initial commit

main.js

@@ -0,0 +1,118 @@
+var mapnik = require('mapnik');
+var TC = require('./node-tokyocabinet/build/default/tokyocabinet');
+
+var path = require('path');
+var clutch = require('clutch');
+var hasher = require('crypto').createHash('md5');
+
+var async = require('async');
+
+var queue = async.queue(render,2);
+
+var stylesheet = path.join(__dirname,"style.xml");
+
+console.log("Tokyo Cabinet version " + TC.VERSION);
+
+var HDB = TC.HDB;
+
+var hdb = new HDB;
+
+ if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
+    sys.error(hdb.errmsg());
+  }
+  
+  
+ 
+  
+function render(task, callback) {
+	
+	var map = new mapnik.Map(256,256);
+    map.load(task.stylesheet+".xml");
+    map.zoom_all();
+	
+	map.render(map.extent(),function(data) {
+			
+				if(data) {
+					//TODO clean up tags, different values for different tiles	
+					//var hash = hasher.update(data).digest('hex');
+					var hash = 'dfasdf';
+					task.res.writeHead(200, {
+						'Content-Type': 'image/png',
+						'ETag' : hash,
+						'Cache-Control' : 'max-age=3600',
+						//TODO fix date representation
+						'Expires:' : new Date(new Date().getTime()+3600000),					
+						});
+						
+					task.res.end(data);
+					
+					var temp = 	{
+						'data' 		:	data.toString('base64'),
+						'timestamp'	:	new Date().getTime(),
+						'ETag'		: 	hash,
+					};
+					
+					console.log(temp.timestamp);
+					console.log(temp.ETag);
+					hdb.put(task.url, JSON.stringify(temp));
+					//hdb.put(url, data.toString('base64'));
+				}
+				else {
+					task.res.writeHead(404, {'Content-Type': 'text/plain'});
+					task.res.end();
+				}
+				callback();
+			});
+	
+	
+	
+} 
+
+function render2(worker) {
+	//console.log(worker);
+	worker.finish();
+}
+  
+
+function requestHandler(req, res, style, z, x, y) {
+	//console.log(style, z, x, y);
+	var url = style + "/" + z + "/" + x + "/" + y;
+		
+	hdb.getAsync(url, function(err, value) {
+		//console.log(value);	
+		if(err) {
+			var renderTask = {
+				'url' : url,
+				'res' : res,
+				'stylesheet' : style,
+				'z' : z,
+				'x' : x,
+				'y' : y
+				};
+				
+			queue.push(renderTask, function() {});
+			//var data = map.render_to_string();
+            
+		}
+		else {
+			//console.log(value);
+			res.writeHead(200, {'Content-Type': 'image/png'});
+			res.end(new Buffer( JSON.parse(value).data,'base64')); }
+
+	});
+
+	
+}
+
+
+var myRoutes = clutch.route404([
+				['GET /(\\w+)/(\\d+)/(\\d+)/(\\d+).png$', requestHandler],
+				]);
+
+
+
+
+var http = require('http');
+http.createServer(myRoutes).listen(8080, 'localhost');
+
+