motor.DataServer suggestion

gistfile1.py

# related parts of motor.DataServer suggestion
# something along the lines of...

class DataServer(object):
    @tornado.gen.engine
    def stream(self, handler, file_id):
        fs = yield motor.Op(motor.MotorGridFS(db).open)
        try:
            gridout = yield motor.Op(fs.get, file_id)
        except NoFile:
            handler.send_error(404)
        return gridout.stream(handler) # which sets headers

class FileServeHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    def get(self, file_id):
        motor.DataServer().stream(self, file_id)