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metaworker_server.js
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metaworker_server.js
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//
// metaworker v0.1
// Copyright (c) 2009 Maciej Adwent, http://buildingsky.net/
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//
//
// metaworker / node.js worker unit - Example server
//
// This is an example server which can serve up the fractal_example and process work units
// on the back end instead of the front end.
//
var sys = require('sys');
var http = require('http');
var posix = require('posix');
var console = {
log: function(){},
debug: function(){},
dir: function(){}
};
var serveFile = function(filename, res, contenttype){
posix.stat(filename).addCallback(function (stats) {
posix.open(filename, process.O_RDONLY, 0666).addCallback(function (fd) {
posix.read(fd, stats.size, 0).addCallback(function(body){
res.sendHeader(200, {"Content-Length": body.length,"Content-Type": contenttype});
res.sendBody(body);
res.finish();
});
});
});
};
var isAFileRequest = function(filepath){
return filepath.indexOf("/")==0 && allowedFiles[filepath.split("/")[1]] == true;
};
var repeatStr = function(str,x){
var result = "";
for(var i=0;i<=x;i++){
result = result + str;
}
return result;
};
var contentType = function(filename){
return ({
"js":"text/javascript",
"json":"application/json",
"html":"text/html"
})[filename.split(".")[1]];
};
var allowedFiles = {
'metaworker_lib.js':true,
'metaworker.js':true,
'fractal_example.html':true,
'block_filler_example.html':true,
'index.html':true
};
var workerUnitCount = 0;
var concurrency = 0;
var port = 8000;
// search for a port parameter in the arguments
for(var i=0;i<process.ARGV.length;i++){
if(process.ARGV[i].indexOf("port=")==0){
if(parseInt(process.ARGV[i].split("port=")[1]) > 0){
port = parseInt(process.ARGV[i].split("port=")[1]);
} else {
throw "Invalid port specified";
}
}
}
http.createServer(function (req, res) {
if(req.uri.path=="/"){
req.uri.path = "/index.html";
}
if (isAFileRequest(req.uri.path)){
//
// Serve a static file
//
var filename = req.uri.path.split("/")[1];
return serveFile(filename, res, contentType(filename));
} else if (req.uri.path == "/metaworker.json") {
workerUnitCount++;
concurrency++;
var d1 = new Date();
var startTime = d1.getTime();
var body;
try {
//
// Complete a metaworker work unit
//
var payload = JSON.parse(req.uri.params.payload);
var func = eval("(" + payload.func + ")");
// sys.puts("Completing work unit "+workerUnitCount);
var result = func.apply(this,payload.args);
body = JSON.stringify(result);
if(req.uri.params.format=="json"){
body = req.uri.params.jsoncallback + "(" + body + ")";
}
res.sendHeader(200, {"Content-Length": body.length, "Content-Type": "application/x-javascript"});
var d2 = new Date();
var endTime = d2.getTime();
sys.puts("Completed work unit "+workerUnitCount+" in "+(d2-d1)+"ms");
} catch(e) {
var errorWrapper = {msg:e};
body = JSON.stringify(errorWrapper);
res.sendHeader(500, {"Content-Length": body.length, "Content-Type": "application/x-javascript"});
var d2 = new Date();
var endTime = d2.getTime();
sys.puts("!!! Work unit "+workerUnitCount+" failed after "+(d2-d1)+"ms Error message: " + e);
}
res.sendBody(body);
res.finish();
concurrency--;
} else {
//
// 404
//
var body = "metaworker - invalid request";
res.sendHeader(404, {"Content-Length": body.length,"Content-Type": "text/html"});
res.sendBody(body);
res.finish();
}
}).listen(port);
sys.puts('Server running at http://127.0.0.1:'+port+'/');