wip: add test to task_manager

refs: #5

.idea/codeStyles/codeStyleConfig.xml

@@ -1,5 +1,6 @@
 <component name="ProjectCodeStyleConfiguration">
   <state>
     <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
   </state>
 </component>

Cargo.lock

@@ -1066,6 +1066,7 @@ dependencies = [
  "tabled",
  "thiserror",
  "tokio",
+ "tokio-stream",
  "tracing",
  "tracing-core",
  "tracing-subscriber",

lib_sync_core/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2024"
 [dependencies]
 directories = "6.0.0"
 tokio = { version = "1.45.0", features = ["default", "rt", "rt-multi-thread", "macros"] }
+tokio-stream = "0.1.17"
 sqlx = { version = "0.8", features = ["runtime-tokio", "sqlite", "chrono", "migrate", "uuid"] }
 clap = { version = "4.5.37", features = ["derive"] }
 serde = { version = "1.0.219", features = ["derive"] }

lib_sync_core/src/database.rs

@@ -15,10 +15,10 @@ impl TaskPagination {
     }
 
     pub fn next(&self) -> Self {
-       Self {
+        Self {
             offset: self.offset.saturating_add(self.limit.unwrap_or(0)),
-           ..self.clone()
-       }
+            ..self.clone()
+        }
     }
 
     pub fn prev(&self) -> Self {
@@ -45,20 +45,17 @@ impl TaskPagination {
 }
 
 pub struct TasksPage<T: TaskPayload> {
-   tasks: Vec<Task<T>>, 
-   page: TaskPagination
+    tasks: Vec<Task<T>>,
+    page: TaskPagination,
 }
 
 impl<T: TaskPayload> TasksPage<T> {
     fn new(tasks: Vec<Task<T>>, page: TaskPagination) -> Self {
-       Self {
-           tasks,
-           page
-       } 
+        Self { tasks, page }
     }
 
     pub fn next(&self) -> TaskPagination {
-       self.page.next() 
+        self.page.next()
     }
 
     pub fn prev(&self) -> TaskPagination {
@@ -67,11 +64,13 @@ impl<T: TaskPayload> TasksPage<T> {
 }
 
 pub trait TaskStorage<T: TaskPayload> {
-    async fn insert_tasks<'a, I: IntoIterator<Item=&'a Task<T>>>(&self, tasks: I) -> crate::Result<()>;
+    async fn insert_tasks<'a, I: IntoIterator<Item = &'a Task<T>>>(
+        &self,
+        tasks: I,
+    ) -> crate::Result<()>;
     fn get_tasks(&self, task_status: TaskStatus) -> impl Stream<Item = crate::Result<Task<T>>>;
 
-    async fn listen_tasks(&self, task_status: TaskStatus) -> crate::Result<()>;
+    fn listen_tasks(&self, task_status: TaskStatus) -> impl Stream<Item = crate::Result<Task<T>>>;
 
     async fn get_paginated_tasks(&self, page: TaskPagination) -> crate::Result<TasksPage<T>>;
 }
-

lib_sync_core/src/database/sqlite.rs

@@ -108,10 +108,11 @@ impl<T: TaskPayload> TaskStorage<T> for Sqlite {
         query.fetch(&self.pool).err_into::<crate::Error>()
     }
 
-    async fn listen_tasks(&self, task_status: TaskStatus) -> crate::error::Result<()> {
-        todo!()
+    fn listen_tasks(&self, task_status: TaskStatus) -> impl Stream<Item=crate::error::Result<Task<T>>> {
+        futures::stream::empty()
     }
 
+
     async fn get_paginated_tasks(&self, page: TaskPagination) -> crate::Result<TasksPage<T>> {
         let mut builder: QueryBuilder<'_, sqlx::Sqlite> = QueryBuilder::new(
             "select id, payload_key, payload, status_id, created_at, updated_at from tasks ",

lib_sync_core/src/tasks.rs

@@ -6,6 +6,8 @@ use tabled::Tabled;
 
 mod manager;
 mod jobs;
+mod worker;
+mod bus;
 
 #[derive(sqlx::Type, Debug, Clone)]
 #[repr(u8)]
@@ -75,9 +77,7 @@ impl<T: TaskPayload> Task<T> {
     pub fn payload(&self) -> &T {
         &self.payload
     }
-}
 
-impl<T: TaskPayload> Task<T> {
     pub fn get_key(&self) -> String {
         self.payload_key.clone()
     }

lib_sync_core/src/tasks/bus.rs

@@ -0,0 +1,4 @@
+#[derive(Clone)]
+pub enum Bus {
+	Local,
+}

lib_sync_core/src/tasks/manager.rs

@@ -1,9 +1,14 @@
 use crate::database::TaskStorage;
+use crate::tasks::bus::Bus;
 use crate::tasks::jobs::TaskJob;
 use crate::tasks::{Task, TaskPayload, TaskStatus};
 use futures::StreamExt;
-use futures::stream::FuturesOrdered;
 use std::marker::PhantomData;
+use std::pin::pin;
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::{mpsc, oneshot};
+use tokio::sync::oneshot::Sender;
+use crate::tasks::worker::TaskMessage;
 
 pub enum RateLimit {
     Buffer(usize),
@@ -12,11 +17,12 @@ pub enum RateLimit {
     None,
 }
 
-pub struct ExecuteOptions {
+pub struct ManagerOptions {
     rate_limit: RateLimit,
+    bus: Bus,
 }
 
-impl ExecuteOptions {
+impl ManagerOptions {
     pub fn new() -> Self {
         Self::default()
     }
@@ -27,22 +33,23 @@ impl ExecuteOptions {
     }
 }
 
-impl Default for ExecuteOptions {
+impl Default for ManagerOptions {
     fn default() -> Self {
         Self {
             rate_limit: RateLimit::None,
+            bus: Bus::Local,
         }
     }
 }
 
 struct TaskManager<S: TaskPayload, T: TaskStorage<S>> {
     storage: T,
-    options: ExecuteOptions,
+    options: ManagerOptions,
     _marker: PhantomData<S>,
 }
 
 impl<S: TaskPayload, T: TaskStorage<S>> TaskManager<S, T> {
-    pub fn new(storage: T, options: ExecuteOptions) -> Self {
+    pub fn new(storage: T, options: ManagerOptions) -> Self {
         Self {
             storage,
             options,
@@ -50,18 +57,31 @@ impl<S: TaskPayload, T: TaskStorage<S>> TaskManager<S, T> {
         }
     }
 
-    pub async fn run_tasks(&self, func: TaskJob<S>) -> crate::Result<()> {
+    pub async fn run_tasks(&self, mut task_sink:  TaskMessage<S>) -> crate::Result<()> {
         let rows = self.storage.get_tasks(TaskStatus::Pending);
+        let listener = self.storage.listen_tasks(TaskStatus::Pending);
 
-        let result: Vec<(Task<S>, TaskStatus)> = rows
-            .map(async |x| {
-                let task = x.unwrap();
-                let status = func(&task);
+        let mut queue = pin!(rows.chain(listener));
 
-                (task, status)
-            })
-            .collect()
-            .await;
+        while let Some(task) = queue.next().await {
+            let task = match task {
+                Ok(task) => task,
+                Err(e) => {
+                    continue
+                }
+            };
+
+            let sink = match task_sink.recv().await {
+                Some(s) => s,
+                None => break, // sink has stoped requesting tasks
+            };
+
+            if let Err(_) = sink.send(task) {
+                continue;
+            }
+
+            // (task, status)
+        }
 
         Ok(())
     }
@@ -71,12 +91,17 @@ impl<S: TaskPayload, T: TaskStorage<S>> TaskManager<S, T> {
 mod tests {
     use super::*;
     use crate::database::{TaskPagination, TasksPage};
+    use async_stream::stream;
     use fake::{Dummy, Fake, Faker};
-    use futures::{Stream, StreamExt};
+    use futures::Stream;
     use serde::{Deserialize, Serialize};
-    use sqlx::Row;
     use sqlx::types::Uuid;
+    use sync::mpsc;
+    use tokio::sync;
+    use tokio_stream::wrappers::ReceiverStream;
     use tracing_test::traced_test;
+    use crate::error::Error;
+    use crate::tasks::worker::{Worker, WorkerManager};
 
     #[derive(Dummy, Serialize, Deserialize, Debug)]
     struct DummyTaskPayload {
@@ -98,7 +123,7 @@ mod tests {
         fn get_tasks(
             &self,
             task_status: TaskStatus,
-        ) -> impl Stream<Item = crate::error::Result<Task<DummyTaskPayload>>> {
+        ) -> impl Stream<Item = crate::Result<Task<DummyTaskPayload>>> {
             let payloads: Vec<DummyTaskPayload> = Faker.fake();
 
             let tasks = payloads.into_iter().enumerate().map(move |(i, item)| {
@@ -108,24 +133,27 @@ mod tests {
             futures::stream::iter(tasks)
         }
 
-        async fn listen_tasks(&self, task_status: TaskStatus) -> crate::error::Result<()> {
-        todo!()
-    }
-        async fn listen_tasks2(&self, task_status: TaskStatus) -> FuturesOrdered<impl Future<Output=Task<DummyTaskPayload>> + Sized> {
-            let mut fifo = FuturesOrdered::new();
+        fn listen_tasks(
+            &self,
+            task_status: TaskStatus,
+        ) -> impl Stream<Item = crate::Result<Task<DummyTaskPayload>>> {
+            let (tx, rx) = mpsc::channel::<crate::Result<Task<DummyTaskPayload>>>(10);
 
             tokio::spawn(async move {
-                loop {
+                for _ in 0..10 {
                     tokio::time::sleep(std::time::Duration::from_millis(250)).await;
+
                     let payload: DummyTaskPayload = Faker.fake();
                     let task_status: TaskStatus = task_status.clone();
-                    fifo.push_back(async move {
-                        Task::new(payload.key.to_string(), payload, task_status)
-                    });
+                    let task = Ok(Task::new(payload.key.to_string(), payload, task_status));
+
+                    if let Err(_) = tx.send(task).await {
+                        break;
+                    }
                 }
             });
 
-            fifo
+            ReceiverStream::new(rx)
         }
 
         async fn get_paginated_tasks(
@@ -136,12 +164,27 @@ mod tests {
         }
     }
 
+    struct DummyWorker;
+
+    impl Worker<DummyTaskPayload> for DummyWorker {
+        fn process_job(task: &Task<DummyTaskPayload>) -> crate::error::Result<()> {
+            println!("{:#?}", task);
+            Ok(())
+        }
+
+        async fn on_job_failure(task: &Task<DummyTaskPayload>, error: Error) -> crate::error::Result<()> {
+            println!("{:#?} {:?}", task, error);
+            Ok(())
+        }
+    }
+
     #[tokio::test]
     #[traced_test]
     async fn manager_runs() {
-        let execute_options = ExecuteOptions::new();
-        let manager = TaskManager::new(DummyTaskStorage {}, execute_options);
+        let execute_options = ManagerOptions::new();
+        let local_worker_sink =  WorkerManager::get_listener_sink::<DummyTaskPayload, DummyWorker>(execute_options.bus.clone());
+        let task_manager = TaskManager::new(DummyTaskStorage {}, execute_options);
 
-        manager.run_tasks(|_| TaskStatus::Completed).await.unwrap();
+        task_manager.run_tasks(local_worker_sink).await.unwrap()
     }
 }

lib_sync_core/src/tasks/worker.rs

@@ -0,0 +1,48 @@
+use crate::error::Error;
+use crate::tasks::bus::Bus;
+use crate::tasks::{Task, TaskPayload};
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::oneshot::Sender;
+use tokio::sync::{mpsc, oneshot};
+
+pub type TaskMessage<T> = Receiver<Sender<Task<T>>>;
+
+pub struct WorkerManager;
+
+impl WorkerManager {
+    pub fn get_listener_sink<T: TaskPayload, W: Worker<T>>(bus: Bus) -> TaskMessage<T> {
+        match bus {
+            Bus::Local => {
+                let (bus_tx, bus_rx) = mpsc::channel(100);
+                tokio::spawn(async move {
+                    loop {
+                        // TODO: properly catch errors
+                        let (tx, rx) = oneshot::channel();
+                        
+                        // Request a task
+                        bus_tx.send(tx).await.unwrap();
+                        
+                        // Wait for a task to be returned
+                        let task = rx.await.unwrap();
+                        
+                        W::process_job(&task).unwrap();
+                    }
+                });
+
+                bus_rx
+            }
+        }
+    }
+}
+
+pub trait Worker<T: TaskPayload> {
+    async fn pre_process_job(task: &Task<T>) -> crate::Result<()> {
+        Ok(())
+    }
+    fn process_job(task: &Task<T>) -> crate::Result<()>;
+    async fn post_process_job(task: &Task<T>) -> crate::Result<()> {
+        Ok(())
+    }
+
+    async fn on_job_failure(task: &Task<T>, error: Error) -> crate::Result<()>;
+}