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#!/bin/bash
# ---------------------------------------------------------------------------------------
# This example is for three modems, named GSM1, GSM2 and GSM3 using queues Q1, Q2 and Q3.
# In the global part of smsd.conf, enable message counters:
# stats = /var/spool/sms/stats
# Use zero value for interval if statistics files are not used:
# stats_interval = 0
#
# Enable checkhandler (this script):
# checkhandler = /usr/local/bin/load_balancing.sh
#
# Define queues and providers:
# [queues]
# Q1 = /var/spool/sms/Q1
# Q2 = /var/spool/sms/Q2
# Q3 = /var/spool/sms/Q3
#
# [providers]
# Q1 = 0,1,2,3,4,5,6,7,8,9,s
# Q2 = 0,1,2,3,4,5,6,7,8,9,s
# Q3 = 0,1,2,3,4,5,6,7,8,9,s
#
# Add queue definition for each modem:
# [GSM1]
# queues = Q1
# etc...
# ---------------------------------------------------------------------------------------
STATSDIR=/var/spool/sms/stats
read_counter()
{
RESULT=0
FILE=$STATSDIR/$1.counter
if [[ -e $FILE ]]
then
COUNTER=`formail -zx $1: < $FILE`
if [ "$COUNTER" != "" ]; then
RESULT=$COUNTER
fi
fi
return $RESULT
}
# If there is Queue (or Provider) defined, load balancing is ignored:
QUEUE=`formail -zx Queue: < $1`
if [ "$QUEUE" = "" ]; then
QUEUE=`formail -zx Provider: < $1`
if [ "$QUEUE" = "" ]; then
# Read current counters:
read_counter GSM1
COUNTER1=$?
read_counter GSM2
COUNTER2=$?
read_counter GSM3
COUNTER3=$?
QUEUE=Q1
COUNTER=$COUNTER1
if [ $COUNTER2 -lt $COUNTER ]; then
QUEUE=Q2
COUNTER=$COUNTER2
fi
if [ $COUNTER3 -lt $COUNTER ]; then
QUEUE=Q3
COUNTER=$COUNTER3
fi
TMPFILE=`mktemp /tmp/smsd_XXXXXX`
cp $1 $TMPFILE
formail -f -I "Queue: $QUEUE" < $TMPFILE > $1
unlink $TMPFILE
fi
fi
exit 0
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