From 11ecb37dd97b3042fd60392def225e92b64f9071 Mon Sep 17 00:00:00 2001
From: Evilham <contact@evilham.com>
Date: Tue, 21 Jun 2022 11:19:11 +0200
Subject: [PATCH] [__jitsi_meet] Add --abort-conference-count parameter

Only has an effect if the prometheus exporter is enabled and if it is not
empty (default).
If at least this many conferences are active on the server, the type will
bail out before making any changes.
This is useful if you want to avoid service disruptions due to e.g. an SLA.

Sponsored by:	camilion.eu
---
 type/__jitsi_meet/explorer/jitsi-status            |  6 ++++++
 type/__jitsi_meet/man.rst                          |  8 ++++++++
 type/__jitsi_meet/manifest                         | 14 ++++++++++++++
 .../parameter/default/abort-conference-count       |  0
 type/__jitsi_meet/parameter/optional               |  1 +
 5 files changed, 29 insertions(+)
 create mode 100755 type/__jitsi_meet/explorer/jitsi-status
 create mode 100644 type/__jitsi_meet/parameter/default/abort-conference-count

diff --git a/type/__jitsi_meet/explorer/jitsi-status b/type/__jitsi_meet/explorer/jitsi-status
new file mode 100755
index 0000000..ce3d9f7
--- /dev/null
+++ b/type/__jitsi_meet/explorer/jitsi-status
@@ -0,0 +1,6 @@
+#!/bin/sh -eu
+
+if [ ! -f "${__object}/parameter/disable-prometheus-exporter" ]; then
+	# TODO: detect curl / depend on it?
+	curl -s localhost:9888/metrics
+fi
diff --git a/type/__jitsi_meet/man.rst b/type/__jitsi_meet/man.rst
index 03a4a35..e69275b 100644
--- a/type/__jitsi_meet/man.rst
+++ b/type/__jitsi_meet/man.rst
@@ -47,6 +47,14 @@ NOTE: This type currently does not deal with setting up coturn.
 
 OPTIONAL PARAMETERS
 -------------------
+abort-conference-count
+    Only has an effect if the prometheus exporter is enabled and if it is not
+    empty (default).
+    If at least this many conferences are active on the server, the type will
+    bail out before making any changes.
+    This is useful if you want to avoid service disruptions due to e.g. an SLA.
+
+
 turn-secret
     The shared secret for the TURN server.
 
diff --git a/type/__jitsi_meet/manifest b/type/__jitsi_meet/manifest
index 20e91a7..78b3524 100755
--- a/type/__jitsi_meet/manifest
+++ b/type/__jitsi_meet/manifest
@@ -10,6 +10,20 @@ case "${os}" in
 	;;
 esac
 
+current_conferences="$(cat "${__object}/explorer/jitsi-status" | grep -E "^jitsi_conferences[[:space:]]" | cut -d ' ' -f 2)"
+
+ABORT_CONFERENCE_COUNT="$(cat "${__object}/parameter/abort-conference-count")"
+
+if [ -n "${current_conferences}" ] && [ -n "${ABORT_CONFERENCE_COUNT}" ] && \
+	[ "${ABORT_CONFERENCE_COUNT}" -le "${current_conferences}" ]; then
+	cat <<-EOF
+Early bail out was requested when at least ${ABORT_CONFERENCE_COUNT} conferences are taking place.
+There are currently ${current_conferences} active conferences.
+
+Try again at a later time or remove or increase --abort-conference-count
+	EOF
+	exit 1
+fi
 
 JITSI_HOST="${__target_host}"
 if [ -f "${__object}/parameter/jitsi-version" ]; then
diff --git a/type/__jitsi_meet/parameter/default/abort-conference-count b/type/__jitsi_meet/parameter/default/abort-conference-count
new file mode 100644
index 0000000..e69de29
diff --git a/type/__jitsi_meet/parameter/optional b/type/__jitsi_meet/parameter/optional
index e7581af..e18bd6a 100644
--- a/type/__jitsi_meet/parameter/optional
+++ b/type/__jitsi_meet/parameter/optional
@@ -1,3 +1,4 @@
+abort-conference-count
 jitsi-version
 turn-secret
 turn-server