source: source/ariba/overlay/BaseOverlay.cpp@ 5912

Last change on this file since 5912 was 5912, checked in by mies, 15 years ago
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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
52#include "ariba/overlay/messages/OverlayMsg.h"
53#include "ariba/overlay/messages/JoinRequest.h"
54#include "ariba/overlay/messages/JoinReply.h"
55
56#include "ariba/utility/misc/OvlVis.h"
57
58namespace ariba {
59namespace overlay {
60
61/* *****************************************************************************
62 * PREREQUESITES
63 * ****************************************************************************/
64
65CommunicationListener* BaseOverlay::getListener( const ServiceID& service ) {
66 if( !communicationListeners.contains( service ) ) {
67 logging_error( "No listener found for service " << service.toString() );
68 return NULL;
69 }
70 CommunicationListener* listener = communicationListeners.get( service );
71 assert( listener != NULL );
72 return listener;
73}
74
75// link descriptor handling ----------------------------------------------------
76
77LinkDescriptor* BaseOverlay::getDescriptor( const LinkID& link, bool communication ) {
78 BOOST_FOREACH( LinkDescriptor* lp, links )
79 if ((communication ? lp->communicationId : lp->overlayId) == link)
80 return lp;
81 return NULL;
82}
83
84const LinkDescriptor* BaseOverlay::getDescriptor( const LinkID& link, bool communication ) const {
85 BOOST_FOREACH( const LinkDescriptor* lp, links )
86 if ((communication ? lp->communicationId : lp->overlayId) == link)
87 return lp;
88 return NULL;
89}
90
91/// erases a link descriptor
92void BaseOverlay::eraseDescriptor( const LinkID& link, bool communication ) {
93 for ( vector<LinkDescriptor*>::iterator i = links.begin(); i!= links.end(); i++) {
94 LinkDescriptor* ld = *i;
95 if ((communication ? ld->communicationId : ld->overlayId) == link) {
96 delete ld;
97 links.erase(i);
98 break;
99 }
100 }
101}
102
103/// adds a link descriptor
104LinkDescriptor* BaseOverlay::addDescriptor( const LinkID& link ) {
105 LinkDescriptor* desc = getDescriptor( link );
106 if ( desc == NULL ) {
107 desc = new LinkDescriptor();
108 if (!link.isUnspecified()) desc->overlayId = link;
109 links.push_back(desc);
110 }
111 return desc;
112}
113
114/// returns a auto-link descriptor
115LinkDescriptor* BaseOverlay::getAutoDescriptor( const NodeID& node, const ServiceID& service ) {
116 // search for a descriptor that is already up
117 BOOST_FOREACH( LinkDescriptor* lp, links )
118 if (lp->autolink && lp->remoteNode == node && lp->service == service && lp->up && lp->keepAliveMissed == 0)
119 return lp;
120 // if not found, search for one that is about to come up...
121 BOOST_FOREACH( LinkDescriptor* lp, links )
122 if (lp->autolink && lp->remoteNode == node && lp->service == service && lp->keepAliveMissed == 0 )
123 return lp;
124 return NULL;
125}
126
127/// stabilizes link information
128void BaseOverlay::stabilizeLinks() {
129 // send keep-alive messages over established links
130 BOOST_FOREACH( LinkDescriptor* ld, links ) {
131 if (!ld->up) continue;
132 OverlayMsg msg( OverlayMsg::typeLinkAlive,
133 OverlayInterface::OVERLAY_SERVICE_ID, nodeId, ld->remoteNode );
134 if (ld->relayed) msg.setRouteRecord(true);
135 send_link( &msg, ld->overlayId );
136 }
137
138 // iterate over all links and check for time boundaries
139 vector<LinkDescriptor*> oldlinks;
140 time_t now = time(NULL);
141 BOOST_FOREACH( LinkDescriptor* ld, links ) {
142
143 // keep alives and not up? yes-> link connection request is stale!
144 if ( !ld->up && difftime( now, ld->keepAliveTime ) >= 2 ) {
145
146 // increase counter
147 ld->keepAliveMissed++;
148
149 // missed more than four keep-alive messages (10 sec)? -> drop link
150 if (ld->keepAliveMissed > 4) {
151 logging_info( "Link connection request is stale, closing: " << ld );
152 oldlinks.push_back( ld );
153 continue;
154 }
155 }
156
157 if (!ld->up) continue;
158
159 // remote used as relay flag
160 if ( ld->relaying && difftime( now, ld->timeRelaying ) > 10)
161 ld->relaying = false;
162
163 // drop links that are dropped and not used as relay
164 if (ld->dropAfterRelaying && !ld->relaying && !ld->autolink) {
165 oldlinks.push_back( ld );
166 continue;
167 }
168
169 // auto-link time exceeded?
170 if ( ld->autolink && difftime( now, ld->lastuse ) > 30 ) {
171 oldlinks.push_back( ld );
172 continue;
173 }
174
175 // keep alives missed? yes->
176 if ( difftime( now, ld->keepAliveTime ) > 2 ) {
177
178 // increase counter
179 ld->keepAliveMissed++;
180
181 // missed more than four keep-alive messages (4 sec)? -> drop link
182 if (ld->keepAliveMissed >= 4) {
183 logging_info( "Link is stale, closing: " << ld );
184 oldlinks.push_back( ld );
185 continue;
186 }
187 }
188 }
189
190 // drop links
191 BOOST_FOREACH( LinkDescriptor* ld, oldlinks ) {
192 logging_info( "Link timed out. Dropping " << ld );
193 ld->relaying = false;
194 dropLink( ld->overlayId );
195 }
196
197 // show link state
198 counter++;
199 if (counter>=4) showLinks();
200 if (counter>=4 || counter<0) counter = 0;
201}
202
203/// shows the current link state
204void BaseOverlay::showLinks() {
205 int i=0;
206 logging_info("--- link state -------------------------------");
207 BOOST_FOREACH( LinkDescriptor* ld, links ) {
208 logging_info("link " << i << ": " << ld);
209 i++;
210 }
211 logging_info("----------------------------------------------");
212}
213
214/// compares two arbitrary links to the same node
215int BaseOverlay::compare( const LinkID& lhs, const LinkID& rhs ) {
216 LinkDescriptor* lhsld = getDescriptor(lhs);
217 LinkDescriptor* rhsld = getDescriptor(rhs);
218 if (lhsld==NULL || rhsld==NULL
219 || !lhsld->up || !rhsld->up
220 || lhsld->remoteNode != rhsld->remoteNode) return -1;
221
222 if ((lhsld->remoteLink^lhsld->overlayId)<(rhsld->remoteLink^lhsld->overlayId) )
223 return -1;
224
225 return 1;
226}
227
228
229// internal message delivery ---------------------------------------------------
230
231/// routes a message to its destination node
232void BaseOverlay::route( OverlayMsg* message ) {
233
234 // exceeded time-to-live? yes-> drop message
235 if (message->getNumHops() > message->getTimeToLive()) {
236 logging_warn("Message exceeded TTL. Dropping message and relay routes"
237 "for recovery.");
238 removeRelayNode(message->getDestinationNode());
239 return;
240 }
241
242 // no-> forward message
243 else {
244 // destinastion myself? yes-> handle message
245 if (message->getDestinationNode() == nodeId) {
246 logging_warn("Usually I should not route messages to myself!");
247 Message msg;
248 msg.encapsulate(message);
249 handleMessage( &msg, NULL );
250 } else {
251 // no->send message to next hop
252 send( message, message->getDestinationNode() );
253 }
254 }
255}
256
257/// sends a message to another node, delivers it to the base overlay class
258seqnum_t BaseOverlay::send( OverlayMsg* message, const NodeID& destination ) {
259 LinkDescriptor* next_link = NULL;
260
261 // drop messages to unspecified destinations
262 if (destination.isUnspecified()) return -1;
263
264 // send messages to myself -> handle message and drop warning!
265 if (destination == nodeId) {
266 logging_warn("Sent message to myself. Handling message.")
267 Message msg;
268 msg.encapsulate(message);
269 handleMessage( &msg, NULL );
270 return -1;
271 }
272
273 // use relay path?
274 if (message->isRelayed()) {
275 next_link = getRelayLinkTo( destination );
276 if (next_link != NULL) {
277 next_link->setRelaying();
278 return bc->sendMessage(next_link->communicationId, message);
279 } else {
280 logging_error("Could not send message. No relay hop found to "
281 << destination)
282 return -1;
283 }
284 }
285
286 // routed message
287 else {
288 // no-> relay path! route over overlay path
289 LinkID next_id = overlayInterface->getNextLinkId( destination );
290 if (next_id.isUnspecified()) {
291 logging_error("Could not send message. No next hop found to " <<
292 destination );
293 return -1;
294 }
295
296 // get link descriptor, up and running? yes-> send message
297 next_link = getDescriptor(next_id);
298 if (next_link != NULL && next_link->up) {
299 // send message over relayed link
300 return send(message, next_link);
301 }
302
303 // no-> error, dropping message
304 else {
305 logging_error("Could not send message. Link not known or up");
306 return -1;
307 }
308 }
309
310 // not reached-> fail
311 return -1;
312}
313
314/// send a message using a link descriptor, delivers it to the base overlay class
315seqnum_t BaseOverlay::send( OverlayMsg* message, LinkDescriptor* ldr, bool ignore_down ) {
316 // check if null
317 if (ldr == NULL) {
318 logging_error("Can not send message to " << message->getDestinationAddress());
319 return -1;
320 }
321
322 // check if up
323 if (!ldr->up && !ignore_down) {
324 logging_error("Can not send message. Link not up:" << ldr );
325 return -1;
326 }
327 LinkDescriptor* ld = NULL;
328
329 // handle relayed link
330 if (ldr->relayed) {
331 logging_debug("Resolving direct link for relayed link to "
332 << ldr->remoteNode);
333 ld = getRelayLinkTo( ldr->remoteNode );
334 if (ld==NULL) {
335 logging_error("No relay path found to link " << ldr );
336 return -1;
337 }
338 ld->setRelaying();
339 message->setRelayed(true);
340 } else
341 ld = ldr;
342
343 // handle direct link
344 if (ld->communicationUp) {
345 logging_debug("send(): Sending message over direct link.");
346 return bc->sendMessage( ld->communicationId, message );
347 } else {
348 logging_error("send(): Could not send message. "
349 "Not a relayed link and direct link is not up.");
350 return -1;
351 }
352 return -1;
353}
354
355seqnum_t BaseOverlay::send_node( OverlayMsg* message, const NodeID& remote,
356 const ServiceID& service) {
357 message->setSourceNode(nodeId);
358 message->setDestinationNode(remote);
359 message->setService(service);
360 send( message, remote );
361}
362
363seqnum_t BaseOverlay::send_link( OverlayMsg* message, const LinkID& link,bool ignore_down ) {
364 LinkDescriptor* ld = getDescriptor(link);
365 if (ld==NULL) {
366 logging_error("Cannot find descriptor to link id=" << link.toString());
367 return -1;
368 }
369 message->setSourceNode(nodeId);
370 message->setDestinationNode(ld->remoteNode);
371
372 message->setSourceLink(ld->overlayId);
373 message->setDestinationLink(ld->remoteLink);
374
375 message->setService(ld->service);
376 message->setRelayed(ld->relayed);
377 return send( message, ld, ignore_down );
378}
379
380// relay route management ------------------------------------------------------
381
382/// stabilize relay information
383void BaseOverlay::stabilizeRelays() {
384 vector<relay_route>::iterator i = relay_routes.begin();
385 while (i!=relay_routes.end() ) {
386 relay_route& route = *i;
387 LinkDescriptor* ld = getDescriptor(route.link);
388 if (ld==NULL
389 || !ld->up
390 || ld->keepAliveMissed != 0
391 || !ld->communicationUp
392 || difftime(route.used, time(NULL)) > 4) {
393 logging_info("Forgetting relay information to node "
394 << route.node.toString() );
395 i = relay_routes.erase(i);
396 } else
397 i++;
398 }
399}
400
401void BaseOverlay::removeRelayLink( const LinkID& link ) {
402 vector<relay_route>::iterator i = relay_routes.begin();
403 while (i!=relay_routes.end() ) {
404 relay_route& route = *i;
405 if (route.link == link ) i = relay_routes.erase(i); else i++;
406 }
407}
408
409void BaseOverlay::removeRelayNode( const NodeID& remote ) {
410 vector<relay_route>::iterator i = relay_routes.begin();
411 while (i!=relay_routes.end() ) {
412 relay_route& route = *i;
413 if (route.node == remote ) i = relay_routes.erase(i); else i++;
414 }
415}
416
417/// refreshes relay information
418void BaseOverlay::refreshRelayInformation( const OverlayMsg* message, LinkDescriptor* ld ) {
419
420 // handle relayed messages from real links only
421 if (ld == NULL
422 || ld->relayed
423 || message->getSourceNode()==nodeId ) return;
424
425 // update usage information
426 if (message->isRelayed()) {
427 // try to find source node
428 BOOST_FOREACH( relay_route& route, relay_routes ) {
429 // relay route found? yes->
430 if ( route.node == message->getDestinationNode() ) {
431 ld->setRelaying();
432 route.used = time(NULL);
433 }
434 }
435
436 }
437
438 // register relay path
439 if (message->isRegisterRelay()) {
440 // set relaying
441 ld->setRelaying();
442
443 // try to find source node
444 BOOST_FOREACH( relay_route& route, relay_routes ) {
445
446 // relay route found? yes->
447 if ( route.node == message->getSourceNode() ) {
448
449 // refresh timer
450 route.used = time(NULL);
451
452 // route has a shorter hop count? yes-> replace
453 if (route.hops > message->getNumHops() ) {
454 logging_info("Updating relay information to node "
455 << route.node.toString()
456 << " reducing to " << message->getNumHops() << " hops.");
457 route.hops = message->getNumHops();
458 route.link = ld->overlayId;
459 }
460 return;
461 }
462 }
463
464 // not found-> add new entry
465 relay_route route;
466 route.hops = message->getNumHops();
467 route.link = ld->overlayId;
468 route.node = message->getSourceNode();
469 route.used = time(NULL);
470 logging_info("Remembering relay information to node "
471 << route.node.toString());
472 relay_routes.push_back(route);
473 }
474}
475
476/// returns a known "vital" relay link which is up and running
477LinkDescriptor* BaseOverlay::getRelayLinkTo( const NodeID& remote ) {
478 // try to find source node
479 BOOST_FOREACH( relay_route& route, relay_routes ) {
480 if (route.node == remote ) {
481 LinkDescriptor* ld = getDescriptor( route.link );
482 if (ld==NULL || !ld->up || !ld->communicationUp) return NULL; else {
483 route.used = time(NULL);
484 return ld;
485 }
486 }
487 }
488 return NULL;
489}
490
491/* *****************************************************************************
492 * PUBLIC MEMBERS
493 * ****************************************************************************/
494
495use_logging_cpp(BaseOverlay);
496
497// ----------------------------------------------------------------------------
498
499BaseOverlay::BaseOverlay() :
500 bc(NULL), overlayInterface(NULL), nodeId(NodeID::UNSPECIFIED),
501 spovnetId(SpoVNetID::UNSPECIFIED), state(BaseOverlayStateInvalid),
502 sideport(&SideportListener::DEFAULT), started(false), counter(0) {
503}
504
505BaseOverlay::~BaseOverlay() {
506}
507
508// ----------------------------------------------------------------------------
509
510void BaseOverlay::start( BaseCommunication& _basecomm, const NodeID& _nodeid ) {
511 logging_info("Starting...");
512
513 // set parameters
514 bc = &_basecomm;
515 nodeId = _nodeid;
516
517 // register at base communication
518 bc->registerMessageReceiver( this );
519 bc->registerEventListener( this );
520
521 // timer for auto link management
522 Timer::setInterval( 1000 );
523 Timer::start();
524
525 started = true;
526 state = BaseOverlayStateInvalid;
527}
528
529void BaseOverlay::stop() {
530 logging_info("Stopping...");
531
532 // stop timer
533 Timer::stop();
534
535 // delete oberlay interface
536 if(overlayInterface != NULL) {
537 delete overlayInterface;
538 overlayInterface = NULL;
539 }
540
541 // unregister at base communication
542 bc->unregisterMessageReceiver( this );
543 bc->unregisterEventListener( this );
544
545 started = false;
546 state = BaseOverlayStateInvalid;
547}
548
549bool BaseOverlay::isStarted(){
550 return started;
551}
552
553// ----------------------------------------------------------------------------
554
555void BaseOverlay::joinSpoVNet(const SpoVNetID& id,
556 const EndpointDescriptor& bootstrapEp) {
557
558 if(id != spovnetId){
559 logging_error("attempt to join against invalid spovnet, call initiate first");
560 return;
561 }
562
563
564 //ovl.visShowNodeBubble ( ovlId, nodeId, "joining..." );
565 logging_info( "Starting to join spovnet " << id.toString() <<
566 " with nodeid " << nodeId.toString());
567
568 if(bootstrapEp.isUnspecified() && state == BaseOverlayStateInvalid){
569
570 // bootstrap against ourselfs
571 logging_debug("joining spovnet locally");
572
573 overlayInterface->joinOverlay();
574 state = BaseOverlayStateCompleted;
575 BOOST_FOREACH( NodeListener* i, nodeListeners )
576 i->onJoinCompleted( spovnetId );
577
578 //ovl.visChangeNodeIcon ( ovlId, nodeId, OvlVis::ICON_ID_CAMERA );
579 //ovl.visChangeNodeColor( ovlId, nodeId, OvlVis::NODE_COLORS_GREEN );
580
581 logging_debug("starting overlay bootstrap module");
582 overlayBootstrap.start(this, spovnetId, nodeId);
583 overlayBootstrap.publish(bc->getEndpointDescriptor());
584
585 } else {
586
587 // bootstrap against another node
588 logging_debug("joining spovnet remotely against " << bootstrapEp.toString());
589
590 const LinkID& lnk = bc->establishLink( bootstrapEp );
591 bootstrapLinks.push_back(lnk);
592 logging_info("join process initiated for " << id.toString() << "...");
593 }
594}
595
596void BaseOverlay::leaveSpoVNet() {
597
598 logging_info( "Leaving spovnet " << spovnetId );
599 bool ret = ( state != this->BaseOverlayStateInvalid );
600
601 logging_debug("stopping overlay bootstrap module");
602 overlayBootstrap.stop();
603 overlayBootstrap.revoke();
604
605 logging_debug( "Dropping all auto-links" );
606
607 // gather all service links
608 vector<LinkID> servicelinks;
609 BOOST_FOREACH( LinkDescriptor* ld, links ) {
610 if( ld->service != OverlayInterface::OVERLAY_SERVICE_ID )
611 servicelinks.push_back( ld->overlayId );
612 }
613
614 // drop all service links
615 BOOST_FOREACH( LinkID lnk, servicelinks )
616 dropLink( lnk );
617
618 // let the node leave the spovnet overlay interface
619 logging_debug( "Leaving overlay" );
620 if( overlayInterface != NULL )
621 overlayInterface->leaveOverlay();
622
623 // drop still open bootstrap links
624 BOOST_FOREACH( LinkID lnk, bootstrapLinks )
625 bc->dropLink( lnk );
626
627 // change to inalid state
628 state = BaseOverlayStateInvalid;
629 //ovl.visShutdown( ovlId, nodeId, string("") );
630
631 // inform all registered services of the event
632 BOOST_FOREACH( NodeListener* i, nodeListeners ) {
633 if( ret ) i->onLeaveCompleted( spovnetId );
634 else i->onLeaveFailed( spovnetId );
635 }
636}
637
638void BaseOverlay::createSpoVNet(const SpoVNetID& id,
639 const OverlayParameterSet& param,
640 const SecurityParameterSet& sec,
641 const QoSParameterSet& qos) {
642
643 // set the state that we are an initiator, this way incoming messages are
644 // handled correctly
645 logging_info( "creating spovnet " + id.toString() <<
646 " with nodeid " << nodeId.toString() );
647
648 spovnetId = id;
649
650 overlayInterface = OverlayFactory::create( *this, param, nodeId, this );
651 if( overlayInterface == NULL ) {
652 logging_fatal( "overlay structure not supported" );
653 state = BaseOverlayStateInvalid;
654
655 BOOST_FOREACH( NodeListener* i, nodeListeners )
656 i->onJoinFailed( spovnetId );
657
658 return;
659 }
660}
661
662// ----------------------------------------------------------------------------
663
664const LinkID BaseOverlay::establishLink( const EndpointDescriptor& remoteEp,
665 const NodeID& remoteId, const ServiceID& service ) {
666
667 // establish link via overlay
668 if (!remoteId.isUnspecified())
669 return establishLink( remoteId, service );
670 else
671
672 // establish link directly if only ep is known
673 if (remoteId.isUnspecified())
674 return establishDirectLink(remoteEp, service );
675
676}
677
678/// call base communication's establish link and add link mapping
679const LinkID BaseOverlay::establishDirectLink( const EndpointDescriptor& ep,
680 const ServiceID& service ) {
681
682 /// find a service listener
683 if( !communicationListeners.contains( service ) ) {
684 logging_error( "No listener registered for service id=" << service.toString() );
685 return LinkID::UNSPECIFIED;
686 }
687 CommunicationListener* listener = communicationListeners.get( service );
688 assert( listener != NULL );
689
690 // create descriptor
691 LinkDescriptor* ld = addDescriptor();
692 ld->relayed = false;
693 ld->listener = listener;
694 ld->service = service;
695 ld->communicationId = bc->establishLink( ep );
696
697 /// establish link and add mapping
698 logging_info("Establishing direct link " << ld->communicationId.toString()
699 << " using " << ep.toString());
700
701 return ld->communicationId;
702}
703
704/// establishes a link between two arbitrary nodes
705const LinkID BaseOverlay::establishLink( const NodeID& remote,
706 const ServiceID& service ) {
707
708 // do not establish a link to myself!
709 if (remote == nodeId) return LinkID::UNSPECIFIED;
710
711 // create a link descriptor
712 LinkDescriptor* ld = addDescriptor();
713 ld->relayed = true;
714 ld->remoteNode = remote;
715 ld->service = service;
716 ld->listener = getListener(ld->service);
717
718 // create link request message
719 OverlayMsg msg(OverlayMsg::typeLinkRequest, service, nodeId, remote );
720 msg.setSourceLink(ld->overlayId);
721 msg.setRelayed(true);
722
723 // debug message
724 logging_info(
725 "Sending link request with"
726 << " link=" << ld->overlayId.toString()
727 << " node=" << ld->remoteNode.toString()
728 << " serv=" << ld->service.toString()
729 );
730
731 // sending message to node
732 send_node( &msg, ld->remoteNode, ld->service );
733
734 return ld->overlayId;
735}
736
737/// drops an established link
738void BaseOverlay::dropLink(const LinkID& link) {
739 logging_info( "Dropping link (initiated locally):" << link.toString() );
740
741 // find the link item to drop
742 LinkDescriptor* ld = getDescriptor(link);
743 if( ld == NULL ) {
744 logging_warn( "Can't drop link, link is unknown!");
745 return;
746 }
747
748 // delete all queued messages
749 if( ld->messageQueue.size() > 0 ) {
750 logging_warn( "Dropping link " << ld->overlayId.toString() << " that has "
751 << ld->messageQueue.size() << " waiting messages" );
752 ld->flushQueue();
753 }
754
755 // inform sideport and listener
756 ld->listener->onLinkDown( ld->overlayId, ld->remoteNode );
757 sideport->onLinkDown(ld->overlayId, this->nodeId, ld->remoteNode, this->spovnetId );
758
759 // do not drop relay links
760 if (!ld->relaying) {
761 // drop the link in base communication
762 if (ld->communicationUp) bc->dropLink( ld->communicationId );
763
764 // erase descriptor
765 eraseDescriptor( ld->overlayId );
766 } else {
767 ld->dropAfterRelaying = true;
768 }
769}
770
771// ----------------------------------------------------------------------------
772
773/// internal send message, always use this functions to send messages over links
774seqnum_t BaseOverlay::sendMessage( const Message* message, const LinkID& link ) {
775 logging_debug( "Sending data message on link " << link.toString() );
776
777 // get the mapping for this link
778 LinkDescriptor* ld = getDescriptor(link);
779 if( ld == NULL ) {
780 logging_error("Could not send message. "
781 << "Link not found id=" << link.toString());
782 return -1;
783 }
784
785 // check if the link is up yet, if its an auto link queue message
786 if( !ld->up ) {
787 ld->setAutoUsed();
788 if( ld->autolink ) {
789 logging_info("Auto-link " << link.toString() << " not up, queue message");
790 Data data = data_serialize( message );
791 const_cast<Message*>(message)->dropPayload();
792 ld->messageQueue.push_back( new Message(data) );
793 } else {
794 logging_error("Link " << link.toString() << " not up, drop message");
795 }
796 return -1;
797 }
798
799 // compile overlay message (has service and node id)
800 OverlayMsg overmsg( OverlayMsg::typeData );
801 overmsg.encapsulate( const_cast<Message*>(message) );
802
803 // send message over relay/direct/overlay
804 return send_link( &overmsg, ld->overlayId );
805}
806
807seqnum_t BaseOverlay::sendMessage(const Message* message,
808 const NodeID& node, const ServiceID& service) {
809
810 // find link for node and service
811 LinkDescriptor* ld = getAutoDescriptor( node, service );
812
813 // if we found no link, create an auto link
814 if( ld == NULL ) {
815
816 // debug output
817 logging_info( "No link to send message to node "
818 << node.toString() << " found for service "
819 << service.toString() << ". Creating auto link ..."
820 );
821
822 // call base overlay to create a link
823 LinkID link = establishLink( node, service );
824 ld = getDescriptor( link );
825 if( ld == NULL ) {
826 logging_error( "Failed to establish auto-link.");
827 return -1;
828 }
829 ld->autolink = true;
830
831 logging_debug( "Auto-link establishment in progress to node "
832 << node.toString() << " with link id=" << link.toString() );
833 }
834 assert(ld != NULL);
835
836 // mark the link as used, as we now send a message through it
837 ld->setAutoUsed();
838
839 // send / queue message
840 return sendMessage( message, ld->overlayId );
841}
842
843// ----------------------------------------------------------------------------
844
845const EndpointDescriptor& BaseOverlay::getEndpointDescriptor(
846 const LinkID& link) const {
847
848 // return own end-point descriptor
849 if( link == LinkID::UNSPECIFIED )
850 return bc->getEndpointDescriptor();
851
852 // find link descriptor. not found -> return unspecified
853 const LinkDescriptor* ld = getDescriptor(link);
854 if (ld==NULL) return EndpointDescriptor::UNSPECIFIED();
855
856 // return endpoint-descriptor from base communication
857 return bc->getEndpointDescriptor( ld->communicationId );
858}
859
860const EndpointDescriptor& BaseOverlay::getEndpointDescriptor(
861 const NodeID& node) const {
862
863 // return own end-point descriptor
864 if( node == nodeId || node == NodeID::UNSPECIFIED )
865 return bc->getEndpointDescriptor();
866
867 // no joined and request remote descriptor? -> fail!
868 if( overlayInterface == NULL ) {
869 logging_error( "overlay interface not set, cannot resolve endpoint" );
870 return EndpointDescriptor::UNSPECIFIED();
871 }
872
873 // resolve end-point descriptor from the base-overlay routing table
874 return overlayInterface->resolveNode( node );
875}
876
877// ----------------------------------------------------------------------------
878
879bool BaseOverlay::registerSidePort(SideportListener* _sideport) {
880 sideport = _sideport;
881 _sideport->configure( this );
882}
883
884bool BaseOverlay::unregisterSidePort(SideportListener* _sideport) {
885 sideport = &SideportListener::DEFAULT;
886}
887
888// ----------------------------------------------------------------------------
889
890bool BaseOverlay::bind(CommunicationListener* listener, const ServiceID& sid) {
891 logging_debug( "binding communication listener " << listener
892 << " on serviceid " << sid.toString() );
893
894 if( communicationListeners.contains( sid ) ) {
895 logging_error( "some listener already registered for service id "
896 << sid.toString() );
897 return false;
898 }
899
900 communicationListeners.registerItem( listener, sid );
901 return true;
902}
903
904
905bool BaseOverlay::unbind(CommunicationListener* listener, const ServiceID& sid) {
906 logging_debug( "unbinding listener " << listener << " from serviceid " << sid.toString() );
907
908 if( !communicationListeners.contains( sid ) ) {
909 logging_warn( "cannot unbind listener. no listener registered on service id " << sid.toString() );
910 return false;
911 }
912
913 if( communicationListeners.get(sid) != listener ) {
914 logging_warn( "listener bound to service id " << sid.toString()
915 << " is different than listener trying to unbind" );
916 return false;
917 }
918
919 communicationListeners.unregisterItem( sid );
920 return true;
921}
922
923// ----------------------------------------------------------------------------
924
925bool BaseOverlay::bind(NodeListener* listener) {
926 logging_debug( "Binding node listener " << listener );
927
928 // already bound? yes-> warning
929 NodeListenerVector::iterator i =
930 find( nodeListeners.begin(), nodeListeners.end(), listener );
931 if( i != nodeListeners.end() ) {
932 logging_warn("Node listener " << listener << " is already bound!" );
933 return false;
934 }
935
936 // no-> add
937 nodeListeners.push_back( listener );
938 return true;
939}
940
941bool BaseOverlay::unbind(NodeListener* listener) {
942 logging_debug( "Unbinding node listener " << listener );
943
944 // already unbound? yes-> warning
945 NodeListenerVector::iterator i = find( nodeListeners.begin(), nodeListeners.end(), listener );
946 if( i == nodeListeners.end() ) {
947 logging_warn( "Node listener " << listener << " is not bound!" );
948 return false;
949 }
950
951 // no-> remove
952 nodeListeners.erase( i );
953 return true;
954}
955
956// ----------------------------------------------------------------------------
957
958void BaseOverlay::onLinkUp(const LinkID& id,
959 const address_v* local, const address_v* remote) {
960 logging_debug( "Link up with base communication link id=" << id );
961
962 // get descriptor for link
963 LinkDescriptor* ld = getDescriptor(id, true);
964
965 // handle bootstrap link we initiated
966 if( std::find(bootstrapLinks.begin(), bootstrapLinks.end(), id) != bootstrapLinks.end() ){
967 logging_info(
968 "Join has been initiated by me and the link is now up. " <<
969 "Sending out join request for SpoVNet " << spovnetId.toString()
970 );
971
972 // send join request message
973 OverlayMsg overlayMsg( OverlayMsg::typeJoinRequest,
974 OverlayInterface::OVERLAY_SERVICE_ID, nodeId );
975 JoinRequest joinRequest( spovnetId, nodeId );
976 overlayMsg.encapsulate( &joinRequest );
977 bc->sendMessage( id, &overlayMsg );
978 return;
979 }
980
981 // no link found? -> link establishment from remote, add one!
982 if (ld == NULL) {
983 ld = addDescriptor( id );
984 logging_info( "onLinkUp (remote request) descriptor: " << ld );
985
986 // update descriptor
987 ld->fromRemote = true;
988 ld->communicationId = id;
989 ld->communicationUp = true;
990 ld->setAutoUsed();
991 ld->setAlive();
992
993 // in this case, do not inform listener, since service it unknown
994 // -> wait for update message!
995
996 // link mapping found? -> send update message with node-id and service id
997 } else {
998 logging_info( "onLinkUp descriptor (initiated locally):" << ld );
999
1000 // update descriptor
1001 ld->setAutoUsed();
1002 ld->setAlive();
1003 ld->communicationUp = true;
1004 ld->fromRemote = false;
1005
1006 // if link is a relayed link->convert to direct link
1007 if (ld->relayed) {
1008 logging_info( "Converting to direct link: " << ld );
1009 ld->up = true;
1010 ld->relayed = false;
1011 OverlayMsg overMsg( OverlayMsg::typeLinkDirect );
1012 overMsg.setSourceLink( ld->overlayId );
1013 overMsg.setDestinationLink( ld->remoteLink );
1014 send_link( &overMsg, ld->overlayId );
1015 } else {
1016 // note: necessary to validate the link on the remote side!
1017 logging_info( "Sending out update" <<
1018 " for service " << ld->service.toString() <<
1019 " with local node id " << nodeId.toString() <<
1020 " on link " << ld->overlayId.toString() );
1021
1022 // compile and send update message
1023 OverlayMsg overlayMsg( OverlayMsg::typeLinkUpdate );
1024 overlayMsg.setSourceLink(ld->overlayId);
1025 overlayMsg.setAutoLink( ld->autolink );
1026 send_link( &overlayMsg, ld->overlayId, true );
1027 }
1028 }
1029}
1030
1031void BaseOverlay::onLinkDown(const LinkID& id,
1032 const address_v* local, const address_v* remote) {
1033
1034 // erase bootstrap links
1035 vector<LinkID>::iterator it = std::find( bootstrapLinks.begin(), bootstrapLinks.end(), id );
1036 if( it != bootstrapLinks.end() ) bootstrapLinks.erase( it );
1037
1038 // get descriptor for link
1039 LinkDescriptor* ld = getDescriptor(id, true);
1040 if ( ld == NULL ) return; // not found? ->ignore!
1041 logging_info( "onLinkDown descriptor: " << ld );
1042
1043 // removing relay link information
1044 removeRelayLink(ld->overlayId);
1045
1046 // inform listeners about link down
1047 ld->communicationUp = false;
1048 if (!ld->service.isUnspecified()) {
1049 getListener(ld->service)->onLinkDown( ld->overlayId, ld->remoteNode );
1050 sideport->onLinkDown( id, this->nodeId, ld->remoteNode, this->spovnetId );
1051 }
1052
1053 // delete all queued messages (auto links)
1054 if( ld->messageQueue.size() > 0 ) {
1055 logging_warn( "Dropping link " << id.toString() << " that has "
1056 << ld->messageQueue.size() << " waiting messages" );
1057 ld->flushQueue();
1058 }
1059
1060 // erase mapping
1061 eraseDescriptor(ld->overlayId);
1062}
1063
1064void BaseOverlay::onLinkChanged(const LinkID& id,
1065 const address_v* oldlocal, const address_v* newlocal,
1066 const address_v* oldremote, const address_v* newremote) {
1067
1068 // get descriptor for link
1069 LinkDescriptor* ld = getDescriptor(id, true);
1070 if ( ld == NULL ) return; // not found? ->ignore!
1071 logging_debug( "onLinkChanged descriptor: " << ld );
1072
1073 // inform listeners
1074 ld->listener->onLinkChanged( ld->overlayId, ld->remoteNode );
1075 sideport->onLinkChanged( id, this->nodeId, ld->remoteNode, this->spovnetId );
1076
1077 // autolinks: refresh timestamp
1078 ld->setAutoUsed();
1079}
1080
1081void BaseOverlay::onLinkFail(const LinkID& id,
1082 const address_v* local, const address_v* remote) {
1083 logging_debug( "Link fail with base communication link id=" << id );
1084
1085 // erase bootstrap links
1086 vector<LinkID>::iterator it = std::find( bootstrapLinks.begin(), bootstrapLinks.end(), id );
1087 if( it != bootstrapLinks.end() ) bootstrapLinks.erase( it );
1088
1089 // get descriptor for link
1090 LinkDescriptor* ld = getDescriptor(id, true);
1091 if ( ld == NULL ) return; // not found? ->ignore!
1092 logging_debug( "Link failed id=" << ld->overlayId.toString() );
1093
1094 // inform listeners
1095 ld->listener->onLinkFail( ld->overlayId, ld->remoteNode );
1096 sideport->onLinkFail( id, this->nodeId, ld->remoteNode, this->spovnetId );
1097}
1098
1099void BaseOverlay::onLinkQoSChanged(const LinkID& id, const address_v* local,
1100 const address_v* remote, const QoSParameterSet& qos) {
1101 logging_debug( "Link quality changed with base communication link id=" << id );
1102
1103 // get descriptor for link
1104 LinkDescriptor* ld = getDescriptor(id, true);
1105 if ( ld == NULL ) return; // not found? ->ignore!
1106 logging_debug( "Link quality changed id=" << ld->overlayId.toString() );
1107}
1108
1109bool BaseOverlay::onLinkRequest( const LinkID& id, const address_v* local,
1110 const address_v* remote ) {
1111 logging_debug("Accepting link request from " << remote->to_string() );
1112 return true;
1113}
1114
1115/// handles a message from base communication
1116bool BaseOverlay::receiveMessage(const Message* message,
1117 const LinkID& link, const NodeID& ) {
1118 // get descriptor for link
1119 LinkDescriptor* ld = getDescriptor( link, true );
1120 return handleMessage( message, ld, link );
1121}
1122
1123// ----------------------------------------------------------------------------
1124
1125/// Handle spovnet instance join requests
1126bool BaseOverlay::handleJoinRequest( OverlayMsg* overlayMsg, const LinkID& bcLink ) {
1127
1128 // decapsulate message
1129 JoinRequest* joinReq = overlayMsg->decapsulate<JoinRequest>();
1130 logging_info( "Received join request for spovnet " <<
1131 joinReq->getSpoVNetID().toString() );
1132
1133 // check spovnet id
1134 if( joinReq->getSpoVNetID() != spovnetId ) {
1135 logging_error(
1136 "Received join request for spovnet we don't handle " <<
1137 joinReq->getSpoVNetID().toString() );
1138 return false;
1139 }
1140
1141 // TODO: here you can implement mechanisms to deny joining of a node
1142 bool allow = true;
1143 logging_info( "Sending join reply for spovnet " <<
1144 spovnetId.toString() << " to node " <<
1145 overlayMsg->getSourceNode().toString() <<
1146 ". Result: " << (allow ? "allowed" : "denied") );
1147 joiningNodes.push_back( overlayMsg->getSourceNode() );
1148
1149 // return overlay parameters
1150 assert( overlayInterface != NULL );
1151 logging_debug( "Using bootstrap end-point "
1152 << getEndpointDescriptor().toString() )
1153 OverlayParameterSet parameters = overlayInterface->getParameters();
1154 OverlayMsg retmsg( OverlayMsg::typeJoinReply,
1155 OverlayInterface::OVERLAY_SERVICE_ID, nodeId );
1156 JoinReply replyMsg( spovnetId, parameters,
1157 allow, getEndpointDescriptor() );
1158 retmsg.encapsulate(&replyMsg);
1159 bc->sendMessage( bcLink, &retmsg );
1160
1161 return true;
1162}
1163
1164/// Handle replies to spovnet instance join requests
1165bool BaseOverlay::handleJoinReply( OverlayMsg* overlayMsg, const LinkID& bcLink ) {
1166 // decapsulate message
1167 logging_debug("received join reply message");
1168 JoinReply* replyMsg = overlayMsg->decapsulate<JoinReply>();
1169
1170 // correct spovnet?
1171 if( replyMsg->getSpoVNetID() != spovnetId ) { // no-> fail
1172 logging_error( "Received SpoVNet join reply for " <<
1173 replyMsg->getSpoVNetID().toString() <<
1174 " != " << spovnetId.toString() );
1175 delete replyMsg;
1176 return false;
1177 }
1178
1179 // access granted? no -> fail
1180 if( !replyMsg->getJoinAllowed() ) {
1181 logging_error( "Our join request has been denied" );
1182
1183 // drop initiator link
1184 if( !bcLink.isUnspecified() ){
1185 bc->dropLink( bcLink );
1186
1187 vector<LinkID>::iterator it = std::find(
1188 bootstrapLinks.begin(), bootstrapLinks.end(), bcLink);
1189 if( it != bootstrapLinks.end() )
1190 bootstrapLinks.erase(it);
1191 }
1192
1193 // inform all registered services of the event
1194 BOOST_FOREACH( NodeListener* i, nodeListeners )
1195 i->onJoinFailed( spovnetId );
1196
1197 delete replyMsg;
1198 return true;
1199 }
1200
1201 // access has been granted -> continue!
1202 logging_info("Join request has been accepted for spovnet " <<
1203 spovnetId.toString() );
1204
1205 logging_debug( "Using bootstrap end-point "
1206 << replyMsg->getBootstrapEndpoint().toString() );
1207
1208 // create overlay structure from spovnet parameter set
1209 // if we have not boostrapped yet against some other node
1210 if( overlayInterface == NULL ){
1211
1212 logging_debug("first-time bootstrapping");
1213
1214 overlayInterface = OverlayFactory::create(
1215 *this, replyMsg->getParam(), nodeId, this );
1216
1217 // overlay structure supported? no-> fail!
1218 if( overlayInterface == NULL ) {
1219 logging_error( "overlay structure not supported" );
1220
1221 if( !bcLink.isUnspecified() ){
1222 bc->dropLink( bcLink );
1223
1224 vector<LinkID>::iterator it = std::find(
1225 bootstrapLinks.begin(), bootstrapLinks.end(), bcLink);
1226 if( it != bootstrapLinks.end() )
1227 bootstrapLinks.erase(it);
1228 }
1229
1230 // inform all registered services of the event
1231 BOOST_FOREACH( NodeListener* i, nodeListeners )
1232 i->onJoinFailed( spovnetId );
1233
1234 delete replyMsg;
1235 return true;
1236 }
1237
1238 // everything ok-> join the overlay!
1239 state = BaseOverlayStateCompleted;
1240 overlayInterface->createOverlay();
1241
1242 overlayInterface->joinOverlay( replyMsg->getBootstrapEndpoint() );
1243 overlayBootstrap.recordJoin( replyMsg->getBootstrapEndpoint() );
1244
1245 // update ovlvis
1246 //ovl.visChangeNodeColor( ovlId, nodeId, OvlVis::NODE_COLORS_GREEN);
1247
1248 // inform all registered services of the event
1249 BOOST_FOREACH( NodeListener* i, nodeListeners )
1250 i->onJoinCompleted( spovnetId );
1251
1252 delete replyMsg;
1253
1254 } else {
1255
1256 // this is not the first bootstrap, just join the additional node
1257 logging_debug("not first-time bootstrapping");
1258 overlayInterface->joinOverlay( replyMsg->getBootstrapEndpoint() );
1259 overlayBootstrap.recordJoin( replyMsg->getBootstrapEndpoint() );
1260
1261 delete replyMsg;
1262
1263 } // if( overlayInterface == NULL )
1264
1265 return true;
1266}
1267
1268
1269bool BaseOverlay::handleData( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1270 // get service
1271 const ServiceID& service = overlayMsg->getService();
1272 logging_debug( "Received data for service " << service.toString()
1273 << " on link " << overlayMsg->getDestinationLink().toString() );
1274
1275 // delegate data message
1276 getListener(service)->onMessage(
1277 overlayMsg,
1278 overlayMsg->getSourceNode(),
1279 overlayMsg->getDestinationLink()
1280 );
1281
1282 return true;
1283}
1284
1285
1286bool BaseOverlay::handleLinkUpdate( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1287
1288 if( ld == NULL ) {
1289 logging_warn( "received overlay update message for link for "
1290 << "which we have no mapping" );
1291 return false;
1292 }
1293 logging_info("Received type update message on link " << ld );
1294
1295 // update our link mapping information for this link
1296 bool changed =
1297 ( ld->remoteNode != overlayMsg->getSourceNode() )
1298 || ( ld->service != overlayMsg->getService() );
1299
1300 // set parameters
1301 ld->up = true;
1302 ld->remoteNode = overlayMsg->getSourceNode();
1303 ld->remoteLink = overlayMsg->getSourceLink();
1304 ld->service = overlayMsg->getService();
1305 ld->autolink = overlayMsg->isAutoLink();
1306
1307 // if our link information changed, we send out an update, too
1308 if( changed ) {
1309 overlayMsg->swapRoles();
1310 overlayMsg->setSourceNode(nodeId);
1311 overlayMsg->setSourceLink(ld->overlayId);
1312 overlayMsg->setService(ld->service);
1313 send( overlayMsg, ld );
1314 }
1315
1316 // service registered? no-> error!
1317 if( !communicationListeners.contains( ld->service ) ) {
1318 logging_warn( "Link up: event listener has not been registered" );
1319 return false;
1320 }
1321
1322 // default or no service registered?
1323 CommunicationListener* listener = communicationListeners.get( ld->service );
1324 if( listener == NULL || listener == &CommunicationListener::DEFAULT ) {
1325 logging_warn("Link up: event listener is default or null!" );
1326 return true;
1327 }
1328
1329 // update descriptor
1330 ld->listener = listener;
1331 ld->setAutoUsed();
1332 ld->setAlive();
1333
1334 // ask the service whether it wants to accept this link
1335 if( !listener->onLinkRequest(ld->remoteNode) ) {
1336
1337 logging_debug("Link id=" << ld->overlayId.toString() <<
1338 " has been denied by service " << ld->service.toString() << ", dropping link");
1339
1340 // prevent onLinkDown calls to the service
1341 ld->listener = &CommunicationListener::DEFAULT;
1342
1343 // drop the link
1344 dropLink( ld->overlayId );
1345 return true;
1346 }
1347
1348 // set link up
1349 ld->up = true;
1350 logging_info( "Link has been accepted by service and is up: " << ld );
1351
1352 // auto links: link has been accepted -> send queued messages
1353 if( ld->messageQueue.size() > 0 ) {
1354 logging_info( "Sending out queued messages on link " << ld );
1355 BOOST_FOREACH( Message* msg, ld->messageQueue ) {
1356 sendMessage( msg, ld->overlayId );
1357 delete msg;
1358 }
1359 ld->messageQueue.clear();
1360 }
1361
1362 // call the notification functions
1363 listener->onLinkUp( ld->overlayId, ld->remoteNode );
1364 sideport->onLinkUp( ld->overlayId, nodeId, ld->remoteNode, this->spovnetId );
1365
1366 return true;
1367}
1368
1369/// handle a link request and reply
1370bool BaseOverlay::handleLinkRequest( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1371 logging_info( "Link request received from node id=" << overlayMsg->getSourceNode() );
1372
1373 //TODO: Check if a request has already been sent using getSourceLink() ...
1374
1375 // create link descriptor
1376 LinkDescriptor* ldn = addDescriptor();
1377
1378 // flags
1379 ldn->up = true;
1380 ldn->fromRemote = true;
1381 ldn->relayed = true;
1382
1383 // parameters
1384 ldn->service = overlayMsg->getService();
1385 ldn->listener = getListener(ldn->service);
1386 ldn->remoteNode = overlayMsg->getSourceNode();
1387 ldn->remoteLink = overlayMsg->getSourceLink();
1388
1389 // update time-stamps
1390 ldn->setAlive();
1391 ldn->setAutoUsed();
1392
1393 // create reply message and send back!
1394 overlayMsg->swapRoles(); // swap source/destination
1395 overlayMsg->setType(OverlayMsg::typeLinkReply);
1396 overlayMsg->setSourceLink(ldn->overlayId);
1397 overlayMsg->setSourceEndpoint( bc->getEndpointDescriptor() );
1398 overlayMsg->setRelayed(true);
1399 send( overlayMsg, ld ); // send back to link
1400
1401 // inform listener
1402 ldn->listener->onLinkUp( ldn->overlayId, ldn->remoteNode );
1403
1404 return true;
1405}
1406
1407bool BaseOverlay::handleLinkReply( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1408
1409 // find link request
1410 LinkDescriptor* ldn = getDescriptor(overlayMsg->getDestinationLink());
1411
1412 // not found? yes-> drop with error!
1413 if (ldn == NULL) {
1414 logging_error( "No link request pending for "
1415 << overlayMsg->getDestinationLink().toString() );
1416 return false;
1417 }
1418 logging_debug("Handling link reply for " << ldn )
1419
1420 // check if already up
1421 if (ldn->up) {
1422 logging_warn( "Link already up: " << ldn );
1423 return true;
1424 }
1425
1426 // debug message
1427 logging_debug( "Link request reply received. Establishing link"
1428 << " for service " << overlayMsg->getService().toString()
1429 << " with local id=" << overlayMsg->getDestinationLink()
1430 << " and remote link id=" << overlayMsg->getSourceLink()
1431 << " to " << overlayMsg->getSourceEndpoint().toString()
1432 );
1433
1434 // set local link descriptor data
1435 ldn->up = true;
1436 ldn->relayed = true;
1437 ldn->service = overlayMsg->getService();
1438 ldn->listener = getListener(ldn->service);
1439 ldn->remoteLink = overlayMsg->getSourceLink();
1440 ldn->remoteNode = overlayMsg->getSourceNode();
1441
1442 // update timestamps
1443 ldn->setAlive();
1444 ldn->setAutoUsed();
1445
1446 // auto links: link has been accepted -> send queued messages
1447 if( ldn->messageQueue.size() > 0 ) {
1448 logging_info( "Sending out queued messages on link " <<
1449 ldn->overlayId.toString() );
1450 BOOST_FOREACH( Message* msg, ldn->messageQueue ) {
1451 sendMessage( msg, ldn->overlayId );
1452 delete msg;
1453 }
1454 ldn->messageQueue.clear();
1455 }
1456
1457 // inform listeners about new link
1458 ldn->listener->onLinkUp( ldn->overlayId, ldn->remoteNode );
1459
1460 // try to replace relay link with direct link
1461 ldn->communicationId =
1462 bc->establishLink( overlayMsg->getSourceEndpoint() );
1463
1464 return true;
1465}
1466
1467/// handle a keep-alive message for a link
1468bool BaseOverlay::handleLinkAlive( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1469 LinkDescriptor* rld = getDescriptor(overlayMsg->getDestinationLink());
1470 if ( rld != NULL ) {
1471 logging_debug("Keep-Alive for " <<
1472 overlayMsg->getDestinationLink() );
1473 if (overlayMsg->isRouteRecord())
1474 rld->routeRecord = overlayMsg->getRouteRecord();
1475 rld->setAlive();
1476 return true;
1477 } else {
1478 logging_error("Keep-Alive for "
1479 << overlayMsg->getDestinationLink() << ": link unknown." );
1480 return false;
1481 }
1482}
1483
1484/// handle a direct link message
1485bool BaseOverlay::handleLinkDirect( OverlayMsg* overlayMsg, LinkDescriptor* ld ) {
1486 logging_debug( "Received direct link replacement request" );
1487
1488 /// get destination overlay link
1489 LinkDescriptor* rld = getDescriptor( overlayMsg->getDestinationLink() );
1490 if (rld == NULL || ld == NULL) {
1491 logging_error("Direct link replacement: Link "
1492 << overlayMsg->getDestinationLink() << "not found error." );
1493 return false;
1494 }
1495 logging_info( "Received direct link convert notification for " << rld );
1496
1497 // update information
1498 rld->communicationId = ld->communicationId;
1499 rld->communicationUp = true;
1500 rld->relayed = false;
1501
1502 // mark used and alive!
1503 rld->setAlive();
1504 rld->setAutoUsed();
1505
1506 // erase the original descriptor
1507 eraseDescriptor(ld->overlayId);
1508}
1509
1510/// handles an incoming message
1511bool BaseOverlay::handleMessage( const Message* message, LinkDescriptor* ld,
1512 const LinkID bcLink ) {
1513 logging_debug( "Handling message: " << message->toString());
1514
1515 // decapsulate overlay message
1516 OverlayMsg* overlayMsg =
1517 const_cast<Message*>(message)->decapsulate<OverlayMsg>();
1518 if( overlayMsg == NULL ) return false;
1519
1520 // increase number of hops
1521 overlayMsg->increaseNumHops();
1522
1523 // refresh relay information
1524 refreshRelayInformation( overlayMsg, ld );
1525
1526 // update route record
1527 overlayMsg->addRouteRecord(nodeId);
1528
1529 // handle signaling messages (do not route!)
1530 if (overlayMsg->getType()>=OverlayMsg::typeSignalingStart &&
1531 overlayMsg->getType()<=OverlayMsg::typeSignalingEnd ) {
1532 overlayInterface->onMessage(overlayMsg, NodeID::UNSPECIFIED, LinkID::UNSPECIFIED);
1533 delete overlayMsg;
1534 return true;
1535 }
1536
1537 // message for reached destination? no-> route message
1538 if (!overlayMsg->getDestinationNode().isUnspecified() &&
1539 overlayMsg->getDestinationNode() != nodeId ) {
1540 logging_debug("Routing message "
1541 << " from " << overlayMsg->getSourceNode()
1542 << " to " << overlayMsg->getDestinationNode()
1543 );
1544 route( overlayMsg );
1545 delete overlayMsg;
1546 return true;
1547 }
1548
1549 // handle base overlay message
1550 bool ret = false; // return value
1551 switch ( overlayMsg->getType() ) {
1552
1553 // data transport messages
1554 case OverlayMsg::typeData:
1555 ret = handleData(overlayMsg, ld); break;
1556
1557 // overlay setup messages
1558 case OverlayMsg::typeJoinRequest:
1559 ret = handleJoinRequest(overlayMsg, bcLink ); break;
1560 case OverlayMsg::typeJoinReply:
1561 ret = handleJoinReply(overlayMsg, bcLink ); break;
1562
1563 // link specific messages
1564 case OverlayMsg::typeLinkRequest:
1565 ret = handleLinkRequest(overlayMsg, ld ); break;
1566 case OverlayMsg::typeLinkReply:
1567 ret = handleLinkReply(overlayMsg, ld ); break;
1568 case OverlayMsg::typeLinkUpdate:
1569 ret = handleLinkUpdate(overlayMsg, ld ); break;
1570 case OverlayMsg::typeLinkAlive:
1571 ret = handleLinkAlive(overlayMsg, ld ); break;
1572 case OverlayMsg::typeLinkDirect:
1573 ret = handleLinkDirect(overlayMsg, ld ); break;
1574
1575 // handle unknown message type
1576 default: {
1577 logging_error( "received message in invalid state! don't know " <<
1578 "what to do with this message of type " << overlayMsg->getType() );
1579 ret = false;
1580 break;
1581 }
1582 }
1583
1584 // free overlay message and return value
1585 delete overlayMsg;
1586 return ret;
1587}
1588
1589// ----------------------------------------------------------------------------
1590
1591void BaseOverlay::broadcastMessage(Message* message, const ServiceID& service) {
1592
1593 logging_debug( "broadcasting message to all known nodes " <<
1594 "in the overlay from service " + service.toString() );
1595
1596 OverlayInterface::NodeList nodes = overlayInterface->getKnownNodes(true);
1597 OverlayInterface::NodeList::iterator i = nodes.begin();
1598 for(; i != nodes.end(); i++ ) {
1599 if( *i == nodeId) continue; // don't send to ourselfs
1600 sendMessage( message, *i, service );
1601 }
1602}
1603
1604/// return the overlay neighbors
1605vector<NodeID> BaseOverlay::getOverlayNeighbors(bool deep) const {
1606 // the known nodes _can_ also include our node, so we remove ourself
1607 vector<NodeID> nodes = overlayInterface->getKnownNodes(deep);
1608 vector<NodeID>::iterator i = find( nodes.begin(), nodes.end(), this->nodeId );
1609 if( i != nodes.end() ) nodes.erase( i );
1610 return nodes;
1611}
1612
1613const NodeID& BaseOverlay::getNodeID(const LinkID& lid) const {
1614 if( lid == LinkID::UNSPECIFIED ) return nodeId;
1615 const LinkDescriptor* ld = getDescriptor(lid);
1616 if( ld == NULL ) return NodeID::UNSPECIFIED;
1617 else return ld->remoteNode;
1618}
1619
1620vector<LinkID> BaseOverlay::getLinkIDs( const NodeID& nid ) const {
1621 vector<LinkID> linkvector;
1622 BOOST_FOREACH( LinkDescriptor* ld, links ) {
1623 if( ld->remoteNode == nid || nid == NodeID::UNSPECIFIED ) {
1624 linkvector.push_back( ld->overlayId );
1625 }
1626 }
1627 return linkvector;
1628}
1629
1630
1631void BaseOverlay::onNodeJoin(const NodeID& node) {
1632 JoiningNodes::iterator i = std::find( joiningNodes.begin(), joiningNodes.end(), node );
1633 if( i == joiningNodes.end() ) return;
1634
1635 logging_info( "node has successfully joined baseoverlay and overlay structure "
1636 << node.toString() );
1637
1638 joiningNodes.erase( i );
1639}
1640
1641void BaseOverlay::eventFunction() {
1642 stabilizeRelays();
1643 stabilizeLinks();
1644}
1645
1646}} // namespace ariba, overlay
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