charlesroper

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

beginor

CREATE SEQUENCE public.global_id_seq;
ALTER SEQUENCE public.global_id_seq OWNER TO postgres;

CREATE OR REPLACE FUNCTION public.id_generator()
    RETURNS bigint
    LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
    our_epoch bigint := 1314220021721;
    seq_id bigint;

ErikAugust

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif

acdlite

Demo: Coordinating async React with non-React views

tl;dr I built a demo illustrating what it might look like to add async rendering to Facebook's commenting interface, while ensuring it appears on the screen simultaneous to the server-rendered story.

A key benefit of async rendering is that large updates don't block the main thread; instead, the work is spread out and performed during idle periods using cooperative scheduling.

But once you make something async, you introduce the possibility that things may appear on the screen at separate times. Especially when you're dealing with multiple UI frameworks, as is often the case at Facebook.

How do we solve this with React?

ebachter

import React from 'react';
import { connect } from 'react-redux';

class PageWidget extends React.Component {
  componentDidMount() {
    this.ifr.onload = () => {
      this.ifr.contentWindow.postMessage('hello', '*');
    };
    window.addEventListener("message", this.handleFrameTasks);
  }

marianogappa

/*
This snippet is an example of backpressure implementation in Go.
It doesn't run in Go Playground, because it starts an HTTP Server.

The example starts an HTTP server and sends multiple requests to it. The server starts denying
requests by replying an "X" (i.e. a 502) when its buffered channel reaches capacity.

This is not the same as rate-limiting; you might be interested in https://github.com/juju/ratelimit
or https://godoc.org/golang.org/x/time/rate.

xcsrz

traceroute 8.8.8.8|awk -F[\(\)] '$2~/[0-9]/{print $2}'|while read i;do whois $i | awk -F ":\s*" '/^(OrgName|City|State|Country)/ {gsub(/^[ \t]+|[ \t]+$/, "", $2); printf $2" "}'; echo $i; done

miroslav-mrazek

<?php

namespace App\Model\Data;

use Nette\Application\UI\Form;


class FooFormFactory
{
	

fprochazka

{
	"functionCalls": [
		{
			"function": "\\array_diff_assoc",
			"position": 0
		},
		{
			"function": "\\array_diff_key",
			"position": 0
		},

brandt

Loopback Alias

Creates an alias on the loopback interface (lo0) with the IP 127.0.0.2 on macOS.

Installation

1. Install the plist to: /Library/LaunchDaemons/com.runlevel1.lo0.127.0.0.2.plist
2. Set mode: sudo chmod 0644 /Library/LaunchDaemons/com.runlevel1.lo0.127.0.0.2.plist
3. Set owner: sudo chown root:wheel /Library/LaunchDaemons/com.runlevel1.lo0.127.0.0.2.plist
4. Load: sudo launchctl load /Library/LaunchDaemons/com.runlevel1.lo0.127.0.0.2.plist