python-rest-handler

Latest version: 0.0.2 (2013/04/28)

A simple and abstract library to create Rest Handlers for different Web frameworks and ORMs.

This project was born from Tornado Rest Handler (https://github.com/paulocheque/tornado-rest-handler). It is an abstract layer of that project to allow the code be used by another Web frameworks.

• Basic Example of Usage
  • Routes
  • Data Managers
  • Handlers
  • Templates
• Plugins
• Installation
• Change Log
• TODO

Basic Example of Usage

To use the rest handler logic, it is necessary to implement a python_rest_handler.RestRequestHandler class and at least one DataManager. Then it is possible to use the rest_routes fabric method or it is possible to inherit your request handler manually. Check the next sections for more details.

PS: The project Tornado Rest Handler (https://github.com/paulocheque/tornado-rest-handler) contains a real example.

Handlers

To create a handler for your Web framework, you need to create a subclass of RestRequestHandler

import python_rest_handler

class YourRequestRestHandler(YOUR_FRAMEWORK_BASE_HANDLER, python_rest_handler.RestRequestHandler):
    def raise403(self): pass
    def raise404(self): pass
    def get_request_uri(self): pass
    def get_request_data(self): return {}
    def render(self, template_name, **kwargs): pass
    def redirect(self, url, permanent=False, status=None, **kwargs): pass

All the get/post/put/delete methods are implemented for you, but you need to link them with your Framework's Request Handler:

    def get(self, instance_id=None, edit=False): # or other method here
    	# next line is the required link
        return self.rest_handler.get(instance_id=instance_id, edit=edit)

    def post(self, instance_id=None, action=None): # or other method here
	    # next line is the required link
        return self.rest_handler.post(instance_id=instance_id, action=action)

    def put(self, instance_id): # or other method here
	    # next line is the required link
        return self.rest_handler.put(instance_id=instance_id)

    def delete(self, instance_id): # or other method here
	    # next line is the required link
        return self.rest_handler.delete(instance_id=instance_id)

Just be sure that a RestRequestHandler requires a model and DataManager to be instantiated.

Until this moment, this library include just a simple DataManager for the MongoEngine.

Data Managers

To create a Data Manager for your ORM you must override the DataManager class and implement the following methods:

from python_rest_handler import DataManager

class YourDataManager(DataManager):
    def instance_list(self): return []
    def find_instance_by_id(self, instance_id): pass
    def save_instance(self, data): pass
    def update_instance(self, instance, data): pass
    def delete_instance(self, instance): pass

After that, you may use the Data Manager in any RequestRestHandler you want to:

class YourRequestRestHandler(python_rest_handler.RequestRestHandler):
    data_manager = YourDataManager

Tip: You can create a general data manager, and let the user subclass your DataManager when he/she wants to customize some behavior, for example:

class AnimalDataManager(YourDataManager):
    def instance_list(self):
        return Animal.objects.filter(user=current_user)

Routes

One handler manage every Rest routes:

*Since HTML5-forms does not support PUT/DELETE, these additional POSTs were added.

To specify the Rest routes in your Web framework you can use the method rest_routes:

import python_rest_handler

class SomeImplementationOfRestHandler(BASE_CLASS_OF_YOUR_FRAMEWORK, python_rest_handler.RestRequestHandler): pass

ROUTES = python_rest_handler.rest_routes(Animal, YourDataManager, YourRequestRestHandler),

The routes is a useful function in case you want to include a call of the rest_routes function inside of a list. It just flat the list with depth 1.

ROUTES = python_rest_handler.routes(ROUTES)

The library does not support auto-pluralization yet, so you may want to change the prefix:

ROUTES = rest_routes(Animal, prefix='animals')

You can also define to where will be redirect after an action succeed:

ROUTES = rest_routes(Animal, prefix='animals', redirect_pos_action='/animals')

Templates

You must create your own template. Templates will receive the variables obj or objs and alert in case there is some message. The edit template will also receive the variable errors and functions value_for, error_for and has_error.

It must have the names list.html, show.html and edit.html. But you can customize if you want to:

rest_routes(Animal, list_template='another_name.html', edit_template='...', show_template='...'),

By default, the directory is the model name in lower case (animal in this example).

• animal/list.html
• animal/show.html
• animal/edit.html

But you may change the directory though:

rest_routes(Animal, template_path='your_template_path'),

Plugins

You can pass additional functions to your templates. This library include functions that generate widgets according to a Twitter-Bootstrap template.

from python_rest_handler.plugins.bootstrap import *

extra_attributes = {'bs_input_text': bs_input_text,
                    'bs_input_password':bs_input_password,
                    'bs_select_field':bs_select_field,
                    'bs_button':bs_button}

rest_routes(Animal, extra_attributes=extra_attributes),

Installation

pip install python-rest-handler

or

1. Download zip file
2. Extract it
3. Execute in the extracted directory: python setup.py install

Development version

pip install -e [email protected]:paulocheque/python-rest-handler.git#egg=python-rest-handler

requirements.txt

python-rest-handler==0.0.2
# or use the development version
git+git://github.com/paulocheque/python-rest-handler.git#egg=python-rest-handler

Upgrade:

pip install python-rest-handler --upgrade --no-deps

Requirements

• Python 2.6 / 2.7 / 3.2 / 3.3

Change Log

0.0.2 (2013/04/28)

• [new] Bootstrap plugin has two more functions: bs_text_area and bs_input_file.
• [new] Now it is possible to select which routes and actions you want to create, using the only and exclude parameter. Options are: new, show, list, edit and delete
• [new] Now is possible to activate and deactivate plugins for all rest_routes using the activate_plugin and deactivate_plugin methods.
• [bugfix] The selected_value for bs_select_field in the Bootstrap plugin now convert the value to string.
• [bugfix] Fixed setup.py dependencies.
• [optimization] Regular expressions are now pre-compiled.

0.0.1 (2013/03/30)

• [important] This project is an abstraction of tornado-rest-handler. Now tornado-rest-handler will use this project.
• [new] It has all features of tornado-rest-handler 0.0.5 (besides the Tornado Request Manager and MongoEngine Data Manager).
• [new] Plugin support.
• [new] Bootstrap plugin: bs_input_text, bs_input_password, bs_select_field, bs_button.

TODO

• Pagination
• i18n
• pluralize urls
• bootstrap plugin: delete button, edit button