266 lines
9.6 KiB
Rust
266 lines
9.6 KiB
Rust
use futures::{sink::SinkExt, task::Poll, Future, Sink, Stream};
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use std::mem::replace;
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use std::pin::Pin;
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use std::task::Context;
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use tokio::task::JoinHandle;
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use xmpp_parsers::{ns, Element, Jid};
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use super::connect::client_login;
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use crate::connect::{AsyncReadAndWrite, ServerConnector};
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use crate::event::Event;
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use crate::stream_features::StreamFeatures;
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use crate::xmpp_codec::Packet;
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use crate::xmpp_stream::{add_stanza_id, XMPPStream};
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use crate::{Error, ProtocolError};
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/// XMPP client connection and state
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///
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/// It is able to reconnect. TODO: implement session management.
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///
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/// This implements the `futures` crate's [`Stream`](#impl-Stream) and
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/// [`Sink`](#impl-Sink<Packet>) traits.
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pub struct Client<C: ServerConnector> {
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config: Config<C>,
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state: ClientState<C::Stream>,
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reconnect: bool,
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// TODO: tls_required=true
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}
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/// XMPP client configuration
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#[derive(Clone, Debug)]
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pub struct Config<C> {
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/// jid of the account
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pub jid: Jid,
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/// password of the account
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pub password: String,
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/// server configuration for the account
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pub server: C,
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}
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enum ClientState<S: AsyncReadAndWrite> {
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Invalid,
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Disconnected,
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Connecting(JoinHandle<Result<XMPPStream<S>, Error>>),
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Connected(XMPPStream<S>),
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}
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impl<C: ServerConnector> Client<C> {
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/// Start a new client given that the JID is already parsed.
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pub fn new_with_config(config: Config<C>) -> Self {
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let connect = tokio::spawn(client_login(
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config.server.clone(),
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config.jid.clone(),
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config.password.clone(),
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));
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let client = Client {
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config,
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state: ClientState::Connecting(connect),
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reconnect: false,
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};
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client
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}
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/// Set whether to reconnect (`true`) or let the stream end
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/// (`false`) when a connection to the server has ended.
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pub fn set_reconnect(&mut self, reconnect: bool) -> &mut Self {
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self.reconnect = reconnect;
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self
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}
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/// Get the client's bound JID (the one reported by the XMPP
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/// server).
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pub fn bound_jid(&self) -> Option<&Jid> {
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match self.state {
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ClientState::Connected(ref stream) => Some(&stream.jid),
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_ => None,
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}
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}
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/// Send stanza
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pub async fn send_stanza(&mut self, stanza: Element) -> Result<(), Error> {
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self.send(Packet::Stanza(add_stanza_id(stanza, ns::JABBER_CLIENT)))
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.await
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}
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/// Get the stream features (`<stream:features/>`) of the underlying stream
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pub fn get_stream_features(&self) -> Option<&StreamFeatures> {
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match self.state {
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ClientState::Connected(ref stream) => Some(&stream.stream_features),
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_ => None,
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}
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}
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/// End connection by sending `</stream:stream>`
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///
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/// You may expect the server to respond with the same. This
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/// client will then drop its connection.
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///
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/// Make sure to disable reconnect.
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pub async fn send_end(&mut self) -> Result<(), Error> {
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self.send(Packet::StreamEnd).await
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}
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}
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/// Incoming XMPP events
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///
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/// In an `async fn` you may want to use this with `use
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/// futures::stream::StreamExt;`
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impl<C: ServerConnector> Stream for Client<C> {
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type Item = Event;
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/// Low-level read on the XMPP stream, allowing the underlying
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/// machinery to:
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///
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/// * connect,
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/// * starttls,
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/// * authenticate,
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/// * bind a session, and finally
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/// * receive stanzas
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///
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/// ...for your client
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fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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let state = replace(&mut self.state, ClientState::Invalid);
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match state {
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ClientState::Invalid => panic!("Invalid client state"),
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ClientState::Disconnected if self.reconnect => {
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// TODO: add timeout
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let connect = tokio::spawn(client_login(
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self.config.server.clone(),
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self.config.jid.clone(),
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self.config.password.clone(),
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));
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self.state = ClientState::Connecting(connect);
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self.poll_next(cx)
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}
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ClientState::Disconnected => {
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self.state = ClientState::Disconnected;
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Poll::Pending
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}
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ClientState::Connecting(mut connect) => match Pin::new(&mut connect).poll(cx) {
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Poll::Ready(Ok(Ok(stream))) => {
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let bound_jid = stream.jid.clone();
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self.state = ClientState::Connected(stream);
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Poll::Ready(Some(Event::Online {
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bound_jid,
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resumed: false,
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}))
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}
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Poll::Ready(Ok(Err(e))) => {
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(e.into())));
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}
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Poll::Ready(Err(e)) => {
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self.state = ClientState::Disconnected;
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panic!("connect task: {}", e);
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}
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Poll::Pending => {
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self.state = ClientState::Connecting(connect);
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Poll::Pending
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}
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},
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ClientState::Connected(mut stream) => {
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// Poll sink
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match Pin::new(&mut stream).poll_ready(cx) {
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Poll::Pending => (),
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Poll::Ready(Ok(())) => (),
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Poll::Ready(Err(e)) => {
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(e.into())));
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}
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};
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// Poll stream
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//
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// This needs to be a loop in order to ignore packets we don’t care about, or those
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// we want to handle elsewhere. Returning something isn’t correct in those two
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// cases because it would signal to tokio that the XMPPStream is also done, while
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// there could be additional packets waiting for us.
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//
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// The proper solution is thus a loop which we exit once we have something to
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// return.
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loop {
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match Pin::new(&mut stream).poll_next(cx) {
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Poll::Ready(None) => {
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// EOF
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(Error::Disconnected)));
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}
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Poll::Ready(Some(Ok(Packet::Stanza(stanza)))) => {
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// Receive stanza
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self.state = ClientState::Connected(stream);
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return Poll::Ready(Some(Event::Stanza(stanza)));
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}
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Poll::Ready(Some(Ok(Packet::Text(_)))) => {
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// Ignore text between stanzas
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}
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Poll::Ready(Some(Ok(Packet::StreamStart(_)))) => {
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// <stream:stream>
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(
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ProtocolError::InvalidStreamStart.into(),
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)));
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}
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Poll::Ready(Some(Ok(Packet::StreamEnd))) => {
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// End of stream: </stream:stream>
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(Error::Disconnected)));
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}
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Poll::Pending => {
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// Try again later
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self.state = ClientState::Connected(stream);
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return Poll::Pending;
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}
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Poll::Ready(Some(Err(e))) => {
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self.state = ClientState::Disconnected;
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return Poll::Ready(Some(Event::Disconnected(e.into())));
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}
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}
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}
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}
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}
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}
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}
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/// Outgoing XMPP packets
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///
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/// See `send_stanza()` for an `async fn`
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impl<C: ServerConnector> Sink<Packet> for Client<C> {
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type Error = Error;
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fn start_send(mut self: Pin<&mut Self>, item: Packet) -> Result<(), Self::Error> {
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match self.state {
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ClientState::Connected(ref mut stream) => {
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Pin::new(stream).start_send(item).map_err(|e| e.into())
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}
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_ => Err(Error::InvalidState),
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}
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}
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fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
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match self.state {
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ClientState::Connected(ref mut stream) => {
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Pin::new(stream).poll_ready(cx).map_err(|e| e.into())
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}
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_ => Poll::Pending,
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}
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}
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fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
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match self.state {
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ClientState::Connected(ref mut stream) => {
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Pin::new(stream).poll_flush(cx).map_err(|e| e.into())
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}
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_ => Poll::Pending,
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}
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}
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fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
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match self.state {
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ClientState::Connected(ref mut stream) => {
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Pin::new(stream).poll_close(cx).map_err(|e| e.into())
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}
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_ => Poll::Pending,
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}
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}
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}
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