added an example of a web interface being added to a node

examples/webserver.tac

@@ -0,0 +1,59 @@
+from twisted.application import service, internet
+from twisted.python.log import ILogObserver
+from twisted.python import log
+from twisted.internet import reactor, task
+from twisted.web import resource, server
+from twisted.web.resource import NoResource
+
+import sys, os
+sys.path.append(os.path.dirname(__file__))
+from kademlia.network import Server
+from kademlia import log
+
+application = service.Application("kademlia")
+application.setComponent(ILogObserver, log.FileLogObserver(sys.stdout, log.INFO).emit)
+
+if os.path.isfile('cache.pickle'):
+    kserver = Server.loadState('cache.pickle')
+else:
+    kserver = Server()
+    kserver.bootstrap([("1.2.3.4", 8468)])
+kserver.saveStateRegularly('cache.pickle', 10)
+
+udpserver = internet.UDPServer(8468, kserver.protocol)
+udpserver.setServiceParent(application)
+
+class WebResource(resource.Resource):
+    def __init__(self, kserver):
+        resource.Resource.__init__(self)
+        self.kserver = kserver
+
+    def getChild(self, child, request):
+        return self
+
+    def render_GET(self, request):
+        def respond(value):
+            value = value or NoResource().render(request)
+            request.write(value)
+            request.finish()
+        log.msg("Getting key: %s" % request.path.split('/')[-1])
+        d = self.kserver.get(request.path.split('/')[-1])
+        d.addCallback(respond)
+        return server.NOT_DONE_YET
+
+    def render_POST(self, request):
+        key = request.path.split('/')[-1]
+        value = request.content.getvalue()
+        log.msg("Setting %s = %s" % (key, value))
+        self.kserver.set(key, value)
+        return value
+
+website = server.Site(WebResource(kserver))
+webserver = internet.TCPServer(8080, website)
+webserver.setServiceParent(application)
+
+
+# To test, you can set with:
+# $> curl --data "hi there" http://localhost:8080/one
+# and get with:
+# $> curl http://localhost:8080/one