Hi,
First I apologise if I'm being dense, but this problem is really confusing the heck
out of me...
I've written a photo archive script using CGI::Application (ver. 3.21) and
HTML::Template (ver. 2.6), which ran fine as a standalone CGI script. Now I've ported
it across to using mod_perl, and I'm noticing a really strange intermittent problem.
Basically it seems that sometimes, especially when you request a page for the first
time for a long while, when HTML::Template opens the .tmpl file what it gets is being
somehow corrupted. This evidences itself as an error about not recognising the
TMPL_... tag - I tweaked the error message slightly to print the content of the $which
variable (which should hold the tag being parsed, it seems?) - this comes from line
2230:
HTML::Template->new() : Unknown or unmatched TMPL construct (T0B5
What it *should* be printing is the contents of the $which variable in brackets, but
it seems there are some weird control characters which trash the rest of the string
somehow (at least that's my guess). I haven't put enough trace in to be able to tell
the entire contents of the file that's being read - perhaps this is just trampling the
$which variable rather than the whole file? In case it's useful, the line as I've
amended it is:
die "HTML::Template->new() : Unknown or unmatched TMPL construct ($which
) at $fname : line $fcounter.";
I think what I'm doing should be fairly standard - I'm calling tmpl_path() of
CGI::Application in the cgiapp_prerun() method, and then the tmpl_load() method later
on - it's at this point the error occurs.
Anyway, I realise this isn't necessarily a HTML::Template problem, but I figured it
was a good place to start since presumably some of you have experience of using
HTML::Template with mod_perl, and the potential problems. My best guess is that
somehow running the script on a newly created sub-process is causing the problem, but
I can't for the life of me see how - the fact that the open succeeds, but then we get
garbage later, is what baffles me.
I've tried this with and without caching of templates - caching seemed to make the
problem happen less often, but that might have been my imagination. Also, reloading
the page a few times usually sorts the problem out, which seems vaguely consistent
with the "sub-process opening a file for the first time" problem.
Any help would be greatly appreciated, even if it's simply a more appropriate place to
redirect requests for help! Also any options to any of the code involved to produce
more helpful logs would be really handy - I'm completely new to using mod_perl so I
may well have fallen foul of some common trap!
Cheers,
- Andy
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