feat/ocw/bookkeeping (#5200)

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

substrate/client/api/src/backend.rs

@@ -19,7 +19,7 @@
 use std::sync::Arc;
 use std::collections::HashMap;
 use sp_core::ChangesTrieConfigurationRange;
-use sp_core::offchain::OffchainStorage;
+use sp_core::offchain::{OffchainStorage,storage::OffchainOverlayedChanges};
 use sp_runtime::{generic::BlockId, Justification, Storage};
 use sp_runtime::traits::{Block as BlockT, NumberFor, HashFor};
 use sp_state_machine::{
@@ -148,6 +148,14 @@ pub trait BlockImportOperation<Block: BlockT> {
 		child_update: ChildStorageCollection,
 	) -> sp_blockchain::Result<()>;
 
+	/// Write offchain storage changes to the database.
+	fn update_offchain_storage(
+		&mut self,
+		_offchain_update: OffchainOverlayedChanges,
+	) -> sp_blockchain::Result<()> {
+		 Ok(())
+	}
+
 	/// Inject changes trie data into the database.
 	fn update_changes_trie(
 		&mut self,

substrate/client/api/src/call_executor.rs

@@ -26,7 +26,7 @@ use sp_state_machine::{
 };
 use sc_executor::{RuntimeVersion, NativeVersion};
 use sp_externalities::Extensions;
-use sp_core::NativeOrEncoded;
+use sp_core::{NativeOrEncoded,offchain::storage::OffchainOverlayedChanges};
 
 use sp_api::{ProofRecorder, InitializeBlock, StorageTransactionCache};
 use crate::execution_extensions::ExecutionExtensions;
@@ -84,6 +84,7 @@ pub trait CallExecutor<B: BlockT> {
 		method: &str,
 		call_data: &[u8],
 		changes: &RefCell<OverlayedChanges>,
+		offchain_changes: &RefCell<OffchainOverlayedChanges>,
 		storage_transaction_cache: Option<&RefCell<
 			StorageTransactionCache<B, <Self::Backend as crate::backend::Backend<B>>::State>,
 		>>,

substrate/client/api/src/execution_extensions.rs

@@ -177,7 +177,7 @@ impl<Block: traits::Block> ExecutionExtensions<Block> {
 		if let ExecutionContext::OffchainCall(Some(ext)) = context {
 			extensions.register(
 				OffchainExt::new(offchain::LimitedExternalities::new(capabilities, ext.0))
-			)
+			);
 		}
 
 		(manager, extensions)