feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

bridges/snowbridge/primitives/outbound-queue/src/v2/exporter.rs

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use core::marker::PhantomData;
+use snowbridge_core::operating_mode::ExportPausedQuery;
+use sp_std::vec::Vec;
+use xcm::{
+	prelude::{Location, SendError, SendResult, SendXcm, Xcm, XcmHash},
+	VersionedLocation, VersionedXcm,
+};
+use xcm_builder::InspectMessageQueues;
+
+pub struct PausableExporter<PausedQuery, InnerExporter>(PhantomData<(PausedQuery, InnerExporter)>);
+
+impl<PausedQuery: ExportPausedQuery, InnerExporter: SendXcm> SendXcm
+	for PausableExporter<PausedQuery, InnerExporter>
+{
+	type Ticket = InnerExporter::Ticket;
+
+	fn validate(
+		destination: &mut Option<Location>,
+		message: &mut Option<Xcm<()>>,
+	) -> SendResult<Self::Ticket> {
+		match PausedQuery::is_paused() {
+			true => Err(SendError::NotApplicable),
+			false => InnerExporter::validate(destination, message),
+		}
+	}
+
+	fn deliver(ticket: Self::Ticket) -> Result<XcmHash, SendError> {
+		match PausedQuery::is_paused() {
+			true => Err(SendError::NotApplicable),
+			false => InnerExporter::deliver(ticket),
+		}
+	}
+}
+
+impl<Halted: ExportPausedQuery, InnerExporter: SendXcm> InspectMessageQueues
+	for PausableExporter<Halted, InnerExporter>
+{
+	fn clear_messages() {}
+
+	/// This router needs to implement `InspectMessageQueues` but doesn't have to
+	/// return any messages, since it just reuses the inner router.
+	fn get_messages() -> Vec<(VersionedLocation, Vec<VersionedXcm<()>>)> {
+		Vec::new()
+	}
+}