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MINOR: backend: srv_is_up converter

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There is currently an srv_queue converter which is capable of taking the
output of a dynamic name and determining the queue length for a given
server.  In addition there is a sample fetcher for whether a server is
currently up.  This simply combines the two such that srv_is_up can be
used as a converter too.

Future work might extend this to other sample fetchers for servers, but
this is probably the most useful for acl routing.
This commit is contained in:
Chris Staite 2025-09-24 22:21:43 +01:00 committed by Willy Tarreau
parent faba98c85f
commit 54f53bc875
2 changed files with 29 additions and 0 deletions
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11
doc/configuration.txt
View File

@ -20144,6 +20144,7 @@ secure_memcmp(var) string boolean
set-var(var[,cond...]) any same
sha1 binary binary
sha2([bits]) binary binary
srv_is_up string boolean
srv_queue string integer
strcmp(var) string boolean
sub(value) integer integer
@ -21405,6 +21406,16 @@ sha2([<bits>])
Please note that this converter is only available when HAProxy has been
compiled with USE_OPENSSL.
srv_is_up
Takes an input value of type string, either a server name or <backend>/<server>
format and returns true when the designated server is currently UP. Can be used
in places where we want to look up a server status from a dynamic name, like a
cookie value (e.g. req.cook(SRVID),srv_is_up) and then make a decision to
direct a request elsewhere. Before using this, please keep in mind that using
this converter on uncontrolled data might allow an external observer to query
the state of any server in the whole configuration, which might possibly not
be acceptable in some environments.
srv_queue
Takes an input value of type string, either a server name or <backend>/<server>
format and returns the number of queued streams on that server. Can be used

18
src/backend.c
View File

@ -3763,6 +3763,23 @@ static struct server *sample_conv_srv(struct sample *smp)
return server_find(px, smp->data.u.str.area);
}
static int
sample_conv_srv_is_up(const struct arg *args, struct sample *smp, void *private)
{
struct server *srv = sample_conv_srv(smp);
if (!srv)
return 0;
smp->data.type = SMP_T_BOOL;
if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
(!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
smp->data.u.sint = 1;
else
smp->data.u.sint = 0;
return 1;
}
static int
sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
{
@ -3809,6 +3826,7 @@ INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
{ "srv_is_up", sample_conv_srv_is_up, 0, NULL, SMP_T_STR, SMP_T_BOOL },
{ "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
{ /* END */ },
}};