RE: PerlOptions Clone/Parent in mp2
On Thu, 2003-06-12 at 02:59, Marc M. Adkins wrote:
The code to implement blocks (e.g. TIPool.../TIPool) in
config files is
pretty gnarly, too. I know it's already there for Perl, it's
one of the
places I looked when I was considering doing one of my own and
wanted to see
an example. The Apache framework is pretty strong for putting in new
directives, but not so much for adding new blocks.
Actually you can't quite do that in a 3rd party module. Currently
the pools
are internal to mod_perl. Making this customizable will require
adding hooks
to the internal tipool mechanism. When I wrote the above
pseudo-config I was
suggesting an internal support for these.
I was actually not figuring to do it myself. ;)
I was commenting on the code required to implement things like Perl or
TIPool. I've since queried the httpd-dev list and the 'official' example
is in the source for mod_proxy (with a caveat that a three-pass config file
parser may necessitate further changes at some point). It appears to be a
lot simpler than the parsing that mod_perl is doing. I was wondering...is
there a specific reason mod_perl implements Perl the way it does or is it
just code inertia?
With something like a Proxy http://foo/*/Proxy block, mod_proxy does
the right thing ( and the simple ) of using the power of
ap_walk_config() to handler the parsing of the contents of the block.
You might want to do the same thing for something like TiPool,
allowing things like
Server
MaxTiPoolConn 10
TiPoll special
MaxTiPoolConn 20
/TiPool
And have each directive in the TiPool block be handled like regular
apache directive with all the cool benefits of configuration merging,
etc.
Reason Perl blocks can't do that is becasue we can't let httpd try and
parse perl code and make any sense of it. If you look closely, a Perl
block simply slurps all its contents and feeds it to perl for
processing.
Hope this makes sense.
mma
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RE: PerlOptions Clone/Parent in mp2
With something like a Proxy http://foo/*/Proxy block, mod_proxy does the right thing ( and the simple ) of using the power of ap_walk_config() to handler the parsing of the contents of the block. [...snip...] Reason Perl blocks can't do that is becasue we can't let httpd try and parse perl code and make any sense of it. If you look closely, a Perl block simply slurps all its contents and feeds it to perl for processing. Ah...I see...it's the MP_CMD_SRV_RAW_ARGS_ON_READ which translates into AP_INIT_RAW_ARGS with the all-important EXEC_ON_READ flag that allows you to waylay the configuration file on the way in. Otherwise the directives are partially processed and constructed into a tree, which you don't want. Turns out mod_macro does the same thing. Doesn't apply to my code, thank goodness. thx, mma
RE: PerlOptions Clone/Parent in mp2
The code to implement blocks (e.g. TIPool.../TIPool) in config files is pretty gnarly, too. I know it's already there for Perl, it's one of the places I looked when I was considering doing one of my own and wanted to see an example. The Apache framework is pretty strong for putting in new directives, but not so much for adding new blocks. Actually you can't quite do that in a 3rd party module. Currently the pools are internal to mod_perl. Making this customizable will require adding hooks to the internal tipool mechanism. When I wrote the above pseudo-config I was suggesting an internal support for these. I was actually not figuring to do it myself. ;) I was commenting on the code required to implement things like Perl or TIPool. I've since queried the httpd-dev list and the 'official' example is in the source for mod_proxy (with a caveat that a three-pass config file parser may necessitate further changes at some point). It appears to be a lot simpler than the parsing that mod_perl is doing. I was wondering...is there a specific reason mod_perl implements Perl the way it does or is it just code inertia? mma
Re: PerlOptions Clone/Parent in mp2
Marc M. Adkins wrote: wrt Apache 2.0, mod_perl 2.0... I'm not using Clone or Parent at the current time, but I was re-reading the documentation on them for an unrelated reason and started thinking about how they would work. Suppose I want to set up five virtual hosts with modules A - E. Then I want to set up six virtual hosts with modules F - M. The first five virtual hosts can all share a pool of interpreters and the second six virtual hosts can share a different pool of interpreters. How might I declare two parent interpreters globally, one with modules A - E and the other with modules F - M such that I could share a pool of interpreters derived from the first parent with five virtual hosts and a pool of interpreters derived the second parent with a different six virtual hosts? This is all theoretical, I don't actually need this right now, and probably won't ever. Just trying to imagine how these options would be used. Currently you can't do that. Each vhost can inherit from the base server perl, clone it or start a while new pool of interpreters. However I think it is possible to make the architecture more flexible to allow pools sharing across specific vhosts, or even location containers (if the scope is set to be only for the handler). e.g. something like: #base server TIPool A # parameters /TIPool TIPool B # parameters /TIPool VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost Of course we are talking about threaded mpms here. __ Stas BekmanJAm_pH -- Just Another mod_perl Hacker http://stason.org/ mod_perl Guide --- http://perl.apache.org mailto:[EMAIL PROTECTED] http://use.perl.org http://apacheweek.com http://modperlbook.org http://apache.org http://ticketmaster.com
RE: PerlOptions Clone/Parent in mp2
However I think it is possible to make the architecture more flexible to allow pools sharing across specific vhosts, or even location containers (if the scope is set to be only for the handler). e.g. something like: #base server TIPool A # parameters /TIPool TIPool B # parameters /TIPool VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost Yeah, that would do it. I don't know how many people will need this, probably not so many. And there might be a sufficient work-around in those rare (?) cases involving multiple Apache instantiations and a proxy server to tie it all together. Something like the high-volume configurations I've seen documented, only with one mod_perl-enhanced server for each TIPool. The code to implement blocks (e.g. TIPool.../TIPool) in config files is pretty gnarly, too. I know it's already there for Perl, it's one of the places I looked when I was considering doing one of my own and wanted to see an example. The Apache framework is pretty strong for putting in new directives, but not so much for adding new blocks. mma
Re: PerlOptions Clone/Parent in mp2
Marc M. Adkins wrote: However I think it is possible to make the architecture more flexible to allow pools sharing across specific vhosts, or even location containers (if the scope is set to be only for the handler). e.g. something like: #base server TIPool A # parameters /TIPool TIPool B # parameters /TIPool VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool A /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost VirtualHost ... PerlUseTiPool B /VirtualHost Yeah, that would do it. I don't know how many people will need this, probably not so many. And there might be a sufficient work-around in those rare (?) cases involving multiple Apache instantiations and a proxy server to tie it all together. Something like the high-volume configurations I've seen documented, only with one mod_perl-enhanced server for each TIPool. The code to implement blocks (e.g. TIPool.../TIPool) in config files is pretty gnarly, too. I know it's already there for Perl, it's one of the places I looked when I was considering doing one of my own and wanted to see an example. The Apache framework is pretty strong for putting in new directives, but not so much for adding new blocks. Actually you can't quite do that in a 3rd party module. Currently the pools are internal to mod_perl. Making this customizable will require adding hooks to the internal tipool mechanism. When I wrote the above pseudo-config I was suggesting an internal support for these. __ Stas BekmanJAm_pH -- Just Another mod_perl Hacker http://stason.org/ mod_perl Guide --- http://perl.apache.org mailto:[EMAIL PROTECTED] http://use.perl.org http://apacheweek.com http://modperlbook.org http://apache.org http://ticketmaster.com
