feat: truncate_block_range

Author: prestwich

crates/rpc-types-eth/src/filter.rs

@@ -634,6 +634,22 @@ impl Filter {
         }
     }
 
+    /// Bound the block range to the given range. If the filter is a range
+    /// filter, this will modify the `from_block` and `to_block` values to be
+    /// within the given range. If the filter is a block hash filter, this will
+    /// do nothing.
+    pub fn truncate_block_range(&mut self, min_from: u64, max_end: u64) {
+        if let FilterBlockOption::Range { from_block, to_block } = &mut self.block_option {
+            // bound to `from_block` to the greater of `from_block` and
+            // `min_from`
+            let from = from_block.get_or_insert(min_from);
+            *from = from.max(*min_from);
+            // bound to `to_block` to the lesser of `to_block` and `max_end`
+            let to = to_block.get_or_insert(max_end);
+            *to = to.min(*max_end);
+        }
+    }
+
     /// Returns `true` if at least one topic is set
     pub fn has_topics(&self) -> bool {
         self.topics.iter().any(|t| !t.is_empty())