From a65f682cc59b0adc0481466b158fbf6252d96dd7 Mon Sep 17 00:00:00 2001
From: Sander Backus <info@sanbax.com>
Date: Wed, 23 Nov 2022 16:02:42 +0100
Subject: [PATCH] check wsrep_cluster_status (for WSREP not prepared for
 application use)

---
 clustercheck | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/clustercheck b/clustercheck
index 7098a14..4b36b5a 100755
--- a/clustercheck
+++ b/clustercheck
@@ -63,6 +63,22 @@ fi
 #
 WSREP_STATUS=$($MYSQL_CMDLINE -e "SHOW STATUS LIKE 'wsrep_local_state';" \
     2>${ERR_FILE} | tail -1 2>>${ERR_FILE})
+WSREP_CLUSTER_STATUS=$($MYSQL_CMDLINE -e "SHOW STATUS LIKE 'wsrep_cluster_status';" \
+    2>${ERR_FILE} | tail -1 2>>${ERR_FILE})
+
+if [[ "${WSREP_CLUSTER_STATUS}" != "Primary" ]]
+then
+    # Percona XtraDB Cluster node local state is not 'Synced' => return HTTP 503
+    # Shell return-code is 1
+    echo -en "HTTP/1.1 503 Service Unavailable\r\n"
+    echo -en "Content-Type: text/plain\r\n"
+    echo -en "Connection: close\r\n"
+    echo -en "Content-Length: 44\r\n"
+    echo -en "\r\n"
+    echo -en "Percona XtraDB Cluster status Non primary.\r\n"
+    sleep 0.1
+	exit 1;
+fi
 
 if [[ "${WSREP_STATUS}" == "4" ]] || [[ "${WSREP_STATUS}" == "2" && ${AVAILABLE_WHEN_DONOR} == 1 ]]
 then