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#!/bin/bash
RRD_DATABASE=""
RRD_GRAPH=w1_graph.png
# Base interval in seconds with which data will be fed into the database:
STEP=15
# One wire sensor address:
ROM=00-055300000000 # TODO: update me with a real thing!
# Seconds in a year: 31'536'000
GRAPH=false
CREATE=false
function Help() {
# Display help
echo "Command generating graph from rrd database"
echo
echo "Syntax: generate_rrd [-h|-g|-c|-o|-i]"
echo "options:"
echo "-h Print this help"
echo "-g Create graph"
echo "-c Create database"
echo "-i Input rrd database file"
echo "-o Output image, defaults to 'w1_graph.png'"
exit 0
}
# Create rrd database if not exist,
# TODO: generate more graphs based on averages
# Keep once in 5 minutes average, min and max for a month,
# Keep once an hour for a year:
function rrd_create() {
if test -f "$RRD_DATABASE"; then
echo "Database already exists, exiting."
exit 1
else
rrdcreate "$RRD_DATABASE" --step="$STEP" \
DS:temp:GAUGE:45:U:U \
RRA:AVERAGE:0.5:1:108000 \
RRA:AVERAGE:0.5:20:5400 \
RRA:MIN:0.5:20:5400 \
RRA:MAX:0.5:20:5400 \
RRA:AVERAGE:0.5:240:131400 \
RRA:MAX:0.5:240:131400 \
RRA:AVERAGE:0.5:240:131400
fi
}
# Generate graph image:
rrd_graph() {
echo "Creating graph $RRD_GRAPH"
rrdtool graph "$RRD_GRAPH" --start -86400 --end now \
--vertical-label "Temperature C" \
--upper-limit 40 \
--lower-limit -30 \
-w 640 -h 480 \
DEF:temperature="$RRD_DATABASE":temp:AVERAGE \
LINE1:temperature#00FF00:"temperature C"
}
while getopts hgci:o: flag; do
case "${flag}" in
h) Help # Display help
exit;;
i) # Input rrd file
RRD_DATABASE=${OPTARG};;
o) # Output image
RRD_GRAPH=${OPTARG};;
c) # Create rrd database
echo "Creating database ..."
CREATE=true;;
g) # Create graph
echo "Creating graph ..."
GRAPH=true;;
\?) # Invalid option
echo "Invalid option"
Help;;
esac
done
if [ -z "$RRD_DATABASE" ]
then
echo "Please specify rrd database."
Help
fi
if [[ $CREATE == false ]] && [[ $GRAPH == false ]];then
echo "Specify either database creation (-c) or graph generation (-g) option"
Help
fi
if $CREATE; then
rrd_create
fi
if $GRAPH; then
rrd_graph
fi
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