dustinlennon

Site CA

generate rsa private key

openssl genpkey -algorithm RSA -quiet -out $cert_output_path/site.key

create site CA

dustinlennon

Run ipython in Microsoft Visual Studio Code

It can be useful to run ipython in a terminal, copying and pasting code snippets as part of the development workflow. Here's how to integrated this pattern into VS Code.

create an integrated terminal profile

Add the following to settings.json:

dustinlennon

{
    "editor.minimap.enabled": false,
    "terminal.integrated.fontSize": 13,
    "[markdown]": {
        "editor.unicodeHighlight.ambiguousCharacters": false,
        "editor.unicodeHighlight.invisibleCharacters": false,
        "diffEditor.ignoreTrimWhitespace": false,
        "editor.wordWrap": "bounded",
        "editor.wordWrapColumn": 100,
        "editor.quickSuggestions": {

dustinlennon

#!/bin/bash
#
# Mirror directory structures on remote and local machines.
#
# This requires "mirror" accounts with sudo privileges having NOPASSWD for 
# /usr/bin/rsync.  This enables rsync to read/write files not owned by the 
# mirror.  The corresponding sudoers entry (visudo sudoers):
#
#   mirror ALL=(ALL) NOPASSWD: /usr/bin/rsync
#

dustinlennon

"""
A simple reservoir sampler class adapted from Wikipedia pseudocode.
  cf. https://en.wikipedia.org/wiki/Reservoir_sampling
"""

import numpy as np

class ReservoirSampler(object):
  def __init__(self, seed : int = None):
    self.rng = np.random.default_rng(seed = seed)

dustinlennon

#!/usr/bin/env python3
"""Generate a QR code from a URL

usage: qr.py [-h] [--url URL] [--interactive] [--output OUTPUT] [--size SIZE]

options:
  -h, --help       show this help message and exit
  --url URL
  --interactive
  --output OUTPUT  a PNG file

dustinlennon

"""A fork and monitor pattern, asyncio with named sockets

author: Dustin Lennon
email: dustin.lennon@gmail.com

Generate heartbeats in a parent process; check heartbeats in a child process. The 
most recent heartbeat is saved in a file.  The child exits when the parent terminates,
specifically when its parent pid changes.

This code also sets up a named socket in the filespace which enables shell interaction with