From 231acca72cb80f42f8cb510c9e3ab43e21205238 Mon Sep 17 00:00:00 2001
From: pgherveou <pgherveou@gmail.com>
Date: Fri, 23 Feb 2024 10:34:23 +0100
Subject: [PATCH] Fixes

---
 substrate/bin/node/runtime/src/lib.rs  |  1 +
 substrate/frame/contracts/src/lib.rs   | 19 +++++++++++++++++++
 substrate/frame/contracts/src/tests.rs |  1 +
 3 files changed, 21 insertions(+)

diff --git a/substrate/bin/node/runtime/src/lib.rs b/substrate/bin/node/runtime/src/lib.rs
index 24c8f6f48e96..b34d8c89e568 100644
--- a/substrate/bin/node/runtime/src/lib.rs
+++ b/substrate/bin/node/runtime/src/lib.rs
@@ -1367,6 +1367,7 @@ impl pallet_contracts::Config for Runtime {
 	type CodeHashLockupDepositPercent = CodeHashLockupDepositPercent;
 	type Debug = ();
 	type Environment = ();
+	type ApiVersion = ();
 	type Xcm = ();
 }
 
diff --git a/substrate/frame/contracts/src/lib.rs b/substrate/frame/contracts/src/lib.rs
index 533085f2b874..e16877d6880e 100644
--- a/substrate/frame/contracts/src/lib.rs
+++ b/substrate/frame/contracts/src/lib.rs
@@ -214,6 +214,19 @@ pub struct Environment<T: Config> {
 	block_number: EnvironmentType<BlockNumberFor<T>>,
 }
 
+/// Defines the current version of the HostFn APIs.
+/// This is used to communicate the available APIs in pallet-contracts.
+///
+/// The version is bumped any time a new HostFn is added or stabilized.
+#[derive(Encode, Decode, TypeInfo)]
+#[cfg_attr(feature = "std", derive(serde::Serialize, serde::Deserialize))]
+pub struct ApiVersion(u16);
+impl Default for ApiVersion {
+	fn default() -> Self {
+		Self(1)
+	}
+}
+
 #[frame_support::pallet]
 pub mod pallet {
 	use super::*;
@@ -402,6 +415,12 @@ pub mod pallet {
 		#[pallet::constant]
 		type Environment: Get<Environment<Self>>;
 
+		/// The version of the HostFn APIs that are available in the runtime.
+		///
+		/// Only valid value is `()`.
+		#[pallet::constant]
+		type ApiVersion: Get<ApiVersion>;
+
 		/// A type that exposes XCM APIs, allowing contracts to interact with other parachains, and
 		/// execute XCM programs.
 		type Xcm: xcm_builder::Controller<
diff --git a/substrate/frame/contracts/src/tests.rs b/substrate/frame/contracts/src/tests.rs
index a06b65b86b5a..0dce84bf9728 100644
--- a/substrate/frame/contracts/src/tests.rs
+++ b/substrate/frame/contracts/src/tests.rs
@@ -465,6 +465,7 @@ impl Config for Test {
 	type MaxDelegateDependencies = MaxDelegateDependencies;
 	type Debug = TestDebug;
 	type Environment = ();
+	type ApiVersion = ();
 	type Xcm = ();
 }