Add partial session support

src/frame/mod.rs

@@ -34,6 +34,7 @@ use sp_core::storage::StorageKey;
 
 pub mod balances;
 pub mod contracts;
+pub mod session;
 pub mod staking;
 pub mod system;
 

src/frame/session.rs

@@ -0,0 +1,60 @@
+// Copyright 2019-2020 Parity Technologies (UK) Ltd.
+// This file is part of substrate-subxt.
+//
+// subxt is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// subxt is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with substrate-subxt.  If not, see <http://www.gnu.org/licenses/>.
+// Copyright 2019-2020 Parity Technologies (UK) Ltd.
+
+//! Session support
+#![warn(missing_docs)] // yuck ☹
+use crate::frame::system::System;
+use codec::Encode;
+use frame_support::Parameter;
+use std::{fmt::Debug, marker::PhantomData};
+use substrate_subxt_proc_macro::Store;
+
+/// The trait needed for this module.
+pub trait Session: System {
+    /// The validator account identifier type for the runtime.
+    type ValidatorId: Parameter + Debug + Ord + Default;
+    /// The validator account identifier type for the runtime.
+    type SessionIndex: Parameter + Debug + Ord + Default;
+}
+
+const MODULE: &str = "Session";
+
+/// The current set of validators.
+#[derive(Encode, Store)]
+pub struct ValidatorsStore<T: Session> {
+    #[store(returns = Vec<<T as Session>::ValidatorId>)]
+    /// The current set of validators.
+    pub _runtime: PhantomData<T>,
+}
+
+/// Current index of the session.
+#[derive(Encode, Store)]
+pub struct CurrentIndexStore<T: Session> {
+    #[store(returns = <T as Session>::SessionIndex)]
+    /// Current index of the session.
+    pub _r: PhantomData<T>,
+}
+
+/// True if the underlying economic identities or weighting behind the validators
+/// has changed in the queued validator set.
+#[derive(Encode, Store)]
+pub struct QueuedChangedStore<T: Session> {
+    #[store(returns = bool)]
+    /// True if the underlying economic identities or weighting behind the validators
+    /// has changed in the queued validator set.
+    pub _r: PhantomData<T>,
+}