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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
#include "Swiften/Network/Connector.h"
#include <boost/bind.hpp>
#include <iostream>
#include "Swiften/Network/ConnectionFactory.h"
#include "Swiften/Network/DomainNameResolver.h"
#include "Swiften/Network/DomainNameAddressQuery.h"
#include "Swiften/Network/TimerFactory.h"
namespace Swift {
Connector::Connector(const String& hostname, DomainNameResolver* resolver, ConnectionFactory* connectionFactory, TimerFactory* timerFactory) : hostname(hostname), resolver(resolver), connectionFactory(connectionFactory), timerFactory(timerFactory), timeoutMilliseconds(0), queriedAllServices(true) {
}
void Connector::setTimeoutMilliseconds(int milliseconds) {
timeoutMilliseconds = milliseconds;
}
void Connector::start() {
//std::cout << "Connector::start()" << std::endl;
assert(!currentConnection);
assert(!serviceQuery);
assert(!timer);
queriedAllServices = false;
serviceQuery = resolver->createServiceQuery("_xmpp-client._tcp." + hostname);
serviceQuery->onResult.connect(boost::bind(&Connector::handleServiceQueryResult, shared_from_this(), _1));
if (timeoutMilliseconds > 0) {
timer = timerFactory->createTimer(timeoutMilliseconds);
timer->onTick.connect(boost::bind(&Connector::handleTimeout, shared_from_this()));
timer->start();
}
serviceQuery->run();
}
void Connector::stop() {
finish(boost::shared_ptr<Connection>());
}
void Connector::queryAddress(const String& hostname) {
assert(!addressQuery);
addressQuery = resolver->createAddressQuery(hostname);
addressQuery->onResult.connect(boost::bind(&Connector::handleAddressQueryResult, shared_from_this(), _1, _2));
addressQuery->run();
}
void Connector::handleServiceQueryResult(const std::vector<DomainNameServiceQuery::Result>& result) {
//std::cout << "Received SRV results" << std::endl;
serviceQueryResults = std::deque<DomainNameServiceQuery::Result>(result.begin(), result.end());
serviceQuery.reset();
tryNextServiceOrFallback();
}
void Connector::tryNextServiceOrFallback() {
if (queriedAllServices) {
//std::cout << "Connector::tryNextServiceOrCallback(): Queried all hosts. Error." << std::endl;
finish(boost::shared_ptr<Connection>());
}
else if (serviceQueryResults.empty()) {
//std::cout << "Connector::tryNextHostName(): Falling back on A resolution" << std::endl;
// Fall back on simple address resolving
queriedAllServices = true;
queryAddress(hostname);
}
else {
//std::cout << "Connector::tryNextHostName(): Querying next address" << std::endl;
queryAddress(serviceQueryResults.front().hostname);
}
}
void Connector::handleAddressQueryResult(const std::vector<HostAddress>& addresses, boost::optional<DomainNameResolveError> error) {
//std::cout << "Connector::handleAddressQueryResult(): Start" << std::endl;
addressQuery.reset();
if (error || addresses.empty()) {
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
else {
addressQueryResults = std::deque<HostAddress>(addresses.begin(), addresses.end());
tryNextAddress();
}
}
void Connector::tryNextAddress() {
if (addressQueryResults.empty()) {
//std::cout << "Connector::tryNextAddress(): Done trying addresses. Moving on" << std::endl;
// Done trying all addresses. Move on to the next host.
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
else {
//std::cout << "Connector::tryNextAddress(): trying next address." << std::endl;
HostAddress address = addressQueryResults.front();
addressQueryResults.pop_front();
int port = 5222;
if (!serviceQueryResults.empty()) {
port = serviceQueryResults.front().port;
}
tryConnect(HostAddressPort(address, port));
}
}
void Connector::tryConnect(const HostAddressPort& target) {
assert(!currentConnection);
//std::cout << "Connector::tryConnect() " << target.getAddress().toString() << " " << target.getPort() << std::endl;
currentConnection = connectionFactory->createConnection();
currentConnection->onConnectFinished.connect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1));
currentConnection->connect(target);
}
void Connector::handleConnectionConnectFinished(bool error) {
//std::cout << "Connector::handleConnectionConnectFinished() " << error << std::endl;
currentConnection->onConnectFinished.disconnect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1));
if (error) {
currentConnection.reset();
if (!addressQueryResults.empty()) {
tryNextAddress();
}
else {
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
}
else {
finish(currentConnection);
}
}
void Connector::finish(boost::shared_ptr<Connection> connection) {
if (timer) {
timer->stop();
timer->onTick.disconnect(boost::bind(&Connector::handleTimeout, shared_from_this()));
timer.reset();
}
if (serviceQuery) {
serviceQuery->onResult.disconnect(boost::bind(&Connector::handleServiceQueryResult, shared_from_this(), _1));
serviceQuery.reset();
}
if (addressQuery) {
addressQuery->onResult.disconnect(boost::bind(&Connector::handleAddressQueryResult, shared_from_this(), _1, _2));
addressQuery.reset();
}
if (currentConnection) {
currentConnection->onConnectFinished.disconnect(boost::bind(&Connector::handleConnectionConnectFinished, shared_from_this(), _1));
currentConnection.reset();
}
onConnectFinished(connection);
}
void Connector::handleTimeout() {
finish(boost::shared_ptr<Connection>());
}
};
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Swift