[Twisted-Python] Bring multi service up gradually

[David Pratt]

Hi Thomas. Thank you for your reply. Yes, this might be a plan for 
starting services. I'll look at how something like this could work with 
my config since I am not using twisted app in this case but integrated 
with another daemon service. Many thanks.

Regards,
David

Thomas Jacob wrote:
> Why not simply start the additional
> services from the startFactory-method of your mainservice'
> protocol factory?
> 
> i,e,:
> 
> class MainServiceFac(ServerFactory):
>     def startFactory(self):
>            <possibly call parent's startFactory>
>            reactor.listenTCP(.... subservice 1)
>            reactor.listenTCP(.... subservice 2)....
>            
> 
> 
> 
> On Fri, 2006-06-16 at 10:39 -0300, David Pratt wrote:
>> Chaz. wrote:
>>> I don't think there is a way to insure you will get the ports you want.
>>> Why bother testing if the port is available before hand? In between the
>>> port being tested and the application using it someone can sneak in and
>>> take it.
>> Hi Chaz. Thank you for your reply. The reason for the test is that I 
>> don't want the other services to start at all if a connection cannot be 
>> found to run the main service. I was thinking of writing a simple tester 
>> using socket module to determine which addresses are alive first. When 
>> it finds one it stops so in my logic I give this address to my 
>> ListenTCP/SSL and attempt to start the main service.
>>
>> I don't expect the address list to be large. This way no time is lost 
>> with the client running through a long backoff cycle on an address that 
>> may not be alive only to have to stop it and try a another until one is 
>> possibly found.
>>
>> I am not aware of something in twisted that evaluates addresses like 
>> this as part of a startup solution. In any case, if I see that an 
>> address in the list is available, then I would start my main service 
>> using it.  When a connection is made to the main address, then I want to 
>> start the remaining services since they are useless without the main 
>> service.
>>
>> Regards,
>> David
>>
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