Adds TX signature to `TransactionContext` in debug mode (#29597)

Adds TX signature to TransactionContext in debug mode.

runtime/src/bank.rs

@@ -4227,6 +4227,8 @@ impl Bank {
         {
             transaction_context.enable_cap_accounts_data_allocations_per_transaction();
         }
+        #[cfg(debug_assertions)]
+        transaction_context.set_signature(tx.signature());
 
         let pre_account_state_info =
             self.get_transaction_account_state_info(&transaction_context, tx.message());

sdk/src/transaction_context.rs

@@ -1,6 +1,8 @@
 //! Data shared between program runtime and built-in programs as well as SBF programs.
 #![deny(clippy::indexing_slicing)]
 
+#[cfg(all(not(target_os = "solana"), debug_assertions))]
+use crate::signature::Signature;
 #[cfg(not(target_os = "solana"))]
 use crate::{
     account::WritableAccount,
@@ -68,6 +70,9 @@ pub struct TransactionContext {
     rent: Option<Rent>,
     #[cfg(not(target_os = "solana"))]
     is_cap_accounts_data_allocations_per_transaction_enabled: bool,
+    /// Useful for debugging to filter by or to look it up on the explorer
+    #[cfg(all(not(target_os = "solana"), debug_assertions))]
+    signature: Signature,
 }
 
 impl TransactionContext {
@@ -97,6 +102,8 @@ impl TransactionContext {
             accounts_resize_delta: RefCell::new(0),
             rent,
             is_cap_accounts_data_allocations_per_transaction_enabled: false,
+            #[cfg(all(not(target_os = "solana"), debug_assertions))]
+            signature: Signature::default(),
         }
     }
 
@@ -118,6 +125,18 @@ impl TransactionContext {
         self.rent.is_some()
     }
 
+    /// Stores the signature of the current transaction
+    #[cfg(all(not(target_os = "solana"), debug_assertions))]
+    pub fn set_signature(&mut self, signature: &Signature) {
+        self.signature = *signature;
+    }
+
+    /// Returns the signature of the current transaction
+    #[cfg(all(not(target_os = "solana"), debug_assertions))]
+    pub fn get_signature(&self) -> &Signature {
+        &self.signature
+    }
+
     /// Returns the total number of accounts loaded in this Transaction
     pub fn get_number_of_accounts(&self) -> IndexOfAccount {
         self.accounts.len() as IndexOfAccount