From d4fca905f5a61207ba69ba7fee96ae51f19e5352 Mon Sep 17 00:00:00 2001
From: Meet Mangukiya <meet@flamy.dev>
Date: Mon, 21 Mar 2022 20:34:02 +0530
Subject: [PATCH] feat(core/TypedTransaction): add helper for calculating max
 cost of tx (#1070)

---
 ethers-core/src/types/transaction/eip2718.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ethers-core/src/types/transaction/eip2718.rs b/ethers-core/src/types/transaction/eip2718.rs
index 8fffc6ba..00a387b7 100644
--- a/ethers-core/src/types/transaction/eip2718.rs
+++ b/ethers-core/src/types/transaction/eip2718.rs
@@ -253,6 +253,16 @@ impl TypedTransaction {
         let encoded = self.rlp();
         keccak256(encoded).into()
     }
+
+    /// Max cost of the transaction
+    pub fn max_cost(&self) -> Option<U256> {
+        let gas_limit = self.gas();
+        let gas_price = self.gas_price();
+        match (gas_limit, gas_price) {
+            (Some(gas_limit), Some(gas_price)) => Some(gas_limit * gas_price),
+            _ => None,
+        }
+    }
 }
 
 /// Get a TypedTransaction directly from an rlp encoded byte stream