Beginning Python - From Novice to Professional

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CHAPTER 28 ■ PROJECT 9: FILE SHARING II—NOW WITH GUI! 521 def main(): urlfile, directory, url = sys.argv[1:] client = Client(url, directory, urlfile) client.MainLoop() if __name__ == "__main__": main() To run this program, you need a URL file, a directory of files to share, and a URL for your Node. Here is a sample run: $ python simple_guiclient.py urlfile.txt files/ http://localhost:8080 Note that the file urlfile.txt must contain the URLs of some other Nodes for the program to be of any use. You can either start several programs on the same machine (with different port numbers) for testing purposes, or run them on different machines. See Figure 28-1 for a screenshot of the client. Figure 28-1. The simple GUI client Second Implementation The first prototype was very simple. It did its job as a file sharing system, but wasn’t very userfriendly. It would help a lot if the user could see which files he or she had available (either located in the file directory when the program starts, or subsequently downloaded from another Node). The second implementation will address this file listing issue. The full source code can be found in Listing 28-2 later in this section. To get a listing from a Node, you must add a method. You could protect it with a password like you have done with fetch, but making it publicly available may be useful, and it doesn’t represent any real security risk. Extending an object is really easy: you can do it through subclassing. You simply construct a subclass of Node called ListableNode, with a single additional method, list, which uses the method os.listdir, which returns a list of all the files in a directory: class ListableNode(Node): def list(self): return listdir(self.dirname) To access this server method, the method updateList is added to the client: def updateList(self): self.files.Set(self.server.list())
522 CHAPTER 28 ■ PROJECT 9: FILE SHARING II—NOW WITH GUI! The attribute self.files refers to a list box, which has been added in the OnInit method. The updateList method is called in OnInit at the point where the list box is created, and again each time fetchHandler is called (because calling fetchHandler may potentially alter the list of files). And that’s it. You now have a GUI-enabled peer-to-peer file sharing program, which can be run with the command $ python guiclient.py urlfile.txt files/ http://localhost:8080 To see what it looks like, see Figure 28-2. The full source code is found in Listing 28-2. Figure 28-2. The finished GUI client Of course, there are plenty of ways to expand the program. For some ideas, see the next section, “Further Exploration,” as well as the section with the same title in Chapter 27. Beyond that, just let your imagination go wild. Listing 28-2. The Finished GUI Client (guiclient.py) from xmlrpclib import ServerProxy, Fault from server import Node, UNHANDLED from client import randomString from threading import Thread from time import sleep from os import listdir import sys import wx HEAD_START = 0.1 # Seconds SECRET_LENGTH = 100
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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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