Twisted how many connections

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Question feed. Stack Overflow works best with JavaScript enabled. Keep track of how many are in progress, maintain a list with them in it. When a connection succeeds in connectionMade update the list to remember the connection's new state. When a connection completes in connectionLost tell the connection manager; its response should be to remove that connection and make a new connection somewhere else.

In the middle, it should be fairly obvious how to fire off a request for the names you need and stuff them into a database waiting for the database insert to complete before dropping your IRC connection, most likely, by waiting for the Deferred to come back from adbapi. Look here: Twisted Web in 60 seconds.

That's a group of blog posts describing step by step how to do lots of common stuff with Twisted, all written by Jean-Paul Calderone, the biggest contributor of Twisted.

It's really where you should start. After that, look at the Twisted core documentation then refer to the API and then into the source code.

It doesn't make any significant difference that the FAQ item is talking about many client connections to one server, as opposed to your question about one incoming client connection and one outgoing client connection.

The way you share data between different connections is the same. The essential take-away from that FAQ item is that basically anything you want to do involves a method call of some sort, and method calls in Twisted are the same as method calls in any other Python program. All you need is to have a reference to the right object to call the method on. So, for example, adapting your code:. I've taken the liberty of modernizing your Twisted code somewhat; endpoints instead of listenTCP , logger instead of twisted.

If we explicitly proxy the empty-child-segment path as if it did not have the trailing segment, I believe it will do what you expect. If your bytes transit over an actual network, you should ensure that they are properly encrypted with TLS. Managing multiple Twisted client connections. This is one of the simplest protocols.

It just writes whatever it reads from the connection to standard output. There are many events it does not respond to. Here is an example of a Protocol responding to another event:. This protocol connects to the server, sends it a welcome message, and then terminates the connection.

The connectionMade event is usually where set up of the Protocol object happens, as well as any initial greetings as in the WelcomeMessage protocol above. Any tearing down of Protocol -specific objects is done in connectionLost. In many cases, the protocol only needs to connect to the server once, and the code just wants to get a connected instance of the protocol.

In those cases twisted. Regardless of the type of client endpoint, the way to set up a new connection is simply pass it to connectProtocol along with a protocol instance. For more information on different ways you can make outgoing connections to different types of endpoints, as well as parsing strings into endpoints, see the documentation for the endpoints API. Rather than calling connect on an endpoint, such code will look like this:. In general, the endpoint API should be preferred in new code, as it lets the caller select the method of connecting.

To use the lower-level connection APIs, you will need to call one of the reactor. For these cases, you need a ClientFactory. The ClientFactory is in charge of creating the Protocol and also receives events relating to the connection state. This allows it to do things like reconnect in the event of a connection error.

Here is an example of a simple ClientFactory that uses the Echo protocol above and also prints what state the connection is in. To connect this EchoClientFactory to a server, you could use this code:. Note that clientConnectionFailed is called when a connection could not be established, and that clientConnectionLost is called when a connection was made and then disconnected.

The host argument it accepts can be either a hostname or an IP address literal. In the case of a hostname, the reactor will automatically resolve the name to an IP address before attempting the connection. This means that for a hostname with multiple address records, reconnection attempts may not always go to the same server see below. It also means that there is name resolution overhead for each connection attempt.

If you are creating many short-lived connections typically around hundreds or thousands per second then you may want to resolve the hostname to an address first and then pass the address to connectTCP instead.

Often, the connection of a client will be lost unintentionally due to network problems.