A Simple node.js HTTP webserver with some file IO and graphdat integration

simple-webserver-with-file-IO-and-graphdat.js

require('graphdat').config({suppress:{context_pop_automatic:true}}); // require the graphdat module first, always!
var fs = require("fs"); // require the Filesystem module so we can read and write files
var http = require("http"); // require the HTTP module

//
// ### function createServer (requestCallback)
// #### @requestCallback {function} function is called on every request made.
//
http.createServer(function (request, response) {

  request.on('end', function () {
    // Check if user requests / (so we don't have to worry about favicon.ico)
    if (request.url == '/') {
      // tell graphdat to instrument this
      request.graphdat.begin('start reading a file');
      // Read a file.
      fs.readFile('test.txt', 'utf-8', function (error, data) {
        // tell graphdat the event is over
        request.graphdat.end('start reading a file');

        // start another trace
        request.graphdat.begin('response.write');
        // Write headers.
        response.writeHead(200, {
          'Content-Type': 'text/plain'
        });

        // Write out the text file to the user
        // Graphdat is smart enough to know the trace is still open
        // and will automatically add in the 'end' on its own.  Thats
        // why we added that extra config option in the require
        response.end(data);
      });
    } else {
      request.graphdat.begin('response.write 404');
      // Indicate that requested file was not found.
      response.writeHead(404);
      // And end request without sending any data.
      // Graphdat is smart enough to end the trace on its own
      response.end();
    }
  });
// Listen on the 8080 port.
}).listen(8080);
console.log('Server running at http://127.0.0.1:8080/');