Update remaining examples for async.

examples/content_types/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
+futures-preview = "0.3.0-alpha.18"
 rocket = { path = "../../core/lib" }
 serde = "1.0"
 serde_json = "1.0"

examples/content_types/src/main.rs

@@ -5,10 +5,13 @@
 
 #[cfg(test)] mod tests;
 
-use std::io::{self, Read};
+use std::io;
+
+use futures::io::AsyncReadExt as _;
 
 use rocket::{Request, data::Data};
 use rocket::response::{Debug, content::{Json, Html}};
+use rocket::AsyncReadExt as _;
 
 // NOTE: This example explicitly uses the `Json` type from `response::content`
 // for demonstration purposes. In a real application, _always_ prefer to use
@@ -38,9 +41,10 @@ fn get_hello(name: String, age: u8) -> Json<String> {
 // In a real application, we wouldn't use `serde_json` directly; instead, we'd
 // use `contrib::Json` to automatically serialize a type into JSON.
 #[post("/<age>", format = "plain", data = "<name_data>")]
-fn post_hello(age: u8, name_data: Data) -> Result<Json<String>, Debug<io::Error>> {
+async fn post_hello(age: u8, name_data: Data) -> Result<Json<String>, Debug<io::Error>> {
     let mut name = String::with_capacity(32);
-    name_data.open().take(32).read_to_string(&mut name)?;
+    let mut stream = name_data.open().take(32);
+    stream.read_to_string(&mut name).await?;
     let person = Person { name: name, age: age, };
     // NOTE: In a real application, we'd use `rocket_contrib::json::Json`.
     Ok(Json(serde_json::to_string(&person).expect("valid JSON")))

examples/manual_routes/Cargo.toml

@@ -7,3 +7,5 @@ publish = false
 
 [dependencies]
 rocket = { path = "../../core/lib" }
+tokio = "0.2.0-alpha.2"
+futures-tokio-compat = { git = "https://github.com/Nemo157/futures-tokio-compat" }

examples/manual_routes/src/main.rs

@@ -3,66 +3,73 @@ extern crate rocket;
 #[cfg(test)]
 mod tests;
 
-use std::{io, env};
-use std::fs::File;
+use std::env;
+
+use futures_tokio_compat::Compat as TokioCompat;
+use tokio::fs::File;
 
 use rocket::{Request, Handler, Route, Data, Catcher, try_outcome};
 use rocket::http::{Status, RawStr};
 use rocket::response::{self, Responder, status::Custom};
-use rocket::handler::Outcome;
+use rocket::handler::{Outcome, HandlerFuture};
 use rocket::outcome::IntoOutcome;
 use rocket::http::Method::*;
 
-fn forward<'r>(_req: &'r Request, data: Data) -> Outcome<'r> {
-    Outcome::forward(data)
+fn forward<'r>(_req: &'r Request, data: Data) -> HandlerFuture<'r> {
+    Box::pin(async move { Outcome::forward(data) })
 }
 
-fn hi<'r>(req: &'r Request, _: Data) -> Outcome<'r> {
-    Outcome::from(req, "Hello!")
+fn hi<'r>(req: &'r Request, _: Data) -> HandlerFuture<'r> {
+    Box::pin(async move { Outcome::from(req, "Hello!").await })
 }
 
-fn name<'a>(req: &'a Request, _: Data) -> Outcome<'a> {
-    let param = req.get_param::<&'a RawStr>(0)
-        .and_then(|res| res.ok())
-        .unwrap_or("unnamed".into());
+fn name<'a>(req: &'a Request, _: Data) -> HandlerFuture<'a> {
+    Box::pin(async move {
+        let param = req.get_param::<&'a RawStr>(0)
+            .and_then(|res| res.ok())
+            .unwrap_or("unnamed".into());
 
-    Outcome::from(req, param.as_str())
+        Outcome::from(req, param.as_str()).await
+    })
 }
 
-fn echo_url<'r>(req: &'r Request, _: Data) -> Outcome<'r> {
-    let param_outcome = req.get_param::<&RawStr>(1)
-        .and_then(|res| res.ok())
-        .into_outcome(Status::BadRequest);
-
-    let param = try_outcome!(param_outcome);
-    Outcome::try_from(req, RawStr::from_str(param).url_decode())
+fn echo_url<'r>(req: &'r Request, _: Data) -> HandlerFuture<'r> {
+    Box::pin(async move {
+        let param_outcome = req.get_param::<&RawStr>(1)
+            .and_then(|res| res.ok())
+            .into_outcome(Status::BadRequest);
+        let param = try_outcome!(param_outcome);
+        Outcome::try_from(req, RawStr::from_str(param).url_decode()).await
+    })
 }
 
-fn upload<'r>(req: &'r Request, data: Data) -> Outcome<'r> {
-    if !req.content_type().map_or(false, |ct| ct.is_plain()) {
-        println!("    => Content-Type of upload must be text/plain. Ignoring.");
-        return Outcome::failure(Status::BadRequest);
-    }
-
-    let file = File::create(env::temp_dir().join("upload.txt"));
-    if let Ok(mut file) = file {
-        if let Ok(n) = io::copy(&mut data.open(), &mut file) {
-            return Outcome::from(req, format!("OK: {} bytes uploaded.", n));
+fn upload<'r>(req: &'r Request, data: Data) -> HandlerFuture<'r> {
+    Box::pin(async move {
+        if !req.content_type().map_or(false, |ct| ct.is_plain()) {
+            println!("    => Content-Type of upload must be text/plain. Ignoring.");
+            return Outcome::failure(Status::BadRequest);
         }
 
-        println!("    => Failed copying.");
-        Outcome::failure(Status::InternalServerError)
-    } else {
-        println!("    => Couldn't open file: {:?}", file.unwrap_err());
-        Outcome::failure(Status::InternalServerError)
-    }
+        let file = File::create(env::temp_dir().join("upload.txt")).await;
+        if let Ok(file) = file {
+            if let Ok(n) = data.stream_to(TokioCompat::new(file)).await {
+                return Outcome::from(req, format!("OK: {} bytes uploaded.", n)).await;
+            }
+
+            println!("    => Failed copying.");
+            Outcome::failure(Status::InternalServerError)
+        } else {
+            println!("    => Couldn't open file: {:?}", file.unwrap_err());
+            Outcome::failure(Status::InternalServerError)
+        }
+    })
 }
 
-fn get_upload<'r>(req: &'r Request, _: Data) -> Outcome<'r> {
-    Outcome::from(req, File::open(env::temp_dir().join("upload.txt")).ok())
+fn get_upload<'r>(req: &'r Request, _: Data) -> HandlerFuture<'r> {
+    Outcome::from(req, std::fs::File::open(env::temp_dir().join("upload.txt")).ok())
 }
 
-fn not_found_handler<'r>(req: &'r Request) -> response::Result<'r> {
+fn not_found_handler<'r>(req: &'r Request) -> response::ResultFuture<'r> {
     let res = Custom(Status::NotFound, format!("Couldn't find: {}", req.uri()));
     res.respond_to(req)
 }
@@ -79,13 +86,16 @@ impl CustomHandler {
 }
 
 impl Handler for CustomHandler {
-    fn handle<'r>(&self, req: &'r Request, data: Data) -> Outcome<'r> {
-        let id_outcome = req.get_param::<&RawStr>(0)
-            .and_then(|res| res.ok())
-            .or_forward(data);
+    fn handle<'r>(&self, req: &'r Request, data: Data) -> HandlerFuture<'r> {
+        let self_data = self.data;
+        Box::pin(async move {
+            let id_outcome = req.get_param::<&RawStr>(0)
+                .and_then(|res| res.ok())
+                .or_forward(data);
 
-        let id = try_outcome!(id_outcome);
-        Outcome::from(req, format!("{} - {}", self.data, id))
+            let id = try_outcome!(id_outcome);
+            Outcome::from(req, format!("{} - {}", self_data, id)).await
+        })
     }
 }
 

examples/manual_routes/src/tests.rs

@@ -30,8 +30,8 @@ fn test_echo() {
     test(&uri, ContentType::Plain, Status::Ok, "echo this text".into());
 }
 
-#[test]
-fn test_upload() {
+#[rocket::async_test]
+async fn test_upload() {
     let client = Client::new(rocket()).unwrap();
     let expected_body = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, \
                          sed do eiusmod tempor incididunt ut labore et dolore \

examples/pastebin/src/main.rs

@@ -7,7 +7,7 @@ mod paste_id;
 
 use std::io;
 use std::fs::File;
-use std::path::Path;
+use std::path::PathBuf;
 
 use rocket::Data;
 use rocket::response::{content, Debug};
@@ -18,12 +18,12 @@ const HOST: &str = "http://localhost:8000";
 const ID_LENGTH: usize = 3;
 
 #[post("/", data = "<paste>")]
-fn upload(paste: Data) -> Result<String, Debug<io::Error>> {
+async fn upload(paste: Data) -> Result<String, Debug<io::Error>> {
     let id = PasteID::new(ID_LENGTH);
     let filename = format!("upload/{id}", id = id);
     let url = format!("{host}/{id}\n", host = HOST, id = id);
 
-    paste.stream_to_file(Path::new(&filename))?;
+    paste.stream_to_file(PathBuf::from(filename)).await?;
     Ok(url)
 }
 

examples/raw_upload/src/main.rs

@@ -8,10 +8,8 @@ use std::{io, env};
 use rocket::{Data, response::Debug};
 
 #[post("/upload", format = "plain", data = "<data>")]
-fn upload(data: Data) -> Result<String, Debug<io::Error>> {
-    data.stream_to_file(env::temp_dir().join("upload.txt"))
-        .map(|n| n.to_string())
-        .map_err(Debug)
+async fn upload(data: Data) -> Result<String, Debug<io::Error>> {
+    Ok(data.stream_to_file(env::temp_dir().join("upload.txt")).await?.to_string())
 }
 
 #[get("/")]

examples/stream/Cargo.toml

@@ -7,3 +7,6 @@ publish = false
 
 [dependencies]
 rocket = { path = "../../core/lib" }
+futures-preview = "0.3.0-alpha.18"
+tokio = "0.2.0-alpha.2"
+futures-tokio-compat = { git = "https://github.com/Nemo157/futures-tokio-compat" }

examples/stream/src/main.rs

@@ -6,22 +6,27 @@
 
 use rocket::response::{content, Stream};
 
-use std::io::{repeat, Repeat, Read, Take};
-use std::fs::File;
+use std::io::repeat;
 
-type LimitedRepeat = Take<Repeat>;
+use tokio::fs::File;
+use futures_tokio_compat::Compat as TokioCompat;
+
+use rocket::AsyncReadExt as _;
+
+//type LimitedRepeat = Take<Repeat>;
+type LimitedRepeat = Box<dyn futures::io::AsyncRead + Send + Unpin>;
 
 // Generate this file using: head -c BYTES /dev/random > big_file.dat
 const FILENAME: &str = "big_file.dat";
 
 #[get("/")]
 fn root() -> content::Plain<Stream<LimitedRepeat>> {
-    content::Plain(Stream::from(repeat('a' as u8).take(25000)))
+    content::Plain(Stream::from(Box::new(repeat('a' as u8).take(25000)) as Box<_>))
 }
 
 #[get("/big_file")]
-fn file() -> Option<Stream<File>> {
-    File::open(FILENAME).map(|file| Stream::from(file)).ok()
+async fn file() -> Option<Stream<TokioCompat<File>>> {
+    File::open(FILENAME).await.map(|file| Stream::from(TokioCompat::new(file))).ok()
 }
 
 fn rocket() -> rocket::Rocket {