implement cap blocks

cmd/monitor/monitor.go

@@ -419,17 +419,45 @@ func updateAllBlocks(ms *monitorStatus) []rpctypes.PolyBlock {
 	// default
 	blocks := make([]rpctypes.PolyBlock, 0)
 
-	ms.BlocksLock.RLock()
+	ms.BlocksLock.Lock()
+	defer ms.BlocksLock.Unlock()
+
+	// ensure the cap is maintained each time you read out the blocks.
+	capBlocks(ms)
 	for _, b := range ms.Blocks {
 		blocks = append(blocks, b)
 	}
-	ms.BlocksLock.RUnlock()
+	// ms.BlocksLock.RUnlock()
 
 	allBlocks := metrics.SortableBlocks(blocks)
 
 	return allBlocks
 }
 
+// Define a maximum number of blocks to keep in memory
+const maxBlocksInMemory = 1000
+
+// Function to manage the capping of blocks
+func capBlocks(ms *monitorStatus) {
+	ms.BlocksLock.Lock()
+	defer ms.BlocksLock.Unlock()
+
+	currentBlockCount := len(ms.Blocks)
+	if currentBlockCount > maxBlocksInMemory {
+		// Delete blocks that exceed the maxBlocksInMemory
+		// Assuming blocks are sorted by some identifier (e.g., block height)
+		// Here you'd need to figure out the correct logic to remove the oldest blocks
+		// depending on how your ms.Blocks is structured.
+		for key, _ := range ms.Blocks {
+			if currentBlockCount <= maxBlocksInMemory {
+				break
+			}
+			delete(ms.Blocks, key)
+			currentBlockCount--
+		}
+	}
+}
+
 func renderMonitorUI(ctx context.Context, ec *ethclient.Client, ms *monitorStatus, rpc *ethrpc.Client) error {
 	if err := ui.Init(); err != nil {
 		return err