Nicolas Marshall nmrshll

Initialising Empty Structs in Rust

In C/C++, you can initialise a struct without giving values for any of the fields:

struct Point {
  float x;
  float y;
  float z;
};

Working with ansible-vault

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

In-Application Sandboxing with Web Workers

A design rationale.

For the past fews years, the Web has been shifting control to the client. Given the limitations of remote services, developers are now looking for ways to "unhost" static applications – that is, break the dependency on remote servers while still using the Web platform.

One untapped technology for client-side control is the Web Worker Sandbox. This API lets the Page load, execute, and destroy separate Worker threads which use their own Virtual Machines. By using Worker Sandboxes to drive behavior, the Web can give users the choice of which software they run together, shifting development from a centralized SaaS model into a distributed and free (as in freedom) script-sharing model.

Worker Sandboxes can Execute Arbitrary Code

Update May 2017

Eric Bidelman has documented some of the common workflows possible with headless Chrome over in https://developers.google.com/web/updates/2017/04/headless-chrome.

Update

If you're looking at this in 2016 and beyond, I strongly recommend investigating real headless Chrome: https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md

Windows and Mac users might find using Justin Ribeiro's Docker setup useful here while full support for these platforms is being worked out.

	# Pass the env-vars to MYCOMMAND
	eval $(egrep -v '^#' .env \| xargs) MYCOMMAND
	# … or ...
	# Export the vars in .env into your shell:
	export $(egrep -v '^#' .env \| xargs)

	package main

	import (
	"context"
	"crypto/tls"
	"fmt"
	"log"
	"net/http"
	"net/url"
	"time"

	dash_id=xxxx
	api_key=xxx
	app_key=xxx

	# 1. export
	curl -X GET "https://app.datadoghq.com/api/v1/dash/${dash_id}?api_key=${api_key}&application_key=${app_key}" > dash.json

	# 2. edit dash.json
	move "graphs", "title", "description" up one level in the json hierarchy, from being beneath "dash" to being at the same level

	fn main() {

	let closure_immutable_pure = \|x: i32\| x + 1;

	let result1 = apply_pure(& closure_immutable_pure, 1);
	// let result2 = apply_mut(&mut closure_immutable_pure, 2); // not typeable
	let result3 = apply_once(closure_immutable_pure, 3);

	let mut closure_mutable_pure = \|x: i32\| x + 1;

	package main

	import (
	"fmt"
	"log"
	"math/rand"
	"regexp"
	"strconv"
	"strings"
	"time"

	function string_to_slug (str) {
	str = str.replace(/^\s+\|\s+$/g, ''); // trim
	str = str.toLowerCase();

	// remove accents, swap ñ for n, etc
	var from = "àáäâèéëêìíïîòóöôùúüûñç·/_,:;";
	var to = "aaaaeeeeiiiioooouuuunc------";
	for (var i=0, l=from.length ; i<l ; i++) {
	str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
	}