Artem Golub corpulent

Waiting for a Value to Change in Go

When multiple goroutines share access to a value that will periodically change, readers may wish to wait for a value to be updated before reading the value again. This can be solved using a condition variable:

var val *Thing
var mu = new(sync.Mutex)
var cond = sync.NewCond(mu)

func wait(old *Thing) *Thing {

Complete authentication as API including OAuth2 endpoints

I implemented an auth API for a SPA. This is rarely documented and therefore I want to share here how I did it hoping it will be a help for others.

We are still working on it and I'll update this document accordingly.

This tutorial uses following versions:

Package	Version

Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

-#!/bin/sh
-# based on https://gist.github.com/ipedrazas/9c622404fb41f2343a0db85b3821275d
-# delete all evicted pods from all namespaces
-kubectl get pods --all-namespaces | grep Evicted | awk '{print $2 " --namespace=" $1}' | xargs kubectl delete pod
-# delete all containers in ImagePullBackOff state from all namespaces
-kubectl get pods --all-namespaces | grep 'ImagePullBackOff' | awk '{print $2 " --namespace=" $1}' | xargs kubectl delete pod
-# delete all containers in ImagePullBackOff or ErrImagePull or Evicted state from all namespaces

	#wrokflow doc

	{
	"_id": "63761a9646ecc443c460069a5006b44b",
	"_rev": "11-11813e6bff59bf0056bbc545dc2df3e0",
	"type": "workflow",
	"background": true,
	"paginated": false,
	"zip": true,
	"steps": [

	from lxml import html
	import requests
	import unicodecsv as csv
	import argparse
	import json


	def clean(text):
	if text:
	return ' '.join(' '.join(text).split())

	---
	AWSTemplateFormatVersion: 2010-09-09

	Description: >
	A basic CloudFormation template for an RDS Aurora cluster.

	Parameters:
	DatabaseUsername:
	AllowedPattern: "[a-zA-Z0-9]+"
	ConstraintDescription: must be between 1 to 16 alphanumeric characters.

	FROM alpine:3.3
	MAINTAINER Tom Maiaroto <[email protected]>

	# Install packages
	RUN apk --update --repository http://dl-3.alpinelinux.org/alpine/edge/main add \
	freetype-dev \
	libjpeg-turbo-dev \
	libpng-dev \
	libwebp-dev \
	php7 \

	{
	"text": " alertDetails - ID: monitorID. URL: [monitorURL](monitorURL)",
	"title": "monitorFriendlyName is alertTypeFriendlyName"
	}