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)
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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