Broker: sale price runtime api

cumulus/parachains/runtimes/coretime/coretime-rococo/Cargo.toml

@@ -32,6 +32,7 @@ pallet-authorship = { path = "../../../../../substrate/frame/authorship", defaul
 pallet-balances = { path = "../../../../../substrate/frame/balances", default-features = false }
 pallet-message-queue = { path = "../../../../../substrate/frame/message-queue", default-features = false }
 pallet-broker = { path = "../../../../../substrate/frame/broker", default-features = false }
+pallet-broker-runtime-api = { path = "../../../../../substrate/frame/broker/runtime-api", default-features = false }
 pallet-multisig = { path = "../../../../../substrate/frame/multisig", default-features = false }
 pallet-session = { path = "../../../../../substrate/frame/session", default-features = false }
 pallet-sudo = { path = "../../../../../substrate/frame/sudo", default-features = false }
@@ -101,6 +102,7 @@ std = [
 	"pallet-authorship/std",
 	"pallet-balances/std",
 	"pallet-broker/std",
+	"pallet-broker-runtime-api/std",
 	"pallet-collator-selection/std",
 	"pallet-message-queue/std",
 	"pallet-multisig/std",

cumulus/parachains/runtimes/coretime/coretime-rococo/src/lib.rs

@@ -595,6 +595,12 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl pallet_broker_runtime_api::BrokerApi<Block, Balance> for Runtime {
+		fn sale_price() -> Option<Balance> {
+			Broker::api_sale_price()
+		}
+	}
+
 	impl pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<Block, Balance> for Runtime {
 		fn query_info(
 			uxt: <Block as BlockT>::Extrinsic,

cumulus/parachains/runtimes/coretime/coretime-westend/Cargo.toml

@@ -32,6 +32,7 @@ pallet-authorship = { path = "../../../../../substrate/frame/authorship", defaul
 pallet-balances = { path = "../../../../../substrate/frame/balances", default-features = false }
 pallet-message-queue = { path = "../../../../../substrate/frame/message-queue", default-features = false }
 pallet-broker = { path = "../../../../../substrate/frame/broker", default-features = false }
+pallet-broker-runtime-api = { path = "../../../../../substrate/frame/broker/runtime-api", default-features = false }
 pallet-multisig = { path = "../../../../../substrate/frame/multisig", default-features = false }
 pallet-session = { path = "../../../../../substrate/frame/session", default-features = false }
 pallet-timestamp = { path = "../../../../../substrate/frame/timestamp", default-features = false }
@@ -100,6 +101,7 @@ std = [
 	"pallet-authorship/std",
 	"pallet-balances/std",
 	"pallet-broker/std",
+	"pallet-broker-runtime-api/std",
 	"pallet-collator-selection/std",
 	"pallet-message-queue/std",
 	"pallet-multisig/std",

cumulus/parachains/runtimes/coretime/coretime-westend/src/lib.rs

@@ -586,6 +586,12 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl pallet_broker_runtime_api::BrokerApi<Block, Balance> for Runtime {
+		fn sale_price() -> Option<Balance> {
+			Broker::api_sale_price()
+		}
+	}
+
 	impl pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<Block, Balance> for Runtime {
 		fn query_info(
 			uxt: <Block as BlockT>::Extrinsic,

substrate/frame/broker/runtime-api/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "pallet-broker-runtime-api"
+version = "14.0.0"
+authors.workspace = true
+edition.workspace = true
+license = "Apache-2.0"
+homepage = "https://substrate.io"
+repository.workspace = true
+description = "Runtime API for the FRAME Broker pallet."
+readme = "README.md"
+
+[lints]
+workspace = true
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+codec = { package = "parity-scale-codec", version = "3.6.1", default-features = false, features = ["derive"] }
+pallet-broker = { path = "..", default-features = false }
+sp-api = { path = "../../../primitives/api", default-features = false }
+sp-std = { path = "../../../primitives/std", default-features = false }
+
+[features]
+default = ["std"]
+std = ["codec/std", "pallet-broker/std", "sp-api/std", "sp-std/std"]

substrate/frame/broker/runtime-api/README.md

@@ -0,0 +1,3 @@
+RPC runtime API for the FRAME Broker pallet.
+
+License: Apache-2.0

substrate/frame/broker/runtime-api/src/lib.rs

@@ -0,0 +1,32 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Runtime API definition for the FRAME Broker pallet.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use codec::Codec;
+
+sp_api::decl_runtime_apis! {
+	pub trait BrokerApi<Balance>
+	where
+		Balance: Codec
+	{
+		/// If there is an ongoing sale returns the current price of a core.
+		fn sale_price() -> Option<Balance>;
+	}
+}

substrate/frame/broker/src/dispatchable_impls.rs

@@ -437,4 +437,21 @@ impl<T: Config> Pallet<T> {
 		Self::deposit_event(Event::AllowedRenewalDropped { core, when });
 		Ok(())
 	}
+
+	/// If there is a sale ongoing returns the current price of a core.
+	pub fn api_sale_price() -> Option<BalanceOf<T>> {
+		let Some(status) = Status::<T>::get() else {
+			return None;
+		};
+		let Some(sale) = SaleInfo::<T>::get() else {
+			return None;
+		};
+
+		if sale.first_core < status.core_count || sale.cores_sold < sale.cores_offered {
+			return None;
+		}
+		let now = frame_system::Pallet::<T>::block_number();
+		let price = Self::sale_price(&sale, now);
+		Some(price)
+	}
 }