tree 918e715fe718633d772802ba52b000c7f1f97b66
parent 2da6b8c94f7ef7d99d27de1815fd3568b350aaaf
author Ed Tanous <edtanous@google.com> 1645507986 -0800
committer Ed Tanous <ed@tanous.net> 1679519343 +0000

nbd proxy and websocket cleanups

As-written, the nbd (and all websocket daemons) suffer from a problem
where there is no way to apply socket backpressure, so in certain
conditions, it's trivial to run the BMC out of memory on a given
message.  This is a problem.

This commit implements the idea of an incremental callback handler, that
accepts a callback function to be run when the processing of the message
is complete.  This allows applying backpressure on the socket, which in
turn, should provide pressure back to the client, and prevent buffering
crashes on slow connections, or connections with high latency.

Tested: NBD proxy not upstream, no way to test.  No changes made to
normal websocket flow.

Signed-off-by: Michal Orzel <michalx.orzel@intel.com>
Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I3f116cc91eeadc949579deacbeb2d9f5e0f4fa53