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#!/bin/bash
# Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this code except in compliance
# with the License. You may obtain a copy of the License
# at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
# NAME
# list_masters - loop through the nodes in the cluster, using pgwget to determine if any are a master.
CDF=/opt/app/cdf
if [ -d /opt/app/postgresql-9.5.2 ]
then PGDIR=/opt/app/postgresql-9.5.2
elif [ -d /usr/lib/postgresql/9.6 ]
then PGDIR=/usr/lib/postgresql/9.6
elif [ -d /usr/lib/postgresql/9.5 ]
then PGDIR=/usr/lib/postgresql/9.5
else echo PostgreSQL bin directory not found 1>&2; exit 1
fi
PATH=$PGDIR/bin:$CDF/bin:/opt/app/pgaas/bin:$PATH
usage()
{
exec 1>&2
[ $# -gt 0 ] && echo "$@"
echo "Usage: $0 [-r] [-v]"
echo -e " -r check /ro instead of /rw"
echo -e " -v verbose"
exit 1
}
VERBOSE=false
CMD=rw
QUIET=--quiet
OUTPUT=-O/dev/null
while getopts rvQ c
do
case "$c" in
r ) CMD=ro ;;
Q ) QUIET= OUTPUT= ;;
v ) VERBOSE=: ;;
\?) usage ;;
esac
done
shift $(($OPTIND - 1))
# loop through the nodes in the cluster, using pgwget to determine if any are a master. Save in $@
for i in $(getpropvalue -n pgnodes | sed 's/|/ /g')
do
$VERBOSE && echo "Checking $i"
if pgwget $QUIET $OUTPUT http://$i:8000/$CMD
then set -- "$@" $i
fi
done
echo "$@"
case "$CMD" in
rw )
case $# in
1 ) exit 0 ;; # one master exists and is running
0 ) exit 1 ;; # no masters exist
* ) exit 2 ;; # more than one master exist
esac
;;
ro )
case $# in
0 ) exit 1 ;; # no masters exist
* ) exit 0 ;; # one or more masters+secondaries exist
esac
;;
esac
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