Re: Providing data to a function using a decorator

Not decorators, Tools.

Tools do not need to be turned on and off to do unit testing, they happen
outside the handler context. Unit testing becomes super simple: set up
dummy request and response objects, and call the instantiated method with
the proper arguments. Check the response.

Tools have a lot more flexibility than decorators. There are some six or
seven registration points for tools. Pre-handler tools can register post
handler tools in real time.

Tools can be configured in CONFIG, not in code.

Take a look at the built in tools, and the stuff posted on
http://tools.cherrypy.org/wiki/TitleIndex for inspiration.

On Sat, Nov 5, 2016 at 4:23 PM Johan Hartzenberg <[email protected]>
wrote:

Many of my route handlers go through a sequence of similar steps, eg

def handler_x(self, **kwargs):
  #Check Authentication
  ...
  #Validate Input
  ...
  #Check Authorization
  ....
  #Perform Database Query/Update
  ...
  #Format result into response
  return response

It would seem that this sequence lends itself to being put into
decorators.  I have to some extent put these into functions already, but I
still end up with a lot of code like


def handler_x(self, **kwargs):
  ...
  try:
    dbcursor = ....
  except ..

  Etc etc for every step of the handler

  The format of each of these "decorators" appears to be
  try to get some value (a user-name, a db connection, etc)
  Check whether it was sucesful
  Return a response if not
  Use the response in the next step

So basically imagine

@dict_to_json
@check_authentication (this sets username)
@check_valid_input
@get a database connection (this uses username, and sets a cursor)
@check authorization (this uses username and cursor)
def handler_x(self, **kwargs):
  use username and db_cursor here
  return a result

So the question is how do I get the results from one decorator to be
accessible to the next.

My first thought would be to build on cherrypy.request ... set the results
as properties on there, which can then be accessed by subsequent
functions/decorators... But maybe there is another way that I am not aware
of...



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