mrk21

# @see https://docs.aws.amazon.com/ja_jp/AmazonCloudFront/latest/DeveloperGuide/LocationsOfEdgeServers.html
# @see https://morizyun.github.io/ruby/rails-controller-get-ip.html
# @see https://dev.classmethod.jp/cloud/aws/get-ec2-public-ip-range-by-powershell/
# @see https://github.com/rails/rails/blob/c81af6a/actionpack/lib/action_dispatch/middleware/remote_ip.rb#L112-L150
Rails.application.configure do
  ip_ranges_res = Faraday.get('https://ip-ranges.amazonaws.com/ip-ranges.json')
  ip_ranges = JSON.parse(ip_ranges_res.body)
  cloudfront_ips = ip_ranges['prefixes'].select { |v| v['service'] == 'CLOUDFRONT' }.map { |v| IPAddr.new(v['ip_prefix']) } +
                   ip_ranges['ipv6_prefixes'].select { |v| v['service'] == 'CLOUDFRONT' }.map { |v| IPAddr.new(v['ipv6_prefix']) }

scotteknight

const { environment } = require("@rails/webpacker");

const webpack = require("webpack");

// remove when fixed https://github.com/rails/webpacker/issues/2003
const merge = require("webpack-merge");

const sassLoader = environment.loaders.get("sass");
const cssLoader = environment.loaders.get("css");

sclinede

class DirtyPipeline::Action
  module WrappedCall
    def call
      Events.publish! Event.generate(self)
      super
    end
  end

  class << self
    attr_accessor :attempted_event_klass, :pipeline, :timeout

wrburgess

Optimizing Rails Static Assets on Heroku Cedar

Serving Rails static assets is hard, especially on Heroku Cedar where Heroku forces Rails to serve static assets itself (which isn't particularly performant nor worth your dyno-dollar)---this is different than Heroku Bamboo which used Varnish and is no more. To make the best of the situation, I highly recomend:

1. Using the Heroku-Deflater gem which will selectively gzips assets (it gzips text-based files; and excludes images or binary files, which can actually be bigger when gzipped)

2. Configure your production environment to set cache-control headers and get out of denial about how static assets are being served on Heroku Cedar

3. Use AWS Cloudfront (or a CDN of your choosing) to serve the assets. Cloudfront is great because you can use the same Distribution

ryanermita

Optimistic Locking assumes that a database transaction conflict is very rare to happen. It uses a version number of the record to track the changes. It raise an error when other user tries to update the record while it is lock.

usage

Just add a lock_version column to the table you want to place the lock and Rails will automatically check this column before updating the record.

Pessimistic locking assumes that database transaction conflict is very likely to happen. It locks the record until the transaction is done. If the record is currently lock and the other user make a transaction, that second transaction will wait until the lock in first transaction is release.

usage

eniac111

#!/bin/bash
##
#####################################################################################
# "THE BEER-WARE LICENSE" (Revision 42):
# <blagovest@petrovs.info> wrote this file.  As long as you retain this notice you
# can do whatever you want with this stuff. If we meet some day, and you think
# this stuff is worth it, you can buy me a beer in return.   Blagovest Petrov
#####################################################################################
##

eniac111

#!/bin/bash

########################################################################
## Script for updating Let's encrypt certs
## http://petrovs.info/2015/12/27/My-way-to-auto-update-Lets-Encrypt/
## (C) 2015 Blagovest Petrov (blagovest <at> petrovs dot info)
## Released under the GPL
########################################################################

cd /etc/letsencrypt/live

maxivak

Sending emails with ActionMailer and Sidekiq

Send email asynchroniously using Sidekiq.

ActionMailer

Create your mailer us usual:

jlongster

A lot of people mentioned other immutable JS libraries after reading my post. I thought it would be good to make a list of available ones.

There are two types of immutable libraries: simple helpers for copying JavaScript objects, and actual persistent data structure implementations. My post generally analyzed the tradeoffs between both kinds of libraries and everything applies to the below libraries in either category.

Libraries are sorted by github popularity.

Persistent Data Structures w/structural sharing

scottsb

Guide to Resetting a csync2 Cluster

Introduction

These are possible steps to reset a csync2 cluster that has been seriously fubared. This is an apocalyptic approach and should only be used when more surgical fixes (like correcting an individual conflict) aren't workable.

Use Cases