Graphite support for Dashing

README.md

##Yet another gist to provide Graphite support for Dashing Pull data from Graphite and present in Dashing. Support both graph and number widget.

Quick install:

dashing install 5088efcc94de2fecad5e

Set the graphite host/port and names of metrics in jobs/graphite.rb

# Set the graphite host and port (ip or hostname)
GRAPHITE_HOST = '127.0.0.1'
GRAPHITE_PORT = '8080'

# Job mappings. Define a name and set the metrics name from graphite
job_mapping = {
    'host1-load-1min' => '*.*.host1.load.onemin',
    'host2-load-1min' => '*.*.host1.load.onemin'
}

Configure your dashboard to use your data. Example dashboards/sample.erb:

    <li data-row="1" data-col="1" data-sizex="1" data-sizey="1">
        <div data-id="host1-load-1min" data-view="Graph" data-title="Host1 Load 1min" data-moreinfo="Last 4h"></div>
    </ul>
    <li data-row="1" data-col="1" data-sizex="1" data-sizey="1">
        <div data-id="host2-load-1min" data-view="Meter" data-title="Host2 Load 1min" data-min="0" data-max="100" data-moreinfo="Last 4h"></div>
    </ul>

As always, fork and tweak to suit your needs

graphite.rb

require 'net/http'
require 'json'
require 'date'

# Pull data from Graphite and make available to Dashing Widgets
# Heavily inspired from Thomas Van Machelen's "Bling dashboard article"

# Set the graphite host and port (ip or hostname)
GRAPHITE_HOST = '127.0.0.1'
GRAPHITE_PORT = '8080'
INTERVAL = '30s'

# Job mappings. Define a name and set the metrics name from graphite

job_mapping = {
    'host1-load-1min' => '*.*.host1.load.onemin',
    'host2-load-1min' => '*.*.host1.load.onemin'
}

# Extend the float to allow better rounding. Too many digits makes a messy dashboard
class Float
    def sigfig_to_s(digits)
        f = sprintf("%.#{digits - 1}e", self).to_f
        i = f.to_i
        (i == f ? i : f)
    end
end

class Graphite
    # Initialize the class
    def initialize(host, port)
        @host = host
        @port = port
    end

    # Use Graphite api to query for the stats, parse the returned JSON and return the result
    def query(statname, since=nil)
        since ||= '1h-ago'
        http = Net::HTTP.new(@host, @port)
        response = http.request(Net::HTTP::Get.new("/render?format=json&target=#{statname}&from=#{since}"))
        result = JSON.parse(response.body, :symbolize_names => true)
        return result.first
    end

    # Gather the datapoints and turn into Dashing graph widget format
    def points(name, since=nil)
        since ||= '-1min'
        stats = query name, since
        datapoints = stats[:datapoints]

        points = []
        count = 1

        (datapoints.select { |el| not el[0].nil? }).each do|item|
            points << { x: count, y: get_value(item)}
            count += 1
        end

        value = (datapoints.select { |el| not el[0].nil? }).last[0].sigfig_to_s(2)

        return points, value
    end

    def get_value(datapoint)
        value = datapoint[0] || 0
        return value.round(2)
    end

    def value(name, since=nil)
        since ||= '-10min'
        stats = query name, since
        last = (stats[:datapoints].select { |el| not el[0].nil? }).last[0].sigfig_to_s(2)

        return last
    end
end

job_mapping.each do |title, statname|
   SCHEDULER.every INTERVAL, :first_in => 0 do
        # Create an instance of our Graphite class
        q = Graphite.new GRAPHITE_HOST, GRAPHITE_PORT

        # Get the current points and value. Timespan is static atm
        points, current = q.points "#{statname}", "-1hour"

        # Send to dashboard, tested supports for number, meter and graph widgets
        send_event "#{title}", { current: current, value: current, points: points }
   end
end

No need to merge. If your works I'm ok to sunset this and leave you to maintain the graphite widget. I'm running my OpenTSDB widget and made the graphite one just for recreational purposes.

Paste a picture please.