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1b5f4243d1
This PR removes sp-std crate from substrate/primitives sub-directories. For now crates that have `pub use` of sp-std or export macros that would necessitate users of the macros to `extern crate alloc` have been excluded from this PR. There should be no breaking changes in this PR. --------- Co-authored-by: Koute <koute@users.noreply.github.com>
124 lines
3.6 KiB
Rust
124 lines
3.6 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Substrate core types around sessions.
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#![cfg_attr(not(feature = "std"), no_std)]
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extern crate alloc;
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use codec::{Decode, Encode};
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#[cfg(feature = "std")]
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use sp_api::ProvideRuntimeApi;
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#[cfg(feature = "std")]
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use sp_runtime::traits::Block as BlockT;
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use alloc::vec::Vec;
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use sp_core::RuntimeDebug;
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use sp_staking::SessionIndex;
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pub mod runtime_api;
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pub use runtime_api::*;
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/// Number of validators in a given session.
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pub type ValidatorCount = u32;
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/// Proof of membership of a specific key in a given session.
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#[derive(Encode, Decode, Clone, Eq, PartialEq, Default, RuntimeDebug, scale_info::TypeInfo)]
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pub struct MembershipProof {
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/// The session index on which the specific key is a member.
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pub session: SessionIndex,
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/// Trie nodes of a merkle proof of session membership.
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pub trie_nodes: Vec<Vec<u8>>,
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/// The validator count of the session on which the specific key is a member.
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pub validator_count: ValidatorCount,
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}
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/// A utility trait to get a session number. This is implemented for
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/// `MembershipProof` below to fetch the session number the given session
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/// membership proof is for. It is useful when we need to deal with key owner
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/// proofs generically (i.e. just typing against the `KeyOwnerProofSystem`
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/// trait) but still restrict their capabilities.
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pub trait GetSessionNumber {
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fn session(&self) -> SessionIndex;
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}
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/// A utility trait to get the validator count of a given session. This is
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/// implemented for `MembershipProof` below and fetches the number of validators
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/// in the session the membership proof is for. It is useful when we need to
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/// deal with key owner proofs generically (i.e. just typing against the
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/// `KeyOwnerProofSystem` trait) but still restrict their capabilities.
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pub trait GetValidatorCount {
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fn validator_count(&self) -> ValidatorCount;
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}
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impl GetSessionNumber for sp_core::Void {
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fn session(&self) -> SessionIndex {
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Default::default()
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}
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}
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impl GetValidatorCount for sp_core::Void {
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fn validator_count(&self) -> ValidatorCount {
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Default::default()
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}
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}
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impl GetSessionNumber for MembershipProof {
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fn session(&self) -> SessionIndex {
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self.session
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}
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}
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impl GetValidatorCount for MembershipProof {
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fn validator_count(&self) -> ValidatorCount {
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self.validator_count
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}
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}
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/// Generate the initial session keys with the given seeds, at the given block and store them in
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/// the client's keystore.
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#[cfg(feature = "std")]
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pub fn generate_initial_session_keys<Block, T>(
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client: std::sync::Arc<T>,
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at: Block::Hash,
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seeds: Vec<String>,
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keystore: sp_keystore::KeystorePtr,
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) -> Result<(), sp_api::ApiError>
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where
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Block: BlockT,
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T: ProvideRuntimeApi<Block>,
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T::Api: SessionKeys<Block>,
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{
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use sp_api::ApiExt;
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if seeds.is_empty() {
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return Ok(())
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}
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let mut runtime_api = client.runtime_api();
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runtime_api.register_extension(sp_keystore::KeystoreExt::from(keystore));
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for seed in seeds {
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runtime_api.generate_session_keys(at, Some(seed.as_bytes().to_vec()))?;
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}
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Ok(())
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}
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