tree d2bf83caa62a8e83de1486d1ab3dfbe49829f2c7
parent 260ec8e9a9182a2696df4183ccb1920397d8e528
author Christopher Faulet <cfaulet@haproxy.com> 1619536090 +0200
committer Christopher Faulet <cfaulet@haproxy.com> 1619599868 +0200

BUG/MINOR: applet: Notify the other side if data were consumed by an applet

If an applet consumed output data (the amount of output data has changed
between before and after the call to the applet), the producer is
notified. It means CF_WRITE_PARTIAL and CF_WROTE_DATA are set on the output
channel and the opposite stream interface is notified some room was made in
its input buffer. This way, it is no longer the applet responsibility to
take care of it. However, it doesn't matter if the applet does the same.

Said like that, it looks like an improvement not a bug. But it really fixes
a bug in the lua, for HTTP applets. Indeed, applet:receive() and
applet:getline() are buggy for HTTP applets. Data are consumed but the
producer is not notified. It means if the payload is not fully received in
one time, the applet may be blocked because the producer remains blocked (it
is time dependent).

This patch must be backported as far as 2.0 (only for the HTX part).