A web framework built on Flask & SQLAlchemy. Somewhere North of Flask but South of Django.
Project description
Keg is an opinionated but flexible web framework built on Flask and SQLAlchemy.
Keg’s Goal
The goal for this project is to encapsulate Flask best practices and libraries so devs can avoid boilerplate and work on the important stuff.
We will lean towards being opinionated on the big things (like SQLAlchemy as our ORM) while supporting hooks and customizations as much as possible.
Think North of Flask but South of Django.
Features
Default Logging Configuration
We highly recommend good logging practices and, as such, a Keg application does basic setup of the Python logging system:
Sets the log level on the root logger to INFO
Creates two handlers and assigns them to the root logger:
outputs to stderr
outputs to syslog
Provides an optional json formatter
The thinking behind that is:
In development, a developer will see log messages on stdout and doesn’t have to monitor a file.
Log messages will be in syslog by default and available for review there if no other action is taken by the developer or sysadmin. This avoids the need to manage log placement, permissions, rotation, etc.
It’s easy to configure syslog daemons to forward log messages to different files or remote log servers and it’s better to handle that type of need at the syslog level than in the app.
Structured log files (json) provide metadata details in a easy-to-parse format and should be easy to generate.
The options and output should be easily configurable from the app to account for different needs in development and deployed scenarios.
Keg’s logging setup should be easy to turn off and/or completely override for situations where it hurts more than it helps.
Installation
pip install keg
App Configuration
CLI Command
The command <myapp> develop config will give detailed information about the files and objects
being used to configure an application.
Profile Priority
All configuration classes with the name DefaultProfile will be applied to the app’s config
first.
Then, the configuration classes that match the “selected” profile will be applied on top of the
app’s existing configuration. This makes the settings from the “selected” profile override any
settings from the DefaultProfile.
Practically speaking, any configuration that applies to the entire app regardless of what context
it is being used in will generally go in myapp.config in the DefaultProfile class.
Selecting a Configuration Profile
The “selected” profile is the name of the objects that the Keg configuration handling code will look for. It should be a string.
A Keg app considers the “selected” profile as follows:
If
config_profilewas passed intomyapp.init()as an argument, use it as the selected profile. The--profilecli option uses this method to set the selected profile and therefore has the highest priority.Look in the app’s environment namespace for “CONFIG_PROFILE”. If found, use it.
If running tests, use “TestProfile”. Whether or not the app is operating in this mode is controlled by the use of:
myapp.init(use_test_profile=True)which is used byMyApp.testing_prep()looking in the app’s environment namespace for “USE_TEST_PROFILE” which is used by
keg.testing.invoke_command()
Look in the app’s main config file (
app.config) and all it’s other config files for the variableDEFAULT_PROFILE. If found, use the value from the file with highest priority.
Keg Development
To develop on keg, begin by installing dependencies and running the tests:
git clone https://github.com/level12/keg keg-src cd keg-src cp keg_apps/db/user-config-tpl.py ~/.config/keg_apps.db/keg_apps.db-config.py # edit the DB connection info in this file (you don't have to use vim): vim ~/.config/keg_apps.db/keg_apps.db-config.py pipenv --python=python3.6 pipenv install pipenv run pytest keg
You can then examine tox.ini for insights into our development process. In particular, we:
use
py.testfor testing (and coverage analysis)use
flake8for linting
Preview Readme
When updating the readme, use restview --long-description to preview changes.
Issues & Discussion
Please direct questions, comments, bugs, feature requests, etc. to: https://github.com/level12/keg/issues
Current Status
Stable in a relatively small number of production environments.
API is likely to change with smaller compatibility breaks happening more frequently than larger ones.
Configuration Variables
This is not an exhaustive list of KEG_ specific configuration variables:
KEG_DB_ENGINE_OPTIONS: Add additional engine options to the sqlalchemy.create_engine call when working with a database.
KEG_DB_ENGINE_OPTIONS = { 'json_serializer': flask.json.dumps, 'json_deserializer': flask.json.loads, }
Changelog
0.7.0 released 2019-02-07
Enable setting engine options from KEG variable (5bb807f)
0.6.6 released 2018-11-13
0.6.5 released 2018-05-28
Update readme, start using pipenv, pin Flask < 1.0 (abdc9bf)
0.6.4 released 2018-01-09
when testing, don’t log to syslog by default (304a0a7)
0.6.3 released 2018-01-09
0.6.2 released 2017-12-19
db: get rid of code to replace session object (149b42c)
0.6.1 released 2017-11-16
0.6.0 released 2017-08-18
0.5.1 released 2017-08-15
0.5.0 released 2017-06-27
0.4.1 - 2017-02-09
BUG: Properly quote pgsql identifiers during create (86852ad)
0.4.0 - 2016-12-19
BUG: Properly Update Keyring Config Data (7f1908f)
MSSQL dialect support (df7e89d)
MAINT: Refactor keyring to accept bytes (15bc04b)
MAINT: Remove deprecated flask hooks (4f7e2bf)
Remove unicode_literal futures (dc2fa85)
MAINT: Create windows build environment (983e040)
MAINT: Run CI with Docker (bc7a877)
Remove extra cp in readme (7e94815)
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