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/db/src/offchain.rs

@@ -0,0 +1,150 @@
+// 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/>.
+
+//! RocksDB-based offchain workers local storage.
+
+use std::{collections::HashMap, sync::Arc};
+
+use crate::{columns, Database, DbHash, Transaction};
+use log::error;
+use parking_lot::Mutex;
+
+/// Offchain local storage
+#[derive(Clone)]
+pub struct LocalStorage {
+	db: Arc<dyn Database<DbHash>>,
+	locks: Arc<Mutex<HashMap<Vec<u8>, Arc<Mutex<()>>>>>,
+}
+
+impl std::fmt::Debug for LocalStorage {
+	fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+		fmt.debug_struct("LocalStorage").finish()
+	}
+}
+
+impl LocalStorage {
+	/// Create new offchain storage for tests (backed by memorydb)
+	#[cfg(any(feature = "test-helpers", test))]
+	pub fn new_test() -> Self {
+		let db = kvdb_memorydb::create(crate::utils::NUM_COLUMNS);
+		let db = pezsp_database::as_database(db);
+		Self::new(db as _)
+	}
+
+	/// Create offchain local storage with given `KeyValueDB` backend.
+	pub fn new(db: Arc<dyn Database<DbHash>>) -> Self {
+		Self { db, locks: Default::default() }
+	}
+}
+
+impl pezsp_core::offchain::OffchainStorage for LocalStorage {
+	fn set(&mut self, prefix: &[u8], key: &[u8], value: &[u8]) {
+		let mut tx = Transaction::new();
+		tx.set(columns::OFFCHAIN, &concatenate_prefix_and_key(prefix, key), value);
+
+		if let Err(err) = self.db.commit(tx) {
+			error!("Error setting on local storage: {}", err)
+		}
+	}
+
+	fn remove(&mut self, prefix: &[u8], key: &[u8]) {
+		let mut tx = Transaction::new();
+		tx.remove(columns::OFFCHAIN, &concatenate_prefix_and_key(prefix, key));
+
+		if let Err(err) = self.db.commit(tx) {
+			error!("Error removing on local storage: {}", err)
+		}
+	}
+
+	fn get(&self, prefix: &[u8], key: &[u8]) -> Option<Vec<u8>> {
+		self.db.get(columns::OFFCHAIN, &concatenate_prefix_and_key(prefix, key))
+	}
+
+	fn compare_and_set(
+		&mut self,
+		prefix: &[u8],
+		item_key: &[u8],
+		old_value: Option<&[u8]>,
+		new_value: &[u8],
+	) -> bool {
+		let key = concatenate_prefix_and_key(prefix, item_key);
+		let key_lock = {
+			let mut locks = self.locks.lock();
+			locks.entry(key.clone()).or_default().clone()
+		};
+
+		let is_set;
+		{
+			let _key_guard = key_lock.lock();
+			let val = self.db.get(columns::OFFCHAIN, &key);
+			is_set = val.as_deref() == old_value;
+
+			if is_set {
+				self.set(prefix, item_key, new_value)
+			}
+		}
+
+		// clean the lock map if we're the only entry
+		let mut locks = self.locks.lock();
+		{
+			drop(key_lock);
+			let key_lock = locks.get_mut(&key);
+			if key_lock.and_then(Arc::get_mut).is_some() {
+				locks.remove(&key);
+			}
+		}
+		is_set
+	}
+}
+
+/// Concatenate the prefix and key to create an offchain key in the db.
+pub(crate) fn concatenate_prefix_and_key(prefix: &[u8], key: &[u8]) -> Vec<u8> {
+	prefix.iter().chain(key.iter()).cloned().collect()
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use pezsp_core::offchain::OffchainStorage;
+
+	#[test]
+	fn should_compare_and_set_and_clear_the_locks_map() {
+		let mut storage = LocalStorage::new_test();
+		let prefix = b"prefix";
+		let key = b"key";
+		let value = b"value";
+
+		storage.set(prefix, key, value);
+		assert_eq!(storage.get(prefix, key), Some(value.to_vec()));
+
+		assert_eq!(storage.compare_and_set(prefix, key, Some(value), b"asd"), true);
+		assert_eq!(storage.get(prefix, key), Some(b"asd".to_vec()));
+		assert!(storage.locks.lock().is_empty(), "Locks map should be empty!");
+	}
+
+	#[test]
+	fn should_compare_and_set_on_empty_field() {
+		let mut storage = LocalStorage::new_test();
+		let prefix = b"prefix";
+		let key = b"key";
+
+		assert_eq!(storage.compare_and_set(prefix, key, None, b"asd"), true);
+		assert_eq!(storage.get(prefix, key), Some(b"asd".to_vec()));
+		assert!(storage.locks.lock().is_empty(), "Locks map should be empty!");
+	}
+}