Merge pull request #116 from lucferbux/feature/readiness-probe

Added readiness probe script

readinessProbe.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+function is_container_running() {
+    [ $(curl -s -o /dev/null -w ''%{http_code}'' localhost:8081) == "302" ]
+};
+
+function is_leader_election_ready() {
+    [ $(curl -s -o /dev/null -w ''%{http_code}'' localhost:4040) == "200" ]
+}
+
+function get_leader() {
+    echo "$(curl http://localhost:4040 2> /dev/null | python3 -c "import sys, json; print(json.load(sys.stdin)['name'])")"
+}
+
+function get_pod_name() {
+    echo ${HOSTNAME}
+}
+
+function is_container_leader() {
+    [ "$(get_leader)" == "$(get_pod_name)" ]
+};
+
+if ! is_leader_election_ready; then
+    # Leader election is not ready yet
+    exit 0
+fi
+
+if ! is_container_running; then
+    # Pod is waiting to become leader
+    exit 0
+elif is_container_leader; then
+    # Pod is the leader
+    exit 0
+else
+    # Pod is still running but it is not the leader
+    exit 1
+fi