Open Stack

That's exactly what https://github.com/koder-ua/os_api is for: it
polls status changes in a separate thread and then updates the
futures, so that you can wait on multiple futures at once.

On Mon, Jul 4, 2016 at 2:19 PM, Denis Makogon <lildee1991 at gmail.com> wrote:
>
>
> 2016-07-04 13:22 GMT+03:00 Roman Podoliaka <rpodolyaka at mirantis.com>:
>>
>> Denis,
>>
>> >  Major problem
>> > appears when you trying to provision resource that requires to have some
>> > time to reach ACTIVE/COMPLETED state (like, nova instance, stack, trove
>> > database, etc.) and you have to use polling for status changes and in
>> > general polling requires to send HTTP requests within specific time
>> > frame
>> > defined by number of polling retries and delays between them (almost all
>> > PaaS solutions in OpenStack are doing it that might be the case of
>> > distributed backend services, but not for async frameworks).
>>
>> How would an asynchronous client help you avoid polling here? You'd
>> need some sort of a streaming API producing events on the server side.
>>
>
> No, it would not help me to get rid of polling, but using async requests
> will allow to proceed with next independent async tasks while awaiting
> result on async HTTP request.
>
>>
>> If you are simply looking for a better API around polling in OS
>> clients, take a look at https://github.com/koder-ua/os_api , which is
>> based on futures (be aware that HTTP requests are still *synchronous*
>> under the hood).
>>
>> Thanks,
>> Roman
>>
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