// realwx_ctrl.cxx -- Process real weather data
//
// Written by David Megginson, started February 2002.
-// Rewritten by Torsten Dreyer, August 2010
+// Rewritten by Torsten Dreyer, August 2010, August 2011
//
// Copyright (C) 2002 David Megginson - david@megginson.com
//
#include <algorithm>
-using simgear::PropertyList;
-
namespace Environment {
+/* -------------------------------------------------------------------------------- */
+
+class FGHTTPClient : public simgear::HTTP::Client {
+public:
+ FGHTTPClient();
+};
+
+FGHTTPClient::FGHTTPClient()
+{
+ string proxyHost(fgGetString("/sim/presets/proxy/host"));
+ int proxyPort(fgGetInt("/sim/presets/proxy/port"));
+ string proxyAuth(fgGetString("/sim/presets/proxy/auth"));
+
+ if (!proxyHost.empty()) {
+ setProxy(proxyHost, proxyPort, proxyAuth);
+ }
+}
/* -------------------------------------------------------------------------------- */
-class LiveMetarProperties : public MetarProperties {
+class MetarDataHandler {
public:
- LiveMetarProperties( SGPropertyNode_ptr rootNode );
+ virtual void handleMetarData( const std::string & data ) = 0;
+};
+
+class MetarRequester {
+public:
+ virtual void requestMetar( MetarDataHandler * metarDataHandler, const std::string & id ) = 0;
+};
+
+/* -------------------------------------------------------------------------------- */
+
+class LiveMetarProperties : public MetarProperties, MetarDataHandler {
+public:
+ LiveMetarProperties( SGPropertyNode_ptr rootNode, MetarRequester * metarRequester );
virtual ~LiveMetarProperties();
virtual void update( double dt );
virtual double getTimeToLive() const { return _timeToLive; }
virtual void setTimeToLive( double value ) { _timeToLive = value; }
+
+ // implementation of MetarDataHandler
+ virtual void handleMetarData( const std::string & data );
+
+ static const unsigned MAX_POLLING_INTERVAL_SECONDS = 10;
+ static const unsigned DEFAULT_TIME_TO_LIVE_SECONDS = 900;
+
private:
double _timeToLive;
-
+ double _pollingTimer;
+ MetarRequester * _metarRequester;
};
typedef SGSharedPtr<LiveMetarProperties> LiveMetarProperties_ptr;
-LiveMetarProperties::LiveMetarProperties( SGPropertyNode_ptr rootNode ) :
+LiveMetarProperties::LiveMetarProperties( SGPropertyNode_ptr rootNode, MetarRequester * metarRequester ) :
MetarProperties( rootNode ),
- _timeToLive(0.0)
+ _timeToLive(0.0),
+ _pollingTimer(0.0),
+ _metarRequester(metarRequester)
{
_tiedProperties.Tie("time-to-live", &_timeToLive );
}
void LiveMetarProperties::update( double dt )
{
_timeToLive -= dt;
- if( _timeToLive < 0.0 ) _timeToLive = 0.0;
+ _pollingTimer -= dt;
+ if( _timeToLive < 0.0 ) {
+ _timeToLive = 0.0;
+ std::string stationId = getStationId();
+ if( stationId.empty() ) return;
+ if( _pollingTimer > 0.0 ) return;
+ _metarRequester->requestMetar( this, stationId );
+ _pollingTimer = MAX_POLLING_INTERVAL_SECONDS;
+ }
+}
+
+void LiveMetarProperties::handleMetarData( const std::string & data )
+{
+ SG_LOG( SG_ENVIRONMENT, SG_INFO, "LiveMetarProperties::handleMetarData() received METAR for " << getStationId() << ": " << data );
+ _timeToLive = DEFAULT_TIME_TO_LIVE_SECONDS;
+ setMetar( data );
}
/* -------------------------------------------------------------------------------- */
class BasicRealWxController : public RealWxController
{
public:
- BasicRealWxController( SGPropertyNode_ptr rootNode );
+ BasicRealWxController( SGPropertyNode_ptr rootNode, MetarRequester * metarRequester );
virtual ~BasicRealWxController ();
virtual void init ();
void unbind();
void update( double dt );
- virtual void update( bool first, double dt ) = 0;
+ virtual void update (bool first, double delta_time_sec);
long getMetarMaxAgeMin() const { return _max_age_n == NULL ? 0 : _max_age_n->getLongValue(); }
SGPropertyNode_ptr _rootNode;
- SGPropertyNode_ptr _longitude_n;
- SGPropertyNode_ptr _latitude_n;
SGPropertyNode_ptr _ground_elevation_n;
SGPropertyNode_ptr _max_age_n;
simgear::TiedPropertyList _tiedProperties;
typedef std::vector<LiveMetarProperties_ptr> MetarPropertiesList;
MetarPropertiesList _metarProperties;
-
+private:
+ double _positionTimeToLive;
};
/* -------------------------------------------------------------------------------- */
~/metar[1..n]: string Target property path for metar data
*/
-BasicRealWxController::BasicRealWxController( SGPropertyNode_ptr rootNode ) :
+BasicRealWxController::BasicRealWxController( SGPropertyNode_ptr rootNode, MetarRequester * metarRequester ) :
_rootNode(rootNode),
- _longitude_n( fgGetNode( "/position/longitude-deg", true )),
- _latitude_n( fgGetNode( "/position/latitude-deg", true )),
_ground_elevation_n( fgGetNode( "/position/ground-elev-m", true )),
_max_age_n( fgGetNode( "/environment/params/metar-max-age-min", false ) ),
_enabled(true),
- __enabled(false)
+ __enabled(false),
+ _positionTimeToLive(0.0)
{
// at least instantiate MetarProperties for /environment/metar
_metarProperties.push_back( new LiveMetarProperties(
- fgGetNode( rootNode->getStringValue("metar", "/environment/metar"), true ) ) );
+ fgGetNode( rootNode->getStringValue("metar", "/environment/metar"), true ), metarRequester ));
- PropertyList metars = rootNode->getChildren("metar");
- for( PropertyList::size_type i = 1; i < metars.size(); i++ ) {
- SG_LOG( SG_ENVIRONMENT, SG_INFO, "Adding metar properties at " << metars[i]->getStringValue() );
+ BOOST_FOREACH( SGPropertyNode_ptr n, rootNode->getChildren("metar") ) {
+ SG_LOG( SG_ENVIRONMENT, SG_INFO, "Adding metar properties at " << n->getStringValue() );
_metarProperties.push_back( new LiveMetarProperties(
- fgGetNode( metars[i]->getStringValue(), true )));
+ fgGetNode( n->getStringValue(), true ), metarRequester ));
}
}
bool firstIteration = !__enabled; // first iteration after being enabled?
// clock tick for every METAR in stock
- for( MetarPropertiesList::iterator it = _metarProperties.begin();
- it != _metarProperties.end(); it++ ) {
+ BOOST_FOREACH(LiveMetarProperties* p, _metarProperties) {
// first round? All received METARs are outdated
- if( firstIteration ) (*it)->setTimeToLive( 0.0 );
- (*it)->update(dt);
+ if( firstIteration ) p->setTimeToLive( 0.0 );
+ p->update(dt);
}
update( firstIteration, dt );
}
}
-/* -------------------------------------------------------------------------------- */
+void BasicRealWxController::update( bool first, double dt )
+{
+ _positionTimeToLive -= dt;
-class NoaaMetarRealWxController : public BasicRealWxController {
-public:
- NoaaMetarRealWxController( SGPropertyNode_ptr rootNode );
- virtual ~NoaaMetarRealWxController();
- virtual void update (bool first, double delta_time_sec);
- virtual void shutdown ();
+ if( _positionTimeToLive <= 0.0 ) {
- /**
- * callback from MetarGetRequest when a download succeeds
- */
- void gotMetar(const string& stationId, const string& metar);
-private:
- double _positionTimeToLive;
- double _requestTimer;
- simgear::HTTP::Client _http;
-};
+ try {
+ const SGGeod & pos = globals->get_aircraft_position();
-class MetarGetRequest : public simgear::HTTP::Request
-{
-public:
- MetarGetRequest(NoaaMetarRealWxController* con, const string& s) :
- Request(""),
- stationId(s),
- fromProxy(false),
- wxController(con)
- {
- setUrl("http://weather.noaa.gov/pub/data/observations/metar/stations/" + stationId + ".TXT");
- }
-
- virtual string_list requestHeaders() const
- {
- string_list r;
- r.push_back("X-Time");
- return r;
- }
-
- virtual string header(const string& name) const
- {
- if (name == "X-Time") {
- char buf[16];
- snprintf(buf, 16, "%ld", globals->get_time_params()->get_cur_time());
- return buf;
- }
-
- return Request::header(name);
- }
-
- virtual void responseHeader(const string& key, const string& value)
- {
- if (key == "x-metarproxy") {
- fromProxy = true;
+ // check nearest airport
+ SG_LOG(SG_ENVIRONMENT, SG_INFO, "NoaaMetarRealWxController::update(): (re) checking nearby airport with METAR" );
+ _positionTimeToLive = 60.0;
+
+ FGAirport * nearestAirport = FGAirport::findClosest(pos, 10000.0, MetarAirportFilter::instance() );
+ if( nearestAirport == NULL ) {
+ SG_LOG(SG_ENVIRONMENT,SG_WARN,"RealWxController::update can't find airport with METAR within 10000NM" );
+ return;
+ }
+
+ SG_LOG(SG_ENVIRONMENT, SG_INFO,
+ "NoaaMetarRealWxController::update(): nearest airport with METAR is: " << nearestAirport->ident() );
+
+ // if it has changed, invalidate the associated METAR
+ if( _metarProperties[0]->getStationId() != nearestAirport->ident() ) {
+ SG_LOG(SG_ENVIRONMENT, SG_INFO,
+ "NoaaMetarRealWxController::update(): nearest airport with METAR has changed. Old: '" <<
+ _metarProperties[0]->getStationId() <<
+ "', new: '" << nearestAirport->ident() << "'" );
+ _metarProperties[0]->setStationId( nearestAirport->ident() );
+ _metarProperties[0]->setTimeToLive( 0.0 );
+ }
}
- }
-
- virtual void gotBodyData(const char* s, int n)
- {
- metar += string(s, n);
- }
-
- virtual void responseComplete()
- {
- if (responseCode() == 200) {
- wxController->gotMetar(stationId, metar);
- } else {
- SG_LOG(SG_ENVIRONMENT, SG_WARN, "metar download failed:" << url() << ": reason:" << responseReason());
+ catch( sg_exception & ) {
+ return;
}
}
-
- bool fromMetarProxy() const
- { return fromProxy; }
-private:
- string stationId;
- string metar;
- bool fromProxy;
- NoaaMetarRealWxController* wxController;
-};
+}
+/* -------------------------------------------------------------------------------- */
+class NoaaMetarRealWxController : public BasicRealWxController, MetarRequester {
+public:
+ NoaaMetarRealWxController( SGPropertyNode_ptr rootNode );
+ virtual ~NoaaMetarRealWxController();
+ virtual void update( double dt );
-NoaaMetarRealWxController::NoaaMetarRealWxController( SGPropertyNode_ptr rootNode ) :
- BasicRealWxController(rootNode),
- _positionTimeToLive(0.0),
- _requestTimer(0.0)
-{
- string proxyHost(fgGetString("/sim/presets/proxy/host"));
- int proxyPort(fgGetInt("/sim/presets/proxy/port"));
- string proxyAuth(fgGetString("/sim/presets/proxy/auth"));
-
- if (!proxyHost.empty()) {
- _http.setProxy(proxyHost, proxyPort, proxyAuth);
- }
-}
+ // implementation of MetarRequester
+ virtual void requestMetar( MetarDataHandler * metarDataHandler, const std::string & id );
+
+private:
+ FGHTTPClient _http;
+};
-void NoaaMetarRealWxController::shutdown()
+NoaaMetarRealWxController::NoaaMetarRealWxController( SGPropertyNode_ptr rootNode ) :
+ BasicRealWxController(rootNode, this )
{
}
{
}
-void NoaaMetarRealWxController::update( bool first, double dt )
+void NoaaMetarRealWxController::update( double dt )
{
_http.update();
-
- _positionTimeToLive -= dt;
- _requestTimer -= dt;
-
- if( _positionTimeToLive <= 0.0 ) {
- // check nearest airport
- SG_LOG(SG_ENVIRONMENT, SG_INFO, "NoaaMetarRealWxController::update(): (re) checking nearby airport with METAR" );
- _positionTimeToLive = 60.0;
-
- SGGeod pos = SGGeod::fromDeg(_longitude_n->getDoubleValue(), _latitude_n->getDoubleValue());
-
- FGAirport * nearestAirport = FGAirport::findClosest(pos, 10000.0, MetarAirportFilter::instance() );
- if( nearestAirport == NULL ) {
- SG_LOG(SG_ENVIRONMENT,SG_WARN,"RealWxController::update can't find airport with METAR within 10000NM" );
- return;
- }
-
- SG_LOG(SG_ENVIRONMENT, SG_INFO,
- "NoaaMetarRealWxController::update(): nearest airport with METAR is: " << nearestAirport->ident() );
-
- // if it has changed, invalidate the associated METAR
- if( _metarProperties[0]->getStationId() != nearestAirport->ident() ) {
- SG_LOG(SG_ENVIRONMENT, SG_INFO,
- "NoaaMetarRealWxController::update(): nearest airport with METAR has changed. Old: '" <<
- _metarProperties[0]->getStationId() <<
- "', new: '" << nearestAirport->ident() << "'" );
- _metarProperties[0]->setStationId( nearestAirport->ident() );
- _metarProperties[0]->setTimeToLive( 0.0 );
- }
- }
-
- if( _requestTimer <= 0.0 ) {
- _requestTimer = 10.0;
-
- BOOST_FOREACH(LiveMetarProperties* p, _metarProperties) {
- if( p->getTimeToLive() > 0.0 ) continue;
- const std::string & stationId = p->getStationId();
- if( stationId.empty() ) continue;
-
- SG_LOG(SG_ENVIRONMENT, SG_INFO,
- "NoaaMetarRealWxController::update(): spawning load request for station-id '" << stationId << "'" );
-
- _http.makeRequest(new MetarGetRequest(this, stationId));
- } // of MetarProperties iteration
- }
+ BasicRealWxController::update( dt );
}
-void NoaaMetarRealWxController::gotMetar(const string& stationId, const string& metar)
+void NoaaMetarRealWxController::requestMetar( MetarDataHandler * metarDataHandler, const std::string & id )
{
- SG_LOG( SG_ENVIRONMENT, SG_INFO, "NoaaMetarRwalWxController::update() received METAR for " << stationId << ": " << metar );
- BOOST_FOREACH(LiveMetarProperties* p, _metarProperties) {
- if (p->getStationId() != stationId)
- continue;
-
- p->setTimeToLive(900);
- p->setMetar( metar );
- }
+ class NoaaMetarGetRequest : public simgear::HTTP::Request
+ {
+ public:
+ NoaaMetarGetRequest(MetarDataHandler* metarDataHandler, const string& stationId ) :
+ Request("http://weather.noaa.gov/pub/data/observations/metar/stations/" + stationId + ".TXT"),
+ _fromProxy(false),
+ _metarDataHandler(metarDataHandler)
+ {
+ }
+
+ virtual string_list requestHeaders() const
+ {
+ string_list reply;
+ reply.push_back("X-TIME");
+ return reply;
+ }
+
+ virtual std::string header(const std::string& name) const
+ {
+ string reply;
+
+ if( name == "X-TIME" ) {
+ ostringstream buf;
+ buf << globals->get_time_params()->get_cur_time();
+ reply = buf.str();
+ }
+
+ return reply;
+ }
+
+ virtual void responseHeader(const string& key, const string& value)
+ {
+ if (key == "x-metarproxy") {
+ _fromProxy = true;
+ }
+ }
+
+ virtual void gotBodyData(const char* s, int n)
+ {
+ _metar += string(s, n);
+ }
+
+ virtual void responseComplete()
+ {
+ if (responseCode() == 200) {
+ _metarDataHandler->handleMetarData( _metar);
+ } else {
+ SG_LOG(SG_ENVIRONMENT, SG_WARN, "metar download failed:" << url() << ": reason:" << responseReason());
+ }
+ }
+
+ bool fromMetarProxy() const
+ { return _fromProxy; }
+ private:
+ string _metar;
+ bool _fromProxy;
+ MetarDataHandler * _metarDataHandler;
+ };
+
+
+ SG_LOG(SG_ENVIRONMENT, SG_INFO,
+ "NoaaMetarRealWxController::update(): spawning load request for station-id '" << id << "'" );
+ _http.makeRequest(new NoaaMetarGetRequest(metarDataHandler, id));
}
/* -------------------------------------------------------------------------------- */
projects / flightgear.git / commitdiff