#!/bin/sh

# © 2012 - Stig Sandbeck Mathisen <ssm@fnord.no>
#
# varnish_devicedetect - Plugin to graph the device usage ratio of website
# visitors
#
# This plugin reads data from the Varnish shared memory log, and presents a
# stacked percentage graph of the device types of your website visitors for all
# entries present in the log.
#
# Requires:
#
#  * Varnish
#
#  * varnish-devicedect from https://github.com/varnish/varnish-devicedetect
#

print_config() {
    printf "graph_title Varnish device detection\n"
    printf "graph_vlabel percent\n"
    printf "graph_category varnish\n"
    printf "graph_args --lower-limit 0 --upper-limit 100\n"

    for device in bot mobile-android mobile-iphone pc tablet-android tablet-ipad; do
        printf "%s.label %s\n" $device $device
        printf "%s.type GAUGE\n" $device
        printf "%s.draw AREASTACK\n" $device
    done
}

print_values() {
    varnishlog -d -m 'TxHeader:X-UA-Device:' -I X-UA-Device \
        | awk '
  $4 == "X-UA-Device:" {
    total++;
    devices[$5]++
  }

  END {
    for (device in devices)
      printf "%s.value %f\n", device, devices[device] / total * 100.0
  }
'
}

case $1 in
    autoconf)
        printf "no\n"
        exit 1
        ;;
    config)
        print_config
        ;;
    *)
        print_values
        ;;
esac