mirror of
https://github.com/booo/node_tile.git
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144 lines
3.5 KiB
JavaScript
144 lines
3.5 KiB
JavaScript
var config = require('./config'); //include config file
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var mapnik = require('mapnik');
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var TC = require('./node-tokyocabinet/build/default/tokyocabinet');
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var path = require('path');
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var clutch = require('clutch');
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//var hasher = require('crypto').createHash('md5');
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var async = require('async');
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var queue = async.queue(render,2);
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var stylesheet = path.join(__dirname,"style.xml");
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console.log("Tokyo Cabinet version " + TC.VERSION);
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var HDB = TC.HDB;
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var hdb = new HDB;
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if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
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sys.error(hdb.errmsg());
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}
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function writeResponse(content, res) {
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res.writeHead(200, {
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'Content-Type': 'image/png',
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'ETag' : content.ETag,
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//'Cache-Control' : 'max-age=3600',
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'Expires:' : content.Expires,
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});
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res.end(new Buffer(content.data,'base64'));
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}
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function render(task, callback) {
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var map = new mapnik.Map(256,256);
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map.load(task.stylesheet+".xml");
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map.zoom_all();
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map.render(map.extent(),function(data) {
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if(data) {
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//TODO clean up tags, different values for different tiles
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var temp = {
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'data' : data.toString('base64'),
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'timestamp' : new Date().getTime(),
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'ETag' : require('crypto').createHash('md5').update(data).digest('hex'),
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'Expires' : new Date(new Date().getTime()+3600000).toGMTString(),
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};
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writeResponse(temp,task.res)
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//console.log(temp.timestamp);
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//console.log(temp.ETag);
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//TODO do async
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hdb.put(task.url, JSON.stringify(temp));
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//hdb.put(url, data.toString('base64'));
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hdb.putAsync(task.url, JSON.stringify(temp), function(err) {
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if(err) {
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console.log(err);
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}
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});
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}
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else {
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task.res.writeHead(404, {'Content-Type': 'text/plain'});
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task.res.end();
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}
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callback();
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});
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}
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function requestHandler(req, res, style, z, x, y) {
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//console.log(style, z, x, y);
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var url = style + "/" + z + "/" + x + "/" + y;
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hdb.getAsync(url, function(err, value) {
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//console.log(value);
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if(err) {
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var renderTask = {
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'url' : url,
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'res' : res,
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'stylesheet' : style,
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'z' : z,
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'x' : x,
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'y' : y
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};
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queue.push(renderTask, function() {});
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//var data = map.render_to_string();
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}
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else {
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//console.log(value);
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var content = JSON.parse(value);
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//TODO changeable expire time... 1000*60*60*24 = one day
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if((new Date().getTime() - content.timestamp) > 1000*30) {
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//rerender
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var renderTask = {
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'url' : url,
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'res' : res,
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'stylesheet' : style,
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'z' : z,
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'x' : x,
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'y' : y
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};
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//response is send in render function
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queue.push(renderTask, function() {});
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}
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else {
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//tile is not expired
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writeResponse(content, res);
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}
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}
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});
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}
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var myRoutes = clutch.route404([
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['GET /(\\w+)/(\\d+)/(\\d+)/(\\d+).png$', requestHandler],
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/*['HEAD /(\\w+)/(\\d+)/(\\d+)/(\\d+).png$', requestHandler],
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['GET /(\\w+)/(\\d+)/(\\d+)/(\\d+).png/dirty$', requestHandler],
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['HEAD /(\\w+)/(\\d+)/(\\d+)/(\\d+).png/dirty$', requestHandler],
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['GET /(\\w+)/(\\d+)/(\\d+)/(\\d+).png/status$', requestHandler],
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['HEAD /(\\w+)/(\\d+)/(\\d+)/(\\d+).png/status$', requestHandler],*/
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]);
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var http = require('http');
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http.createServer(myRoutes).listen(8000, 'localhost');
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