2011/8/16 Romain Beauxis <[email protected]>:
> 2011/8/11 Martin Hamant <[email protected]>:
>> Hi all !!
>
> Hi!
>
>> For now my app updates metadata via a telnet command like
>> xxx.insert title="my title"
>>
>> the title string is retrieved from an url by my app.
>>
>> It works fine BUT, the code to handle this is something heavy...
>> (thread, etc) and more, if the app close, metadata are not updated
>> anymore. And my aim was just to control liquidsoap features, somehow
>> based on "client/server".
>> I mean, if I start to implement things that liquidsoap can do itself
>> internaly, it doesn't make sense...
>> As I am pretty sure that liquidsoap can handle this, I am asking for
>> advices :)
>>
>> I see there is a http.get(), with which I can retrieve the content of a
>> remote file.
>> How do I implement the periodical "go grab the content, and if it has
>> changed then updated it, else; keep the previous". ?
>
> add_timeout + http.get + insert_metadata :-)
> Something like this:
>
> # A source
> s = (...)
>
> # Attach metadata insertion hooks
> x = insert_metadata(s)
> insert = fst(x)
> s = snd(x)
>
> # A reference to the latest metadata
> latest_meta = ref []
>
> # A function to update metadata
> def update_meta() =
> data = http.get(...)
> m = (..parse data here..)
> if m != !latest_meta then
> latest_meta := m
> insert_metadata(m)
Shut, sorry you should have read this for the previous line:
insert(m)
> end
> # Restart in 10. seconds
> 10.
> end
>
> # Start polling now
> add_timeout(0., update_meta)
>
> I have not tested this code but I think it should be close to working
> and also close to what you describe :-)
>
> Romain
>
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