Introduced a new sample fetch keyword "fe_exist" that checks if a
frontend with a given name exists.
---
v2: added documentation for the fe_exist converter
doc/configuration.txt | 10 ++++++++++
src/frontend.c | 18 ++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 0c36951d7..6913008ae 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -20971,6 +20971,7 @@ eth.proto
binary integer
eth.src binary binary
eth.vlan binary integer
even integer boolean
+fe_exist string boolean
field(index,delimiters[,count]) string string
fix_is_valid binary boolean
fix_tag_value(tag) binary binary
@@ -21501,6 +21502,15 @@ field(<index>,<delimiters>[,<count>])
str(f1_f2_f3__f5),field(-2,_,3) # f2_f3_
str(f1_f2_f3__f5),field(-3,_,0) # f1_f2_f3
+fe_exist
+ Takes a frontend name as input value and returns a boolean TRUE if the said
+ frontend with that name exists in the current configuration, otherwise
returns
+ FALSE. Can be used in places where checking the existence of a frontend from
a
+ dynamic name is valuable, like map lookups or answering to an external check.
+
+ Example :
+ http-request deny unless { var(txn.fe_name),fe_exist }
+
fix_is_valid
Parses a binary payload and performs sanity checks regarding FIX (Financial
Information eXchange):
diff --git a/src/frontend.c b/src/frontend.c
index 1df11fcb7..2ca788cbf 100644
--- a/src/frontend.c
+++ b/src/frontend.c
@@ -323,6 +323,16 @@ smp_fetch_fe_tarpit_timeout(const struct arg *args, struct
sample *smp, const ch
return 1;
}
+static int
+sample_conv_fe_exist(const struct arg *args, struct sample *smp, void *private)
+{
+ if (!smp_make_safe(smp))
+ return 0;
+
+ smp->data.type = SMP_T_BOOL;
+ smp->data.u.sint = proxy_fe_by_name(smp->data.u.str.area) != NULL;
+ return 1;
+}
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
@@ -341,6 +351,14 @@ static struct sample_fetch_kw_list smp_kws = {ILH, {
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, {
+ { "fe_exist", sample_conv_fe_exist, 0, NULL, SMP_T_STR, SMP_T_BOOL },
+ { /* END */ },
+}};
+
+INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
+
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
--
2.43.0
