feat: with monitoring

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn-server/src/event.rs

@@ -0,0 +1,78 @@
+use std::collections::HashMap;
+
+use std::sync::Arc;
+
+use axum::async_trait;
+
+use churn_domain::ServerEnrollReq;
+use serde::{ser::SerializeStruct, Deserialize, Serialize};
+use tokio::sync::{Mutex, RwLock};
+
+#[derive(Clone)]
+pub struct EventService(Arc<dyn EventServiceTrait + Send + Sync + 'static>);
+
+impl std::ops::Deref for EventService {
+    type Target = Arc<dyn EventServiceTrait + Send + Sync + 'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl Default for EventService {
+    fn default() -> Self {
+        Self(Arc::new(DefaultEventService::default()))
+    }
+}
+
+#[derive(Default)]
+struct DefaultEventService {
+    agents: Arc<RwLock<Vec<LogEvent>>>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct LogEvent {
+    pub id: uuid::Uuid,
+    pub author: String,
+    pub content: String,
+}
+
+impl LogEvent {
+    pub fn new(author: impl Into<String>, content: impl Into<String>) -> Self {
+        Self {
+            id: uuid::Uuid::new_v4(),
+            author: author.into(),
+            content: content.into(),
+        }
+    }
+}
+
+#[async_trait]
+pub trait EventServiceTrait {
+    async fn append(&self, req: LogEvent) -> anyhow::Result<()>;
+    async fn get_from_cursor(&self, cursor: uuid::Uuid) -> anyhow::Result<Vec<LogEvent>>;
+    async fn get_from_beginning(&self) -> anyhow::Result<Vec<LogEvent>>;
+}
+
+#[async_trait]
+impl EventServiceTrait for DefaultEventService {
+    async fn append(&self, req: LogEvent) -> anyhow::Result<()> {
+        let mut events = self.agents.write().await;
+        events.push(req);
+        Ok(())
+    }
+    async fn get_from_cursor(&self, cursor: uuid::Uuid) -> anyhow::Result<Vec<LogEvent>> {
+        let events = self.agents.read().await;
+        let items = events
+            .iter()
+            .skip_while(|item| item.id != cursor)
+            .skip(1)
+            .cloned()
+            .collect::<Vec<_>>();
+        Ok(items)
+    }
+    async fn get_from_beginning(&self) -> anyhow::Result<Vec<LogEvent>> {
+        let events = self.agents.read().await;
+        Ok(events.iter().cloned().collect())
+    }
+}