Merge pull request #199 from moonbeam-foundation/moonbeam-polkadot-v1…

….3.0-elfedy-fix-tr

Use previous block hash to compute tx effectiveGasPrice

client/rpc/src/eth/transaction.rs

@@ -214,7 +214,6 @@ where
 			block,
 			receipts,
 			statuses,
-			substrate_hash,
 			..
 		} = block_info.clone();
 		match (block, statuses, receipts) {
@@ -288,14 +287,25 @@ where
 				let effective_gas_price = match transaction {
 					EthereumTransaction::Legacy(t) => t.gas_price,
 					EthereumTransaction::EIP2930(t) => t.gas_price,
-					EthereumTransaction::EIP1559(t) => self
-						.client
-						.runtime_api()
-						.gas_price(substrate_hash)
-						.unwrap_or_default()
-						.checked_add(t.max_priority_fee_per_gas)
-						.unwrap_or_else(U256::max_value)
-						.min(t.max_fee_per_gas),
+					EthereumTransaction::EIP1559(t) => {
+						let parent_eth_hash = block.header.parent_hash;
+						let parent_substrate_hash = frontier_backend_client::load_hash::<B, C>(
+							self.client.as_ref(),
+							self.backend.as_ref(),
+							parent_eth_hash,
+						)
+						.await
+						.map_err(|err| internal_err(format!("{:?}", err)))?
+						.ok_or(internal_err("Failed to retrieve substrate parent block hash"))?;
+
+						self.client
+							.runtime_api()
+							.gas_price(parent_substrate_hash)
+							.unwrap_or_default()
+							.checked_add(t.max_priority_fee_per_gas)
+							.unwrap_or_else(U256::max_value)
+							.min(t.max_fee_per_gas)
+					}
 				};
 
 				return Ok(Some(Receipt {