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echo_bot: illustrate close()

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This commit is contained in:
Astro 2019-01-26 23:59:06 +01:00
parent 6379f91e02
commit 234450b9d1
1 changed files with 30 additions and 16 deletions
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46
examples/echo_bot.rs
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@ -1,4 +1,4 @@
use futures::{future, Sink, Stream};
use futures::{future, Future, Sink, Stream};
use std::env::args;
use std::process::exit;
use tokio::runtime::current_thread::Runtime;
@ -23,36 +23,50 @@ fn main() {
// Make the two interfaces for sending and receiving independent
// of each other so we can move one into a closure.
let (mut sink, stream) = client.split();
// Wrap sink in Option so that we can take() it for the send(self)
// to consume and return it back when ready.
let mut send = move |stanza| {
sink.start_send(stanza).expect("start_send");
};
let (sink, stream) = client.split();
let mut sink_state = Some(sink);
// Main loop, processes events
let done = stream.for_each(|event| {
let done = stream.for_each(move |event| {
let mut sink_future = None;
if event.is_online() {
println!("Online!");
let presence = make_presence();
send(presence);
let sink = sink_state.take().unwrap();
sink_future = Some(Box::new(sink.send(presence)));
} else if let Some(message) = event
.into_stanza()
.and_then(|stanza| Message::try_from(stanza).ok())
{
// This is a message we'll echo
match (message.from, message.bodies.get("")) {
(Some(from), Some(body)) => {
(Some(ref from), Some(ref body)) if body.0 == "die" => {
println!("Secret die command triggered by {}", from);
let sink = sink_state.as_mut().unwrap();
sink.close().expect("close");
}
(Some(ref from), Some(ref body)) => {
if message.type_ != MessageType::Error {
let reply = make_reply(from, &body.0);
send(reply);
// This is a message we'll echo
let reply = make_reply(from.clone(), &body.0);
let sink = sink_state.take().unwrap();
sink_future = Some(Box::new(sink.send(reply)));
}
}
_ => (),
}
_ => {}
}
};
Box::new(future::ok(()))
sink_future
.map(|future| {
let wait_send: Box<Future<Item = (), Error = tokio_xmpp::Error>> =
Box::new(future
.map(|sink| {
sink_state = Some(sink);
}));
wait_send
})
.unwrap_or_else(|| Box::new(future::ok(())))
});
// Start polling `done`