| defmodule Expng do | |
| defstruct [:width, :height, :bit_depth, :color_type, :compression, :filter, :interlace, :chunks] | |
| def png_parse(<< | |
| 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, | |
| _length :: size(32), | |
| "IHDR", | |
| width :: size(32), | |
| height :: size(32), |
A running example of the code from:
This gist creates a working example from blog post, and a alternate example using simple worker pool.
TLDR: if you want simple and controlled concurrency use a worker pool.
| /** | |
| * Fancy ID generator that creates 20-character string identifiers with the following properties: | |
| * | |
| * 1. They're based on timestamp so that they sort *after* any existing ids. | |
| * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs. | |
| * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly). | |
| * 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the | |
| * latter ones will sort after the former ones. We do this by using the previous random bits | |
| * but "incrementing" them by 1 (only in the case of a timestamp collision). | |
| */ |
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
| package main | |
| import ( | |
| "github.com/codegangsta/martini" | |
| "github.com/codegangsta/martini-contrib/binding" | |
| "github.com/codegangsta/martini-contrib/render" | |
| "labix.org/v2/mgo" | |
| ) | |
| type Wish struct { |
| # to generate your dhparam.pem file, run in the terminal | |
| openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048 |
