client: switch SinkItem to Packet

this breaks backwards compatibility

src/client/mod.rs

@@ -1,6 +1,6 @@
 use futures::{done, Async, AsyncSink, Future, Poll, Sink, StartSend, Stream};
 use idna;
-use xmpp_parsers::{Jid, JidParseError, Element};
+use xmpp_parsers::{Jid, JidParseError};
 use sasl::common::{ChannelBinding, Credentials};
 use std::mem::replace;
 use std::str::FromStr;
@@ -193,24 +193,13 @@ impl Stream for Client {
 }
 
 impl Sink for Client {
-    type SinkItem = Element;
+    type SinkItem = Packet;
     type SinkError = Error;
 
     fn start_send(&mut self, item: Self::SinkItem) -> StartSend<Self::SinkItem, Self::SinkError> {
         match self.state {
-            ClientState::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!("Client.start_send with stanza but got something else back")
-                    }
-                    Ok(AsyncSink::Ready) =>
-                        Ok(AsyncSink::Ready),
-                    Err(e) =>
-                        Err(e)?,
-                }
-            }
+            ClientState::Connected(ref mut stream) =>
+                Ok(stream.start_send(item)?),
             _ =>
                 Ok(AsyncSink::NotReady(item)),
         }

src/lib.rs

@@ -8,6 +8,7 @@ extern crate derive_error;
 mod starttls;
 mod stream_start;
 pub mod xmpp_codec;
+pub use crate::xmpp_codec::Packet;
 pub mod xmpp_stream;
 pub use crate::starttls::StartTlsClient;
 mod event;