check_aspnetcore_healthcheck

#!/bin/bash

POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -u|--url)
    url="$2"
    shift # past argument
    shift # past value
    ;;
    -n|--health-check-name)
    json_query="$2"
    shift # past argument
    shift # past value
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters


# ICINGA Status Codes
STATUS_OK=0
STATUS_WARNING=1
STATUS_CRITICAL=2
STATUS_UNKNOWN=3


json=`curl -sS $url` || exit $STATUS_CRITICAL

if [ "$json_query" = "" ]; then    
    status=`echo $json | jq -r ".status"`
    duration=`echo $json | jq -r ".totalDuration"`
    entries=`echo $json | jq -r ".entries"`
    message="Overall status fetched, see details below [$duration]"$'\n'"$entries"
else
    status=`echo $json | jq -r ".entries.\"$json_query\".status"`
    duration=`echo $json | jq -r ".entries.\"$json_query\".duration"`
    data=`echo $json | jq -r ".entries.\"$json_query\".data"`
    description=`echo $json | jq -r ".entries.\"$json_query\".description"`
    message="$description [$duration]"$'\n'"Data: $data"
fi


case "$status" in
    Healthy) 
        echo "OK: $message"
        exit $STATUS_OK
        ;;
    Degraded) 
        echo "WARNING: $message"
        exit $STATUS_WARNING
        ;;
    Unhealthy) 
        echo "CRITICAL: $message"
        exit $STATUS_CRITICAL
        ;;
    *) 
        echo "CRITICAL: Error interpreting service response"
        echo $json
        exit $STATUS_CRITICAL
        ;;
esac