Thiago Lima tavlima

Intro

To use aws cli, its common to invoke built-in features like --filters and --query however they aren't avaiable for all the commands.

for my use case i wanted to get a role matching a name, i.e. regex pattern . that was very easy using jq

one-liner to get Role ARN of a role macthing name

if i want to get a role matching name eksctl-dev-cluster-addon-iamserviceaccount then to get ARN of that role is simply doing

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

"Build tools for others that you want to be built for you." - Kenneth Reitz
"Simplicity is alway better than functionality." - Pieter Hintjens

The reason why you might get certificate errors in Ruby 2.0 when talking HTTPS is because there isn't a default certificate bundle that OpenSSL (which was used when building Ruby) trusts.

Update: this problem is solved in edge versions of rbenv and RVM.

$ ruby -rnet/https -e "Net::HTTP.get URI('https://github.com')"
net/http.rb:917:in `connect': SSL_connect returned=1 errno=0 state=SSLv3
  read server certificate B: certificate verify failed (OpenSSL::SSL::SSLError)

You can work around the issue by installing a certificate bundle that you trust. I trust Mozilla and curl.

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	See question on stack overflow: http://stackoverflow.com/questions/28595636/rails-4-how-to-give-alias-names-to-includes-and-joins-in-active-record-que

	- Model Student and model Teacher are both STI models with super class model User
	- Model Story is a STI model with super class model Task
	- includes() and joins(), both fails

	Rails alias naming convention (includes() and joins())

	- One model as parameter
	- is base model (includes(:users))

	class MyManagedResource extends ResourceController[String] {
	def index = Action(Ok("index"))

	def newScreen = Action(Ok("new"))

	def create = Action {
	Redirect(MyInjectableResource.reverseRoutes.index())
	}

	def show(id: String) = Action(Ok("Show " + id))

	package app;

	import com.avaje.ebean.Ebean;
	import com.avaje.ebean.EbeanServer;
	import com.avaje.ebean.config.ServerConfig;
	import com.avaje.ebean.config.dbplatform.MySqlPlatform;
	import com.avaje.ebeaninternal.api.SpiEbeanServer;
	import com.avaje.ebeaninternal.server.ddl.DdlGenerator;
	import org.junit.AfterClass;
	import org.junit.Before;

	package com.example;

	import org.apache.wicket.util.time.Duration;
	import org.eclipse.jetty.http.ssl.SslContextFactory;
	import org.eclipse.jetty.server.Server;
	import org.eclipse.jetty.server.bio.SocketConnector;
	import org.eclipse.jetty.server.ssl.SslSocketConnector;
	import org.eclipse.jetty.util.resource.Resource;
	import org.eclipse.jetty.webapp.WebAppContext;
	import org.eclipse.jetty.plus.webapp.EnvConfiguration;