coop-agent.cc

这是P2P流媒体方案－NICE的实现源码

	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;
	}
#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-rcr) : src stay as root (root-xfer to src)\n\n", id);
#endif 
	do_internal_root_transfer(l,other_root);

        log_cluster_change_info(l->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
	display_cluster_info(l,l->lid);
#endif 
	
	return;
      }
    }
    // else(s does not think it is the root): nothing to do
  }
  else { // I am not the root
    AgentInfo old_root(l->root->ag.agent_id,l->root->ag.agent_addr);

    if ( (l->root->ag.agent_id == ap->src_agent) /*&& 
         (l->root->ag.node_id == ap->src)*/ ) { // I think s is the root
      if (match_cluster_to_root_info(l) == true) {
	change = true;
	match_to_root_done = true;
      }
      if ( (l->lid + 1) < MAX_LAYERS) {
        if (layers.arr[l->lid+1] == NULL)
          layers.arr[l->lid+1] = new LayerInfo (l->lid+1, this);
	put_cluster_refresh_hl_info_into_layer_agent(ap, layers.arr[l->lid+1],id,udp_recv_agent_addr);
	if (m_ping_in_progress == true) {
	//  m_ping_resps_received = get_ping_response_count_in_layer(layers.arr[l->lid+1]);
	  test_for_all_pings_received = true;
        }
      }

      if ( ( (ap->u.clusterrefresh_p.is_root == true) && // s thinks it is root
	     (ap->u.clusterrefresh_p.root_xfer == true) ) ||
	   (ap->u.clusterrefresh_p.is_root == false) ) { // s doesnt think it is root
	void *pos = l->ag_list.Locate(ap->u.clusterrefresh_p.agent_arr[0].ag.agent_id);
	if (pos == NULL)
	  assert (pos != NULL);
	LayerAgentInfo *new_root = l->ag_list.GetAt(pos);

	assert ( (old_root.agent_id != new_root->ag.agent_id) /*|| (old_root.node_id != new_root->ag.node_id) */); // THE IF STMT (NEXT LINE) IS NOT NEEDED
	if ( (old_root.agent_id != new_root->ag.agent_id) /*|| (old_root.node_id != new_root->ag.node_id) */) {
#ifdef LOG_COOP_JUNK
          printf ("[coop %d ] . . (c-rcr) : have a new cluster-root < [ %d ] >\n", id, new_root->ag.agent_id);
#endif 
	  l->root = new_root;
	  change = true;

	  cancel_higher_layer_ping_timers();
	}
	// Join next higher layer, if it was a root transfer to me
	if (self_check(l->root) == true) {
#ifdef LOG_COOP_JUNK
          printf ("[coop %d ] . . (c-rcr) : me not root, root xfer to me\n", id);
#endif 
	  join_to_next_higher_layer(l->lid);
	  l->delay_root_xfer = true;
        }
	else {
	  // The higher layer ping timer is set only when the next higher
	  // layer info is known. If I am joining as the new leader, then
	  // this info is not known.
	  set_higher_layer_ping_timer();
	}
      }
    } // else I dont think s is the root: do nothing
  }

  if (match_to_root_done == false) { // Only in this case, is this check
  // required to see if we need to delete and free this member. In all
  // other cases, we have already done the delete and returned from the
  // function.
  // So if match_to_root not done, and control is here, then do this
  // check and delete if appropriate.
    if (ap->u.clusterrefresh_p.cluster_remove == true) { // Delete
      bool check = l->DeleteClusterMember(la_ag);

      assert (check == true); // This is true after the match_to_root stuff.

      if (check == true) {
#ifdef LOG_COOP_JUNK
        printf ("[coop %d ] . . (c-rcr) : src self-remove\n", id);
#endif 
        delete la_ag;
        change = true;
      }
    }
  }

  if ( (m_ping_in_progress == true) && (test_for_all_pings_received == true) ) {
    m_ping_resps_received = get_ping_response_count_in_layer(layers.arr[l->lid+1]);
    if ( (l->lid + 1) != m_ping_lid )
      assert ( (l->lid+1) == m_ping_lid);
    if (check_all_ping_responses_received() == true) {
      int lower_lid = m_ping_lid - 1;
      //printf ("[%d %d] At %8.4f ping before-process handle-cluster-refresh\n", id, n->id, /* Scheduler::my_clock() */ my_clock());
      if (process_ping_responses () == true) {

	//printf ("[ %d ] At %8.4f ping handle-cluster-refresh\n", id, /* Scheduler::my_clock() */ my_clock());
      	change = true;
        l = layers.arr[lower_lid];
      }
    }
  }

  if (change == true) {
    assert (l != NULL);
    log_cluster_change_info(l->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
    display_cluster_info(l,l->lid);
#endif 
  }

  return;
}

void coopAgent::handle_cluster_merge (AppPacket * ap) {

  if (valid_cluster_merge_packet(ap) == false)
    return;
#ifdef LOG_COOP_RECV
  printf ("[coop %d ] At %8.4f (c-merge) : recvd-valid-merge : lid %d from < [ %d ]>\n", id, /* Scheduler::my_clock() */ my_clock(),ap->u.clustermerge_p.layer_id,ap->src_agent);
  for (int i = 0; i < ap->u.clustermerge_p.mbr_count; i++)
    printf ("[coop %d ] . . (c-merge) < [ %d ] >\n", id, ap->u.clustermerge_p.agent_arr[i].ag.agent_id);
  printf ("\n");
#endif 

  LayerInfo *l = layers.arr[ap->u.clustermerge_p.layer_id];
  assert (l != NULL);
  int count = l->AddExtraMembersFromAltRootPacket(ap);
  if (count > 0) {
    log_cluster_change_info(l->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
    display_cluster_info(l,l->lid);
#endif 
  }
  l->cr_msgt.CancelTimer();
  send_all_cluster_refresh_packet(l,false,true,NULL);
  l->cr_msgt.SetTimer(CONST_CLUSTER_REFRESH_MSG_TIMEOUT);
  return;
}

void coopAgent::handle_ping_query (AppPacket *ap) {
  
  assert (ap->st == PING_QUERY);
  int this_lid = ap->u.pingq_p.lid;
  bool accept = false;
  double dist = -1.0;

#ifdef LOG_COOP_JUNK_PING
  printf ("[coop %d ] At %8.4f recv-pingq : lid %d : from < [ %d ] >\n", id, /* Scheduler::my_clock() */ my_clock(), ap->u.pingq_p.lid, ap->src_agent);
#endif 

  if (layers.arr[this_lid] != NULL) {
    if (layers.arr[this_lid]->me_in_layer == true) {

      /* This is new stuff: reject a ping request if accepting this
       * member increases my cluster radius */
      LayerInfo * lower_layer = layers.arr[this_lid - 1];
      assert (lower_layer != NULL);
      assert (lower_layer->root != NULL);
      assert (self_check(lower_layer->root) == true);
      LayerAgentInfo * my_farthest = find_farthest_agent_to_me_in_layer(lower_layer);
      assert (my_farthest != NULL);
      long my_farthest_dist_long = USECS(my_farthest->dist);
      {
	struct sockaddr_in their_addr; 
	memcpy(& their_addr, & ap->src_agent_addr, sizeof(struct sockaddr_in));
	their_addr.sin_port = htons(DIST_EST_PORT);
        dist = estimate_rtt_wrapper(their_addr);
      }

      long this_dist_long = USECS(dist);

      if (my_farthest_dist_long > this_dist_long)
        accept = true;
      else {
#ifdef LOG_COOP_JUNK_PING
  	printf ("[coop %d ] . . recv-pingq : reject (dist-violation)\n", id);
#endif 
      }
    }
  }
  AppPacket *resp_p = new AppPacket (PING_RESPONSE);
//sunny change3 (6lines)
	resp_p->src_agent=this->id;
    	memcpy(& resp_p->src_agent_addr, & this->udp_recv_agent_addr, sizeof(struct sockaddr_in));
/* no dst_agent
	resp_p->dst_agent=ap->src_ag.agent_id;
    	memcpy(& resp_p->dst_agent_addr, & ap->src_ag.agent_addr, sizeof(struct sockaddr_in));
*/
//sunny 
  resp_p->u.pingresp_p.accept = accept;
  resp_p->u.pingresp_p.lid = this_lid;
  resp_p->u.pingresp_p.src_time = ap->u.pingq_p.src_time;
  resp_p->u.pingresp_p.dist = dist;

  if (accept == true) {
    assert (this_lid > 0);
    LayerInfo * lower_layer = layers.arr[this_lid - 1];
    //assert (lower_layer != NULL);
    //assert (lower_layer->root != NULL);
    //assert (self_check(lower_layer->root) == true);

    void * pos = lower_layer->ag_list.Locate(ap->src_agent);
    if (pos != NULL) {
#ifdef LOG_COOP_JUNK
      printf ("[coop %d ] At %8.4f pinger < [ %d ] > dup\n", id, /* Scheduler::my_clock() */ my_clock(),ap->src_agent);
#endif 
      LayerAgentInfo * this_la = lower_layer->ag_list.GetAt(pos);
      lower_layer->ag_list.RemoveAt(pos);
      delete this_la;
      log_cluster_change_info(lower_layer->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
    display_cluster_info(lower_layer,lower_layer->lid);
#endif 
    }

    put_layer_cluster_info_into_packet(lower_layer,resp_p);
  }

#ifdef LOG_COOP_JUNK
    printf ("[coop %d ] At %8.4f ping-check-debug-send < [ %d ] > dist %f\n", id, /* Scheduler::my_clock() */ my_clock(),ap->src_agent, resp_p->u.pingresp_p.dist);
#endif

  send_pkt_wrapper(resp_p,ap->src_agent,ap->src_agent_addr);
  return;
}

void coopAgent::handle_ping_response (AppPacket * ap) {

  assert (ap->st == PING_RESPONSE);

  if ( (m_ping_in_progress == false) || (ap->u.pingresp_p.lid != m_ping_lid) )
    return;
  LayerInfo * l = layers.arr[m_ping_lid];
  assert (l != NULL);
  void * pos = l->ag_list.Locate(ap->src_agent);
  if (pos == NULL)
    return;
  LayerAgentInfo * la = l->ag_list.GetAt(pos);
  //  la->dist = (/* Scheduler::my_clock() */ my_clock() - ap->u.pingresp_p.src_time) / 2.0;
  //modify ping to just estimate rtt...
  if (ap->u.pingresp_p.dist >= 0.0) {
    la->dist = ap->u.pingresp_p.dist;
    la->dist_clock = my_clock();
    la->valid_dist_clock = true;
  }
  /*
  if ((la->valid_dist_clock == false) || (my_clock() - la->dist_clock >= DIST_CLOCK_THRESHOLD)) {
    //  dist = MAX_RTT;
    struct sockaddr_in their_addr; 
    memcpy(& their_addr, & la->ag.agent_addr, sizeof(struct sockaddr_in));
    their_addr.sin_port = htons(DIST_EST_PORT);
    la->dist = estimate_rtt_wrapper(their_addr);
    la->dist_clock = my_clock();
    la->valid_dist_clock = true;
  }
  */
  
  if (la->lower_layer != NULL) {
    delete la->lower_layer;
    la->lower_layer = NULL;
  }
#ifdef LOG_COOP_JUNK_PING
  printf ("[coop %d ] At %8.4f recv-pingresp : lid %d : from < [ %d ] > dist %f %s\n", id, /* Scheduler::my_clock() */ my_clock(), m_ping_lid, ap->src_agent, la->dist, (ap->u.pingresp_p.accept == true) ? "" : "*reject*" );
#endif 
  if (ap->u.pingresp_p.accept == true) {
    la->lower_layer = new LayerInfo(m_ping_lid-1,this);
    put_packet_cluster_info_into_layer(ap,la->lower_layer);
    m_ping_resps_received ++;
  }
  else {
    bool success = l->DeleteClusterMember(la);
    delete la;
    assert (success == true);
  }

  if (check_all_ping_responses_received() == true) {
    int lower_lid = m_ping_lid - 1;
    if (process_ping_responses () == true) {
      //printf ("[ %d ] At %8.4f ping recv-ping-resp\n", id, /* Scheduler::my_clock() */ my_clock());
      LayerInfo * new_layer = layers.arr[lower_lid];
      assert (new_layer != NULL);
      log_cluster_change_info(new_layer->lid);
#ifdef LOG_COOP_CLUSTER_CHANGE
      display_cluster_info(new_layer,new_layer->lid);
#endif 
    }
  }

  return;
}

bool coopAgent::check_all_ping_responses_received (void) {

  assert (m_ping_in_progress == true);

  LayerInfo *l = layers.arr[m_ping_lid];
  assert (l != NULL);
  // If this higher layer has BSE, then cannot count it, since BSE is not sent
  // a ping.
  int ignore_bse;
  if (l->ag_list.Locate(bse.agent_id) != NULL)
    ignore_bse = 1;
  else
    ignore_bse = 0;
  // The -1 is due to not including the root of the lower layer in this
  if ( m_ping_resps_received == ( l->ag_list.GetSize() - 1 - ignore_bse) )
    return true;
  return false;
}

/* Returns true if there is a change */
bool coopAgent::process_ping_responses (void) {

  bool ret_val = false;

  assert (m_ping_lid > 0);
  LayerInfo * hl = layers.arr[m_ping_lid];
  assert (hl != NULL);

  LayerInfo * my_highest_layer = layers.arr[m_ping_lid - 1];
  assert (my_highest_layer != NULL);
  assert (my_highest_layer->root != NULL);
  if (my_highest_layer->root->dist < 0.0)
    assert (my_highest_layer->root->dist >= 0.0);
  assert (my_highest_layer->me_in_layer == true);

  LayerAgentInfo * min_la = find_closest_agent_in_layer(hl,&(my_highest_layer->root->ag),true);

  if (min_la != NULL) {
    long my_highest_layer_root_dist_long = USECS(my_highest_layer->root->dist);
    long min_la_dist_long = USECS(min_la->dist);
    if (my_highest_layer_root_dist_long > min_la_dist_long) {

      ret_val = true;
#ifdef LOG_COOP_JUNK_PING_SWITCH
      printf ("[coop %d ] At %8.4f switch-root : lid %d : from < [ %d ] > to < [ %d ] > dist %8.4f \n", id, /* Scheduler::my_clock() */ my_clock(), m_ping_lid - 1, my_highest_layer->root->ag.agent_id, min_la->ag.agent_id, min_la->dist);
#endif 

      // Send the cluster remove in old cluster
      // Delete self
      void * pos = my_highest_layer->ag_list.Locate(id);
      assert (pos != NULL);
      LayerAgentInfo * self_ag = my_highest_layer->ag_list.GetAt(pos);
      my_highest_layer->ag_list.RemoveAt(pos);
      my_highest_layer->me_in_layer = false;
  
      if (my_highest_layer->ag_list.GetSize() > 0)
	send_cluster_remove(my_highest_layer,false);

      delete my_highest_layer;

      // Send the join to new cluster
      layers.arr[m_ping_lid-1] = min_la->lower_layer;
      min_la->lower_layer = NULL;

      LayerInfo * new_layer = layers.arr[m_ping_lid-1];
      bool check = new_layer->AddClusterMember(self_ag);
      assert (check == true);
      new_layer->me_in_layer = true;
    
      assert (new_layer->root != NULL);

      assert ( (new_layer->root->ag.agent_id == min_la->ag.agent_id) /* && (new_layer->root->ag.node_id == min_la->ag.node_id) */);
      assert (min_la->dist >= 0.0);
      new_layer->root->dist = min_la->dist;

      AppPacket *pkt = new AppPacket(JOIN_QUERY);
      init_join_query_packet(pkt,m_ping_lid-1,/* Scheduler::my_clock() */ my_clock(),true, udp_recv_agent_addr);
//sunny change3 (6lines)
	pkt->src_agent=this->id;
    	memcpy(& pkt->src_agent_addr, & this->udp_recv_agent_addr, sizeof(struct sockaddr_in));
	pkt->dst_agent=new_layer->root->ag.agent_id;
    	memcpy(& pkt->dst_agent_addr, & new_layer->root->ag.agent_addr, sizeof(struct sockaddr_in));
//sunny 
      send_pkt_wrapper(pkt,new_layer->root->ag.agent_id, new_layer->root->ag.agent_addr);
      new_layer->cr_msgt.SetTimer(CONST_CLUSTER_REFRESH_MSG_TIMEOUT);
      new_layer->cr_chkt.SetTimer(CONST_CLUSTER_REFRESH_CHECK_TIMEOUT);
      assert (state == ATTACHED);

    }
  }

  cancel_higher_layer_ping_timers();
  set_higher_layer_ping_timer();
  return ret_val;
}

void coopAgent::handle_data_ack_packet (AppPacket *ap) {

  assert (ap->st == PACKET_DATA_ACK);
//#ifdef LOG_DATA_PACKET_RECV
  printf ("[coop %d ] At %8.4f recv ack-pkt : < [ %d ] > seq %d : from < [ %d ] >\n", id, /* Scheduler::my_clock() */ my_clock(), ap->u.dataack_p.original_src.agent_id, ap->u.dataack_p.seq_no, ap->src_agent);
//#endif 
  return;
}

int coopAgent::handle_data_packet (AppPacket *ap) {

  assert (ap->st == PACKET_DATA);
//#ifdef LOG_DATA_PACKET_RECV
  printf ("[coop %d ] At %8.4f recv data-pkt : < [ %d ] > seq %d : from < [ %d ] >\n", id, my_clock(), ap->u.data_p.original_src.agent_id, ap->u.data_p.seq_no, ap->src_agent);
printf("sunny: handle_data_packet orig_time: %f\n", ap->u.data_p.orig_time);
//#endif 

/* Send an ack back */
  AppPacket *new_ack_p = new AppPacket(PACKET_DATA_ACK);
//sunny change3 (6lines)
	new_ack_p->src_agent=this->id;
    	memcpy(& new_ack_p->src_agent_addr, & this->udp_recv_agent_addr, sizeof(struct sockaddr_in));
	new_ack_p->dst_agent=ap->src_agent;
    	memcpy(& new_ack_p->dst_agent_addr, & ap->src_agent_addr, sizeof(struct sockaddr_in));
//sunny 
  new_ack_p->u.dataack_p.seq_no = ap->u.data_p.seq_no;
  new_ack_p->u.dataack_p.original_src.agent_id = ap->u.data_p.original_src.agent_id;
  memcpy((void*)&(new_ack_p->u.dataack_p.original_src.agent_addr), (void*)&(ap->u.data_p.original_src.agent_addr), sizeof(struct sockaddr_in));
  send_pkt_wrapper(new_ack_p, ap->src_agent, ap->src_agent_addr);