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booo 2011-03-03 21:16:41 +01:00
parent cd953d66ff
commit c46ef2d868
1 changed files with 77 additions and 31 deletions
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108
main.js
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@ -1,16 +1,21 @@
var config = require('./config'); //include config file
var mapnik = require('mapnik');
var TC = require('./node-tokyocabinet/build/default/tokyocabinet');
var path = require('path');
var clutch = require('clutch');
var mercator = require('mapnik/sphericalmercator')
var mappool = require('mapnik/pool')
//var hasher = require('crypto').createHash('md5');
var async = require('async');
//var async = require('async');
var queue = async.queue(render,2);
//var queue = async.queue(render,2);
var stylesheet = path.join(__dirname,"style.xml");
var stylesheet = path.join(__dirname,"/mapnik/osm_new.xml");
/*var stylesheet = path.join(__dirname, "node-mapnik/examples/stylesheet.xml")*/
var maps = mappool.create(2);
console.log("Tokyo Cabinet version " + TC.VERSION);
@ -18,10 +23,10 @@ var HDB = TC.HDB;
var hdb = new HDB;
if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
sys.error(hdb.errmsg());
}
}
function writeResponse(content, res) {
res.writeHead(200, {
'Content-Type': 'image/png',
@ -32,20 +37,56 @@ function writeResponse(content, res) {
res.end(new Buffer(content.data,'base64'));
}
var acquire = function(id,options,callback) {
methods = {
create: function(cb) {
var obj = new mapnik.Map(256, 256);
try {
obj.load(id);
}
catch (err) {
callback(err,null);
}
cb(obj);
},
destroy: function(obj) {
obj.clear();
delete obj;
},
idleTimeoutMillis: 20000,
}
maps.acquire(id, methods, function(obj) {
callback(null, obj);
});
}
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) {
acquire(stylesheet,{}, function(err, map) {
if(err) {
console.log(err);
}
else {
console.log("map acquired\n")
//map.zoom_to_box(tile2long(task.x,task.z),tile2lat(task.y,task.z),tile2long(task.x+1,task.z),tile2lat(task.y+1,task.z));
//map.zoom_all()
//var bbox = [tile2lat(task.y,task.z),tile2long(task.x,task.z),tile2lat(task.y-1,task.z),tile2long(task.x-1,task.z)];
//var bbox = [13.0882097323,52.3418234221,13.7606105539,52.6697240587]
//map.zoom_all()//map.zoom_to_box(extent);
//map.zoom_all();
var bbox = mercator.xyz_to_envelope(task.x, task.y, task.z, false)
map.render(bbox,"png",function(error,data) {
//console.log(data)
console.log("tile rendered");
if(!error) {
//TODO clean up tags, different values for different tiles
var temp = {
'data' : data.toString('base64'),
'timestamp' : new Date().getTime(),
@ -54,27 +95,31 @@ function render(task, callback) {
};
writeResponse(temp,task.res)
//console.log(temp.timestamp);
console.log(temp.data)
//console.log(temp.timestamp);
//console.log(temp.ETag);
//TODO do async
hdb.put(task.url, JSON.stringify(temp));
//hdb.put(task.url, JSON.stringify(temp));
//hdb.put(url, data.toString('base64'));
hdb.putAsync(task.url, JSON.stringify(temp), function(err) {
if(err) {
console.log(err);
}
}
else {
console.log("tile saved")
}
});
}
else {
console.log(error.message)
task.res.writeHead(404, {'Content-Type': 'text/plain'});
task.res.end();
}
callback();
});
}
});
}
function requestHandler(req, res, style, z, x, y) {
@ -88,31 +133,32 @@ function requestHandler(req, res, style, z, x, y) {
'url' : url,
'res' : res,
'stylesheet' : style,
'z' : z,
'x' : x,
'y' : y
'z' : parseInt(z),
'x' : parseInt(x),
'y' : parseInt(y)
};
queue.push(renderTask, function() {});
//queue.push(renderTask, function() {});
//var data = map.render_to_string();
render(renderTask,function() {});
}
else {
//console.log(value);
var content = JSON.parse(value);
//TODO changeable expire time... 1000*60*60*24 = one day
if((new Date().getTime() - content.timestamp) > 1000*30) {
if((new Date().getTime() - content.timestamp) > 1000*60*60) {
//rerender
var renderTask = {
'url' : url,
'res' : res,
'stylesheet' : style,
'z' : z,
'x' : x,
'y' : y
'z' : parseInt(z),
'x' : parseInt(x),
'y' : parseInt(y)
};
//response is send in render function
queue.push(renderTask, function() {});
/*queue.push(renderTask, function() {});*/
render(renderTask,function() {});
}
else {
//tile is not expired