cgoldberg

#!/usr/bin/env bash
#
#  Installer for WebDrivers
#  ------------------------
#  - Binary webdrivers are required to drive Firefox and Chrome browsers from Selenium.
#  - This script will fetch the 64-bit binaries (geckodriver/chromedriver) for MacOS or Linux.

set -e

cgoldberg

#!/bin/bash
# download and install latest geckodriver for linux or mac.
# required for selenium to drive a firefox browser.

install_dir="/usr/local/bin"
json=$(curl -s https://api.github.com/repos/mozilla/geckodriver/releases/latest)
if [[ $(uname) == "Darwin" ]]; then
    url=$(echo "$json" | jq -r '.assets[].browser_download_url | select(contains("macos"))')
elif [[ $(uname) == "Linux" ]]; then
    url=$(echo "$json" | jq -r '.assets[].browser_download_url | select(contains("linux64"))')

cgoldberg

Comparing p-lists (iOS Property List Files)

In OS X and iOS programming frameworks, property list files are used to store information about bundles and applications. Analyzing .plist files can tell you a lot about an application. It is often useful to compare content and view modifications to .plist files to understand what has changed between versions of an application.

---

• list paths of .plist files modified between 2 branches

cgoldberg

"""
Instructions
************

1. install ubuntu deps:
-----------------------
sudo apt-get python-pip
sudo apt-get install firefox
sudo apt-get install chromium-browser

cgoldberg

def num_cpu_cores():
    with open('/proc/cpuinfo') as f:
        return f.read().count('processor')

cgoldberg

import os

def got_root():
    """check if we are running as root."""
    if os.geteuid() == 0:
        return True
    return False

cgoldberg

#!/bin/bash

# Bounce services and print start/stop messages to console and /var/log/syslog.
logger -s Restarting all processes controlled by supervisor now...
logger -s $(/usr/bin/supervisorctl restart all)

# Scheduled by system cron to run every hour:
# 0 */1 * * * /deploy/bounce_services.sh

cgoldberg

SQLite as a test database?

One way to create isolate integration tests is to tear down and recreate database tables for every single test. This ensures every test starts with a clean and known state. However, achieving this with MySQL is an expensive (slow) operation and would add too much execution time between tests.

Tracelons uses SQLAlchemy as an ORM. Since the MySQL database is abtracted behind this layer, we could switch test database providers to SQLite. SQLite can be run in-memory, allowing fast teardowns of the test database. Coupled with fast schema creation, this enables very fast database operations during test runs.

However, there are some drawbacks to using SQLite as a replacement for MySQL during testing:

• Some tooling in the tracelons repo is built specifically for MySQL and would require changes to work with SQLite.
• SQLite does not have the same features, and does not enforce the same rules as MySQL. Therefore, it differs from production and could possibly allow tests to pass t

cgoldberg

#!/usr/bin/env python
#
# walk a directory tree recursively.
# print total file count and size.
# Corey Goldberg, 2015

import os

start_dir = '/mnt/wd-green/Tunes'

cgoldberg

def login(email, password, base_url='https://courses.edx.org'):
    """Login via HTTP and parse sessionid from the cookie."""
    r = requests.get('{}/login'.format(base_url))
    csrf = r.cookies['csrftoken']
    payload = {'email': email, 'password': password}
    cookies = {'csrftoken': csrf}
    headers = {'referer': '{}/login'.format(base_url), 'X-CSRFToken': csrf}
    r = requests.post('{}/user_api/v1/account/login_session/'.format(base_url),
                      data=payload, cookies=cookies, headers=headers)
    try: