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HAProxy - Load balancer
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Willy Tarreau 633c41c621 MEDIUM: mux-h2: rework h2_restart_reading() to differentiate recv and demux 
From the beginning, h2_restart_reading() has always been confusing because
it decides whether or not to wake the tasklet handler up or not. This
tasklet handler does two things, one is receiving from the socket to the
demux buf, and one is demuxing from the demux buf to the streams' rxbufs.

The conditions are governed by h2_recv_allowed(), which is also called at
a few places to decide whether or not to actually receive from the socket.
It starts to be visible that this leaves some difficulties regarding what
to do with possibly pending data.

In 2.0 with commit 3ca18bf0b ("BUG/MEDIUM: h2: Don't attempt to recv from
h2_process_demux if we subscribed."), we even had to address a special
case where it was possibly to endlessly wake up because the conditions
would rely on the demux buffer's contents, though the solution consisted
in passing a flag to decide whether or not to consider the buffer's
contents.

In 2.5 commit b5f7b5296 ("BUG/MEDIUM: mux-h2: Handle remaining read0 cases
on partial frames") introduced a new flag H2_CF_DEM_SHORT_READ which
indicates that the demux had to stop in the middle of a frame and cannot
make progress without more data. More adaptations later came in based on
this but this actually reflected exactly what was needed to solve this
painful situation: a state indicating whether to receive or parse.

Now's about time to definitely address this by reworking h2_restart_reading()
to check two completely independent things:
  - the ability to receive more data into the demux buffer, which is
    based on its allocation/fill state and the socket's errors
  - the ability to demux such data, which is based on the presence of
    enough data (i.e. no stuck short read), and ability to find an rx
    buf to continue the processing.

Now the conditions are much more understandable, and it's also visible
that the consider_buffer argument, whose value was not trivial for
callers, is not used anymore.

Tests stacking two layers of H2 show strictly no change to the wakeup
cause distributions nor counts.
2024-10-12 16:38:36 +02:00
.github CI: QUIC Interop: use different artifact names for uploading logs 2024-08-26 11:19:41 +02:00
addons BUG/MEDIUM: promex: Wait to have the request before sending the response 2024-09-16 22:56:28 +02:00
admin CLEANUP: assorted typo fixes in the code and comments 2024-09-03 17:49:21 +02:00
dev DEV: flags/applet: decode appctx flags 2024-09-24 18:26:36 +02:00
doc DOC: design-thoughts: add diagrams illustrating an rx win groth 2024-10-12 16:38:36 +02:00
examples MEDIUM: protocol: add MPTCP per address support 2024-08-30 18:53:49 +02:00
include MAJOR: mux-h2: make streams use the connection's buffers 2024-10-12 16:29:16 +02:00
reg-tests REGTESTS: add some tests for 'do-log' action 2024-10-04 21:38:19 +02:00
scripts SCRIPTS: create-release: no more need to skip architecture.txt 2024-07-10 15:38:45 +02:00
src MEDIUM: mux-h2: rework h2_restart_reading() to differentiate recv and demux 2024-10-12 16:38:36 +02:00
tests MAJOR: import: update mt_list to support exponential back-off (try #2) 2024-07-09 16:46:38 +02:00
.cirrus.yml CI: FreeBSD: upgrade image, packages 2024-06-04 11:19:00 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore CONTRIB: Add vi file extensions to .gitignore 2023-06-02 18:14:34 +02:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml CI: travis-ci: temporarily disable arm64 builds 2021-08-07 07:28:15 +02:00
BRANCHES DOC: fix some spelling issues over multiple files 2021-01-08 14:53:47 +01:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.1-dev9 2024-10-03 17:47:33 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL DOC: install: don't reference removed CPU arg 2024-07-16 20:06:06 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile REORG: buffers: move some of the heavy functions from buf.h to buf.c 2024-10-12 16:29:15 +02:00
README.md DOC: change the link to the FreeBSD CI in README.md 2024-06-03 15:21:29 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.1-dev9 2024-10-03 17:47:33 +02:00
VERSION [RELEASE] Released version 3.1-dev9 2024-10-03 17:47:33 +02:00

README.md

HAProxy

alpine/musl AWS-LC openssl no-deprecated Illumos NetBSD FreeBSD VTest

HAProxy logo

HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

Installation

The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.

Getting help

The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.

The issue tracker is only for bug reports or feature requests.

Documentation

The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.

Please refer to the following files depending on what you're looking for:

  • INSTALL for instructions on how to build and install HAProxy
  • BRANCHES to understand the project's life cycle and what version to use
  • LICENSE for the project's license
  • CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory:

License

HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.