feat: Rebrand Polkadot/Substrate references to PezkuwiChain

This commit systematically rebrands various references from Parity Technologies'
Polkadot/Substrate ecosystem to PezkuwiChain within the kurdistan-sdk.

Key changes include:
- Updated external repository URLs (zombienet-sdk, parity-db, parity-scale-codec, wasm-instrument) to point to pezkuwichain forks.
- Modified internal documentation and code comments to reflect PezkuwiChain naming and structure.
- Replaced direct references to  with  or specific paths within the  for XCM, Pezkuwi, and other modules.
- Cleaned up deprecated  issue and PR references in various  and  files, particularly in  and  modules.
- Adjusted image and logo URLs in documentation to point to PezkuwiChain assets.
- Removed or rephrased comments related to external Polkadot/Substrate PRs and issues.

This is a significant step towards fully customizing the SDK for the PezkuwiChain ecosystem.

bizinikiwi/client/offchain/src/api.rs

@@ -0,0 +1,457 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program 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.
+
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+use std::{collections::HashSet, str::FromStr, sync::Arc, thread::sleep};
+
+use crate::NetworkProvider;
+use codec::{Decode, Encode};
+use futures::Future;
+pub use http::SharedClient;
+use pezsc_network::Multiaddr;
+use pezsc_network_types::PeerId;
+use pezsp_core::{
+	offchain::{
+		self, HttpError, HttpRequestId, HttpRequestStatus, OpaqueMultiaddr, OpaqueNetworkState,
+		Timestamp,
+	},
+	OpaquePeerId,
+};
+
+mod http;
+
+mod timestamp;
+
+/// Asynchronous offchain API.
+///
+/// NOTE this is done to prevent recursive calls into the runtime
+/// (which are not supported currently).
+pub(crate) struct Api {
+	/// A provider for bizinikiwi networking.
+	network_provider: Arc<dyn NetworkProvider + Send + Sync>,
+	/// Is this node a potential validator?
+	is_validator: bool,
+	/// Everything HTTP-related is handled by a different struct.
+	http: http::HttpApi,
+}
+
+impl offchain::Externalities for Api {
+	fn is_validator(&self) -> bool {
+		self.is_validator
+	}
+
+	fn network_state(&self) -> Result<OpaqueNetworkState, ()> {
+		let external_addresses = self.network_provider.external_addresses();
+
+		let state = NetworkState::new(self.network_provider.local_peer_id(), external_addresses);
+		Ok(OpaqueNetworkState::from(state))
+	}
+
+	fn timestamp(&mut self) -> Timestamp {
+		timestamp::now()
+	}
+
+	fn sleep_until(&mut self, deadline: Timestamp) {
+		sleep(timestamp::timestamp_from_now(deadline));
+	}
+
+	fn random_seed(&mut self) -> [u8; 32] {
+		rand::random()
+	}
+
+	fn http_request_start(
+		&mut self,
+		method: &str,
+		uri: &str,
+		_meta: &[u8],
+	) -> Result<HttpRequestId, ()> {
+		self.http.request_start(method, uri)
+	}
+
+	fn http_request_add_header(
+		&mut self,
+		request_id: HttpRequestId,
+		name: &str,
+		value: &str,
+	) -> Result<(), ()> {
+		self.http.request_add_header(request_id, name, value)
+	}
+
+	fn http_request_write_body(
+		&mut self,
+		request_id: HttpRequestId,
+		chunk: &[u8],
+		deadline: Option<Timestamp>,
+	) -> Result<(), HttpError> {
+		self.http.request_write_body(request_id, chunk, deadline)
+	}
+
+	fn http_response_wait(
+		&mut self,
+		ids: &[HttpRequestId],
+		deadline: Option<Timestamp>,
+	) -> Vec<HttpRequestStatus> {
+		self.http.response_wait(ids, deadline)
+	}
+
+	fn http_response_headers(&mut self, request_id: HttpRequestId) -> Vec<(Vec<u8>, Vec<u8>)> {
+		self.http.response_headers(request_id)
+	}
+
+	fn http_response_read_body(
+		&mut self,
+		request_id: HttpRequestId,
+		buffer: &mut [u8],
+		deadline: Option<Timestamp>,
+	) -> Result<usize, HttpError> {
+		self.http.response_read_body(request_id, buffer, deadline)
+	}
+
+	fn set_authorized_nodes(&mut self, nodes: Vec<OpaquePeerId>, authorized_only: bool) {
+		let peer_ids: HashSet<PeerId> =
+			nodes.into_iter().filter_map(|node| PeerId::from_bytes(&node.0).ok()).collect();
+
+		self.network_provider.set_authorized_peers(peer_ids);
+		self.network_provider.set_authorized_only(authorized_only);
+	}
+}
+
+/// Information about the local node's network state.
+#[derive(Clone, Eq, PartialEq, Debug)]
+pub struct NetworkState {
+	peer_id: PeerId,
+	external_addresses: Vec<Multiaddr>,
+}
+
+impl NetworkState {
+	fn new(peer_id: PeerId, external_addresses: Vec<Multiaddr>) -> Self {
+		NetworkState { peer_id, external_addresses }
+	}
+}
+
+impl From<NetworkState> for OpaqueNetworkState {
+	fn from(state: NetworkState) -> OpaqueNetworkState {
+		let enc = Encode::encode(&state.peer_id.to_bytes());
+		let peer_id = OpaquePeerId::new(enc);
+
+		let external_addresses: Vec<OpaqueMultiaddr> = state
+			.external_addresses
+			.iter()
+			.map(|multiaddr| {
+				let e = Encode::encode(&multiaddr.to_string());
+				OpaqueMultiaddr::new(e)
+			})
+			.collect();
+
+		OpaqueNetworkState { peer_id, external_addresses }
+	}
+}
+
+impl TryFrom<OpaqueNetworkState> for NetworkState {
+	type Error = ();
+
+	fn try_from(state: OpaqueNetworkState) -> Result<Self, Self::Error> {
+		let inner_vec = state.peer_id.0;
+
+		let bytes: Vec<u8> = Decode::decode(&mut &inner_vec[..]).map_err(|_| ())?;
+		let peer_id = PeerId::from_bytes(&bytes).map_err(|_| ())?;
+
+		let external_addresses: Result<Vec<Multiaddr>, Self::Error> = state
+			.external_addresses
+			.iter()
+			.map(|enc_multiaddr| -> Result<Multiaddr, Self::Error> {
+				let inner_vec = &enc_multiaddr.0;
+				let bytes = <Vec<u8>>::decode(&mut &inner_vec[..]).map_err(|_| ())?;
+				let multiaddr_str = String::from_utf8(bytes).map_err(|_| ())?;
+				let multiaddr = Multiaddr::from_str(&multiaddr_str).map_err(|_| ())?;
+				Ok(multiaddr)
+			})
+			.collect();
+		let external_addresses = external_addresses?;
+
+		Ok(NetworkState { peer_id, external_addresses })
+	}
+}
+
+/// Offchain extensions implementation API
+///
+/// This is the asynchronous processing part of the API.
+pub(crate) struct AsyncApi {
+	/// Everything HTTP-related is handled by a different struct.
+	http: Option<http::HttpWorker>,
+}
+
+impl AsyncApi {
+	/// Creates new Offchain extensions API implementation and the asynchronous processing part.
+	pub fn new(
+		network_provider: Arc<dyn NetworkProvider + Send + Sync>,
+		is_validator: bool,
+		shared_http_client: SharedClient,
+	) -> (Api, Self) {
+		let (http_api, http_worker) = http::http(shared_http_client);
+
+		let api = Api { network_provider, is_validator, http: http_api };
+
+		let async_api = Self { http: Some(http_worker) };
+
+		(api, async_api)
+	}
+
+	/// Run a processing task for the API
+	pub fn process(self) -> impl Future<Output = ()> {
+		self.http.expect("`process` is only called once; qed")
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use pezsc_client_db::offchain::LocalStorage;
+	use pezsc_network::{
+		config::MultiaddrWithPeerId, types::ProtocolName, NetworkPeers, NetworkStateInfo,
+		ObservedRole, ReputationChange,
+	};
+	use pezsp_core::offchain::{storage::OffchainDb, DbExternalities, Externalities, StorageKind};
+	use std::time::SystemTime;
+
+	pub(super) struct TestNetwork();
+
+	#[async_trait::async_trait]
+	impl NetworkPeers for TestNetwork {
+		fn set_authorized_peers(&self, _peers: HashSet<PeerId>) {
+			unimplemented!();
+		}
+
+		fn set_authorized_only(&self, _reserved_only: bool) {
+			unimplemented!();
+		}
+
+		fn add_known_address(&self, _peer_id: PeerId, _addr: Multiaddr) {
+			unimplemented!();
+		}
+
+		fn report_peer(&self, _peer_id: PeerId, _cost_benefit: ReputationChange) {
+			unimplemented!();
+		}
+
+		fn peer_reputation(&self, _peer_id: &PeerId) -> i32 {
+			unimplemented!()
+		}
+
+		fn disconnect_peer(&self, _peer_id: PeerId, _protocol: ProtocolName) {
+			unimplemented!();
+		}
+
+		fn accept_unreserved_peers(&self) {
+			unimplemented!();
+		}
+
+		fn deny_unreserved_peers(&self) {
+			unimplemented!();
+		}
+
+		fn add_reserved_peer(&self, _peer: MultiaddrWithPeerId) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn remove_reserved_peer(&self, _peer_id: PeerId) {
+			unimplemented!();
+		}
+
+		fn set_reserved_peers(
+			&self,
+			_protocol: ProtocolName,
+			_peers: HashSet<Multiaddr>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn add_peers_to_reserved_set(
+			&self,
+			_protocol: ProtocolName,
+			_peers: HashSet<Multiaddr>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn remove_peers_from_reserved_set(
+			&self,
+			_protocol: ProtocolName,
+			_peers: Vec<PeerId>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn sync_num_connected(&self) -> usize {
+			unimplemented!();
+		}
+
+		fn peer_role(&self, _peer_id: PeerId, _handshake: Vec<u8>) -> Option<ObservedRole> {
+			None
+		}
+
+		async fn reserved_peers(&self) -> Result<Vec<PeerId>, ()> {
+			unimplemented!();
+		}
+	}
+
+	impl NetworkStateInfo for TestNetwork {
+		fn external_addresses(&self) -> Vec<Multiaddr> {
+			Vec::new()
+		}
+
+		fn local_peer_id(&self) -> PeerId {
+			PeerId::random()
+		}
+
+		fn listen_addresses(&self) -> Vec<Multiaddr> {
+			Vec::new()
+		}
+	}
+
+	fn offchain_api() -> (Api, AsyncApi) {
+		pezsp_tracing::try_init_simple();
+		let mock = Arc::new(TestNetwork());
+		let shared_client = SharedClient::new().unwrap();
+
+		AsyncApi::new(mock, false, shared_client)
+	}
+
+	fn offchain_db() -> OffchainDb<LocalStorage> {
+		OffchainDb::new(LocalStorage::new_test())
+	}
+
+	#[test]
+	fn should_get_timestamp() {
+		let mut api = offchain_api().0;
+
+		// Get timestamp from std.
+		let now = SystemTime::now();
+		let d: u64 = now
+			.duration_since(SystemTime::UNIX_EPOCH)
+			.unwrap()
+			.as_millis()
+			.try_into()
+			.unwrap();
+
+		// Get timestamp from offchain api.
+		let timestamp = api.timestamp();
+
+		// Compare.
+		assert!(timestamp.unix_millis() > 0);
+		assert!(timestamp.unix_millis() >= d);
+	}
+
+	#[test]
+	fn should_sleep() {
+		let mut api = offchain_api().0;
+
+		// Arrange.
+		let now = api.timestamp();
+		let delta = pezsp_core::offchain::Duration::from_millis(100);
+		let deadline = now.add(delta);
+
+		// Act.
+		api.sleep_until(deadline);
+		let new_now = api.timestamp();
+
+		// Assert.
+		// The diff could be more than the sleep duration.
+		assert!(new_now.unix_millis() - 100 >= now.unix_millis());
+	}
+
+	#[test]
+	fn should_set_get_and_clear_local_storage() {
+		// given
+		let kind = StorageKind::PERSISTENT;
+		let mut api = offchain_db();
+		let key = b"test";
+
+		// when
+		assert_eq!(api.local_storage_get(kind, key), None);
+		api.local_storage_set(kind, key, b"value");
+
+		// then
+		assert_eq!(api.local_storage_get(kind, key), Some(b"value".to_vec()));
+
+		// when
+		api.local_storage_clear(kind, key);
+
+		// then
+		assert_eq!(api.local_storage_get(kind, key), None);
+	}
+
+	#[test]
+	fn should_compare_and_set_local_storage() {
+		// given
+		let kind = StorageKind::PERSISTENT;
+		let mut api = offchain_db();
+		let key = b"test";
+		api.local_storage_set(kind, key, b"value");
+
+		// when
+		assert_eq!(api.local_storage_compare_and_set(kind, key, Some(b"val"), b"xxx"), false);
+		assert_eq!(api.local_storage_get(kind, key), Some(b"value".to_vec()));
+
+		// when
+		assert_eq!(api.local_storage_compare_and_set(kind, key, Some(b"value"), b"xxx"), true);
+		assert_eq!(api.local_storage_get(kind, key), Some(b"xxx".to_vec()));
+	}
+
+	#[test]
+	fn should_compare_and_set_local_storage_with_none() {
+		// given
+		let kind = StorageKind::PERSISTENT;
+		let mut api = offchain_db();
+		let key = b"test";
+
+		// when
+		let res = api.local_storage_compare_and_set(kind, key, None, b"value");
+
+		// then
+		assert_eq!(res, true);
+		assert_eq!(api.local_storage_get(kind, key), Some(b"value".to_vec()));
+	}
+
+	#[test]
+	fn should_convert_network_states() {
+		// given
+		let state = NetworkState::new(
+			PeerId::random(),
+			vec![
+				Multiaddr::try_from("/ip4/127.0.0.1/tcp/1234".to_string()).unwrap(),
+				Multiaddr::try_from("/ip6/2601:9:4f81:9700:803e:ca65:66e8:c21").unwrap(),
+			],
+		);
+
+		// when
+		let opaque_state = OpaqueNetworkState::from(state.clone());
+		let converted_back_state = NetworkState::try_from(opaque_state).unwrap();
+
+		// then
+		assert_eq!(state, converted_back_state);
+	}
+
+	#[test]
+	fn should_get_random_seed() {
+		// given
+		let mut api = offchain_api().0;
+		let seed = api.random_seed();
+		// then
+		assert_ne!(seed, [0; 32]);
+	}
+}

bizinikiwi/client/offchain/src/api/timestamp.rs

@@ -0,0 +1,67 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program 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.
+
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+//! Helper methods dedicated to timestamps.
+
+use pezsp_core::offchain::Timestamp;
+use std::time::{Duration, SystemTime};
+
+/// Returns the current time as a `Timestamp`.
+pub fn now() -> Timestamp {
+	let now = SystemTime::now();
+	let epoch_duration = now.duration_since(SystemTime::UNIX_EPOCH);
+	match epoch_duration {
+		Err(_) => {
+			// Current time is earlier than UNIX_EPOCH.
+			Timestamp::from_unix_millis(0)
+		},
+		Ok(d) => {
+			let duration = d.as_millis();
+			// Assuming overflow won't happen for a few hundred years.
+			Timestamp::from_unix_millis(
+				duration
+					.try_into()
+					.expect("epoch milliseconds won't overflow u64 for hundreds of years; qed"),
+			)
+		},
+	}
+}
+
+/// Returns how a `Timestamp` compares to "now".
+///
+/// In other words, returns `timestamp - now()`.
+pub fn timestamp_from_now(timestamp: Timestamp) -> Duration {
+	Duration::from_millis(timestamp.diff(&now()).millis())
+}
+
+/// Converts the deadline into a `Future` that resolves when the deadline is reached.
+///
+/// If `None`, returns a never-ending `Future`.
+pub fn deadline_to_future(
+	deadline: Option<Timestamp>,
+) -> futures::future::MaybeDone<impl futures::Future<Output = ()>> {
+	use futures::future::{self, Either};
+
+	future::maybe_done(match deadline.map(timestamp_from_now) {
+		None => Either::Left(future::pending()),
+		// Only apply delay if we need to wait a non-zero duration
+		Some(duration) if duration <= Duration::from_secs(0) =>
+			Either::Right(Either::Left(future::ready(()))),
+		Some(duration) => Either::Right(Either::Right(futures_timer::Delay::new(duration))),
+	})
+}

bizinikiwi/client/offchain/src/lib.rs

@@ -0,0 +1,521 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program 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.
+
+// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+//! Bizinikiwi offchain workers.
+//!
+//! The offchain workers is a special function of the runtime that
+//! gets executed after block is imported. During execution
+//! it's able to asynchronously submit extrinsics that will either
+//! be propagated to other nodes or added to the next block
+//! produced by the node as unsigned transactions.
+//!
+//! Offchain workers can be used for computation-heavy tasks
+//! that are not feasible for execution during regular block processing.
+//! It can either be tasks that no consensus is required for,
+//! or some form of consensus over the data can be built on-chain
+//! for instance via:
+//! 1. Challenge period for incorrect computations
+//! 2. Majority voting for results
+//! 3. etc
+
+#![warn(missing_docs)]
+
+use std::{fmt, sync::Arc};
+
+use futures::{
+	future::{ready, Future},
+	prelude::*,
+};
+use parking_lot::Mutex;
+use pezsc_client_api::BlockchainEvents;
+use pezsc_network::{NetworkPeers, NetworkStateInfo};
+use pezsc_transaction_pool_api::OffchainTransactionPoolFactory;
+use pezsp_api::{ApiExt, ProvideRuntimeApi};
+use pezsp_core::{offchain, traits::SpawnNamed};
+use pezsp_externalities::Extension;
+use pezsp_keystore::{KeystoreExt, KeystorePtr};
+use pezsp_runtime::traits::{self, Header};
+use threadpool::ThreadPool;
+
+mod api;
+
+pub use pezsp_core::offchain::storage::OffchainDb;
+pub use pezsp_offchain::{OffchainWorkerApi, STORAGE_PREFIX};
+
+const LOG_TARGET: &str = "offchain-worker";
+
+/// NetworkProvider provides [`OffchainWorkers`] with all necessary hooks into the
+/// underlying Bizinikiwi networking.
+pub trait NetworkProvider: NetworkStateInfo + NetworkPeers {}
+
+impl<T> NetworkProvider for T where T: NetworkStateInfo + NetworkPeers {}
+
+/// Special type that implements [`OffchainStorage`](offchain::OffchainStorage).
+///
+/// This type can not be constructed and should only be used when passing `None` as `offchain_db` to
+/// [`OffchainWorkerOptions`] to make the compiler happy.
+#[derive(Clone)]
+pub enum NoOffchainStorage {}
+
+impl offchain::OffchainStorage for NoOffchainStorage {
+	fn set(&mut self, _: &[u8], _: &[u8], _: &[u8]) {
+		unimplemented!("`NoOffchainStorage` can not be constructed!")
+	}
+
+	fn remove(&mut self, _: &[u8], _: &[u8]) {
+		unimplemented!("`NoOffchainStorage` can not be constructed!")
+	}
+
+	fn get(&self, _: &[u8], _: &[u8]) -> Option<Vec<u8>> {
+		unimplemented!("`NoOffchainStorage` can not be constructed!")
+	}
+
+	fn compare_and_set(&mut self, _: &[u8], _: &[u8], _: Option<&[u8]>, _: &[u8]) -> bool {
+		unimplemented!("`NoOffchainStorage` can not be constructed!")
+	}
+}
+
+/// Options for [`OffchainWorkers`]
+pub struct OffchainWorkerOptions<RA, Block: traits::Block, Storage, CE> {
+	/// Provides access to the runtime api.
+	pub runtime_api_provider: Arc<RA>,
+	/// Provides access to the keystore.
+	pub keystore: Option<KeystorePtr>,
+	/// Provides access to the offchain database.
+	///
+	/// Use [`NoOffchainStorage`] as type when passing `None` to have some type that works.
+	pub offchain_db: Option<Storage>,
+	/// Provides access to the transaction pool.
+	pub transaction_pool: Option<OffchainTransactionPoolFactory<Block>>,
+	/// Provides access to network information.
+	pub network_provider: Arc<dyn NetworkProvider + Send + Sync>,
+	/// Is the node running as validator?
+	pub is_validator: bool,
+	/// Enable http requests from offchain workers?
+	///
+	/// If not enabled, any http request will panic.
+	pub enable_http_requests: bool,
+	/// Callback to create custom [`Extension`]s that should be registered for the
+	/// `offchain_worker` runtime call.
+	///
+	/// These [`Extension`]s are registered along-side the default extensions and are accessible in
+	/// the host functions.
+	///
+	/// # Example:
+	///
+	/// ```nocompile
+	/// custom_extensions: |block_hash| {
+	///     vec![MyCustomExtension::new()]
+	/// }
+	/// ```
+	pub custom_extensions: CE,
+}
+
+/// An offchain workers manager.
+pub struct OffchainWorkers<RA, Block: traits::Block, Storage> {
+	runtime_api_provider: Arc<RA>,
+	thread_pool: Mutex<ThreadPool>,
+	shared_http_client: api::SharedClient,
+	enable_http_requests: bool,
+	keystore: Option<KeystorePtr>,
+	offchain_db: Option<OffchainDb<Storage>>,
+	transaction_pool: Option<OffchainTransactionPoolFactory<Block>>,
+	network_provider: Arc<dyn NetworkProvider + Send + Sync>,
+	is_validator: bool,
+	custom_extensions: Box<dyn Fn(Block::Hash) -> Vec<Box<dyn Extension>> + Send>,
+}
+
+impl<RA, Block: traits::Block, Storage> OffchainWorkers<RA, Block, Storage> {
+	/// Creates new [`OffchainWorkers`].
+	pub fn new<CE: Fn(Block::Hash) -> Vec<Box<dyn Extension>> + Send + 'static>(
+		OffchainWorkerOptions {
+			runtime_api_provider,
+			keystore,
+			offchain_db,
+			transaction_pool,
+			network_provider,
+			is_validator,
+			enable_http_requests,
+			custom_extensions,
+		}: OffchainWorkerOptions<RA, Block, Storage, CE>,
+	) -> std::io::Result<Self> {
+		Ok(Self {
+			runtime_api_provider,
+			thread_pool: Mutex::new(ThreadPool::with_name(
+				"offchain-worker".into(),
+				num_cpus::get(),
+			)),
+			shared_http_client: api::SharedClient::new()?,
+			enable_http_requests,
+			keystore,
+			offchain_db: offchain_db.map(OffchainDb::new),
+			transaction_pool,
+			is_validator,
+			network_provider,
+			custom_extensions: Box::new(custom_extensions),
+		})
+	}
+}
+
+impl<RA, Block: traits::Block, Storage: offchain::OffchainStorage> fmt::Debug
+	for OffchainWorkers<RA, Block, Storage>
+{
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		f.debug_tuple("OffchainWorkers").finish()
+	}
+}
+
+impl<RA, Block, Storage> OffchainWorkers<RA, Block, Storage>
+where
+	Block: traits::Block,
+	RA: ProvideRuntimeApi<Block> + Send + Sync + 'static,
+	RA::Api: OffchainWorkerApi<Block>,
+	Storage: offchain::OffchainStorage + 'static,
+{
+	/// Run the offchain workers on every block import.
+	pub async fn run<BE: BlockchainEvents<Block>>(
+		self,
+		import_events: Arc<BE>,
+		spawner: impl SpawnNamed,
+	) {
+		import_events
+			.import_notification_stream()
+			.for_each(move |n| {
+				if n.is_new_best {
+					spawner.spawn(
+						"offchain-on-block",
+						Some("offchain-worker"),
+						self.on_block_imported(&n.header).boxed(),
+					);
+				} else {
+					tracing::debug!(
+						target: LOG_TARGET,
+						"Skipping offchain workers for non-canon block: {:?}",
+						n.header,
+					)
+				}
+
+				ready(())
+			})
+			.await;
+	}
+
+	/// Start the offchain workers after given block.
+	#[must_use]
+	fn on_block_imported(&self, header: &Block::Header) -> impl Future<Output = ()> {
+		let runtime = self.runtime_api_provider.runtime_api();
+		let hash = header.hash();
+		let has_api_v1 = runtime.has_api_with::<dyn OffchainWorkerApi<Block>, _>(hash, |v| v == 1);
+		let has_api_v2 = runtime.has_api_with::<dyn OffchainWorkerApi<Block>, _>(hash, |v| v == 2);
+		let version = match (has_api_v1, has_api_v2) {
+			(_, Ok(true)) => 2,
+			(Ok(true), _) => 1,
+			err => {
+				let help =
+					"Consider turning off offchain workers if they are not part of your runtime.";
+				tracing::error!(
+					target: LOG_TARGET,
+					"Unsupported Offchain Worker API version: {:?}. {}.",
+					err,
+					help
+				);
+				0
+			},
+		};
+		tracing::debug!(
+			target: LOG_TARGET,
+			"Checking offchain workers at {hash:?}: version: {version}",
+		);
+
+		let process = (version > 0).then(|| {
+			let (api, runner) = api::AsyncApi::new(
+				self.network_provider.clone(),
+				self.is_validator,
+				self.shared_http_client.clone(),
+			);
+			tracing::debug!(target: LOG_TARGET, "Spawning offchain workers at {hash:?}");
+			let header = header.clone();
+			let client = self.runtime_api_provider.clone();
+
+			let mut capabilities = offchain::Capabilities::all();
+			capabilities.set(offchain::Capabilities::HTTP, self.enable_http_requests);
+
+			let keystore = self.keystore.clone();
+			let db = self.offchain_db.clone();
+			let tx_pool = self.transaction_pool.clone();
+			let custom_extensions = (*self.custom_extensions)(hash);
+
+			self.spawn_worker(move || {
+				let mut runtime = client.runtime_api();
+				let api = Box::new(api);
+				tracing::debug!(target: LOG_TARGET, "Running offchain workers at {hash:?}");
+
+				if let Some(keystore) = keystore {
+					runtime.register_extension(KeystoreExt(keystore.clone()));
+				}
+
+				if let Some(pool) = tx_pool {
+					runtime.register_extension(pool.offchain_transaction_pool(hash));
+				}
+
+				if let Some(offchain_db) = db {
+					runtime.register_extension(offchain::OffchainDbExt::new(
+						offchain::LimitedExternalities::new(capabilities, offchain_db.clone()),
+					));
+				}
+
+				runtime.register_extension(offchain::OffchainWorkerExt::new(
+					offchain::LimitedExternalities::new(capabilities, api),
+				));
+
+				custom_extensions.into_iter().for_each(|ext| runtime.register_extension(ext));
+
+				let run = if version == 2 {
+					runtime.offchain_worker(hash, &header)
+				} else {
+					#[allow(deprecated)]
+					runtime.offchain_worker_before_version_2(hash, *header.number())
+				};
+
+				if let Err(e) = run {
+					tracing::error!(
+						target: LOG_TARGET,
+						"Error running offchain workers at {:?}: {}",
+						hash,
+						e
+					);
+				}
+			});
+
+			runner.process()
+		});
+
+		async move {
+			futures::future::OptionFuture::from(process).await;
+		}
+	}
+
+	/// Spawns a new offchain worker.
+	///
+	/// We spawn offchain workers for each block in a separate thread,
+	/// since they can run for a significant amount of time
+	/// in a blocking fashion and we don't want to block the runtime.
+	///
+	/// Note that we should avoid that if we switch to future-based runtime in the future,
+	/// alternatively:
+	fn spawn_worker(&self, f: impl FnOnce() -> () + Send + 'static) {
+		self.thread_pool.lock().execute(f);
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use futures::executor::block_on;
+	use pezsc_block_builder::BlockBuilderBuilder;
+	use pezsc_client_api::Backend as _;
+	use pezsc_network::{
+		config::MultiaddrWithPeerId, types::ProtocolName, Multiaddr, ObservedRole, ReputationChange,
+	};
+	use pezsc_network_types::PeerId;
+	use pezsc_transaction_pool::BasicPool;
+	use pezsc_transaction_pool_api::{InPoolTransaction, TransactionPool};
+	use pezsp_consensus::BlockOrigin;
+	use pezsp_runtime::traits::Block as BlockT;
+	use std::{collections::HashSet, sync::Arc};
+	use bizinikiwi_test_runtime_client::{
+		runtime::{
+			bizinikiwi_test_pallet::pallet::Call as PalletCall, ExtrinsicBuilder, RuntimeCall,
+		},
+		ClientBlockImportExt, DefaultTestClientBuilderExt, TestClientBuilderExt,
+	};
+
+	struct TestNetwork();
+
+	impl NetworkStateInfo for TestNetwork {
+		fn external_addresses(&self) -> Vec<Multiaddr> {
+			Vec::new()
+		}
+
+		fn local_peer_id(&self) -> PeerId {
+			PeerId::random()
+		}
+
+		fn listen_addresses(&self) -> Vec<Multiaddr> {
+			Vec::new()
+		}
+	}
+
+	#[async_trait::async_trait]
+	impl NetworkPeers for TestNetwork {
+		fn set_authorized_peers(&self, _peers: HashSet<PeerId>) {
+			unimplemented!();
+		}
+
+		fn set_authorized_only(&self, _reserved_only: bool) {
+			unimplemented!();
+		}
+
+		fn add_known_address(&self, _peer_id: PeerId, _addr: Multiaddr) {
+			unimplemented!();
+		}
+
+		fn report_peer(&self, _peer_id: PeerId, _cost_benefit: ReputationChange) {
+			unimplemented!();
+		}
+
+		fn peer_reputation(&self, _peer_id: &PeerId) -> i32 {
+			unimplemented!()
+		}
+
+		fn disconnect_peer(&self, _peer_id: PeerId, _protocol: ProtocolName) {
+			unimplemented!();
+		}
+
+		fn accept_unreserved_peers(&self) {
+			unimplemented!();
+		}
+
+		fn deny_unreserved_peers(&self) {
+			unimplemented!();
+		}
+
+		fn add_reserved_peer(&self, _peer: MultiaddrWithPeerId) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn remove_reserved_peer(&self, _peer_id: PeerId) {
+			unimplemented!();
+		}
+
+		fn set_reserved_peers(
+			&self,
+			_protocol: ProtocolName,
+			_peers: HashSet<Multiaddr>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn add_peers_to_reserved_set(
+			&self,
+			_protocol: ProtocolName,
+			_peers: HashSet<Multiaddr>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn remove_peers_from_reserved_set(
+			&self,
+			_protocol: ProtocolName,
+			_peers: Vec<PeerId>,
+		) -> Result<(), String> {
+			unimplemented!();
+		}
+
+		fn sync_num_connected(&self) -> usize {
+			unimplemented!();
+		}
+
+		fn peer_role(&self, _peer_id: PeerId, _handshake: Vec<u8>) -> Option<ObservedRole> {
+			None
+		}
+
+		async fn reserved_peers(&self) -> Result<Vec<PeerId>, ()> {
+			unimplemented!();
+		}
+	}
+
+	#[test]
+	fn should_call_into_runtime_and_produce_extrinsic() {
+		pezsp_tracing::try_init_simple();
+
+		let client = Arc::new(bizinikiwi_test_runtime_client::new());
+		let spawner = pezsp_core::testing::TaskExecutor::new();
+		let pool = Arc::from(BasicPool::new_full(
+			Default::default(),
+			true.into(),
+			None,
+			spawner,
+			client.clone(),
+		));
+		let network = Arc::new(TestNetwork());
+		let header = client.header(client.chain_info().genesis_hash).unwrap().unwrap();
+
+		// when
+		let offchain = OffchainWorkers::new(OffchainWorkerOptions {
+			runtime_api_provider: client,
+			keystore: None,
+			offchain_db: None::<NoOffchainStorage>,
+			transaction_pool: Some(OffchainTransactionPoolFactory::new(pool.clone())),
+			network_provider: network,
+			is_validator: false,
+			enable_http_requests: false,
+			custom_extensions: |_| Vec::new(),
+		})
+		.unwrap();
+		futures::executor::block_on(offchain.on_block_imported(&header));
+
+		// then
+		assert_eq!(pool.status().ready, 1);
+		assert!(matches!(
+			pool.ready().next().unwrap().data().function,
+			RuntimeCall::BizinikiwiTest(PalletCall::storage_change { .. })
+		));
+	}
+
+	#[test]
+	fn offchain_index_set_and_clear_works() {
+		use pezsp_core::offchain::OffchainStorage;
+
+		pezsp_tracing::try_init_simple();
+
+		let (client, backend) = bizinikiwi_test_runtime_client::TestClientBuilder::new()
+			.enable_offchain_indexing_api()
+			.build_with_backend();
+		let client = Arc::new(client);
+		let offchain_db = backend.offchain_storage().unwrap();
+
+		let key = &b"hello"[..];
+		let value = &b"world"[..];
+		let mut block_builder = BlockBuilderBuilder::new(&*client)
+			.on_parent_block(client.chain_info().genesis_hash)
+			.with_parent_block_number(0)
+			.build()
+			.unwrap();
+		let ext = ExtrinsicBuilder::new_offchain_index_set(key.to_vec(), value.to_vec()).build();
+		block_builder.push(ext).unwrap();
+
+		let block = block_builder.build().unwrap().block;
+		block_on(client.import(BlockOrigin::Own, block.clone())).unwrap();
+
+		assert_eq!(value, &offchain_db.get(pezsp_offchain::STORAGE_PREFIX, &key).unwrap());
+
+		let mut block_builder = BlockBuilderBuilder::new(&*client)
+			.on_parent_block(block.hash())
+			.with_parent_block_number(1)
+			.build()
+			.unwrap();
+		let ext = ExtrinsicBuilder::new_offchain_index_clear(key.to_vec()).nonce(1).build();
+		block_builder.push(ext).unwrap();
+
+		let block = block_builder.build().unwrap().block;
+		block_on(client.import(BlockOrigin::Own, block)).unwrap();
+
+		assert!(offchain_db.get(pezsp_offchain::STORAGE_PREFIX, &key).is_none());
+	}
+}