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haesli_messaging/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "haesli_messaging"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+haesli_core = { path = "../haesli_core" }
+haesli_datastructure = { path = "../haesli_datastructure" }
+parking_lot = "0.12.0"
+tracing = "0.1.31"
+tokio = { version = "1.17.0", features = ["full"] }
+
+[features]

haesli_messaging/src/lib.rs

@@ -0,0 +1,9 @@
+#![warn(rust_2018_idioms)]
+#![deny(clippy::future_not_send)]
+
+use haesli_core::error::ProtocolError;
+
+pub mod methods;
+mod queue_worker;
+
+type Result<T> = std::result::Result<T, ProtocolError>;

haesli_messaging/src/methods/consume.rs

@@ -0,0 +1,60 @@
+use std::sync::Arc;
+
+use haesli_core::{
+    connection::Channel,
+    consumer::{Consumer, ConsumerId},
+    error::ChannelException,
+    haesli_todo,
+    methods::{BasicConsume, BasicConsumeOk, Method},
+};
+use tracing::info;
+
+use crate::Result;
+
+pub fn consume(channel: Channel, basic_consume: BasicConsume) -> Result<Method> {
+    let BasicConsume {
+        queue: queue_name,
+        consumer_tag,
+        no_local,
+        no_ack,
+        exclusive,
+        no_wait,
+        ..
+    } = basic_consume;
+
+    if no_wait || no_local || exclusive || no_ack {
+        haesli_todo!();
+    }
+
+    let global_data = channel.global_data.clone();
+
+    let consumer_tag = if consumer_tag.is_empty() {
+        haesli_core::random_uuid().to_string()
+    } else {
+        consumer_tag
+    };
+
+    let mut global_data = global_data.lock();
+
+    let queue = global_data
+        .queues
+        .get_mut(queue_name.as_str())
+        .ok_or(ChannelException::NotFound)?;
+
+    let consumer = Consumer {
+        id: ConsumerId::random(),
+        tag: consumer_tag.clone(),
+        channel: Arc::clone(&channel),
+        queue: Arc::clone(queue),
+    };
+
+    queue.consumers.lock().insert(consumer.id, consumer.clone());
+
+    channel.connection.consuming.lock().push(consumer);
+
+    info!(%queue_name, %consumer_tag, "Consumer started consuming");
+
+    let method = Method::BasicConsumeOk(BasicConsumeOk { consumer_tag });
+
+    Ok(method)
+}

haesli_messaging/src/methods/mod.rs

@@ -0,0 +1,61 @@
+mod consume;
+mod publish;
+mod queue;
+
+use haesli_core::{connection::Channel, haesli_todo, message::Message, methods::Method};
+use tracing::info;
+
+use crate::Result;
+
+pub fn handle_basic_publish(channel_handle: Channel, message: Message) -> Result<()> {
+    publish::publish(channel_handle, message)
+}
+
+pub async fn handle_method(channel_handle: Channel, method: Method) -> Result<Method> {
+    info!(?method, "Handling method");
+
+    let response = match method {
+        Method::ExchangeDeclare(_) => haesli_todo!(),
+        Method::ExchangeDeclareOk(_) => haesli_todo!(),
+        Method::ExchangeDelete(_) => haesli_todo!(),
+        Method::ExchangeDeleteOk(_) => haesli_todo!(),
+        Method::QueueDeclare(queue_declare) => queue::declare(channel_handle, queue_declare)?,
+        Method::QueueDeclareOk { .. } => haesli_todo!(),
+        Method::QueueBind(queue_bind) => queue::bind(channel_handle, queue_bind).await?,
+        Method::QueueBindOk(_) => haesli_todo!(),
+        Method::QueueUnbind { .. } => haesli_todo!(),
+        Method::QueueUnbindOk(_) => haesli_todo!(),
+        Method::QueuePurge { .. } => haesli_todo!(),
+        Method::QueuePurgeOk { .. } => haesli_todo!(),
+        Method::QueueDelete { .. } => haesli_todo!(),
+        Method::QueueDeleteOk { .. } => haesli_todo!(),
+        Method::BasicQos { .. } => haesli_todo!(),
+        Method::BasicQosOk(_) => haesli_todo!(),
+        Method::BasicConsume(consume) => consume::consume(channel_handle, consume)?,
+        Method::BasicConsumeOk { .. } => haesli_todo!(),
+        Method::BasicCancel { .. } => haesli_todo!(),
+        Method::BasicCancelOk { .. } => haesli_todo!(),
+        Method::BasicReturn { .. } => haesli_todo!(),
+        Method::BasicDeliver { .. } => haesli_todo!(),
+        Method::BasicGet { .. } => haesli_todo!(),
+        Method::BasicGetOk { .. } => haesli_todo!(),
+        Method::BasicGetEmpty { .. } => haesli_todo!(),
+        Method::BasicAck { .. } => haesli_todo!(),
+        Method::BasicReject { .. } => haesli_todo!(),
+        Method::BasicRecoverAsync { .. } => haesli_todo!(),
+        Method::BasicRecover { .. } => haesli_todo!(),
+        Method::BasicRecoverOk(_) => haesli_todo!(),
+        Method::TxSelect(_)
+        | Method::TxSelectOk(_)
+        | Method::TxCommit(_)
+        | Method::TxCommitOk(_)
+        | Method::TxRollback(_)
+        | Method::TxRollbackOk(_) => haesli_todo!(),
+        Method::BasicPublish { .. } => {
+            unreachable!("Basic.Publish is handled somewhere else because it has a body")
+        }
+        _ => unreachable!("Method handled by transport layer"),
+    };
+
+    Ok(response)
+}

haesli_messaging/src/methods/publish.rs

@@ -0,0 +1,39 @@
+use haesli_core::{
+    connection::Channel,
+    error::{ChannelException, ConException},
+    haesli_todo,
+    message::Message,
+    queue::QueueEvent,
+};
+use tracing::{debug, error};
+
+use crate::Result;
+
+pub fn publish(channel_handle: Channel, message: Message) -> Result<()> {
+    debug!(?message, "Publishing message");
+
+    let global_data = channel_handle.global_data.clone();
+
+    let routing = &message.routing;
+
+    if !routing.exchange.is_empty() {
+        haesli_todo!();
+    }
+
+    let global_data = global_data.lock();
+
+    let queue = global_data
+        .queues
+        .get(routing.routing_key.as_str())
+        .ok_or(ChannelException::NotFound)?;
+
+    queue
+        .event_send
+        .try_send(QueueEvent::PublishMessage(message))
+        .map_err(|err| {
+            error!(?err, "Failed to send message to queue event queue");
+            ConException::InternalError
+        })?;
+
+    Ok(())
+}

haesli_messaging/src/methods/queue.rs

@@ -0,0 +1,99 @@
+use std::sync::{atomic::AtomicUsize, Arc};
+
+use haesli_core::{
+    connection::Channel,
+    haesli_todo,
+    methods::{Method, QueueBind, QueueDeclare, QueueDeclareOk},
+    queue::{QueueDeletion, QueueId, QueueInner, QueueName},
+    GlobalData,
+};
+use parking_lot::Mutex;
+use tokio::sync::mpsc;
+
+use crate::{queue_worker::QueueTask, Result};
+
+pub fn declare(channel: Channel, queue_declare: QueueDeclare) -> Result<Method> {
+    let QueueDeclare {
+        queue: queue_name,
+        passive,
+        durable,
+        exclusive,
+        auto_delete,
+        no_wait,
+        arguments,
+        ..
+    } = queue_declare;
+
+    let queue_name = QueueName::new(queue_name.into());
+
+    if !arguments.is_empty() {
+        haesli_todo!();
+    }
+
+    // todo: durable is technically spec-compliant, the spec doesn't really require it, but it's a todo
+    // not checked here because it's the default for amqplib which is annoying
+    if passive || no_wait {
+        haesli_todo!();
+    }
+
+    let global_data = channel.global_data.clone();
+
+    let (event_send, event_recv) = mpsc::channel(10);
+
+    let id = QueueId::random();
+    let queue = Arc::new(QueueInner {
+        id,
+        name: queue_name.clone(),
+        messages: haesli_datastructure::MessageQueue::new(),
+        durable,
+        exclusive: exclusive.then(|| channel.id),
+        deletion: if auto_delete {
+            QueueDeletion::Auto(AtomicUsize::default())
+        } else {
+            QueueDeletion::Manual
+        },
+        consumers: Mutex::default(),
+        event_send,
+    });
+
+    {
+        let mut global_data_lock = global_data.lock();
+
+        global_data_lock
+            .queues
+            .entry(queue_name.clone())
+            .or_insert_with(|| queue.clone());
+    }
+
+    bind_queue(global_data.clone(), (), queue_name.clone().into_inner())?;
+
+    let queue_task = QueueTask::new(global_data, event_recv, queue);
+
+    tokio::spawn(async move { queue_task.start().await });
+
+    Ok(Method::QueueDeclareOk(QueueDeclareOk {
+        queue: queue_name.to_string(),
+        message_count: 0,
+        consumer_count: 0,
+    }))
+}
+
+pub async fn bind(_channel_handle: Channel, _queue_bind: QueueBind) -> Result<Method> {
+    haesli_todo!();
+}
+
+fn bind_queue(global_data: GlobalData, _exchange: (), routing_key: Arc<str>) -> Result<()> {
+    let mut global_data = global_data.lock();
+
+    // todo: don't
+    let queue = global_data
+        .queues
+        .get(&QueueName::new(routing_key.clone()))
+        .unwrap()
+        .clone();
+    global_data
+        .default_exchange
+        .insert(routing_key.to_string(), queue);
+
+    Ok(())
+}

haesli_messaging/src/queue_worker.rs

@@ -0,0 +1,105 @@
+use std::borrow::Borrow;
+
+use haesli_core::{
+    connection::ConnectionEvent,
+    consumer::Consumer,
+    message::Message,
+    methods::{BasicDeliver, Method},
+    queue::{Queue, QueueEvent, QueueEventReceiver},
+    GlobalData,
+};
+use tracing::info;
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub struct QueueTask {
+    global_data: GlobalData,
+    event_recv: QueueEventReceiver,
+    queue: Queue,
+}
+
+impl QueueTask {
+    fn show_name(&self) -> &str {
+        self.queue.name.borrow()
+    }
+
+    pub fn new(global_data: GlobalData, event_recv: QueueEventReceiver, queue: Queue) -> Self {
+        Self {
+            global_data,
+            event_recv,
+            queue,
+        }
+    }
+
+    #[tracing::instrument(skip(self), fields(name = self.show_name()))]
+    pub async fn start(mut self) {
+        info!("Started queue worker task");
+
+        loop {
+            let next_event = self.event_recv.recv().await;
+
+            match next_event {
+                Some(QueueEvent::PublishMessage(message)) => {
+                    self.handle_publish_message(message).await
+                }
+                Some(QueueEvent::Shutdown) | None => {
+                    self.cleanup().await;
+                    return;
+                }
+            }
+        }
+    }
+
+    #[tracing::instrument(skip(self), fields(name = self.show_name()), level = "debug")]
+    async fn handle_publish_message(&mut self, message: Message) {
+        // todo: we just send it to the consumer directly and ignore it if the consumer doesn't exist
+        // consuming is hard, but this should work *for now*
+
+        let could_deliver = {
+            let consumers = self.queue.consumers.lock();
+            if let Some(consumer) = consumers.values().next() {
+                Self::try_deliver(&message, consumer)
+            } else {
+                Err(())
+            }
+        };
+
+        if let Err(()) = could_deliver {
+            self.queue_message(message).await;
+        }
+    }
+
+    #[tracing::instrument(skip(consumer), level = "trace")]
+    fn try_deliver(message: &Message, consumer: &Consumer) -> Result<(), ()> {
+        let routing = &message.routing;
+
+        let method = Box::new(Method::BasicDeliver(BasicDeliver {
+            consumer_tag: consumer.tag.clone(),
+            delivery_tag: 0,
+            redelivered: false,
+            exchange: routing.exchange.clone(),
+            routing_key: routing.routing_key.clone(),
+        }));
+
+        let result = consumer
+            .channel
+            .event_sender
+            .try_send(ConnectionEvent::MethodContent(
+                consumer.channel.num,
+                method,
+                message.header.clone(),
+                message.content.clone(),
+            ));
+
+        result.map_err(drop)
+    }
+
+    #[tracing::instrument(skip(self), fields(name = self.show_name()), level = "trace")]
+    async fn queue_message(&mut self, message: Message) {
+        self.queue.messages.append(message);
+    }
+
+    async fn cleanup(&mut self) {
+        // do stuff or something like that id whatever
+    }
+}