status.inspin.io/tinystatus

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#!/usr/bin/env sh
title=tinystatus
timeout=10
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tmp="$(mktemp -d)"
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checkfile="${1:-checks.list}"
incidentsfile="${2:-incidents.list}"
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useragent="User-Agent: Mozilla/5.0 (X11; Linux x86_64; Debian) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36"
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command_exists(){
if ! command -v "${1}" >/dev/null 2>&1; then
echo >&2 "Error: ${1} missing. Please install it"
exit 1
fi
}
get_element(){
echo "${2}" | awk -v col="${1}" -F'|' '{gsub(/^[ \t]+|[ \t]+$/, "", $col); print $col}'
}
check(){
ctype="${1}"
host="${2}"
name="${3}"
expectedcode="${4}"
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IPv="$(echo "${ctype}" | grep -o '[0-9]$')"
case "${ctype}" in
http*)
statuscode="$(curl -${IPv}sSkLo /dev/null -H "${useragent}" -m "${timeout}" -w "%{http_code}" "${host}" 2> "${tmp}/ko/${name}.error")";;
ping*)
ping -W${IPv} "${timeout}" -c 1 "${host}" >/dev/null 2>&1
statuscode=$?
[ ${statuscode} -ne ${expectedcode} ] && echo 'Host unreachable' > "${tmp}/ko/${name}.error";;
port*)
error="$(nc -w${IPv} "${timeout}" -zv ${host} 2>&1)"
statuscode=$?
[ ${statuscode} -ne ${expectedcode} ] && echo "${error}" > "${tmp}/ko/${name}.error";;
esac
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# verity status and write files
if [ ${statuscode} -eq ${expectedcode} ]; then
echo "Status code: ${statuscode}" > "${tmp}/ok/${name}.status"
else
echo "Status code: ${statuscode}" > "${tmp}/ko/${name}.status"
fi
if [ -s "${tmp}/ko/${name}.error" ]; then
sed "${tmp}/ko/${name}.error" \
-e 's,curl: ([0-9]*) ,,' \
-e 's,.*) failed: ,,' > "${tmp}/ko/${name}.status"
fi
}
command_exists 'curl'
command_exists 'nc'
mkdir -p "${tmp}/ok" "${tmp}/ko" || exit 1
while IFS='\n' read -r line; do
ctype="$(get_element 1 "${line}")"
code="$(get_element 2 "${line}")"
name="$(get_element 3 "${line}")"
host="$(get_element 4 "${line}")"
check "${ctype}" "${host}" "${name}" "${code}" &
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done < "${checkfile}"
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wait
cat << EOF
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>${title}</title><style>
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body { font-family: segoe ui,Roboto,Oxygen-Sans,Ubuntu,Cantarell,helvetica neue,Verdana,sans-serif; }
h1 { margin-top: 30px; }
ul { padding: 0px; }
li { list-style: none; margin-bottom: 2px; padding: 5px; border-bottom: 1px solid #ddd; }
.container { max-width: 600px; width: 100%; margin: 15px auto; }
.panel { text-align: center; padding: 10px; border: 0px; border-radius: 5px; }
.failed-bg { color: white; background-color: #E25D6A; }
.success-bg { color: white; background-color: #52B86A; }
.failed { color: #E25D6A; }
.success { color: #52B86A; }
.small { font-size: 80%; }
.status { float: right; }
</style></head>
<body>
<div class='container'>
<h1>Global status</h1>
EOF
outagenb=$(find ${tmp}/ko -mindepth 1 | grep -c 'status$')
if [ ${outagenb} -ne 0 ]; then
echo "<ul><li class='panel failed-bg'>${outagenb} Outage(s)</li></ul>"
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exitcode=1
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else
echo "<ul><li class='panel success-bg'>All Systems Operational</li></ul>"
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exitcode=0
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fi
cat << EOF
<h1>Services</h1>
<ul>
EOF
for file in ${tmp}/ko/*.status; do
[ -e "${file}" ] || continue
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name="$(basename "${file}" | sed 's,.status$,,')"
status="$(cat "${file}")"
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echo "<li>${name} <span class='small failed'>(${status})</span><span class='status failed'>Disrupted</span></li>"
done
for file in ${tmp}/ok/*.status; do
[ -e "${file}" ] || continue
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name="$(basename "${file}" | sed 's,.status$,,')"
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echo "<li>${name} <span class='status success'>Operational</span></li>"
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done
cat << EOF
</ul>
<p class=small> Last check: $(date -I'seconds')</p>
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EOF
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if [ -f "${incidentsfile}" ]; then
echo '<h1>Incidents</h1>'
if [ -s "${incidentsfile}" ]; then
sed 's|^\(.*\)$|<p>\1</p>|' "${incidentsfile}"
else
echo '<p>No incident reported yet ;)</p>'
fi
fi
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cat <<EOF
</div>
</body></html>
EOF
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rm -r "${tmp}" 2>/dev/null
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# Allow the script execution itself to signal success, e.g. for use in healthchecks
exit ${exitcode}