jvb: autoscaler sidecar support

jvb/rootfs/etc/cont-init.d/10-config

@@ -35,6 +35,39 @@ if [[ -f /config/custom-sip-communicator.properties ]]; then
     cat /config/custom-sip-communicator.properties > /config/sip-communicator.properties
 fi
 
+# set random jvb nickname for the instance if is not set
+[ -z "${JVB_INSTANCE_ID}" ] && export JVB_INSTANCE_ID="jvb-$(date +%N)"
+
+# check for AUTOSCALER_URL, AUTOSCALER_SIDECAR_KEY_FILE and AUTOSCALER_SIDECAR_KEY_ID as indicator that sidecar should be enabled
+if [ -n "$AUTOSCALER_URL" ]; then
+    if [ -z "$AUTOSCALER_SIDECAR_KEY_FILE" ]; then
+        export AUTOSCALER_SIDECAR_KEY_FILE="/etc/jitsi/autoscaler-sidecar/asap.pem"
+    fi
+    if [ -z "$AUTOSCALER_SIDECAR_KEY_ID" ]; then
+        # assume key id is equal to the base real path of the key file minus .pem
+        export AUTOSCALER_SIDECAR_KEY_ID="$(basename "$(realpath "$AUTOSCALER_SIDECAR_KEY_FILE")" | tr -d '.pem')"
+    fi
+
+    if [ -f "$AUTOSCALER_SIDECAR_KEY_FILE" ]; then
+        echo "AUTOSCALER_URL found, enabling autoscaler sidecar"
+
+        export JVB_VERSION="dpkg -s jitsi-videobridge2 | grep Version | awk '{print $2}' | sed 's/..$//'"
+
+        [ -z "$AUTOSCALER_SIDECAR_PORT" ] && export AUTOSCALER_SIDECAR_PORT="6000"
+        [ -z "$JIBRI_WEBHOOK_SUBSCRIBERS" ] && export JIBRI_WEBHOOK_SUBSCRIBERS="http://localhost:$AUTOSCALER_SIDECAR_PORT/hook"
+        [ -z "$AUTOSCALER_SIDECAR_INSTANCE_ID" ] && export AUTOSCALER_SIDECAR_INSTANCE_ID="$JVB_INSTANCE_ID"
+        [ -z "$AUTOSCALER_SIDECAR_REGION" ] && export AUTOSCALER_SIDECAR_REGION="docker"
+        [ -z "$AUTOSCALER_SIDECAR_GROUP_NAME" ] && export AUTOSCALER_SIDECAR_GROUP_NAME="docker-jvb"
+
+        mkdir -p /etc/jitsi/autoscaler-sidecar
+        tpl /defaults/autoscaler-sidecar.config > /etc/jitsi/autoscaler-sidecar/config
+    else
+        echo "No key file at $AUTOSCALER_SIDECAR_KEY_FILE, leaving autoscaler sidecar disabled"
+    fi
+else
+    echo "No AUTOSCALER_URL defined, leaving autoscaler sidecar disabled"
+fi
+
 tpl /defaults/logging.properties > /config/logging.properties
 tpl /defaults/jvb.conf > /config/jvb.conf
 

jvb/rootfs/etc/services.d/50-autoscaler-sidecar/run

@@ -0,0 +1,10 @@
+#!/usr/bin/with-contenv bash
+
+if [[ -n "$AUTOSCALER_URL" ]] && [[ -f "/etc/jitsi/autoscaler-sidecar/config" ]]; then
+    DAEMON="/usr/bin/node /usr/share/jitsi-autoscaler-sidecar/app.js"
+    exec s6-setuidgid autoscaler-sidecar /bin/bash -c ". /etc/jitsi/autoscaler-sidecar/config && exec $DAEMON"
+else
+    # if autoscaler-sidecar should not be started,
+    # prevent s6 from restarting this script again and again
+    s6-svc -O /var/run/s6/services/50-autoscaler-sidecar
+fi