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CHAPTER 27 ■ PROJECT 8: FILE SHARING WITH XML-RPC 515 def __init__(self, url, dirname, urlfile): """ Sets the url, dirname, and urlfile, and starts the Node Server in a separate thread. """ Cmd.__init__(self) self.secret = randomString(SECRET_LENGTH) n = Node(url, dirname, self.secret) t = Thread(target=n._start) t.setDaemon(1) t.start() # Give the server a head start: sleep(HEAD_START) self.server = ServerProxy(url) for line in open(urlfile): line = line.strip() self.server.hello(line) def do_fetch(self, arg): "Call the fetch method of the Server." try: self.server.fetch(arg, self.secret) except Fault, f: if f.faultCode != UNHANDLED: raise print "Couldn't find the file", arg def do_exit(self, arg): "Exit the program." print sys.exit() do_EOF = do_exit # End-Of-File is synonymous with 'exit' def main(): urlfile, directory, url = sys.argv[1:] client = Client(url, directory, urlfile) client.cmdloop() if __name__ == '__main__': main()
516 CHAPTER 27 ■ PROJECT 8: FILE SHARING WITH XML-RPC Further Exploration You can probably think of several ways to improve and extend the system described in this chapter, but here are some ideas: • Add caching: If you node relays a file through a call to query, why not store the file at the same time? That way you can respond more quickly the next time someone asks for the same file. You could perhaps set a maximum size for the cache, remove old files, and so on. • Use a threaded or asynchronous server (a bit difficult). That way you can ask several other nodes for help without waiting for their replies, and they can later give you the reply by calling a reply method. • Allow more advanced queries, such as querying on the contents of text files. • Use the hello method more extensively. When you discover a new peer (through a call to hello), why not introduce it to all the peers you know? Perhaps you can think of more clever ways of discovering new peers? • Read up on the REST philosophy of distributed systems—an emerging alternative to Web service technologies such as XML-RPC. (See, for example, http://en.wikipedia.org/ wiki/REST.) • Use xmlrpclib.Binary to wrap the files, to make the transfer safer for nontext files. • Read the SimpleXMLRPCServer code. Check out the DocXMLRPCServer class and the multicall extension in libxmlrpc. What Now? Now that you have a peer-to-peer file sharing system working, how about making it more user-friendly? In the next chapter, you learn how to add a GUI as an alternative to the current cmd-based interface.
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Beginning Python From Novice to Pro
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256 CHAPTER 11 ■ FILES AND STUFF
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Index ■Symbols - operator 558 !=
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