Danny Coates dannycoates

Creating a feature flag

Feature flags are the most basic tool in the Able toolbox but they can be very useful. They allow you to ship code that might not quite be ready for your massive user base but that you want to try out and get some feedback on, or be ready to switch off again if things go sideways.

Able works in browsers and node.js servers for the time being. In this post we'll focus on using the browser. The server side usage is slightly different.

Here's what we'll need to do:

create an experiment repository
add our repository to an Able project registry

abatar A/B testing framework

A workflow for testing and releasing application features.

Example

I've got a web app that I'd like to do some A/B testing on.

App

FxA-dev

ansible based combined dev environment
AWS CloudFormation
meant to be prod-like but simpler

Structure

base roles
role per project

FxA Auth Server

Purely an API server
Stores account credentials, secret keys, "sessions"
signs keys for assertions

Data Model

Accounts
SessionTokens

Q3 FxA Internal Goals

common standards for log, stats, and config formats
- all repos following these standards
- collaborate with larger Cloud Services team on these standards (especially logs)
- (stretch) common library implementations
noticeably easier deployment compared to train-16 for fxa services
- as determined by us
documented dev guidelines
a new contributor should be able to read this and not be surprised by any steps between fixing a bug and seeing it in production

FxA Log Format

version 0.0.1-draft-1

Goals

A standard base log format that enables log messages to be easily routed and filtered while allowing applications maximum flexibility in data they are able to record.

	mysql> show tables;
	+----------------------+
	\| Tables_in_fxa \|
	+----------------------+
	\| accountResetTokens \|
	\| accounts \|
	\| dbMetadata \|
	\| keyFetchTokens \|
	\| passwordChangeTokens \|
	\| passwordForgotTokens \|

	#!/usr/bin/env bash

	echo "able demo"

	echo -e "\n\n"
	echo "Get all subject attribute names"
	echo "###############################"

	curl -v https://dcoates.dev.lcip.org/ab/v1/fxa_content_server/attributes

	#!/usr/bin/env bash

	echo "able demo"

	echo -e "\n\n"
	echo "Get all subject attribute names"
	echo "###############################"

	curl -v localhost:9798/v1/fxa_content_server/attributes

	{
	"name": "wat",
	"version": "1.0.0",
	"dependencies": {
	"foo": "git://github.com/dannycoates/poolee.git"
	}
	}