#201: Crashes out of the blue
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Reporter: paulvt | Owner: admin
Type: Bugs | Status: new
Priority: 1 | Milestone:
Component: Liquidsoap | Version: 0.3.8+svn
Resolution: | Keywords:
Mac: 1 | Linux: 1
Netbsd: 1 | Other: 1
Freebsd: 1 |
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Comment (by mrpingouin):
Hi. Thanks for the backtrace, it's very useful.
It says that you're using list.map() in your liq script. This maps a
function which, directly or not, uses list.nth(). Currently, if list.nth()
attempts to access an index that is outside a list, an OCaml-level
exception will be raised: there's no way to handle it at the level of the
liq script, and it even crashes the whole app. Your map() is used
dynamically, during the streaming, and at some point it fails in that way.
In other words it is a programming error in your script -- or perhaps in
our utils.liq, where nth is used in two places that I haven't checked, one
in playlist.once() one for using the metaflac program for getting the
metadata of FLAC files). The bug is that liq should really do more to help
you debug it, maybe handle it.
If you can't spot the error, don't hesitate to show us your script. We may
also be able to help in designing a solution that does not use nth().
I see two ways of fixing the bug. Either we let the exception occur but
catch it as soon as it gets back to the OCaml level. Or we do not allow
any exception to be produced by script executions, which would involve
adding a default value to list.nth() that would be returned when the index
is out of range.
--
Ticket URL: <http://savonet.rastageeks.org/ticket/201#comment:1>
Savonet <http://savonet.rastageeks.org/>
Let's program our stream !
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