v1.6: Use blake3 message hash in status cache (#16507)

runtime/src/hashed_transaction.rs

@@ -0,0 +1,50 @@
+use solana_sdk::{hash::Hash, transaction::Transaction};
+use std::borrow::Cow;
+
+/// Transaction and the hash of its message
+#[derive(Debug, Clone)]
+pub struct HashedTransaction<'a> {
+    transaction: Cow<'a, Transaction>,
+    pub message_hash: Hash,
+}
+
+impl<'a> HashedTransaction<'a> {
+    pub fn new(transaction: Cow<'a, Transaction>, message_hash: Hash) -> Self {
+        Self {
+            transaction,
+            message_hash,
+        }
+    }
+
+    pub fn transaction(&self) -> &Transaction {
+        self.transaction.as_ref()
+    }
+}
+
+impl<'a> From<Transaction> for HashedTransaction<'_> {
+    fn from(transaction: Transaction) -> Self {
+        Self {
+            message_hash: transaction.message().hash(),
+            transaction: Cow::Owned(transaction),
+        }
+    }
+}
+
+impl<'a> From<&'a Transaction> for HashedTransaction<'a> {
+    fn from(transaction: &'a Transaction) -> Self {
+        Self {
+            message_hash: transaction.message().hash(),
+            transaction: Cow::Borrowed(transaction),
+        }
+    }
+}
+
+pub trait HashedTransactionSlice<'a> {
+    fn as_transactions_iter(&'a self) -> Box<dyn Iterator<Item = &'a Transaction> + '_>;
+}
+
+impl<'a> HashedTransactionSlice<'a> for [HashedTransaction<'a>] {
+    fn as_transactions_iter(&'a self) -> Box<dyn Iterator<Item = &'a Transaction> + '_> {
+        Box::new(self.iter().map(|h| h.transaction.as_ref()))
+    }
+}