Support lz4 and gzip

[aklyuk]

Hello. I build docker image from last version carbon-c-relay 3.7.4
I get error:

[2023-11-21 16:21:58] starting carbon-c-relay v3.7.4 (2022-02-13), pid=1
[2023-11-21 16:21:58] /etc/carbon-c-relay/carbon-c-relay.conf:2:26: feature gzip not compiled in
[2023-11-21 16:21:58]   type linemode transport gzip
[2023-11-21 16:21:58]                           ^^^^
[2023-11-21 16:21:58] failed to read configuration '/etc/carbon-c-relay/carbon-c-relay.conf'

On this line i add --with-gzip:
./configure --disable-maintainer-mode --with-gzip && make
but get error

checking for gzopen in -lz_missing_header... no
configure: error: in `/opt/carbon-c-relay-build':
configure: error: --with-gzip was given, but test for gzip failed

How to compile gzip or lz4 support?

[grobian]

you need zlib-devel or something similar, such that the configure script can find it

[aklyuk]

Thank.
Finally RUN incruction looks like:

RUN \
  apk add --no-cache build-base zlib-dev lz4-dev && \
  touch conffile.tab.c conffile.tab.h conffile.yy.c \
  configure.ac Makefile.am aclocal.m4 configure \
  Makefile.in config.h.in && \
  ./configure --disable-maintainer-mode --with-gzip --with-lz4 && make

But i get error:
/etc/carbon-c-relay/carbon-c-relay.conf:13:0: cannot use UDP transport for compressed/encrypted stream

It is true, carbon-c-relay don't work with inbound compressed udp?

my config is:

listen
  type linemode transport gzip
    127.0.0.1:2003 proto udp
  ;

[grobian]

compression is done in streams, if you lose one packet, you'd not be able to do anything, same for encryption, hence the requirement for TCP

[aklyuk]

compressed tcp is working.
But, i get this message:
buffer overflow during read of gzip stream

carbon-c-relay is running in docker.
I have increased sysctl's parameters - net.ipv4.tcp_rmem, net.core.rmem_max to 1Gb, but no changes.
I have build docker-image with it ENTRYPOINT instruction -
ENTRYPOINT ["/usr/bin/carbon-c-relay", "-f", "/etc/carbon-c-relay/carbon-c-relay.conf", "-U", "268435456"] - no changes.

What can i do?

[grobian]

hmmm, who is generating/sending the gzipped stream?

[aklyuk]

sending is carbon-c-relay v3.3
receiving is carbon-c-relay v.3.7.4