Category: Technology, Web & Cloud

The author has a background in computer science and a passion for new technology. When the degree was earned, the web was not too popular yet. That opened an opportunity to follow the entire process with huge fascination, and the journey didn’t end yet. Most of the development happens in Python and Django these days, but all other facets are interesting, too.

  • HTTP/3 

    HTTP over QUIC will be called HTTP/3, following a suggestion by Mark Nottingham.

    Source: HTTP/3 | daniel.haxx.se

  • A quick introduction to web security

    CORS, CSP, HSTS, and all the web security acronyms!link.medium.com/jMrLJYrzBR

  • Celery Worker wide configuration

    Celery is a distributed task execution environment for Python. While the emphasis is on distributed in this software, the concept of having workers allows for settings beyond the individual task. While the first rule of optimisation is “don’t”, sharing database connections is a low hanging fruit in most cases. And this can be configured per worker with Celery provided signals. To create a database connection for individual worker instances, leverage these signals to create the connection when the worker starts.

    This can be achieved leveraging the worker_process_init signal, and the corresponding worker_process_shutdown signal to clean up when the worker shuts down.

    The code should obviously be picked up at worker start, hence the tasks.py file will be a good location to keep these settings.

    Example tasks.py:

    from celery.signals import worker_process_init
    from celery.signals import worker_process_shutdown
    
    app = Celery('tasks', broker=CELERY_BROKER_URL)
    db = None
    
    @worker_process_init.connect
    def init_worker(**kwargs):
      global db
      log.debug('Initializing database connection for worker.')
      db = sqlite3.connect("urls.sqlite")
    
    @worker_process_shutdown.connect
    def shutdown_worker(**kwargs):
      global db
      if db:
        log.debug('Closing database connectionn for worker.')
        db.close()
    

    The example above opens a connection to a sqlite3 database, which in itself has other issues, but is only meant as an example. This connection is established for each individual worker at startup.

  • BOX-256

    Box-256 is a browser game Bildschirmfoto 2016-09-04 um 18.38.57
    where you need to solve
    small tasks, e.g. let a program draw a square, in your browser. Through writing assebly. Since I wrote quite a bit assembly throughout my career, I thought this is interesting. Still, I failed at level one. Mostly because of impatience.

    Source: BOX-256 – Tiny game about writing assembly to pass the graphics tests.

  • Python for Data Analysis

    Für alle Daten, die für Excel zu groß und für Hadoop zu klein sind. Oder um Analysen zu automatisieren, natürlich.

  • Happy Birthday, Fefes Blog

    Das Blog, das, neben Don Alphonso, radikaler als ein Salafisten Forum ist, und allen Internet-Nerds Medienkompetenz vermittelt, wird heute 10 Jahre alt.

    Fefes Blog.

  • Münchner Webwoche

    Die Münchner WebWoche des Isarnetz findet dieses Jahr vom 13.Juni.15 bis zum 21.Juni.15 statt. Erste Veranstaltungen sind im zugehörigen Kalender zu finden.

    Anstehende Events » Münchner Webwoche.

    via

  • Why monitoring is hard

    (and why your vendor will only sell you tools, not solutions)

    Internet wiring

    Intro

    Monitoring infrastructure in a meaningful way is important to any IT operations, yet it is hard to realize. Many vendors adress this problem and promise a silver bullet.

    (more…)