fix(diri): ensure events are handled sorted by block number (#425)

## Description

Add block number sorting to ensure that events handling respect temporal
order.

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crates/diri/src/lib.rs

@@ -76,11 +76,15 @@ impl<S: Storage, E: EventHandler> Diri<S, E> {
             )
             .await?;
 
-        for (block_number, events) in blocks_events {
-            let block_timestamp = self.block_time(BlockId::Number(block_number)).await?;
+        // Handle events sorted by block number
+        let mut block_numbers: Vec<&u64> = blocks_events.keys().collect();
+        block_numbers.sort();
 
+        for block_number in block_numbers {
+            let block_timestamp = self.block_time(BlockId::Number(*block_number)).await?;
+            let events = blocks_events.get(block_number).unwrap();
             for any_event in events {
-                let orderbook_event: Event = match any_event.try_into() {
+                let orderbook_event: Event = match any_event.clone().try_into() {
                     Ok(ev) => ev,
                     Err(e) => {
                         trace!("Event can't be deserialized: {e}");
@@ -92,38 +96,38 @@ impl<S: Storage, E: EventHandler> Diri<S, E> {
                     Event::OrderPlaced(ev) => {
                         trace!("OrderPlaced found: {:?}", ev);
                         self.storage
-                            .register_placed(block_number, block_timestamp, &ev.into())
+                            .register_placed(*block_number, block_timestamp, &ev.into())
                             .await?;
                     }
                     Event::OrderCancelled(ev) => {
                         trace!("OrderCancelled found: {:?}", ev);
                         self.storage
-                            .register_cancelled(block_number, block_timestamp, &ev.into())
+                            .register_cancelled(*block_number, block_timestamp, &ev.into())
                             .await?;
                     }
                     Event::OrderFulfilled(ev) => {
                         trace!("OrderFulfilled found: {:?}", ev);
                         self.storage
-                            .register_fulfilled(block_number, block_timestamp, &ev.into())
+                            .register_fulfilled(*block_number, block_timestamp, &ev.into())
                             .await?;
                     }
                     Event::OrderExecuted(ev) => {
                         trace!("OrderExecuted found: {:?}", ev);
                         self.storage
-                            .register_executed(block_number, block_timestamp, &ev.into())
+                            .register_executed(*block_number, block_timestamp, &ev.into())
                             .await?;
                     }
                     Event::RollbackStatus(ev) => {
                         trace!("RollbackStatus found: {:?}", ev);
                         self.storage
-                            .status_back_to_open(block_number, block_timestamp, &ev.into())
+                            .status_back_to_open(*block_number, block_timestamp, &ev.into())
                             .await?;
                     }
                     _ => warn!("Orderbook event not handled: {:?}", orderbook_event),
                 };
             }
 
-            self.event_handler.on_block_processed(block_number).await;
+            self.event_handler.on_block_processed(*block_number).await;
         }
 
         Ok(())