Brian Racer anveo

Sends Cloudwatch Event notifications to Slack

What is this?

AWS have released a new featue called CloudWatch Events, which lets you configure events fired by cloudwatch and direct them to SNS, Lambda functions, etc. Here's the blog post

Motivational image:

Here's the motivational image:

If you want a run-down of the 1.3 changes and the design decisions behidn those changes, check out the LonestarElixir Phoenix 1.3 keynote: https://www.youtube.com/watch?v=tMO28ar0lW8

To use the new phx.new project generator, you can install the archive with the following command:

$ mix archive.install https://github.com/phoenixframework/archives/raw/master/phx_new.ez

Bump your phoenix dep

Phoenix v1.3.0 is a backwards compatible release with v1.2.x. To upgrade your existing 1.2.x project, simply bump your phoenix dependency in mix.exs:

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

	#include <math.h>
	#include <algorithm>
	#include <string>
	#include <immintrin.h>
	using namespace std;typedef float R;
	#define _W 79
	#define _H 39
	#define EP 0.01f
	#define OP operator
	#define C const

	Raven.config(dsn, {
	dataCallback(data) {
	const normalize = filename => filename.split('/www/', 2)[1]

	data.exception.values[0].stacktrace.frames.forEach(frame => {
	frame.filename = normalize(frame.filename)
	})

	data.culprit = data.exception.values[0].stacktrace.frames[0].filename

	# Add this snippet to the top of your playbook.
	# It will install python2 if missing (but checks first so no expensive repeated apt updates)
	# [email protected]

	- hosts: all
	gather_facts: False

	tasks:
	- name: install python 2
	raw: test -e /usr/bin/python \|\| (apt -y update && apt install -y python-minimal)

	# Count total EBS based storage in AWS
	aws ec2 describe-volumes \| jq "[.Volumes[].Size] \| add"
	# Count total EBS storage with a tag filter
	aws ec2 describe-volumes --filters "Name=tag:Name,Values=CloudEndure Volume qjenc" \| jq "[.Volumes[].Size] \| add"
	# Describe instances concisely
	aws ec2 describe-instances \| jq '[.Reservations \| .[] \| .Instances \| .[] \| {InstanceId: .InstanceId, State: .State, SubnetId: .SubnetId, VpcId: .VpcId, Name: (.Tags[]\|select(.Key=="Name")\|.Value)}]'
	# Wait until $instance_id is running and then immediately stop it again
	aws ec2 wait instance-running --instance-id $instance_id && aws ec2 stop-instances --instance-id $instance_id

	# Get 10th instance in the account

	<!DOCTYPE html>
	<html lang="en" dir="ltr">
	<head>
	<meta charset="UTF-8">
	<title>Ionic App</title>
	<meta name="viewport"
	content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
	<meta name="format-detection" content="telephone=no">
	<meta name="msapplication-tap-highlight" content="no">

	gem 'stackprof', require: false
	gem 'ruby-prof', require: false

	# 1: Use ruby 2.3.3 as base:
	FROM ruby:2.3.3

	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev

	# 2: We'll set the application path as the working directory
	WORKDIR /usr/src/app

	# 3: We'll set the working dir as HOME and add the app's binaries path to $PATH:
	ENV HOME=/usr/src/app PATH=/usr/src/app/bin:$PATH