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#!/usr/bin/env bash
#
# ============LICENSE_START=======================================================
# Copyright (c) 2017-2020 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END=========================================================
# basics
current_cmd=`basename $0`
current_module=`echo $current_cmd | cut -d"." -f1`
# get base_dir from current script invocation
bin_base_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
base_dir=`dirname ${bin_base_dir}`
snmptrapd_pid_file=${base_dir}/tmp/${current_module}.py.pid
scheduler_pid_file=${base_dir}/tmp/scheduler.sh.pid
start_dir=${base_dir}/bin
# global return code
# - required because functions ultimately call log_msg, which
# is to stdout, which conflicts with "echo <return_value>"
# in the functions themselves
g_return=0
# include path to 3.6+ version of python that has required dependencies included
export PATH=/opt/app/python-3.6.1/bin:$PATH
# set location of SSL certificates
# export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-bundle.crt # open source/external world
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt # otherwise...
# find the best tool for the job
if [ `command -v pypy3` ]
then
PY_BINARY=pypy3
else
if [ `command -v python3` ]
then
PY_BINARY=python3
else
if [ `command -v python` ]
then
PY_BINARY=python
else
echo "ERROR: no pypy3 or python available in container - FATAL ERROR, exiting"
exit 1
fi
fi
fi
# expand search for python modules to include ./mod in current/runtime dir
export PYTHONPATH=${bin_base_dir}/mod:$PYTHONPATH
# PYTHONUNBUFFERED:
# set PYTHONUNBUFFERED to a non-empty string to avoid output buffering;
# comment out for runtime environments/better performance!
# export PYTHONUNBUFFERED="True"
# set location of config broker server overrride IF NEEDED
#
export CBS_SIM_JSON=${base_dir}/etc/snmptrapd.json
# misc
exit_after=1
# # # # # # # # # #
# log_msg - log messages to stdout in standard manner
# # # # # # # # # #
log_msg()
{
msg=$*
echo "`date +%Y-%m-%dT%H:%M:%S,%N | cut -c1-23` ${msg}"
}
#
# start process
#
start_process()
{
process_name=$1
pid_file=$2
exec_cmd=$3
# check if exec_cmd has a pid_file
if [ ! -r ${pid_file} ]
then
log_msg "Starting ${process_name}"
stdout_fd=${base_dir}/logs/${process_name}.out
if [ -f ${stdout_fd} ]
then
mv -f ${stdout_fd} ${stdout_fd}.bak
fi
${exec_cmd} >> ${base_dir}/logs/${process_name}.out 2>&1 &
g_return=$?
echo $! > ${pid_file}
else
pid=$(cat ${pid_file})
if ps -p ${pid} > /dev/null
then
g_return=$?
log_msg "${process_name} already running - PID ${pid}"
else
log_msg "PID file present, but no corresponding process. Starting ${process_name}"
${exec_cmd} >> ${base_dir}/logs/${process_name}.out 2>&1 &
g_return=$?
echo $! > ${pid_file}
fi
fi
}
# # # # # # # # # #
# Start the service
# # # # # # # # # #
start_service()
{
# Hints for startup modifications:
# _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
# handy for debug (e.g. docker logs output)
# log_msg "Runtime env present for ${current_module} placed in ${base_dir}/logs/${current_module}.out"
env >> ${base_dir}/logs/${current_module}.out
# standard startup? Use this:
cmd="${PY_BINARY} ${base_dir}/bin/snmptrapd.py"
# want tracing? Use this:
# cmd="${PY_BINARY} ./snmptrapd.py -v"
# unbuffered io for logs? Use this:
# cmd="${PY_BINARY} -u ./snmptrapd.py"
# fmdl: needs further research
# cmd="${PY_BINARY} -m trace --trackcalls ./snmptrapd.py"
cd ${start_dir}
#
# scheduler
#
start_process scheduler ${scheduler_pid_file} "${bin_base_dir}/scheduler.sh"
if [ ${g_return} -ne 0 ]
then
log_msg "ERROR! Unable to start scheduler. Check logs for details."
fi
#
# snmptrapd
#
start_process ${current_module} ${snmptrapd_pid_file} "${cmd}"
if [ ${g_return} -ne 0 ]
then
log_msg "ERROR! Unable to start ${current_module}. Check logs for details."
fi
}
# # # # # # # # # #
# Stop the service
# # # # # # # # # #
stop_process()
{
process_name=$1
pid_file=$2
if [ ! -r ${pid_file} ]
then
log_msg "PID file ${pid_file} does not exist or not readable - unable to stop ${process_name}"
g_return=1
else
pid=$(cat ${pid_file})
pgrep -f ${process_name} | grep "^${pid}" > /dev/null
loc_return=$?
if [ ${loc_return} -eq 0 ]
then
log_msg "Stopping ${process_name} PID ${pid}..."
kill ${pid}
g_return=$?
if [ ${g_return} -eq 0 ]
then
log_msg "Stopped"
else
log_msg "ERROR while terminating ${process_name} PID ${pid} (is it not running or owned by another userID?)"
fi
else
log_msg "${process_name} PID ${pid} not present - skipping"
fi
if [ -w ${pid_file} ]
then
rm -f ${pid_file}
fi
fi
}
# # # # # # # # # # # # # # #
# stop all snmptrapd services
# # # # # # # # # # # # # # #
stop_service()
{
# scheduler
#
stop_process scheduler ${scheduler_pid_file}
# snmptrapd
#
stop_process ${current_module} ${snmptrapd_pid_file}
}
# # # # # # # # # # # # # # #
# Check status of the service
# # # # # # # # # # # # # # #
status_process()
{
process_name=$1
pid_file=$2
if [ -r ${pid_file} ]
then
pid=$(cat ${pid_file})
pgrep -f ${process_name} | grep "^${pid}" > /dev/null
loc_return=$?
if [ ${loc_return} -eq 0 ]
then
log_msg "- ${process_name} running, PID ${pid}"
# ps -f -p ${pid} -f | grep -v PID
g_return=0
else
log_msg "ERROR! ${process_name} not running"
g_return=1
fi
else
log_msg "PID file ${pid_file} does not exist or not readable - unable to check status of ${process_name}"
g_return=1
fi
}
#
#
#
status_service()
{
# scheduler
#
status_process scheduler ${scheduler_pid_file}
loc_return=${g_return}
# snmptrapd
#
status_process ${current_module} ${snmptrapd_pid_file}
loc_return=$((loc_return+g_return))
if [ ${loc_return} -ne 0 ]
then
log_msg "Overall Status: CRITICAL - Required process(es) missing!"
else
log_msg "Overall Status: Normal"
fi
}
# # # # # # # # # # # # # # # # #
# Signal process to reload config
# # # # # # # # # # # # # # # # #
reload_cfg()
{
# only needed for snmptrapd
if [ -r ${snmptrapd_pid_file} ]
then
pid=$(cat ${snmptrapd_pid_file})
ps -p ${pid} > /dev/null 2>&1
loc_return=$?
if [ ${loc_return} ]
then
log_msg "Signaling ${current_module} PID ${pid} to request/read updated configs..."
kill -USR1 ${pid}
g_return=$?
if [ ${g_return} -eq 0 ]
then
log_msg "...Signal complete."
else
log_msg "ERROR signaling ${current_module} (do you have permissions to do this?)"
fi
else
log_msg "ERROR: ${current_module} PID ${pid} does not appear to be running."
fi
else
log_msg "ERROR: ${snmptrapd_pid_file} does not exist - unable to signal for config re-read."
g_return=1
fi
}
# # # # # # # # # # # # # # #
# stop all snmptrapd services
# # # # # # # # # # # # # # #
version()
{
exit_swt=$1
version_fd=${base_dir}/etc/version.dat
if [ -f ${version_fd} ]
then
version_string=`cat ${version_fd}`
log_msg "${version_string}"
ec=0
else
log_msg "ERROR: unable to determine version"
ec=1
fi
if [ "${exit_swt}" == "${exit_after}" ]
then
exit ${ec}
fi
}
# # # # # # # # # # # # #
# M A I N
# # # # # # # # # # # # #
case "$1" in
"start")
version
start_service
sleep 1
status_service
wait
;;
"stop")
version
stop_service
;;
"restart")
version
stop_service
sleep 1
start_service
status_service
;;
"status")
version
status_service
;;
"reloadCfg")
version
reload_cfg
;;
"version")
version ${exit_after}
;;
*)
echo "Usage: ${current_cmd} {start|stop|restart|status|reloadCfg|version}"
g_return=1
esac
exit ${g_return}
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