#!/bin/bash
# Tries a friendly OSGi shutdown first and waits for the process to disappear.
# If this doesn't happen within a timeout perior, a SIGTERM is sent to the process.
# If this doesn't make the process disappear within another timeout, SIGKILL is sent.
# This script then waits another while for the process to disappear.
# Returns 0 if stopping the process succeeded within the timeout periods, 1 otherwise.

. `pwd`/env.sh

if [[ `uname` != "Darwin" ]]; then
    TELNET_ACTIVE=`netstat -tlnp 2>/dev/null | grep ":$TELNET_PORT"`
else
    TELNET_ACTIVE=`netstat -an 2>/dev/null | grep ".$TELNET_PORT"`
fi

if [[ $TELNET_PORT == "" ]] || [[ $TELNET_ACTIVE == "" ]]; then
        echo "Could not find server on telnet port $TELNET_PORT. Perhaps server is not running?"
        if [[ $SERVER_STARTUP_NOTIFY != "" ]]; then
            echo "Stopped" | mail -r noreply@sapsailing.com -s "Server $SERVER_NAME could not be stopped!" $SERVER_STARTUP_NOTIFY
        fi
else
    TN_CMD="telnet 127.0.0.1 $TELNET_PORT"
    { echo "shutdown"; sleep 5; } | $TN_CMD

    echo "Stopped server $SERVER_NAME"
    if [[ $SERVER_STARTUP_NOTIFY != "" ]]; then
        echo "OK" | mail -r noreply@sapsailing.com -s "Server $SERVER_NAME stopped successfully!" $SERVER_STARTUP_NOTIFY
    fi
fi

# Wait for server to die; if it doesn't, kill it after a timeout
KILL_TIMEOUT_IN_SECONDS=30
SERVER_PID=`cat server.pid`
seconds_counter=$KILL_TIMEOUT_IN_SECONDS
while ((seconds_counter-- != 0)); do
  if [ ! -d /proc/$SERVER_PID ]; then
    echo "Server successfully and gracefully stopped by OSGi shutdown command."
    rm server.pid
    exit 0
  fi
  sleep 1
done
echo "Server process $SERVER_PID didn't die within ${KILL_TIMEOUT_IN_SECONDS}s after sending it the shutdown command. Killing..."
kill $SERVER_PID
TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR=120
seconds_counter=$TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR
echo "Waiting up to ${TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR}s for server process $SERVER_PID to disappear..."
while ((seconds_counter-- != 0)); do
  if [ ! -d /proc/$SERVER_PID ]; then
    echo "Server process $SERVER_PID disappeared after killing it. This took $(($TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR-$seconds_counter))s."
    rm server.pid
    exit 0
  fi
  sleep 1
done
echo "Server process $SERVER_PID did not die or disappear after SIGTERM. Trying SIGKILL..."
kill -9 $SERVER_PID
seconds_counter=$TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR
echo "Waiting up to ${TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR}s for server process $SERVER_PID to disappear after kill -SIGKILL..."
while ((seconds_counter-- != 0)); do
  if [ ! -d /proc/$SERVER_PID ]; then
    echo "Server process $SERVER_PID disappeared after killing it with SIGKILL. This took $(($TIMEOUT_FOR_KILLED_PROCESS_TO_DISAPPEAR-$seconds_counter))s."
    rm server.pid
    exit 0
  fi
  sleep 1
done
echo "Server process $SERVER_PID did not die or disappear after SIGKILL either. Out of options."
exit 1
rm server.pid