jibri: adds autoscaler sidecar hook to signal final shutdown (#1810)

jibri/rootfs/defaults/autoscaler-sidecar.config

@@ -5,7 +5,7 @@ export SHUTDOWN_POLLING_INTERVAL={{ $SHUTDOWN_POLLING_INTERVAL }}
 export STATS_POLLING_INTERVAL={{ $STATS_POLLING_INTERVAL }}
 export PORT={{ .Env.AUTOSCALER_SIDECAR_PORT }}
 export GRACEFUL_SHUTDOWN_SCRIPT="/opt/jitsi/jibri/wait_graceful_shutdown.sh"
-export TERMINATE_SCRIPT="/opt/jitsi/jibri/shutdown.sh"
+export TERMINATE_SCRIPT="/opt/jitsi/shutdown.sh"
 export ENABLE_REPORT_STATS=true
 export POLLING_URL="{{ .Env.AUTOSCALER_URL  }}/sidecar/poll"
 export STATUS_URL="{{ .Env.AUTOSCALER_URL }}/sidecar/status"

jibri/rootfs/opt/jitsi/shutdown.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/with-contenv bash
+# notify the sidecar of imminent shutdown
+PORT=${AUTOSCALER_SIDECAR_PORT:-6000}
+curl -d '{}' -v 0:$PORT/hook/v1/shutdown
+sleep 10
+
+# signal jibri to shutdown via rest api
+/opt/jitsi/jibri/shutdown.sh
+
+# shutdown everything else
+s6-svscanctl -t /var/run/s6/services