# file, which when exists, indicates that `master` script has successfully
# completed pre-stop script execution
marker_file="${PRE_STOP_MARKER_FILE:-/var/lib/pre-stop/.termination_marker}"

# file which the running `master` script continuously updates (mtime) to
# indicate it's still running. this file is then read by `watcher`s to
# understand if they still have to wait for `termination_marker`
heartbeat_file="${PRE_STOP_HEARTBEAT_FILE:-/var/lib/pre-stop/.heartbeat}"

# file which:
#   * `watcher`s create when they bail out because they didn't see the
#   `heartbeat_file` to be updated within `$heartbeat_failed_threshold`;
#   * `master` creates when its handler command fails;
# when scripts see such file, they also give up
bailout_file="${PRE_STOP_BAILOUT_FILE:-/var/lib/pre-stop/.bailout}"
heartbeat_threshold="${PRE_STOP_HEARTBEAT_THRESHOLD:-60}"

# where the scripts' stdout/stderr are streamed
stdout="${PRE_STOP_STDOUT:-/proc/1/fd/1}"
stderr="${PRE_STOP_STDERR:-/proc/1/fd/2}"

# command the `master` script executes, which when successfully finishes,
# causes the script to create the `marker_file`
handler="${PRE_STOP_HANDLER:-bash -c \"PYTHONUNBUFFERED=x awx-manage disable_instance --wait --retry=inf\"}"

log_prefix="${PRE_STOP_LOG_PREFIX:-preStop.exec}"
[[ -n ${PRE_STOP_LOG_ROLE} ]] && log_prefix="${log_prefix}] [$PRE_STOP_LOG_ROLE"

# interval at which `watcher`s check for `marker_file` presence
recheck_sleep="${PRE_STOP_RECHECK_SLEEP:-1}"
# interval at which `watcher`s report into $stdout that they are still watching
report_every="${PRE_STOP_REPORT_EVERY:-30}"

function log {
  printf "[%s] $1\n" "$log_prefix" "${@:2}"
}

function parameters_string {
  for param in "$@"; do
    printf "%s=\"%s\"\n" "$param" "${!param}"
  done | paste -s -d ' '
}

function check_bailout {
  if [[ -f $bailout_file ]]; then
    log "\"%s\" file has been detected, accepting bail out signal and failing the hook script" \
      "$bailout_file"
    exit 1
  fi
}

function check_heartbeat {
  if [[ -f $heartbeat_file ]]; then
    delta=$(( $(date +%s) - $(stat -c %Y "$heartbeat_file") ))
  else
    delta=$(( $(date +%s) - $1 ))
  fi

  if [[ $delta -gt $heartbeat_threshold ]]; then
    log "The heartbeat file hasn't been updated since %ss, which is above the threshold of %ds, assuming the master is not operating and failing the hook script" \
      $delta
      $heartbeat_threshold
    touch "$bailout_file"
    exit 1
  fi
}