I found that on real RSS feeds with hundreds of podcast episodes, the
Soundcloud regular expressions would take, literally, half an hour to run.
The problem is this, on lines 41 and 42 of playlist/soundcloud.lua:
> qargs.thumb_url = p:match('.+content="(.-)"%s+property="og:image"') or ''
> qargs.title = p:match('.+content="(.-)"%s+property="og:title"') or ''
The following is my fixed version:
> qargs.thumb_url = p:match('content="(.-)"%s+property="og:image"') or ''
> qargs.title = p:match('content="(.-)"%s+property="og:title"') or ''
As you can see, the difference is the ".+" at the beginning of the
regex. That ".+" does something evil to cause backtracking and
exponential slowdown. And I do not believe it is needed or used for
anything.
--
Knowledge is Power -- Power Corrupts
Study Hard -- Be Evil
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