stole example from rabbitmq-tutorials

.forgejo/workflows/build_docker_images.yaml

@@ -40,9 +40,6 @@ jobs:
             #  add kvm support
             extra_nix_config: |
               system-features = nixos-test benchmark big-parallel kvm
-     
-
-    
       -
         name: Build, import, tag and push producer container
         run: nix build .#producer-container && docker image load --input result && docker image tag producer:latest git.4o1x5.dev/4o1x5/producer:latest && docker image push git.4o1x5.dev/4o1x5/producer:latest

Cargo.lock

@@ -737,6 +737,7 @@ dependencies = [
  "derive_builder",
  "dotenv",
  "env_logger",
+ "futures",
  "futures-lite 2.3.0",
  "lapin",
  "log",
@@ -2201,6 +2202,7 @@ dependencies = [
  "derive_builder",
  "dotenv",
  "env_logger",
+ "futures",
  "futures-lite 2.3.0",
  "lapin",
  "log",

consumer/Cargo.toml

@@ -20,6 +20,7 @@ dotenv = "0.15.0"
 lapin = "2.5.0"
 uuid = { version = "1.10.0", features = ["v4"] }
 futures-lite = "2.3.0"
+futures = "0.3.30"
 
 [dependencies.common]
 path = "../common"

consumer/src/main.rs

@@ -1,62 +1,94 @@
-use std::str::from_utf8;
-
 use common::EmailJob;
-use futures_lite::stream::StreamExt;
-use lapin::{
-    options::*,
-    publisher_confirm::Confirmation,
-    types::{FieldTable, ShortString},
-    BasicProperties, Connection, ConnectionProperties, Result,
-};
-use log::*;
+use futures::StreamExt;
+use lapin::{options::*, types::FieldTable, BasicProperties, Connection, ConnectionProperties};
+use std::fmt::Display;
+use std::{convert::TryInto, str::from_utf8};
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
+#[derive(Debug)]
+enum Error {
+    CannotDecodeArg,
+    MissingReplyTo,
+    MissingCorrelationId,
+}
+
+impl std::error::Error for Error {}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            Error::CannotDecodeArg => write!(f, "Cannot decode argument"),
+            Error::MissingReplyTo => write!(f, "Missing 'reply to' property"),
+            Error::MissingCorrelationId => write!(f, "Missing 'correlation id' property"),
+        }
+    }
+}
+
 #[tokio::main]
-async fn main() -> Result<()> {
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
     tracing_subscriber::registry()
         .with(tracing_subscriber::EnvFilter::new(
             std::env::var("RUST_LOG").unwrap_or_else(|_| "debug".into()),
         ))
         .with(tracing_subscriber::fmt::layer())
         .init();
-    // Open connection.
+    let addr = "amqp://127.0.0.1:5672";
+    let conn = Connection::connect(addr, ConnectionProperties::default()).await?;
+    let channel = conn.create_channel().await?;
 
-    let addr = std::env::var("AMQP_ADDR").unwrap_or_else(|_| "amqp://127.0.0.1:5672/%2f".into());
-    let conn = Connection::connect(&addr, ConnectionProperties::default())
-        .await
-        .unwrap();
+    channel
+        .queue_declare(
+            "rpc_queue",
+            QueueDeclareOptions::default(),
+            FieldTable::default(),
+        )
+        .await?;
 
-    info!("CONNECTED");
-    let channel_b = conn.create_channel().await.unwrap();
+    channel.basic_qos(1, BasicQosOptions::default()).await?;
 
-    // declare a consumer
-    let mut consumer = channel_b
+    let mut consumer = channel
         .basic_consume(
-            "email",
-            "",
+            "rpc_queue",
+            "rpc_server",
             BasicConsumeOptions::default(),
             FieldTable::default(),
         )
         .await?;
 
-    // watch for incoming messages
     while let Some(delivery) = consumer.next().await {
-        let delivery = delivery.expect("error in consumer");
-        let reply = delivery.properties.correlation_id();
-        log::info!("Reply id: {:?}", reply);
-        let data = serde_json::from_str::<EmailJob>(from_utf8(&delivery.data).unwrap()).unwrap();
-        channel_b
+        if let Ok(delivery) = delivery {
+            log::debug!("Received a request");
+
+            let data =
+                serde_json::from_str::<EmailJob>(from_utf8(&delivery.data).unwrap()).unwrap();
+
+            let routing_key = delivery
+                .properties
+                .reply_to()
+                .as_ref()
+                .ok_or(Error::MissingReplyTo)?
+                .as_str();
+
+            let correlation_id = delivery
+                .properties
+                .correlation_id()
+                .clone()
+                .ok_or(Error::MissingCorrelationId)?;
+
+            channel
                 .basic_publish(
                     "",
-                delivery.properties.reply_to().clone().unwrap().as_str(),
+                    routing_key,
                     BasicPublishOptions::default(),
-                format!("Sent email to {}", data.to()).as_bytes(),
-                BasicProperties::default(),
+                    &format!("Sent email to {}", data.to()).as_bytes(),
+                    BasicProperties::default().with_correlation_id(correlation_id),
                 )
-            .await
-            .unwrap();
-        delivery.ack(BasicAckOptions::default()).await.unwrap();
-        info!("Received emailjob  {:?} and replied back", data);
+                .await?;
+
+            channel
+                .basic_ack(delivery.delivery_tag, BasicAckOptions::default())
+                .await?;
+        }
     }
 
     Ok(())

producer/Cargo.toml

@@ -20,6 +20,7 @@ dotenv = "0.15.0"
 lapin = "2.5.0"
 uuid = { version = "1.10.0", features = ["v4"] }
 futures-lite = "2.3.0"
+futures = "0.3.30"
 
 [dependencies.common]
 path = "../common"

producer/src/main.rs

@@ -1,97 +1,133 @@
-use std::{str::from_utf8, thread, time::Duration};
-
 use common::EmailJobBuilder;
-use futures_lite::StreamExt;
+use futures::StreamExt;
 use lapin::{
-    options::*,
-    publisher_confirm::Confirmation,
-    types::{FieldTable, ShortString},
-    BasicProperties, Connection, ConnectionProperties, Result,
+    options::*, types::FieldTable, types::ShortString, BasicProperties, Channel, Connection,
+    ConnectionProperties, Consumer, Queue,
 };
-use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
+use serde::{de::DeserializeOwned, Serialize};
+use std::fmt::Display;
+use std::thread;
+use std::time::Duration;
+use std::{convert::TryInto, str::from_utf8};
 use uuid::Uuid;
+
+#[derive(Debug)]
+enum Error {
+    CannotDecodeReply,
+    NoReply,
+}
+
+impl std::error::Error for Error {}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            Error::CannotDecodeReply => write!(f, "Cannot decode reply"),
+            Error::NoReply => write!(f, "No reply arrived"),
+        }
+    }
+}
+
+struct RpcClient {
+    conn: Connection,
+    channel: Channel,
+    callback_queue: Queue,
+    consumer: Consumer,
+    correlation_id: ShortString,
+}
+
+impl RpcClient {
+    async fn new() -> Result<Self, lapin::Error> {
+        let addr = "amqp://127.0.0.1:5672";
+        let conn = Connection::connect(addr, ConnectionProperties::default()).await?;
+        let channel = conn.create_channel().await?;
+        let callback_queue = channel
+            .queue_declare(
+                "",
+                QueueDeclareOptions {
+                    exclusive: true,
+                    ..Default::default()
+                },
+                FieldTable::default(),
+            )
+            .await?;
+
+        let consumer = channel
+            .basic_consume(
+                callback_queue.name().as_str(),
+                "rpc_client",
+                BasicConsumeOptions {
+                    no_ack: true,
+                    ..Default::default()
+                },
+                FieldTable::default(),
+            )
+            .await?;
+
+        let correlation_id = Uuid::new_v4().to_string().into();
+
+        Ok(Self {
+            conn,
+            channel,
+            callback_queue,
+            consumer,
+            correlation_id,
+        })
+    }
+
+    async fn call<T>(&mut self, data: T) -> Result<String, Box<dyn std::error::Error>>
+    where
+        T: Serialize + DeserializeOwned,
+    {
+        self.channel
+            .basic_publish(
+                "",
+                "rpc_queue",
+                BasicPublishOptions::default(),
+                serde_json::to_string(&data).unwrap().as_bytes(),
+                BasicProperties::default()
+                    .with_reply_to(self.callback_queue.name().clone())
+                    .with_correlation_id(self.correlation_id.clone()),
+            )
+            .await?
+            .await?;
+
+        while let Some(delivery) = self.consumer.next().await {
+            if let Ok(delivery) = delivery {
+                if delivery.properties.correlation_id().as_ref() == Some(&self.correlation_id) {
+                    return Ok(from_utf8(&delivery.data).unwrap().to_string());
+                }
+            }
+        }
+
+        Err(Box::new(Error::NoReply))
+    }
+
+    async fn close(&self) -> Result<(), lapin::Error> {
+        self.conn.close(0, "").await
+    }
+}
+
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
     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 = std::env::var("AMQP_ADDR").unwrap_or_else(|_| "amqp://127.0.0.1:5672/%2f".into());
-    let conn = Connection::connect(&addr, ConnectionProperties::default())
-        .await
-        .unwrap();
-    let channel_a = conn.create_channel().await.unwrap();
-    let channel_b = conn.create_channel().await.unwrap();
+    let mut fibonacci_rpc = RpcClient::new().await?;
+    println!(" [x] Requesting fib(30)");
 
     let email = EmailJobBuilder::default()
         .to("someone@example.com".into())
-        .content("test".into())
+        .content("Hello there".into())
         .build()
         .unwrap();
-    let queue = channel_a
-        .queue_declare(
-            "email",
-            QueueDeclareOptions::default(),
-            FieldTable::default(),
-        )
-        .await
-        .unwrap();
-    let mut consumer = channel_a
-        .basic_consume(
-            "email",
-            "",
-            BasicConsumeOptions::default(),
-            FieldTable::default(),
-        )
-        .await
-        .unwrap();
-
-    let mut request = Uuid::new_v4();
     loop {
-        let confirm = channel_b
-            .basic_publish(
-                "",
-                "email",
-                BasicPublishOptions::default(),
-                serde_json::to_string(&email).unwrap().as_bytes(),
-                BasicProperties::default()
-                    .with_correlation_id(request.to_string().into())
-                    .with_reply_to(consumer.queue()),
-            )
-            .await
-            .unwrap()
-            .await
-            .unwrap();
-        while let Some(delivery) = consumer.next().await {
-            if let Ok(delivery) = delivery {
-                if delivery
-                    .properties
-                    .correlation_id()
-                    .as_ref()
-                    .unwrap_or(&ShortString::from("asd"))
-                    .eq(&ShortString::from(request.to_string()))
-                {
-                    log::info!(
-                        "Received data from consumer: {:?}",
-                        from_utf8(&delivery.data)
-                    );
-                    break;
-                } else {
-                    log::info!(
-                        "Received data from consumer: {:?}",
-                        from_utf8(&delivery.data)
-                    );
-                    log::error!("Received invalid delivery");
-                    break;
-                }
-            }
-        }
-
-        request = Uuid::new_v4();
-        log::info!("Sent request");
-
+        let response = fibonacci_rpc.call(email.clone()).await?;
+        log::info!("Got back fib: {}", response);
         thread::sleep(Duration::from_secs(1))
     }
 }