notif_eos.sh

#!/bin/bash

# todo: make possible to notify more than one telegram url
# todo: make possible to track an account more than once
# todo: add .last_seq to avoid fetching all everytime

# path of this script
NOTIF_EOS_PATH="$(dirname "$(readlink -f "$0")")"

# source config file
source ${NOTIF_EOS_PATH}/notif_eos.conf || exit 1

# check dependencies
which ${CLEOS_PATH} > /dev/null || exit 1
which curl          > /dev/null || exit 1
which jq            > /dev/null || exit 1
which base64        > /dev/null || exit 1

notif_msg()
{
    # usage: notif_msg 'this is sent to the telegram group via api configured'
    if [ $# -ne 1 ]; then
        return 1
    fi

    # send the message
    curl --data chat_id="${TELEGRAM_CHAT}" \
         --data-urlencode "text=$(echo -ne ${1})" "${TELEGRAM_SEND}" \
         > /dev/null 2>&1
}

notif_eos()
{
    # usage: notif_eos 'account_name' 'jq_expression'
    if [ $# -ne 2 ]; then
        return 1
    fi

    # init. params
    page_size=20
    i=0

    # grab all actions
    while true
    do
        page=$(${CLEOS_PATH} get actions --full -j ${1} ${i} ${page_size})
        page_count=$(echo "${page}" | wc -l)

        echo "${page}" | jq -c ${2} | uniq

        # paginate
        i=$(( ${i} + ${page_size} + 1 ))

        # break if reached last action
        if [ "${page_size}" -gt "${page_count}" ]; then
            break
        fi
    done
}

# iterate over accounts to track with their respective jq expressions
for arg in $(echo "${TRACK_ACCOUNTS}" | jq -r '.[] | @base64')
do
    # use base64 to avoid issues with \n and ' '
    _jq() {
        echo ${arg} | base64 --decode | jq -r ${1}
    }

    # init. params
    account=$(_jq '.account_name')
    jqexpr=$(_jq '.jq_expression')

    # init. files
    if [ ! -f ${NOTIF_EOS_PATH}/.notif_${account} ]; then
        touch ${NOTIF_EOS_PATH}/.notif_${account}
    fi
    if [ ! -f ${NOTIF_EOS_PATH}/.count_${account} ]; then
        echo 0 > ${NOTIF_EOS_PATH}/.count_${account}
    fi

    # grab them again
    notif_eos ${account} ${jqexpr} > ${NOTIF_EOS_PATH}/.notif_${account}

    # count them
    old_count=$(< ${NOTIF_EOS_PATH}/.count_${account})
    new_count=$(wc -l < ${NOTIF_EOS_PATH}/.notif_${account})

    # send message if there are new notifications
    if [ ${new_count} -gt ${old_count} ]; then
        new_msg_amnt=$(( ${new_count} - ${old_count} ))
        message=$(tail -n ${new_msg_amnt} < ${NOTIF_EOS_PATH}/.notif_${account})

        if [ ${old_count} -gt 0 ]; then
            notif_msg "${message}"
        fi

        # store new count
        echo ${new_count} > ${NOTIF_EOS_PATH}/.count_${account}
    fi
done