#/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 "update updates secondo on remote server via CVS"
  echo "createHomes creates secondo database directories on remote computers"
  echo "copycfg copies configuration files to remote computers"
  echo
  echo "each line within the config file has to be in format"
  echo "<server> <config> [<bin> [<home> [<port> [<user>]]]]"
  echo ""
  echo "<server> : the host name at that the monitor should run"
  echo "<bin>    : the bin directory of the Secondo to be started"
  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 "<port>   : overwrite the monitor port specified in the configuration file"
  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 "second parameter missing "
  exit 1;
fi

config=$1
action=$2

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

function createHomesLine {
  if [ -z "$1" ]; then  # empty line
    return
  fi
  server=$1
  home=$4
  if [ -z "$home" ]; then
     echo "no home specified for server $server"
     return
  fi
  if [ -n "$6" ]; then
    user="$6@"
  fi
  ssh "$user$server mkdir -p $home"
}

  
function copyConfigLine {

  if [ -z "$1" ]; then  # empty line
    return
  fi
  server=$1
  cfg=$2
  bin=$3
  if [ -z "$bin" ]; then
     echo "no bin directory specified for server $server"
     return
  fi
  if [ -n "$6" ]; then
    user="$6@"
  fi
  scp $cfg $user$server:$bin
}



# global variable holding server values 
# to avoid multiple update on a single server
usedServers=""

function updateLine {
  if [ -z "$1" ]; then  # empty line
    return
  fi

  server=$1
  if [ -n "$6" ]; then
    user="$6@"
  fi

  secBin=$3; 



  # check whether server was already updatet
  if [[ $usedServers == *"$server"* ]]; then
    echo "Server $server already processed"
    return
  fi
  echo "update server $server"

  usedServers="$usedServers $server"


  if [ -z "$3" ]; then   
     remotedir=$(ssh "$user$server" 'source $HOME/.bashrc; echo $SECONDO_BUILD_DIR')
  else 
     remotedir=$3
  fi

  echo "remote SECONDO_BUILD_DIR= $remotedir"

  if [ -z "$remotedir" ]; then
    echo "cannot determine SECONDO_BUILD_DIR on server $server"
    return
  fi

  # copy current makefile.algebras to remote server
  scp $SECONDO_BUILD_DIR/makefile.algebras $user$server:$remotedir/

  script=UpdateMonitortemp.sh
  echo 'source $HOME/.bashrc' >$script
  echo "cd $remotedir" >>$script
  echo 'cvs update -PdA' >>$script
  echo 'make' >> $script
  echo >>$script
  ssh $user$server 'bash -s' <$script
  rm $script
  echo "Server $server processed" 
  return 
}



function startLine {

  if [ -z "$1" ]; then  # empty line
    return
  fi
  if [ -z "$2" ]; then  # empty line
    echo "invalid format in line" $*
    return
  fi

  server=$1
  config=$2

  if [ -n "$4" ]; then
    if [ "$4" != "$" ]; then
        home="-d $4"
    fi
  fi
 
  if [ -n "$5" ]; then
    if [ "$5" != "$" ]; then
       port="-p $5"
    fi
  fi

  if [ -n "$6" ]; then
    user="$6@"
  fi

  script=runMonitortemp.sh

  
  if [ -z "$3" ]; then
      echo 'cd $HOME/secondo/bin' >$script
  else 
      echo cd $3 >$script
  fi
  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=$5" >>$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  $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
  if [ -z "$2" ]; then  # at least server and config are required 
    echo "invalid format in line" $*
    return
  fi

  server=$1
  config=$2

  if [ -n "$4" ]; then
    if [ "$4" != "$" ]; then
        home="$-d $4"
    fi
  fi
 
  if [ -n "$5" ]; then
    if [ "$5" != "$" ]; then
       port="-p $5"
    fi
  fi

  if [ -n "$6" ]; then
    user="$6@"
  fi

  script=stopMonitortemp.sh
  if [ -z "$3" ]; then
     echo 'cd $HOME/secondo/bin' >$script
  else 
     echo cd $3 >$script
  fi
  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=$5" >>$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
  if [ -z "$2" ]; then  # at least server and config are required 
    echo "invalid format in line" $*
    return
  fi

  server=$1
  config=$2

  if [ -n "$4" ]; then
    if [ "$4" != "$" ]; then
        home="-d $4"
    fi
  fi
 
  if [ -n "$5" ]; then
    if [ "$5" != "$" ]; then
       port="-p $5"
    fi
  fi
  if [ -n "$6" ]; then
    user="$6@"
  fi

  script=checkMonitortemp.sh
  if [ -z "$3" ]; then
     echo 'cd $HOME/secondo/bin' >$script
  else
     echo cd $3 >$script
  fi
  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=$5" >>$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 copyConfigLine $line; startLine $line ;done <$1
else if [ $action == stop ]; then
   while read line; do stopLine $line ;done <$1
else if [ $action == check ]; then
   while read line; do checkLine $line ;done <$1
else if [ $action == update ]; then 
   while read line; do updateLine $line ;done <$1
else if [ $action == copycfg ]; then 
   while read line; do copyConfigLine $line ;done <$1
else if [ $action == createHomes ]; then 
   while read line; do createHomesLine $line ;done <$1
else
   echo "unknown command"
fi
fi
fi
fi
fi
fi