omnifroodle

Working backwards with Astra and Python/Flask/Django

So you heard about this awesome new hosted Cassandra and wanted to kick the tires? But after setting up your favorite stack you realize that the secure connect bundle from Astra doesn’t seem to plug in anywhere. Suddenly easy doesn’t seem so easy anymore.

I’m going to walk you through one example of how you can connect an older CQL library to Astra. In this case we’ll be using Flask and CQLAlchemy. CQLAlchemy has something of a following in the Flask/Cassandra world but hasn’t seen an update in a while.

First, unzip the secure bundle you downloaded from Astra. You should see something like this:

$ ls secure-connect

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1. Get the Kubernetes manifests you’ll need for Kafka

git clone https://github.com/Yolean/kubernetes-kafka.git
cd kubernetes-kafka

2. Register a couple storage classes in the cluster (note, these probably already exist)

kubectl apply -f ./configure/docker-storageclass-broker.yml

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from cassandra.cluster import Cluster
from cassandra.policies import RoundRobinPolicy

from locust import Locust, events, task, TaskSet

import time

class CassandraClient(object):

    def __init__(self, host):

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Keybase proof

I hereby claim:

• I am omnifroodle on github.
• I am omnifroodle (https://keybase.io/omnifroodle) on keybase.
• I have a public key ASB6s7c05WNgmytiCcEfmGgyH3p2A3OG05X2U8PKdr4Dowo

To claim this, I am signing this object:

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# Fish git prompt
set __fish_git_prompt_showdirtystate 'yes'
set __fish_git_prompt_showstashstate 'yes'
set __fish_git_prompt_showupstream 'yes'
set __fish_git_prompt_color_branch yellow

# Status Chars
set __fish_git_prompt_char_dirtystate '✎ '
set __fish_git_prompt_char_stagedstate '☑ '
set __fish_git_prompt_char_stashstate '☄ '

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set shell=bash

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<?xml version="1.0" encoding="UTF-8" ?>

<!--
 This is the Solr schema file. This file should be named "schema.xml" and
 should be in the conf directory under the solr home
 (i.e. ./solr/conf/schema.xml by default)
 or located where the classloader for the Solr webapp can find it.

 For more information, on how to customize this file, please see
 http://wiki.apache.org/solr/SchemaXml

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for INSTANCE in `cat ~/instance_addr_list`
do 
  echo '------------'
  echo $INSTANCE
  echo '------------'
  for i in 1 2 
  do
    ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=false $INSTANCE "nohup sh ~/bin/image-node/do-task.sh &> /dev/null &"
  done
done

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#!/usr/bin/ruby
# This script installs to /usr/local only. To install elsewhere you can just
# untar https://github.com/mxcl/homebrew/tarball/master anywhere you like.

module Tty extend self
  def blue; bold 34; end
  def white; bold 39; end
  def red; underline 31; end
  def reset; escape 0; end
  def bold n; escape "1;#{n}" end

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class Die
  attr_reader :d, :face, :bonus, :modifier

  def initialize(d)
    parse_d(d)
    @face = roll
    if @d == @face
      @bonus = Die.new(d)
    end
  end