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Diffstat (limited to 'backends/nc-backend.sh')
| -rwxr-xr-x | backends/nc-backend.sh | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/backends/nc-backend.sh b/backends/nc-backend.sh deleted file mode 100755 index 65704b98..00000000 --- a/backends/nc-backend.sh +++ /dev/null @@ -1,158 +0,0 @@ -#!/usr/bin/env bash - -# SPDX-License-Identifier: GPL-3.0-or-later - -# This is a simple backend database proxy, written in BASH, using the nc command. -# Run the script without any parameters for help. - -MODE="${1}" -MY_PORT="${2}" -BACKEND_HOST="${3}" -BACKEND_PORT="${4}" -FILE="${NETDATA_NC_BACKEND_DIR-/tmp}/netdata-nc-backend-${MY_PORT}" - -log() { - logger --stderr --id=$$ --tag "netdata-nc-backend" "${*}" -} - -mync() { - local ret - - log "Running: nc ${*}" - nc "${@}" - ret=$? - - log "nc stopped with return code ${ret}." - - return ${ret} -} - -listen_save_replay_forever() { - local file="${1}" port="${2}" real_backend_host="${3}" real_backend_port="${4}" ret delay=1 started ended - - while true - do - log "Starting nc to listen on port ${port} and save metrics to ${file}" - - started=$(date +%s) - mync -l -p "${port}" | tee -a -p --output-error=exit "${file}" - ended=$(date +%s) - - if [ -s "${file}" ] - then - if [ ! -z "${real_backend_host}" ] && [ ! -z "${real_backend_port}" ] - then - log "Attempting to send the metrics to the real backend at ${real_backend_host}:${real_backend_port}" - - mync "${real_backend_host}" "${real_backend_port}" <"${file}" - ret=$? - - if [ ${ret} -eq 0 ] - then - log "Successfully sent the metrics to ${real_backend_host}:${real_backend_port}" - mv "${file}" "${file}.old" - touch "${file}" - else - log "Failed to send the metrics to ${real_backend_host}:${real_backend_port} (nc returned ${ret}) - appending more data to ${file}" - fi - else - log "No backend configured - appending more data to ${file}" - fi - fi - - # prevent a CPU hungry infinite loop - # if nc cannot listen to port - if [ $((ended - started)) -lt 5 ] - then - log "nc has been stopped too fast." - delay=30 - else - delay=1 - fi - - log "Waiting ${delay} seconds before listening again for data." - sleep ${delay} - done -} - -if [ "${MODE}" = "start" ] - then - - # start the listener, in exclusive mode - # only one can use the same file/port at a time - { - flock -n 9 - # shellcheck disable=SC2181 - if [ $? -ne 0 ] - then - log "Cannot get exclusive lock on file ${FILE}.lock - Am I running multiple times?" - exit 2 - fi - - # save our PID to the lock file - echo "$$" >"${FILE}.lock" - - listen_save_replay_forever "${FILE}" "${MY_PORT}" "${BACKEND_HOST}" "${BACKEND_PORT}" - ret=$? - - log "listener exited." - exit ${ret} - - } 9>>"${FILE}.lock" - - # we can only get here if ${FILE}.lock cannot be created - log "Cannot create file ${FILE}." - exit 3 - -elif [ "${MODE}" = "stop" ] - then - - { - flock -n 9 - # shellcheck disable=SC2181 - if [ $? -ne 0 ] - then - pid=$(<"${FILE}".lock) - log "Killing process ${pid}..." - kill -TERM "-${pid}" - exit 0 - fi - - log "File ${FILE}.lock has been locked by me but it shouldn't. Is a collector running?" - exit 4 - - } 9<"${FILE}.lock" - - log "File ${FILE}.lock does not exist. Is a collector running?" - exit 5 - -else - - cat <<EOF -Usage: - - "${0}" start|stop PORT [BACKEND_HOST BACKEND_PORT] - - PORT The port this script will listen - (configure netdata to use this as a second backend) - - BACKEND_HOST The real backend host - BACKEND_PORT The real backend port - - This script can act as fallback backend for netdata. - It will receive metrics from netdata, save them to - ${FILE} - and once netdata reconnects to the real-backend, this script - will push all metrics collected to the real-backend too and - wait for a failure to happen again. - - Only one netdata can connect to this script at a time. - If you need fallback for multiple netdata, run this script - multiple times with different ports. - - You can run me in the background with this: - - screen -d -m "${0}" start PORT [BACKEND_HOST BACKEND_PORT] -EOF - exit 1 -fi |