actix examples in actix release version

diesel/src/db.rs

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+//! Db executor actor
+use uuid;
+use diesel;
+use actix_web::*;
+use actix::prelude::*;
+use diesel::prelude::*;
+use diesel::r2d2::{Pool, ConnectionManager};
+
+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)
+            .expect("Error inserting person");
+
+        let mut items = users
+            .filter(id.eq(&uuid))
+            .load::<models::User>(conn)
+            .expect("Error loading person");
+
+        Ok(items.pop().unwrap())
+    }
+}

diesel/src/main.rs

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+//! Actix web diesel example
+//!
+//! Diesel does not support tokio, so we have to run it in separate threads.
+//! 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 r2d2;
+extern crate uuid;
+extern crate futures;
+extern crate actix;
+extern crate actix_web;
+extern crate env_logger;
+
+use actix::prelude::*;
+use actix_web::{http, server, middleware,
+                App, Path, State, HttpResponse, AsyncResponder, FutureResponse};
+
+use diesel::prelude::*;
+use diesel::r2d2::{ Pool, ConnectionManager };
+use futures::future::Future;
+
+mod db;
+mod models;
+mod schema;
+
+use db::{CreateUser, DbExecutor};
+
+
+/// State with DbExecutor address
+struct AppState {
+    db: Addr<Syn, DbExecutor>,
+}
+
+/// Async request handler
+fn index(name: Path<String>, state: State<AppState>) -> FutureResponse<HttpResponse> {
+    // send async `CreateUser` message to a `DbExecutor`
+    state.db.send(CreateUser{name: name.into_inner()})
+        .from_err()
+        .and_then(|res| {
+            match res {
+                Ok(user) => Ok(HttpResponse::Ok().json(user)),
+                Err(_) => Ok(HttpResponse::InternalServerError().into())
+            }
+        })
+        .responder()
+}
+
+fn main() {
+    ::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");
+    let pool = r2d2::Pool::builder().build(manager).expect("Failed to create pool.");
+
+    let addr = SyncArbiter::start(3, move || {
+        DbExecutor(pool.clone())
+    });
+
+    // Start http server
+    server::new(move || {
+        App::with_state(AppState{db: addr.clone()})
+            // enable logger
+            .middleware(middleware::Logger::default())
+            .resource("/{name}", |r| r.method(http::Method::GET).with2(index))})
+        .bind("127.0.0.1:8080").unwrap()
+        .start();
+
+    println!("Started http server: 127.0.0.1:8080");
+    let _ = sys.run();
+}

diesel/src/models.rs

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+use super::schema::users;
+
+#[derive(Serialize, Queryable)]
+pub struct User {
+    pub id: String,
+    pub name: String,
+}
+
+#[derive(Insertable)]
+#[table_name = "users"]
+pub struct NewUser<'a> {
+    pub id: &'a str,
+    pub name: &'a str,
+}

diesel/src/schema.rs

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+table! {
+    users (id) {
+        id -> Text,
+        name -> Text,
+    }
+}