lib: add a component connection method

src/component/mod.rs

@@ -0,0 +1,154 @@
+use std::mem::replace;
+use std::str::FromStr;
+use std::error::Error;
+use tokio_core::reactor::Handle;
+use tokio_core::net::TcpStream;
+use tokio_io::{AsyncRead, AsyncWrite};
+use futures::{Future, Stream, Poll, Async, Sink, StartSend, AsyncSink};
+use minidom::Element;
+use jid::{Jid, JidParseError};
+
+use super::xmpp_codec::Packet;
+use super::xmpp_stream;
+use super::happy_eyeballs::Connecter;
+
+mod auth;
+use self::auth::ComponentAuth;
+mod event;
+pub use self::event::Event as ComponentEvent;
+
+pub struct Component {
+    pub jid: Jid,
+    state: ComponentState,
+}
+
+type XMPPStream = xmpp_stream::XMPPStream<TcpStream>;
+const NS_JABBER_COMPONENT_ACCEPT: &str = "jabber:component:accept";
+
+enum ComponentState {
+    Invalid,
+    Disconnected,
+    Connecting(Box<Future<Item=XMPPStream, Error=String>>),
+    Connected(XMPPStream),
+}
+
+impl Component {
+    pub fn new(jid: &str, password: &str, server: &str, port: u16, handle: Handle) -> Result<Self, JidParseError> {
+        let jid = try!(Jid::from_str(jid));
+        let password = password.to_owned();
+        let connect = Self::make_connect(jid.clone(), password, server, port, handle);
+        Ok(Component {
+            jid,
+            state: ComponentState::Connecting(connect),
+        })
+    }
+
+    fn make_connect(jid: Jid, password: String, server: &str, port: u16, handle: Handle) -> Box<Future<Item=XMPPStream, Error=String>> {
+        let jid1 = jid.clone();
+        let password = password;
+        Box::new(
+            Connecter::from_lookup(handle, server, "_xmpp-component._tcp", port)
+                .expect("Connector::from_lookup")
+                .and_then(move |tcp_stream| {
+                    xmpp_stream::XMPPStream::start(tcp_stream, jid1, NS_JABBER_COMPONENT_ACCEPT.to_owned())
+                    .map_err(|e| format!("{}", e))
+                }).and_then(move |xmpp_stream| {
+                    Self::auth(xmpp_stream, password).expect("auth")
+                }).and_then(|xmpp_stream| {
+                    println!("Bound to {}", xmpp_stream.jid);
+                    Ok(xmpp_stream)
+                })
+        )
+    }
+
+    fn auth<S: AsyncRead + AsyncWrite>(stream: xmpp_stream::XMPPStream<S>, password: String) -> Result<ComponentAuth<S>, String> {
+        ComponentAuth::new(stream, password)
+    }
+}
+
+impl Stream for Component {
+    type Item = ComponentEvent;
+    type Error = String;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        let state = replace(&mut self.state, ComponentState::Invalid);
+
+        match state {
+            ComponentState::Invalid =>
+                Err("invalid client state".to_owned()),
+            ComponentState::Disconnected =>
+                Ok(Async::Ready(None)),
+            ComponentState::Connecting(mut connect) => {
+                match connect.poll() {
+                    Ok(Async::Ready(stream)) => {
+                        self.state = ComponentState::Connected(stream);
+                        Ok(Async::Ready(Some(ComponentEvent::Online)))
+                    },
+                    Ok(Async::NotReady) => {
+                        self.state = ComponentState::Connecting(connect);
+                        Ok(Async::NotReady)
+                    },
+                    Err(e) =>
+                        Err(e),
+                }
+            },
+            ComponentState::Connected(mut stream) => {
+                match stream.poll() {
+                    Ok(Async::NotReady) => {
+                        self.state = ComponentState::Connected(stream);
+                        Ok(Async::NotReady)
+                    },
+                    Ok(Async::Ready(None)) => {
+                        // EOF
+                        self.state = ComponentState::Disconnected;
+                        Ok(Async::Ready(Some(ComponentEvent::Disconnected)))
+                    },
+                    Ok(Async::Ready(Some(Packet::Stanza(stanza)))) => {
+                        self.state = ComponentState::Connected(stream);
+                        Ok(Async::Ready(Some(ComponentEvent::Stanza(stanza))))
+                    },
+                    Ok(Async::Ready(_)) => {
+                        self.state = ComponentState::Connected(stream);
+                        Ok(Async::NotReady)
+                    },
+                    Err(e) =>
+                        Err(e.description().to_owned()),
+                }
+            },
+        }
+    }
+}
+
+impl Sink for Component {
+    type SinkItem = Element;
+    type SinkError = String;
+
+    fn start_send(&mut self, item: Self::SinkItem) -> StartSend<Self::SinkItem, Self::SinkError> {
+        match self.state {
+            ComponentState::Connected(ref mut stream) =>
+                match stream.start_send(Packet::Stanza(item)) {
+                    Ok(AsyncSink::NotReady(Packet::Stanza(stanza))) =>
+                        Ok(AsyncSink::NotReady(stanza)),
+                    Ok(AsyncSink::NotReady(_)) =>
+                        panic!("Component.start_send with stanza but got something else back"),
+                    Ok(AsyncSink::Ready) => {
+                        Ok(AsyncSink::Ready)
+                    },
+                    Err(e) =>
+                        Err(e.description().to_owned()),
+                },
+            _ =>
+                Ok(AsyncSink::NotReady(item)),
+        }
+    }
+
+    fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
+        match &mut self.state {
+            &mut ComponentState::Connected(ref mut stream) =>
+                stream.poll_complete()
+                .map_err(|e| e.description().to_owned()),
+            _ =>
+                Ok(Async::Ready(())),
+        }
+    }
+}