[MINOR] acl: add srv_is_up() to check that a specific server is up or not
This ACL was missing in complex setups where the status of a remote site
has to be considered in switching decisions. Until there, using a server's
status in an ACL required to have a dedicated backend, which is a bit heavy
when multiple servers have to be monitored.
diff --git a/src/backend.c b/src/backend.c
index ffd3bca..6f1eefe 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -1232,6 +1232,24 @@
return 1;
}
+/* report in test->flags a success or failure depending on the designated
+ * server's state. There is no match function involved since there's no pattern.
+ */
+static int
+acl_fetch_srv_is_up(struct proxy *px, struct session *l4, void *l7, int dir,
+ struct acl_expr *expr, struct acl_test *test)
+{
+ struct server *srv = expr->arg.srv;
+
+ test->flags = ACL_TEST_F_VOL_TEST;
+ if (!(srv->state & SRV_MAINTAIN) &&
+ (!(srv->state & SRV_CHECKED) || (srv->state & SRV_RUNNING)))
+ test->flags |= ACL_TEST_F_SET_RES_PASS;
+ else
+ test->flags |= ACL_TEST_F_SET_RES_FAIL;
+ return 1;
+}
+
/* set test->i to the number of enabled servers on the proxy */
static int
acl_fetch_connslots(struct proxy *px, struct session *l4, void *l7, int dir,
@@ -1410,6 +1428,7 @@
{ "be_conn", acl_parse_int, acl_fetch_be_conn, acl_match_int, ACL_USE_NOTHING },
{ "queue", acl_parse_int, acl_fetch_queue_size, acl_match_int, ACL_USE_NOTHING },
{ "avg_queue", acl_parse_int, acl_fetch_avg_queue_size, acl_match_int, ACL_USE_NOTHING },
+ { "srv_is_up", acl_parse_nothing, acl_fetch_srv_is_up, acl_match_nothing, ACL_USE_NOTHING },
{ NULL, NULL, NULL, NULL },
}};