login_manager/init/scripts/send-uptime-metrics

#!/bin/sh

# Copyright 2016 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

set -e

# Records the difference between two timestamps in milliseconds.
# Only emits metrics if none of the three arguments are empty.
# Arguments are <starting point> <ending point> <metric name>
record_delta() {
  if [ $# -eq 3 ] && [ -n "$1" ] && [ -n "$2" ] && [ -n "$3" ]; then
    metrics_client "$3" $(($2 - $1)) 1 1000000 50
  fi
}

# logout-started signal is written asynchronously after Chrome starts.
# Wait for new signal to appear for 10 seconds.
FLAG_FILE=/tmp/stats-logout-started.written
for i in $(seq 10) ; do
  if mv -f "${FLAG_FILE}" "${FLAG_FILE}".done 2> /dev/null ; then
    FOUND=true
    break;
  fi
  sleep 1
  if [ "${i}" = 10 ]; then
    logger -i -p crit "No new logout-started signal received after" \
    " 10 seconds."
  fi
done

# Report infinite value when there was no recent logout-started.
# Max histograms value is 1000000ms, which is calculated from the
# device uptime. Set "impossible" start value to -1000000 to force
# out-of-bounds histogram result.
if [ -z "${FOUND}" ] ; then
  CHROME_LOGOUT_STARTED=-1000000
else
  CHROME_LOGOUT_STARTED=$(bootstat_get_last logout-started time-ms)
fi

# Only record restart statistics if chrome performed a logout.
if [ -n "${CHROME_LOGOUT_STARTED}" ]; then
  CHROME_UI_POST_STOP=$(bootstat_get_last ui-post-stop time-ms)
  CHROME_PROCESSES_TERMINATED=$(bootstat_get_last \
                                other-processes-terminated time-ms)
  # Stub this out since X no longer exists, but the stats below are
  # defined as transitions to/from the X kill phase.
  CHROME_CRYPTOHOME_UNMOUNTED=$(bootstat_get_last \
                                cryptohome-unmounted time-ms)
  CHROME_EXEC=$(bootstat_get_last chrome-exec time-ms)
  CHROME_LOGIN_PROMPT_VISIBLE=$(bootstat_get_last \
                                login-prompt-visible time-ms)

  # Record deltas between some interesting steps.
  record_delta "${CHROME_LOGOUT_STARTED}" "${CHROME_UI_POST_STOP}" \
               Uptime.LogoutToUIStopAfterLogout

  record_delta "${CHROME_UI_POST_STOP}" "${CHROME_PROCESSES_TERMINATED}" \
               Uptime.UIStopToProcessesTerminatedAfterLogout

  record_delta "${CHROME_PROCESSES_TERMINATED}" "${CHROME_EXEC}" \
               Uptime.OtherProcessesTerminatedToChromeExecAfterLogout

  record_delta "${CHROME_EXEC}" "${CHROME_LOGIN_PROMPT_VISIBLE}" \
               Uptime.ChromeExecToLoginPromptVisibleAfterLogout

  # Some summary statistics so we can account for everything.
  record_delta "${CHROME_LOGOUT_STARTED}" "${CHROME_CRYPTOHOME_UNMOUNTED}" \
               Uptime.Logout

  record_delta "${CHROME_CRYPTOHOME_UNMOUNTED}" \
               "${CHROME_LOGIN_PROMPT_VISIBLE}" \
               Uptime.LoginPromptSetupTimeAfterLogout

  record_delta "${CHROME_LOGOUT_STARTED}" "${CHROME_LOGIN_PROMPT_VISIBLE}" \
               Uptime.LogoutToLoginPromptVisible
fi