sescobb27

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

sescobb27

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host

sescobb27

#!/usr/bin/env ruby

require 'net/http'
require 'json'

def create_deployment(sha)
  uri = URI('https://api.github.com/repos/envoy/garaje/deployments')
  req = Net::HTTP::Post.new(uri.path, {
    'Content-Type' => 'application/json',
    'Authorization' => "token #{ENV['GITHOUT_OAUTH_TOKEN']}"

sescobb27

web: node app.js
worker: node consumer.js

sescobb27

Functional Track talks from NDC Oslo 2016

Wednesday 2016-06-08

• What every Node.js developer needs to know about Elixir - Bryan Hunter
• F# in the Real World - Yan Cui
• Functional Programming for Mobile Apps - Frank A. Krueger
• Phoenix a web framework for the new web - José Valim
• REPL Driven Development, Scrum, and the Wright Brothers - Jamie Dixon

sescobb27

$http({
    url: '/api/v1/reports/age-gender',
    method: 'GET',
    responseType: 'arraybuffer'
})
.success(function (data, status) {
    var file = new Blob([data], {
        type: 'application/pdf'
    });
    var fileURL = URL.createObjectURL(file);

sescobb27

%%% This macro will create a function that converts a record to
%%% a {key, value} list (a proplist)

-define(record_to_list(Record),
    fun(Val) ->
        Fields = record_info(fields, Record),
        [_Tag| Values] = tuple_to_list(Val),
        lists:zip(Fields, Values)
    end
).

sescobb27

%%%   This is a clever Erlang macro that given a record name will create a new function
%%%   that converts from a property list to the record (which really is a taged tuple).

-define(proplist_to_record(Record),
   fun(Proplist) ->
       Fields = record_info(fields, Record),
       [Tag| Values] = tuple_to_list(#Record{}),
       Defaults = lists:zip(Fields, Values),
       L = lists:map(fun ({K,V}) -> proplists:get_value(K, Proplist, V) end, Defaults),
       list_to_tuple([Tag|L])

sescobb27

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: '', // Does not let Ember inject HTML into the component.
  routing: Ember.inject.service('-routing'),
  breadcrumbs: Ember.computed('routing.currentRouteName', function () {
    let routeName = this.get('routing.currentRouteName');

    let routeNames = routeName.split('.');
    let len = routeNames.length;

sescobb27

module JsonApi
  class Relationships
    def initialize(record, payload, id_attr: :uuid)
      @record = record
      @payload = payload
      @id_attr = id_attr
    end

    def set_relationships(*relations_names)
      relations_names = Array.wrap(relations_names)