extract message_details impl into runtime common (#1070)

bridges/bin/runtime-common/src/messages_api.rs

@@ -0,0 +1,52 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common 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.
+
+// Parity Bridges Common 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 Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Helpers for implementing various message-related runtime API mthods.
+
+use crate::messages::{source::FromThisChainMessagePayload, MessageBridge};
+
+use bp_messages::{LaneId, MessageDetails, MessageNonce};
+use codec::Decode;
+use frame_support::traits::Instance;
+use sp_std::vec::Vec;
+
+/// Implementation of the `To*OutboundLaneApi::message_details`.
+pub fn outbound_message_details<Runtime, MessagesPalletInstance, BridgeConfig>(
+	lane: LaneId,
+	begin: MessageNonce,
+	end: MessageNonce,
+) -> Vec<MessageDetails<Runtime::OutboundMessageFee>>
+where
+	Runtime: pallet_bridge_messages::Config<MessagesPalletInstance>,
+	MessagesPalletInstance: Instance,
+	BridgeConfig: MessageBridge,
+{
+	(begin..=end)
+		.filter_map(|nonce| {
+			let message_data =
+				pallet_bridge_messages::Pallet::<Runtime, MessagesPalletInstance>::outbound_message_data(lane, nonce)?;
+			let decoded_payload =
+				FromThisChainMessagePayload::<BridgeConfig>::decode(&mut &message_data.payload[..]).ok()?;
+			Some(MessageDetails {
+				nonce,
+				dispatch_weight: decoded_payload.weight,
+				size: message_data.payload.len() as _,
+				delivery_and_dispatch_fee: message_data.fee,
+				dispatch_fee_payment: decoded_payload.dispatch_fee_payment,
+			})
+		})
+		.collect()
+}