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#!/bin/bash
# if this chart is called X.chart.sh, then all functions and global variables
# must start with X_
# _update_every is a special variable - it holds the number of seconds
# between the calls of the _update() function
example_update_every=
example_priority=150000
# _check is called once, to find out if this chart should be enabled or not
example_check() {
# this should return:
# - 0 to enable the chart
# - 1 to disable the chart
return 0
}
# _create is called once, to create the charts
example_create() {
# create the chart with 3 dimensions
cat <<EOF
CHART example.random '' "Random Numbers Stacked Chart" "% of random numbers" random random stacked $((example_priority)) $example_update_every
DIMENSION random1 '' percentage-of-absolute-row 1 1
DIMENSION random2 '' percentage-of-absolute-row 1 1
DIMENSION random3 '' percentage-of-absolute-row 1 1
CHART example.random2 '' "A random number" "random number" random random area $((example_priority + 1)) $example_update_every
DIMENSION random '' absolute 1 1
EOF
return 0
}
# _update is called continiously, to collect the values
example_last=0
example_count=0
example_update() {
local value1 value2 value3 value4 mode
# the first argument to this function is the microseconds since last update
# pass this parameter to the BEGIN statement (see bellow).
# do all the work to collect / calculate the values
# for each dimension
# remember: KEEP IT SIMPLE AND SHORT
value1=$RANDOM
value2=$RANDOM
value3=$RANDOM
value4=$((8192 + (RANDOM * 16383 / 32767) ))
if [ $example_count -gt 0 ]
then
example_count=$((example_count - 1))
[ $example_last -gt 16383 ] && value4=$((example_last + (RANDOM * ( (32767 - example_last) / 2) / 32767)))
[ $example_last -le 16383 ] && value4=$((example_last - (RANDOM * (example_last / 2) / 32767)))
else
example_count=$((1 + (RANDOM * 5 / 32767) ))
[ $example_last -gt 16383 -a $value4 -gt 16383 ] && value4=$((value4 - 16383))
[ $example_last -le 16383 -a $value4 -lt 16383 ] && value4=$((value4 + 16383))
fi
example_last=$value4
# write the result of the work.
cat <<VALUESEOF
BEGIN example.random $1
SET random1 = $value1
SET random2 = $value2
SET random3 = $value3
END
BEGIN example.random2 $1
SET random = $value4
END
VALUESEOF
# echo >&2 "example_count = $example_count value = $value4"
return 0
}
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