prometheus-config.sh

#!/usr/bin/env bash
usage="$(basename "$0") [-h] [-m alert_manager address]  [-L] [-T additional-prometheus-targets] [--compose] -- Generate grafna's datasource file"
CONSUL_ADDRESS=""
COMPOSE=0
BASE_DIR="$PWD/prometheus/build"
if [ -f env.sh ]; then
	. env.sh
fi

if [ "$1" = "" ]; then
	echo "$usage"
	exit
fi
for arg; do
	shift
	if [ -z "$PARAM" ]; then
		case $arg in
		--compose)
			COMPOSE=1
			AM_ADDRESS="aalert:9093"
			;;
		--no-cas-cdc)
			NO_CAS="1"
			NO_CDC="1"
			;;
		--no-cas)
			NO_CAS="1"
			;;
		--no-cdc)
			NO_CDC="1"
			;;
		--scrap)
			PARAM="scrap"
			;;
		--no-node-exporter-file)
			NO_NODE_EXPORTER_FILE="1"
			;;
		--no-manager-agent-file)
			NO_MANAGER_AGENT_FILE="1"
			;;
		*)
			set -- "$@" "$arg"
			;;
		esac
	else
		DOCR=$(echo $arg | cut -d',' -f1)
		VALUE=$(echo $arg | cut -d',' -f2- | sed 's/#/ /g')
		NOSPACE=$(echo $arg | sed 's/ /#/g')
		if [[ $NOSPACE == --* ]]; then
			echo "Error: No value given to --$PARAM"
			echo
			usage
			exit 1
		fi
		if [ "$PARAM" = "scrap" ]; then
			SCRAP_INTERVAL="$NOSPACE"
		fi
		unset PARAM
	fi
done

while getopts ':hL:m:T:E:s:' option; do
	case "$option" in
	h)
		echo "$usage"
		exit
		;;
	L)
		CONSUL_ADDRESS="$OPTARG"
		;;
	T)
		PROMETHEUS_TARGETS+=("$OPTARG")
		;;
	m)
		AM_ADDRESS="$OPTARG"
		;;
	s)
		BASE_DIR="$PWD/prometheus/build/stack/$OPTARG"
		;;
	E)
		EVALUATION_INTERVAL="$OPTARG"
		;;
	:)
		printf "missing argument for -%s\n" "$OPTARG" >&2
		echo "$usage" >&2
		exit 1
		;;
	\?)
		printf "illegal option: -%s\n" "$OPTARG" >&2
		echo "$usage" >&2
		exit 1
		;;
	esac
done

mkdir -p $BASE_DIR/
if [ -z $CONSUL_ADDRESS ]; then
	sed "s/AM_ADDRESS/$AM_ADDRESS/" $PWD/prometheus/prometheus.yml.template >$BASE_DIR/prometheus.yml
else
	if [[ ! $CONSUL_ADDRESS = *":"* ]]; then
		CONSUL_ADDRESS="$CONSUL_ADDRESS:5090"
	fi
	sed "s/AM_ADDRESS/$AM_ADDRESS/" $PWD/prometheus/prometheus.consul.yml.template | sed "s/MANAGER_ADDRESS/$CONSUL_ADDRESS/" >$BASE_DIR/prometheus.yml
fi

if [[ "$EVALUATION_INTERVAL" != "" ]]; then
	sed -i "s/  evaluation_interval: [[:digit:]]*.*/  evaluation_interval: ${EVALUATION_INTERVAL}/g" $BASE_DIR/prometheus.yml
fi
if [[ "$SCRAP_INTERVAL" != "" ]]; then
	sed -i "s/  scrape_interval: [[:digit:]]*.*# *Default.*/  scrape_interval: ${SCRAP_INTERVAL}s/g" $BASE_DIR/prometheus.yml
	TIMEOUT=$(($SCRAP_INTERVAL - 5))
	sed -i "s/  scrape_timeout: [[:digit:]]*.*# *Default.*/  scrape_timeout: ${TIMEOUT}s/g" $BASE_DIR/prometheus.yml
fi
if [ "$NO_CAS" = "1" ] && [ "$NO_CDC" = "1" ]; then
	sed -i "s/ *# FILTER_METRICS.*/    - source_labels: [__name__]\\n      regex: '(.*_cdc_.*|.*_cas.*)'\\n      action: drop/g" $BASE_DIR/prometheus.yml
elif [ "$NO_CAS" = "1" ]; then
	sed -i "s/ *# FILTER_METRICS.*/    - source_labels: [__name__]\\n      regex: '(.*_cas.*)'\\n      action: drop/g" $BASE_DIR/prometheus.yml
elif [ "$NO_CDC" = "1" ]; then
	sed -i "s/ *# FILTER_METRICS.*/    - source_labels: [__name__]\\n      regex: '(.*_cdc_.*)'\\n      action: drop/g" $BASE_DIR/prometheus.yml
fi
if [ "$NO_NODE_EXPORTER_FILE" = "1" ]; then
	sed -i "s/ *# NODE_EXPORTER_PORT_MAPPING.*/    - source_labels: [__address__]\\n      regex:  '(.*):\\\\d+'\\n      target_label: __address__\\n      replacement: '\$\{1\}'\\n/g" $BASE_DIR/prometheus.yml
fi
if [ "$NO_MANAGER_AGENT_FILE" = "1" ]; then
	sed -i "s/ *# MANAGER_AGENT_PORT_MAPPING.*/    - source_labels: [__address__]\\n      regex:  '(.*):\\\\d+'\\n      target_label: __address__\\n      replacement: \'\$\{1\}\'\\n/g" $BASE_DIR/prometheus.yml
fi

for val in "${PROMETHEUS_TARGETS[@]}"; do
	if [[ ! -f $val ]]; then
		echo "Target file $val does not exists"
		exit 1
	fi
	cat $val >>$BASE_DIR/prometheus.yml
done