Phase out log_error macro

In general, we would like to let the sender of an `xtra::Message` to
be able to handle all the possible errors. The `log_error` macro
catered to the complete opposite use case, so we remove it.

In order to make error handling at the sending site more ergonomic, we
introduce a `LogFailure` trait designed for fallible `xtra::Messages`.

With this patch we've tried to change _where_ we handle errors, but
not _what_ we do with them.

daemon/src/actors.rs

@@ -1,9 +0,0 @@
-/// Wrapper for handlers to log errors
-#[macro_export]
-macro_rules! log_error {
-    ($future:expr) => {
-        if let Err(e) = $future.await {
-            tracing::error!("Message handler failed: {:#}", e);
-        }
-    };
-}

daemon/src/collab_settlement_maker.rs

@@ -9,6 +9,7 @@ use crate::model::cfd::SettlementKind;
 use crate::model::cfd::SettlementProposal;
 use crate::model::Identity;
 use crate::projection;
+use crate::xtra_ext::LogFailure;
 use anyhow::Context;
 use async_trait::async_trait;
 use bdk::bitcoin::Script;
@@ -172,7 +173,11 @@ impl Actor {
     }
 
     async fn complete(&mut self, completed: Completed, ctx: &mut xtra::Context<Self>) {
-        let _ = self.on_completed.send(completed).await;
+        let _ = self
+            .on_completed
+            .send(completed)
+            .log_failure("Failed to inform about collab settlement completion")
+            .await;
 
         ctx.stop();
     }

daemon/src/connection.rs

@@ -1,7 +1,6 @@
 use crate::address_map::AddressMap;
 use crate::address_map::Stopping;
 use crate::collab_settlement_taker;
-use crate::log_error;
 use crate::model::cfd::OrderId;
 use crate::model::Identity;
 use crate::model::Price;
@@ -17,6 +16,7 @@ use crate::wire;
 use crate::wire::EncryptedJsonCodec;
 use crate::wire::TakerToMaker;
 use crate::wire::Version;
+use crate::xtra_ext::LogFailure;
 use crate::Tasks;
 use anyhow::bail;
 use anyhow::Context;
@@ -146,7 +146,10 @@ impl Actor {
 #[xtra_productivity(message_impl = false)]
 impl Actor {
     async fn handle_taker_to_maker(&mut self, message: wire::TakerToMaker) {
-        log_error!(self.send_to_maker.send(message));
+        let msg_str = message.to_string();
+        if self.send_to_maker.send(message).await.is_err() {
+            tracing::warn!("Failed to send wire message {} to maker", msg_str);
+        }
     }
 
     async fn handle_collab_settlement_actor_stopping(
@@ -430,7 +433,11 @@ impl Actor {
                 }
             }
             wire::MakerToTaker::CurrentOrder(msg) => {
-                log_error!(self.current_order.send(CurrentOrder(msg)));
+                let _ = self
+                    .current_order
+                    .send(CurrentOrder(msg))
+                    .log_failure("Failed to forward current order from maker")
+                    .await;
             }
             wire::MakerToTaker::Hello(_) => {
                 tracing::warn!("Ignoring unexpected Hello message from maker. Hello is only expected when opening a new connection.")

daemon/src/lib.rs

@@ -26,7 +26,6 @@ use xtra::Address;
 
 pub mod sqlx_ext; // Must come first because it is a macro.
 
-pub mod actors;
 pub mod address_map;
 pub mod auth;
 pub mod auto_rollover;
@@ -67,6 +66,7 @@ pub mod try_continue;
 pub mod tx;
 pub mod wallet;
 pub mod wire;
+pub mod xtra_ext;
 
 // Certain operations (e.g. contract setup) take long time in debug mode,
 // causing us to lag behind in processing heartbeats.

daemon/src/maker_cfd.rs

@@ -5,7 +5,6 @@ use crate::cfd_actors::insert_cfd_and_update_feed;
 use crate::cfd_actors::{self};
 use crate::collab_settlement_maker;
 use crate::db::load_cfd;
-use crate::log_error;
 use crate::maker_inc_connections;
 use crate::model::cfd::Cfd;
 use crate::model::cfd::CfdState;
@@ -557,8 +556,10 @@ where
     M: xtra::Handler<monitor::CollaborativeSettlement>,
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle_settlement_completed(&mut self, msg: collab_settlement_maker::Completed) {
-        log_error!(async {
+    async fn handle_settlement_completed(
+        &mut self,
+        msg: collab_settlement_maker::Completed,
+    ) -> Result<()> {
         use collab_settlement_maker::Completed::*;
         let (order_id, settlement, script_pubkey) = match msg {
             Confirmed {
@@ -598,8 +599,7 @@ where
             })
             .await?;
 
-            anyhow::Ok(())
-        });
+        Ok(())
     }
 }
 
@@ -754,8 +754,7 @@ where
     M: xtra::Handler<monitor::StartMonitoring>,
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle_setup_completed(&mut self, msg: setup_maker::Completed) {
-        log_error!(async {
+    async fn handle_setup_completed(&mut self, msg: setup_maker::Completed) -> Result<()> {
         use setup_maker::Completed::*;
         let (order_id, dlc) = match msg {
             NewContract { order_id, dlc } => (order_id, dlc),
@@ -803,7 +802,6 @@ where
             .await?;
 
         Ok(())
-        });
     }
 }
 
@@ -812,8 +810,8 @@ impl<O: 'static, M: 'static, T: 'static, W: 'static> Handler<TakerConnected> for
 where
     T: xtra::Handler<maker_inc_connections::TakerMessage>,
 {
-    async fn handle(&mut self, msg: TakerConnected, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_taker_connected(msg.id));
+    async fn handle(&mut self, msg: TakerConnected, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_taker_connected(msg.id).await
     }
 }
 
@@ -823,8 +821,8 @@ impl<O: 'static, M: 'static, T: 'static, W: 'static> Handler<TakerDisconnected>
 where
     T: xtra::Handler<maker_inc_connections::TakerMessage>,
 {
-    async fn handle(&mut self, msg: TakerDisconnected, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_taker_disconnected(msg.id));
+    async fn handle(&mut self, msg: TakerDisconnected, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_taker_disconnected(msg.id).await
     }
 }
 
@@ -834,8 +832,8 @@ where
     M: xtra::Handler<monitor::StartMonitoring>,
     O: xtra::Handler<oracle::MonitorAttestation>,
 {
-    async fn handle(&mut self, msg: Completed, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_roll_over_completed(msg));
+    async fn handle(&mut self, msg: Completed, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_roll_over_completed(msg).await
     }
 }
 
@@ -844,8 +842,8 @@ impl<O: 'static, M: 'static, T: 'static, W: 'static> Handler<monitor::Event> for
 where
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle(&mut self, msg: monitor::Event, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_monitoring_event(msg))
+    async fn handle(&mut self, msg: monitor::Event, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_monitoring_event(msg).await
     }
 }
 
@@ -866,10 +864,15 @@ where
         + xtra::Handler<wallet::BuildPartyParams>
         + xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle(&mut self, FromTaker { taker_id, msg }: FromTaker, ctx: &mut Context<Self>) {
+    async fn handle(
+        &mut self,
+        FromTaker { taker_id, msg }: FromTaker,
+        ctx: &mut Context<Self>,
+    ) -> Result<()> {
         match msg {
             wire::TakerToMaker::TakeOrder { order_id, quantity } => {
-                log_error!(self.handle_take_order(taker_id, order_id, quantity, ctx))
+                self.handle_take_order(taker_id, order_id, quantity, ctx)
+                    .await?
             }
             wire::TakerToMaker::Settlement {
                 order_id,
@@ -881,17 +884,22 @@ where
                         price,
                     },
             } => {
-                log_error!(self.handle_propose_settlement(
+                if let Err(e) = self
+                    .handle_propose_settlement(
                         taker_id,
                         SettlementProposal {
                             order_id,
                             timestamp,
                             taker,
                             maker,
-                        price
+                            price,
                         },
-                    ctx
-                ))
+                        ctx,
+                    )
+                    .await
+                {
+                    tracing::warn!("Failed ot handle settlement proposal: {:#}", e);
+                }
             }
             wire::TakerToMaker::Settlement {
                 msg: wire::taker_to_maker::Settlement::Initiate { .. },
@@ -903,14 +911,19 @@ where
                 order_id,
                 timestamp,
             } => {
-                log_error!(self.handle_propose_roll_over(
+                if let Err(e) = self
+                    .handle_propose_roll_over(
                         RolloverProposal {
                             order_id,
                             timestamp,
                         },
                         taker_id,
-                    ctx
-                ))
+                        ctx,
+                    )
+                    .await
+                {
+                    tracing::warn!("Failed to handle rollover proposal: {:#}", e);
+                }
             }
             wire::TakerToMaker::RollOverProtocol { .. } => {
                 unreachable!("This kind of message should be sent to the rollover_maker::Actor`")
@@ -921,7 +934,9 @@ where
             TakerToMaker::Hello(_) => {
                 unreachable!("The Hello message is not sent to the cfd actor")
             }
-        }
+        };
+
+        Ok(())
     }
 }
 
@@ -932,24 +947,26 @@ where
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
     async fn handle(&mut self, msg: oracle::Attestation, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_oracle_attestation(msg))
+        if let Err(e) = self.handle_oracle_attestation(msg).await {
+            tracing::warn!("Failed to handle oracle attestation: {:#}", e)
+        }
     }
 }
 
 impl Message for TakerConnected {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl Message for TakerDisconnected {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl Message for Completed {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl Message for FromTaker {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl<O: 'static, M: 'static, T: 'static, W: 'static> xtra::Actor for Actor<O, M, T, W> {}

daemon/src/maker_inc_connections.rs

@@ -20,6 +20,7 @@ use crate::wire::EncryptedJsonCodec;
 use crate::wire::MakerToTaker;
 use crate::wire::TakerToMaker;
 use crate::wire::Version;
+use crate::xtra_ext::LogFailure;
 use crate::Tasks;
 use anyhow::bail;
 use anyhow::Context;
@@ -138,6 +139,7 @@ impl Actor {
             let _ = self
                 .taker_disconnected_channel
                 .send(maker_cfd::TakerDisconnected { id: *taker_id })
+                .log_failure("Failed to inform about taker disconnect")
                 .await;
             let _ = self.connection_tasks.remove(taker_id);
         }
@@ -219,7 +221,7 @@ impl Actor {
         let this = ctx.address().expect("self to be alive");
         let read_fut = async move {
             while let Ok(Some(msg)) = read.try_next().await {
-                let res = this.send(FromTaker { taker_id, msg }).await;
+                let res = this.send(FromTaker { taker_id, msg }).log_failure("").await;
 
                 if res.is_err() {
                     break;
@@ -249,6 +251,7 @@ impl Actor {
         let _ = self
             .taker_connected_channel
             .send(maker_cfd::TakerConnected { id: taker_id })
+            .log_failure("Failed to report new taker connection")
             .await;
 
         Ok(())
@@ -342,7 +345,7 @@ impl Actor {
 
 #[xtra_productivity(message_impl = false)]
 impl Actor {
-    async fn handle_msg_from_taker(&mut self, msg: FromTaker) {
+    async fn handle_msg_from_taker(&mut self, msg: FromTaker) -> Result<()> {
         use wire::TakerToMaker::*;
         match msg.msg {
             Protocol { order_id, msg } => match self.setup_actors.get_connected(&order_id) {
@@ -380,6 +383,8 @@ impl Actor {
                 let _ = self.taker_msg_channel.send(msg);
             }
         }
+
+        Ok(())
     }
 
     async fn handle_setup_actor_stopping(&mut self, message: Stopping<setup_maker::Actor>) {

daemon/src/monitor.rs

@@ -1,4 +1,3 @@
-use crate::log_error;
 use crate::model;
 use crate::model::cfd::CetStatus;
 use crate::model::cfd::Cfd;
@@ -333,7 +332,7 @@ where
         Ok(())
     }
 
-    async fn handle_oracle_attestation(&mut self, attestation: oracle::Attestation) -> Result<()> {
+    async fn handle_oracle_attestation(&mut self, attestation: oracle::Attestation) {
         for (order_id, MonitorParams { cets, .. }) in self
             .cfds
             .clone()
@@ -342,8 +341,6 @@ where
         {
             try_continue!(self.monitor_cet_finality(cets, attestation.clone(), order_id))
         }
-
-        Ok(())
     }
 
     async fn update_state(
@@ -433,7 +430,7 @@ where
 
                     for (target_status, event) in reached_monitoring_target {
                         tracing::info!(%txid, target = %target_status, current = %status, "Bitcoin transaction reached monitoring target");
-                        self.event_channel.send(event).await?;
+                        self.event_channel.send(event).await??;
                     }
                 }
             }
@@ -628,7 +625,7 @@ fn map_cets(
 }
 
 impl xtra::Message for Event {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl xtra::Message for Sync {
@@ -669,14 +666,16 @@ where
     C: bdk::electrum_client::ElectrumApi + Send + 'static,
 {
     async fn handle(&mut self, _: Sync, _ctx: &mut xtra::Context<Self>) {
-        log_error!(self.sync());
+        if let Err(e) = self.sync().await {
+            tracing::warn!("Sync failed: {:#}", e);
+        }
     }
 }
 
 #[async_trait]
 impl xtra::Handler<oracle::Attestation> for Actor {
     async fn handle(&mut self, msg: oracle::Attestation, _ctx: &mut xtra::Context<Self>) {
-        log_error!(self.handle_oracle_attestation(msg));
+        self.handle_oracle_attestation(msg).await
     }
 }
 
@@ -852,8 +851,10 @@ mod tests {
 
     #[async_trait]
     impl xtra::Handler<Event> for MessageRecordingActor {
-        async fn handle(&mut self, message: Event, _ctx: &mut xtra::Context<Self>) {
+        async fn handle(&mut self, message: Event, _ctx: &mut xtra::Context<Self>) -> Result<()> {
             self.events.push(message);
+
+            Ok(())
         }
     }
 

daemon/src/oracle.rs

@@ -1,9 +1,9 @@
-use crate::log_error;
 use crate::model::cfd::Cfd;
 use crate::model::cfd::CfdState;
 use crate::model::BitMexPriceEventId;
 use crate::tokio_ext;
 use crate::try_continue;
+use crate::xtra_ext::LogFailure;
 use anyhow::Context;
 use anyhow::Result;
 use async_trait::async_trait;
@@ -188,6 +188,7 @@ impl Actor {
                     id: event_id,
                     attestation,
                 })
+                .log_failure("Failed to send attestation to oracle::Actor")
                 .await?;
 
                 Ok(())
@@ -257,8 +258,13 @@ pub struct NoAnnouncement(pub BitMexPriceEventId);
 
 #[async_trait]
 impl xtra::Handler<NewAttestationFetched> for Actor {
-    async fn handle(&mut self, msg: NewAttestationFetched, _ctx: &mut xtra::Context<Self>) {
-        log_error!(self.handle_new_attestation_fetched(msg.id, msg.attestation));
+    async fn handle(
+        &mut self,
+        msg: NewAttestationFetched,
+        _ctx: &mut xtra::Context<Self>,
+    ) -> Result<()> {
+        self.handle_new_attestation_fetched(msg.id, msg.attestation)
+            .await
     }
 }
 
@@ -305,7 +311,7 @@ impl xtra::Message for Attestation {
 }
 
 impl xtra::Message for NewAttestationFetched {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 mod olivia_api {

daemon/src/rollover_maker.rs

@@ -20,6 +20,7 @@ use crate::tokio_ext::spawn_fallible;
 use crate::wire;
 use crate::wire::MakerToTaker;
 use crate::wire::RollOverMsg;
+use crate::xtra_ext::LogFailure;
 use crate::Cfd;
 use crate::Stopping;
 use anyhow::Context as _;
@@ -140,7 +141,10 @@ impl Actor {
             order_id: self.cfd.id(),
             dlc,
         };
-        self.maker_cfd_actor.send(msg).await?;
+        self.maker_cfd_actor
+            .send(msg)
+            .log_failure("Failed to report rollover completion")
+            .await?;
         ctx.stop();
         Ok(())
     }

daemon/src/setup_maker.rs

@@ -14,6 +14,7 @@ use crate::tokio_ext::spawn_fallible;
 use crate::wallet;
 use crate::wire;
 use crate::wire::SetupMsg;
+use crate::xtra_ext::LogFailure;
 use anyhow::Context;
 use anyhow::Result;
 use async_trait::async_trait;
@@ -121,7 +122,11 @@ impl Actor {
     }
 
     async fn complete(&mut self, completed: Completed, ctx: &mut xtra::Context<Self>) {
-        let _ = self.on_completed.send(completed).await;
+        let _ = self
+            .on_completed
+            .send(completed)
+            .log_failure("Failed to inform about contract setup completion")
+            .await;
 
         ctx.stop();
     }

daemon/src/setup_taker.rs

@@ -13,6 +13,7 @@ use crate::tokio_ext::spawn_fallible;
 use crate::wallet;
 use crate::wire;
 use crate::wire::SetupMsg;
+use crate::xtra_ext::LogFailure;
 use anyhow::Context;
 use anyhow::Result;
 use async_trait::async_trait;
@@ -74,7 +75,10 @@ impl Actor {
 
         // inform the `taker_cfd::Actor` about the start of contract
         // setup, so that the db and UI can be updated accordingly
-        self.on_accepted.send(Started(order_id)).await?;
+        self.on_accepted
+            .send(Started(order_id))
+            .log_failure("Failed to inform about contract setup start")
+            .await?;
 
         let (sender, receiver) = mpsc::unbounded::<SetupMsg>();
         // store the writing end to forward messages from the maker to
@@ -124,6 +128,7 @@ impl Actor {
 
         self.on_completed
             .send(Completed::Rejected { order_id })
+            .log_failure("Failed to inform about contract setup rejection")
             .await?;
 
         ctx.stop();
@@ -147,6 +152,7 @@ impl Actor {
                 order_id: msg.order_id,
                 dlc: msg.dlc,
             })
+            .log_failure("Failed to inform about contract setup completion")
             .await?;
 
         ctx.stop();
@@ -160,6 +166,7 @@ impl Actor {
                 order_id: msg.order_id,
                 error: msg.error,
             })
+            .log_failure("Failed to inform about contract setup failure")
             .await?;
 
         ctx.stop();
@@ -240,11 +247,11 @@ impl Rejected {
 }
 
 impl xtra::Message for Started {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl xtra::Message for Completed {
-    type Result = ();
+    type Result = Result<()>;
 }
 
 impl address_map::ActorName for Actor {

daemon/src/taker_cfd.rs

@@ -5,7 +5,6 @@ use crate::cfd_actors::{self};
 use crate::collab_settlement_taker;
 use crate::connection;
 use crate::db::load_cfd;
-use crate::log_error;
 use crate::model::cfd::Cfd;
 use crate::model::cfd::CfdState;
 use crate::model::cfd::CfdStateCommon;
@@ -412,8 +411,8 @@ where
 
 #[xtra_productivity]
 impl<O, M, W> Actor<O, M, W> {
-    async fn handle_current_order(&mut self, msg: CurrentOrder) {
-        log_error!(self.handle_new_order(msg.0));
+    async fn handle_current_order(&mut self, msg: CurrentOrder) -> Result<()> {
+        self.handle_new_order(msg.0).await
     }
 }
 
@@ -424,8 +423,8 @@ where
     M: xtra::Handler<monitor::StartMonitoring>,
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle(&mut self, msg: Completed, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_setup_completed(msg))
+    async fn handle(&mut self, msg: Completed, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_setup_completed(msg).await
     }
 }
 
@@ -434,8 +433,8 @@ impl<O: 'static, M: 'static, W: 'static> Handler<monitor::Event> for Actor<O, M,
 where
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
-    async fn handle(&mut self, msg: monitor::Event, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_monitoring_event(msg))
+    async fn handle(&mut self, msg: monitor::Event, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_monitoring_event(msg).await
     }
 }
 
@@ -445,14 +444,16 @@ where
     W: xtra::Handler<wallet::TryBroadcastTransaction>,
 {
     async fn handle(&mut self, msg: oracle::Attestation, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_oracle_attestation(msg))
+        if let Err(e) = self.handle_oracle_attestation(msg).await {
+            tracing::warn!("Failed to handle oracle attestation: {:#}", e)
+        }
     }
 }
 
 #[async_trait]
 impl<O: 'static, M: 'static, W: 'static> Handler<setup_taker::Started> for Actor<O, M, W> {
-    async fn handle(&mut self, msg: setup_taker::Started, _ctx: &mut Context<Self>) {
-        log_error!(self.handle_setup_started(msg.0))
+    async fn handle(&mut self, msg: setup_taker::Started, _ctx: &mut Context<Self>) -> Result<()> {
+        self.handle_setup_started(msg.0).await
     }
 }
 

daemon/src/xtra_ext.rs

@@ -0,0 +1,50 @@
+use async_trait::async_trait;
+use xtra::address;
+use xtra::message_channel;
+use xtra::Actor;
+use xtra::Disconnected;
+use xtra::Message;
+
+#[async_trait]
+pub trait LogFailure {
+    async fn log_failure(self, context: &str) -> Result<(), Disconnected>;
+}
+
+#[async_trait]
+impl<A, M> LogFailure for address::SendFuture<A, M>
+where
+    A: Actor,
+    M: Message<Result = anyhow::Result<()>>,
+{
+    async fn log_failure(self, context: &str) -> Result<(), Disconnected> {
+        if let Err(e) = self.await? {
+            tracing::warn!(
+                "{}: Message handler for message {} failed: {:#}",
+                context,
+                std::any::type_name::<M>(),
+                e
+            );
+        }
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl<M> LogFailure for message_channel::SendFuture<M>
+where
+    M: xtra::Message<Result = anyhow::Result<()>>,
+{
+    async fn log_failure(self, context: &str) -> Result<(), Disconnected> {
+        if let Err(e) = self.await? {
+            tracing::warn!(
+                "{}: Message handler for message {} failed: {:#}",
+                context,
+                std::any::type_name::<M>(),
+                e
+            );
+        }
+
+        Ok(())
+    }
+}

daemon/tests/harness/mocks/monitor.rs

@@ -1,8 +1,7 @@
-use std::sync::Arc;
-
 use daemon::monitor;
 use daemon::oracle;
 use mockall::*;
+use std::sync::Arc;
 use tokio::sync::Mutex;
 use xtra_productivity::xtra_productivity;
 
@@ -30,7 +29,7 @@ impl MonitorActor {
     }
 
     async fn handle(&mut self, msg: oracle::Attestation) {
-        self.mock.lock().await.oracle_attestation(msg)
+        self.mock.lock().await.oracle_attestation(msg);
     }
 }
 

daemon/tests/harness/mod.rs

@@ -367,9 +367,13 @@ impl Taker {
 #[macro_export]
 macro_rules! deliver_event {
     ($maker:expr, $taker:expr, $event:expr) => {
+        #[allow(unused_must_use)]
+        {
             tracing::debug!("Delivering event: {:?}", $event);
+
             $taker.system.cfd_actor_addr.send($event).await.unwrap();
             $maker.system.cfd_actor_addr.send($event).await.unwrap();
+        }
     };
 }