bf4

Table of contents

• Concepts
• Reads
  • Basic Setup
  • Filtering
  • Custom Filtering
  • Sorting
  • Custom Sorting

bf4

#!/usr/bin/env ruby

# List all keys stored in memcache. 
# Credit to Graham King at http://www.darkcoding.net/software/memcached-list-all-keys/ for the original article on how to get the data from memcache in the first place.

require 'net/telnet'
require 'csv'

headings = %w(id expires bytes key)
rows = []

bf4

class DatabaseController < ApplicationController
  def database_dump
    database = Rails.configuration.database_configuration[Rails.env]["database"]
    send_file_headers!(:type => 'application/octet-stream', :filename => "#{database}_#{Time.now.to_s(:human)}.backup")

    pipe = IO.popen("pg_dump '#{database}' -F c")
    stream = response.stream
    while (line = pipe.read(1024)) # per https://gist.github.com/njakobsen/6257887#gistcomment-1238467
      stream.write line
      Thread.pass # per https://gist.github.com/njakobsen/6257887#gistcomment-1235792

bf4

require './lib/adsjdbc-10.10.0.28.jar'
java_import java.sql.Driver
java_import java.sql.DriverManager
java_import 'com.extendedsystems.jdbc.advantage.ADSDriver'

class AdsAdapter

  def initialize(connect_string)
    @connect_string = connect_string
  end

bf4

ways to manually update RubyGems without susceptibility to CVE-2015-3900 (until there is a new ruby release)

because gem update --system uses rubygems to get the newest rubygems-update gem, and the vulnernability is in rubygems...

via ruby:

\curl -sSL https://gist.github.com/bf4/4223e83e8becacfb2a8e/download | \
  tar xzvf - --include 'update.rb' -O | ruby

bf4

A collection of Linux commands and concepts I tend to forget

bf4

Step 0. Install Docker

Step 1. For your chosen project, decide where you want to store your notebooks and files in a workingfolder.

Step 2. Open that folder in the terminal cd workingfolder

Step 3. Run this command

docker run -it --rm -v $PWD:/home/jovyan/work -p 8888:8888 jupyter/all-spark-notebook

bf4

What

A technique for writing parsers.

Why

• Easy to understand
• Generally applicable
• Full power of the programming language at your disposal
• Declarative

bf4

import time
import webbrowser

total_breaks = 8
break_count = 0

while (break_count < total_breaks):
	time.sleep(3600)
	webbrowser.open("https://31.media.tumblr.com/288d6e631cd930de65547ef5044fefb8/tumblr_mlksb86paT1qbuvyto1_500.gif")
	break_count = break_count + 1

bf4

module AMS
  module V09
    class Serializer < ActiveModel::Serializer

       def serializable_hash(adapter_options = nil,
                             options = {},
                             adapter_instance = self.class.serialization_adapter_instance)
         object.nil? ? nil : super
       end
    end