refactor: separate server client boundaries

1 files changed, 39 insertions, 0 deletions

diff --git a/src/api/event_hub.rs b/src/api/event_hub.rs
new file mode 100644
index 00000000..b66a2157
--- /dev/null
+++ b/src/api/event_hub.rs
@@ -0,0 +1,39 @@
+#[derive(Clone, Default)]
+pub struct EventHub {
+    inner: std::sync::Arc<std::sync::Mutex<EventHubState>>,
+}
+
+#[derive(Default)]
+struct EventHubState {
+    next_sequence: u64,
+    events: Vec<(u64, crate::api::schema::EventEnvelope)>,
+}
+
+impl EventHub {
+    const MAX_EVENTS: usize = 512;
+
+    pub fn push(&self, event: crate::api::schema::EventEnvelope) {
+        let Ok(mut state) = self.inner.lock() else {
+            return;
+        };
+        state.next_sequence += 1;
+        let sequence = state.next_sequence;
+        state.events.push((sequence, event));
+        let overflow = state.events.len().saturating_sub(Self::MAX_EVENTS);
+        if overflow > 0 {
+            state.events.drain(0..overflow);
+        }
+    }
+
+    pub fn events_after(&self, sequence: u64) -> Vec<(u64, crate::api::schema::EventEnvelope)> {
+        let Ok(state) = self.inner.lock() else {
+            return Vec::new();
+        };
+        state
+            .events
+            .iter()
+            .filter(|(event_sequence, _)| *event_sequence > sequence)
+            .cloned()
+            .collect()
+    }
+}