select, poll and epoll now have their dedicated functions and have
been split into distinct files. Several FD manipulation primitives
have been provided with each poller.
The rest of the code needs to be cleaned to remove traces of
StaticReadEvent/StaticWriteEvent. A trick involving a macro has
temporarily been used right now. Some work needs to be done to
factorize tests and sets everywhere.
Before calling http_parse_{sts,req}line(), it is necessary
to make msg->sol point to the beginning of the line. This
was not done, resulting in the proxy sometimes crashing when
URI rewriting or result rewriting was used.
logs are handled better with dedicated functions. The HTTP implementation
moved to proto_http.c. It has been cleaned up a bit. Now a frontend with
option httplog and no log will not call the function anymore.
The fiprm and beprm were added to ease the transition between
a single listener mode to frontends+backends. They are no longer
needed and make the code a bit more complicated. Remove them.
Patch from Fabrice Dulaunoy. Explanation below, and script
merged in examples/.
This patch allow to put a different address in the check part for each
server (and not only a specific port)
I need this feature because I've a complex settings where, when a specific
farm goes down, I need to switch a set of other farm either if these other
farm behave perfectly well.
For that purpose, I've made a small PERL daemon with some REGEX or PORT
test which allow me to test a bunch of thing.
Patch from Bryan Germann for 1.2.17.
In some circumstances, it is useful not to add the X-Forwarded-For
header, for instance when the client is another reverse-proxy or
stunnel running on the same machine and which already adds it. This
patch adds the "except" keyword to the "forwardfor" option, allowing
to specify an address or network which will not be added to this
header.
Patch from Marcus Rueckert for 1.2.17 :
"I added the attached patch to haproxy. I don't have a static uid/gid for
haproxy so i need to specify the username/groupname to run it as non
root user."
Previously, use of the "usesrc" keyword could silently fail if
either the module was not loaded, or the user did not have enough
permissions. Now the errors are better diagnosed and more appropriate
advices are given.
It was difficult to find how to enter the "usesrc" keyword. Now the
configuration checker is a bit more friendly and tries to identify
most mistakes and gives some hints back.
Generally, if a recv() returns less bytes than the MSS, it means that
there is nothing left in the system's buffers, and that it's not worth
trying to read again because we are very likely to get nothing. A
default read low limit has been set to 1460 bytes below which we stop
reading.
This has brought a little speed boost on small objects while maintaining
the same speed on large objects.
Multiple read polling was temporarily disabled, which had the side
effect of burning huge amounts of CPU on large objects. It has now
been re-implemented with a limit of 8 calls per wake-up, which seems
to provide best results at least on Linux.
Very recent changes consisting in moving some pointers to the
transaction instead of the session have lead to a bug because
those pointers were only initialized if the protocol was HTTP,
but they were freed based on their value. In some cases, it
was possible to cause double frees.
HTTP header matching is now made easier with http_header_match2().
Various locations have been adapted to use it. A small bug was also
fixed causing empty headers to be matched till next one.
Two new functions http_header_add_tail() and http_header_add_tail2()
make it easier to append headers, and also reduce the number of
sprintf() calls and perform stricter checks.
Some session flags were clearly related to HTTP transactions.
A new 'flags' field has been added to http_txn, and the
associated flags moved to proto_http.h.
Now the response is correctly processed in the backend first
then in the frontend. It has followed intensive tests to
catch regressions, and everything seems OK now, but the code
is young anyway.
Both request and response captures will have to parse headers following
the same methods. It's better to factorize the code, hence the new
capture_headers() function.
Some parts of HTTP processing were incorrectly called "request" while
they are messages or transactions. The following structure members
have changed :
http_msg.hdr_state => msg_state
http_msg.sor => som
http_req.req_state => removed
http_req => http_txn
The new rbtree-based scheduler makes heavy use of tv_cmp2(), and
this function becomes a huge CPU eater. Refine it a little bit in
order to slightly reduce CPU usage.
