1 files changed, 56 insertions, 0 deletions
diff --git a/doc/core/howto/tutorial/listings/finger/finger14.tac b/doc/core/howto/tutorial/listings/finger/finger14.tac
new file mode 100755
index 0000000..48e4ee0
--- /dev/null
+++ b/doc/core/howto/tutorial/listings/finger/finger14.tac
@@ -0,0 +1,56 @@
+# Read from file
+from twisted.application import internet, service
+from twisted.internet import protocol, reactor, defer
+from twisted.protocols import basic
+
+class FingerProtocol(basic.LineReceiver):
+    def lineReceived(self, user):
+        d = self.factory.getUser(user)
+
+        def onError(err):
+            return 'Internal error in server'
+        d.addErrback(onError)
+
+        def writeResponse(message):
+            self.transport.write(message + '\r\n')
+            self.transport.loseConnection()
+        d.addCallback(writeResponse)
+
+
+class FingerService(service.Service):
+    def __init__(self, filename):
+        self.users = {}
+        self.filename = filename
+
+    def _read(self):
+        for line in file(self.filename):
+            user, status = line.split(':', 1)
+            user = user.strip()
+            status = status.strip()
+            self.users[user] = status
+        self.call = reactor.callLater(30, self._read)
+
+    def startService(self):
+        self._read()
+        service.Service.startService(self)
+
+    def stopService(self):
+        service.Service.stopService(self)
+        self.call.cancel()
+
+    def getUser(self, user):
+        return defer.succeed(self.users.get(user, "No such user"))
+
+    def getFingerFactory(self):
+        f = protocol.ServerFactory()
+        f.protocol = FingerProtocol
+        f.getUser = self.getUser
+        return f
+
+
+application = service.Application('finger', uid=1, gid=1)
+f = FingerService('/etc/users')
+finger = internet.TCPServer(79, f.getFingerFactory())
+
+finger.setServiceParent(service.IServiceCollection(application))
+f.setServiceParent(service.IServiceCollection(application))