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README.md

Build Status

Big Brother

A Clojure library designed to monitor things and retrieve some metrics. It could send the metrics to Riemann.

Install

Add this dependency to your project.clj:

Clojars Project

Usage

Full example:

(ns myproject.core
    (:require [bigbrother.core :as bb]))

...
(def riemann-host "localhost")
(def riemann-service "bb")
(def nb-ms-metrics 1000) ; send metrics info every second
(bb/init-metrics
    {:read-book     (bb/warn-level 10 100) ; <- less than 10ms is ok
     :write-notes   (bb/warn-level 10 100) ; <- warn between 10ms and 100ms
     :feel-free     (bb/warn-level 10 100) ; <- critical if more than 100ms
     :free-time     (bb/warn-level 10 100) ; <- normal if less than 10ms
     :work-as-usual (bb/rev-warn-level 100 10) ; <- normal if more than 100 critical <10
     :total         (bb/warn-level 100 500) ; <- 0..100 normal, 0..500 warn, >500 critical
     :nb            (bb/rev-warn-level 5 1) ; <- less than 1 critical, less than 5 warn
     }
    nb-ms-metrics
    riemann-host
    riemann-service
    {:host "My-Custom-Name"})

;; If you log metrics not declared in init-metrics, they will show as always "ok"

...

(defn function-called-frequently
    []
    (let [session (bb/big-brother-is-watching-you)] ; <-- you must start the timer
      (when (has-book?)
          (read-book) ; <-- do your action
          (bb/log-time session :read-book) ; <-- tell the timer you've done something
          (bb/log-counter :book) ; <-- increment the counter :book
          )
      (write-notes)
      (bb/log-time session :write-notes)
      (let [time-felt-free (feel-free)]
          (bb/log-time session :feel-free)
          (bb/log-mmetric :freetime time-felt-free))
      (work-as-usual)
      (bb/log-time session :work-as-usual)
      (bb/telescreen-off session) ; <-- end the timer loop to flush times.
      (bb/end-session! session)) ; <-- end this session

Init

The init-metrics function takes:

  • a map containing metrics name for keys and warning level functions as values
  • the nb of ms to wait before sending new metrics
  • a riemann host (if nil won’t use riemann)
  • a riemann service name.

That will send data to riemann every nb-ms-metrics ms.

(bb/init-metrics
    {:read-book     (bb/warn-level 10 100) ; <- less than 10ms is ok
     :write-notes   (bb/warn-level 10 100) ; <- warn between 10ms and 100ms
     :feel-free     (bb/warn-level 10 100) ; <- critical if more than 100ms
     :free-time     (bb/warn-level 10 100) ; <- normal if less than 10ms
     :work-as-usual (bb/rev-warn-level 100 10) ; <- normal if more than 100 critical <10
     :total         (bb/warn-level 100 500) ; <- 0..100 normal, 0..500 warn, >500 critical
     :nb            (bb/rev-warn-level 5 1) ; <- less than 1 critical, less than 5 warn
     }
    nb-ms-metrics
    riemann-host
    riemann-service)

Timers

(do
    (action)
    (bb/log-time session :action))

Will tell big brother that the action :action finished. Generally you use timers like this:

(do
    (let [session (bb/big-brother-is-watching-you)]
      (action1)
      (bb/log-time session :action1)
      (action1)
      (bb/log-time session :action1)
      (bb/telescreen-off session)
      (bb/end-session! session))

You declare a start time which will start the chrono. Then each time you declare a log-time it will add the time taken to the action name.

Once you finished your course of action you declare the timer-loop as finished. And you stop the chrono up until the next (bb/big-brother-is-watching-you).

In the end, the value will be the mean of the time taken by each action during the big loop.

Counters

Counter can be called:

(do
  (bb/log-counter :foo)
  (bb/log-counter :bar 3))

Will increment :foo by 1 and :bar by 3. In the end, the result will be the mean of the counter number by second.

Metrics

Metrics are quite similar to counters. The main difference is that there is no notion of increment. You must always provide a value for a metrics. The resume will contains its mean normalized by second.

(do
    (bb/log-metric :foo 0.5)
    (bb/log-metric :foo 2.5)
    (bb/log-metric :foo 3))

In the resume you’ll get {:foo 2.0} ((0.5 + 2.5 + 3)/3).

Max Metrics

Sometime you might want to get the maximum of some values during an interval of time.

(do
  (bb/log-mmetric :foo 5)
  (bb/log-mmetric :foo 1)
  (bb/log-mmetric :foo 3))

That will display {:foo 5} in the resume.

Open Issue

Sending a really huge number of timer events could lead to a stack overflow. Just add more size to your stack -Xss16m.

License

Copyright © 2015 Yann Esposito

Distributed under the MIT License