upgrade diesel, r2d2, state examples

async_db/src/main.rs

@@ -11,9 +11,7 @@ This project illustrates two examples:
  */
 use std::io;
 
-use actix_web::{
+use actix_web::{middleware, web, App, Error as AWError, HttpResponse, HttpServer};
-    middleware, web, App, Error as AWError, HttpResponse, HttpServer, State,
-};
 use futures::future::{join_all, ok as fut_ok, Future};
 use r2d2_sqlite;
 use r2d2_sqlite::SqliteConnectionManager;
@@ -23,7 +21,7 @@ use db::{Pool, Queries, WeatherAgg};
 
 /// Version 1: Calls 4 queries in sequential order, as an asynchronous handler
 fn asyncio_weather(
-    db: State<Pool>,
+    db: web::State<Pool>,
 ) -> impl Future<Item = HttpResponse, Error = AWError> {
     let mut result: Vec<Vec<WeatherAgg>> = vec![];
 
@@ -54,7 +52,7 @@ fn asyncio_weather(
 /// Version 2: Calls 4 queries in parallel, as an asynchronous handler
 /// Returning Error types turn into None values in the response
 fn parallel_weather(
-    db: State<Pool>,
+    db: web::State<Pool>,
 ) -> impl Future<Item = HttpResponse, Error = AWError> {
     let fut_result = vec![
         Box::new(db::execute(&db, Queries::GetTopTenHottestYears)),

basics/src/main.rs

@@ -1,8 +1,10 @@
+#[macro_use]
+extern crate actix_web;
+
 use std::{env, io};
 
 use actix_files as fs;
 use actix_session::{CookieSession, Session};
-use actix_web::extract::Path;
 use actix_web::http::{header, Method, StatusCode};
 use actix_web::{
     error, guard, middleware, web, App, Error, HttpRequest, HttpResponse, HttpServer,
@@ -13,11 +15,13 @@ use futures::unsync::mpsc;
 use futures::{future::ok, Future, Stream};
 
 /// favicon handler
+#[get("/favicon")]
 fn favicon() -> Result<fs::NamedFile> {
     Ok(fs::NamedFile::open("static/favicon.ico")?)
 }
 
 /// simple index handler
+#[get("/welcome")]
 fn welcome(session: Session, req: HttpRequest) -> Result<HttpResponse> {
     println!("{:?}", req);
 
@@ -52,7 +56,7 @@ fn index_async(req: HttpRequest) -> impl Future<Item = HttpResponse, Error = Err
 }
 
 /// async body
-fn index_async_body(path: Path<String>) -> HttpResponse {
+fn index_async_body(path: web::Path<String>) -> HttpResponse {
     let text = format!("Hello {}!", *path);
 
     let (tx, rx_body) = mpsc::unbounded();
@@ -63,7 +67,7 @@ fn index_async_body(path: Path<String>) -> HttpResponse {
 }
 
 /// handler with path parameters like `/user/{name}/`
-fn with_param(req: HttpRequest, path: Path<(String,)>) -> HttpResponse {
+fn with_param(req: HttpRequest, path: web::Path<(String,)>) -> HttpResponse {
     println!("{:?}", req);
 
     HttpResponse::Ok()
@@ -84,9 +88,9 @@ fn main() -> io::Result<()> {
             // cookie session middleware
             .middleware(CookieSession::signed(&[0; 32]).secure(false))
             // register favicon
-            .service(web::resource("/favicon").to(favicon))
+            .service(favicon)
             // register simple route, handle all methods
-            .service(web::resource("/welcome").to(welcome))
+            .service(welcome)
             // with path parameters
             .service(web::resource("/user/{name}").route(web::get().to(with_param)))
             // async handler

diesel/Cargo.toml

@@ -2,15 +2,14 @@
 name = "diesel-example"
 version = "0.1.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
-workspace = "../"
+workspace = ".."
+edition = "2018"
 
 [dependencies]
+actix-web = { git="https://github.com/actix/actix-web.git", branch = "1.0" }
+
 bytes = "0.4"
-env_logger = "0.5"
+env_logger = "0.6"
-
-actix = "0.7"
-actix-web = "0.7"
-
 futures = "0.1"
 uuid = { version = "0.5", features = ["serde", "v4"] }
 serde = "1.0"

diesel/src/db.rs

@@ -1,55 +0,0 @@
-//! Db executor actor
-use actix::prelude::*;
-use actix_web::*;
-use diesel;
-use diesel::prelude::*;
-use diesel::r2d2::{ConnectionManager, Pool};
-use uuid;
-
-use models;
-use schema;
-
-/// This is db executor actor. We are going to run 3 of them in parallel.
-pub struct DbExecutor(pub Pool<ConnectionManager<SqliteConnection>>);
-
-/// This is only message that this actor can handle, but it is easy to extend
-/// number of messages.
-pub struct CreateUser {
-    pub name: String,
-}
-
-impl Message for CreateUser {
-    type Result = Result<models::User, Error>;
-}
-
-impl Actor for DbExecutor {
-    type Context = SyncContext<Self>;
-}
-
-impl Handler<CreateUser> for DbExecutor {
-    type Result = Result<models::User, Error>;
-
-    fn handle(&mut self, msg: CreateUser, _: &mut Self::Context) -> Self::Result {
-        use self::schema::users::dsl::*;
-
-        let uuid = format!("{}", uuid::Uuid::new_v4());
-        let new_user = models::NewUser {
-            id: &uuid,
-            name: &msg.name,
-        };
-
-        let conn: &SqliteConnection = &self.0.get().unwrap();
-
-        diesel::insert_into(users)
-            .values(&new_user)
-            .execute(conn)
-            .map_err(|_| error::ErrorInternalServerError("Error inserting person"))?;
-
-        let mut items = users
-            .filter(id.eq(&uuid))
-            .load::<models::User>(conn)
-            .map_err(|_| error::ErrorInternalServerError("Error loading person"))?;
-
-        Ok(items.pop().unwrap())
-    }
-}

diesel/src/main.rs

@@ -4,77 +4,74 @@
 //! Actix supports sync actors by default, so we going to create sync actor
 //! that use diesel. Technically sync actors are worker style actors, multiple
 //! of them can run in parallel and process messages from same queue.
-extern crate serde;
-extern crate serde_json;
-#[macro_use]
-extern crate serde_derive;
 #[macro_use]
 extern crate diesel;
-extern crate actix;
+#[macro_use]
-extern crate actix_web;
+extern crate serde_derive;
-extern crate env_logger;
-extern crate futures;
-extern crate r2d2;
-extern crate uuid;
-extern crate bytes;
-// extern crate json;
-
-
-use bytes::BytesMut;
-use actix::prelude::*;
-use actix_web::{
-    http, middleware, server, App, AsyncResponder, FutureResponse, HttpResponse, Path, Error, HttpRequest,
-    State, HttpMessage, error, Json
-};
 
+use actix_web::{error, middleware, web, App, Error, HttpResponse, HttpServer};
+use bytes::{Bytes, BytesMut};
 use diesel::prelude::*;
-use diesel::r2d2::ConnectionManager;
+use diesel::r2d2::{self, ConnectionManager};
-use futures::{future, Future, Stream};
+use futures::future::{err, Either};
+use futures::{Future, Stream};
 
-mod db;
 mod models;
 mod schema;
 
-use db::{CreateUser, DbExecutor};
+type Pool = r2d2::Pool<ConnectionManager<SqliteConnection>>;
 
-/// State with DbExecutor address
+/// Diesel query
-struct AppState {
+fn query(
-    db: Addr<DbExecutor>,
+    nm: String,
+    pool: web::State<Pool>,
+) -> Result<models::User, diesel::result::Error> {
+    use self::schema::users::dsl::*;
+
+    let uuid = format!("{}", uuid::Uuid::new_v4());
+    let new_user = models::NewUser {
+        id: &uuid,
+        name: nm.as_str(),
+    };
+    let conn: &SqliteConnection = &pool.get().unwrap();
+
+    diesel::insert_into(users).values(&new_user).execute(conn)?;
+
+    let mut items = users.filter(id.eq(&uuid)).load::<models::User>(conn)?;
+    Ok(items.pop().unwrap())
 }
 
 /// Async request handler
 fn add(
-    (name, state): (Path<String>, State<AppState>),
+    name: web::Path<String>,
-) -> FutureResponse<HttpResponse> {
+    pool: web::State<Pool>,
-    // send async `CreateUser` message to a `DbExecutor`
+) -> impl Future<Item = HttpResponse, Error = Error> {
-    state
+    // run diesel blocking code
-        .db
+    web::block(move || query(name.into_inner(), pool)).then(|res| match res {
-        .send(CreateUser {
+        Ok(user) => Ok(HttpResponse::Ok().json(user)),
-            name: name.into_inner(),
+        Err(_) => Ok(HttpResponse::InternalServerError().into()),
-        })
+    })
-        .from_err()
-        .and_then(|res| match res {
-            Ok(user) => Ok(HttpResponse::Ok().json(user)),
-            Err(_) => Ok(HttpResponse::InternalServerError().into()),
-        })
-        .responder()
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 struct MyUser {
-    name: String
+    name: String,
 }
 
 const MAX_SIZE: usize = 262_144; // max payload size is 256k
 
 /// This handler manually load request payload and parse json object
-fn index_add((req, state): (HttpRequest<AppState>, State<AppState>)) -> impl Future<Item = HttpResponse, Error = Error> {
+fn index_add<P>(
-    // HttpRequest::payload() is stream of Bytes objects
+    pl: web::Payload<P>,
-    req.payload()
+    pool: web::State<Pool>,
+) -> impl Future<Item = HttpResponse, Error = Error>
+where
+    P: Stream<Item = Bytes, Error = error::PayloadError>,
+{
+    pl
         // `Future::from_err` acts like `?` in that it coerces the error type from
         // the future into the final error type
         .from_err()
-
         // `fold` will asynchronously read each chunk of the request body and
         // call supplied closure, then it resolves to result of closure
         .fold(BytesMut::new(), move |mut body, chunk| {
@@ -92,45 +89,39 @@ fn index_add((req, state): (HttpRequest<AppState>, State<AppState>)) -> impl Fut
         // Douman NOTE:
         // The return value in this closure helps, to clarify result for compiler
         // as otheriwse it cannot understand it
-        .and_then(move |body| -> Box<Future<Item = HttpResponse, Error = Error>> {
+        .and_then(move |body| {
             // body is loaded, now we can deserialize serde-json
             let r_obj = serde_json::from_slice::<MyUser>(&body);
 
             // Send to the db for create
             match r_obj {
                 Ok(obj) => {
-                let res = state.db.send(CreateUser { name: obj.name, })
+                    Either::A(web::block(move || query(obj.name, pool)).then(|res| {
-                               .from_err()
+                        match res {
-                               .and_then(|res| match res {
+                            Ok(user) => Ok(HttpResponse::Ok().json(user)),
-                                   Ok(user) => Ok(HttpResponse::Ok().json(user)),
+                            Err(_) => Ok(HttpResponse::InternalServerError().into()),
-                                   Err(_) => Ok(HttpResponse::InternalServerError().into()),
+                        }
-                               });
+                    }))
-
-                Box::new(res)
                 }
-                Err(_) => Box::new(future::err(error::ErrorBadRequest("Json Decode Failed")))
+                Err(_) => Either::B(err(error::ErrorBadRequest("Json Decode Failed"))),
             }
         })
 }
 
-fn add2((item, state): (Json<MyUser>, State<AppState>)) -> impl Future<Item = HttpResponse, Error = Error> {
+fn add2(
-    state.db
+    item: web::Json<MyUser>,
-         .send(CreateUser {
+    pool: web::State<Pool>,
-            // into_inner to move into the reference, then accessing name to
+) -> impl Future<Item = HttpResponse, Error = Error> {
-            // move the name out.
+    // run diesel blocking code
-             name: item.into_inner().name,
+    web::block(move || query(item.into_inner().name, pool)).then(|res| match res {
-         })
+        Ok(user) => Ok(HttpResponse::Ok().json(user)),
-         .from_err()
+        Err(_) => Ok(HttpResponse::InternalServerError().into()),
-         .and_then(|res| match res {
+    })
-             Ok(user) => Ok(HttpResponse::Ok().json(user)),
-             Err(_) => Ok(HttpResponse::InternalServerError().into()),
-         })
 }
 
-fn main() {
+fn main() -> std::io::Result<()> {
-    ::std::env::set_var("RUST_LOG", "actix_web=info");
+    std::env::set_var("RUST_LOG", "actix_web=info");
     env_logger::init();
-    let sys = actix::System::new("diesel-example");
 
     // Start 3 db executor actors
     let manager = ConnectionManager::<SqliteConnection>::new("test.db");
@@ -138,32 +129,29 @@ fn main() {
         .build(manager)
         .expect("Failed to create pool.");
 
-    let addr = SyncArbiter::start(3, move || DbExecutor(pool.clone()));
-
     // Start http server
-    server::new(move || {
+    HttpServer::new(move || {
-        App::with_state(AppState{db: addr.clone()})
+        App::new()
+            .state(pool.clone())
             // enable logger
             .middleware(middleware::Logger::default())
             // This can be called with:
             // curl -S --header "Content-Type: application/json" --request POST --data '{"name":"xyz"}'  http://127.0.0.1:8080/add
             // Use of the extractors makes some post conditions simpler such
             // as size limit protections and built in json validation.
-            .resource("/add2", |r| {
+            .service(
-                r.method(http::Method::POST)
+                web::resource("/add2").route(
-                    .with_async_config(add2, |(json_cfg, )| {
+                    web::post()
-                        json_cfg.0.limit(4096); // <- limit size of the payload
+                        .config(web::JsonConfig::default().limit(4096)) // <- limit size of the payload
-                    })
+                        .to_async(add2),
-            })
+                ),
+            )
             //  Manual parsing would allow custom error construction, use of
             //  other parsers *beside* json (for example CBOR, protobuf, xml), and allows
             //  an application to standardise on a single parser implementation.
-            .resource("/add", |r| r.method(http::Method::POST).with_async(index_add))
+            .service(web::resource("/add").route(web::post().to_async(index_add)))
-            .resource("/add/{name}", |r| r.method(http::Method::GET).with(add))
+            .service(web::resource("/add/{name}").route(web::get().to_async(add)))
-    }).bind("127.0.0.1:8080")
+    })
-        .unwrap()
+    .bind("127.0.0.1:8080")?
-        .start();
+    .run()
-
-    println!("Started http server: 127.0.0.1:8080");
-    let _ = sys.run();
 }

json/Cargo.toml

@@ -2,9 +2,12 @@
 name = "json-example"
 version = "0.1.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
-workspace = "../"
+workspace = ".."
+edition = "2018"
 
 [dependencies]
+actix-web = { git="https://github.com/actix/actix-web.git", branch = "1.0" }
+
 bytes = "0.4"
 futures = "0.1"
 env_logger = "*"
@@ -13,6 +16,3 @@ serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
 json = "*"
-
-actix = "0.7"
-actix-web = "^0.7"

json/src/main.rs

@@ -1,22 +1,13 @@
-extern crate actix;
-extern crate actix_web;
-extern crate bytes;
-extern crate env_logger;
-extern crate futures;
-extern crate serde_json;
-#[macro_use]
-extern crate serde_derive;
 #[macro_use]
 extern crate json;
 
 use actix_web::{
-    error, http, middleware, server, App, AsyncResponder, Error, HttpMessage,
+    error, middleware, web, App, Error, HttpRequest, HttpResponse, HttpServer,
-    HttpRequest, HttpResponse, Json,
 };
-
+use bytes::{Bytes, BytesMut};
-use bytes::BytesMut;
 use futures::{Future, Stream};
 use json::JsonValue;
+use serde_derive::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
 struct MyObj {
@@ -24,39 +15,34 @@ struct MyObj {
     number: i32,
 }
 
-/// This handler uses `HttpRequest::json()` for loading json object.
-fn index(req: &HttpRequest) -> Box<Future<Item = HttpResponse, Error = Error>> {
-    req.json()
-        .from_err()  // convert all errors into `Error`
-        .and_then(|val: MyObj| {
-            println!("model: {:?}", val);
-            Ok(HttpResponse::Ok().json(val))  // <- send response
-        })
-        .responder()
-}
-
 /// This handler uses json extractor
-fn extract_item(item: Json<MyObj>) -> HttpResponse {
+fn index(item: web::Json<MyObj>) -> HttpResponse {
     println!("model: {:?}", &item);
     HttpResponse::Ok().json(item.0) // <- send response
 }
 
 /// This handler uses json extractor with limit
-fn extract_item_limit((item, _req): (Json<MyObj>, HttpRequest)) -> HttpResponse {
+fn extract_item(item: web::Json<MyObj>, req: HttpRequest) -> HttpResponse {
-    println!("model: {:?}", &item);
+    println!("request: {:?}", req);
-    HttpResponse::Ok().json(item.0) // <- send response
+    println!("model: {:?}", item);
+
+    HttpResponse::Ok().json(item.0) // <- send json response
 }
 
 const MAX_SIZE: usize = 262_144; // max payload size is 256k
 
 /// This handler manually load request payload and parse json object
-fn index_manual(req: &HttpRequest) -> Box<Future<Item = HttpResponse, Error = Error>> {
+fn index_manual<P>(
-    // HttpRequest::payload() is stream of Bytes objects
+    payload: web::Payload<P>,
-    req.payload()
+) -> impl Future<Item = HttpResponse, Error = Error>
+where
+    P: Stream<Item = Bytes, Error = error::PayloadError>,
+{
+    // payload is a stream of Bytes objects
+    payload
         // `Future::from_err` acts like `?` in that it coerces the error type from
         // the future into the final error type
         .from_err()
-
         // `fold` will asynchronously read each chunk of the request body and
         // call supplied closure, then it resolves to result of closure
         .fold(BytesMut::new(), move |mut body, chunk| {
@@ -75,59 +61,56 @@ fn index_manual(req: &HttpRequest) -> Box<Future<Item = HttpResponse, Error = Er
             let obj = serde_json::from_slice::<MyObj>(&body)?;
             Ok(HttpResponse::Ok().json(obj)) // <- send response
         })
-        .responder()
 }
 
 /// This handler manually load request payload and parse json-rust
-fn index_mjsonrust(
+fn index_mjsonrust<P>(
-    req: &HttpRequest,
+    pl: web::Payload<P>,
-) -> Box<Future<Item = HttpResponse, Error = Error>> {
+) -> impl Future<Item = HttpResponse, Error = Error>
-    req.payload()
+where
-        .concat2()
+    P: Stream<Item = Bytes, Error = error::PayloadError>,
-        .from_err()
+{
-        .and_then(|body| {
+    pl.concat2().from_err().and_then(|body| {
-            // body is loaded, now we can deserialize json-rust
+        // body is loaded, now we can deserialize json-rust
-            let result = json::parse(std::str::from_utf8(&body).unwrap()); // return Result
+        let result = json::parse(std::str::from_utf8(&body).unwrap()); // return Result
-            let injson: JsonValue = match result {
+        let injson: JsonValue = match result {
-                Ok(v) => v,
+            Ok(v) => v,
-                Err(e) => object!{"err" => e.to_string() },
+            Err(e) => json::object! {"err" => e.to_string() },
-            };
+        };
-            Ok(HttpResponse::Ok()
+        Ok(HttpResponse::Ok()
-                .content_type("application/json")
+            .content_type("application/json")
-                .body(injson.dump()))
+            .body(injson.dump()))
-        })
+    })
-        .responder()
 }
 
-fn main() {
+fn main() -> std::io::Result<()> {
-    ::std::env::set_var("RUST_LOG", "actix_web=info");
+    std::env::set_var("RUST_LOG", "actix_web=info");
     env_logger::init();
-    let sys = actix::System::new("json-example");
 
-    server::new(|| {
+    HttpServer::new(|| {
         App::new()
             // enable logger
             .middleware(middleware::Logger::default())
-            .resource("/extractor", |r| {
+            .service(
-                r.method(http::Method::POST)
+                web::resource("/extractor").route(
-                    .with_config(extract_item, |(cfg,)| {
+                    web::post()
-                        cfg.limit(4096); // <- limit size of the payload
+                        .config(web::JsonConfig::default().limit(4096)) // <- limit size of the payload
-                    })
+                        .to(index),
-            })
+                ),
-            .resource("/extractor2", |r| {
+            )
-                r.method(http::Method::POST)
+            .service(
-                    .with_config(extract_item_limit, |((cfg, _),)| {
+                web::resource("/extractor2").route(
-                        cfg.limit(4096); // <- limit size of the payload
+                    web::post()
-                    })
+                        .config(web::JsonConfig::default().limit(4096)) // <- limit size of the payload
-            })
+                        .to_async(extract_item),
-            .resource("/manual", |r| r.method(http::Method::POST).f(index_manual))
+                ),
-            .resource("/mjsonrust", |r| r.method(http::Method::POST).f(index_mjsonrust))
+            )
-            .resource("/", |r| r.method(http::Method::POST).f(index))
+            .service(web::resource("/manual").route(web::post().to_async(index_manual)))
-    }).bind("127.0.0.1:8080")
+            .service(
-        .unwrap()
+                web::resource("/mjsonrust").route(web::post().to_async(index_mjsonrust)),
-        .shutdown_timeout(1)
+            )
-        .start();
+            .service(web::resource("/").route(web::post().to(index)))
-
+    })
-    println!("Started http server: 127.0.0.1:8080");
+    .bind("127.0.0.1:8080")?
-    let _ = sys.run();
+    .run()
 }

r2d2/src/main.rs

@@ -1,10 +1,7 @@
 //! Actix web r2d2 example
 use std::io;
 
-use actix_web::{
+use actix_web::{middleware, web, App, Error, HttpResponse, HttpServer};
-    blocking, extract::Path, middleware, web, App, Error, HttpResponse, HttpServer,
-    State,
-};
 use futures::Future;
 use r2d2::Pool;
 use r2d2_sqlite::SqliteConnectionManager;
@@ -12,11 +9,11 @@ use uuid;
 
 /// Async request handler. Ddb pool is stored in application state.
 fn index(
-    path: Path<String>,
+    path: web::Path<String>,
-    db: State<Pool<SqliteConnectionManager>>,
+    db: web::State<Pool<SqliteConnectionManager>>,
 ) -> impl Future<Item = HttpResponse, Error = Error> {
     // execute sync code in threadpool
-    blocking::run(move || {
+    web::block(move || {
         let conn = db.get().unwrap();
 
         let uuid = format!("{}", uuid::Uuid::new_v4());

state/Cargo.toml

@@ -2,11 +2,11 @@
 name = "state"
 version = "0.1.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
-workspace = "../"
+workspace = ".."
+edition = "2018"
 
 [dependencies]
-futures = "0.1"
+actix-web = { git="https://github.com/actix/actix-web.git", branch = "1.0" }
-env_logger = "0.5"
 
-actix = "0.7"
+futures = "0.1"
-actix-web = "0.7"
+env_logger = "0.6"

state/src/main.rs

@@ -1,7 +1,7 @@
 #![cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
-//! There are two level of statefulness in actix-web. Application has state
+//! Application may have multiple states that are shared across
-//! that is shared across all handlers within same Application.
+//! all handlers within same Application. State could be added
-//! And individual handler can have state.
+//! with `App::state()` method, multiple different states could be added.
 //!
 //! > **Note**: http server accepts an application factory rather than an
 //! application > instance. Http server constructs an application instance for
@@ -11,45 +11,34 @@
 //!
 //! Check [user guide](https://actix.rs/book/actix-web/sec-2-application.html) for more info.
 
-extern crate actix;
+use std::io;
-extern crate actix_web;
+use std::sync::{Arc, Mutex};
-extern crate env_logger;
 
-use std::sync::Arc;
+use actix_web::{middleware, web, App, HttpRequest, HttpResponse, HttpServer};
-use std::sync::Mutex;
-
-use actix_web::{middleware, server, App, HttpRequest, HttpResponse};
-
-/// Application state
-struct AppState {
-    counter: Arc<Mutex<usize>>,
-}
 
 /// simple handle
-fn index(req: &HttpRequest<AppState>) -> HttpResponse {
+fn index(state: web::State<Arc<Mutex<usize>>>, req: HttpRequest) -> HttpResponse {
     println!("{:?}", req);
-    *(req.state().counter.lock().unwrap()) += 1;
+    *(state.lock().unwrap()) += 1;
 
-    HttpResponse::Ok().body(format!("Num of requests: {}", req.state().counter.lock().unwrap()))
+    HttpResponse::Ok().body(format!("Num of requests: {}", state.lock().unwrap()))
 }
 
-fn main() {
+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();
-    let sys = actix::System::new("ws-example");
 
     let counter = Arc::new(Mutex::new(0));
+
     //move is necessary to give closure below ownership of counter
-    server::new(move || {
+    HttpServer::new(move || {
-        App::with_state(AppState{counter: counter.clone()}) // <- create app with shared state
+        App::new()
+            .state(counter.clone()) // <- create app with shared state
             // enable logger
             .middleware(middleware::Logger::default())
             // register simple handler, handle all methods
-            .resource("/", |r| r.f(index))
+            .service(web::resource("/").to(index))
-    }).bind("127.0.0.1:8080")
+    })
-        .unwrap()
+    .bind("127.0.0.1:8080")?
-        .start();
+    .run()
-
-    println!("Started http server: 127.0.0.1:8080");
-    let _ = sys.run();
 }