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updated async_ex1, removing old Box example and fixing example

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This commit is contained in:
dowwie 2019-04-09 10:36:37 -04:00
parent 4bec1ede67
commit 4b62438e05
2 changed files with 14 additions and 70 deletions
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3
async_ex1/README.md
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@ -16,5 +16,4 @@ Actix-web features illustrated here include:
Example query from the command line using httpie: Example query from the command line using httpie:
```http post 127.0.0.1:8088/something id=1 name=JohnDoe``` ```echo '{"id":"1", "name": "JohnDoe"}' | http 127.0.0.1:8080/something```

81
async_ex1/src/main.rs
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@ -11,9 +11,7 @@
// 2. actix-web client features: // 2. actix-web client features:
// - POSTing json body // - POSTing json body
// 3. chaining futures into a single response used by an asynch endpoint // 3. chaining futures into a single response used by an asynch endpoint
//
// There are 2 versions in this example, one that uses Boxed Futures and the
// other that uses Impl Future, available since rustc v1.26.
#[macro_use] #[macro_use]
extern crate validator_derive; extern crate validator_derive;
@ -49,60 +47,10 @@ struct HttpBinResponse {
url: String, url: String,
} }
// -----------------------------------------------------------------------
// v1 uses Boxed Futures, which were the only option prior to rustc v1.26
// -----------------------------------------------------------------------
/// post json to httpbin, get it back in the response body, return deserialized /// post json to httpbin, get it back in the response body, return deserialized
fn step_x_v1( fn step_x(
data: SomeData,
client: &Client,
) -> Box<Future<Item = SomeData, Error = Error>> {
Box::new(
client
.post("https://httpbin.org/post")
.send_json(&data)
.map_err(Error::from) // <- convert SendRequestError to an Error
.and_then(|resp| {
resp // <- this is MessageBody type, resolves to complete body
.from_err() // <- convert PayloadError to an Error
.fold(BytesMut::new(), |mut acc, chunk| {
acc.extend_from_slice(&chunk);
Ok::<_, Error>(acc)
})
.map(|body| {
let body: HttpBinResponse =
serde_json::from_slice(&body).unwrap();
body.json
})
}),
)
}
fn create_something_v1(
some_data: web::Json<SomeData>,
client: web::Data<Client>,
) -> Box<Future<Item = HttpResponse, Error = Error>> {
Box::new(
step_x_v1(some_data.into_inner(), &client).and_then(move |some_data_2| {
step_x_v1(some_data_2, &client).and_then(move |some_data_3| {
step_x_v1(some_data_3, &client).and_then(|d| {
Ok(HttpResponse::Ok()
.content_type("application/json")
.body(serde_json::to_string(&d).unwrap())
.into())
})
})
}),
)
}
// ---------------------------------------------------------------
// v2 uses impl Future, available as of rustc v1.26
// ---------------------------------------------------------------
/// post json to httpbin, get it back in the response body, return deserialized
fn step_x_v2(
data: SomeData, data: SomeData,
client: &Client, client: &Client,
) -> impl Future<Item = SomeData, Error = Error> { ) -> impl Future<Item = SomeData, Error = Error> {
@ -123,17 +71,16 @@ fn step_x_v2(
}) })
} }
fn create_something_v2( fn create_something(
some_data: web::Json<SomeData>, some_data: web::Json<SomeData>,
client: web::Data<Client>, client: web::Data<Client>,
) -> impl Future<Item = HttpResponse, Error = Error> { ) -> impl Future<Item = HttpResponse, Error = Error> {
step_x_v2(some_data.into_inner(), &client).and_then(move |some_data_2| { step_x(some_data.into_inner(), &client).and_then(move |some_data_2| {
step_x_v2(some_data_2, &client).and_then(move |some_data_3| { step_x(some_data_2, &client).and_then(move |some_data_3| {
step_x_v2(some_data_3, &client).and_then(|d| { step_x(some_data_3, &client).and_then(|d| {
Ok(HttpResponse::Ok() Ok(HttpResponse::Ok()
.content_type("application/json") .content_type("application/json")
.body(serde_json::to_string(&d).unwrap()) .body(serde_json::to_string(&d).unwrap()))
.into())
}) })
}) })
}) })
@ -142,19 +89,17 @@ fn create_something_v2(
fn main() -> io::Result<()> { fn main() -> io::Result<()> {
std::env::set_var("RUST_LOG", "actix_web=info"); std::env::set_var("RUST_LOG", "actix_web=info");
env_logger::init(); env_logger::init();
let endpoint = "127.0.0.1:8080";
println!("Starting server at: {:?}", endpoint);
HttpServer::new(|| { HttpServer::new(|| {
App::new() App::new()
.data(Client::default()) .data(Client::default())
.service( .service(
web::resource("/something_v1") web::resource("/something")
.route(web::post().to(create_something_v1)), .route(web::post().to_async(create_something)),
)
.service(
web::resource("/something_v2")
.route(web::post().to_async(create_something_v2)),
) )
}) })
.bind("127.0.0.1:8088")? .bind(endpoint)?
.run() .run()
} }