#!/bin/sh
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Template from /etc/init.d/skeleton on Ubuntu
#
### BEGIN INIT INFO
# Provides:          Traffic Server
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: Startup/shutdown script for the Apache Traffic Server
# Description:       Apache Traffic Server is fast, scalable and extensible
#                    HTTP/1.1 compliant caching proxy server.
### END INIT INFO

# Fedora:
#  When this file is installed as /etc/rc.d/init.d/trafficserver
#  and added to the chkconfig system with `chkconfig --add trafficserver`
#  then the default values of these variables can be overridden
#  in the /etc/sysconfig/trafficserver file
# Ubuntu:
#  Values read from /etc/default/trafficserver

TS_PACKAGE_NAME="@PACKAGE_NAME@"
TS_PACKAGE_VERSION="@PACKAGE_VERSION@"
TS_PACKAGE_BUGREPORT="@PACKAGE_BUGREPORT@"

if [ -e /etc/SuSE-release ]; then
  DISTRIB_ID="suse"
elif [ -e /etc/fedora-release ]; then
  DISTRIB_ID="fedora"
elif [ -e /etc/redhat-release ]; then
  DISTRIB_ID="redhat" # also exists on Fedora
elif [ -e /etc/lsb-release ]; then
  DISTRIB_ID="ubuntu"
elif [ -e /etc/debian_version ]; then
  DISTRIB_ID="debian" # also exists on Ubuntu
elif [ -e /etc/slackware-version ]; then
  DISTRIB_ID="slackware"
fi

# /usr/bin/lsb_release -rd # Ubuntu release & description info

HEAD=/usr/bin/head
test -x $HEAD || HEAD=head
ESED=/usr/bin/sed
test -x $ESED || ESED=sed

# Ubuntu: Do NOT "set -e"

#Ubuntu:PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/usr/sbin:/usr/bin:/sbin:/bin
DESC="start/stop Traffic Server"
NAME=trafficserver
TS_PREFIX="@prefix@"

TS_ROOT=${TS_ROOT:-$TS_PREFIX}
# TS_BASE is offset inside the file system from where the layout starts
# For standard installations TS_BASE will be empty
eval TS_BASE="`echo $TS_ROOT | ${ESED} -e 's;@prefix@$;;'`"

TC_NAME=${TC_NAME:-traffic_cop}
TM_NAME=${TM_NAME:-traffic_manager}
TS_NAME=${TS_NAME:-traffic_server}
TC_DAEMON=${TC_DAEMON:-$TS_BASE@exp_bindir@/traffic_cop}
TC_DAEMON_ARGS=""
TM_DAEMON=${TM_DAEMON:-$TS_BASE@exp_bindir@/traffic_manager}
TM_DAEMON_ARGS=""
TS_DAEMON=${TS_DAEMON:-$TS_BASE@exp_bindir@/traffic_server}
TS_DAEMON_ARGS=""
TC_PIDFILE=${TC_PIDFILE:-$TS_BASE@exp_runtimedir@/cop.lock}
TM_PIDFILE=${TM_PIDFILE:-$TS_BASE@exp_runtimedir@/manager.lock}
TS_PIDFILE=${TS_PIDFILE:-$TS_BASE@exp_runtimedir@/server.lock}
# number of times to retry check on pid lock file
PIDFILE_CHECK_RETRIES=${PIDFILE_CHECK_RETRIES:-30}
# stdout file of executable
STDOUTLOG=${STDOUTLOG:-$TS_BASE@exp_logdir@/traffic_server.stdout}
# stderr file of executable
STDERRLOG=${STDERRLOG:-$TS_BASE@exp_logdir@/traffic_server.stderr}
if [ -d /etc/rc.d/init.d ]; then
  SCRIPTNAME=/etc/rc.d/init.d/$NAME # Fedora
elif [ -d /etc/init.d ]; then
  SCRIPTNAME=/etc/init.d/$NAME # Ubuntu
else
  echo "This script needs to be ported to this OS"
  exit 1
fi


# Exit if the package can not be found
if [ ! -x "$TS_DAEMON" ]; then
  echo "Error: Can not find $TS_DAEMON using TS_ROOT=$TS_ROOT"
  echo "       Please set TS_ROOT to point to base installation."
  exit 0
fi

# Ubuntu: Read configuration variable file if it is present
test -r /etc/default/$NAME && . /etc/default/$NAME

# Ubuntu: Load the VERBOSE setting and other rcS variables
test -f /etc/default/rcS && . /etc/default/rcS

# Suse: load rc.status
test -f /etc/rc.status && . /etc/rc.status

# Fedora: make avail helper functions 'action', 'killproc', 'status', etc
test -f /etc/rc.d/init.d/functions && . /etc/rc.d/init.d/functions

# Ubuntu: Define LSB log_* functions.
#         Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
test -f /lib/lsb/init-functions && . /lib/lsb/init-functions


#
# Fedora:
#  launches $* in the background
#  and checks if program creates its own pid lock file
#  redirects stdout and stderr to files
#  this function is meant to substitute 'daemon'
#  because 'daemon' expects $1 to fork itself
forkdaemon()
{
  local i=0

  # launch in background, i.e. fork
  # and redirect stdout and stderr to files
  $* >> $STDOUTLOG 2>> $STDERRLOG &

  while (( $i < $PIDFILE_CHECK_RETRIES ))
  do

    # check for regular file and size greater than 0
    if [[ -f $TC_PIDFILE ]] && [[ -s $TC_PIDFILE ]]
    then
      success
      return 0
    fi

    sleep 1  # zzz for 1 second
    (( i++ ))

  done

  failure
  return 1
}


#
# Ubuntu: Function that starts the daemon/service
#
do_start()
{
  # Return
  #   0 if daemon has been started
  #   1 if daemon was already running
  #   2 if daemon could not be started
  start-stop-daemon --start --background --quiet --pidfile $TC_PIDFILE --exec $TC_DAEMON --test > /dev/null \
    || return 1
  start-stop-daemon --start --background --quiet --pidfile $TC_PIDFILE --exec $TC_DAEMON -- \
    $TC_DAEMON_ARGS \
    || return 2
  # Add code here, if necessary, that waits for the process to be ready
  # to handle requests from services started subsequently which depend
  # on this one.  As a last resort, sleep for some time.
}

#
# Ubuntu: Function that stops the daemon/service
#
do_stop()
{
  # Return
  #   0 if daemon has been stopped
  #   1 if daemon was already stopped
  #   2 if daemon could not be stopped
  #   other if a failure occurred
  start-stop-daemon --stop --quiet --retry=QUIT/30/KILL/5 --pidfile $TC_PIDFILE --name $TC_NAME
  RETVAL="$?"
  test "$RETVAL" = 2 && return 2
  # Wait for children to finish too if this is a daemon that forks
  # and if the daemon is only ever run from this initscript.
  # If the above conditions are not satisfied then add some other code
  # that waits for the process to drop all resources that could be
  # needed by services started subsequently.  A last resort is to
  # sleep for some time.
  start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $TC_DAEMON
  test "$?" = 2 && return 2
        # Need to stop the TM and TS also
  start-stop-daemon --stop --quiet --retry=QUIT/30/KILL/5 --pidfile $TM_PIDFILE --name $TM_NAME
  test "$?" = 2 && return 2
  start-stop-daemon --stop --quiet --retry=QUIT/30/KILL/5 --pidfile $TS_PIDFILE --name $TS_NAME
  test "$?" = 2 && return 2
  # Many daemons don't delete their pidfiles when they exit.
  rm -f $TC_PIDFILE
  rm -f $TM_PIDFILE
  rm -f $TS_PIDFILE
  return "$RETVAL"
}

#
# Ubuntu: Function that sends a SIGHUP to the daemon/service
#
do_reload()
{
  #
  # If the daemon can reload its configuration without
  # restarting (for example, when it is sent a SIGHUP),
  # then implement that here.
  #
  start-stop-daemon --stop --signal 1 --quiet --pidfile $TS_PIDFILE --name $TS_NAME
  return 0
}



# main
case "$1" in
  start)
    if [ "$DISTRIB_ID" = "ubuntu" -o "$DISTRIB_ID" = "debian" ] ; then
      test "x$VERBOSE" != "xno" && log_daemon_msg "Starting $DESC" "$NAME"
      do_start
      case "$?" in
        0|1)
          test "$VERBOSE" != no && log_end_msg 0
        ;;
        2)
          test "$VERBOSE" != no && log_end_msg 1
        ;;
      esac
    elif [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
      action "Starting ${TS_PACKAGE_NAME}:" forkdaemon $TC_DAEMON $TC_DAEMON_ARGS
    elif [ "$DISTRIB_ID" = "suse" ]; then
      echo -n "Starting ${TS_PACKAGE_NAME}"
      startproc -p $TC_PIDFILE $TC_DAEMON $TC_DAEMON_ARGS
      rc_status -v
    else
        echo "This script needs to be ported to this OS"
        exit 1
    fi
  ;;
  stop)
    if [ "$DISTRIB_ID" = "ubuntu" -o "$DISTRIB_ID" = "debian" ] ; then
      test "x$VERBOSE" != "xno" && log_daemon_msg "Stopping $DESC" "$NAME"
      do_stop
      case "$?" in
        0|1)
          test "x$VERBOSE" != "xno" && log_end_msg 0
        ;;
        2)
          test "x$VERBOSE" != "xno" && log_end_msg 1
        ;;
      esac
    elif [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
      action "Stopping ${TC_NAME}:" killproc -p $TC_PIDFILE $TC_DAEMON
      action "Stopping ${TM_NAME}:" killproc -p $TM_PIDFILE $TM_DAEMON
      action "Stopping ${TS_NAME}:" killproc -p $TS_PIDFILE $TS_DAEMON
    elif [ "$DISTRIB_ID" = "suse" ]; then
      echo -n "Stopping ${TC_NAME}"
      killproc -p $TC_PIDFILE $TC_DAEMON
      rc_status -v
      echo -n "Stopping ${TM_NAME}"
      killproc -p $TM_PIDFILE $TM_DAEMON
      rc_status -v
      echo -n "Stopping ${TS_NAME}"
      killproc -p $TS_PIDFILE $TS_DAEMON
      rc_status -v
    else
      echo "This script needs to be ported to this OS"
      exit 1
    fi
  ;;
  #reload|force-reload)
  #
  # If do_reload() is not implemented then leave this commented out
  # and leave 'force-reload' as an alias for 'restart'.
  #
  #log_daemon_msg "Reloading $DESC" "$NAME"
  #do_reload
  #log_end_msg $?
  #;;
  restart|force-reload)
    if [ "$DISTRIB_ID" = "ubuntu" -o "$DISTRIB_ID" = "debian" ] ; then
      #
      # If the "reload" option is implemented then remove the
      # 'force-reload' alias
      #
      log_daemon_msg "Restarting $DESC" "$NAME"
      do_stop
      case "$?" in
          0|1)
            do_start
            case "$?" in
              0) log_end_msg 0 ;;
              1) log_end_msg 1 ;; # Old process is still running
              *) log_end_msg 1 ;; # Failed to start
            esac
          ;;
          *)
            # Failed to stop
            log_end_msg 1
          ;;
      esac
    else
      # This is the typical process for restart
      $0 'stop'
      $0 'start'
    fi
  ;;
  status)
    if [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
      status -p $TC_PIDFILE $TC_NAME
    elif [  "$DISTRIB_ID" = "suse" ]; then
      echo -n "Checking for service ${DM}: "
      checkproc -p $TC_PIDFILE $TC_NAME
      rc_status -v
    else
      echo "This script needs to be ported to this OS"
      exit 1
    fi
  ;;
  condrestart)
    if [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
      if ! $0 'status'
      then
        $0 'stop'
        $0 'start'
      fi
    else
      echo "This script needs to be ported to this OS"
      exit 1
    fi
  ;;
  *)
    if [ "$DISTRIB_ID" = "ubuntu" -o "$DISTRIB_ID" = "debian" ] ; then
      echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
    elif [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
      echo "Usage: $0 {start|stop|status|restart|condrestart}"
    elif [ "$DISTRIB_ID" = "suse" ]; then
      echo "Usage: $0 {start|stop|restart|status}"
    else
      echo "This script needs to be ported to this OS"
      exit 1
    fi
    exit 3
  ;;
esac