add all the files

Dockerfile

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+FROM alpine:latest
+MAINTAINER Jack Halford [jack.0x5.be]
+
+# nut is in testing
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
+
+# busybox-extras for inetd
+RUN apk update && apk add busybox-extras nut bash gawk
+
+COPY http_wrapper.sh /
+COPY upsc_exporter.sh /
+COPY upsc_to_prometheus.awk /
+COPY inetd.conf /etc/
+
+ENTRYPOINT ["inetd", "-f"]

http_wrapper.sh

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+#!/bin/bash
+# small http wrapper for bash scripts via inetd
+
+file="$1"
+mime='text/plain'
+
+if [ ! -f "$file" ]; then
+	echo "$1: No such file or directory" >&2
+	exit 1
+fi
+
+. $file > /tmp/.$$.output
+
+size=$(stat -c "%s" "/tmp/.$$.output")
+
+printf 'HTTP/1.1 200 OK\r\nDate: %s\r\nContent-Length: %s\r\nContent-Type: %s\r\nConnection: close\r\n\r\n' "$(date)" "$size" "$mime"
+
+cat /tmp/.$$.output
+
+rm -f /tmp/.$$.output

inetd.conf

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+# http_wrapper twice because its argv[0] argv[1] ...
+9614 stream tcp nowait root /http_wrapper.sh http_wrapper.sh /upsc_exporter.sh

upsc_exporter.sh

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+#!/bin/bash
+
+# default to ups@localhost
+UPS_TARGET="${UPS_TARGET:-ups@localhost}"
+
+upsc "$UPS_TARGET" | ./upsc_to_prometheus.awk

upsc_to_prometheus.awk

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+#!/usr/bin/awk -f
+# Rationale:
+# 	The output of upsc contains numerical metrics and strings. The
+#	numerical ones are made into prometheus series, while the strings
+#	are made into labels that are attaches to series by prefix.
+
+# $1 == metric name
+# $2 == metric value
+BEGIN { FS=": "; RS="\n" }
+# replace dots with underscores
+{gsub(/\./,"_",$1)}
+
+# split outlet_N into outletN to make multiple timeseries
+$1 ~ /^outlet_[0-9]+/ {gsub("outlet_","outlet",$1)}
+
+# convert status into number
+$1 ~ /ups_status/ {
+	if ($2 ~ /OL/) {$2 = "0"};
+	if ($2 ~ /OB/) {$2 = "1"};
+}
+
+# numerical values are metrics
+{ if ($2 ~ /^[0-9]*\.?[0-9]+$/) {
+	metrics[$1] = $2
+}
+# non numerical values are metric labels
+else {
+	prefix = getprefix($1)
+	gsub(prefix"_","",$1);
+	label=$1;
+	value=$2;
+	if (labels[prefix] != "")
+		labels[prefix]=labels[prefix]", "
+	else
+		labels[prefix]="{"
+	labels[prefix]=labels[prefix]label"=\""value"\"";
+}}
+
+# print all ,etrics with corresponding labels
+END {
+	for (metric in labels) { labels[metric]=labels[metric]"}" }
+	for (metric in metrics) {
+		prefix = getprefix(metric)
+		print "upsc_" metric labels[prefix], metrics[metric]
+	}
+}
+
+function getprefix(str) {
+	n=split(str,array,"_");
+	return array[1]
+	# if (array[1] == "ups")
+	# 	prefix=array[1]"_"array[2]
+	# else
+	# 	prefix=array[1]
+	# return prefix
+}