Re: alternate parent selection algorithms

Duane Wessels writes:
>Niilo Neuvo writes:
>
>>I am in the process of writing a method to add an alternate parent
>>selection algorith. What I want to do is to add a custom C-function
>>to the squid executable and call that function with the URL being
>>requested to determine the correct parent. After thinking about the
>>different approaches possible with this method it seems that I am
>>unable to write an algorithm to suit the needs of every Squid
>>administrator. So it seems that a generic squid parent selection api
>>would do the trick.
>>
>>squid.conf would read:
>>cache_peer /foo/file.so:func parent 3128 3130 proxy-only,default,parent_proc
>>
>>I would add a few lines to cache_cf.c parse_peer -function:
>> - dlopen() the .so file
>> - add the function from .so to peer structure
>>A few lines to forward.c fwdStartComplete -function:
>> - if(p->options.parent-proc)
>> - call the function with the url as a parameter
>> - and store the returned values to s->host, s->port
>>
>>In addition to this ./configure needs to be modified to somehow
>>support dlopen() and the sometimes required -ldl library. I have
>>never written a ./configure and am a little unfamiliar on how it
>>works.
>>
>>The reason why I am explaining you all this is that I don't want to
>>support my own branch of squid. I'd rather see my patch added into
>>the squid release at some stage. Please inform me if this approach is
>>something you'd like to be implemented in squid (otherwise I have to
>>start living with apache and the horrible amounts of memory it uses).
>
>We can probably add this to our source tree, most likely in
>#ifdefs.
>
>Send us a patch and we'll check it out.

Unfortunately it seems that patching carp.c does the trick more
easily.

Or do you actually find a way of pseudo dynamically expanding squid
useful?

-- 
     Niilo Neuvo                   >>>^<<<       niilo.neuvo@saunalahti.fi
     Technical Director              /¤\      +358 (0) 50 5611042 (mobile)
     SAUNALAHDEN SERVERI OY          | |         +358 (0) 3 31558042 (fax)
     .¸¸.·´´¯·.¸¸.·´´¯·.¸¸.·´´¯·.¸¸.oOOOo.¸¸.·´´¯·.¸¸.·´´¯·.¸¸.·´´¯·.¸¸.·´