hakuno

Laravel's Dependency Injection Container in Depth

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

Accessing the Container

hakuno

<?php

namespace App\Http\Controllers;

use Symfony\Component\HttpFoundation\BinaryFileResponse; // http://api.symfony.com/4.0/Symfony/Component/HttpFoundation/BinaryFileResponse.html
use Symfony\Component\HttpFoundation\File\Stream; // https://api.symfony.com/3.4/Symfony/Component/HttpFoundation/File/Stream.html
use SplFileObject;
use Exception;

// https://symfony.com/doc/current/components/http_foundation.html

hakuno

It's useful whenever your lastest version of Fedora has no Docker on its repository.

For instance, Fedora 30 had no Docker (stable) available when released.

Then, you can go with the test version.

Prepare

sudo dnf -y update
sudo dnf -y install dnf-plugins-core

hakuno

#!/bin/bash
if ! [ -x "$(command -v docker)" ]
then
  echo "⛔  Oh, my Gosh! You don't even have Docker on it."
  exit 1;
else
  sudo systemctl start docker
fi

if [ "$(egrep --color 'vmx|svm' /proc/cpuinfo)" == "" ]

hakuno

<?php

require_once __DIR__.'/../vendor/autoload.php';

// Look for
// https://github.com/laravel/lumen/pull/132

// PoC
// Illuminate\Support\Env::disablePutenv();

hakuno

*LOCALHOST|TEST PURPOSE ONLY*

# Exemplo 2
# Ou exemplo "Docker Compose"
https://www.zabbix.com/documentation/3.0/manual/installation/containers

# Link'em all
docker network create zabbix

# Banco de dados

hakuno

Determinado usuário Linux tem "blank screen" após login.

sudo find . -type f -name "*displays*"
mv ~/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml ~/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml.bak
sudo reboot

OU

mv $(sudo find . -type f -name "*displays*") /opt/displays.xml.bak

hakuno

Example
client$ iptables -I INPUT 1 --src 192.168.254.0/24 -j ACCEPT
client$ iptables -t raw -I PREROUTING 1 --src 192.168.254.0/24 -j NOTRACK
server$ iptables -I INPUT 1 --src 192.168.254.0/24 -j ACCEPT
server$ iptables -t raw -I PREROUTING 1 --src 192.168.254.0/24 -j NOTRACK

Example
receiver$ iptables -I INPUT 1 -p udp --dport 4321 -j ACCEPT
receiver$ iptables -t raw -I PREROUTING 1 -p udp --dport 4321 -j NOTRACK

hakuno

# I found at https://dreisbach.us/articles/simple-ansible-makefile/
# Replace this
# ansible-playbook -i hosts --vault-password-file=.vault-password.txt site.yml
# For this

tags = $(subst roles/,,$(wildcard roles/*))
.PHONY: all $(tags)
all:
	ansible-playbook -i hosts --vault-password-file=.vault-password.txt site.yml
$(tags):

hakuno

# fix work iconv library with alphine
RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ --allow-untrusted gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php