From 5694d60621969f2d531f5cdda3a19f1e3f958c07 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Sun, 30 Aug 2020 15:27:15 +0200
Subject: monitoring: Also plot

---
 monitoring/monitoring.sh | 56 +++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 53 insertions(+), 3 deletions(-)

diff --git a/monitoring/monitoring.sh b/monitoring/monitoring.sh
index b09489d..328c3f6 100755
--- a/monitoring/monitoring.sh
+++ b/monitoring/monitoring.sh
@@ -2,6 +2,49 @@
 set -euo pipefail
 
 SLEEPTIME=60
+PLOTDIR=""
+
+function usage() {
+	echo >&2 "Usage: $0 [-s sleeptime] [-o plotdir]"
+	echo >&2 "  -s sleeptime   Time to sleep between polls; default $SLEEPTIME seconds"
+	echo >&2 "  -o plotdir     Output directory for plots; default none"
+}
+
+ARGS=$(getopt -o 'hs:o:' -n "$0" -- "$@")
+eval set -- "$ARGS"
+unset ARGS
+
+while true; do
+	case "$1" in
+		-h)
+			usage
+			exit 0
+			;;
+
+		-s)
+			SLEEPTIME="$2"
+			shift 2
+			;;
+
+		-o)
+			PLOTDIR="$2"
+			shift 2
+			;;
+
+		--)
+			shift
+			break
+			;;
+	esac
+done
+
+if [[ $# -gt 0 ]]; then
+	usage
+	exit 1
+fi
+
+[[ -n $PLOTDIR ]] && PLOTDIR=$(realpath "$PLOTDIR")
+[[ ! -d $PLOTDIR ]] && { echo >&2 "'$PLOTDIR' is not a directory"; exit 1; }
 
 cd "$(dirname "$0")"
 
@@ -12,12 +55,19 @@ stat --version 2>/dev/null | grep -q 'GNU coreutils' || {
 logf_dbsize="log_dbsize.txt"
 [[ -f $logf_dbsize ]] && echo "Appending to '$logf_dbsize'" || echo "Logging to '$logf_dbsize'"
 
-echo "Monitoring: logging every $SLEEPTIME seconds"
-
 while true; do
 	now="$EPOCHSECONDS"
-	dbsize="$(stat -c '%s' ../db.db)"
+	dbsize=$(stat -c '%s' ../db.db)
 	echo "$now $dbsize" >>"$logf_dbsize"
 
+	if [[ -n $PLOTDIR ]]; then
+		gnuplot <<EOF
+set terminal png size 960,640
+set output '$PLOTDIR/dbsize.png'
+set grid
+plot '$logf_dbsize' w lp
+EOF
+	fi
+
 	sleep "$SLEEPTIME"
 done
-- 
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