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pyramid_runner

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A minimal Pyramid scaffold that aims to provide a starter template to build small to large web services. To achieve this goal the following design decisions are made for you -

  1. Completely decoupled from client-side coding
  2. Use only JSON renderer
  3. Use only url traversal
  4. Focus on resource management

Following packages are included in the setup.py -

  1. Pyramid itself
  2. SQLAlchemy
  3. Alembic

Key Features

  • A predetermined project structure (See Project Structure).
  • Saves hours of google search and typing.
  • Open source and free.
  • IDE (i.o PyCharm) friendly.
  • One configuration file per environment(i.e development and production).
  • A simple Makefile to make life even easier(See the usage of the Makefile).
  • A built-in ModelBase for SQLAlchemy (See features of the ModelBase).
  • Uses CookieCutter project templating system.

Requirements

Installation

After installing cookiecutter, run -

cookiecutter https://github.com/asif-mahmud/pyramid_runner.git

(Obsolete)

  • Create a Python virtual environtment first.
  • Clone the git repo.
  • Open a Terminal inside pyramid_runner.
  • Activate the virtual environtment by running source <your-venv-path>/bin/activate.
  • Run python setup.py install

Project Structure

  • # - Stands for Folder.
  • + - Stands for File.
  • All __init__.py are ignored.
  • All README.md's are ignored.
  • Learn more about the purpose of the folders in their README.md file.
 # project_name
 |
 |-# database
 |
 |-# project_name - Pyramid application code
 | |
 | |-# models
 | |-# views
 | |-# tests
 | |-# security
 | |-# resources - Includes all your resource classes including Root resource.
 |
 |-# alembic
 | |
 | |-# versions
 | |-+ script.py.mako
 | |-+ env.py
 |
 |-# wsgi - Will contain wsgi servers's log files and pid file.
 |
 |-+ setup.py - Python distribution setup file.
 |-+ development.ini - Development environment config file.
 |-+ production.ini - Production environment config file.
 |-+ alembic.ini - Pyramid project friendly alembic config file.
 |-+ MANIFEST.in
 |-+ CHANGES.txt
 |-+ Makefile - Provides some useful shortcut commands.

Usage of Makefile

The Makefile inside the project folder provides some easy shortcut commands-

  • make setup : This command must be run once at the beginnng.
  • make revision: Make a database revision by Alembic.
  • make upgrade : Migrate your database to latest revision.
  • make downgrade : Migrate your database to a previous revision.
  • make run : Run pserve to serve local server. Additionally it will start watching SASS sources and angular apps.
  • make test : Run pytest to test the project.

Features of ModelBase

It is a default Model base for all of your SQLAlchemy Models. But you don't have to inherit it, instead you inherit the infamous Base class. It provides the following class level attributes -

  • id : An Integer Column as primary_key. Feel free to override it anytime.
  • created_on : A DateTime Column to provide when the entry was created. Defaults to current time.
  • updated_on : A DateTime Column to provide when the entry was updated. Always the last update time.
  • __tablename__ : You don't have to write __tablename__ whenever you create a Model
  • __json__ : Method to represent the model as JSON object.

Helper Classes

resources.base.BaseRoot

Root resource inherits this class. See the default resources.root.Root resource.

resources.base.BaseChild

A helper base class for child nodes in the resource tree. __name__ and __parent__ attributes are handled in the __init__ method. So a container child need to implement child_instance and/or child_class (Updated in version 4.0.0) methods of it's own to generate it's requested child node. Decisions made here are -

  1. Parent/Container node is responsible to generate Child node.
  2. Parent/Container node is responsible to give the Child instance a name.

views.base.BaseView

A helper class for view classes. What it does -

  1. Sets the request attribute in __init__ method.
  2. Adds a default empty view for OPTIONS HTTP requests.

views.base.BaseJSONResponse

(new in version 4.0.0) A subclass of dict to provide consistent response from different views. It includes the following keys-

  1. code : An integer code mostly representing HTTP response code. Dafaults 200.
  2. status: A string status like "OK" or "ERROR". Defaults "OK".
  3. msg: A string containing a message for the client. Defaults "".
  4. error: A string containing any error message to send to the client. Defaults "".

These keys can be accessed both as dictionary keys or class attributes.

views.base.BaseStatusReport

(new in version 6.0.0) A subclass of BaseJSONResponse. This is helpful to quickly define a status(error or success) report standard for the API.

security.base.BaseUserRetriever

A base class to retreive authenticated user info from request params.

NOTE: Removed from version 3.9+

security.base.BaseAuthPolicy

Base class for ticket based authentication policy.

NOTE: Removed from version 3.9+

Version History

Version 6.0.1

  • Added log_error method to BaseResource.

Version 6.0.0

  • Added BaseStatusReport and some subclasses of it. See views.errors package.
  • Updated project README.md to better reflect the setup procedure.
  • Fixed some stylings.

Version 5.9.0

  • BaseTest and BaseFunctionalTest is being merged into single BaseTest

Version 5.0.0

  • Little fixes.
  • Added a .gitignore file.

Version 4.9.0

  • Test base class now uses development.ini file to read the configurations. So tests will run with same configurations as the development versions.
  • Initializing database by inserting some test data is made easier by introducing init_db and clean_db methods in BaseTest class. Child classes will just implement these methods to insert test data into database by normal session.add or session.delete methods.

Version 4.0.0

  • More pythonic all the way. Improved import statements.
  • BaseView, BaseChild has more functionalities.

Version 3.9.0

  • Added pyramid_jwt for JWT authentication suitable for CORS.

Version 3.0.0

  • Using Gunicorn instead of waitress as development and production server.

Version 2.9.0

  • Added CORS headers on NewResponse event.

Version 2.0.0

  • Using cookiecutter project templating system.

Version 1.9.0

  • Added a basic stateless security system.

Version 1.0.0

  • ModelBase includes an abstract __json__(request) method.

Version 0.9.0

  • Working version with 3 utility classes -
    1. BaseRoot
    2. BaseChild
    3. BaseView
  • Added an example functional test for home_view.

Version 0.0.1

  • Git initialization.

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Pyramid Scaffold to create web api.

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