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transforms values into properly wrapped dbus-python objects

Project description

Function

This library contains a function, make_class, that consumes an XML specification of a D-Bus interface.

>>> Klass = make_class("Klass", spec)

This call yields a Python class, called Klass, with two static class members, “Methods” and “Properties”. The “Methods” class has a static method corresponding to each method defined in the interface. Each method takes a proxy object as its first argument followed by any number of keyword arguments, corresponding to the arguments of the method. The “Properties” class has a static class corresponding to every property defined in the interface. Each property class may have a static Get() or Set() method, depending on its attributes.

For example, assuming the interface defines a read only Version property, the following call should return a value.

>>> Klass.Properties.Version.Get()

However, since Version is a read only property, the following call should fail with an AttributeError.

>>> Klass.Properties.Version.Set("42")

Similarly, if the interface defines a method, Create, with one argument, name, a STRING, the following call should succeed.

>>> Klass.Methods.Create(proxy, name="name")

The Create method invokes the method on the proxy object, passing force, transformed into a dbus-python String type.

On the other hand, the invocation will raise a DPClientError exception if the method is called with an argument with an incorrect type as,

>>> Klass.Methods.Create(proxy, name=false)

or with an incorrect keyword as,

>>> Klass.Methods.Create(proxy, force=false)

or without all the necessary keywords as,

>>> Klass.Methods.Create(proxy)

Errors

This library exports the exception type, DPClientError and all its subtypes. It constitutes a bug if an error of any other type is propagated during class generation or when the methods of the class are executed.

The following shows the error hierarchy. Entries after the dash indicate additional fields, beyond the message, which the exception contains. Only leaves of the error class heirarchy are constructed directly.

DPClientError

  • DPClientGenerationError This exception is raised if an error occurs while generating the method. Such an exception would result from introspection data which lacked the necessary attributes or entries.

  • DPClientRuntimeError - interface name This exception is raised if there is an error while the generated method is executing.

    • DPClientInvalidArgError This exception is raised if the arguments to be passed to the D-Bus method are incorrect.

      • DPClientKeywordError - method name, expected and actual keywords This exception is raised if there are missing or unexpected arguments.
      • DPClientMarshallingError - original arguments This exception is raised if the arguments can not be transformed to their required dbus-python types.
    • DPClientInvocationError - invocation context This exception is raised if a dbus-python method is invoked and some error occurs. This exception’s invocation context is used to distinguish between a method call, a get property call, and a set property call. The context is an object of type DPClientInvocationContext.

The DPClientInvocationContext hierarchy is shown below. Entries after the dash indicate the fields in the context.

DPClientInvocationContext

  • DPClientMethodCallContext - method name, arguments
  • DPClientGetPropertyContext - property name
  • DPClientSetPropertyContext - property name, value

Dependencies

  • dbus-python
  • into-dbus-python

Requirements

This library is not compatible with Python 2.

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