feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/client/network/light/src/light_client_requests.rs

@@ -0,0 +1,66 @@
+// This file is part of Substrate.
+
+// 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/>.
+
+//! Helpers for outgoing and incoming light client requests.
+
+use sc_network::{
+	config::ProtocolId, request_responses::IncomingRequest, NetworkBackend, MAX_RESPONSE_SIZE,
+};
+use sp_runtime::traits::Block;
+
+use std::time::Duration;
+
+/// For incoming light client requests.
+pub mod handler;
+
+/// Generate the light client protocol name from the genesis hash and fork id.
+fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
+	let genesis_hash = genesis_hash.as_ref();
+	if let Some(fork_id) = fork_id {
+		format!("/{}/{}/light/2", array_bytes::bytes2hex("", genesis_hash), fork_id)
+	} else {
+		format!("/{}/light/2", array_bytes::bytes2hex("", genesis_hash))
+	}
+}
+
+/// Generate the legacy light client protocol name from chain specific protocol identifier.
+fn generate_legacy_protocol_name(protocol_id: &ProtocolId) -> String {
+	format!("/{}/light/2", protocol_id.as_ref())
+}
+
+/// Generates a `RequestResponseProtocolConfig` for the light client request protocol, refusing
+/// incoming requests.
+pub fn generate_protocol_config<
+	Hash: AsRef<[u8]>,
+	B: Block,
+	N: NetworkBackend<B, <B as Block>::Hash>,
+>(
+	protocol_id: &ProtocolId,
+	genesis_hash: Hash,
+	fork_id: Option<&str>,
+	inbound_queue: async_channel::Sender<IncomingRequest>,
+) -> N::RequestResponseProtocolConfig {
+	N::request_response_config(
+		generate_protocol_name(genesis_hash, fork_id).into(),
+		std::iter::once(generate_legacy_protocol_name(protocol_id).into()).collect(),
+		1 * 1024 * 1024,
+		MAX_RESPONSE_SIZE,
+		Duration::from_secs(15),
+		Some(inbound_queue),
+	)
+}