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armyofda12mnkeys/index.js

Created January 17, 2012 15:23
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simple request handler/router server (requires formidable module installed)
Raw
index.js
var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");
var handle = {}
handle["/"] = requestHandlers.start1;
handle["/start1"] = requestHandlers.start1;
handle["/upload1"] = requestHandlers.upload1;
handle["/start2"] = requestHandlers.start2;
handle["/upload2"] = requestHandlers.upload2;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;
server.start(router.route, handle);
Raw
requestHandlers.js
var querystring = require("querystring");
var formidable = require('formidable');
var util = require('util');//'sys' can be called 'util' now
var fs = require("fs");
//If you would like to prove that an expensive operation behind /start will no longer block requests for /upload from answering immediately
function start1(response, request) {
console.log("Request handler 'start1' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" content="text/html; '+
'charset=UTF-8" />'+
'</head>'+
'<body>'+
'<form action="/upload1" method="post">'+
'<textarea name="text" rows="20" cols="60"></textarea>'+
'<input type="submit" value="Submit text" />'+
'</form>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function upload1(response, request) {
var postData="";
request.setEncoding("utf8");
request.addListener("data", function(postDataChunk) {
postData += postDataChunk;
console.log("Received POST data chunk '"+
postDataChunk + "'.");
});
request.addListener("end", function() {
console.log("Request handler 'upload1' was called.");
response.writeHead(200, {"Content-Type": "text/plain"});
response.write("You've sent postData: " + postData);
response.write("You've sent text input: " + querystring.parse(postData).text );
response.end();
});
}
function start2(response, request) {
console.log("Request handler 'start2' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" content="text/html; '+
'charset=UTF-8" />'+
'</head>'+
'<body>'+
'<form action="/upload2" enctype="multipart/form-data" '+
'method="post">'+
'<input type="text" name="title"><br>'+
'<input type="file" name="upload" multiple="multiple"><br>'+
'<input type="submit" value="Upload">'+
'</form>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function upload2(response, request) {
console.log("Request handler 'upload2' was called.");
var form = new formidable.IncomingForm();
form.parse(request, function(err, fields, files) {//binds its own thing to request.end (so can't use request.end and this as I thought before)
response.writeHead(200, {'content-type': 'text/plain'});
response.write('***received upload:\n\n');
response.end(util.inspect({fields: fields, files: files}));
});
}
function start(response, request) {
console.log("Request handler 'start' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" content="text/html; '+
'charset=UTF-8" />'+
'</head>'+
'<body>'+
'<form action="/upload" enctype="multipart/form-data" '+
'method="post">'+
'<input type="file" name="upload" multiple="multiple">'+
'<input type="submit" value="Upload file" />'+
'</form>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function upload(response, request) {
console.log("Request handler 'upload' was called.");
var form = new formidable.IncomingForm();
console.log("about to parse");
form.parse(request, function(error, fields, files) {
console.log("parsing done");
console.log("FILES:"+ files.upload.path ); //util.inspect({files: files})
fs.renameSync(files.upload.path, "tmp/test1.png");
response.writeHead(200, {"Content-Type": "text/html"});
response.write("received image:<br/>");
response.write("<img src='/show' />");
response.end();
});
}
function show(response) {
console.log("Request handler 'show' was called.");
fs.readFile("tmp/test1.png", "binary", function(error, file) {
if(error) {
response.writeHead(500, {"Content-Type": "text/plain"});
response.write(error + "\n");
response.end();
} else {
response.writeHead(200, {"Content-Type": "image/png"});
response.write(file, "binary");
response.end();
}
});
}
exports.start1 = start1;
exports.upload1 = upload1;
exports.start2 = start2;
exports.upload2 = upload2;
exports.start = start;
exports.upload = upload;
exports.show = show;
Raw
router.js
function route(handle, pathname, response, request) {
console.log("About to route a request for " + pathname);
if (typeof handle[pathname] === 'function') {
handle[pathname](response, request);
} else {
console.log("No request handler found for " + pathname);
response.writeHead(404, {"Content-Type": "text/plain"});
response.write("404 Not found");
response.end();
}
}
exports.route = route;
Raw
server.js
var http = require("http");
var url = require("url");
function start(route, handle) {
function onRequest(request, response) {
var postData = "";
var pathname = url.parse(request.url).pathname;
console.log("Request for " + pathname + " received.");
route(handle, pathname, response, request);
}
http.createServer(onRequest).listen(8888);
console.log("Server has started.");
}
exports.start = start;
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