Oleksandr Kirpachov kirpachov

Setup Postgresql database replica

Per migrare da un database ad un altro può essere necessario prima di scambiare le connessioni creare il nuovo database come "replica" dell'originale. In questo modo, al momento della migrazione i due database saranno identici e permetterà downtime pari a zero.

Nel master

Il 'master' è il database attualmente in uso.

... TODO ...

Active storage

Does not save files to disk until commit.

Post.transaction do
  # This one is ok. Returns true.
  @post.attachments.attach(io: StringIO.new("something...."), filename: "new-post.txt", content_type: "plain/text")
  
  # This would raise ActiveStorage::FileNotFound error.
  # Plus, you won't find any new file in the filesystem until commit.
 # @post.attachments.last.download

Try this in your rails console with rails c:

Sidekiq.redis{|r| r.get("stat:processed") }

some_data = Sidekiq.redis { |conn|
    conn.pipelined do
    conn.get("stat:processed")
    conn.get("stat:failed")
 conn.zcard("schedule")

Tunneling http with caddy

You can expose a http port from a private network using caddy and ssh

Getting started

Set up the server
Set up the client
Navigate to your host.

Server

Server must be a pc or a server with a static public ip and a nameserver.

	# frozen_string_literal: true

	require 'sidekiq/web'
	require 'sidekiq/cron/web'
	require 'sidekiq-status/web'

	Rails.application.routes.draw do # rubocop:disable Metrics/BlockLength
	mount RoutesBasicAuth.call(
	Sidekiq::Web,
	username: ENV["BASIC_AUTH_USERNAME"],

	require "rails_helper"

	RSpec.describe Something do
	# ...
	around do \|example\|
	ActiveJob::Base.queue_adapter.perform_enqueued_jobs = true
	example.run
	ActiveJob::Base.queue_adapter.perform_enqueued_jobs = false
	end
	end

	# Add Docker's official GPG key: 1
	sudo apt-get update
	sudo apt-get install ca-certificates curl
	sudo install -m 0755 -d /etc/apt/keyrings
	sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
	sudo chmod a+r /etc/apt/keyrings/docker.asc

	# Add the repository to Apt sources:
	echo \
	"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \

	# -- mode: ruby --
	# vi: set ft=ruby :

	# All Vagrant configuration is done below. The "2" in Vagrant.configure
	# configures the configuration version (we support older styles for
	# backwards compatibility). Please don't change it unless you know what
	# you're doing.
	Vagrant.configure("2") do \|config\|
	# The most common configuration options are documented and commented below.
	# For a complete reference, please see the online documentation at

	/**
	* Emit each element of array as single event.
	*/
	const array$: Subject<string[]> = new Subject<string[]>();

	const each$: Observable<string> = array$.pipe(
	tap((v: string[]) => console.log('array', v)),
	switchMap((array: string[]) => merge(...(array.map((item: string) => of(item))))),
	tap((v: string) => console.log('each', v)),
	);

	function get_html(){
	echo $(cat $filename \| sed 's/<!--.-->//g' \| sed 's/\/.\\///g' \| sed 's/\/\/.*$//gm')
	}