raising exceptions across DRb and XMLRPC

[Joe Van Dyk]

My architecture looks something like this. Please excuse the pitiful
ansi drawings.
(best viewed in fixed-width font)

------- -------
| GUI | | GUI |
------- -------
| |
| XMLRPC |
| |
| |
--------------------------
| NODE MANAGER |
--------------------------
| | |
| DRB |
| | |
| | |
------ ------ ------
|NODE| |NODE| |NODE|

I have GUIs that talk to a Node Manager that talks to Nodes.

Say, an error happens on a Node. How should I transmit that error
back across DRb and XMLRPC to the GUIs? Does XMLRPC do well with
exceptions? Should I come up with my own custom error-reporting
scheme?

Thanks,
Joe
------ ------ ------

 

[Florian Groß]

Say, an error happens on a Node. How should I transmit that error
back across DRb and XMLRPC to the GUIs? Does XMLRPC do well with
exceptions? Should I come up with my own custom error-reporting
scheme?

It is no problem with DRb as it can safely transport exceptions across
the network. No special casing is needed.

I'm not sure about XMLRPC.

 

[James Britt]

Joe Van Dyk wrote:
=20
=20
=20
It is no problem with DRb as it can safely transport exceptions across=20
the network. No special casing is needed.
=20
I'm not sure about XMLRPC.

Pretty sure XML-RPC has a defined means for expressing exceptions, or=20
faults:


http://www.xmlrpc.com/spec


James

--=20

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[Joe Van Dyk]

Pretty sure XML-RPC has a defined means for expressing exceptions, or
faults:


http://www.xmlrpc.com/spec

Hm, now all I have to do is figure out how to send a
XMLRPC::FaultException. Anyone have any example code?

 

[Adam Keys]

Hm, now all I have to do is figure out how to send a
XMLRPC::FaultException. Anyone have any example code?

IIRC, just raise it like any old exception

def my_xmlrpc_method
raise XMLRPC::FaultException.new(1, 'You got exception')
end

The first parameter is the fault code you want to send, the second is
the fault string.

HTH,

 

[Ezra Zygmuntowicz]

This is how I am using the XMLRPC::FaultException:

class BlogAPIFault < StandardError
end

def mt_getCategoryList(blogid)
result = @client.call('mt.getCategoryList', blogid, @username,
@password)
rescue XMLRPC::FaultException
raise BlogAPIFault.new($!.faultString)
end

This prints nice errors to stdout.

HTH-
-Ezra

IIRC, just raise it like any old exception

def my_xmlrpc_method
raise XMLRPC::FaultException.new(1, 'You got exception')
end

The first parameter is the fault code you want to send, the second
is the fault string.

HTH,

-Ezra Zygmuntowicz
Yakima Herald-Republic
WebMaster
http://yakimaherald.com
509-577-7732
(e-mail address removed)

 

[Joe Van Dyk]

Pretty sure XML-RPC has a defined means for expressing exceptions, or
faults:


http://www.xmlrpc.com/spec

Yes, so it does.

My ClusterManager class needs to throw Exceptions. The ClusterManager
class doesn't really know anything about XMLRPC, as it's being wrapped
by a ClusterManagerServer class that starts the xmlrpc server and adds
a ClusterManager object to the xmlrpc server's handler.

Should the ClusterManager class throw XMLRPC excepts? Or plain Ruby ones?