Add session weight (#477)

* session weight

* decouple session benchmarking and collator selection

* removed mock

* licensing

* benchmarking script

* set benchmarking into runtime

* Update scripts/benchmarks.sh

* real weights

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

pallets/session-benchmarking/src/lib.rs

@@ -0,0 +1,51 @@
+// Copyright (C) 2021 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.
+
+//! Benchmarking setup for pallet-session
+#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg(feature = "runtime-benchmarks")]
+use sp_std::prelude::*;
+use sp_std::vec;
+
+use frame_benchmarking::{benchmarks, impl_benchmark_test_suite, whitelisted_caller};
+use frame_system::{RawOrigin};
+use pallet_session::*;
+pub struct Pallet<T: Config>(pallet_session::Pallet<T>);
+pub trait Config: pallet_session::Config {}
+
+
+benchmarks! {
+	set_keys {
+		let caller: T::AccountId = whitelisted_caller();
+		frame_system::Pallet::<T>::inc_providers(&caller);
+		let keys = T::Keys::default();
+		let proof: Vec<u8> = vec![0,1,2,3];
+	}: _(RawOrigin::Signed(caller), keys, proof)
+
+	purge_keys {
+		let caller: T::AccountId = whitelisted_caller();
+		frame_system::Pallet::<T>::inc_providers(&caller);
+		let keys = T::Keys::default();
+		let proof: Vec<u8> = vec![0,1,2,3];
+		let _t = pallet_session::Pallet::<T>::set_keys(RawOrigin::Signed(caller.clone()).into(), keys, proof);
+	}: _(RawOrigin::Signed(caller))
+
+}
+impl_benchmark_test_suite!(
+	Pallet,
+	crate::mock::new_test_ext(),
+	crate::mock::Test,
+	extra = false,
+);