orchestra license headers (#5588)

polkadot/node/orchestra/proc-macro/src/orchestra.rs

@@ -0,0 +1,66 @@
+// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use proc_macro2::TokenStream;
+use syn::{parse2, Result};
+
+use super::{parse::*, *};
+
+pub(crate) fn impl_orchestra_gen(
+	attr: TokenStream,
+	orig: TokenStream,
+) -> Result<proc_macro2::TokenStream> {
+	let args: OrchestraAttrArgs = parse2(attr)?;
+	let message_wrapper = args.message_wrapper;
+
+	let of: OrchestraGuts = parse2(orig)?;
+
+	let support_crate = support_crate().expect("The crate this macro is run for, includes the proc-macro support as dependency, otherwise it could not be run in the first place. qed");
+	let info = OrchestraInfo {
+		support_crate,
+		subsystems: of.subsystems,
+		baggage: of.baggage,
+		orchestra_name: of.name,
+		message_wrapper,
+		message_channel_capacity: args.message_channel_capacity,
+		signal_channel_capacity: args.signal_channel_capacity,
+		extern_event_ty: args.extern_event_ty,
+		extern_signal_ty: args.extern_signal_ty,
+		extern_error_ty: args.extern_error_ty,
+		outgoing_ty: args.outgoing_ty,
+	};
+
+	let mut additive = impl_orchestra_struct(&info);
+	additive.extend(impl_builder(&info));
+
+	additive.extend(impl_orchestrated_subsystem(&info));
+	additive.extend(impl_channels_out_struct(&info));
+	additive.extend(impl_subsystem_types_all(&info)?);
+
+	additive.extend(impl_message_wrapper_enum(&info)?);
+
+	let ts = expander::Expander::new("orchestra-expansion")
+		.add_comment("Generated orchestra code by `#[orchestra(..)]`".to_owned())
+		.dry(!cfg!(feature = "expand"))
+		.verbose(true)
+		// once all our needed format options are available on stable
+		// we should enabled this again, until then too many warnings
+		// are generated
+		// .fmt(expander::Edition::_2021)
+		.write_to_out_dir(additive)
+		.expect("Expander does not fail due to IO in OUT_DIR. qed");
+
+	Ok(ts)
+}