#/bin/bash

if [ -z "$1" ]; then
  echo "Missing Server Configuration File"
  exit 1
fi

if [ "$1" == "--help" ]; then
  echo "usage:  "
  echo "remoteMonitors <Configfile> <action>"
  echo "<action> can be start, stop, or check"
  echo "start starts the monitors"
  echo "stop stops running monitors"
  echo "check shows status of monitors"
  echo
  echo "each line within the config file has to be in format"
  echo "<kind> <name> <server> <port> <cores> <config> [<home> [<user>]]"
  echo
  echo "<kind>   : one of MASTER or WORKER , lines starting with another token are ignored"
  echo "<name>   : a nice name for the server used by SecondoREPLAY"
  echo "<server> : the host name at that the monitor should run"
  echo "<port>   : the port for the monitors, overwrites the setting in SecondoConfig.ini"
  echo "<cores>  : number of cores, used by SecondoREPLAY only"
  echo "<config> : configuration file to use, must be exist on server side"
  echo "<home> : overwrite the database directory specified in the configuration file"
  echo "         if not used, but later arguments should be set, use a dollar sign "
  echo "         as place holder"
  echo "         if not used, but later arguments should be set, use a dollar sign "
  echo "         as place holder"
  echo "<user> : user which performs the command on the remote machine"
  exit
fi

if [ -z "$2" ]; then
  echo "start, stop, or check as second parameter missing "
  exit 1;
fi

config=$1
action=$2

if [ $action != start ]; then
  if [ $action != stop ]; then
    if [ $action != check ]; then
      echo "invalid action"
      echo allowed are start, stop, and check
      exit 1
    fi
  fi
fi
  


function startLine {

  if [ -z "$1" ]; then  # empty line
    return
  fi
  kind=$1
  if [ "$kind" != "MASTER" ]; then
     if [ "$kind" != "WORKER" ]; then
        return
     fi
  fi
  if [ -z "$6" ]; then # at least 6 arguments are required 
    echo "invalid format in line" $*
    return
  fi

  server=$3
  port=$4
  config=$6

  if [ -n "$7" ]; then
    if [ "$7" != "$" ]; then
        home="-d $7"
    fi
  fi

  if [ -n "$8" ]; then
    user="$8@"
  fi

  script=runMonitortemp.sh
  echo 'cd $HOME/secondo/bin' >$script
  echo 'source $HOME/.secondorc' >> $script
  echo export SECONDO_CONFIG=$config >>$script
  echo 'if [ ! -e $SECONDO_CONFIG ]; then' >>$script
  echo ' echo configuration file $SECONDO_CONFIG not found an server ' $server >>$script
  echo ' exit' >>$script
  echo 'fi' >>$script
  if [ -z "$port" ]; then
     echo 'port=$(grep ^SecondoPort ${SECONDO_CONFIG} | sed -e "s@SecondoPort=@@g" | sed -e "s@\s@@g")' >>$script
  else 
     echo port=$port >>$script
  fi
  echo 'if [ -z "$TMPDIR" ]; then' >>$script
  echo '  export TMPDIR=/tmp' >>$script
  echo 'fi' >>$script
  echo 'tmpfile="$TMPDIR/SM_${port}.lck"'  >>$script
  echo 'if [ -e $tmpfile ]; then' >>$script
  echo 'echo "SecondoMonitor already running on port ${port}"'  >>$script
  echo 'exit 1' >>$script
  echo 'fi'  >>$script
  echo "nohup ./SecondoMonitor -s $home -p $port -c $config >SecondoMonitor.log "'2>&1 &' >>$script
  echo 'pid=$!' >>$script
  echo 'echo $pid >$tmpfile' >>$script
  echo 'w=$(ps -p $pid | wc -l )' >>$script
  echo 'if [ "$w" == "2" ]; then' >>$script
  echo '  echo Monitor is running now at port $port' >>$script
  echo 'else' >>$script
  echo '  echo Could not start Monitor on port $port' >> $script
  echo '  rm $tmpfile' >>$script
  echo 'fi' >> $script
  echo Try to start monitor on server $server
  ssh $user$server 'bash -s' <$script
  rm $script
}


function stopLine {
  
  if [ -z "$1" ]; then  # empty line
    return
  fi
  kind=$1
  if [ "$kind" != "MASTER" ]; then
     if [ "$kind" != "WORKER" ]; then
        return
     fi
  fi
  if [ -z "$6" ]; then # at least 6 arguments are required 
    echo "invalid format in line" $*
    return
  fi

  server=$3
  port=$4
  config=$6

  if [ -n "$7" ]; then
    if [ "$7" != "$" ]; then
        home="-d $7"
    fi
  fi

  if [ -n "$8" ]; then
    user="$8@"
  fi


  script=stopMonitortemp.sh
  echo 'cd $HOME/secondo/bin' >$script
  echo export SECONDO_CONFIG=$config >>$script
  echo 'if [ ! -e $SECONDO_CONFIG ]; then' >>$script
  echo ' echo configuration file $SECONDO_CONFIG not found an server ' $server >>$script
  echo ' exit' >>$script
  echo 'fi' >>$script
  if [ -z "$port" ]; then
     echo 'port=$(grep ^SecondoPort ${SECONDO_CONFIG} | sed -e "s@SecondoPort=@@g" | sed -e "s@\s@@g")' >>$script
  else 
     echo port=$port >>$script
  fi
  echo 'if [ -z "$TMPDIR" ]; then' >>$script
  echo '  export TMPDIR=/tmp' >>$script
  echo 'fi' >>$script
  echo 'tmpfile="$TMPDIR/SM_${port}.lck"'  >>$script
  echo 'if [ ! -e $tmpfile ]; then' >>$script
  echo 'echo "SecondoMonitor not running on port ${port}"'  >>$script
  echo 'exit 1' >>$script
  echo 'fi'  >>$script
  echo 'pid=$(cat $tmpfile)' >>$script
  echo 'gid=$(ps -p $pid -o pgid | sed -e "s@[a-zA-Z]@@g" )' >>$script
  echo 'gid=$(echo $gid | sed -e "s@\s@@g")' >>$script
  echo 'if [ -n "$gid" ]; then' >>$script
  echo 'kill -9 -$gid' >>$script
  echo 'fi' >>$script
  echo 'rm $tmpfile' >>$script
  echo Try to stop monitor on server $server
  ssh $user$server 'bash -s' <$script
  rm $script
}


function checkLine {
  

  if [ -z "$1" ]; then  # empty line
    return
  fi
  kind=$1
  if [ "$kind" != "MASTER" ]; then
     if [ "$kind" != "WORKER" ]; then
        return
     fi
  fi
  if [ -z "$6" ]; then # at least 6 arguments are required 
    echo "invalid format in line" $*
    return
  fi

  server=$3
  port=$4
  config=$6

  if [ -n "$7" ]; then
    if [ "$7" != "$" ]; then
        home="-d $7"
    fi
  fi

  if [ -n "$8" ]; then
    user="$8@"
  fi


  script=checkMonitortemp.sh
  echo 'cd $HOME/secondo/bin' >$script
  echo export SECONDO_CONFIG=$config >>$script
  echo 'if [ ! -e $SECONDO_CONFIG ]; then' >>$script
  echo ' echo configuration file $SECONDO_CONFIG not found on server ' $server >>$script
  echo ' exit' >>$script
  echo 'fi' >>$script
  if [ -z "$port" ]; then
     echo 'port=$(grep ^SecondoPort ${SECONDO_CONFIG} | sed -e "s@SecondoPort=@@g" | sed -e "s@\s@@g")' >>$script
  else 
     echo port=$port >>$script
  fi
  echo 'if [ -z "$TMPDIR" ]; then' >>$script
  echo '  export TMPDIR=/tmp' >>$script
  echo 'fi' >>$script
  echo 'tmpfile="$TMPDIR/SM_${port}.lck"'  >>$script
  echo 'if [ ! -e $tmpfile ]; then' >>$script
  echo 'echo "SecondoMonitor not running on port ${port}  at " ' $server  >>$script
  echo 'exit 1' >>$script
  echo 'fi'  >>$script
  echo 'pid=$(cat $tmpfile)' >>$script
  echo 'x=$(ps -p $pid | wc -l)' >>$script
  echo 'if [ "$x" == "2" ]; then ' >>$script
  echo '  echo Monitor is running on port $port at ' $server >> $script
  echo "else " >>$script
  echo "  echo Monitor should run but is not active, delete runnning marker" >> $script
  echo '  rm $tmpfile' >>$script
  echo "fi" >>$script
  echo Try to check monitor on server $server
  ssh $user$server 'bash -s' <$script
  rm $script
}


if [ $action == start ]; then
   while read line; do startLine $line ;done <$1
else
  if [ $action == stop ]; then
     while read line; do stopLine $line ;done <$1
  else
     while read line; do checkLine $line ;done <$1
  fi
fi