1 files changed, 98 insertions, 0 deletions
diff --git a/generate_rrd_db.sh b/generate_rrd_db.sh
new file mode 100755
index 0000000..e81b64d
--- /dev/null
+++ b/generate_rrd_db.sh
@@ -0,0 +1,98 @@
+#!/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