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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| use std::{ | ||
| fmt::{Display, Formatter}, | ||
| marker::PhantomData, | ||
| sync::Arc, | ||
| }; | ||
|
|
||
| use aleph_runtime::SessionKeys; | ||
| use parity_scale_codec::{Decode, DecodeAll, Error as DecodeError}; | ||
| use sc_client_api::Backend; | ||
| use sp_application_crypto::key_types::AURA; | ||
| use sp_core::twox_128; | ||
| use sp_runtime::traits::{Block, OpaqueKeys}; | ||
|
|
||
| use crate::{ | ||
| aleph_primitives::{AccountId, AlephSessionApi, AuraId}, | ||
| BlockHash, ClientForAleph, | ||
| }; | ||
|
|
||
| /// Trait handling connection between host code and runtime storage | ||
| pub trait RuntimeApi { | ||
| type Error: Display; | ||
| /// Returns aura authorities for the next session using state from block `at` | ||
| fn next_aura_authorities(&self, at: BlockHash) -> Result<Vec<AuraId>, Self::Error>; | ||
| } | ||
|
|
||
| type QueuedKeys = Vec<(AccountId, SessionKeys)>; | ||
|
|
||
| #[derive(Clone)] | ||
| pub struct RuntimeApiImpl<C, B, BE> | ||
| where | ||
| C: ClientForAleph<B, BE> + Send + Sync + 'static, | ||
| C::Api: AlephSessionApi<B>, | ||
| B: Block<Hash = BlockHash>, | ||
| BE: Backend<B> + 'static, | ||
| { | ||
| client: Arc<C>, | ||
| _phantom: PhantomData<(B, BE)>, | ||
| } | ||
|
|
||
| impl<C, B, BE> RuntimeApiImpl<C, B, BE> | ||
| where | ||
| C: ClientForAleph<B, BE> + Send + Sync + 'static, | ||
| C::Api: AlephSessionApi<B>, | ||
| B: Block<Hash = BlockHash>, | ||
| BE: Backend<B> + 'static, | ||
| { | ||
| pub fn new(client: Arc<C>) -> Self { | ||
| Self { | ||
| client, | ||
| _phantom: PhantomData, | ||
| } | ||
| } | ||
|
|
||
| fn read_storage<D: Decode>( | ||
| &self, | ||
| pallet: &str, | ||
| item: &str, | ||
| at_block: BlockHash, | ||
| ) -> Result<D, ApiError> { | ||
| let storage_key = [twox_128(pallet.as_bytes()), twox_128(item.as_bytes())].concat(); | ||
|
|
||
| let encoded = match self | ||
| .client | ||
| .storage(at_block, &sc_client_api::StorageKey(storage_key)) | ||
| { | ||
| Ok(Some(e)) => e, | ||
| _ => return Err(ApiError::NoStorage(pallet.to_string(), item.to_string())), | ||
| }; | ||
|
|
||
| D::decode_all(&mut encoded.0.as_ref()).map_err(ApiError::DecodeError) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone, Debug)] | ||
| pub enum ApiError { | ||
| NoStorage(String, String), | ||
| DecodeError(DecodeError), | ||
| } | ||
|
|
||
| impl Display for ApiError { | ||
| fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> { | ||
| match self { | ||
| ApiError::NoStorage(pallet, item) => write!(f, "no storage under {}.{}", pallet, item), | ||
| ApiError::DecodeError(error) => write!(f, "decode error: {:?}", error), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<C, B, BE> RuntimeApi for RuntimeApiImpl<C, B, BE> | ||
| where | ||
| C: ClientForAleph<B, BE> + Send + Sync + 'static, | ||
| C::Api: AlephSessionApi<B>, | ||
| B: Block<Hash = BlockHash>, | ||
| BE: Backend<B> + 'static, | ||
| { | ||
| type Error = ApiError; | ||
|
|
||
| fn next_aura_authorities(&self, at: BlockHash) -> Result<Vec<AuraId>, Self::Error> { | ||
| if let Ok(authorities) = self.client.runtime_api().next_session_aura_authorities(at) { | ||
| return Ok(authorities); | ||
| } | ||
|
|
||
| let queued_keys: QueuedKeys = self.read_storage("Session", "QueuedKeys", at)?; | ||
|
|
||
| Ok(queued_keys | ||
| .into_iter() | ||
| .filter_map(|(_, keys)| keys.get(AURA)) | ||
| .collect()) | ||
| } | ||
| } |
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