telegram-bot-bash/modules/background.sh

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#!/bin/bash
# file: modules/background.sh
# do not edit, this file will be overwritten on update
# This file is public domain in the USA and all free countries.
# Elsewhere, consider it to be WTFPLv2. (wtfpl.net/txt/copying)
#
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# shellcheck disable=SC1117,SC2059
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#### $$VERSION$$ v1.45-dev-48-gf4d45d8
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# will be automatically sourced from bashbot
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# source once magic, function named like file
eval "$(basename "${BASH_SOURCE[0]}")(){ :; }"
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######
# interactive and background functions
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# old syntax as aliases
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background() {
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start_back "${CHAT[ID]}" "$1" "$2"
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}
startproc() {
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start_proc "${CHAT[ID]}" "$1" "$2"
}
checkback() {
check_back "${CHAT[ID]}" "$1"
}
checkproc() {
check_proc "${CHAT[ID]}" "$1"
}
killback() {
kill_back "${CHAT[ID]}" "$1"
}
killproc() {
kill_proc "${CHAT[ID]}" "$1"
}
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# inline and background functions
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# $1 chatid
# $2 program
# $3 jobname
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# $4 $5 parameters
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start_back() {
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local cmdfile; cmdfile="${DATADIR:-.}/$(procname "$1")$3-back.cmd"
printf '%s\n' "$1:$3:$2" >"${cmdfile}"
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restart_back "$@"
}
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# $1 chatid
# $2 program
# $3 jobname
# $4 $5 parameters
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restart_back() {
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local fifo; fifo="${DATADIR:-.}/$(procname "$1" "back-$3-")"
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log_update "Start background job CHAT=$1 JOB=${fifo##*/} CMD=${2##*/} $4 $5"
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check_back "$1" "$3" && kill_proc "$1" "back-$3-"
nohup bash -c "{ $2 \"$4\" \"$5\" \"${fifo}\" | \"${SCRIPT}\" outproc \"$1\" \"${fifo}\"; }" &>>"${fifo}.log" &
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sleep 0.5 # give bg job some time to init
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}
# $1 chatid
# $2 program
# $3 $4 parameters
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start_proc() {
[ -z "$2" ] && return
[ -x "${2%% *}" ] || return 1
local fifo; fifo="${DATADIR:-.}/$(procname "$1")"
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check_proc "$1" && kill_proc "$1"
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mkfifo "${fifo}"
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log_update "Start interactive script CHAT=$1 JOB=${fifo##*/} CMD=$2 $3 $4"
nohup bash -c "{ $2 \"$4\" \"$5\" \"${fifo}\" | \"${SCRIPT}\" outproc \"$1\" \"${fifo}\"
rm \"${fifo}\"; [ -s \"${fifo}.log\" ] || rm -f \"${fifo}.log\"; }" &>>"${fifo}.log" &
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}
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# $1 chatid
# $2 jobname
check_back() {
check_proc "$1" "back-$2-"
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}
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# $1 chatid
# $2 prefix
check_proc() {
[ -n "$(proclist "$(procname "$1" "$2")")" ]
# shellcheck disable=SC2034
res=$?; return $?
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}
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# $1 chatid
# $2 jobname
kill_back() {
kill_proc "$1" "back-$2-"
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rm -f "${DATADIR:-.}/$(procname "$1")$2-back.cmd"
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}
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# $1 chatid
# $2 prefix
kill_proc() {
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local fifo prid
fifo="$(procname "$1" "$2")"
prid="$(proclist "${fifo}")"
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fifo="${DATADIR:-.}/${fifo}"
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# shellcheck disable=SC2086
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if [ -n "${prid}" ]; then
log_update "Stop interactive / background CHAT=$1 JOB=${fifo##*/}"
kill ${prid}
fi
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[ -s "${fifo}.log" ] || rm -f "${fifo}.log"
[ -p "${fifo}" ] && rm -f "${fifo}";
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}
# $1 chatid
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# $2 message
send_interactive() {
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local fifo; fifo="${DATADIR:-.}/$(procname "$1")"
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[ -p "${fifo}" ] && printf '%s\n' "$2" >"${fifo}" & # not blocking!
}
# old style but may not work because of local checks
inproc() {
send_interactive "${CHAT[ID]}" "${MESSAGE[0]}"
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}
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# start stop all jobs
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# $1 command # kill suspend resume restart
job_control() {
local BOT ADM content proc CHAT job fifo killall=""
BOT="$(getConfigKey "botname")"
ADM="$(getConfigKey "botadmin")"
debug_checks "Enter job_control" "$1"
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for FILE in "${DATADIR:-.}/"*-back.cmd; do
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[ "${FILE}" = "${DATADIR:-.}/*-back.cmd" ] && printf "${RED}No background processes.${NN}" && break
content="$(< "${FILE}")"
CHAT="${content%%:*}"
job="${content#*:}"
proc="${job#*:}"
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job="${job%:*}"
fifo="$(procname "${CHAT}" "${job}")"
debug_checks "Execute job_control" "$1" "${FILE##*/}"
case "$1" in
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"resume"*|"restart"*)
printf "Restart Job: %s %s\n" "${proc}" " ${fifo##*/}"
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restart_back "${CHAT}" "${proc}" "${job}"
# inform botadmin about stop
[ -n "${ADM}" ] && send_normal_message "${ADM}" "Bot ${BOT} restart background jobs ..." &
;;
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"suspend"*)
printf "Suspend Job: %s %s\n" "${proc}" " ${fifo##*/}"
kill_proc "${CHAT}" "${job}"
# inform botadmin about stop
[ -n "${ADM}" ] && send_normal_message "${ADM}" "Bot ${BOT} suspend background jobs ..." &
killall="y"
;;
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"kill"*)
printf "Kill Job: %s %s\n" "${proc}" " ${fifo##*/}"
kill_proc "${CHAT}" "${job}"
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rm -f "${FILE}" # remove job
# inform botadmin about stop
[ -n "${ADM}" ] && send_normal_message "${ADM}" "Bot ${BOT} kill background jobs ..." &
killall="y"
;;
esac
# send message only onnfirst job
ADM=""
done
debug_checks "end job_control" "$1"
# kill all requestet. kill ALL background jobs, even not listed in data-bot-bash
[ "${killall}" = "y" ] && killallproc "back-"
}