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source: source/ariba/overlay/BaseOverlay.cpp@ 5482

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1// [License]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
6// Institute of Telematics
7// UniversitÀt Karlsruhe (TH)
8// Zirkel 2, 76128 Karlsruhe
9// Germany
10//
11// Redistribution and use in source and binary forms, with or without
12// modification, are permitted provided that the following conditions are
13// met:
14//
15// 1. Redistributions of source code must retain the above copyright
16// notice, this list of conditions and the following disclaimer.
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
22// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33// The views and conclusions contained in the software and documentation
34// are those of the authors and should not be interpreted as representing
35// official policies, either expressed or implied, of the Institute of
36// Telematics.
37// [License]
38
39#include "BaseOverlay.h"
40
41#include <sstream>
42#include <iostream>
43#include <string>
44#include <boost/foreach.hpp>
45
46#include "ariba/NodeListener.h"
47#include "ariba/CommunicationListener.h"
48#include "ariba/SideportListener.h"
49
50#include "ariba/overlay/LinkDescriptor.h"
51#include "ariba/overlay/messages/OverlayMsg.h"
52#include "ariba/overlay/messages/JoinRequest.h"
53#include "ariba/overlay/messages/JoinReply.h"
54#include "ariba/overlay/messages/LinkRequest.h"
55#include "ariba/overlay/messages/RelayMessage.h"
56
57#include "ariba/utility/misc/OvlVis.h"
58
59namespace ariba {
60namespace overlay {
61
62LinkDescriptor* BaseOverlay::getDescriptor( const LinkID& link, bool communication ) {
63 BOOST_FOREACH( LinkDescriptor* lp, links )
64 if ((communication ? lp->communicationId : lp->overlayId) == link)
65 return lp;
66 return NULL;
67}
68
69const LinkDescriptor* BaseOverlay::getDescriptor( const LinkID& link, bool communication ) const {
70 BOOST_FOREACH( const LinkDescriptor* lp, links )
71 if ((communication ? lp->communicationId : lp->overlayId) == link)
72 return lp;
73 return NULL;
74}
75
76LinkDescriptor* BaseOverlay::getAutoDescriptor( const NodeID& node, const ServiceID& service ) {
77 BOOST_FOREACH( LinkDescriptor* lp, links )
78 if (lp->autolink && lp->remoteNode == node && lp->service == service)
79 return lp;
80 return NULL;
81}
82
83void BaseOverlay::eraseDescriptor( const LinkID& link, bool communication ) {
84 for ( vector<LinkDescriptor*>::iterator i = links.begin(); i!= links.end(); i++) {
85 LinkDescriptor* ld = *i;
86 if ((communication ? ld->communicationId : ld->overlayId) == link) {
87 delete ld;
88 links.erase(i);
89 break;
90 }
91 }
92}
93
94LinkDescriptor* BaseOverlay::addDescriptor( const LinkID& link ) {
95 LinkDescriptor* desc = getDescriptor( link );
96 if ( desc == NULL ) {
97 desc = new LinkDescriptor();
98 desc->overlayId = link;
99 links.push_back(desc);
100 }
101 return desc;
102}
103
104/// returns a direct link relay descriptor to the given relay node
105LinkDescriptor* BaseOverlay::getRelayDescriptor( const NodeID& relayNode ) {
106 BOOST_FOREACH( LinkDescriptor* lp, links )
107 if (lp->remoteNode == relayNode &&
108 lp->service == OverlayInterface::OVERLAY_SERVICE_ID &&
109 lp->relay == false &&
110 lp->up)
111 return lp;
112 return NULL;
113}
114
115/// find a proper relay node
116const NodeID BaseOverlay::findRelayNode( const NodeID id ) {
117 LinkDescriptor* rld = NULL;
118 NodeID relayNode = NodeID::UNSPECIFIED;
119
120 // get used next hop towards node
121 LinkID rlid = overlayInterface->getNextLinkId(id);
122 while ( relayNode.isUnspecified() && !rlid.isUnspecified() && rld == NULL ) {
123
124 // get descriptor of first hop
125 rld = getDescriptor(rlid);
126 logging_force( rld );
127
128 // is first hop a relay path? yes-> try to find real link!
129 if ( rld->relay )
130 relayNode = getRelayDescriptor(rld->localRelay)->remoteNode;
131
132 // no-> a proper relay node has been found
133 else relayNode = rld->remoteNode;
134 }
135
136 // if first relay is unknown choose a arbitrary direct node as relay
137 if ( relayNode.isUnspecified() ) {
138 for (size_t i=0; i<links.size(); i++)
139 if (links[i]->up &&
140 links[i]->communicationUp &&
141 !links[i]->relay &&
142 links[i]->keepAliveMissed <= 1 &&
143 links[i]->service == OverlayInterface::OVERLAY_SERVICE_ID) {
144 relayNode = links[i]->remoteNode;
145 break;
146 }
147 }
148
149 // do not return myself or use the node as relay node
150 if (relayNode == nodeId)
151 return NodeID::UNSPECIFIED;
152 else {
153 logging_force( "Returning relay node " << relayNode.toString() );
154 return relayNode;
155 }
156}
157
158/// forwards a message over relays/directly using link descriptor
159seqnum_t BaseOverlay::sendMessage( Message* message, const LinkDescriptor* ld ) {
160
161 // directly send message
162 if ( !ld->communicationId.isUnspecified() && ld->communicationUp ) {
163 logging_debug("Send: Sending message via Base Communication");
164 return bc->sendMessage( ld->communicationId, message );
165 }
166
167 // relay message
168 else if ( ld->relay ) {
169
170 logging_debug("Send: Relaying message to node "
171 << ld->remoteNode.toString()
172 << " using relay " << ld->localRelay
173 );
174
175 // get local relay link descriptor and mark as used for relaying
176 LinkDescriptor* rld = getRelayDescriptor(ld->localRelay);
177 if (rld==NULL) {
178 logging_error("Send: Relay descriptor for relay " <<
179 ld->localRelay.toString() << " is unknown.");
180 return -1;
181 }
182 rld->markAsRelay();
183
184 // create a information relay message to inform the relay about
185 OverlayMsg overlay_msg( OverlayMsg::typeRelay, ld->service, nodeId );
186 RelayMessage relayMsg( RelayMessage::typeInform, ld->remoteRelay, ld->remoteNode, ld->remoteLinkId );
187 relayMsg.encapsulate( message );
188 overlay_msg.encapsulate( &relayMsg );
189
190 // route message to relay node in order to inform it!
191 logging_debug("sendMessage: Sending message over relayed link with" << ld );
192 overlayInterface->routeMessage(rld->remoteNode, rld->overlayId, &overlay_msg);
193 return 0;
194 }
195
196 // error
197 else {
198 logging_error( "Could not send message descriptor=" << ld );
199 return -1;
200 }
201 return -1;
202}
203
204/// routes a message over the overlay or directly sends it when a link is open
205seqnum_t BaseOverlay::sendOverlay( Message* message, const NodeID& nodeid ) {
206 for (size_t i=0; i<links.size(); i++)
207 if ( links[i]->up &&
208 links[i]->communicationUp &&
209 !links[i]->relay &&
210 links[i]->keepAliveMissed <= 1 &&
211 links[i]->remoteNode == nodeid &&
212 links[i]->service == OverlayInterface::OVERLAY_SERVICE_ID) {
213 return sendMessage( message, links[i] );
214 break;
215 }
216 overlayInterface->routeMessage(nodeid, message);
217 return 0;
218}
219
220/// creates a link descriptor, apply relay semantics if possible
221LinkDescriptor* BaseOverlay::createLinkDescriptor(
222 const NodeID remoteNode, const ServiceID service, const LinkID link_id ) {
223
224 // find listener
225 if( !communicationListeners.contains( service ) ) {
226 logging_error( "No listener found for service " << service.toString() );
227 return NULL;
228 }
229 CommunicationListener* listener = communicationListeners.get( service );
230 assert( listener != NULL );
231
232 // copy link id
233 LinkID linkid = link_id;
234
235 // create link id if necessary
236 if ( linkid.isUnspecified() )
237 linkid = LinkID::create();
238
239 // create relay link descriptor
240 NodeID relayNode = findRelayNode(remoteNode);
241
242 // add descriptor
243 LinkDescriptor* ld = addDescriptor( linkid );
244 ld->overlayId = linkid;
245 ld->service = service;
246 ld->listener = listener;
247 ld->remoteNode = remoteNode;
248
249 // set relay node if available
250 ld->relay = !relayNode.isUnspecified();
251 ld->localRelay = relayNode;
252
253 if (!ld->relay)
254 logging_error("No relay found!");
255
256 // debug output
257 logging_debug( "Created link descriptor: " << ld );
258
259 return ld;
260}
261
262
263// ----------------------------------------------------------------------------
264
265use_logging_cpp(BaseOverlay);
266
267// ----------------------------------------------------------------------------
268
269BaseOverlay::BaseOverlay() :
270 bc(NULL), overlayInterface(NULL), nodeId(NodeID::UNSPECIFIED),
271 spovnetId(SpoVNetID::UNSPECIFIED), state(BaseOverlayStateInvalid),
272 sideport(&SideportListener::DEFAULT), started(false), counter(0) {
273}
274
275BaseOverlay::~BaseOverlay() {
276}
277
278// ----------------------------------------------------------------------------
279
280void BaseOverlay::start( BaseCommunication& _basecomm, const NodeID& _nodeid ) {
281 logging_info("Starting...");
282
283 // set parameters
284 bc = &_basecomm;
285 nodeId = _nodeid;
286
287 // register at base communication
288 bc->registerMessageReceiver( this );
289 bc->registerEventListener( this );
290
291 // timer for auto link management
292 Timer::setInterval( 500 );
293 Timer::start();
294
295 started = true;
296 state = BaseOverlayStateInvalid;
297}
298
299void BaseOverlay::stop() {
300 logging_info("Stopping...");
301
302 // stop timer
303 Timer::stop();
304
305 // delete oberlay interface
306 if(overlayInterface != NULL) {
307 delete overlayInterface;
308 overlayInterface = NULL;
309 }
310
311 // unregister at base communication
312 bc->unregisterMessageReceiver( this );
313 bc->unregisterEventListener( this );
314
315 started = false;
316 state = BaseOverlayStateInvalid;
317}
318
319bool BaseOverlay::isStarted(){
320 return started;
321}
322
323// ----------------------------------------------------------------------------
324
325void BaseOverlay::joinSpoVNet(const SpoVNetID& id,
326 const EndpointDescriptor& bootstrapEp) {
327
328 if(id != spovnetId){
329 logging_error("attempt to join against invalid spovnet, call initiate first");
330 return;
331 }
332
333
334 //ovl.visShowNodeBubble ( ovlId, nodeId, "joining..." );
335 logging_info( "Starting to join spovnet " << id.toString() <<
336 " with nodeid " << nodeId.toString());
337
338 if(bootstrapEp.isUnspecified() && state == BaseOverlayStateInvalid){
339
340 // bootstrap against ourselfs
341 logging_debug("joining spovnet locally");
342
343 overlayInterface->joinOverlay();
344 state = BaseOverlayStateCompleted;
345 BOOST_FOREACH( NodeListener* i, nodeListeners )
346 i->onJoinCompleted( spovnetId );
347
348 //ovl.visChangeNodeIcon ( ovlId, nodeId, OvlVis::ICON_ID_CAMERA );
349 //ovl.visChangeNodeColor( ovlId, nodeId, OvlVis::NODE_COLORS_GREEN );
350
351 logging_debug("starting overlay bootstrap module");
352 overlayBootstrap.start(this, spovnetId, nodeId);
353 overlayBootstrap.publish(bc->getEndpointDescriptor());
354
355 } else {
356
357 // bootstrap against another node
358 logging_debug("joining spovnet remotely against " << bootstrapEp.toString());
359
360 const LinkID& lnk = bc->establishLink( bootstrapEp );
361 bootstrapLinks.push_back(lnk);
362 logging_info("join process initiated for " << id.toString() << "...");
363 }
364}
365
366void BaseOverlay::leaveSpoVNet() {
367
368 logging_info( "Leaving spovnet " << spovnetId );
369 bool ret = ( state != this->BaseOverlayStateInvalid );
370
371 logging_debug("stopping overlay bootstrap module");
372 overlayBootstrap.stop();
373 overlayBootstrap.revoke();
374
375 logging_debug( "Dropping all auto-links" );
376
377 // gather all service links
378 vector<LinkID> servicelinks;
379 BOOST_FOREACH( LinkDescriptor* ld, links ) {
380 if( ld->service != OverlayInterface::OVERLAY_SERVICE_ID )
381 servicelinks.push_back( ld->overlayId );
382 }
383
384 // drop all service links
385 BOOST_FOREACH( LinkID lnk, servicelinks )
386 dropLink( lnk );
387
388 // let the node leave the spovnet overlay interface
389 logging_debug( "Leaving overlay" );
390 if( overlayInterface != NULL )
391 overlayInterface->leaveOverlay();
392
393 // drop still open bootstrap links
394 BOOST_FOREACH( LinkID lnk, bootstrapLinks )
395 bc->dropLink( lnk );
396
397 // change to inalid state
398 state = BaseOverlayStateInvalid;
399 //ovl.visShutdown( ovlId, nodeId, string("") );
400
401 // inform all registered services of the event
402 BOOST_FOREACH( NodeListener* i, nodeListeners ) {
403 if( ret ) i->onLeaveCompleted( spovnetId );
404 else i->onLeaveFailed( spovnetId );
405 }
406}
407
408void BaseOverlay::createSpoVNet(const SpoVNetID& id,
409 const OverlayParameterSet& param,
410 const SecurityParameterSet& sec,
411 const QoSParameterSet& qos) {
412
413 // set the state that we are an initiator, this way incoming messages are
414 // handled correctly
415 logging_info( "creating spovnet " + id.toString() <<
416 " with nodeid " << nodeId.toString() );
417
418 spovnetId = id;
419
420 overlayInterface = OverlayFactory::create( *this, param, nodeId, this );
421 if( overlayInterface == NULL ) {
422 logging_fatal( "overlay structure not supported" );
423 state = BaseOverlayStateInvalid;
424
425 BOOST_FOREACH( NodeListener* i, nodeListeners )
426 i->onJoinFailed( spovnetId );
427
428 return;
429 }
430}
431
432// ----------------------------------------------------------------------------
433
434const LinkID BaseOverlay::establishLink(
435 const EndpointDescriptor& ep, const NodeID& nodeid,
436 const ServiceID& service, const LinkID& linkid ) {
437
438 LinkID link_id = linkid;
439
440 // establish link via overlay
441 if (!nodeid.isUnspecified())
442 link_id = establishLink( nodeid, service, link_id );
443
444 // establish link directly if only ep is known
445 if (nodeid.isUnspecified())
446 establishLink( ep, service, link_id );
447
448 return link_id;
449}
450
451/// call base communication's establish link and add link mapping
452const LinkID BaseOverlay::establishLink( const EndpointDescriptor& ep,
453 const ServiceID& service, const LinkID& linkid ) {
454
455 // create a new link id if necessary
456 LinkID link_id = linkid;
457 if (link_id.isUnspecified()) link_id = LinkID::create();
458
459 /// find a service listener
460 if( !communicationListeners.contains( service ) ) {
461 logging_error( "No listener registered for service id=" << service.toString() );
462 return LinkID::UNSPECIFIED;
463 }
464 CommunicationListener* listener = communicationListeners.get( service );
465 assert( listener != NULL );
466
467 /// establish link and add mapping
468 logging_info("Establishing direct link " << link_id.toString()
469 << " using " << ep.toString());
470
471 // create descriptor
472 LinkDescriptor* ld = addDescriptor( link_id );
473 ld->overlayId = link_id;
474 ld->communicationId = link_id;
475 ld->listener = listener;
476 ld->service = service;
477 bc->establishLink( ep, link_id );
478
479 return link_id;
480}
481
482/// establishes a link between two arbitrary nodes
483const LinkID BaseOverlay::establishLink( const NodeID& node,
484 const ServiceID& service, const LinkID& link_id ) {
485
486 // do not establish a link to myself!
487 if (node == nodeId) return LinkID::UNSPECIFIED;
488
489 // create a link descriptor
490 LinkDescriptor* ld = createLinkDescriptor( node, service, link_id );
491
492 // create link request message with own link id
493 uint32_t nonce = (uint32_t)(rand() ^ (rand() << 16) ^ time(NULL));
494 LinkRequest link_request_msg(
495 nonce, &bc->getEndpointDescriptor(), false,
496 ld->overlayId, ld->localRelay );
497 OverlayMsg overlay_msg( OverlayMsg::typeLinkRequest, service, nodeId );
498 overlay_msg.encapsulate( &link_request_msg );
499 pendingLinks.insert( make_pair(nonce, ld->overlayId) );
500
501 // debug message
502 logging_debug(
503 "Sending link request with"
504 << " link id=" << ld->overlayId
505 << " node id=" << ld->remoteNode.toString()
506 << " service id=" << ld->service.toString()
507 << " local relay id=" << ld->localRelay.toString()
508 << " nonce= " << nonce
509 );
510
511 // sending message through new link
512 sendMessage( &overlay_msg, ld );
513
514 return ld->overlayId;
515}
516
517/// drops an established link
518void BaseOverlay::dropLink(const LinkID& link) {
519 logging_debug( "Dropping link (initiated locally):" << link.toString() );
520
521 // find the link item to drop
522 LinkDescriptor* ld = getDescriptor(link);
523 if( ld == NULL ) {
524 logging_warn( "Can't drop link, link is unknown!");
525 return;
526 }
527
528 // delete all queued messages
529 if( ld->messageQueue.size() > 0 ) {
530 logging_warn( "Dropping link " << ld->overlayId.toString() << " that has "
531 << ld->messageQueue.size() << " waiting messages" );
532 ld->flushQueue();
533 }
534
535 // inform sideport and listener
536 ld->listener->onLinkDown( ld->overlayId, ld->remoteNode );
537 sideport->onLinkDown(ld->overlayId, this->nodeId, ld->remoteNode, this->spovnetId );
538
539 // do not drop relay links
540 if (!ld->usedAsRelay) {
541 // drop the link in base communication
542 if (ld->communicationUp) bc->dropLink( ld->communicationId );
543
544 // erase descriptor
545 eraseDescriptor( ld->overlayId );
546 } else
547 ld->dropWhenRelaysLeft = true;
548}
549
550// ----------------------------------------------------------------------------
551
552/// internal send message, always use this functions to send messages over links
553seqnum_t BaseOverlay::sendMessage( const Message* message, const LinkID& link ) {
554 logging_debug( "Sending data message on link " << link.toString() );
555
556 // get the mapping for this link
557 LinkDescriptor* ld = getDescriptor(link);
558 if( ld == NULL ) {
559 logging_error("Could not send message. "
560 << "Link not found id=" << link.toString());
561 return -1;
562 }
563
564 // check if the link is up yet, if its an auto link queue message
565 if( !ld->up ) {
566 ld->markAsUsed();
567 if( ld->autolink ) {
568 logging_info("Auto-link " << link.toString() << " not up, queue message");
569 Data data = data_serialize( message );
570 const_cast<Message*>(message)->dropPayload();
571 ld->messageQueue.push_back( new Message(data) );
572 } else {
573 logging_error("Link " << link.toString() << " not up, drop message");
574 }
575 return -1;
576 }
577
578 // compile overlay message (has service and node id)
579 OverlayMsg overmsg( OverlayMsg::typeData, ld->service, nodeId );
580 overmsg.encapsulate( const_cast<Message*>(message) );
581
582 // send message over relay/direct/overlay
583 return sendMessage( &overmsg, ld );
584}
585
586seqnum_t BaseOverlay::sendMessage(const Message* message,
587 const NodeID& node, const ServiceID& service) {
588
589 // find link for node and service
590 LinkDescriptor* ld = getAutoDescriptor( node, service );
591
592 // if we found no link, create an auto link
593 if( ld == NULL ) {
594
595 // debug output
596 logging_info( "No link to send message to node "
597 << node.toString() << " found for service "
598 << service.toString() << ". Creating auto link ..."
599 );
600
601 // this will call onlinkup on us, if everything worked we now have a mapping
602 LinkID link = LinkID::create();
603
604 // call base overlay to create a link
605 link = establishLink( node, service, link );
606 ld = getDescriptor( link );
607 if( ld == NULL ) {
608 logging_error( "Failed to establish auto-link.");
609 return -1;
610 }
611 ld->autolink = true;
612
613 logging_debug( "Auto-link establishment in progress to node "
614 << node.toString() << " with link id=" << link.toString() );
615 }
616 assert(ld != NULL);
617
618 // mark the link as used, as we now send a message through it
619 ld->markAsUsed();
620
621 // send / queue message
622 return sendMessage( message, ld->overlayId );
623}
624
625// ----------------------------------------------------------------------------
626
627const EndpointDescriptor& BaseOverlay::getEndpointDescriptor(
628 const LinkID& link) const {
629
630 // return own end-point descriptor
631 if( link == LinkID::UNSPECIFIED )
632 return bc->getEndpointDescriptor();
633
634 // find link descriptor. not found -> return unspecified
635 const LinkDescriptor* ld = getDescriptor(link);
636 if (ld==NULL) return EndpointDescriptor::UNSPECIFIED;
637
638 // return endpoint-descriptor from base communication
639 return bc->getEndpointDescriptor( ld->communicationId );
640}
641
642const EndpointDescriptor& BaseOverlay::getEndpointDescriptor(
643 const NodeID& node) const {
644
645 // return own end-point descriptor
646 if( node == nodeId || node == NodeID::UNSPECIFIED )
647 return bc->getEndpointDescriptor();
648
649 // no joined and request remote descriptor? -> fail!
650 if( overlayInterface == NULL ) {
651 logging_error( "overlay interface not set, cannot resolve endpoint" );
652 return EndpointDescriptor::UNSPECIFIED;
653 }
654
655 // resolve end-point descriptor from the base-overlay routing table
656 return overlayInterface->resolveNode( node );
657}
658
659// ----------------------------------------------------------------------------
660
661bool BaseOverlay::registerSidePort(SideportListener* _sideport) {
662 sideport = _sideport;
663 _sideport->configure( this );
664}
665
666bool BaseOverlay::unregisterSidePort(SideportListener* _sideport) {
667 sideport = &SideportListener::DEFAULT;
668}
669
670// ----------------------------------------------------------------------------
671
672bool BaseOverlay::bind(CommunicationListener* listener, const ServiceID& sid) {
673 logging_debug( "binding communication listener " << listener
674 << " on serviceid " << sid.toString() );
675
676 if( communicationListeners.contains( sid ) ) {
677 logging_error( "some listener already registered for service id "
678 << sid.toString() );
679 return false;
680 }
681
682 communicationListeners.registerItem( listener, sid );
683 return true;
684}
685
686
687bool BaseOverlay::unbind(CommunicationListener* listener, const ServiceID& sid) {
688 logging_debug( "unbinding listener " << listener << " from serviceid " << sid.toString() );
689
690 if( !communicationListeners.contains( sid ) ) {
691 logging_warn( "cannot unbind listener. no listener registered on service id " << sid.toString() );
692 return false;
693 }
694
695 if( communicationListeners.get(sid) != listener ) {
696 logging_warn( "listener bound to service id " << sid.toString()
697 << " is different than listener trying to unbind" );
698 return false;
699 }
700
701 communicationListeners.unregisterItem( sid );
702 return true;
703}
704
705// ----------------------------------------------------------------------------
706
707bool BaseOverlay::bind(NodeListener* listener) {
708 logging_debug( "Binding node listener " << listener );
709
710 // already bound? yes-> warning
711 NodeListenerVector::iterator i =
712 find( nodeListeners.begin(), nodeListeners.end(), listener );
713 if( i != nodeListeners.end() ) {
714 logging_warn("Node listener " << listener << " is already bound!" );
715 return false;
716 }
717
718 // no-> add
719 nodeListeners.push_back( listener );
720 return true;
721}
722
723bool BaseOverlay::unbind(NodeListener* listener) {
724 logging_debug( "Unbinding node listener " << listener );
725
726 // already unbound? yes-> warning
727 NodeListenerVector::iterator i = find( nodeListeners.begin(), nodeListeners.end(), listener );
728 if( i == nodeListeners.end() ) {
729 logging_warn( "Node listener " << listener << " is not bound!" );
730 return false;
731 }
732
733 // no-> remove
734 nodeListeners.erase( i );
735 return true;
736}
737
738// ----------------------------------------------------------------------------
739
740void BaseOverlay::onLinkUp(const LinkID& id,
741 const address_v* local, const address_v* remote) {
742 logging_debug( "Link up with base communication link id=" << id );
743
744 // get descriptor for link
745 LinkDescriptor* ld = getDescriptor(id, true);
746
747 // handle bootstrap link we initiated
748 if( std::find(bootstrapLinks.begin(), bootstrapLinks.end(), id) != bootstrapLinks.end() ){
749 logging_info(
750 "Join has been initiated by me and the link is now up. " <<
751 "Sending out join request for SpoVNet " << spovnetId.toString()
752 );
753
754 // send join request message
755 OverlayMsg overlayMsg( OverlayMsg::typeJoinRequest, nodeId );
756 JoinRequest joinRequest( spovnetId, nodeId );
757 overlayMsg.encapsulate( &joinRequest );
758 bc->sendMessage( id, &overlayMsg );
759 return;
760 }
761
762 // no link found? -> link establishment from remote, add one!
763 if (ld == NULL) {
764 ld = addDescriptor( id );
765 logging_debug( "onLinkUp (remote request) descriptor: " << ld );
766
767 // update descriptor
768 ld->fromRemote = true;
769 ld->communicationId = id;
770 ld->communicationUp = true;
771 ld->markAsUsed();
772
773 // in this case, do not inform listener, since service it unknown
774 // -> wait for update message!
775
776 // link mapping found? -> send update message with node-id and service id
777 } else {
778 logging_debug( "onLinkUp descriptor (initiated locally):" << ld );
779
780 // note: necessary to validate the link on the remote side!
781 logging_debug( "Sending out update" <<
782 " for service " << ld->service.toString() <<
783 " with local node id " << nodeId.toString() <<
784 " on link " << ld->overlayId.toString() );
785
786 // update descriptor
787 ld->markAsUsed();
788 ld->communicationUp = true;
789
790 // if link is a relayed link ->convert to direct link
791 if (ld->relay) {
792 logging_force( "Converting to direct link: " << ld );
793 ld->up = true;
794 ld->relay = false;
795 ld->localRelay = NodeID::UNSPECIFIED;
796 OverlayMsg overMsg( OverlayMsg::typeDirectLink, ld->service, nodeId );
797 overMsg.setRelayLink( ld->remoteLinkId );
798 bc->sendMessage( ld->communicationId, &overMsg );
799 }
800
801 // compile and send update message
802 OverlayMsg overlayMsg( OverlayMsg::typeUpdate, ld->service, nodeId );
803 overlayMsg.setAutoLink( ld->autolink );
804 bc->sendMessage( ld->communicationId, &overlayMsg );
805 }
806}
807
808void BaseOverlay::onLinkDown(const LinkID& id,
809 const address_v* local, const address_v* remote) {
810
811 // erase bootstrap links
812 vector<LinkID>::iterator it = std::find( bootstrapLinks.begin(), bootstrapLinks.end(), id );
813 if( it != bootstrapLinks.end() ) bootstrapLinks.erase( it );
814
815 // get descriptor for link
816 LinkDescriptor* ld = getDescriptor(id, true);
817 if ( ld == NULL ) return; // not found? ->ignore!
818 logging_force( "onLinkDown descriptor: " << ld );
819
820 // inform listeners about link down
821 ld->communicationUp = false;
822 ld->listener->onLinkDown( ld->overlayId, ld->remoteNode );
823 sideport->onLinkDown( id, this->nodeId, ld->remoteNode, this->spovnetId );
824
825 // delete all queued messages (auto links)
826 if( ld->messageQueue.size() > 0 ) {
827 logging_warn( "Dropping link " << id.toString() << " that has "
828 << ld->messageQueue.size() << " waiting messages" );
829 ld->flushQueue();
830 }
831
832 // erase mapping
833 eraseDescriptor(ld->overlayId);
834}
835
836void BaseOverlay::onLinkChanged(const LinkID& id,
837 const address_v* oldlocal, const address_v* newlocal,
838 const address_v* oldremote, const address_v* newremote) {
839
840 // get descriptor for link
841 LinkDescriptor* ld = getDescriptor(id, true);
842 if ( ld == NULL ) return; // not found? ->ignore!
843 logging_debug( "onLinkChanged descriptor: " << ld );
844
845 // inform listeners
846 ld->listener->onLinkChanged( ld->overlayId, ld->remoteNode );
847 sideport->onLinkChanged( id, this->nodeId, ld->remoteNode, this->spovnetId );
848
849 // autolinks: refresh timestamp
850 ld->markAsUsed();
851}
852
853void BaseOverlay::onLinkFail(const LinkID& id,
854 const address_v* local, const address_v* remote) {
855 logging_debug( "Link fail with base communication link id=" << id );
856
857 // erase bootstrap links
858 vector<LinkID>::iterator it = std::find( bootstrapLinks.begin(), bootstrapLinks.end(), id );
859 if( it != bootstrapLinks.end() ) bootstrapLinks.erase( it );
860
861 // get descriptor for link
862 LinkDescriptor* ld = getDescriptor(id, true);
863 if ( ld == NULL ) return; // not found? ->ignore!
864 logging_debug( "Link failed id=" << ld->overlayId.toString() );
865
866 // inform listeners
867 ld->listener->onLinkFail( ld->overlayId, ld->remoteNode );
868 sideport->onLinkFail( id, this->nodeId, ld->remoteNode, this->spovnetId );
869
870 // autolinks: refresh timestamp
871 ld->markAsUsed();
872}
873
874void BaseOverlay::onLinkQoSChanged(const LinkID& id, const address_v* local,
875 const address_v* remote, const QoSParameterSet& qos) {
876 logging_debug( "Link quality changed with base communication link id=" << id );
877
878 // get descriptor for link
879 LinkDescriptor* ld = getDescriptor(id, true);
880 if ( ld == NULL ) return; // not found? ->ignore!
881 logging_debug( "Link quality changed id=" << ld->overlayId.toString() );
882
883 // autolinks: refresh timestamp
884 ld->markAsUsed();
885}
886
887bool BaseOverlay::onLinkRequest( const LinkID& id, const address_v* local,
888 const address_v* remote ) {
889 logging_debug("Accepting link request from " << remote->to_string() );
890 return true;
891}
892
893/// handles a message from base communication
894bool BaseOverlay::receiveMessage(const Message* message,
895 const LinkID& link, const NodeID& ) {
896 // get descriptor for link
897 LinkDescriptor* ld = getDescriptor( link, true );
898
899 // link known?
900 if (ld == NULL) { // no-> handle with unspecified params
901 logging_debug("Received message from base communication, link descriptor unknown" );
902 return handleMessage( message, LinkID::UNSPECIFIED, link, NodeID::UNSPECIFIED );
903 } else { // yes -> handle with overlay link id
904 logging_debug("Received message from base communication, link id=" << ld->overlayId.toString() );
905 return handleMessage( message, ld->overlayId, link, NodeID::UNSPECIFIED );
906 }
907}
908
909// ----------------------------------------------------------------------------
910
911/// handles a message from an overlay
912void BaseOverlay::incomingRouteMessage( Message* msg, const LinkID& link, const NodeID& source ) {
913 logging_debug("Received message from overlay -- "
914 << " link id=" << link.toString()
915 << " node id=" << source.toString() );
916 handleMessage( msg, link, LinkID::UNSPECIFIED, source );
917}
918
919// ----------------------------------------------------------------------------
920
921/// handles an incoming message
922bool BaseOverlay::handleMessage( const Message* message,
923 const LinkID& boLink, const LinkID& bcLink, const NodeID& remoteNode ) {
924 logging_debug( "Handling message: " << message->toString());
925
926 // decapsulate overlay message
927 OverlayMsg* overlayMsg =
928 const_cast<Message*>(message)->decapsulate<OverlayMsg>();
929 if( overlayMsg == NULL ) return false;
930
931 // mark the link as in action
932 LinkDescriptor* ld = getDescriptor(boLink);
933 if (ld == NULL) ld = getDescriptor(bcLink, true);
934 if (ld != NULL) {
935 ld->markAsUsed();
936 ld->markAlive();
937 }
938
939 switch ( overlayMsg->getType() ) {
940 // ---------------------------------------------------------------------
941 // Handle spovnet instance join requests
942 // ---------------------------------------------------------------------
943 case OverlayMsg::typeJoinRequest: {
944
945 // decapsulate message
946 JoinRequest* joinReq = overlayMsg->decapsulate<JoinRequest>();
947 logging_info( "Received join request for spovnet " <<
948 joinReq->getSpoVNetID().toString() );
949
950 // check spovnet id
951 if( joinReq->getSpoVNetID() != spovnetId ) {
952 logging_error(
953 "Received join request for spovnet we don't handle " <<
954 joinReq->getSpoVNetID().toString() );
955 return false;
956 }
957
958 // TODO: here you can implement mechanisms to deny joining of a node
959 bool allow = true;
960 logging_info( "Sending join reply for spovnet " <<
961 spovnetId.toString() << " to node " <<
962 overlayMsg->getSourceNode().toString() <<
963 ". Result: " << (allow ? "allowed" : "denied") );
964 joiningNodes.push_back( overlayMsg->getSourceNode() );
965
966 // return overlay parameters
967 assert( overlayInterface != NULL );
968 logging_debug( "Using bootstrap end-point "
969 << getEndpointDescriptor().toString() )
970 OverlayParameterSet parameters = overlayInterface->getParameters();
971 OverlayMsg retmsg( OverlayMsg::typeJoinReply, nodeId );
972 JoinReply replyMsg( spovnetId, parameters,
973 allow, getEndpointDescriptor() );
974 retmsg.encapsulate(&replyMsg);
975 bc->sendMessage( bcLink, &retmsg );
976 return true;
977 }
978
979 // ---------------------------------------------------------------------
980 // handle replies to spovnet instance join requests
981 // ---------------------------------------------------------------------
982 case OverlayMsg::typeJoinReply: {
983
984 // decapsulate message
985 logging_debug("received join reply message");
986 JoinReply* replyMsg = overlayMsg->decapsulate<JoinReply>();
987
988 // correct spovnet?
989 if( replyMsg->getSpoVNetID() != spovnetId ) { // no-> fail
990 logging_error( "Received SpoVNet join reply for " <<
991 replyMsg->getSpoVNetID().toString() <<
992 " != " << spovnetId.toString() );
993 return false;
994 }
995
996 // access granted? no -> fail
997 if( !replyMsg->getJoinAllowed() ) {
998 logging_error( "Our join request has been denied" );
999
1000 // drop initiator link
1001
1002 if(bcLink != LinkID::UNSPECIFIED){
1003 bc->dropLink( bcLink );
1004
1005 vector<LinkID>::iterator it = std::find(
1006 bootstrapLinks.begin(), bootstrapLinks.end(), bcLink);
1007 if( it != bootstrapLinks.end() )
1008 bootstrapLinks.erase(it);
1009 }
1010
1011 // inform all registered services of the event
1012 BOOST_FOREACH( NodeListener* i, nodeListeners )
1013 i->onJoinFailed( spovnetId );
1014
1015 return true;
1016 }
1017
1018 // access has been granted -> continue!
1019 logging_info("Join request has been accepted for spovnet " <<
1020 spovnetId.toString() );
1021
1022 logging_debug( "Using bootstrap end-point "
1023 << replyMsg->getBootstrapEndpoint().toString() );
1024
1025 //
1026 // create overlay structure from spovnet parameter set
1027 // if we have not boostrapped yet against some other node
1028 //
1029
1030 if( overlayInterface == NULL ){
1031
1032 logging_debug("first-time bootstrapping");
1033
1034 overlayInterface = OverlayFactory::create(
1035 *this, replyMsg->getParam(), nodeId, this );
1036
1037 // overlay structure supported? no-> fail!
1038 if( overlayInterface == NULL ) {
1039 logging_error( "overlay structure not supported" );
1040
1041 if(bcLink != LinkID::UNSPECIFIED){
1042 bc->dropLink( bcLink );
1043
1044 vector<LinkID>::iterator it = std::find(
1045 bootstrapLinks.begin(), bootstrapLinks.end(), bcLink);
1046 if( it != bootstrapLinks.end() )
1047 bootstrapLinks.erase(it);
1048 }
1049
1050 // inform all registered services of the event
1051 BOOST_FOREACH( NodeListener* i, nodeListeners )
1052 i->onJoinFailed( spovnetId );
1053
1054 return true;
1055 }
1056
1057 // everything ok-> join the overlay!
1058 state = BaseOverlayStateCompleted;
1059 overlayInterface->createOverlay();
1060
1061 overlayInterface->joinOverlay( replyMsg->getBootstrapEndpoint() );
1062
1063 // update ovlvis
1064 //ovl.visChangeNodeColor( ovlId, nodeId, OvlVis::NODE_COLORS_GREEN);
1065
1066 // inform all registered services of the event
1067 BOOST_FOREACH( NodeListener* i, nodeListeners )
1068 i->onJoinCompleted( spovnetId );
1069
1070 } else {
1071
1072 // this is not the first bootstrap, just join the additional node
1073 logging_debug("not first-time bootstrapping");
1074 overlayInterface->joinOverlay( replyMsg->getBootstrapEndpoint() );
1075
1076 } // if( overlayInterface == NULL )
1077
1078 return true;
1079 }
1080
1081 // ---------------------------------------------------------------------
1082 // handle data forward messages
1083 // ---------------------------------------------------------------------
1084 case OverlayMsg::typeData: {
1085
1086 // get service
1087 const ServiceID& service = overlayMsg->getService();
1088 logging_debug( "received data for service " << service.toString() );
1089
1090 // find listener
1091 CommunicationListener* listener =
1092 communicationListeners.get( service );
1093 if( listener == NULL ) return true;
1094
1095 // delegate data message
1096 listener->onMessage( overlayMsg,
1097 overlayMsg->getSourceNode(), ld->overlayId );
1098
1099 return true;
1100 }
1101
1102 // ---------------------------------------------------------------------
1103 // handle update messages for link establishment
1104 // ---------------------------------------------------------------------
1105 case OverlayMsg::typeUpdate: {
1106 logging_debug("Received type update message on link " << ld );
1107
1108 // get info
1109 const NodeID& sourcenode = overlayMsg->getSourceNode();
1110 const ServiceID& service = overlayMsg->getService();
1111
1112 // no link descriptor available -> error!
1113 if( ld == NULL ) {
1114 logging_warn( "received overlay update message for link " <<
1115 ld->overlayId.toString() << " for which we have no mapping" );
1116 return false;
1117 }
1118
1119 // update our link mapping information for this link
1120 bool changed =
1121 ( ld->remoteNode != sourcenode ) || ( ld->service != service );
1122 ld->remoteNode = sourcenode;
1123 ld->service = service;
1124 ld->autolink = overlayMsg->isAutoLink();
1125
1126 // if our link information changed, we send out an update, too
1127 if( changed ) {
1128 OverlayMsg overMsg( OverlayMsg::typeUpdate, ld->service, nodeId );
1129 overMsg.setAutoLink(ld->autolink);
1130 bc->sendMessage( ld->communicationId, &overMsg );
1131 }
1132
1133 // service registered? no-> error!
1134 if( !communicationListeners.contains( service ) ) {
1135 logging_warn( "Link up: event listener has not been registered" );
1136 return false;
1137 }
1138
1139 // default or no service registered?
1140 CommunicationListener* listener = communicationListeners.get( service );
1141 if( listener == NULL || listener == &CommunicationListener::DEFAULT ) {
1142 logging_warn("Link up: event listener is default or null!" );
1143 return true;
1144 }
1145
1146 // update descriptor
1147 ld->listener = listener;
1148 ld->markAsUsed();
1149 ld->markAlive();
1150
1151 // ask the service whether it wants to accept this link
1152 if( !listener->onLinkRequest(sourcenode) ) {
1153
1154 logging_debug("Link id=" << ld->overlayId.toString() <<
1155 " has been denied by service " << service.toString() << ", dropping link");
1156
1157 // prevent onLinkDown calls to the service
1158 ld->listener = &CommunicationListener::DEFAULT;
1159
1160 // drop the link
1161 dropLink( ld->overlayId );
1162 return true;
1163 }
1164
1165 // set link up
1166 ld->up = true;
1167 logging_debug(
1168 "Link " << ld->overlayId.toString()
1169 << " has been accepted by service " << service.toString()
1170 << " and is now up"
1171 );
1172
1173 // auto links: link has been accepted -> send queued messages
1174 if( ld->messageQueue.size() > 0 ) {
1175 logging_info( "sending out queued messages on link " <<
1176 ld->overlayId.toString() );
1177 BOOST_FOREACH( Message* msg, ld->messageQueue ) {
1178 sendMessage( msg, ld->overlayId );
1179 delete msg;
1180 }
1181 ld->messageQueue.clear();
1182 }
1183
1184 // call the notification functions
1185 listener->onLinkUp( ld->overlayId, sourcenode );
1186 sideport->onLinkUp( ld->overlayId, nodeId, sourcenode, this->spovnetId );
1187
1188 return true;
1189 }
1190
1191 // ---------------------------------------------------------------------
1192 // handle link request forwarded through the overlay
1193 // ---------------------------------------------------------------------
1194 case OverlayMsg::typeLinkRequest: {
1195
1196 logging_debug( "received link request on link" );
1197
1198 // decapsulate message
1199 LinkRequest* linkReq = overlayMsg->decapsulate<LinkRequest>();
1200 const ServiceID& service = overlayMsg->getService();
1201
1202 // is request reply?
1203 if ( linkReq->isReply() ) {
1204
1205 // find link
1206 PendingLinkMap::iterator i = pendingLinks.find( linkReq->getNonce() );
1207 if ( i == pendingLinks.end() ) {
1208 logging_error( "Nonce not found in link request" );
1209 return true;
1210 }
1211
1212 // debug message
1213 logging_debug( "Link request reply received. Establishing link "
1214 << i->second << " to " << (linkReq->getEndpoint()->toString())
1215 << " for service " << service.toString()
1216 << " with nonce " << linkReq->getNonce()
1217 << " using relay " << linkReq->getRelay().toString()
1218 << " and remote link id=" << linkReq->getRemoteLinkId()
1219 );
1220
1221 // get descriptor
1222 LinkDescriptor* ldn = getDescriptor(i->second);
1223
1224 // check if link request reply has a relay node ...
1225 if (!linkReq->getRelay().isUnspecified()) { // yes->
1226 ldn->up = true;
1227 ldn->relay = true;
1228 if (ldn->localRelay.isUnspecified()) {
1229 logging_error("On LinkRequest reply: local relay is unspecifed on link " << ldn );
1230 showLinkState();
1231 }
1232 ldn->remoteRelay = linkReq->getRelay();
1233 ldn->remoteLinkId = linkReq->getRemoteLinkId();
1234 ldn->remoteNode = overlayMsg->getSourceNode();
1235
1236 ldn->markAlive();
1237
1238 // compile and send update message
1239 OverlayMsg _overlayMsg( OverlayMsg::typeUpdate, ldn->service, nodeId );
1240 _overlayMsg.setAutoLink(ldn->autolink);
1241 sendMessage( &_overlayMsg, ldn );
1242
1243 // auto links: link has been accepted -> send queued messages
1244 if( ldn->messageQueue.size() > 0 ) {
1245 logging_info( "Sending out queued messages on link " <<
1246 ldn->overlayId.toString() );
1247 BOOST_FOREACH( Message* msg, ldn->messageQueue ) {
1248 sendMessage( msg, ldn->overlayId );
1249 delete msg;
1250 }
1251 ldn->messageQueue.clear();
1252 }
1253
1254 ldn->listener->onLinkUp( ldn->overlayId, ldn->remoteNode );
1255
1256 // try to establish a direct link
1257 ldn->communicationId =
1258 bc->establishLink( *linkReq->getEndpoint(), i->second );
1259 }
1260
1261 // no relay node-> use overlay routing
1262 else {
1263 ldn->up = true;
1264
1265 // establish direct link
1266 ldn->communicationId =
1267 bc->establishLink( *linkReq->getEndpoint(), i->second );
1268 }
1269 } else {
1270 logging_debug( "Link request received from node id="
1271 << overlayMsg->getSourceNode() );
1272
1273 // create link descriptor
1274 LinkDescriptor* ldn =
1275 createLinkDescriptor(overlayMsg->getSourceNode(),
1276 overlayMsg->getService(), LinkID::UNSPECIFIED );
1277 assert(!ldn->overlayId.isUnspecified());
1278
1279 // create reply message
1280 OverlayMsg overlay_msg( OverlayMsg::typeLinkRequest, service, nodeId );
1281 LinkRequest link_request_msg(
1282 linkReq->getNonce(),
1283 &bc->getEndpointDescriptor(),
1284 true, ldn->overlayId, ldn->localRelay
1285 );
1286 overlay_msg.encapsulate( &link_request_msg );
1287
1288 // debug message
1289 logging_debug( "Sending LinkRequest reply for link with nonce " <<
1290 linkReq->getNonce() );
1291
1292 // if this is a relay link-> update information & inform listeners
1293 if (!linkReq->getRelay().isUnspecified()) {
1294 // set flags
1295 ldn->up = true;
1296 ldn->relay = true;
1297 if (ldn->localRelay.isUnspecified()) {
1298 logging_error("On LinkRequest request: local relay is unspecifed on link " << ldn );
1299 showLinkState();
1300 }
1301 ldn->remoteRelay = linkReq->getRelay();
1302 ldn->remoteNode = overlayMsg->getSourceNode();
1303 ldn->remoteLinkId = linkReq->getRemoteLinkId();
1304 ldn->listener->onLinkUp( ldn->overlayId, ldn->remoteNode );
1305 }
1306
1307 // route message back over overlay
1308 sendMessage( &overlay_msg, ldn );
1309 }
1310 return true;
1311 }
1312
1313 // ---------------------------------------------------------------------
1314 // handle relay message to forward messages
1315 // ---------------------------------------------------------------------
1316 case OverlayMsg::typeRelay: {
1317
1318 logging_debug( "received relay request on link" );
1319
1320 // decapsulate message
1321 RelayMessage* relayMsg = overlayMsg->decapsulate<RelayMessage>();
1322
1323 // is relay message informative?
1324 switch (relayMsg->getType()) {
1325
1326 // handle relay notification
1327 case RelayMessage::typeInform: {
1328 logging_info("Received relay information message with"
1329 << " relay " << relayMsg->getRelayNode()
1330 << " destination " << relayMsg->getDestNode() );
1331
1332 // mark incoming link as relay
1333 if (ld!=NULL) ld->markAsRelay();
1334
1335 // am I the destination of this message? yes->
1336 if (relayMsg->getDestNode() == nodeId ) {
1337 // deliver relay message locally!
1338 logging_debug("Relay message reached destination. Handling the message.");
1339 handleMessage( relayMsg, relayMsg->getDestLink(), LinkID::UNSPECIFIED, remoteNode );
1340 return true;
1341 }
1342
1343 // create route message
1344 OverlayMsg _overMsg( *overlayMsg );
1345 RelayMessage _relayMsg( *relayMsg );
1346 _relayMsg.setType( RelayMessage::typeRoute );
1347 _overMsg.encapsulate( &_relayMsg );
1348
1349 // forward message
1350 if (relayMsg->getRelayNode() == nodeId || relayMsg->getRelayNode().isUnspecified()) {
1351 logging_info("Routing relay message to " << relayMsg->getDestNode().toString() );
1352 sendOverlay( &_overMsg, relayMsg->getDestNode() );
1353 } else {
1354 logging_info("Routing relay message to " << relayMsg->getRelayNode().toString() );
1355 sendOverlay( &_overMsg, relayMsg->getRelayNode() );
1356 }
1357 return true;
1358 }
1359
1360 // handle relay routing
1361 case RelayMessage::typeRoute: {
1362 logging_info("Received relay route message with"
1363 << " relay " << relayMsg->getRelayNode()
1364 << " destination " << relayMsg->getDestNode() );
1365
1366 // mark incoming link as relay
1367 if (ld!=NULL) ld->markAsRelay();
1368
1369 // am I the destination of this message? yes->
1370 if (relayMsg->getDestNode() == nodeId ) {
1371 // deliver relay message locally!
1372 logging_debug("Relay message reached destination. Handling the message.");
1373 handleMessage( relayMsg, relayMsg->getDestLink(), LinkID::UNSPECIFIED, remoteNode );
1374 return true;
1375 }
1376
1377 // am I the relay for this message? yes->
1378 if (relayMsg->getRelayNode() == nodeId ) {
1379 logging_debug("I'm the relay for this message. Sending to destination.");
1380 OverlayMsg _overMsg( *overlayMsg );
1381 RelayMessage _relayMsg( *relayMsg );
1382 _overMsg.encapsulate(&_relayMsg);
1383
1384 /// this must be handled by using relay link!
1385 sendOverlay(&_overMsg, relayMsg->getDestNode());
1386 return true;
1387 }
1388
1389 // error: I'm not a relay or destination!
1390 logging_error("This node is neither relay nor destination. Dropping Message!");
1391 return true;
1392 }
1393 default: {
1394 logging_error("RelayMessage Unknown!");
1395 return true;
1396 }
1397 }
1398
1399 break;
1400 }
1401
1402 // ---------------------------------------------------------------------
1403 // handle keep-alive messages
1404 // ---------------------------------------------------------------------
1405 case OverlayMsg::typeKeepAlive: {
1406 logging_debug( "received keep-alive on link" );
1407 if ( ld != NULL ) {
1408 logging_force("Keep-Alive for "<< ld->overlayId);
1409 ld->markAlive();
1410 }
1411 break;
1412 }
1413
1414 // ---------------------------------------------------------------------
1415 // handle direct link replacement messages
1416 // ---------------------------------------------------------------------
1417 case OverlayMsg::typeDirectLink: {
1418
1419 logging_debug( "received direct link replacement request" );
1420
1421 LinkDescriptor* rld = getDescriptor( overlayMsg->getRelayLink() );
1422 logging_force( "Received direct link convert notification for " << rld );
1423
1424 // set communcation link id and set it up
1425 rld->communicationId = ld->communicationId;
1426
1427 // this is neccessary since this link was a relay link before!
1428 rld->communicationUp = true;
1429
1430 // this is not a relay link anymore!
1431 rld->relay = false;
1432 rld->localRelay = NodeID::UNSPECIFIED;
1433 rld->remoteRelay = NodeID::UNSPECIFIED;
1434
1435 // mark used and alive!
1436 rld->markAsUsed();
1437 rld->markAlive();
1438
1439 // erase the original descriptor
1440 eraseDescriptor(ld->overlayId);
1441 break;
1442 }
1443
1444 // ---------------------------------------------------------------------
1445 // handle unknown message type
1446 // ---------------------------------------------------------------------
1447 default: {
1448 logging_error( "received message in invalid state! don't know " <<
1449 "what to do with this message of type " <<
1450 overlayMsg->getType() );
1451 return false;
1452 }
1453
1454 } /* switch */
1455
1456 return false;
1457}
1458
1459// ----------------------------------------------------------------------------
1460
1461void BaseOverlay::broadcastMessage(Message* message, const ServiceID& service) {
1462
1463 logging_debug( "broadcasting message to all known nodes " <<
1464 "in the overlay from service " + service.toString() );
1465
1466 OverlayInterface::NodeList nodes = overlayInterface->getKnownNodes();
1467 OverlayInterface::NodeList::iterator i = nodes.begin();
1468 for(; i != nodes.end(); i++ ) {
1469 if( *i == nodeId) continue; // don't send to ourselfs
1470 sendMessage( message, *i, service );
1471 }
1472}
1473
1474vector<NodeID> BaseOverlay::getOverlayNeighbors(bool deep) const {
1475 // the known nodes _can_ also include our node, so we remove ourself
1476 vector<NodeID> nodes = overlayInterface->getKnownNodes(deep);
1477
1478 vector<NodeID>::iterator i = find( nodes.begin(), nodes.end(), this->nodeId );
1479 if( i != nodes.end() ) nodes.erase( i );
1480
1481 return nodes;
1482}
1483
1484const NodeID& BaseOverlay::getNodeID(const LinkID& lid) const {
1485 if( lid == LinkID::UNSPECIFIED ) return nodeId;
1486 const LinkDescriptor* ld = getDescriptor(lid);
1487 if( ld == NULL ) return NodeID::UNSPECIFIED;
1488 else return ld->remoteNode;
1489}
1490
1491vector<LinkID> BaseOverlay::getLinkIDs( const NodeID& nid ) const {
1492 vector<LinkID> linkvector;
1493 BOOST_FOREACH( LinkDescriptor* ld, links ) {
1494 if( ld->remoteNode == nid || nid == NodeID::UNSPECIFIED ) {
1495 linkvector.push_back( ld->overlayId );
1496 }
1497 }
1498 return linkvector;
1499}
1500
1501
1502void BaseOverlay::onNodeJoin(const NodeID& node) {
1503 JoiningNodes::iterator i = std::find( joiningNodes.begin(), joiningNodes.end(), node );
1504 if( i == joiningNodes.end() ) return;
1505
1506 logging_info( "node has successfully joined baseoverlay and overlay structure "
1507 << node.toString() );
1508
1509 joiningNodes.erase( i );
1510}
1511
1512void BaseOverlay::eventFunction() {
1513
1514 // send keep-alive messages over established links
1515 BOOST_FOREACH( LinkDescriptor* ld, links ) {
1516 if (!ld->up) continue;
1517 OverlayMsg overMsg( OverlayMsg::typeKeepAlive,
1518 OverlayInterface::OVERLAY_SERVICE_ID, nodeId );
1519 sendMessage( &overMsg, ld );
1520 }
1521
1522 // iterate over all links and check for time boundaries
1523 vector<LinkDescriptor*> oldlinks;
1524 time_t now = time(NULL);
1525 BOOST_FOREACH( LinkDescriptor* ld, links ) {
1526 // remote used as relay flag
1527 if ( ld->usedAsRelay && difftime( now, ld->timeUsedAsRelay ) > 10)
1528 ld->usedAsRelay = false;
1529
1530 // keep alives and not up? yes-> link connection request is stale!
1531 if ( !ld->up && difftime( now, ld->keepAliveTime ) > 2 ) {
1532
1533 // increase counter
1534 ld->keepAliveMissed++;
1535
1536 // missed more than four keep-alive messages (4 sec)? -> drop link
1537 if (ld->keepAliveMissed > 10) {
1538 logging_force( "Link connection request is stale, closing: " << ld );
1539 oldlinks.push_back( ld );
1540 }
1541 }
1542
1543 if (!ld->up) continue;
1544
1545 // drop links that are dropped and not used as relay
1546 if (ld->dropWhenRelaysLeft && !ld->usedAsRelay && !ld->autolink)
1547 oldlinks.push_back( ld );
1548 else
1549
1550 // auto-link time exceeded?
1551 if ( ld->autolink && difftime( now, ld->lastuse ) > 30 )
1552 oldlinks.push_back( ld );
1553
1554 // keep alives missed? yes->
1555 if ( difftime( now, ld->keepAliveTime ) > 2 ) {
1556
1557 // increase counter
1558 ld->keepAliveMissed++;
1559
1560 // missed more than four keep-alive messages (4 sec)? -> drop link
1561 if (ld->keepAliveMissed >= 8) {
1562 logging_force( "Link is stale, closing: " << ld );
1563 oldlinks.push_back( ld );
1564 }
1565 }
1566 }
1567
1568 // show link state
1569 counter++;
1570 if (counter>=4) showLinkState();
1571 if (counter>=4 || counter<0) counter = 0;
1572
1573 // drop links
1574 BOOST_FOREACH( const LinkDescriptor* ld, oldlinks ) {
1575
1576 vector<LinkID>::iterator it = std::find(
1577 bootstrapLinks.begin(), bootstrapLinks.end(), ld->communicationId);
1578
1579 if (!ld->communicationId.isUnspecified() && it != bootstrapLinks.end() ){
1580 logging_force( "Not dropping initiator link: " << ld );
1581 continue;
1582 }
1583 logging_force( "Link timed out. Dropping " << ld );
1584 dropLink( ld->overlayId );
1585 }
1586}
1587
1588void BaseOverlay::showLinkState() {
1589 int i=0;
1590 logging_force("--- link state -------------------------------");
1591 BOOST_FOREACH( LinkDescriptor* ld, links ) {
1592 logging_force("link " << i << ": " << ld);
1593 i++;
1594 }
1595 logging_force("----------------------------------------------");
1596}
1597
1598}} // namespace ariba, overlay
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