Simplify replay vote tracking by using packet metadata (#21112)

sdk/src/transaction/sanitized.rs

@@ -22,6 +22,7 @@ use {
 pub struct SanitizedTransaction {
     message: SanitizedMessage,
     message_hash: Hash,
+    is_simple_vote_tx: bool,
     signatures: Vec<Signature>,
 }
 
@@ -41,6 +42,7 @@ impl SanitizedTransaction {
     pub fn try_create(
         tx: VersionedTransaction,
         message_hash: Hash,
+        is_simple_vote_tx: Option<bool>,
         address_mapper: impl Fn(&v0::Message) -> Result<MappedAddresses>,
     ) -> Result<Self> {
         tx.sanitize()?;
@@ -58,9 +60,15 @@ impl SanitizedTransaction {
             return Err(TransactionError::AccountLoadedTwice);
         }
 
+        let is_simple_vote_tx = is_simple_vote_tx.unwrap_or_else(|| {
+            let mut ix_iter = message.program_instructions_iter();
+            ix_iter.next().map(|(program_id, _ix)| program_id) == Some(&crate::vote::program::id())
+        });
+
         Ok(Self {
             message,
             message_hash,
+            is_simple_vote_tx,
             signatures,
         })
     }
@@ -76,6 +84,7 @@ impl SanitizedTransaction {
         Self {
             message_hash: tx.message.hash(),
             message: SanitizedMessage::Legacy(tx.message),
+            is_simple_vote_tx: false,
             signatures: tx.signatures,
         }
     }
@@ -106,6 +115,11 @@ impl SanitizedTransaction {
         &self.message_hash
     }
 
+    /// Returns true if this transaction is a simple vote
+    pub fn is_simple_vote_transaction(&self) -> bool {
+        self.is_simple_vote_tx
+    }
+
     /// Convert this sanitized transaction into a versioned transaction for
     /// recording in the ledger.
     pub fn to_versioned_transaction(&self) -> VersionedTransaction {