#!/bin/sh
#
# Originally written by Matthew Evans
# Edited and finalized by Ryan Ticer
#

debug="0"

# SecurScan base directory
ssdir="/cygdrive/c/SecurScan"

# Accounts to check, separated by spaces
accounts=`cd "$ssdir" && find . -maxdepth 1 -type d | egrep -v "^.$|Cache|Log|Sendout|status|Unreturnable" | sed -e 's/.\///g'`

# How many runs of this script should we keep data for and test against
testspan="5"

# If the the current number of files in a directory has grown more than
# $percent percent since $testspan runs ago, we will alert
percent="20"

# Directory to keep our statistics in
statsdir="/var/log/check_caches/"

# Create stats dir if it does not already exist
[ ! -d $statsdir ] && mkdir $statsdir

for account in $accounts
do
        if (( $debug > "0" ))
        then
                echo account $account
        fi
        # Create stats dir for account if it does not already exist
        [ ! -d $statsdir/$account ] && mkdir $statsdir/$account

        for dir in SMTP_Cache Extractor/Cache SASI_Cache
        do
                # Step 1: Gather statistics
                outfile=$statsdir/$account/`echo $dir | sed s+/+_+`
                last_num_files=$( tail -n 1 $outfile )
                find $ssdir/$account/$dir -type f | wc -l >> $outfile
                ### Limit our history to $testspan previous runs
                tail -n $testspan $outfile > $outfile~


                mv $outfile~ $outfile

                # Step 2: Crunch numbers and alert if necessary
                old_num_files=$( head -n 1 $outfile )
                cur_num_files=$( tail -n 1 $outfile )

                if (( $debug > "0" ))
                then
                        echo " dir $dir"
                        echo "  cur_num_files $cur_num_files"
                        echo "  old_num_files $old_num_files"
                        echo "  last_num_files $last_num_files"
                fi

                if (( $cur_num_files > $((last_num_files + (last_num_files * ($percent/100) ))) && $cur_num_files > $((old_num_files + (old_num_files * ($percent/100) ))) ))
                then
                        # Determine what the problem could possibly be
                        case $dir in
                                SMTP_Cache)
                                        reason="The Analyzer process may be stuck or not running";;
                                Extractor/Cache)
                                        reason="The Parser process may not be running" ;;
                                SASI_Cache)
                                        reason="Permanent storage may not be available" ;;
                                *)
                                        reason="I'm not sure what's going on." ;;
                        esac
                        # Dump a message to the syslog
                        logger -t "$0" "($dir, $account) $reason."
                fi
        done
done