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docker_events.sh
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executable file
·336 lines (288 loc) · 10.7 KB
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#!/usr/bin/env bash
# https://github.com/JulyIghor/DockerEvents
shopt -s extglob
set +H
function printVersion {
echo -e 'Docker Events v1.3
https://github.com/JulyIghor/DockerEvents'
}
function printHelp {
printVersion
echo -e "Usage: $(basename $0) [params]
TELEGRAM_API_TOKEN='..' - Telegram bot API key
TELEGRAM_GROUP_ID='..' - Telegram group id
TELEGRAM_MENTION='..' - Telegram mention list (supports multiple usernames separated by spaces)
FILTER_NAME='+(*)' - filter container name
FILTER_IMAGE='+(*)' - filter image name
FILTER_HEALTH='+(*)' - filter health status (default: !(healthy))
FILTER_EXITCODE='+(*)' - filter exit code (default: !(0|130))
FILTER_RESTART_POLICY='+(*)' - filter restart policy (default: !(no))
HOST_NAME='..' - define a host name for notifications, by default it reads the /etc/hostname file
TIMEZONE='..' - optional time zone for event time, for example America/New_York
"
}
function printError {
echo -e "Error: $@\n"
printHelp
}
function printConfig {
echo -e "
HOST_NAME: ${HOST_NAME}
DOCKER_SOCKET: ${DOCKER_SOCKET}
FILTER_TYPES: ${FILTER_TYPES[@]}
FILTER_EVENTS: ${FILTER_EVENTS[@]}
FILTER_NAME: ${FILTER_NAME}
FILTER_IMAGE: ${FILTER_IMAGE}
FILTER_HEALTH: ${FILTER_HEALTH}
FILTER_EXITCODE: ${FILTER_EXITCODE}
FILTER_RESTART_POLICY: ${FILTER_RESTART_POLICY}
"
}
[ -z "${FILTER_TYPES}" ] && FILTER_TYPES=('container')
[ -z "${FILTER_EVENTS}" ] && FILTER_EVENTS=('start' 'die' 'health_status')
[ -z "${FILTER_NAME}" ] && FILTER_NAME='+(*)'
[ -z "${FILTER_IMAGE}" ] && FILTER_IMAGE='+(*)'
[ -z "${FILTER_HEALTH}" ] && FILTER_HEALTH='!(healthy)' # healthy, unhealthy
[ -z "${FILTER_EXITCODE}" ] && FILTER_EXITCODE='!(0|130)' # 0, ..
[ -z "${FILTER_RESTART_POLICY}" ] && FILTER_RESTART_POLICY='!(no)' # exclude 'no'
[ -z "${HOST_NAME}" ] && HOST_NAME=$(cat /etc/hostname)
[ -z "${TELEGRAM_API_TOKEN}" ] && {
printError "TELEGRAM_API_TOKEN is not defined"
exit 1
}
[ -z "${TELEGRAM_GROUP_ID}" ] && {
printError "TELEGRAM_GROUP_ID is not defined"
exit 1
}
[ -z "${TELEGRAM_MENTION}" ] && TELEGRAM_MENTION=''
[ -z "${TIMEZONE}" ] && TIMEZONE='UTC'
[ -z "${HOST_NAME}" ] && {
printError "HOST_NAME is not defined"
exit 1
}
[ -z "${DOCKER_SOCKET}" ] && DOCKER_SOCKET='/var/run/docker.sock'
JQ_FORMAT_EVENT='.status,.Action,.Actor.Attributes.name,.Actor.Attributes.image,.Actor.Attributes.exitCode,.time,.from,(.id // .Actor.ID // "")'
JQ_FORMAT_INSPECT='[.][0]|.State.Error,.RestartCount,.HostConfig.RestartPolicy.Name'
function htmlEscape {
local s
s=${1//&/&}
s=${s//</<}
s=${s//>/>}
s=${s//'"'/"}
printf -- %s "$s"
}
TITLE="Docker on <b>$(htmlEscape "${HOST_NAME}")</b>"
function telegram_message {
MENTION=''
if [ -n "${TELEGRAM_MENTION}" ]; then
for USER in ${TELEGRAM_MENTION}; do
MENTION="${MENTION}${USER} "
done
fi
MESSAGE="$@"
printf '%s\n' "${MESSAGE}"
PAYLOAD=$(jq -nc \
--arg chat_id "${TELEGRAM_GROUP_ID}" \
--arg text "${MESSAGE}
${MENTION}" \
--arg parse_mode 'HTML' \
'{chat_id: $chat_id, text: $text, parse_mode: $parse_mode}')
RESPONSE=$(curl -sS \
--connect-timeout 10 \
--max-time 30 \
-X POST \
-H 'Content-Type: application/json' \
-d "${PAYLOAD}" \
-w '\n%{http_code}' \
'https://api.telegram.org/bot'${TELEGRAM_API_TOKEN}'/sendMessage' 2>&1)
CURL_STATUS=$?
if [ "${CURL_STATUS}" -ne 0 ]; then
echo "Telegram request error: ${RESPONSE}"
return 1
fi
HTTP_CODE=$(printf '%s\n' "${RESPONSE}" | tail -n 1)
HTTP_BODY=$(printf '%s\n' "${RESPONSE}" | sed '$d')
if [ "${HTTP_CODE}" != '200' ]; then
echo "Telegram request error: HTTP ${HTTP_CODE} ${HTTP_BODY}"
return 1
fi
TELEGRAM_OK=$(printf '%s' "${HTTP_BODY}" | jq -r '.ok // false' 2>/dev/null)
if [ "${TELEGRAM_OK}" != 'true' ]; then
TELEGRAM_DESCRIPTION=$(printf '%s' "${HTTP_BODY}" | jq -r '.description // empty' 2>/dev/null)
if [ -n "${TELEGRAM_DESCRIPTION}" ]; then
echo "Telegram request error: ${TELEGRAM_DESCRIPTION}"
else
echo "Telegram request error: ${HTTP_BODY}"
fi
return 1
fi
}
function docker_event {
readarray -t PARAMS < <(printf '%s\n' "$1" | jq -r "${JQ_FORMAT_EVENT}")
if [ "${#PARAMS[@]}" -ne 8 ]; then
echo params missmatch "${#PARAMS[@]}", expected 8
return
fi
CONTAINER_NAME="${PARAMS[2]}"
CONTAINER_IMAGE="${PARAMS[3]}"
EVENT_EXITCODE="${PARAMS[4]}"
CONTAINER_FROM="${PARAMS[6]}" # unused
CONTAINER_ID="${PARAMS[7]}"
if [ -z "${CONTAINER_ID}" ]; then
echo "skipping ${CONTAINER_NAME} since CONTAINER_ID is missing in docker event"
return
fi
[[ "${CONTAINER_NAME}" == ${FILTER_NAME} ]] || {
echo "skipping ${CONTAINER_NAME} since FILTER_NAME not match filter ${FILTER_NAME}"
return
}
[[ "${CONTAINER_IMAGE}" == ${FILTER_IMAGE} ]] || {
echo "skipping ${CONTAINER_NAME} since CONTAINER_IMAGE (${CONTAINER_IMAGE}) not match filter ${FILTER_IMAGE}"
return
}
INSPECT_RESPONSE=$(curl -sS \
--connect-timeout 5 \
--max-time 10 \
-X GET \
--unix-socket "${DOCKER_SOCKET}" \
-w '\n%{http_code}' \
"http://docker/containers/${CONTAINER_ID}/json" 2>&1)
INSPECT_STATUS=$?
if [ "${INSPECT_STATUS}" -ne 0 ]; then
echo "Docker inspect error for ${CONTAINER_NAME}: ${INSPECT_RESPONSE}"
return
fi
INSPECT_HTTP_CODE=$(printf '%s\n' "${INSPECT_RESPONSE}" | tail -n 1)
INSPECT_BODY=$(printf '%s\n' "${INSPECT_RESPONSE}" | sed '$d')
if [ "${INSPECT_HTTP_CODE}" != '200' ]; then
echo "Docker inspect error for ${CONTAINER_NAME}: HTTP ${INSPECT_HTTP_CODE} ${INSPECT_BODY}"
return
fi
readarray -t INSPECT < <(printf '%s\n' "${INSPECT_BODY}" | jq -r "${JQ_FORMAT_INSPECT}" 2>/dev/null)
if [ "${#INSPECT[@]}" -ne 3 ]; then
echo "Docker inspect error for ${CONTAINER_NAME}: unexpected inspect response"
return
fi
STATE_ERROR="${INSPECT[0]}"
RESTART_COUNT="${INSPECT[1]}"
RESTART_POLICY="${INSPECT[2]}"
[[ "${RESTART_COUNT}" == +(0|null) ]] && RESTART_COUNT=''
[[ "${RESTART_POLICY}" == +(null) ]] && RESTART_POLICY=''
[[ "${STATE_ERROR}" == +(null) ]] && STATE_ERROR=''
[[ "${RESTART_POLICY}" == ${FILTER_RESTART_POLICY} ]] || {
echo "skipping ${CONTAINER_NAME} since FILTER_RESTART_POLICY (${RESTART_POLICY}) not match filter ${FILTER_RESTART_POLICY}"
return
}
EVENT_TIME=$(TZ="${TIMEZONE}" date +"%Y-%m-%d %H:%M:%S ${TIMEZONE}" -d '@'${PARAMS[5]})
MESSAGE=''
case "${PARAMS[1]}" in
start)
MESSAGE='
Container <b>STARTED</b>
'
;;
die)
[[ "${EVENT_EXITCODE}" == ${FILTER_EXITCODE} ]] || {
echo "skipping ${CONTAINER_NAME} since EVENT_EXITCODE (${EVENT_EXITCODE}) not match filter ${FILTER_EXITCODE}"
return
}
case "${EVENT_EXITCODE}" in
132) EVENT_EXITCODE='SIGILL ('${EVENT_EXITCODE}')' ;;
133) EVENT_EXITCODE='SIGTRAP ('${EVENT_EXITCODE}')' ;;
134) EVENT_EXITCODE='SIGABRT ('${EVENT_EXITCODE}')' ;;
136) EVENT_EXITCODE='SIGFPE ('${EVENT_EXITCODE}')' ;;
137) EVENT_EXITCODE='SIGKILL ('${EVENT_EXITCODE}')' ;;
138) EVENT_EXITCODE='SIGBUS ('${EVENT_EXITCODE}')' ;;
139) EVENT_EXITCODE='SIGSEGV ('${EVENT_EXITCODE}')' ;;
152) EVENT_EXITCODE='SIGXCPU ('${EVENT_EXITCODE}')' ;;
158) EVENT_EXITCODE='SIGXCPU ('${EVENT_EXITCODE}')' ;;
153) EVENT_EXITCODE='SIGXFSZ ('${EVENT_EXITCODE}')' ;;
159) EVENT_EXITCODE='SIGXFSZ ('${EVENT_EXITCODE}')' ;;
*) ;;
esac
MESSAGE='
Container <b>STOPPED</b>
Exit code: <b>'"$(htmlEscape ${EVENT_EXITCODE})"'</b>
'
;;
health_status:*)
EVENT_STATUS="${PARAMS[0]:15}"
[[ "${EVENT_STATUS}" == ${FILTER_HEALTH} ]] || {
echo "skipping ${CONTAINER_NAME} since EVENT_STATUS (${EVENT_STATUS}) not match filter ${FILTER_HEALTH}"
return
}
MESSAGE='
Status <b>'"$(htmlEscape ${EVENT_STATUS^^})"'</b>
'
;;
*)
echo 'Unknown event action "'"${PARAMS[1]}"\"
return
;;
esac
[ -z "${MESSAGE}" ] && {
echo "skipping ${CONTAINER_NAME} since MESSAGE is empty"
return
}
[ -z "${STATE_ERROR}" ] || printf -v STATE_ERROR 'State error: <b>%s</b>\n' "$(htmlEscape "${STATE_ERROR}")"
[ -z "${RESTART_COUNT}" ] || printf -v RESTART_COUNT 'Restarts: <b>%s</b>\n' "$(htmlEscape "${RESTART_COUNT}")"
[ -z "${CONTAINER_NAME}" ] || printf -v CONTAINER_NAME 'Name: <code>%s</code>\n' "$(htmlEscape "${CONTAINER_NAME}")"
[ -z "${CONTAINER_IMAGE}" ] || printf -v CONTAINER_IMAGE 'Image: <code>%s</code>\n' "$(htmlEscape "${CONTAINER_IMAGE}")"
[ -z "${RESTART_POLICY}" ] || printf -v RESTART_POLICY 'Restart policy: <b>%s</b>\n' "$(htmlEscape "${RESTART_POLICY}")"
telegram_message "${TITLE}
${MESSAGE}${CONTAINER_NAME}${CONTAINER_IMAGE}${RESTART_POLICY}${RESTART_COUNT}${STATE_ERROR}
<code>${EVENT_TIME}</code>"
}
function array2json { printf '%s\n' "$@" | jq -Rc . | jq -sc .; }
function urlencode {
old_lc_collate=$LC_COLLATE
LC_COLLATE=C
ARG="$@"
local length="${#ARG}"
for ((i = 0; i < length; i++)); do
local c="${ARG:$i:1}"
case $c in
[a-zA-Z0-9.~_-]) printf '%s' "$c" ;;
*) printf '%%%02X' "'$c" ;;
esac
done
LC_COLLATE=$old_lc_collate
}
FILTERS=$(urlencode "{\"type\":$(array2json ${FILTER_TYPES[@]}),\"event\":$(array2json ${FILTER_EVENTS[@]})}")
URL="http://docker/events?filters=${FILTERS}"
SHUTDOWN=0
STREAM_PID=''
SLEEP_PID=''
function request_shutdown {
[ "${SHUTDOWN}" -eq 0 ] || return
SHUTDOWN=1
echo 'Shutdown requested'
[ -z "${STREAM_PID}" ] || kill "${STREAM_PID}" 2>/dev/null || true
[ -z "${SLEEP_PID}" ] || kill "${SLEEP_PID}" 2>/dev/null || true
}
trap request_shutdown TERM INT
printVersion
printConfig
function docker_events_stream {
curl -sS --no-buffer --connect-timeout 10 -XGET --unix-socket "${DOCKER_SOCKET}" "${URL}" |
while IFS= read -r message; do docker_event "${message}"; done
PIPELINE_STATUS=("${PIPESTATUS[@]}")
return "${PIPELINE_STATUS[0]}"
}
while [ "${SHUTDOWN}" -eq 0 ]; do
docker_events_stream &
STREAM_PID=$!
wait "${STREAM_PID}"
STREAM_STATUS=$?
STREAM_PID=''
[ "${SHUTDOWN}" -eq 0 ] || break
if [ "${STREAM_STATUS}" -ne 0 ]; then
echo "Docker events stream error: curl exited with status ${STREAM_STATUS}"
else
echo 'Docker events stream closed unexpectedly'
fi
sleep 5 &
SLEEP_PID=$!
wait "${SLEEP_PID}"
SLEEP_PID=''
done