From 08c51d904cb2ff768200de47d32818307b1d814a Mon Sep 17 00:00:00 2001
From: Nikhil Gupta <17176722+gupnik@users.noreply.github.com>
Date: Sat, 18 May 2024 17:44:22 +0530
Subject: [PATCH] Adds transaction payment rpc in minimal template

---
 Cargo.lock                           |  1 +
 templates/minimal/node/Cargo.toml    |  1 +
 templates/minimal/node/src/rpc.rs    |  5 ++++-
 templates/minimal/runtime/src/lib.rs | 26 ++++++++++++++++++++++++++
 4 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 2a4b9b138bf8..2515c397d998 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8421,6 +8421,7 @@ dependencies = [
  "futures-timer",
  "jsonrpsee",
  "minimal-template-runtime",
+ "pallet-transaction-payment-rpc",
  "polkadot-sdk-frame",
  "sc-basic-authorship",
  "sc-cli",
diff --git a/templates/minimal/node/Cargo.toml b/templates/minimal/node/Cargo.toml
index 606fd0580356..c6c71c968da0 100644
--- a/templates/minimal/node/Cargo.toml
+++ b/templates/minimal/node/Cargo.toml
@@ -45,6 +45,7 @@ sp-block-builder = { path = "../../../substrate/primitives/block-builder" }
 sp-io = { path = "../../../substrate/primitives/io" }
 sp-runtime = { path = "../../../substrate/primitives/runtime" }
 
+pallet-transaction-payment-rpc = { path = "../../../substrate/frame/transaction-payment/rpc" }
 substrate-frame-rpc-system = { path = "../../../substrate/utils/frame/rpc/system" }
 
 # Once the native runtime is gone, there should be little to no dependency on FRAME here, and
diff --git a/templates/minimal/node/src/rpc.rs b/templates/minimal/node/src/rpc.rs
index d0c417a93d7a..636fb03b44c4 100644
--- a/templates/minimal/node/src/rpc.rs
+++ b/templates/minimal/node/src/rpc.rs
@@ -23,7 +23,8 @@
 #![warn(missing_docs)]
 
 use jsonrpsee::RpcModule;
-use runtime::interface::{AccountId, Nonce, OpaqueBlock};
+use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApiServer};
+use runtime::interface::{AccountId, Balance, Nonce, OpaqueBlock};
 use sc_transaction_pool_api::TransactionPool;
 use sp_blockchain::{Error as BlockChainError, HeaderBackend, HeaderMetadata};
 use std::sync::Arc;
@@ -55,12 +56,14 @@ where
 		+ 'static,
 	C::Api: sp_block_builder::BlockBuilder<OpaqueBlock>,
 	C::Api: substrate_frame_rpc_system::AccountNonceApi<OpaqueBlock, AccountId, Nonce>,
+	C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<OpaqueBlock, Balance>,
 	P: TransactionPool + 'static,
 {
 	let mut module = RpcModule::new(());
 	let FullDeps { client, pool, deny_unsafe } = deps;
 
 	module.merge(System::new(client.clone(), pool.clone(), deny_unsafe).into_rpc())?;
+	module.merge(TransactionPayment::new(client).into_rpc())?;
 
 	Ok(module)
 }
diff --git a/templates/minimal/runtime/src/lib.rs b/templates/minimal/runtime/src/lib.rs
index d2debbf5689f..7a4cb262f767 100644
--- a/templates/minimal/runtime/src/lib.rs
+++ b/templates/minimal/runtime/src/lib.rs
@@ -271,6 +271,32 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl pallet_transaction_payment_rpc_runtime_api::TransactionPaymentCallApi<
+		Block,
+		interface::Balance,
+		RuntimeCall
+	> for Runtime
+	{
+		fn query_call_info(
+			call: RuntimeCall,
+			len: u32,
+		) -> RuntimeDispatchInfo<interface::Balance> {
+			TransactionPayment::query_call_info(call, len)
+		}
+		fn query_call_fee_details(
+			call: RuntimeCall,
+			len: u32,
+		) -> FeeDetails<interface::Balance> {
+			TransactionPayment::query_call_fee_details(call, len)
+		}
+		fn query_weight_to_fee(weight: Weight) -> interface::Balance {
+			TransactionPayment::weight_to_fee(weight)
+		}
+		fn query_length_to_fee(length: u32) -> interface::Balance {
+			TransactionPayment::length_to_fee(length)
+		}
+	}
+
 	impl sp_genesis_builder::GenesisBuilder<Block> for Runtime {
 		fn build_state(config: Vec<u8>) -> sp_genesis_builder::Result {
 			build_state::<RuntimeGenesisConfig>(config)