is_server_up.sh

#!/bin/bash
# Test whether the Zanata server is up.
# Author: dchen@redhat.com

function print_usage(){
    cat << END
Usage: $0 [-i interval] [-r retries] [-p up_pattern] [-v verboseLevel] <ZANATA_SERVER_URL>
       $0 -h

ZANATA_SERVER_URL: URL to Zanata server

Options:
    -h: Show usage
    -i: Interval between retries in seconds
    -r: Times of retries.
    -p: Grep-like patten to be captured.
    -v: VerboseLevel (Default is 1)
        0: Nothing is output
        1: Only the final results
        2: Print result for each check.
        3: curl message as well.

Return value:
    0: Zanata server is up eventually.
    1: Zanata server is still down after the retries.
END
}

# platform >= 4 has /account/.*login
# server <= 3 has /account/sign_in
UP_PATTERN="/account/(.*login|sign_in)"

# Retry interval: Default: 30 sec
INTERVAL=30
RETRIES=5
VERBOSE=1

check_connection(){
    if [ $VERBOSE -lt 3 ]; then
        QUIET="--silent"
    else
        QUIET=""
    fi
    if curl ${QUIET} --insecure --location $ZANATA_SERVER_URL | grep -q -E -e "$UP_PATTERN" ; then
        UP=1
        if [ $VERBOSE -ge 1 ]; then
            echo "Zanata server on $ZANATA_SERVER_URL is [UP]"
        fi
    else
        UP=0
        if [ $VERBOSE -ge 2 ]; then
            echo "Zanata server on $ZANATA_SERVER_URL is [DOWN]"
        fi
    fi

    if [ "$UP" = "0" ];then
        return 1
    fi
    return 0;
}

while getopts "hi:r:p:v:" opt; do
    case $opt in
        h)
            print_usage
            exit 0
            ;;
        i)
            INTERVAL=$OPTARG
            ;;
        r)
            RETRIES=$OPTARG
            ;;
        p)
            UP_PATTERN=$OPTARG
            ;;
        v)
            VERBOSE=$OPTARG
            ;;
        *)
            ;;
    esac
done
shift $((OPTIND-1));

ZANATA_SERVER_URL=$1

if [ -z $ZANATA_SERVER_URL ]; then
    print_usage
    exit -1
fi


if check_connection; then
    exit 0;
fi

retries=0
up=0
until [ "$retries" = "$RETRIES" ]; do
    let retries++
    echo "Checking pattern: $UP_PATTERN, retries $retries in $INTERVAL seconds"
    sleep $INTERVAL
    if check_connection; then
        exit 0
    fi
done
if [ $VERBOSE -ge 1 ]; then
    echo "Zanata server on $ZANATA_SERVER_URL is still [DOWN] after $retries retries"
fi
exit 1