MINOR: vars: Add vars_set_by_name_ifexist function
This function, unsurprisingly, sets a variable value only if it already
exists. In other words, this function will succeed only if the variable was
found somewhere in the configuration during HAProxy startup.
It will be used by SPOE filter. So an agent will be able to set a value only for
existing variables. This prevents an agent to create a very large number of
unused variables to flood HAProxy and exhaust the memory reserved to variables..
diff --git a/include/proto/vars.h b/include/proto/vars.h
index de0987d..8414baa 100644
--- a/include/proto/vars.h
+++ b/include/proto/vars.h
@@ -7,6 +7,7 @@
void vars_prune(struct vars *vars, struct session *sess, struct stream *strm);
void vars_prune_per_sess(struct vars *vars);
int vars_get_by_name(const char *name, size_t len, struct sample *smp);
+void vars_set_by_name_ifexist(const char *name, size_t len, struct sample *smp);
void vars_set_by_name(const char *name, size_t len, struct sample *smp);
int vars_get_by_desc(const struct var_desc *var_desc, struct sample *smp);
int vars_check_arg(struct arg *arg, char **err);