+/*

+ * Copyright (c) 2010 Kevin Smith

+ * Licensed under the GNU General Public License v3.

+ * See Documentation/Licenses/GPLv3.txt for more information.

+ */

+

+#include <Swiften/Disco/DiscoServiceWalker.h>

+

+#include <Swiften/Base/Log.h>

+#include <Swiften/Base/foreach.h>

+

+#include <boost/bind.hpp>

+

+namespace Swift {

+

+DiscoServiceWalker::DiscoServiceWalker(const JID& service, IQRouter* iqRouter, size_t maxSteps) : service_(service), iqRouter_(iqRouter), maxSteps_(maxSteps), active_(false) {

+

+}

+

+void DiscoServiceWalker::beginWalk() {

+ SWIFT_LOG(debug) << "Starting walk to " << service_ << std::endl;

+ assert(!active_);

+ assert(servicesBeingSearched_.empty());

+ active_ = true;

+ walkNode(service_);

+}

+

+void DiscoServiceWalker::endWalk() {

+ if (active_) {

+ SWIFT_LOG(debug) << "Ending walk to " << service_ << std::endl;

+ foreach (GetDiscoInfoRequest::ref request, pendingDiscoInfoRequests_) {

+ request->onResponse.disconnect(boost::bind(&DiscoServiceWalker::handleDiscoInfoResponse, this, _1, _2, request));

+ }

+ foreach (GetDiscoItemsRequest::ref request, pendingDiscoItemsRequests_) {

+ request->onResponse.disconnect(boost::bind(&DiscoServiceWalker::handleDiscoItemsResponse, this, _1, _2, request));

+ }

+ active_ = false;

+ }

+}

+

+void DiscoServiceWalker::walkNode(const JID& jid) {

+ SWIFT_LOG(debug) << "Walking node " << jid << std::endl;

+ servicesBeingSearched_.insert(jid);

+ searchedServices_.insert(jid);

+ GetDiscoInfoRequest::ref discoInfoRequest = GetDiscoInfoRequest::create(jid, iqRouter_);

+ discoInfoRequest->onResponse.connect(boost::bind(&DiscoServiceWalker::handleDiscoInfoResponse, this, _1, _2, discoInfoRequest));

+ pendingDiscoInfoRequests_.insert(discoInfoRequest);

+ discoInfoRequest->send();

+}

+

+void DiscoServiceWalker::handleDiscoInfoResponse(boost::shared_ptr<DiscoInfo> info, ErrorPayload::ref error, GetDiscoInfoRequest::ref request) {

+ /* If we got canceled, don't do anything */

+ if (!active_) {

+ return;

+ }

+

+ SWIFT_LOG(debug) << "Disco info response from " << request->getReceiver() << std::endl;

+

+ pendingDiscoInfoRequests_.erase(request);

+ if (error) {

+ handleDiscoError(request->getReceiver(), error);

+ return;

+ }

+

+ bool couldContainServices = false;

+ foreach (DiscoInfo::Identity identity, info->getIdentities()) {

+ if (identity.getCategory() == "server") {

+ couldContainServices = true;

+ }

+ }

+ bool completed = false;

+ if (couldContainServices) {

+ GetDiscoItemsRequest::ref discoItemsRequest = GetDiscoItemsRequest::create(request->getReceiver(), iqRouter_);

+ discoItemsRequest->onResponse.connect(boost::bind(&DiscoServiceWalker::handleDiscoItemsResponse, this, _1, _2, discoItemsRequest));

+ pendingDiscoItemsRequests_.insert(discoItemsRequest);

+ discoItemsRequest->send();

+ } else {

+ completed = true;

+ }

+ onServiceFound(request->getReceiver(), info);

+ if (completed) {

+ markNodeCompleted(request->getReceiver());

+ }

+}

+

+void DiscoServiceWalker::handleDiscoItemsResponse(boost::shared_ptr<DiscoItems> items, ErrorPayload::ref error, GetDiscoItemsRequest::ref request) {

+ /* If we got canceled, don't do anything */

+ if (!active_) {

+ return;

+ }

+

+ SWIFT_LOG(debug) << "Received disco items from " << request->getReceiver() << std::endl;

+ pendingDiscoItemsRequests_.erase(request);

+ if (error) {

+ handleDiscoError(request->getReceiver(), error);

+ return;

+ }

+ foreach (DiscoItems::Item item, items->getItems()) {

+ if (item.getNode().empty()) {

+ /* Don't look at noded items. It's possible that this will exclude some services,

+ * but I've never seen one in the wild, and it's an easy fix for not looping.

+ */

+ if (std::find(searchedServices_.begin(), searchedServices_.end(), item.getJID()) == searchedServices_.end()) { /* Don't recurse infinitely */

+ SWIFT_LOG(debug) << "Received disco item " << item.getJID() << std::endl;

+ walkNode(item.getJID());

+ }

+ }

+ }

+ markNodeCompleted(request->getReceiver());

+}

+

+void DiscoServiceWalker::handleDiscoError(const JID& jid, ErrorPayload::ref /*error*/) {

+ SWIFT_LOG(debug) << "Disco error from " << jid << std::endl;

+ markNodeCompleted(jid);

+}

+

+void DiscoServiceWalker::markNodeCompleted(const JID& jid) {

+ SWIFT_LOG(debug) << "Node completed " << jid << std::endl;

+ servicesBeingSearched_.erase(jid);

+ /* All results are in */

+ if (servicesBeingSearched_.empty()) {

+ active_ = false;

+ onWalkComplete();

+ }

+ /* Check if we're on a rampage */

+ else if (searchedServices_.size() >= maxSteps_) {

+ active_ = false;

+ onWalkComplete();

+ }

+}

+

+}