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If you have ever used raw XML, then you are familiar with the fact that it lacks any data-type semantics; it cannot represent numbers, for example, but only elements that contain other elements, text strings, and text-string attributes. Thus the XML-RPC specification has to build additional semantics on top of the plain XML document format in order to specify how things like numbers should look when converted into marked-up text. The Python Standard Library makes it easy to write either an XML-RPC client or server, though more power is available when writing a client. For example, the client library supports HTTP basic authentication, while the server does not support this. Therefore, we will begin at the simple end, with the server. Listing 18 1 shows a basic server that starts a web server on port 7001 and listens for incoming Internet connections. Listing 18 1. An XML-RPC Server #!/usr/bin/env python # Foundations of Python Network Programming - 18 - xmlrpc_server.py # XML-RPC server import operator, math from SimpleXMLRPCServer import SimpleXMLRPCServer def addtogether(*things): """Add together everything in the list `things`.""" return reduce(operator.add, things) def quadratic(a, b, c): """Determine `x` values satisfying: `a` * x*x + `b` * x + c == 0""" b24ac = math.sqrt(b*b - 4.0*a*c) return list(set([ (-b-b24ac) / 2.0*a, (-b+b24ac) / 2.0*a ]))

Unit tests can be seen as a complement to the compiler and linker. These tools discover the apparent problems when constructing your software. The inner problems such as a nonfunctioning stack, a function miscalculating the results, and so on must be caught using

def remote_repr(arg): """Return the `repr()` rendering of the supplied `arg`.""" return arg server = SimpleXMLRPCServer(('127.0.0.1', 7001)) server.register_introspection_functions() server.register_multicall_functions() server.register_function(addtogether) server.register_function(quadratic) server.register_function(remote_repr) print "Server ready" server.serve_forever() An XML-RPC service lives at a single URL of a web site, so you do not have to actually dedicate an entire port to an RPC service like this; instead, you can integrate it with a normal web application that offers all sorts of other pages, or even entire other RPC services, at other URLs. But if you do have an entire port to spare, then the Python XML-RPC server offers an easy way to bring up a web server that does nothing but talk XML-RPC. You can see that the three sample functions that the server offers over XML-RPC the ones that are added to the RPC service through the register_function() calls are quite typical Python functions. And that, again, is the whole point of XML-RPC: it lets you make routines available for invocation over the network without having to write them any differently than if they were normal functions offered inside of your program.

beta testers, unit tests, or (beware!) actual users. By using unit tests, you can make sure that your beta testers focus on important issues and that your users will be less likely to find bugs in your software. The result will be a product of better quality.

Configuring setMapView After finding that the location of San Francisco is 33 degrees latitude by 84 degrees longitude, we now have the information we need to call the function.

The SimpleXMLRPCServer offered by the Standard Library is, as its name implies, quite simple; it cannot offer other web pages, it does not understand any kind of HTTP authentication, and you cannot ask it to offer TLS security without subclassing it yourself and adding more code But it will serve our purposes admirably, showing you some of the basic features and limits of RPC, while also letting you get up and running in only a few lines of code Note that two additional configuration calls are made in addition to the three calls that register our functions.

Qt comes with a lightweight unit testing module, the QtTest module (which might be expected because Qt encourages building components). When developing with this approach, it is important to be able to test each component individually.

Each of them turns on an additional service that is optional, but often provided by XML-RPC servers: an introspection routine that a client can use to ask which RPC calls are supported by a given server; and the ability to support a multicall function that lets several individual function calls be bundled together into a single network round-trip This server will need to be running before we can try any of the next three program listings, so bring up a command window and get it started: $ python xmlrpc_serverpy Server ready The server is now waiting for connections on localhost port 7001 All of the normal addressing rules apply to this TCP server that you learned in s 2 and 3, so you will have to connect to it from another command prompt on the same system.

With the QtTest module, each unit test is constructed from a class, which must inherit the QObject class and start with the Q_OBJECT macro A unit test consists of several test cases, and each test case is a private slot Four special slots are not treated as test cases: initTestCase: Initializes the unit test class and is called before the test cases are run cleanupTestCase: Cleans up the unit test and is called after all the tests cases have been run init: This method is run before each test case cleanup: This method is run after each test case All other slots are considered test cases and run accordingly The execution order, including the special slots listed previously, can be seen in Figure 16-1 The purpose of each test case is to test one or more aspects of a class.

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