xmlstream: implement simple timeout logic

This allows to detect and handle dying streams without getting stuck
forever.

Timeouts are always wrong, though, so we put the burden of choosing the
right values (mostly) on the creator of a stream.

tokio-xmpp/src/connect/tcp.rs

@@ -6,7 +6,7 @@ use tokio::{io::BufStream, net::TcpStream};
 
 use crate::{
     connect::{DnsConfig, ServerConnector},
-    xmlstream::{initiate_stream, PendingFeaturesRecv, StreamHeader},
+    xmlstream::{initiate_stream, PendingFeaturesRecv, StreamHeader, Timeouts},
     Client, Component, Error,
 };
 
@@ -35,6 +35,7 @@ impl ServerConnector for TcpServerConnector {
         &self,
         jid: &xmpp_parsers::jid::Jid,
         ns: &'static str,
+        timeouts: Timeouts,
     ) -> Result<PendingFeaturesRecv<Self::Stream>, Error> {
         let stream = BufStream::new(self.0.resolve().await?);
         Ok(initiate_stream(
@@ -45,6 +46,7 @@ impl ServerConnector for TcpServerConnector {
                 from: None,
                 id: None,
             },
+            timeouts,
         )
         .await?)
     }