# UNIX statbot script. written Warren Kibbe, 1996
# 	WAKibbe@nwu.edu
#
# version 1.0 release 2
# Changes 4/20/96. 
# - Script is no longer path dependent.
# - Script also checks the actual identity of the log
#	files using bdiff to verify that the log data is the same
#	in the existing ("old") log file and the new log file. The
#	old method relied solely on the size of the files in blocks.
#
# change these variables to use in your statbot log!
#
# NOTE: Script and logs must be kept in the same directory!
#
# To start this script, type "sh 'scriptname'" from your login shell
# To view the schedule of the script, type "at -l"
# To delete a scheduled script, type "at -r 'scriptid'"
# 
# ******* VARIABLES *******

mailbox="wak@nwu.edu" 	#destination for notifications
scriptname="statbot.script"	#name of the script file
permlogfile="oldlog"	#this is where the permanent log is kept
logfilename="dailylog"  	#this is where the daily log file is kept
path="/users/wakibbe/stats/"	# makes the script run from directories 
			# other than root (login)
newlogfile="templog"   


# ********* Main Body of Script **********

now=`date`
exec > /dev/null 2>&1  #this routes all messages into 'nothing'
cd $path

pwd

oldlogfile=$logfilename 

# messages from "grablog" and "statbot" are routed to null (trash)
# replace with pipe to email if you want the output

/users/pib/bin/grablog > "$newlogfile"  2> /dev/null
/users/pib/statbot/statbot > /dev/null 2>&1

# schedule next run depending on the time of day
# currently set to run hourly from 10am to 7pm, and at 11 pm.

currenttime=`date +'%H'`
currentmin=`date +'%M'`
if [ $currenttime -lt 10 ]
then
  nexttime="10:$currentmin"
else
  if [ $currenttime -lt 19 ]
  then
    nexttime="now +1 hour"
  else 
    if [ $currenttime -lt 23 ]
    then
      nexttime="23:$currentmin"
    else
      nexttime="10:$currentmin"
    fi
  fi
fi

# to run script ever hour regardless of time of day, remove the "#" from 
# the next line

# nexttime="10:$currentmin"

at  $nexttime < $path$scriptname 

#example alternative pipe to at (crontab is disabled at pubweb workstations)
# echo "sh $path$scriptname >/dev/null 2>&1" | at $nexttime 

temp="Made the file $newlogfile"
temp=$temp"\nExisting File: $oldlogfile "
temp=$temp"\nlog grabbed at $now"

echo $oldlogfile
if [ ! -r $oldlogfile ] 
then
  echo "Made it inside oldlogfile  test"
  cat /dev/null > $oldlogfile
fi


if [ ! -w $permlogfile ] 
then
  echo "Made it inside permlogfile  test"
  cat /dev/null > $permlogfile
fi

#get the actual changed line count

difflines=`bdiff $newlogfile $oldlogfile | wc -l`
wc -l $newlogfile > temp1
newloglines=`cut -f1 -d" " temp1`
wc -l $oldlogfile > temp1
oldloglines=`cut -f1 -d" " temp1`
calcdiff=` expr "$newloglines" - $oldloglines"` 

#this piping method does not work from a batch!
#oldloglines=`more $oldlogfile | wc -l`

temp=$temp"\nChecking site access stats:"
temp=$temp"\n\tLines that differ between current and new logs: $difflines "
temp=$temp"\n\tLines in the new log:  $newloglines "
temp=$temp"\n\tLines in the old log:  $oldloglines"
temp=$temp"\n\tCalculated difference: $calcdiff"

echo $temp

if [ "0$difflines" -ge "0$newloglines" ]
then
  # If difflines is greater than or equal to the number of lines in the newlog
  # then concatenate the permanent log file and the old log file
  # can't do this in one call, since cat overwrites destination
    echo "executing diflines test"

if [ "0$oldloglines" -gt "0" ]
then
  cat $permlogfile $oldlogfile > log.temp
  mv log.temp $permlogfile  

  # send notification that the old log file was appended

  temp=$temp"\nappending old log to $permlogfile "
  temp=$temp"\nnumber of lines appended=$oldloglines"
  temp=$temp"\nScript will be run again at $nexttime"
  echo $temp | mail $mailbox

  # take the IP numbers out of the old log file and email them to your mailbox
  cut -f1 -d" " $oldlogfile > visitor.ip
  mail $mailbox < visitor.ip
  echo "executing concatenation"
fi

# end if oldloglines less than 1 

else

  # If the new file is contains the old log, simply rename
  temp=$temp"\nNew log renamed to $logfilename"
  temp=$temp"\nScript will be run again at $nexttime"

  #comment this out to be notified every time script runs

  #echo $temp | mail $mailbox
  echo "executing rename file"
fi 
  # end if difflines greater than lines in the new log

# Final action: 
#	take the new log file and change it to the name of the oldlogfile
#       This will overwrite the existing log file if it hasn't been added
#	to the permanent log file.

mv $newlogfile $logfilename

echo "finished with script"