Function require

ddserver/utils/deps.py:109–134

Decorator to inject requirements into a function. The decorated function is called with a named argument for each specified requirement containing the exported instances.

(**requirements)

def require(**requirements):
  ''' Decorator to inject requirements into a function.

      The decorated function is called with a named argument for each
      specified requirement containing the exported instances.
  '''

  exports = {name : Export.load(requirement)
             for name, requirement
             in requirements.iteritems()}

  def wrapper(func):
    def wrapped(*args, **kwargs):
      # Update the keyword arguments with the required instances
      kwargs.update({name : export.instance
                     for name, export
                     in exports.iteritems()
                     if name not in kwargs})

      return func(*args,
                  **kwargs)

    wrapped.__name__ = func.__name__

    return wrapped
  return wrapper