tree a5c284f35ad7ea9741ba2fcece0860569d763e1b
parent b9f9e3bc171e505a344ca0e652e0eac7d6b18f37
author William Lallemand <wlallemand@haproxy.com> 1540558060 +0200
committer Willy Tarreau <w@1wt.eu> 1540731786 +0100
encoding latin1

MEDIUM: cli: implement 'mode cli' proxy analyzers

This patch implements analysers for parsing the CLI and extra features
for the master's CLI.

For each command (sent alone, or separated by ; or \n) the request
analyser will determine to which server it should send the request.

The 'mode cli' proxy is able to parse a prefix for each command which is
used to select the apropriate server. The prefix start by @ and is
followed by "master", the PID preceded by ! or the relative PID. (e.g.
@master, @1, @!1234). The servers are not round-robined anymore.

The command is sent with a SHUTW which force the server to close the
connection after sending its response. However the proxy allows a
keepalive connection on the client side and does not close.

The response analyser does not do much stuff, it only reinits the
connection when it received a close from the server, and forward the
response. It does not analyze the response data.
The only guarantee of the end of the response is the close of the
server, we can't rely on the double \n since it's not send by every
command.

This could be reimplemented later as a filter.