added actix_redis example

.travis.yml

@@ -36,6 +36,7 @@ script:
   - |
       cd async_db && cargo check && cd ..
       cd async_ex1 && cargo check && cd ..
+      cd actix_redis && cargo check && cd ..
       cd basics && cargo check && cd ..
       cd cookie-auth && cargo check && cd ..
       cd cookie-auth-full && cargo check && cd ..

Cargo.toml

@@ -1,6 +1,7 @@
 [workspace]
 members = [
   "./",
+  "actix_redis",
   "async_db",
   "async_ex1",
   "basics",

actix_redis/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "actix_redis"
+version = "0.1.0"
+authors = ["dowwie <dkcdkg@gmail.com>"]
+
+[dependencies]
+actix = "0.7.3"
+actix-web = "0.7.3"
+actix-redis = "0.5.1"
+futures = "0.1.23"
+redis-async = "0.4.0"
+serde = "1.0.71"
+serde_derive = "1.0.71"
+env_logger = "0.5.12"

actix_redis/README.md

@@ -0,0 +1,14 @@
+This project illustrates how to send multiple cache requests to redis in bulk, asynchronously.
+This asyncio approach resembles traditional redis pipelining.  Details about how this
+is so can be read at https://github.com/benashford/redis-async-rs/issues/19#issuecomment-412208018
+
+
+
+To test the demo, POST a json object containing three strings to the /cache_stuff endpoint:
+	{"one": "first entry",
+	 "two": "second entry",
+	 "three": "third entry" }
+
+
+
+These three entries will cache to redis, keyed accordingly.

actix_redis/src/main.rs

@@ -0,0 +1,86 @@
+extern crate actix;
+extern crate actix_redis;
+extern crate actix_web;
+extern crate env_logger;
+extern crate futures;
+#[macro_use] extern crate redis_async;
+extern crate serde;
+#[macro_use] extern crate serde_derive; 
+
+
+use std::sync::Arc;
+use actix::prelude::*;
+use actix_redis::{Command, RedisActor, Error as ARError}; 
+use actix_web::{middleware, server, App, HttpRequest, HttpResponse, Json,
+                AsyncResponder, http::Method, Error as AWError};
+use futures::future::{Future, join_all};
+use redis_async::resp::RespValue;
+
+
+#[derive(Deserialize)]
+pub struct CacheInfo {
+    one: String,
+    two: String,
+    three: String
+}
+
+
+fn cache_stuff((info, req): (Json<CacheInfo>, HttpRequest<AppState>))
+                -> impl Future<Item=HttpResponse, Error=AWError> {
+    let info = info.into_inner();
+    let redis = req.state().redis_addr.clone();
+
+    let one = redis.send(Command(resp_array!["SET", "mydomain:one", info.one]));
+    let two = redis.send(Command(resp_array!["SET", "mydomain:two", info.two]));
+    let three = redis.send(Command(resp_array!["SET", "mydomain:three", info.three]));
+
+    // Creates a future which represents a collection of the results of the futures
+    // given. The returned future will drive execution for all of its underlying futures,
+    // collecting the results into a destination `Vec<RespValue>` in the same order as they
+    // were provided. If any future returns an error then all other futures will be
+    // canceled and an error will be returned immediately. If all futures complete
+    // successfully, however, then the returned future will succeed with a `Vec` of
+    // all the successful results.
+    let info_set = join_all(vec![one, two, three].into_iter());
+
+    info_set
+    .map_err(AWError::from)
+    .and_then(|res: Vec<Result<RespValue, ARError>>|
+        // successful operations return "OK", so confirm that all returned as so
+        if !res.iter().all(|res| match res {
+                Ok(RespValue::SimpleString(x)) if x=="OK" => true,
+                                                        _ => false
+            }) {
+            Ok(HttpResponse::InternalServerError().finish())
+        } else {
+            Ok(HttpResponse::Ok().body("successfully cached values"))
+        }
+    )
+    .responder()
+}
+
+
+pub struct AppState {
+    pub redis_addr: Arc<Addr<RedisActor>>
+}
+
+fn main() {
+    ::std::env::set_var("RUST_LOG", "actix_web=info,actix_redis=info");
+    env_logger::init();
+    let sys = actix::System::new("actix_redis_ex");
+
+    server::new(|| {
+        let redis_addr = Arc::new(RedisActor::start("127.0.0.1:6379"));
+        let app_state = AppState{redis_addr};
+
+        App::with_state(app_state)
+            .middleware(middleware::Logger::default())
+            .resource("/cache_stuff", |r| r.method(Method::POST)
+                                           .with_async(cache_stuff))
+    }).bind("0.0.0.0:8080")
+        .unwrap()
+        .workers(1)
+        .start();
+
+    let _ = sys.run();
+}