When I added commit 16b282f4b ("MINOR: stick-table: show the shard
number in each entry's "show table" output"), I don't know how but
I managed to mess up my reg tests since everything worked fine,
most likely by running it on a binary built in the wrong branch.
Several reg tests include some table outputs that were upset by the
new "shard=" field. This test added them and revealed at the same
time that entries learned over peers are not properly initialized,
which will be fixed in a future series of fixes.
This commit requires previous fix "BUG/MINOR: peers: always
initialize the stksess shard value" so as not to trip on entries
learned from peers.
With the CI occasionally slowing down, we're starting to see again some
spurious failures despite the long 1-second timeouts. This reports false
positives that are disturbing and doesn't provide as much value as this
could. However at this delay it already becomes a pain for developers
to wait for the tests to complete.
This commit adds support for the new environment variable
HAPROXY_TEST_TIMEOUT that will allow anyone to modify the connect,
client and server timeouts. It was set to 5 seconds by default, which
should be plenty for quite some time in the CI. All relevant values
that were 200ms or above were replaced by this one. A few larger
values were left as they are special. One test for the set-timeout
action that used to rely on a fixed 1-sec value was extended to a
fixed 5-sec, as the timeout is normally not reached, but it needs
to be known to compare the old and new values.
Historically we've been counting lots of client-triggered events in stick
tables to help detect misbehaving ones, but we've been missing the same on
the server side, and there's been repeated requests for being able to count
the server errors per URL in order to precisely monitor the quality of
service or even to avoid routing requests to certain dead services, which
is also called "circuit breaking" nowadays.
This commit introduces http_fail_cnt and http_fail_rate, which work like
http_err_cnt and http_err_rate in that they respectively count events and
their frequency, but they only consider server-side issues such as network
errors, unparsable and truncated responses, and 5xx status codes other
than 501 and 505 (since these ones are usually triggered by the client).
Note that retryable errors are purposely not accounted for, so that only
what the client really sees is considered.
With this it becomes very simple to put some protective measures in place
to perform a redirect or return an excuse page when the error rate goes
beyond a certain threshold for a given URL, and give more chances to the
server to recover from this condition. Typically it could look like this
to bypass a URL causing more than 10 requests per second:
stick-table type string len 80 size 4k expire 1m store http_fail_rate(1m)
http-request track-sc0 base # track host+path, ignore query string
http-request return status 503 content-type text/html \
lf-file excuse.html if { sc0_http_fail_rate gt 10 }
A more advanced mechanism using gpt0 could even implement high/low rates
to disable/enable the service.
Reg-test converteers_ref_cnt_never_dec.vtc was updated to test it.
Since commit f92afb732 ("MEDIUM: cfgparse: Emit hard error on truncated lines")
we now produce parsing errors on truncated lines, in an effort to clean
up dangerous or broken config files. And it turns out that one of our own
regression tests was suffering from this, as diagnosed by William and Tim.
The cause is the leading spaces in front of "} -start" that vtest makes
part of the output file, so the file finishes with a partial line made
of spaces.
