Add blob gas used to flashblocks diff (#440)

* Add blob gas used to flashblocks diff

* update to option

* Add quantity

* fix test

---------

Co-authored-by: Solar Mithril <[email protected]>

Author: avalonche

crates/flashblocks-rpc/src/tests/mod.rs

@@ -189,6 +189,7 @@ mod tests {
                 withdrawals: Vec::new(),
                 logs_bloom: Default::default(),
                 withdrawals_root: Default::default(),
+                blob_gas_used: Default::default(),
             },
             metadata: serde_json::to_value(Metadata {
                 block_number: 1,

crates/rollup-boost/src/flashblocks/primitives.rs

@@ -28,6 +28,13 @@ pub struct ExecutionPayloadFlashblockDeltaV1 {
     pub withdrawals: Vec<Withdrawal>,
     /// The withdrawals root of the block.
     pub withdrawals_root: B256,
+    /// The blob gas used
+    #[serde(
+        default,
+        skip_serializing_if = "Option::is_none",
+        with = "alloy_serde::quantity::opt"
+    )]
+    pub blob_gas_used: Option<u64>,
 }
 
 /// Represents the base configuration of an execution payload that remains constant

crates/rollup-boost/src/flashblocks/service.rs

@@ -114,7 +114,7 @@ impl FlashblockBuilder {
         let withdrawals_root = diff.withdrawals_root;
 
         let execution_payload = ExecutionPayloadV3 {
-            blob_gas_used: 0,
+            blob_gas_used: diff.blob_gas_used.unwrap_or(0),
             excess_blob_gas: 0,
             payload_inner: ExecutionPayloadV2 {
                 withdrawals,