compare event based handling of post-request with piping

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•

Gordon

I had some code for handling multipart form data here if it helps:

var fileNo = 0;

function onPageRequest(req, res) {
  var d = "";
  var boundary;
  var f;
  req.on('close', function() { 
    if (f) {
      f.close();
      console.log("File uploaded");
    }
  });
  req.on('data', function(data) { 
    d += data;
    if (f) {
      var idx = d.indexOf(boundary);
      /* ensure we always leave some in our buffer
      in case boundary straddles packets */
      if (idx>=0) {
        console.log("Boundary found - starting again");
        f.write(d.substring(0, idx));
        f.close();
        f = undefined;
      } else {
        idx = d.length-boundary.length; 
        f.write(d.substring(0, idx));
      }
      d = d.substring(idx);
    } else {
      var idx = d.indexOf("\r\n\r\n");
      if (idx>=0) {
        var header = d.substring(0,idx).split("\r\n");
        boundary = "\r\n"+header.shift();
        header = header.map(function(x){return x.split(": ");});
        console.log(JSON.stringify(header));  
        // choose a filename
        var fileName = "f"+fileNo+".txt";
        console.log("Writing to "+fileName);
        f = E.openFile(fileName, "w");
        fileNo++;
        d = d.substring(idx+4);
      }
    }
  });
  res.writeHead(200, {'Content-Type': 'text/html'});
  res.write('<html><body><form method="post" enctype="multipart/form-data">');
  res.write('<input type="file" name="file1" id="file"><input type="file" name="file2" id="file"><input type="submit">');
  res.end('</form></body></html>');
}
require('http').createServer(onPageRequest).listen(8080);

compare event based handling of post-request with piping

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