Geoffrey Young wrote:
yeah, that was my thought. I started working on that but couldn't
quite see all the pieces. here's what I have so far - it should
compile cleanly and be good for a start, but it doesn't do anything
(yet) due to the missing hooks.
But then you create a whole new filter, so whatever work is done in
filter_init is lost. I guess you could still pass notes via the
connection record. I thought that you want to create a filter early,
run init on it and then use the same filter to do the real filtering.
well, I'm thinking about two scenarios here.
the first is that a filter only needs filter_init to do some scut work -
like update_mtime(), which is a required activity but does not need to
be communicated _back_ to the filter that called the init. this is the
type of thing that mod_include does (sets f->r->no_local_copy = 1) and
that I was first interested in.
Can't you just use an early request phase for that? For protocols you can use
PreConnection phase.
the other is when info _does_ need to come back to the calling filter,
say via $filter->ctx or something.
the first could be handled with just a hook into filter_init - maybe by
adding a whole new NULL filter with just the init (which probably won't
work, but is worth a try), or adding a no-op filter. this would
basically allow for anybody to add arbitrary code before request
handlers run, which could be cool even outside of filters.
Indeed, from your requirements it looks like this filter_init has little to do
with the real filter and you may want to have just filter_init without having
any real filters. The problem I think (need to look deeper in the code) is
that the request filter chain won't be called at all unless the body is
requested by the request handlers. So your init will be missed out. But I need
to do more checking, since the logic is not trivial.
the second gets more complex - you need a way to associate the handler()
routine with the init() routine in the handler so you can register the
filter all at once. or maybe you don't if $filter->ctx is somehow
magical, I dunno. all of this is requiring a pretty steep internals
learning curve on my part :)
I was planning to workout the second one if possible.
at any rate, my thought was to prototype the first part and save the
second for later, after we get filter_init working in at least some
fashion.
See above.
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