separate priority fee and transaction fee from fee calculation (#34757)

add function calculate_fee_details() that returns FeeDetails with base and priority fee separated

sdk/src/fee.rs

@@ -31,6 +31,19 @@ pub struct FeeStructure {
     pub compute_fee_bins: Vec<FeeBin>,
 }
 
+/// Return type of calculate_fee(...)
+#[derive(Debug, Default, Clone, Eq, PartialEq)]
+pub struct FeeDetails {
+    transaction_fee: u64,
+    prioritization_fee: u64,
+}
+
+impl FeeDetails {
+    pub fn total_fee(&self) -> u64 {
+        self.transaction_fee.saturating_add(self.prioritization_fee)
+    }
+}
+
 pub const ACCOUNT_DATA_COST_PAGE_SIZE: u64 = 32_u64.saturating_mul(1024);
 
 impl FeeStructure {
@@ -75,15 +88,32 @@ impl FeeStructure {
             .saturating_mul(heap_cost)
     }
 
-    /// Calculate fee for `SanitizedMessage`
     #[cfg(not(target_os = "solana"))]
     pub fn calculate_fee(
+        &self,
+        message: &SanitizedMessage,
+        lamports_per_signature: u64,
+        budget_limits: &FeeBudgetLimits,
+        include_loaded_account_data_size_in_fee: bool,
+    ) -> u64 {
+        self.calculate_fee_details(
+            message,
+            lamports_per_signature,
+            budget_limits,
+            include_loaded_account_data_size_in_fee,
+        )
+        .total_fee()
+    }
+
+    /// Calculate fee details for `SanitizedMessage`
+    #[cfg(not(target_os = "solana"))]
+    pub fn calculate_fee_details(
         &self,
         message: &SanitizedMessage,
         _lamports_per_signature: u64,
         budget_limits: &FeeBudgetLimits,
         include_loaded_account_data_size_in_fee: bool,
-    ) -> u64 {
+    ) -> FeeDetails {
         let signature_fee = message
             .num_signatures()
             .saturating_mul(self.lamports_per_signature);
@@ -115,12 +145,13 @@ impl FeeStructure {
                     .unwrap_or_default()
             });
 
-        (budget_limits
-            .prioritization_fee
-            .saturating_add(signature_fee)
-            .saturating_add(write_lock_fee)
-            .saturating_add(compute_fee) as f64)
-            .round() as u64
+        FeeDetails {
+            transaction_fee: (signature_fee
+                .saturating_add(write_lock_fee)
+                .saturating_add(compute_fee) as f64)
+                .round() as u64,
+            prioritization_fee: budget_limits.prioritization_fee,
+        }
     }
 }