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connect-callback

A middleware for Connect and Express that allows sending data to a response stream using the callback API.

It extends the http response object to contain a callback() function which can be invoked directly using the conventional callback API with an (err, result) tuple. The error is transformed to an error HTTP code either by reading the error's .http_code attribute if it exists, or by reverse-lookup in the http.STATUS_CODES dictionary based o nthe error's .name attribute.

Installation

$ npm install connect-callback

Usage Examples

var connect = require("connect")
  , callback = require("connect-callback");
 
connect()
  .use(callback())
  .use( "/somefile" function( req, res ) {
    fs.readFile( "somefile.txt", res.callback ); // will return the file, or a 500 error
  })
  .use( "/admins", function( req, res ) {
    res.callback( { name: "Forbidden" } ); // 403 Forbidden
  })
  .use( "/isvalid", function( req, res ) {
    res.callback( new ValidationError() ); // 400 Bad Request
  })
  .use( "/update", function( req, res ) {
    res.callback( { http_code: 409 } ); // 409 Conflict
  })
  .use( function( req, res ) {
    res.callback( null, "All works!" ); // 200 OK
  })
  .listen(3000);
  
// ValidationError class
function ValidationError( msg ) {
  Error.call( this, msg );
  this.name = arguments.callee.name; // "ValidationError"
};
ValidationError.prototype = Error.prototype;