Strategies

Different strategies are defined to encapsulate the different frameworks capabilities under a common API to reuse as much code as possible.

Description

A strategy’s responsibility is to provide access to:

• Request data and host information and URI building
• Session access
• Project settings
• Response types (HTML and redirects)
• HTML rendering

Different frameworks implement these features on different ways, thus the need for these interfaces.

Implementing a new Strategy

The following methods must be defined on strategies sub-classes.

Request:

def request_data(self):
    """Return current request data (POST or GET)"""
    raise NotImplementedError('Implement in subclass')

def request_host(self):
    """Return current host value"""
    raise NotImplementedError('Implement in subclass')

def build_absolute_uri(self, path=None):
    """Build absolute URI with given (optional) path"""
    raise NotImplementedError('Implement in subclass')

Session:

def session_get(self, name):
    """Return session value for given key"""
    raise NotImplementedError('Implement in subclass')

def session_set(self, name, value):
    """Set session value for given key"""
    raise NotImplementedError('Implement in subclass')

def session_pop(self, name):
    """Pop session value for given key"""
    raise NotImplementedError('Implement in subclass')

Settings:

def get_setting(self, name):
    """Return value for given setting name"""
    raise NotImplementedError('Implement in subclass')

Responses:

def html(self, content):
    """Return HTTP response with given content"""
    raise NotImplementedError('Implement in subclass')

def redirect(self, url):
    """Return a response redirect to the given URL"""
    raise NotImplementedError('Implement in subclass')

def render_html(self, tpl=None, html=None, context=None):
    """Render given template or raw html with given context"""
    raise NotImplementedError('Implement in subclass')