eric

module Zookeeper
  class BroadcastTrigger
    def initialize(zk, path)
      @zk   = zk
      @path = path
    end

    def trigger
      @zk.set(@path, "#{$$}")
    rescue ZK::Exceptions::NoNode

eric

Installing hitimes (1.1.1) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb 
creating Makefile

make
xcrun cc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -DUSE_INSTANT_OSX=1 -Wall  -c hitimes_ext.c
xcrun cc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -DUSE_INSTANT_OSX=1 -Wall  -c hiti

eric

  class Scheduler < Rufus::Scheduler::PlainScheduler
    def initialize(zk, *args)
      super(*args)

      @zk_locker = zk.exclusive_locker('scheduler')
    end

    def run
      @zk_locker.with_lock do
        configure

eric

Update

You can now find this packaged up nicely in a rubygem as rollout-zk.

---

Zookeeper storage adapter for rollout

I've implemented a zookeeper-based storage adapter for [rollout][] that does not require any network roundtrips to check if a feature is active for a user.

eric

# from https://github.com/slyphon/zk/issues/68

require 'zk'

ZK_PATH = '/test/path/child'
CHILD_PATH = ZK_PATH + '/foo'
SLEEP_TIME = 1

class Writer
  def initialize(start_signal, finish_signal)

eric

reader: zookeeper: initiating connection to localhost:2181
reader: zookeeper: #zkc_set_running_and_notify!
reader: zookeeper: #event_thread_body starting event thread
reader: zookeeper: init returned!
reader: zookeeper: event_thread waiting until running: true
reader: zookeeper: event_thread running: true
zookeeper_server: Accepted socket connection from /fe80:0:0:0:0:0:0:1%1:54365
zookeeper_server: Accepted socket connection from /127.0.0.1:54366
zookeeper_server: Session establishment request from client /fe80:0:0:0:0:0:0:1%1:54365 client's lastZxid is 0x0
zookeeper_server: Connection request from old client /fe80:0:0:0:0:0:0:1%1:54365; will be dropped if server is in r-o mode

eric

// Originally from:
//  * http://blog.stephenboak.com/2011/08/07/easy-as-a-pie.html
//  * http://jsfiddle.net/stephenboak/hYuPb/
//
// Improved by Eric Lindvall to be more d3-ish

function donutChart() {
  var width = 450;
  var height = 300;
  var radius = 100;

eric

Get metrics from codahale/metrics in realtime.

Requires obfuscurity/tasseo#64

eric

Sentry and the JVM

Unfortunately Java's built-in cacerts do not include StartCom SSL root certificates.

Because of this, you must tell java to trust these certificates.

The easiest way I've found to do it is as follows:

1. Make a copy of the JRE cacerts

eric

(def levels {:trace org.apache.log4j.Level/TRACE
             :debug org.apache.log4j.Level/DEBUG
             :info  org.apache.log4j.Level/INFO
             :warn  org.apache.log4j.Level/WARN
             :error org.apache.log4j.Level/ERROR
             :fatal org.apache.log4j.Level/FATAL})

(defn set-level
  "Set the level for the given logger, by string name. Use:
  (set-level \"skuld.node\", :debug)"