User Defined Types
User Defined Types
The
url = "http://localhost:8000/service/validator" service = netrpc.RemoteService(url,"admin","secret")
#following are equivalent value = complex(1,1) print service.echo(value)
print service.echo(netrpc.Opaque("python:complex",repr(value)))
Encoders and decoders for additional user defined scalar types can be provided by registering the ap- propriate functions using the "encoder()" and "decoder()" functions available in the "netrpc" module. The functions for registering the encoder and decoder functions are used in exactly the same was as those in the "netsvc" module. In fact, they are the same functions as the "netsvc" module imports them from the "netrpc" module, as it does for the implementations of all of the extended types.
As is the case in the service agent framework, you need to be mindful about the effect of registering arbitrary encoders and decoders at global scope, especially if your client application makes calls against different services implementing their own scalar types. This becomes even more of an issue if the "netrpc" module is used to make client side calls from inside a server side application using the "netsvc" module. This is because they will share the same global encoders and decoders.
If you need to support types which are specific to a service being called, rather than registering the en- coder and decoder function at global scope, the safer way is to supply your own functions just for that service. This is done by supplying the function using a keyword argument when initialising the in- stance of the RemoteService class. The keyword argument for the encoder function is "encode" and that for the decoder function is "decode". The functions you supply should call the corresponding global function if it doesn’t know what to do with a specific type.
def encodeObject(object):
if type(object) == MySQLdb.DateTimeType: return ("xsd:string",object.strftime())
elif type(object) == MySQLdb.DateTimeDeltaType: return ("xsd:string",str(object))
return netsvc.encodeObject(object)
url = "http://localhost:8000/service/validator"
service = netrpc.RemoteService(url,encode=encodeObject)
