Limit connection rate to harbor sources
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                 Key: LS-505
                 URL: http://dev.sourcefabric.org/browse/LS-505
             Project: Liquidsoap
          Issue Type: New Feature
          Components: Liquidsoap
    Affects Versions: 1.0
         Environment: any
            Reporter: Romeo


It will be very usefull to have a feature that limits connection rate to harbor 
mount points in order to prevent broadcasting via poor quality internet 
connections.

For example, we have 2 harbor mount points on radiovkontakte.ru - playlist.ogg 
and live.ogg. They are connected by switch operator and live has greater 
priority. But when there's a live broadcast from a club via ADSL, 4G (Moblie 
WiMAX) or any other asynchronous connection it's sometimes not enough bandwidth 
to feed a harbor source. This results in a constant live client reconnection 
and switching between live/playlist. This process is very annoying for 
listeners and makes them go away from our station. The live shows cannot be 
controlled for the quality every time they starts ( as we have about 3 per day 
) and even if we have noticed that a DJ has a poor bandwidth it's not always 
possible to bring the live show down.

It will be great to have a control over a connection rate parameter per IP or 
per client basis (or just a limit at first) like iptables have. Say I put 
connection limit of 2 times per minute and when it comes over that rate, the 
mount point becomes locked for a certain period of time for that IP or client 
(e.g. 2 hours - an average time of the live mix). This will prevent poor 
quality shows from going live.

We use an iptables limit at the moment but it doesn't have enough flexibility 
for our purposses.

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