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Re: Execute function before exit of do() block

by moritz (Cardinal)
on Jan 29, 2014 at 19:04 UTC ( #1072561=note: print w/replies, xml ) Need Help??


in reply to Execute function before exit of do() block

One technique you can use is a "scope guard"; an object which goes out of scope when a scope is exited. When it goes out of scope, its reference count drops to zero and its DESTROY method is called:

# slave.pl: use 5.014; use warnings; my $CleanExit = 0; { package My::ScopeGuard; sub DESTROY { return if $CleanExit; say 'cleaning up slave.pl'; } } # this is the object that will go out of scope my $guard = bless {}, 'My::ScopeGuard'; say 'doing something'; die "Oh Noez"; # or if everything works fine: $CleanExit = 1;

Now we can test it likes this:

$ perl -wE 'do "slave.pl"; say "Back in master"' doing something cleaning up slave.pl Back in master

You can see that the cleanup happens before the the rest of the calling code.

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Re^2: Execute function before exit of do() block
by shmem (Canon) on Jan 29, 2014 at 20:58 UTC

    I've been thinking about this, too, prior to writing my $SIG{__DIE__} answer above.
    *sigh*
    Creating a sentinel object... slowly, the objectification creeps on every subject...

    perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

      Well, in Perl 6 there are are non-object options, like a LEAVE block that is called on every scope exit, or an UNDO block for unsuccessful scope exists.

      I wonder if those are possible (and worthy) to backport to perl 5...

        Maybe that could be done in a cheap way overriding eval. Brrr... just as I am writing this, overriding eval feels very evil... ;-)

        perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
      You could use clear or free magic if you wanted to avoid objects.

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[makita]: Need to sign more elements but all types I put in array are ignored. And is always signed only the body
[Discipulus]: no makita sorry. i see in the synopsis of the module: "WARNING: Only limited real-life experience" might be better compose a SOPW with some code example and data
[Discipulus]: ..or inspect the source code of the module
[makita]: I am doing this:
[makita]: my $sig = $wss->signature( schema => $wsdl, token => $token, sign_types=>'wsa: Action','wsa:To', 'wsu:Timestamp', 'wsa:MessageID',' SOAP-ENV:Body', signer=>DSIG_RSA_S HA1, public_key => $cert,
[Corion]: Oof, I haven't done much with signing SOAP requests. markov is usually somebody good to ask via mail ;)
[makita]: I need to create a SOAP call where are signed more types not only the body
[makita]: I am inspecting it second day :)
[makita]: Thanks
[Discipulus]: better to ask a full SOPW

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