ff-mesh-metrics

A small program that parses graph.json from ffmap-backend and outputs some metrics.

How to build

• Install Stack
• Execute stack build

How to use

Here is an example for how to integrate the data from this program into graphite,
using the carbon plaintext protocol. Requires jshon and nc (netcat).

#!/bin/bash

binPath="/somewhere/ff-mesh-metrics/.stack-work/install/x86_64-linux/lts-5.1/7.10.3/bin"
jsonPath="/somewhere/ffmap-backend/data"
wspPath="ffxy.globalstats"
carbonHost="localhost"
carbonPort="2003"

jsonData=$("$binPath/ff-mesh-metrics" < "$jsonPath/graph.json")
carbonInput=""

for attr in $(jshon -k <<< "$jsonData"); do
	value=$(jshon -e $attr <<< "$jsonData")
	timestamp=$(date +%s)
	# If you have the data from 1 minute ago because this runs as an independent
	# cron job instead of waiting for the current data to be available
	#timestamp=$(($(date +%s) - 60))
	carbonInput+="$wspPath.$attr $value $timestamp"$'\n'
done

nc -q0 $carbonHost $carbonPort <<< "$carbonInput"

How is this 'Mesh rate' calculated?

• If there are less than 2 nodes, it's undefined (null in the json output)
• Otherwise, it is (nodes - subnets) / (nodes - 1)

Where subnets is the amount of physically independent nodes or meshes. If that description doesn't make much sense to you, here is a graphic of 7 nodes forming 3 subnets. The mesh rate here would be 66.66%.