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  1. Jul 05, 2018
    • Yann Ylavic's avatar
      Merge r1833875 from trunk: · 31878ee9
      Yann Ylavic authored 
      mod_ratelimit: fix behavior with proxied content

mod_ratelimit works by splitting data in "chunks"
to send to the client, sleeping a predefined amount
of time between them (200ms). So for example,
a rate-limit 40 value would correspond to a chunk size
of 8192 bytes, flushed to the client every 200ms.

The idea works fine when httpd directly serves the
content, since the filter will be called once with
a single bucket brigade. In the context of a proxied
content though the filter is likely to be called multiple
times, with a bucket brigade size that corresponds to
the maximum allowed buffer size. If this value is lower
or higher than the chunk size, the filter will not
properly rate limit the data going to the client.

This patch solves the problem with two fix:
1) do_sleep is now stored in the ctx context struct,
   so if the filter is invoked multiple times it
   will still sleep when needed. For example, say
   that the chunk_size is 8192 and the bucket brigate
   len is 10240: the filter will flush 8192 bytes
   on the first invocation, sleep 200ms, flush the
   remaining bytes and then finish. The next invocation
   will do the same, clearly not leading to the
   correct "sleeping pattern".
2) The example above highlights also another issue:
   mod_ratelimit should  flush only chunk_size bytes
   at the time (I am now excluding the burst calculation
   from the picture), and buffer between invocations
   unless the brigade contains EOS.

The change has been tested with various scenarios and
it looks working as expected, but of course more
feedback/testing is welcome.

The original patch was written by me and then Yann
refactored the code to be more precise and efficient,
basically transforming an axe in a wonderful Japanese
katana sword, so credits to him for this work.

PR: 62362


Submitted by: elukey
Reviewed by: elukey, jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1835168 13f79535-47bb-0310-9956-ffa450edef68
      31878ee9
    • Lucien Gentis's avatar
      XML updates. · 70f11557
      Lucien Gentis authored 
      
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      70f11557
    • Yann Ylavic's avatar
      Vote, promote. · 474a7a50
      Yann Ylavic authored 
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      474a7a50
    • Ruediger Pluem's avatar
      * Vote · 6a3596b3
      Ruediger Pluem authored 
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      6a3596b3
    • Eric Covener's avatar
      vi for dummies · acd60fb9
      Eric Covener authored 
      

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      acd60fb9
    • Eric Covener's avatar
      unset ap_server_conf · 84da1ad7
      Eric Covener authored 
      

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      84da1ad7
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