Merge #398

398: Don't fail for loops r=da-kami a=da-kami

We should not fail for loops where we loop over cfds to process state updates based on information we learned / restart. 
We use a macro to wrap all fallible code in the loop to just print an error and continue. 

Note: I went over the codebase in search of other for loops, maybe someone else can do another grep :)

Co-authored-by: Daniel Karzel <daniel@comit.network>

daemon/src/cfd_actors.rs

@@ -1,8 +1,8 @@
 use crate::db::load_cfd_by_order_id;
 use crate::model::cfd::{Attestation, Cfd, CfdState, CfdStateChangeEvent, OrderId};
 use crate::wallet::Wallet;
-use crate::{db, monitor, oracle};
+use crate::{db, monitor, oracle, try_continue};
-use anyhow::{bail, Result};
+use anyhow::{bail, Context, Result};
 use sqlx::pool::PoolConnection;
 use sqlx::Sqlite;
 use tokio::sync::watch;
@@ -128,28 +128,28 @@ pub async fn handle_oracle_attestation(
         .iter_mut()
         .filter_map(|cfd| cfd.dlc().map(|dlc| (cfd, dlc)))
     {
-        if cfd
+        let attestation = try_continue!(Attestation::new(
-            .handle(CfdStateChangeEvent::OracleAttestation(Attestation::new(
+            attestation.id,
-                attestation.id,
+            attestation.price,
-                attestation.price,
+            attestation.scalars.clone(),
-                attestation.scalars.clone(),
+            dlc,
-                dlc,
+            cfd.role(),
-                cfd.role(),
+        ));
-            )?))?
+
-            .is_none()
+        let new_state =
-        {
+            try_continue!(cfd.handle(CfdStateChangeEvent::OracleAttestation(attestation)));
+
+        if new_state.is_none() {
             // if we don't transition to a new state after oracle attestation we ignore the cfd
             // this is for cases where we cannot handle the attestation which should be in a
             // final state
             continue;
         }
 
-        append_cfd_state(cfd, conn, update_sender).await?;
+        try_continue!(append_cfd_state(cfd, conn, update_sender).await);
-
+        try_continue!(try_cet_publication(cfd, conn, wallet, update_sender)
-        if let Err(e) = try_cet_publication(cfd, conn, wallet, update_sender).await {
+            .await
-            tracing::error!("Error when trying to publish CET: {:#}", e);
+            .context("Error when trying to publish CET"));
-            continue;
-        }
     }
 
     Ok(())

daemon/src/housekeeping.rs

@@ -1,10 +1,10 @@
 use crate::db::{append_cfd_state, load_all_cfds};
 use crate::model::cfd::{Cfd, CfdState};
+use crate::try_continue;
 use crate::wallet::Wallet;
 use anyhow::Result;
 use sqlx::pool::PoolConnection;
 use sqlx::Sqlite;
-
 pub async fn transition_non_continue_cfds_to_setup_failed(
     conn: &mut PoolConnection<Sqlite>,
 ) -> Result<()> {
@@ -29,29 +29,28 @@ pub async fn rebroadcast_transactions(
     let cfds = load_all_cfds(conn).await?;
 
     for dlc in cfds.iter().filter_map(|cfd| Cfd::pending_open_dlc(cfd)) {
-        let txid = wallet.try_broadcast_transaction(dlc.lock.0.clone()).await?;
+        let txid = try_continue!(wallet.try_broadcast_transaction(dlc.lock.0.clone()).await);
-
         tracing::info!("Lock transaction published with txid {}", txid);
     }
 
     for cfd in cfds.iter().filter(|cfd| Cfd::is_must_refund(cfd)) {
         let signed_refund_tx = cfd.refund_tx()?;
-        let txid = wallet.try_broadcast_transaction(signed_refund_tx).await?;
+        let txid = try_continue!(wallet.try_broadcast_transaction(signed_refund_tx).await);
 
         tracing::info!("Refund transaction published on chain: {}", txid);
     }
 
     for cfd in cfds.iter().filter(|cfd| Cfd::is_pending_commit(cfd)) {
         let signed_commit_tx = cfd.commit_tx()?;
-        let txid = wallet.try_broadcast_transaction(signed_commit_tx).await?;
+        let txid = try_continue!(wallet.try_broadcast_transaction(signed_commit_tx).await);
 
         tracing::info!("Commit transaction published on chain: {}", txid);
     }
 
     for cfd in cfds.iter().filter(|cfd| Cfd::is_pending_cet(cfd)) {
-        // Double question-mark OK because if we are in PendingCet we must have been Ready before
+        // Double question mark OK because if we are in PendingCet we must have been Ready before
         let signed_cet = cfd.cet()??;
-        let txid = wallet.try_broadcast_transaction(signed_cet).await?;
+        let txid = try_continue!(wallet.try_broadcast_transaction(signed_cet).await);
 
         tracing::info!("CET published on chain: {}", txid);
     }

daemon/src/lib.rs

@@ -22,6 +22,7 @@ pub mod setup_contract;
 pub mod taker_cfd;
 pub mod to_sse_event;
 pub mod tokio_ext;
+pub mod try_continue;
 pub mod wallet;
 pub mod wallet_sync;
 pub mod wire;

daemon/src/try_continue.rs

@@ -0,0 +1,13 @@
+/// Wrapper for errors in loop that logs error and continues
+#[macro_export]
+macro_rules! try_continue {
+    ($result:expr) => {
+        match $result {
+            Ok(value) => value,
+            Err(e) => {
+                tracing::error!("{:#}", e);
+                continue;
+            }
+        }
+    };
+}