[Twisted-Python] Sending a "good-bye message" before closing a connection
Hi! We have a small heartbeat-system based on Twisted. The clients register at the server and send some health information in regular intervals. If the server does not get a lifesign from a client, this is registered in a database. But sometimes, the clients have to go offline. In this case, I'd like them to send a message to the server that they will be gone for a while. When a client goes offline, the twistd daemon for handling the heartbeats is shut down. What is the best way to do this in Twisted? The `clientConnectionLost` method of the factory is only called after disconnecting, AFAICT. Thanks & best regards, -- Albert Brandl A-4813 Altmünster - Abteistraße 12 - web: www.weiermayer.com - phone: +43761287677 - fax: +43761220356 - mobile: +436642442777
On Fri, 2011-11-18 at 12:23 +0100, Albert Brandl wrote:
But sometimes, the clients have to go offline. In this case, I'd like them to send a message to the server that they will be gone for a while. When a client goes offline, the twistd daemon for handling the heartbeats is shut down.
Presumably there is a method somewhere that decides to close the connection down: def timeToShutdown(self): self.transport.loseConnection() So instead do: def timeToShutdown(self): self.transport.write(GOODBYE) self.transport.loseConnection()
Hi! On Fri, Nov 18, 2011 at 08:31:18AM -0500, Itamar Turner-Trauring wrote:
Presumably there is a method somewhere that decides to close the connection down:
def timeToShutdown(self): self.transport.loseConnection()
Actually, I hoped that I'd find such a method in the framework. When the twistd daemon is shut down, it has to close all connections, and it would have been nice if there were a hook that could be overridden. But AFAICT, the respective code is buried inside the BaseConnector class, and I'd rather leave it alone :-). Anyway - it should be possible to send some kind of message to the daemon in the init script before shutting it down. Thanks & best regards, -- Albert Brandl | Weiermayer Solutions GmbH A-4813 Altmünster - Abteistraße 12 - web: www.weiermayer.com - phone: +43761287677 - fax: +43761220356 - mobile: +436642442777
On 10:13 am, albert.brandl@weiermayer.com wrote:
Hi!
On Fri, Nov 18, 2011 at 08:31:18AM -0500, Itamar Turner-Trauring wrote:
Presumably there is a method somewhere that decides to close the connection down:
def timeToShutdown(self): self.transport.loseConnection()
Actually, I hoped that I'd find such a method in the framework. When the twistd daemon is shut down, it has to close all connections, and it would have been nice if there were a hook that could be overridden.
But AFAICT, the respective code is buried inside the BaseConnector class, and I'd rather leave it alone :-).
Anyway - it should be possible to send some kind of message to the daemon in the init script before shutting it down.
The shutdown hook provided is IService.stopService. You can add your custom shutdown logic there, and attach your service to the Application/Service hierarchy. Jean-Paul
participants (3)
-
Albert Brandl -
exarkun＠twistedmatrix.com -
Itamar Turner-Trauring