Restructure folders (#411)

database_interactions/redis/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "actix_redis"
+version = "1.0.0"
+authors = ["dowwie <dkcdkg@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+actix = "0.10"
+actix-web = "3"
+actix-redis = "0.9"
+futures = "0.3"
+redis-async = "0.6.3"
+serde = { version = "1", features = ["derive"] }
+env_logger = "0.8"

database_interactions/redis/README.md

@@ -0,0 +1,15 @@
+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 /stuff endpoint:
+	{"one": "first entry",
+	 "two": "second entry",
+	 "three": "third entry" }
+
+
+These three entries will cache to redis, keyed accordingly.
+
+to delete these, simply issue a DELETE http request to /stuff endpoint

database_interactions/redis/src/main.rs

@@ -0,0 +1,94 @@
+use actix::prelude::*;
+use actix_redis::{Command, RedisActor};
+use actix_web::{middleware, web, App, Error as AWError, HttpResponse, HttpServer};
+use futures::future::join_all;
+use redis_async::{resp::RespValue, resp_array};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+pub struct CacheInfo {
+    one: String,
+    two: String,
+    three: String,
+}
+
+async fn cache_stuff(
+    info: web::Json<CacheInfo>,
+    redis: web::Data<Addr<RedisActor>>,
+) -> Result<HttpResponse, AWError> {
+    let info = info.into_inner();
+
+    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 res: Vec<Result<RespValue, AWError>> =
+        join_all(vec![one, two, three].into_iter())
+            .await
+            .into_iter()
+            .map(|item| {
+                item.map_err(AWError::from)
+                    .and_then(|res| res.map_err(AWError::from))
+            })
+            .collect();
+
+    // 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"))
+    }
+}
+
+async fn del_stuff(redis: web::Data<Addr<RedisActor>>) -> Result<HttpResponse, AWError> {
+    let res = redis
+        .send(Command(resp_array![
+            "DEL",
+            "mydomain:one",
+            "mydomain:two",
+            "mydomain:three"
+        ]))
+        .await?;
+
+    match res {
+        Ok(RespValue::Integer(x)) if x == 3 => {
+            Ok(HttpResponse::Ok().body("successfully deleted values"))
+        }
+        _ => {
+            println!("---->{:?}", res);
+            Ok(HttpResponse::InternalServerError().finish())
+        }
+    }
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    std::env::set_var("RUST_LOG", "actix_web=trace,actix_redis=trace");
+    env_logger::init();
+
+    HttpServer::new(|| {
+        let redis_addr = RedisActor::start("127.0.0.1:6379");
+
+        App::new()
+            .data(redis_addr)
+            .wrap(middleware::Logger::default())
+            .service(
+                web::resource("/stuff")
+                    .route(web::post().to(cache_stuff))
+                    .route(web::delete().to(del_stuff)),
+            )
+    })
+    .bind("0.0.0.0:8080")?
+    .run()
+    .await
+}