mrsinguyen

Git DMZ Flow

I've been asked a few times over the last few months to put together a full write-up of the Git workflow we use at RichRelevance (and at Precog before), since I have referenced it in passing quite a few times in tweets and in person. The workflow is appreciably different from GitFlow and its derivatives, and thus it brings with it a different set of tradeoffs and optimizations. To that end, it would probably be helpful to go over exactly what workflow benefits I find to be beneficial or even necessary.

• Two developers working on independent features must never be blocked by each other
  • No code freeze! Ever! For any reason!
• A developer must be able to base derivative work on another developer's work, without waiting for any third party
• Two developers working on inter-dependent features (or even the same feature) must be able to do so without interference from (or interfering with) any other parties
• Developers must be able to work on multiple features simultaneously, or at lea

mrsinguyen

<?php 
// Add to use-statements
use Symfony\Component\HttpFoundation\Response;

// [...] Your application code

// Action to return XML from Twig-Template
$app->get(
    '/sitemap.xml',
    function () use ($app) {

mrsinguyen

// Bytecode origin https://www.reddit.com/r/ethereum/comments/6ic49q/any_assembly_programmers_willing_to_write_a/dj5ceuw/
// Modified version of Vitalik's https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/
// Credits to Jordi Baylina for this way of deploying contracts https://gist.github.com/jbaylina/e8ac19b8e7478fd10cf0363ad1a5a4b3

// Forwarder is slightly modified to only return 256 bytes (8 normal returns)

// Deployed Factory in Kovan: https://kovan.etherscan.io/address/0xaebc118657099e2110c90494f48b3d21329b23eb

// Example of a Forwarder deploy using the Factory: https://kovan.etherscan.io/tx/0xe995dd023c8336685cb819313d933ae8938009f9c8c0e1af6c57b8be06986957
// Just 66349 gas per contract

mrsinguyen

Many initiatives are raising capital via initial coin offerings (ICOs). The Ethereum (ETH) project raised 18 million dollars and the DAO project raised 150 million of dollars! Furthermore, the entire blockchain space is worth over 90 billion dollars! I will describe ICOs and their custom cryptocurrencies on Ethereum Classic (ETC).

ICO Basics

An ICO is a method of raising funds via the sale of a new cryptocurrency. These cryptocurrencies are often required to purchase goods and services from the issuing organizations. For example, the ETH cryptocurrency (ether) is used to rent ETH system resources. Typically ICOs are announced on Bitcointalk.org forums and heavily marketed beforehand. Buyers often purchase new cryptocurrencies by sending bitcoins or ether to an escrow account. Organizations set the initial prices then supply and demand determines the

mrsinguyen

// Safari, in Private Browsing Mode, looks like it supports localStorage but all calls to setItem
// throw QuotaExceededError. We're going to detect this and just silently drop any calls to setItem
// to avoid the entire page breaking, without having to do a check at each usage of Storage.
if (typeof localStorage === 'object') {
    try {
        localStorage.setItem('localStorage', 1);
        localStorage.removeItem('localStorage');
    } catch (e) {
        Storage.prototype._setItem = Storage.prototype.setItem;
        Storage.prototype.setItem = function() {};

mrsinguyen

if (localStorage && !localStorage.getItem('size')) {
    var i = 0;
    try {
        // Test up to 10 MB
        for (i = 250; i <= 10000; i += 250) {
            localStorage.setItem('test', new Array((i * 1024) + 1).join('a'));
        }
    } catch (e) {
        localStorage.removeItem('test');
        localStorage.setItem('size', i - 250);

mrsinguyen

Web Components Resources

Specs / standardization

W3C Introduction to Web Components - explainer/overview of the technologies

• Custom Elements
• HTML Imports
• Shadow DOM
• CSS Scoping Module

mrsinguyen

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

mrsinguyen

#!/bin/bash

# Give the usual warning.
clear;
echo "[INFO] Automated Android root script started.\n\n[WARN] Exploit requires sdk module \"NDK\".\nFor more information, visit the installation guide @ https://goo.gl/E2nmLF\n[INFO] Press Ctrl+C to stop the script if you need to install the NDK module. Waiting 10 seconds...";
sleep 10;
clear;

# Download and extract exploit files.
echo "[INFO] Downloading exploit files from GitHub...";

mrsinguyen

These files were used to create the benchmarks for the release of upscaledb-mysql 0.0.1.

=== sysbench

Use sysbench 1.0. The shell script loads and runs the tests.
I ran various tests - with and without transactions, with LOCK TABLE etc. Results are in sysbench-results.txt.

=== uqi1

This script performs a `SELECT COUNT(*) FROM table`. The table was from TPC-C order_line with 6 million rows.