#!/bin/bash
# 
# Waiting until synchronized lsyncd
#set -x
export LANG=en_EN.UTF-8
export PATH=/sbin:/bin:/usr/sbin:/usr/bin

[[ -z $DEBUG ]] && DEBUG=0
TMP_DIR=/opt/webdir/tmp
[[ ! -d $TMP_DIR ]] && mkdir -m 700 $TMP_DIR
LOG_FILE=$TMP_DIR/bx_lsyncd_wait_$$.log

debug(){
    mess=$1

    [[ $DEBUG -gt 0 ]] && echo "$(date +%s) $mess" >> $LOG_FILE
}

notify(){
    msg="${1}"
    err="${2:-0}"

    json="\"msg\":\"$msg\","
    json=$json"\"changed:\":false"
    [[ $err -gt 0 ]] && json=$json",\"failed\":true"

    echo "{$json}"
    exit $err
}

test_log(){
    if [[ ! -f $log ]]; then
        return 1
    fi
    return 0
}

get_variables(){

    [[ -z $timeout ]] && timeout=30
    [[ -z $attempts ]] && attempts=10
    [[ -z $log ]] && notify "You must define lsynd log=/path/to/log" 1
}

get_delay(){
    ( egrep -o '[0-9]+ delays' $log 2>/dev/null || echo 9999 ) | \
        awk 'BEGIN{total=0}{total+=$1}END{print total}'
}

lsyncd_wait(){
    step=0

    # test file exists
    file_exists=0
    while [[ ( $file_exists -eq 0 ) && ( $step -lt $attempts  ) ]]; do
        test_log
        if [[ $? -eq 0 ]]; then
            file_exists=1
        fi
        step=$(( $step+1 ))
        sleep $timeout
    done
    if [[ $file_exists -eq 0 ]]; then
        notify "Not found log file=$log"
    fi

    # test timeout
    step=0
    delay=$(get_delay)
    while [[ ( $delay -gt 0 ) && ( $step -lt $attempts ) ]]; do
        sleep $timeout
        delay=$(get_delay)
        step=$(( $step+1 ))
    done

    if [[ $delay -gt 0 ]]; then
        notify "Lsyncd-synchronization was not completed in the allotted time" 1
    fi

    notify "Lsyncd-synchronization was completed"
}

source ${1}

get_variables

lsyncd_wait