Metadata-Version: 1.1
Name: django-ddp
Version: 0.9.2
Summary: Django/PostgreSQL implementation of the Meteor DDP service.
Home-page: https://github.com/commoncode/django-ddp
Author: Tyson Clugg
Author-email: tyson@clugg.net
License: UNKNOWN
Description: django-ddp
        ==========
        
        Django_/PostgreSQL_ implementation of the Meteor DDP service, allowing Meteor_ to subscribe to changes on Django_ models.  Released under the MIT license.
        
        
        Requirements
        ------------
        The core concept is that events are dispatched asynchronously to browsers using WebSockets_ and server-side using a PostgreSQL_ extension to the SQL syntax called NOTIFY (and its bretheren, LISTEN and UNLISTEN).  You must be using PostgreSQL_ with psycopg2_ in your Django_ project for django-ddp to work.  There is no requirement on any asynchronous framework such as Reddis or crossbar.io as they are simply not needed given the asynchronous support provided by PostgreSQL_ with psycopg2_.  As an added bonus, events dispatched using NOTIFY in a transaction are only emitted if the transaction is successfully committed.
        
        
        Scalability
        -----------
        All database queries to support DDP events are done once by the server instance that has made changes via the Django ORM.  Django DDP multiplexes messages for active subscriptions, broadcasting an aggregated change message on channels specific to each Django model that has been published.
        
        Peer servers subscribe to aggregate broadcast events which are de-multiplexed and dispatched to individual client connections.  No additional database queries are required for de-multiplexing or dispatch by peer servers.
        
        
        Limitations
        -----------
        * No support for the SockJS protocol to support browsers that
          don't have WebSockets_ (see http://caniuse.com/websockets for
          supported browsers).
        
        * Changes must be made via the Django ORM as django-ddp uses `Django
          signals`_ to receive model save/update signals.
        
        
        Installation
        ------------
        
        Install the latest release from pypi (recommended):
        
        .. code:: sh
        
            pip install django-ddp
        
        Clone and use development version direct from GitHub (to test pre-release code):
        
        .. code:: sh
        
            pip install -e git+https://github.com/commoncode/django-ddp@develop#egg=django-ddp
        
        
        Example usage
        -------------
        
        Add 'dddp' to your settings.INSTALLED_APPS:
        
        .. code:: python
        
            # settings.py
            ...
            INSTALLED_APPS = list(INSTALLED_APPS) + ['dddp']
        
        If you'd like support for the Meteor Accounts package (ie: login/logout
        with django.contrib.auth) consult the section on authentication below
        and use the following line instead:
        
        .. code:: python
        
            # settings.py
            ...
            INSTALLED_APPS = list(INSTALLED_APPS) + ['dddp', 'dddp.accounts']
        
        Add ddp.py to your Django application:
        
        .. code:: python
        
            # bookstore/ddp.py
        
            from dddp.api import API, Collection, Publication
            from bookstore import models
        
            class Book(Collection):
                model = models.Book
        
        
            class Author(Collection):
                model = models.Author
        
        
            class AllBooks(Publication):
                queries = [
                    models.Author.objects.all(),
                    models.Book.objects.all(),
                ]
        
        
            class BooksByAuthorEmail(Publication):
                def get_queries(self, author_email):
                    return [
                        models.Author.objects.filter(
                            email=author_email,
                        ),
                        models.Book.objects.filter(
                            author__email=author_email,
                        ),
                    ]
        
        
            API.register(
                [Book, Author, AllBooks, BooksByAuthorEmail]
            )
        
        Connect your Meteor application to the Django DDP service:
        
        .. code:: javascript
        
            // bookstore.js
            if (Meteor.isClient) {
                // Connect to Django DDP service
                Django = DDP.connect('http://'+window.location.hostname+':8000/');
                // Create local collections for Django models received via DDP
                Authors = new Mongo.Collection("bookstore.author", {connection: Django});
                Books = new Mongo.Collection("bookstore.book", {connection: Django});
                // Subscribe to all books by Janet Evanovich
                Django.subscribe('BooksByAuthorEmail', 'janet@evanovich.com');
            }
        
        Start the Django DDP service:
        
        .. code:: sh
        
            DJANGO_SETTINGS_MODULE=myproject.settings dddp
        
        In a separate terminal, start Meteor (from within your meteor
        application directory):
        
        .. code:: sh
        
            meteor
        
        
        Adding API endpoints (server method definitions)
        ------------------------------------------------
        API endpoints can be added by calling `register` method of the
        dddp.api.API object from the ddp.py module of your Django app, on a
        subclass of dddp.api.APIMixin - both dddp.api.Collection and
        dddp.api.Publication are suitable, or you may define your own subclass
        of dddp.api.APIMixin.  A good example of this can be seen in
        dddp/accounts/ddp.py in the source of django-ddp.
        
        
        Authentication
        --------------
        Authentication is provided using the standard meteor accounts system,
        along with the `accounts-secure` package which turns off Meteor's
        password hashing in favour of using TLS (HTTPS + WebSockets). This
        ensures strong protection for all data over the wire.  Correctly using
        TLS/SSL also protects your site against man-in-the-middle and replay
        attacks - Meteor is vulnerable to both of these without using
        encryption.
        
        Add `dddp.accounts` to your `settings.INSTALLED_APPS` as described in
        the example usage section above, then add `tysonclugg:accounts-secure`
        to your Meteor application (from within your meteor application
        directory):
        
        .. code:: sh
        
            meteor add tysonclugg:accounts-secure
        
        Then follow the normal procedure to add login/logout views to your
        Meteor application.
        
        
        Contributors
        ------------
        `Tyson Clugg <https://github.com/tysonclugg>`_
            * Author, conceptual design.
        
        `MEERQAT <http://meerqat.com.au/>`_
            * Project sponsor - many thanks for allowing this to be released under an open source license!
        
        `David Burles <https://github.com/dburles>`_
            * Expert guidance on how DDP works in Meteor.
        
        `Brenton Cleeland <https://github.com/sesh>`_
            * Great conversations around how collections and publications can limit visibility of published documents to specific users.
        
        `Muhammed Thanish <https://github.com/mnmtanish>`_
            * Making the `DDP Test Suite <https://github.com/meteorhacks/ddptest>`_ available.
        
        .. _Django: https://www.djangoproject.com/
        .. _Django signals: https://docs.djangoproject.com/en/stable/topics/signals/
        .. _PostgreSQL: http://postgresql.org/
        .. _psycopg2: http://initd.org/psycopg/
        .. _WebSockets: http://www.w3.org/TR/websockets/
        .. _Meteor: http://meteor.com/:0
        
Platform: UNKNOWN
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: Internet :: WWW/HTTP
Classifier: Topic :: Software Development :: Libraries
