delete la_ag;
	  change = true;
	}
#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-rcr) : me stay as root (root-challenge)\n\n", id);
#endif 
	send_root_challenge(l,other_root);
	if (change == true) {
          log_cluster_change_info(l->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
	  display_cluster_info(l,l->lid);
#endif 
        }

	// Immediate inform other members of new member
	if (member_added == true) {
          l->cr_msgt.CancelTimer();
	  // Do not send this to the other root
          send_all_cluster_refresh_packet(l,false,true,other_root);
          l->cr_msgt.SetTimer(CONST_CLUSTER_REFRESH_MSG_TIMEOUT);
        }

	return;
      }
      else {
	change = true;