feat: add host fills from built block to block header (#96)

# feat: add host fills from built block to block header

This PR adds the host fills from the build block to the rollup block header.

Closes ENG-1080

Author: dylanlott

src/tasks/submit.rs

@@ -192,9 +192,6 @@ impl SubmitTask {
         resp: &SignResponse,
         block: &BuiltBlock,
     ) -> Result<TransactionRequest, eyre::Error> {
-        // TODO: ENG-1082 Implement fills
-        let fills = vec![];
-
         // manually retrieve nonce
         let nonce =
             self.provider().get_transaction_count(self.provider().default_signer_address()).await?;
@@ -222,6 +219,10 @@ impl SubmitTask {
         };
         debug!(?header, "built block header");
 
+        // Extract fills from the built block
+        let fills = self.extract_fills(block);
+        debug!(?fills, "extracted fills");
+
         // Create a blob transaction with the blob header and signature values and return it
         let tx = self
             .build_blob_tx(fills, header, v, r, s, block)?
@@ -394,6 +395,11 @@ impl SubmitTask {
         Ok(block_num + 1)
     }
 
+    // This function converts &[SignedFill] into [FillPermit2]
+    fn extract_fills(&self, block: &BuiltBlock) -> Vec<FillPermit2> {
+        block.host_fills().iter().map(FillPermit2::from).collect()
+    }
+
     /// Task future for the submit task
     /// NB: This task assumes that the simulator will only send it blocks for
     /// slots that it's assigned.