txamqp-user team mailing list archive

[launchpad@xxxxxxxxxxxxxxxxxxx]

On Fri, Oct 09, 2009 at 03:59:35PM +0200, Esteve Fernandez wrote:
> Hi
> 
> On Fri, Oct 9, 2009 at 10:32 AM,  <launchpad@xxxxxxxxxxxxxxxxxxx> wrote:
> >> uhm, never tried sorry
> > It looks like txAMQP lacks some error detection features and when something
> > erroneous happens, your program get stuck, since on error no callback is called,
> > but also no errback. :(
> 
> There's a question in the Answers section of the Launchpad page, which
> is fairly similar:
> 
> https://answers.launchpad.net/txamqp/+question/84002
> 
> The standard states that in case of any error, the connection will be
> closed.
But there was also something about sending the client a message with
the error description, just before the connection is dropped by the server.
It is not obvious, how would such messages be routed to one's application
via txamqp. I feel, that the code is simply missing. Tell me I was wrong, please!

> But, in any case, errbacks are actually called if an error
> happens (it just happens to be a Closed exception), e.g using the
> inlineCallbacks idiom:
I have never seen that, when experimented! Are you sure? I just going to
try it all again now with some hope!

> 
> yield channel.exchange_declare(exchange=name, type=type,
> durable=durable, auto_delete=auto_delete)
> try:
>         yield channel.exchange_declare(exchange=name, type=type,
> durable=durable, auto_delete=auto_delete)
> except Closed, mess: # You can't redeclare an exchange
>         print 'E1: %s' % mess
> 
> > It is still possible to use twisted with pyamqplib (as with any other syncronous
> > library) by moving all blocking calls out of reactor thread.
> > It is often preferable to put it into separate process (security & perfomance),
> > that will serve some RPC-like service, you may ever implement it in twisted.
> > But, as you can see, some effort is required.
> 
> BTW, if you want to do RPC over txAMQP, you may want to have a look at
> Thrift and the examples in src/examples/thrift
Yes, thrift looks good!

> 
> Cheers.

-- 
с уважением,
Алексей Шпагин
системный администратор
цеха передачи данных
технического центра телекоммуникаций
ОАО "ВолгаТелеком" 
филиал в Удмуртской республике.