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MINOR: proxy: Add fe_defbe fetcher

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Patch adds ability to fetch frontend's default backend name in your
logic, so it can be used later to derive other backend names to make routing
decisions.
This commit is contained in:
Marcin Deranek 2018-04-13 14:37:50 +02:00 committed by Willy Tarreau
parent 11ebb2080e
commit 9a66dfbd6c
2 changed files with 21 additions and 0 deletions
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4
doc/configuration.txt
View File

@ -13917,6 +13917,10 @@ fc_reordering(<unit>) : integer
not TCP or if the operating system does not support TCP_INFO, for example
Linux kernels before 2.4, the sample fetch fails.
fe_defbe : string
Returns a string containing the frontend's default backend name. It can be
used in frontends to check which backend will handle requests by default.
fe_id : integer
Returns an integer containing the current frontend's id. It can be used in
backends to check from which frontend it was called, or to stick all users

17
src/frontend.c
View File

@ -194,6 +194,22 @@ smp_fetch_fe_name(const struct arg *args, struct sample *smp, const char *kw, vo
return 1;
}
/* set string to the name of the default backend */
static int
smp_fetch_fe_defbe(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->sess->fe->defbe.be)
return 0;
smp->data.u.str.str = (char *)smp->sess->fe->defbe.be->id;
if (!smp->data.u.str.str)
return 0;
smp->data.type = SMP_T_STR;
smp->flags = SMP_F_CONST;
smp->data.u.str.len = strlen(smp->data.u.str.str);
return 1;
}
/* set temp integer to the number of HTTP requests per second reaching the frontend.
* Accepts exactly 1 argument. Argument is a frontend, other types will cause
* an undefined behaviour.
@ -239,6 +255,7 @@ smp_fetch_fe_conn(const struct arg *args, struct sample *smp, const char *kw, vo
*/
static struct sample_fetch_kw_list smp_kws = {ILH, {
{ "fe_conn", smp_fetch_fe_conn, ARG1(1,FE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "fe_defbe", smp_fetch_fe_defbe, 0, NULL, SMP_T_STR, SMP_USE_FTEND, },
{ "fe_id", smp_fetch_fe_id, 0, NULL, SMP_T_SINT, SMP_USE_FTEND, },
{ "fe_name", smp_fetch_fe_name, 0, NULL, SMP_T_STR, SMP_USE_FTEND, },
{ "fe_req_rate", smp_fetch_fe_req_rate, ARG1(1,FE), NULL, SMP_T_SINT, SMP_USE_INTRN, },