apalis implementation: now any messages incoming are sent to apalis to be processeds but I still haven't found a way to ack the message once the worker is done with the job

Cargo.lock

@@ -737,6 +737,7 @@ dependencies = [
  "derive_builder",
  "dotenv",
  "env_logger",
+ "envy",
  "futures",
  "futures-lite 2.3.0",
  "lapin",
@@ -1026,6 +1027,15 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "envy"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f47e0157f2cb54f5ae1bd371b30a2ae4311e1c028f575cd4e81de7353215965"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"

consumer/.env

@@ -0,0 +1,2 @@
+RABBITMQ_URL="amqp://127.0.0.1:5672"
+REDIS_URL=redis://:password@localhost/

consumer/Cargo.toml

@@ -21,6 +21,7 @@ lapin = "2.5.0"
 uuid = { version = "1.10.0", features = ["v4"] }
 futures-lite = "2.3.0"
 futures = "0.3.30"
+envy = "0.4.2"
 
 [dependencies.common]
 path = "../common"

consumer/src/main.rs

@@ -1,10 +1,26 @@
+use apalis::{
+    layers::tracing::TraceLayer,
+    prelude::{Data, Monitor, Storage, TaskId, WorkerBuilder, WorkerFactoryFn},
+    utils::TokioExecutor,
+};
+use apalis_redis::RedisStorage;
 use common::EmailJob;
-use futures::StreamExt;
-use lapin::{options::*, types::FieldTable, BasicProperties, Connection, ConnectionProperties};
-use std::fmt::Display;
-use std::{convert::TryInto, str::from_utf8};
+use futures::{io, StreamExt};
+use lapin::{
+    options::*,
+    protocol::channel,
+    types::{FieldTable, ShortString},
+    BasicProperties, Channel, Connection, ConnectionProperties, Consumer,
+};
+use serde::Deserialize;
+use std::{
+    convert::TryInto,
+    ops::Deref,
+    str::from_utf8,
+    sync::{atomic, Arc},
+};
+use std::{fmt::Display, thread, time::Duration};
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
-
 #[derive(Debug)]
 enum Error {
     CannotDecodeArg,
@@ -24,21 +40,32 @@ impl Display for Error {
     }
 }
 
+#[derive(Debug, Deserialize)]
+pub struct Configuration {
+    redis_url: String,
+    rabbitmq_url: String,
+}
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Get .env variables
+    let _ = dotenv::dotenv().ok();
+    // Enable tracing
     tracing_subscriber::registry()
         .with(tracing_subscriber::EnvFilter::new(
             std::env::var("RUST_LOG").unwrap_or_else(|_| "debug".into()),
         ))
         .with(tracing_subscriber::fmt::layer())
         .init();
-    let addr = "amqp://127.0.0.1:5672";
-    let conn = Connection::connect(addr, ConnectionProperties::default()).await?;
+
+    let c = envy::from_env::<Configuration>().expect("Invalid env vars");
+    let conn = Connection::connect(&c.rabbitmq_url, ConnectionProperties::default()).await?;
     let channel = conn.create_channel().await?;
 
+    // Declare queue for email jobs
     channel
         .queue_declare(
-            "rpc_queue",
+            "email_queue",
             QueueDeclareOptions::default(),
             FieldTable::default(),
         )
@@ -48,16 +75,51 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let mut consumer = channel
         .basic_consume(
-            "rpc_queue",
+            "email_queue",
             "rpc_server",
             BasicConsumeOptions::default(),
             FieldTable::default(),
         )
         .await?;
 
+    let conn = apalis_redis::connect(c.redis_url.clone()).await.unwrap();
+    let storage = apalis_redis::RedisStorage::new(conn);
+
+    let monitor = async {
+        Monitor::<TokioExecutor>::new()
+            .register_with_count(4, {
+                log::debug!("Spawning worker");
+                WorkerBuilder::new(&format!("scraper"))
+                    .layer(TraceLayer::new())
+                    .backend(storage.clone())
+                    .build_fn(handle_job)
+            })
+            .run()
+            .await
+            .unwrap()
+    };
+
+    let handler = handle_incoming(consumer, channel, storage.clone());
+
+    tokio::join!(monitor, handler);
+    Ok(())
+}
+
+async fn handle_job(job: EmailJob) -> String {
+    log::info!("Sent email to {} with task id:", job.to(),);
+    format!("Sent email to {}", job.to());
+    "asd".to_string()
+}
+
+async fn handle_incoming(
+    mut consumer: Consumer,
+    channel: Channel,
+    mut storage: RedisStorage<EmailJob>,
+) {
+    log::info!("Listening for incoming messages");
     while let Some(delivery) = consumer.next().await {
         if let Ok(delivery) = delivery {
-            log::debug!("Received a request");
+            log::debug!("Message received");
 
             let data =
                 serde_json::from_str::<EmailJob>(from_utf8(&delivery.data).unwrap()).unwrap();
@@ -66,30 +128,37 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .properties
                 .reply_to()
                 .as_ref()
-                .ok_or(Error::MissingReplyTo)?
+                .ok_or(Error::MissingReplyTo)
+                .unwrap()
                 .as_str();
 
             let correlation_id = delivery
                 .properties
                 .correlation_id()
                 .clone()
-                .ok_or(Error::MissingCorrelationId)?;
+                .ok_or(Error::MissingCorrelationId)
+                .unwrap();
 
-            channel
-                .basic_publish(
-                    "",
-                    routing_key,
-                    BasicPublishOptions::default(),
-                    &format!("Sent email to {}", data.to()).as_bytes(),
-                    BasicProperties::default().with_correlation_id(correlation_id),
-                )
-                .await?;
+            match storage.push(data).await {
+                Ok(task_id) => {
+                    log::debug!(
+                        "Job has been sent to the background worker with id: {}",
+                        task_id
+                    );
+                }
+                Err(error) => {
+                    log::error!(
+                        "Failed to send job to background worker: {}, rejecting in queue",
+                        error
+                    );
+                    channel
+                        .basic_nack(delivery.delivery_tag, BasicNackOptions::default())
+                        .await
+                        .unwrap();
 
-            channel
-                .basic_ack(delivery.delivery_tag, BasicAckOptions::default())
-                .await?;
+                    return;
+                }
+            }
         }
     }
-
-    Ok(())
 }

producer/src/main.rs

@@ -1,3 +1,4 @@
+// Original example taken from https://github.com/rabbitmq/rabbitmq-tutorials/tree/main/rust-lapin/src/bin
 use common::EmailJobBuilder;
 use futures::StreamExt;
 use lapin::{
@@ -82,7 +83,7 @@ impl RpcClient {
         self.channel
             .basic_publish(
                 "",
-                "rpc_queue",
+                "email_queue",
                 BasicPublishOptions::default(),
                 serde_json::to_string(&data).unwrap().as_bytes(),
                 BasicProperties::default()
@@ -117,8 +118,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         ))
         .with(tracing_subscriber::fmt::layer())
         .init();
+
     let mut fibonacci_rpc = RpcClient::new().await?;
-    println!(" [x] Requesting fib(30)");
 
     let email = EmailJobBuilder::default()
         .to("someone@example.com".into())
@@ -126,6 +127,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .build()
         .unwrap();
     loop {
+        log::info!("Sending message");
         let response = fibonacci_rpc.call(email.clone()).await?;
         log::info!("Got back fib: {}", response);
         thread::sleep(Duration::from_secs(1))