codec: change Encoder to take &Item (#1746)

Co-authored-by: Markus Westerlind <[email protected]>

examples/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 
 [dev-dependencies]
 tokio = { version = "0.2.0", path = "../tokio", features = ["full"] }
-tokio-util = { version = "0.2.0", path = "../tokio-util", features = ["full"] }
+tokio-util = { version = "0.3.0", path = "../tokio-util", features = ["full"] }
 bytes = "0.5"
 futures = "0.3.0"
 http = "0.2"

examples/chat.rs

@@ -193,9 +193,7 @@ async fn process(
     let mut lines = Framed::new(stream, LinesCodec::new());
 
     // Send a prompt to the client to enter their username.
-    lines
-        .send(String::from("Please enter your username:"))
-        .await?;
+    lines.send("Please enter your username:").await?;
 
     // Read the first line from the `LineCodec` stream to get the username.
     let username = match lines.next().await {
@@ -232,7 +230,7 @@ async fn process(
             // A message was received from a peer. Send it to the
             // current user.
             Ok(Message::Received(msg)) => {
-                peer.lines.send(msg).await?;
+                peer.lines.send(&msg).await?;
             }
             Err(e) => {
                 println!(

examples/tinydb.rs

@@ -130,7 +130,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
                                 let response = response.serialize();
 
-                                if let Err(e) = lines.send(response).await {
+                                if let Err(e) = lines.send(response.as_str()).await {
                                     println!("error on sending response; error = {:?}", e);
                                 }
                             }

examples/tinyhttp.rs

@@ -96,8 +96,7 @@ struct Http;
 
 /// Implementation of encoding an HTTP response into a `BytesMut`, basically
 /// just writing out an HTTP/1.1 response.
-impl Encoder for Http {
-    type Item = Response<String>;
+impl Encoder<Response<String>> for Http {
     type Error = io::Error;
 
     fn encode(&mut self, item: Response<String>, dst: &mut BytesMut) -> io::Result<()> {