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From Ben Laurie <...@algroup.co.uk>
Subject Re: Is Apache Proxy Half-Duplex?
Date Fri, 24 May 2002 18:20:34 GMT
Ryan Bloom wrote:
>>From: minfrin@localhost.localdomain
> 
> [mailto:minfrin@localhost.localdomain]
> 
>>Bill Stoddard wrote:
>>
>>
>>>This is a variation of the problem Aaron and I were interested in
>>
> with
> 
>>CGI scripts (and
>>
>>>directly related to an open PR against 2.0.36).  Unfortunately, I
>>
> think
> 
>>filters need some
>>
>>>more work to make this possible. As Will said, we need to be able to
>>
>>poll/select on both
>>
>>>the frontend and backend descriptors and do the right thing. I may
>>
> be
> 
>>mistaken but I
>>
>>>thought the proxy in 1.3 handled this correctly...
>>
>>The v1.3 proxy was always read request then read response, it never
> 
> did
> 
>>these two simultaneously.
>>
>>Would the changes to the filters be that drastic? We would in theory
>>just have to poll for incoming data (in either direction), then read
>>bridages from the relevant filter stack...? No...?
> 
> 
> I tried to think through how to do this back in November, when I last
> touched the proxy.  The easiest way to do this, is to add a new read
> mode to  input filters, APR_READ_POLL.  Each filter would be responsible
> for returning any data that it has if called in this mode.  If none of
> the filters in the stack have any data, then the filter that has the
> socket must return the socket bucket, but it is allowed to keep a copy
> of the socket itself.  The filter_poll call can then use apr_poll to
> determine which of the sockets have any data.  This wouldn't be the
> cleanest code, but it should work.

Seems to me that you really want a apr_poll equivalent that works on 
bucket brigades - that would make this clean, and could be quite elegant 
(IMO).

Cheers,

Ben.

-- 
http://www.apache-ssl.org/ben.html       http://www.thebunker.net/

"There is no limit to what a man can do or how far he can go if he
doesn't mind who gets the credit." - Robert Woodruff


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