telegram-bot-bash/modules/jsonDB.sh

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2019-05-27 12:30:21 +00:00
#!/bin/bash
# file: modules/jsshDB.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)
#
#### $$VERSION$$ v0.96-pre-24-g5b25821
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#
# source from commands.sh to use jsonDB functions
#
# jsonDB provides simple functions to read and store bash Arrays
# from to file in JSON.sh output format, its a simple key/value storage.
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# source once magic, function named like file
eval "$(basename "${BASH_SOURCE[0]}")(){ :; }"
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# new feature: serialize / atomic operations:
# updates will be done atomic with flock
# flock should flock should be availible on all system as its part of busybox
# tinybox
# lockfile filename.flock is persistent and will be testet with flock for active lock (file open)
export BASHBOT_LOCKNAME=".flock"
if _exists flock; then
###############
# we have flock
# use flock for atomic operations
# read content of a file in JSON.sh format into given ARRAY
# $1 ARRAY name, must be delared with "declare -A ARRAY" upfront
# $2 filename, must be relative to BASHBOT_ETC, and not contain '..'
jssh_readDB() {
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
# shared lock, many processes can read, max wait 1s
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{ flock -s -w 1 200; Json2Array "$1" <"${DB}"; } 200>"${DB}${BASHBOT_LOCKNAME}"
}
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# write ARRAY content to a file in JSON.sh format
# Warning: old content is overwritten
# $1 ARRAY name, must be delared with "declare -A ARRAY" upfront
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_writeDB() {
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
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# exclusive lock, no other process can read or write, maximum wait to get lock is 10s
{ flock -e -w 10 200; Array2Json "$1" >"${DB}"; } 200>"${DB}${BASHBOT_LOCKNAME}"
}
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# update/write ARRAY content in file without deleting keys not in ARRAY
# $1 ARRAY name, must be delared with "declare -A ARRAY" upfront
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_updateDB() {
# for atomic update we cant use read/writeDB
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
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declare -n ARRAY="$1"
[ -z "${ARRAY[*]}" ] && return 1
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declare -A oldARR
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# start atomic update here, exclusive max wait 10s
{ flock -e -w 10 200
Json2Array "oldARR" <"${DB}"
if [ -z "${oldARR[*]}" ]; then
# no old content
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Array2Json "$1" >"${DB}"
else
# merge arrays
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local key
for key in "${!ARRAY[@]}"
do
oldARR["${key}"]="${ARRAY["${key}"]}"
done
Array2Json "oldARR" >"${DB}"
fi
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} 200>"${DB}${BASHBOT_LOCKNAME}"
}
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# insert, update, apped key/value to jsshDB
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 key value
# $3 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
alias jssh_insertDB=jssh_insertKeyDB # backward compatibility
# renamed to be more consistent
jssh_insertKeyDB() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local key="$1" value="$2"
local DB; DB="$(jssh_checkDB "$3")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
# start atomic update here, exclusive max wait 2, it's append, not overwrite
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{ flock -e -w 2 200
# it's append, but last one counts, its a simple DB ...
printf '["%s"]\t"%s"\n' "${key//,/\",\"}" "${value//\"/\\\"}" >>"${DB}"
} 200>"${DB}${BASHBOT_LOCKNAME}"
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}
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# delete key/value from jsshDB
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_deleteKeyDB() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
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local DB; DB="$(jssh_checkDB "$2")"
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declare -A oldARR
# start atomic delete here, exclusive max wait 10s
{ flock -e -w 10 200
Json2Array "oldARR" <"${DB}"
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unset oldARR["$1"]
Array2Json "oldARR" >"${DB}"
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} 200>"${DB}${BASHBOT_LOCKNAME}"
}
# get key/value from jsshDB
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
alias jssh_getDB=jssh_getKeyDB
jssh_getKeyDB() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB; DB="$(jssh_checkDB "$2")"
declare -A oldARR
# start atomic delete here, exclusive max wait 1s
{ flock -s -w 1 200
Json2Array "oldARR" <"${DB}"
} 200>"${DB}${BASHBOT_LOCKNAME}"
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printf '%s' "${oldARR["$1"]}"
}
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# add a value to key, used for conters
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
# $3 optional count, value added to counter, add 1 if empty
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# side effect: if $3 is not given, we add to end of file to be as fast as possible
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jssh_countKeyDB() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
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local DB; DB="$(jssh_checkDB "$2")"
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declare -A oldARR
# start atomic delete here, exclusive max wait 5
{ flock -e -w 5 200
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Json2Array "oldARR" <"${DB}"
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if [ "$3" != "" ]; then
(( oldARR["$1"]+="$3" ));
Array2Json "oldARR" >"${DB}"
else
# it's append, but last one counts, its a simple DB ...
(( oldARR["$1"]++ ));
printf '["%s"]\t"%s"\n' "${1//,/\",\"}" "${oldARR["$1"]//\"/\\\"}" >>"${DB}"
fi
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} 200>"${DB}${BASHBOT_LOCKNAME}"
}
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# update key/value in place to jsshDB
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 key value
# $3 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
#no own locking, so async is the same as updatekeyDB
jssh_updateKeyDB() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
declare -A oldARR
oldARR["$1"]="$2"
jssh_updateDB "oldARR" "${3}" || return 3
}
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# $1 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_clearDB() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
{ flock -e -w 10 200
printf '' >"${DB}"
} 200>"${DB}${BASHBOT_LOCKNAME}"
}
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else
#########
# we have no flock, use "old" not atomic functions
alias jssh_readDB=ssh_readDB_async
alias jssh_writeDB=jssh_writeDB_async
alias jssh_updateDB=jssh_updateDB_async
alias jssh_insertDB=jssh_insertDB_async
alias ssh_deleteKeyDB=jssh_deleteKeyDB_async
alias jssh_getDB=jssh_getKeyDB_async
alias jssh_getKeyDB=jssh_getKeyDB_async
alias jssh_countKeyDB=jssh_countKeyDB_async
alias jssh_updateKeyDB=jssh_updateKeyDB_async
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alias jssh_clearDB=jssh_clearDB_async
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fi
##############
# no need for atomic
# print ARRAY content to stdout instead of file
# $1 ARRAY name, must be delared with "declare -A ARRAY" upfront
jssh_printDB_async() { jssh_printDB "$@"; }
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jssh_printDB() {
Array2Json "$1"
}
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# $1 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_newDB_async() { jssh_newDB "$@"; }
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jssh_newDB() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
[ -f "${DB}" ] && return 2 # already exist
touch "${DB}"
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}
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# $1 filename, check filename, it must be relative to BASHBOT_VAR, and not contain '..'
# returns real path to DB file if everything is ok
jssh_checkDB_sync() { jssh_checkDB "$@"; }
jssh_checkDB(){
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local DB
[ -z "$1" ] && return 1
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[[ "$1" = *'..'* ]] && return 2
if [[ "$1" == "${BASHBOT_VAR:-.}"* ]] || [[ "$1" == "${BASHBOT_DATA:-.}"* ]]; then
DB="$1.jssh"
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else
DB="${BASHBOT_VAR:-.}/$1.jssh"
fi
printf '%s' "${DB}"
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}
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######################
# implementations as non atomic functions
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# can be used explictitly or as fallback if flock is not availible
jssh_readDB_async() {
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
Json2Array "$1" <"${DB}"
}
jssh_writeDB_async() {
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
Array2Json "$1" >"${DB}"
}
jssh_updateDB_async() {
declare -n ARRAY="$1"
[ -z "${ARRAY[*]}" ] && return 1
declare -A oldARR
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jssh_readDB_async "oldARR" "$2" || return "$?"
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if [ -z "${oldARR[*]}" ]; then
# no old content
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jssh_writeDB_async "$1" "$2"
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else
# merge arrays
local key
for key in "${!ARRAY[@]}"
do
oldARR["${key}"]="${ARRAY["${key}"]}"
done
Array2Json "oldARR" >"${DB}"
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fi
}
jssh_insertDB_async() { jssh_insertKeyDB "$@"; }
jssh_insertKeyDB_async() {
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[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local key="$1" value="$2"
local DB; DB="$(jssh_checkDB "$3")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
# its append, but last one counts, its a simple DB ...
printf '["%s"]\t"%s"\n' "${key//,/\",\"}" "${value//\"/\\\"}" >>"${DB}"
}
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jssh_deleteKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
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local DB; DB="$(jssh_checkDB "$2")"
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declare -A oldARR
Json2Array "oldARR" <"${DB}"
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unset oldARR["$1"]
Array2Json "oldARR" >"${DB}"
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}
jssh_getKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB; DB="$(jssh_checkDB "$2")"
declare -A oldARR
Json2Array "oldARR" <"${DB}"
printf '%s' "${oldARR["$1"]}"
}
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jssh_countKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB COUNT="1"; DB="$(jssh_checkDB "$2")"
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[ "$3" != "" ] && COUNT="$3"
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declare -A oldARR
# start atomic delete here, exclusive max wait 10s
Json2Array "oldARR" <"${DB}"
(( oldARR["$1"]+=COUNT ));
Array2Json "oldARR" >"${DB}"
}
# updatie key/value in place to jsshDB
# $1 key name, can onyl contain -a-zA-Z0-9,._
# $2 key value
# $3 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
#no own locking, so async is the same as updatekeyDB
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jssh_updateKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
declare -A oldARR
oldARR["$1"]="$2"
jssh_updateDB_async "oldARR" "${3}" || return 3
}
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jssh_clearDB_async() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
printf '' >"${DB}"
}