method_dispatcher.py

# HTTP view decorators inspired by property.setter
# See also a class-based solution in http://gist.github.com/85410

class MethodDispatcher(object):
    def __init__(self):
        self.views = {}
        
    def __call__(self, request, *args, **kwargs):
        m = request.method.upper()
        if m in self.views:
            return self.views[m](request, *args, **kwargs)
        if None in self.views:
            return self.views[None](request, *args, **kwargs)
        return HTTPNotAllowed()

    def methods(self, *ms):
        ms = [m.upper() for m in ms] if ms else [None]
        def decorator(func):
            for m in ms:
                self.views[m] = func
            return self
        return decorator

def http_methods(*methods):
    "A wrapper for building the method dispatcher object"
    def decorator(func):
        dispatcher = MethodDispatcher()
        dispatcher.methods(methods)
        return dispatcher
    return decorator

# An example

@http_methods("get", "post")
def index(request):
    # This view sees only requests whose methods are GET or POST

@index.methods("delete")
def index(request):
    # This view responds to DELETE

@index.methods()
def index(request):
    # Empty argument means that everything goes.