#!/bin/sh

# Copyright 2015-2019 Rivoreo

# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:

# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

PROGRAM_DIR="`dirname \"$0\"`"
. "$PROGRAM_DIR/utils.sh"
load_config_file "$PROGRAM_DIR/performance-monitor.cfg"
load_config_file /etc/performance-monitor.cfg
handle_command_line_options "$@"
if [ -z "$INFLUXDB_BASE_URL" ] || [ -z "$INFLUXDB_DB_NAME" ]; then
	echo "INFLUXDB_BASE_URL and INFLUXDB_DB_NAME must be set" 1>&2
	exit 1
fi
if ! printf %s "$INFLUXDB_BASE_URL" | grep -q -e "^http://" -e "^https://"; then
	echo "INFLUXDB_BASE_URL doesn't contain a supported protocol" 1>&2
	exit 1
fi
[ -n "${INFLUXDB_BASE_URL##*/}" ] && INFLUXDB_BASE_URL="$INFLUXDB_BASE_URL/"
[ -z "$HTTP_CLIENT" ] && check_http_client
[ -z "$INTERVAL" ] && INTERVAL=5
[ -n "$INTERFACE" ] && set_hostname_from_interface "$INTERFACE"
[ -z "$HOSTNAME" ] && HOSTNAME="`hostname`"

count=0
while true; do
	line_count=0
	while read line; do
		line_count=$((line_count+1))
		[ $line_count -lt 3 ] && continue
		set -- $line
		if [ $# != 17 ]; then
			echo "data error: # $# != 17" 1>&2
			continue
		fi
		ifname="${1%:}"
		[ "$ifname" = lo ] && continue
		e_ifname="`printf %s \"$ifname\" | sed -r 's/[.-]/_/g'`"
		eval "last_rx=\$last_rx_$e_ifname"
		eval "last_tx=\$last_tx_$e_ifname"
		if [ -n "$last_rx" ] && [ -n "$last_tx" ] && [ $count = $INTERVAL ]; then
			rx_diff=$((${2}-last_rx))
			tx_diff=$((${10}-last_tx))
			[ "$rx_diff" -lt 0 ] && rx_diff=0
			[ "$tx_diff" -lt 0 ] && tx_diff=0
			http_post "${INFLUXDB_BASE_URL}write?db=$INFLUXDB_DB_NAME" \
				"traffic,host=$HOSTNAME,interface=$ifname receive_rate=$rx_diff,transmit_rate=$tx_diff"
		fi
		eval "last_rx_$e_ifname=${2}"
		eval "last_tx_$e_ifname=${10}"
	done < /proc/net/dev
	if [ $count = $INTERVAL ]; then
		count=0
	else
		count=$((count+1))
	fi
	sleep 1
done
