telegram-bot-bash/modules/jsonDB.sh
Kay Marquardt (Gnadelwartz) c79031f604 prepare 0.98 release
2020-06-26 16:23:16 +02:00

352 lines
11 KiB
Bash

#!/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)
#
#### $$VERSION$$ v0.98-pre2-0-ga597303
#
# 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.
# will be automatically sourced from bashbot
# but can be used independent from bashbot also
# e.g. to create scrupts to manage jssh files
# source once magic, function named like file
eval "$(basename "${BASH_SOURCE[0]}")(){ :; }"
# new feature: serialize / atomic operations:
# updates will be done atomic with flock
# flock should flock should be available 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 JSSH_LOCKNAME=".flock"
# use flock if command exist
if [ "$(LC_ALL=C type -t "flock")" = "file" ]; 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 declared 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
{ flock -s -w 1 200; Json2Array "$1" <"${DB}"; } 200>"${DB}${JSSH_LOCKNAME}"
}
# write ARRAY content to a file in JSON.sh format
# Warning: old content is overwritten
# $1 ARRAY name, must be declared 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
# 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>"${DB}${JSSH_LOCKNAME}"
}
# update/write ARRAY content in file without deleting keys not in ARRAY
# $1 ARRAY name, must be declared with "declare -A ARRAY" upfront
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
# complex slow, warpper async
jssh_updateDB() {
# for atomic update we can't use read/writeDB
[ -z "${2}" ] && return 1
local DB="${2}.jssh" # check in async
[ ! -f "${DB}" ] && return 2
{ flock -e -w 10 200; jssh_updateDB_async "$@"; } 200>"${DB}${JSSH_LOCKNAME}"
}
# insert, update, apped key/value to jsshDB
# $1 key name, can only 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 DB; DB="$(jssh_checkDB "$3")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
# start atomic update here, exclusive max wait 2, it's append, not overwrite
{ flock -e -w 2 200
# it's append, but last one counts, its a simple DB ...
printf '["%s"]\t"%s"\n' "${1//,/\",\"}" "${2//\"/\\\"}" >>"${DB}"
} 200>"${DB}${JSSH_LOCKNAME}"
}
# delete key/value from jsshDB
# $1 key name, can only contain -a-zA-Z0-9,._
# $2 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
# medium complex slow, wrapper async
jssh_deleteKeyDB() {
[ -z "${2}" ] && return 1
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB="${2}.jssh"
# start atomic delete here, exclusive max wait 10s
{ flock -e -w 10 200; jssh_deleteKeyDB_async "$@"; } 200>"${DB}${JSSH_LOCKNAME}"
}
# get key/value from jsshDB
# $1 key name, can only 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 "$2")"
[ -z "${DB}" ] && return 1
# start atomic delete here, exclusive max wait 1s
{ flock -s -w 1 200
[ -r "${DB}" ] && sed -n 's/\["'"$1"'"\]\t*"\(.*\)"/\1/p' <"${DB}" | tail -n 1
} 200>"${DB}${JSSH_LOCKNAME}"
}
# add a value to key, used for conters
# $1 key name, can only 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
# side effect: if $3 is not given, we add to end of file to be as fast as possible
# complex, wrapper to async
jssh_countKeyDB() {
[ -z "${2}" ] && return 1
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB="${2}.jssh"
# start atomic delete here, exclusive max wait 5
{ flock -e -w 5 200; jssh_countKeyDB_async "$@"; } 200>"${DB}${JSSH_LOCKNAME}"
}
# update key/value in place to jsshDB
# $1 key name, can only 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
[ -z "${3}" ] && return 1
declare -A updARR
# shellcheck disable=SC2034
updARR["$1"]="$2"
jssh_updateDB "updARR" "${3}" || return 3
}
# $1 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_clearDB() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
{ flock -e -w 10 200; printf '' >"${DB}"; } 200>"${DB}${JSSH_LOCKNAME}"
}
# updates Array if DB file has changed since last call
# $1 name of array to update
# $2 database
# $3 id used to identify caller
# medium complex, wrapper async
jssh_updateArray() {
[ -z "${2}" ] && return 1
local DB="${2}.jssh" # name check in async
[ ! -f "${DB}" ] && return 2
declare -n ARRAY="$1"
[[ -z "${ARRAY[*]}" || "${DB}" -nt "${DB}.last${3}" ]] && touch "${DB}.last${3}" && jssh_readDB "${1}" "${2}"
}
else
#########
# we have no flock, use non 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
alias jssh_clearDB=jssh_clearDB_async
alias jssh_updateArray=updateArray_async
fi
##############
# no need for atomic
# print ARRAY content to stdout instead of file
# $1 ARRAY name, must be declared with "declare -A ARRAY" upfront
jssh_printDB_async() { jssh_printDB "$@"; }
jssh_printDB() {
Array2Json "$1"
}
# $1 filename (must exist!), must be relative to BASHBOT_ETC, and not contain '..'
jssh_newDB_async() { jssh_newDB "$@"; }
jssh_newDB() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
[ -f "${DB}" ] && return 2 # already exist
touch "${DB}"
}
# $1 filename, check filename, it must be relative to BASHBOT_VAR, and not contain '..'
# returns real path to DB file if everything is ok
jssh_checkDB_async() { jssh_checkDB "$@"; }
jssh_checkDB(){
local DB
[ -z "$1" ] && return 1
[[ "$1" = *'..'* ]] && return 2
if [[ "$1" == "${BASHBOT_VAR:-.}"* ]] || [[ "$1" == "${BASHBOT_DATA:-.}"* ]]; then
DB="${1}.jssh"
else
DB="${BASHBOT_VAR:-.}/${1}.jssh"
fi
[ "${DB}" != ".jssh" ] && printf '%s' "${DB}"
}
######################
# implementations as non atomic functions
# can be used explictitly or as fallback if flock is not available
jssh_readDB_async() {
local DB; DB="$(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() {
[ -z "${2}" ] && return 1
declare -n ARRAY="$1"
[ -z "${ARRAY[*]}" ] && return 1
declare -A oldARR
jssh_readDB_async "oldARR" "$2" || return "$?"
if [ -z "${oldARR[*]}" ]; then
# no old content
jssh_writeDB_async "$1" "$2"
else
# merge arrays
local key
for key in "${!ARRAY[@]}"
do
oldARR["${key}"]="${ARRAY["${key}"]}"
done
Array2Json "oldARR" >"${DB}"
fi
}
jssh_insertDB_async() { jssh_insertKeyDB "$@"; }
jssh_insertKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB; DB="$(jssh_checkDB "$3")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
# its append, but last one counts, its a simple DB ...
printf '["%s"]\t"%s"\n' "${1//,/\",\"}" "${2//\"/\\\"}" >>"${DB}"
}
jssh_deleteKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
declare -A oldARR
Json2Array "oldARR" <"${DB}"
unset oldARR["$1"]
Array2Json "oldARR" >"${DB}"
}
jssh_getKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ -r "${DB}" ] && sed -n 's/\["'"$1"'"\]\t*"\(.*\)"/\1/p' <"${DB}" | tail -n 1
}
jssh_countKeyDB_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
local VAL DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
# start atomic delete here, exclusive max wait 5
if [ -n "$3" ]; then
declare -A oldARR
Json2Array "oldARR" <"${DB}"
(( oldARR["$1"]+="$3" ));
Array2Json "oldARR" >"${DB}"
elif [ -r "${DB}" ]; then
# it's append, but last one counts, its a simple DB ...
VAL="$(sed -n 's/\["'"$1"'"\]\t*"\(.*\)"/\1/p' <"${DB}" | tail -n 1)"
printf '["%s"]\t"%s"\n' "${1//,/\",\"}" "$((++VAL))" >>"${DB}"
fi
}
# updatie key/value in place to jsshDB
# $1 key name, can only 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_async() {
[[ "$1" =~ ^[-a-zA-Z0-9,._]+$ ]] || return 3
[ -z "${3}" ] && return 1
declare -A updARR
# shellcheck disable=SC2034
updARR["$1"]="$2"
jssh_updateDB_async "updARR" "${3}" || return 3
}
jssh_clearDB_async() {
local DB; DB="$(jssh_checkDB "$1")"
[ -z "${DB}" ] && return 1
printf '' >"${DB}"
}
function jssh_updateArray_async() {
local DB; DB="$(jssh_checkDB "$2")"
[ -z "${DB}" ] && return 1
[ ! -f "${DB}" ] && return 2
declare -n ARRAY="$1"
[[ -z "${ARRAY[*]}" || "${DB}" -nt "${DB}.last${3}" ]] && touch "${DB}.last${3}" && jssh_readDB_async "${1}" "${2}"
}
##############
# these 2 functions does all key/value store "magic"
# and convert from/to bash array
# read JSON.sh style data and asssign to an ARRAY
# $1 ARRAY name, must be declared with "declare -A ARRAY" before calling
Json2Array() {
# shellcheck disable=SC1091,SC1090
[ -z "$1" ] || source <( printf "$1"'=( %s )' "$(sed -E -n -e ':x /"text"\]/ { N; s/([^"])\n/\1\\n/g ; tx }' -e '/\["[-0-9a-zA-Z_,."]+"\]\+*\t/ s/\t/=/gp' -e 's/=(true|false)/="\1"/')" )
}
# get Config Key from jssh file without jsshDB
# output ARRAY as JSON.sh style data
# $1 ARRAY name, must be declared with "declare -A ARRAY" before calling
Array2Json() {
[ -z "$1" ] && return 1
local key val
declare -n ARRAY="$1"
for key in "${!ARRAY[@]}"
do
# in case val contains newline convert to \n
val="${ARRAY[${key}]//$'\n'/\\n}"
printf '["%s"]\t"%s"\n' "${key//,/\",\"}" "${val//\"/\\\"}"
done
}