9. Heroku tips

   Use an editor

   By default there is no editor on Heroku. To get one, you can use the heroku-nano plugin like this (or by installing as a plugin):

   mkdir bin
   cd bin
   curl https://github.com/Ehryk/heroku-nano/raw/master/heroku-nano-2.5.1/nano.tar.gz --location --silent > nano.tar …

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10. Python tricks

    Sommaire

    • Inspect TLS certificates with requests

    Inspect TLS certificates with requests

    Use the snippet below to capture and inspect the certificates of a distant site and its chain with requests.

    import requests
    
    HTTPResponse = requests.packages.urllib3.response.HTTPResponse
    orig_HTTPResponse__init__ = HTTPResponse.__init__
    def new_HTTPResponse__init__(self, *args, **kwargs):
        orig_HTTPResponse__init__(self, *args, **kwargs …

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11. Deploy to your test server with git hooks

    You probably already wanted to have your own test environment to allow others in the company to tests what you did. Perhaps you have a common one, but as your team is growing, it is probable that the common environment is a bottleneck and you wish each developer could have …

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12. Use dnsmasq with NetworkManager

    This will, for instance, allow you to redirect all matching domains to a certain server: dnsmasq will intercept the DNS query and return the ip you specified.

    To do this, edit NetworkManager configuration in /etc/NetworkManager/NetworkManager.conf and add in the main section dns=dnsmasq:

    [main]
    dns=dnsmasq
    

    You …

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13. VSCode tips

    Sommaire

    • Python
      • venv

    Python

    venv

    To use a venv with VSCode, add in the folder settings:

    {
        "python.pythonPath": "~/.virtualenvs/bureauxlocaux--Uxk5jFn/bin/python",
        "python.unitTest.pyTestEnabled": true
    }
    

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14. Deploy your source maps to Rollbar with Ansible

    I recently had to integrate Rollbar (a service to track errors) with a JS application. One nice thing about Rollbar is that if you provide it with source maps, it will point to you where the error is in the original unminified code.

    Since the application is deployed with Ansible …

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15. Timeout a function in python

    You can use signals and a context manager to acheive this. The idea is to register a function that will raise an exeption when the alarm signal is received and schedule the alarm signal for the timeout.

    import signal
    from contextlib import contextmanager
    
    
    @contextmanager
    def timeout(time):
        # Register a function …

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16. Some tips for django

    Sommaire

    • View last executed query
    • Logging
      • Queries
    • Migrations
      • Checks
      • Fake all pending migrations
    • Model proxies
    • Easily increment migrations numbers
    • Create a widget with custom display
    • Use a nginx reverse proxy in dev
    • Checking PO files
    • Testing
      • Inserting pytest fixtures in a test case
      • Reset PK sequence
      • Reset factoryboy sequence

    View …

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17. JavaScript tips

    Sommaire

    • Normalize an UTF-8 string

    Normalize an UTF-8 string

    Rely on String.prototype.normalize().

    const str = "Crème Brulée"
    str.normalize('NFD').replace(/[\u0300-\u036f]/g, "")
    > 'Creme Brulee'
    

    Source: https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript/37511463#37511463

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18. PostgreSQL tips

    Sommaire

    • Update fields in JSONB format
    • CSV export/import
    • Update rows in bulks
    • Understand lock issues
    • Use variables in query
    • Database sizes

    Update fields in JSONB format

    Use the jsonb_set(COLUMN_NAME, PATH_TO_CHANGE, VALUE) function. The value must be a valid value in JSON (ie use '500' for numbers, 'true' for …

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