Check urls for 200s or send slack message

http-health-slack.sh

#!/bin/bash
WORK_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
set -ueo pipefail
checkTimeout=6
SEND_ERROR_MAIL=1

cd "$WORK_DIR"

function send_to_slack {
    local status=$1
    local service=$2
    local color=good
    local image=""
    local pretext=""
    local slack_url="<CHANGEME>"
    case $status in
        200)
            color="good"
            pretext="Website responding normally."
            image="https://res.cloudinary.com/byrnedo/image/upload/v1457347239/godmode_ofwzk7.jpg"
            ;;
        *)
            color="danger"
            pretext="Website returned unexpected status $status"
            image="https://res.cloudinary.com/byrnedo/image/upload/v1457345752/doom_fvhzga.png"
            ;;
        
    esac

    attachment="{\"fallback\":\"$service: http check status is $status\",\"title\":\"$service: http check status is $status\",\"pretext\":\"$pretext\",\"color\":\"$color\",\"thumb_url\":\"$image\",\"fields\":[{\"title\":\"Service\",\"value\":\"$service\",\"short\":true},{\"title\":\"Url\",\"value\":\"https://${service}\",\"short\":true},{\"title\":\"Status\",\"value\":\"$status\",\"short\":true}]}"

    curl --silent -X POST -H 'Content-type: application/json' --data-binary @- $slack_url << EOFF
    {
	"channel": "service-alerts",
        "attachments": [
        $attachment
        ]
    }
EOFF
}

for service in acme.example.com acme2.example.com
do
    set  +e
    # do curl
    code=$(curl -s -o /dev/null -w "%{http_code}" -L "https://${service}")
    set -e
    echo "Result ${code}"
    result="$code"
    if [[ ${result} -ne 200 ]]
    then
        echo "error code ${result} checking ${service}"

        sendMail=0
        if [[ -f ./LAST_ALERT_NOTICE_${service} ]]
        then
            if [[ $(( (`date +%s` - `stat -L --format %Y ./LAST_ALERT_NOTICE_${service}`) > (10*60) )) -eq 1 ]]
            then
                rm ./LAST_ALERT_NOTICE_${service}
                sendMail=${SEND_ERROR_MAIL}
            else
                echo not sending notice as less than 10 minutes since last
            fi
        else
            touch ./LAST_ALERT_NOTICE_${service}
            sendMail=${SEND_ERROR_MAIL}
        fi
        if [[ ${sendMail} -eq ${SEND_ERROR_MAIL} ]]
        then
            send_to_slack ${result} ${service}
        fi
    else
        echo "healthy response from ${service}"
        if [[ -f ./LAST_ALERT_NOTICE_${service} ]]
        then
            echo "Sending service ok notice"
            send_to_slack ${result} ${service}
            rm ./LAST_ALERT_NOTICE_${service}
        fi
    fi
done