srv: implement gunicorn wsgi

This patch implements the Gunicorn WSGI server.

Signed-off-by: Amy Parker <amy@amyip.net>

requirements.txt

@@ -3,4 +3,5 @@ mysql-connector-python
 ping3
 requests
 psycopg2
-pyopenssl
+pyopenssl
+gunicorn

srv/gunicorn.sh

@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# 
+# ssvp: server statistics viewer project
+# Copyright (C) 2023 Amy Parker <amy@amyip.net>
+# 
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Affero General Public License for more details.
+# 
+# You should have received a copy of the GNU Affero General Public License
+# along with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA or visit the
+# GNU Project at https://gnu.org/licenses. The GNU Affero General Public
+# License version 3 is available at, for your convenience,
+# https://www.gnu.org/licenses/agpl-3.0.en.html.
+
+which jq
+if [ $? -ne 0 ]; then
+    echo "jq not found"
+    exit 1
+fi
+
+set -e
+
+cd "$(dirname "$0")"
+
+SSL=$(jq -j .ssl ssvp-config.json)
+PORT=$(jq -j .port ssvp-config.json)
+
+if [ $PORT == "null" ]; then
+    if [ $SSL != "null" ]; then
+        PORT=443
+    else
+        PORT=80
+    fi
+fi
+
+if [ $(jq -j .enable_host_ipv6 ssvp-config.json) != "true" ]; then
+    BINDADDR="0.0.0.0:$PORT"
+else
+    BINDADDR="[::]:$PORT"
+fi
+
+gunicorn -w $(( $(nproc) * 2 )) 'app:app' -b $BINDADDR