Start of file caching decorator for brubeck

caching.py

###
### filecache decorator for static storage of rendered templates
###

def filecache(expires=60):
    # Set time in seconds to keep file around. 
    # Default is 60 (1 min).
    def decorator(method):
        @functools.wraps(method)
        def wrapper(self, *args, **kwargs):
            m = md5.new()
            m.update(self.message.path)
            filename = "tmp/%s" % (m.hexdigest())
            if not(os.path.exists(filename)):
                # Doesn't exist - create cached file with response.
                response = method(self, *args, **kwargs)
                f = open(filename, "w")
                f.write(response)
                f.close()
            else:
                age = time.time() - os.path.getmtime(filename)
                if(age >= expires):
                    # Too old - update cached file with response.
                    response = method(self, *args, **kwargs)
                    f = open(filename, "w")
                    f.write(response)
                    f.close()
                else:
                    # Return file contents as response.
                    print("using cache")
                    f = open(filename, "r")
                    response = f.read()
                    f.close()
            return response
        return wrapper
    return decorator