jigasi: autoscaler sidecar support (#1738)

* jigasi: autoscaler sidecar support

* jigasi: remove local address

jigasi/Dockerfile

@@ -11,7 +11,7 @@ LABEL org.opencontainers.image.documentation="https://jitsi.github.io/handbook/"
 ENV GOOGLE_APPLICATION_CREDENTIALS /config/key.json
 
 RUN apt-dpkg-wrap apt-get update && \
-    apt-dpkg-wrap apt-get install -y jigasi jq && \
+    apt-dpkg-wrap apt-get install -y jigasi jq jitsi-autoscaler-sidecar && \
     apt-cleanup
 
 COPY rootfs/ /

jigasi/rootfs/defaults/autoscaler-sidecar.config

@@ -0,0 +1,18 @@
+{{ $SHUTDOWN_POLLING_INTERVAL := .Env.AUTOSCALER_SIDECAR_SHUTDOWN_POLLING_INTERVAL | default "60" -}}
+{{ $STATS_POLLING_INTERVAL := .Env.AUTOSCALER_SIDECAR_STATS_POLLING_INTERVAL | default "30" -}}
+{{ $JIGASI_STATS_PORT := .Env.JIGASI_STATS_PORT | default "8788" -}}
+export SHUTDOWN_POLLING_INTERVAL={{ $SHUTDOWN_POLLING_INTERVAL }}
+export STATS_POLLING_INTERVAL={{ $STATS_POLLING_INTERVAL }}
+export PORT={{ .Env.AUTOSCALER_SIDECAR_PORT }}
+export GRACEFUL_SHUTDOWN_SCRIPT="/usr/share/jigasi/graceful_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"
+export STATS_RETRIEVE_URL="http://localhost:{{ $JIGASI_STATS_PORT }}/about/stats"
+export STATS_REPORT_URL="{{ .Env.AUTOSCALER_URL }}/sidecar/stats"
+export ASAP_SIGNING_KEY_FILE="{{ .Env.AUTOSCALER_SIDECAR_KEY_FILE }}"
+export ASAP_JWT_KID="{{ .Env.AUTOSCALER_SIDECAR_KEY_ID }}"
+export INSTANCE_TYPE="jigasi"
+export INSTANCE_ID="{{ .Env.AUTOSCALER_SIDECAR_INSTANCE_ID }}"
+export INSTANCE_METADATA='{"environment":"{{ .Env.XMPP_ENV_NAME }}","region":"{{ .Env.AUTOSCALER_SIDECAR_REGION }}","group":"{{ .Env.AUTOSCALER_SIDECAR_GROUP_NAME }}","name":"{{ .Env.JIGASI_INSTANCE_ID }}","version":"{{ .Env.JIGASI_VERSION }}","privateIp":"{{ .Env.LOCAL_ADDRESS }}","hostId":"{{ .Env.AUTOSCALER_SIDECAR_HOST_ID }}"}'

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

@@ -13,6 +13,38 @@ if [[ "$JIGASI_XMPP_PASSWORD" == "$OLD_JIGASI_XMPP_PASSWORD" ]]; then
     exit 1
 fi
 
+# set random jigasi nickname for the instance if is not set
+[ -z "${JIGASI_INSTANCE_ID}" ] && export JIGASI_INSTANCE_ID="jigasi-$(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 "$AUTOSCALER_SIDECAR_KEY_FILE" ]; then
+        echo "AUTOSCALER_URL found, enabling autoscaler sidecar"
+
+        export JIGASI_VERSION="$(dpkg -s jigasi | grep Version | awk '{print $2}' | sed 's/..$//')"
+
+        [ -z "$AUTOSCALER_SIDECAR_PORT" ] && export AUTOSCALER_SIDECAR_PORT="6000"
+        [ -z "$AUTOSCALER_SIDECAR_INSTANCE_ID" ] && export AUTOSCALER_SIDECAR_INSTANCE_ID="$JIGASI_INSTANCE_ID"
+        [ -z "$AUTOSCALER_SIDECAR_REGION" ] && export AUTOSCALER_SIDECAR_REGION="docker"
+        [ -z "$AUTOSCALER_SIDECAR_GROUP_NAME" ] && export AUTOSCALER_SIDECAR_GROUP_NAME="docker-jigasi"
+
+        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/sip-communicator.properties > /config/sip-communicator.properties
 

jigasi/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

jigasi/rootfs/etc/services.d/jigasi/run

@@ -5,4 +5,7 @@ JAVA_SYS_PROPS="-Djava.util.logging.config.file=/config/logging.properties"
 DAEMON=/usr/share/jigasi/jigasi.sh
 DAEMON_OPTS="--nocomponent=true --configdir=/ --configdirname=config --min-port=${JIGASI_PORT_MIN:-20000} --max-port=${JIGASI_PORT_MAX:-20050}"
 
-exec s6-setuidgid jigasi /bin/bash -c "JAVA_SYS_PROPS=\"$JAVA_SYS_PROPS\" exec $DAEMON $DAEMON_OPTS"
+JIGASI_CMD="JAVA_SYS_PROPS=\"$JAVA_SYS_PROPS\" exec $DAEMON $DAEMON_OPTS"
+[ -n "$JIGASI_LOG_FILE" ] && JIGASI_CMD="$JIGASI_CMD 2>&1 | tee $JIGASI_LOG_FILE"
+
+exec s6-setuidgid jigasi /bin/bash -c "$JIGASI_CMD"