Yield inside try...finally

[Alan Kennedy]

Michael Sparks wrote:

> What I'd *like* to do (which doesn't work) is:
> 
> try:
>    sock = socket(AF_INET, SOCK_STREAM);
>    try:
>       sock.setblocking(0); yield stage.done(0)
>       try:
>          sock.connect((self.host, self.port)); yield stage.done(1)
>          yield newComponent([self.setupCSA(sock)])
>          while self.waitCSAClose():
>             yield stage.current(2)
>          yield stage.done(2)
>       finally:
>          result = s.shutdown(1) ; yield stage.done(3)
>    finally:
>       sock.close() ; yield stage.done(4)
> except error, e:
>    # Would handle error more interestingly here
>    print stage.lastdone, e
> 

OK, I think this one works now. I've coded and successfully run a dummy
version which reacts properly, even when exceptions are explicitly raised.

The code below obviously won't run, because the "yield"s are used outside of a
function definition. But it is a direct modification of the code you said you
would like to have.

You will still have to *guarantee* that the generator is resumed for this to
work.

#--------------------------------------------------

class Finality(Exception): pass

try:
  sock = socket(AF_INET, SOCK_STREAM);
  try:
    sock.setblocking(0); yield stage.done(0)
    try:
      sock.connect((self.host, self.port)); yield stage.done(1)
      yield newComponent([self.setupCSA(sock)])
      while self.waitCSAClose():
        yield stage.current(2)
      yield stage.done(2)
      raise Finality
    except Exception, x:
      result = s.shutdown(1) ; yield stage.done(3)
      raise x
  except Exception, x:
    sock.close() ; yield stage.done(4)
    raise x
except error, e:
  # Would handle error more interestingly here
  print stage.lastdone, e
except Finality:
  pass

#--------------------------------------------------

fingers crossed behind back, alan hopes he won't embarass
himself again, and gives a nervous smilie :-}

-- 
alan kennedy
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