path: root/apps/samples/vrml/vrml-server.scxml

<scxml datamodel="ecmascript" name="vrml">
	<script src="http://uscxml.tk.informatik.tu-darmstadt.de/scripts/dump.js" />
	<script src="http://uscxml.tk.informatik.tu-darmstadt.de/scripts/string.endsWith.js" />
	<script src="http://uscxml.tk.informatik.tu-darmstadt.de/scripts/array.last.js" />
	<script>
		var wrls = {};        // information of the wrl, vrml files
		var models = {};      // information of the osgb files
		
		var pathDelim = ':';  // we need to flatten directories - this will seperate them in filenames
		
		/**
		 * Transform a http request into a pose
		 */
		function reqToStruct(req) {
			var struct = {};
			
			var query = (('query' in req) ? req.query : {});
			
			struct.pitch =    (('pitch'  in query &amp;&amp; isNumber(query.pitch))  ? query.pitch  : 0);
			struct.roll =     (('roll'   in query &amp;&amp; isNumber(query.roll))   ? query.roll   : 0);
			struct.yaw =      (('yaw'    in query &amp;&amp; isNumber(query.yaw))    ? query.yaw    : 0);
			struct.zoom =     (('zoom'   in query &amp;&amp; isNumber(query.zoom))   ? query.zoom   : 1);
			struct.x =        (('x'      in query &amp;&amp; isNumber(query.x))      ? query.x      : 0);
			struct.y =        (('y'      in query &amp;&amp; isNumber(query.y))      ? query.y      : 0);
			struct.z =        (('z'      in query &amp;&amp; isNumber(query.z))      ? query.z      : 0);
			struct.width =    (('width'  in query &amp;&amp; isNumber(query.width))  ? query.width  : 640);
			struct.height =   (('height' in query &amp;&amp; isNumber(query.height)) ? query.height : 480);
			struct.autorotate = (('autorotate' in query &amp;&amp; (query.autorotate === 'on' || query.autorotate === 'off')) ? query.autorotate : 'on');

			var fileComp = req.pathComponent[req.pathComponent.length - 1];
			struct.file = fileComp.substr(0, fileComp.indexOf('.'));
			struct.ext = fileComp.substr(fileComp.indexOf('.') + 1);

			struct.key = _event.data.pathComponent.slice(1, _event.data.pathComponent.length - 1).join(pathDelim);
			if (struct.key.length > 0)
				struct.key += pathDelim;
			struct.key += struct.file;
			
			return struct;
		}

		function keyForFile(file) {
			var key = file.relDir.replace(/\//g, pathDelim).substr(1) + file.strippedName;
			return key;
		}
		
		function isSupportedFormat(extension) {
			if (extension === "gif")
				return true;
			if (extension === "jpg")
				return true;
			if (extension === "jpeg")
				return true;
			if (extension === "png")
				return true;
			if (extension === "tif")
				return true;
			if (extension === "tiff")
				return true;
			if (extension === "bmp")
				return true;
			return false;
		}

		// list all available models in a summary format for the topmost request
		function overviewList() {
			var struct = {};
			struct.models = {};
			for (key in models) {
				var model = models[key];
				var group = models[key].group
				var name = model.strippedName.split(pathDelim).last();
				var entry = assign(struct, ['models'].concat(group.substr(1).split('/')).concat(name), {});
				entry.url = 
					_ioprocessors['http'].location + model.relDir + model.strippedName.split(pathDelim).join('/') + '.png';
				entry.path = model.relDir + model.strippedName.split(pathDelim).join('/') + '.png';
			}
			return struct;
		}

		// check whether a given string represents a number	
		function isNumber(n) {
		  return !isNaN(parseFloat(n)) &amp;&amp; isFinite(n);
		}
		
		// allow to set deep keys in an object
		function assign(obj, path, value) {
			if (typeof path === 'string')
				path = path.split('.');
			if (!(path instanceof Array))
				return undefined;
				
			lastKeyIndex = path.length-1;
			for (var i = 0; i &lt; lastKeyIndex; ++ i) {
				key = path[i];
				if (key.length == 0)
				  continue;
				if (!(key in obj))
					obj[key] = {}
				obj = obj[key];
			}
			obj[path[lastKeyIndex]] = value;
			return obj[path[lastKeyIndex]];
		}
	</script>
	<state id="main">
		<!-- Stop processing if no vrml-path was given on command line -->
		<transition target="final" cond="_x['args']['vrml-path'] == undefined || _x['args']['vrml-path'].length == 0">
			<log expr="'No --vrml-path given'" />
		</transition>

		<!-- Stop processing if no tmp-path was given on command line -->
		<transition target="final" cond="_x['args']['tmp-path'] == undefined || _x['args']['tmp-path'].length == 0">
			<log expr="'No --tmp-path given'" />
		</transition>
				
		<!-- Stop processing if any error occurs -->
		<transition target="final" event="error">
			<log expr="'An error occured:'" />
			<script>dump(_event);</script>
		</transition>
						
		<!-- Start the directory monitor for generated files -->
		<invoke type="dirmon" id="dirmon.processed">
			<param name="dir" expr="_x['args']['tmp-path']" />
			<param name="recurse" expr="false" />
			<param name="reportExisting" expr="true" />
			<param name="suffix" expr="'osgb'" />
			<!-- Called for every file we found -->
			<finalize>
				<script>
					
					var key = keyForFile(_event.data.file);
					// this is a binary 3D file converted from the wrls
					
					if (_event.name === "file.deleted") {
						delete models[key];
						print("Removed a vanished osgb file at " + _event.fileStruct.key + "\n");
					} else {
						models[key] = _event.data.file;
						models[key].group = '/' + _event.data.file.name.split(pathDelim).slice(0,-1).join('/');
						print("Inserted a new osgb file at " + key + "\n");
					}
				</script>
			</finalize>
		</invoke>
		
		<!-- Start the directory monitor for wrl files -->
		<invoke type="dirmon" id="dirmon.vrml">
			<param name="dir" expr="_x['args']['vrml-path']" />
			<param name="recurse" expr="true" />
			<param name="suffix" expr="'vrml wrl'" />
			<finalize>
				<script>
					_event.key = keyForFile(_event.data.file);
					if (_event.name === "file.existing" || _event.name === "file.added") {
						wrls[_event.key] = _event.data.file;
						print("Inserting wrl " + _event.data.file.path + " from " +_event.data.file.relDir + " at " + _event.key + "\n");
					}
					if (_event.name === "file.deleted") {
						delete wrls[_event.key];
						print("Deleting wrl " + _event.data.file.path + " from " +_event.data.file.relDir + " at " + _event.key + "\n");
					}
				</script>
				<if cond="models &amp;&amp;
						(!(_event.key in models) || wrls[_event.key].mtime > models[_event.key].mtime)">
					<send target="#_osgvonvert.osgb">
						<param name="source" expr="_event.data.file.path" />
						<param name="dest" expr="_x['args']['tmp-path'] + '/' + _event.key + '.osgb'" />
					</send>
				</if>
			</finalize>
		</invoke>
		
		<!-- Start the osgconvert invoker to transform 3D files -->
		<invoke type="osgconvert" id="osgvonvert.osgb">
			<param name="threads" expr="20" />
			<finalize>
				<script>
					//dump(_event);
				</script>
				<if cond="'context' in _event.data">
					<!-- this was generated in reply to a request -->
					<if cond="_event.name.endsWith('success')">
						<respond status="200" to="_event.data.context">
							<header name="Connection" value="close" />
							<header name="Content-Type" value="application/json" />
							<header name="Access-Control-Allow-Origin" value="*" />
							<content expr="_event.data.content[_event.data.format]" />
						</respond>
					<else />
						<respond status="404" to="_event.data.context">
							<header name="Connection" value="close" />
						</respond>
					</if>
				</if>
			</finalize>
		</invoke>
		
		<!-- Start a nested SCXML interpreter to create movies from the images -->
		<invoke type="scxml" id="scxml.ffmpeg" src="ffmpeg-server.scxml" autoforward="true">
			<param name="modelDir" expr="_x['args']['tmp-path']" />
		</invoke>

		<!-- Idle here -->
		<state id="idle">
			<transition event="http.get" target="idle" cond="
					_event.data.pathComponent.length >= 2 &amp;&amp;
					_event.data.pathComponent[_event.data.pathComponent.length - 1].indexOf('.') !== -1">
				<!-- request for a specific format http://host/vrml/relative/path/format?query=string -->
				<script>
					_event.fileStruct = reqToStruct(_event.data);
				</script>
				<if cond="_event.fileStruct.key in models &amp;&amp; isSupportedFormat(_event['fileStruct'].ext)">
					<!-- There is such a file available as osgb -->
					<send target="#_osgvonvert.osgb">
						<param name="source" expr="models[_event['fileStruct'].key].path" />
						<param name="pitch" expr="_event.fileStruct.pitch" />
						<param name="roll" expr="_event.fileStruct.roll" />
						<param name="yaw" expr="_event.fileStruct.yaw" />
						<param name="zoom" expr="_event.fileStruct.zoom" />
						<param name="x" expr="_event.fileStruct.x" />
						<param name="y" expr="_event.fileStruct.y" />
						<param name="z" expr="_event.fileStruct.z" />
						<param name="width" expr="_event.fileStruct.width" />
						<param name="height" expr="_event.fileStruct.height" />
						<param name="autorotate" expr="_event.fileStruct.autorotate" />
						<param name="context" expr="_event.origin" />
					</send>
				<else />
					<!-- There is no such model -->
					<respond status="404" to="_event.origin">
						<header name="Connection" value="close" />
					</respond>
				</if>
			</transition>

			<!-- 
				process request for JSON datastructures 
			-->
			<transition event="http.get" target="idle" cond="
					_event.data.pathComponent.length == 2 &amp;&amp; 
					_event.data.pathComponent[1] === 'models'">
				<script>//dump(_event)</script>
				<respond status="200" to="_event.origin">
					<header name="Connection" value="close" />
					<header name="Content-Type" value="application/json" />
					<header name="Access-Control-Allow-Origin" value="*" />
					<content expr="models" />
				</respond>
			</transition>

			<transition event="http.get" target="idle" cond="
					_event.data.pathComponent.length == 2 &amp;&amp; 
					_event.data.pathComponent[1] === 'wrls'">
				<script>//dump(_event)</script>
				<respond status="200" to="_event.origin">
					<header name="Connection" value="close" />
					<header name="Content-Type" value="application/json" />
					<header name="Access-Control-Allow-Origin" value="*" />
					<content expr="wrls" />
				</respond>
			</transition>

			<!-- request for topmost list of all files -->
			<transition event="http.get" target="idle" cond="
				_event.data.pathComponent.length == 1">
				<script>//dump(_event);</script>
				<respond status="200" to="_event.origin">
					<header name="Connection" value="close" />
					<header name="Content-Type" value="application/json" />
					<header name="Access-Control-Allow-Origin" value="*" />
					<content expr="overviewList()" />
				</respond>
			</transition>

			<!-- XHR CORS preflight response -->
			<transition event="http.options" target="idle">
				<script>//dump(_event);</script>
				<respond status="200" to="_event.origin">
					<header name="Access-Control-Allow-Origin" value="*" />
					<header name="Access-Control-Allow-Methods" value="GET, OPTIONS" />
					<header name="Access-Control-Allow-Headers" value="X-Requested-With" />
				</respond>
			</transition>

			<transition event="render.done" target="idle">
				<script>//dump(_event);</script>
				<respond status="200" to="_event.data.context">
					<header name="Connection" value="close" />
					<header name="Content-Type" valueexpr="_event.data.mimetype" />
					<header name="Content-Disposition" valueexpr="'attachment; filename=' + _event.data.filename" />
					<content expr="_event.data.movie" />
				</respond>
			</transition>

			<transition event="send.codecs" target="idle">
				<script>//dump(_event);</script>
				<respond status="200" to="_event.data.context">
					<header name="Connection" value="close" />
					<header name="Content-Type" valueexpr="_event.data.mimetype" />
					<header name="Content-Disposition" valueexpr="'attachment; filename=' + _event.data.filename" />
					<content expr="_event.data.codecs" />
				</respond>
			</transition>

		</state>
	</state>
	<state id="final" final="true" />
</scxml>