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MINOR: proxy: Add fe_name/be_name fetchers next to existing fe_id/be_id

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These 2 patches add ability to fetch frontend/backend name in your
logic, so they can be used later to make routing decisions (fe_name) or
taking some actions based on backend which responded to request (be_name).
In our case we needed a fetcher to be able to extract information we
needed from frontend name.
This commit is contained in:
Marcin Deranek 2016-12-12 14:08:05 +01:00 committed by Willy Tarreau
parent 8e0f17543e
commit d2471c2bdc
3 changed files with 43 additions and 0 deletions
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9
doc/configuration.txt
View File

@ -13089,6 +13089,10 @@ be_id : integer
Returns an integer containing the current backend's id. It can be used in
frontends with responses to check which backend processed the request.
be_name : string
Returns a string containing the current backend's name. It can be used in
frontends with responses to check which backend processed the request.
dst : ip
This is the destination IPv4 address of the connection on the client side,
which is the address the client connected to. It can be useful when running
@ -13181,6 +13185,11 @@ fe_id : integer
backends to check from which backend it was called, or to stick all users
coming via a same frontend to the same server.
fe_name : string
Returns a string containing the current frontend's name. It can be used in
backends to check from which frontend it was called, or to stick all users
coming via a same frontend to the same server.
sc_bytes_in_rate(<ctr>[,<table>]) : integer
sc0_bytes_in_rate([<table>]) : integer
sc1_bytes_in_rate([<table>]) : integer

19
src/backend.c
View File

@ -1681,6 +1681,24 @@ smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void
return 1;
}
/* set string to the name of the backend */
static int
smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->strm)
return 0;
smp->data.u.str.str = (char *)smp->strm->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 id of the server */
static int
smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
@ -1803,6 +1821,7 @@ static struct sample_fetch_kw_list smp_kws = {ILH, {
{ "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
{ "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
{ "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },

15
src/frontend.c
View File

@ -167,6 +167,20 @@ smp_fetch_fe_id(const struct arg *args, struct sample *smp, const char *kw, void
return 1;
}
/* set string to the name of the frontend */
static int
smp_fetch_fe_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->data.u.str.str = (char *)smp->sess->fe->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.
@ -213,6 +227,7 @@ 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_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, },
{ "fe_sess_rate", smp_fetch_fe_sess_rate, ARG1(1,FE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ /* END */ },