Fix file sync pending due to peer connection timeout (#95)

* enhance logs for sync module

* report peer if connection timeout

* Use origin timestamp of sync state to determine if sync too long to terminate

* fix compilation error

node/sync/src/auto_sync/manager.rs

@@ -119,8 +119,11 @@ impl Manager {
     }
 
     pub async fn update_on_announcement(&self, announced_tx_seq: u64) {
-        // new file announced
+        let next_tx_seq = self.next_tx_seq.load(Ordering::Relaxed);
         let max_tx_seq = self.max_tx_seq.load(Ordering::Relaxed);
+        debug!(%next_tx_seq, %max_tx_seq, %announced_tx_seq, "Update for new announcement");
+
+        // new file announced
         if max_tx_seq == u64::MAX || announced_tx_seq > max_tx_seq {
             match self.sync_store.set_max_tx_seq(announced_tx_seq).await {
                 Ok(()) => self.max_tx_seq.store(announced_tx_seq, Ordering::Relaxed),
@@ -130,7 +133,7 @@ impl Manager {
         }
 
         // already wait for sequential sync
-        if announced_tx_seq >= self.next_tx_seq.load(Ordering::Relaxed) {
+        if announced_tx_seq >= next_tx_seq {
             return;
         }
 
@@ -142,7 +145,8 @@ impl Manager {
 
     async fn move_forward(&self, pending: bool) -> Result<bool> {
         let tx_seq = self.next_tx_seq.load(Ordering::Relaxed);
-        if tx_seq > self.max_tx_seq.load(Ordering::Relaxed) {
+        let max_tx_seq = self.max_tx_seq.load(Ordering::Relaxed);
+        if tx_seq > max_tx_seq {
             return Ok(false);
         }
 
@@ -155,6 +159,8 @@ impl Manager {
         self.sync_store.set_next_tx_seq(next_tx_seq).await?;
         self.next_tx_seq.store(next_tx_seq, Ordering::Relaxed);
 
+        debug!(%next_tx_seq, %max_tx_seq, "Move forward");
+
         Ok(true)
     }
 
@@ -189,10 +195,11 @@ impl Manager {
             }
         }
 
-        if matches!(state, Some(SyncState::FindingPeers { since, .. }) if since.elapsed() > self.config.find_peer_timeout)
+        if matches!(state, Some(SyncState::FindingPeers { origin, .. }) if origin.elapsed() > self.config.find_peer_timeout)
         {
             // no peers found for a long time
             self.terminate_file_sync(tx_seq, false).await;
+            info!(%tx_seq, "Terminate file sync due to finding peers timeout");
             Ok(true)
         } else {
             // otherwise, continue to wait for file sync that already in progress
@@ -310,7 +317,10 @@ impl Manager {
         loop {
             if next {
                 match self.sync_store.random_tx().await {
-                    Ok(Some(seq)) => tx_seq = seq,
+                    Ok(Some(seq)) => {
+                        tx_seq = seq;
+                        debug!(%tx_seq, "Start to sync pending file");
+                    }
                     Ok(None) => {
                         trace!("No pending file to sync");
                         sleep(INTERVAL).await;
@@ -578,8 +588,8 @@ mod tests {
             // no peers for file sync for a long time
             SyncResponse::SyncStatus {
                 status: Some(SyncState::FindingPeers {
-                    since: Instant::now().sub(Duration::from_secs(10000)),
-                    updated: Instant::now(),
+                    origin: Instant::now().sub(Duration::from_secs(10000)),
+                    since: Instant::now(),
                 }),
             },
             // required to terminate the file sync

node/sync/src/controllers/peers.rs

@@ -1,11 +1,14 @@
-use network::{Multiaddr, PeerId};
+use network::{Multiaddr, PeerAction, PeerId};
 use rand::seq::IteratorRandom;
 use std::cmp::Ordering;
 use std::collections::{BTreeSet, HashMap};
+use std::sync::Arc;
 use std::time::{Duration, Instant};
 use std::vec;
 use storage::config::ShardConfig;
 
+use crate::context::SyncNetworkContext;
+
 const PEER_CONNECT_TIMEOUT: Duration = Duration::from_secs(5);
 const PEER_DISCONNECT_TIMEOUT: Duration = Duration::from_secs(5);
 
@@ -39,12 +42,20 @@ impl PeerInfo {
     }
 }
 
-#[derive(Default, Debug)]
+#[derive(Default)]
 pub struct SyncPeers {
     peers: HashMap<PeerId, PeerInfo>,
+    ctx: Option<Arc<SyncNetworkContext>>,
 }
 
 impl SyncPeers {
+    pub fn new(ctx: Arc<SyncNetworkContext>) -> Self {
+        Self {
+            peers: Default::default(),
+            ctx: Some(ctx),
+        }
+    }
+
     pub fn add_new_peer_with_config(
         &mut self,
         peer_id: PeerId,
@@ -181,6 +192,13 @@ impl SyncPeers {
                     if info.since.elapsed() >= PEER_CONNECT_TIMEOUT {
                         info!(%peer_id, %info.addr, "Peer connection timeout");
                         bad_peers.push(*peer_id);
+                        if let Some(ctx) = &self.ctx {
+                            ctx.report_peer(
+                                *peer_id,
+                                PeerAction::LowToleranceError,
+                                "Dail timeout",
+                            );
+                        }
                     }
                 }
 

node/sync/src/controllers/serial.rs

@@ -33,8 +33,8 @@ pub enum FailureReason {
 pub enum SyncState {
     Idle,
     FindingPeers {
+        origin: Instant,
         since: Instant,
-        updated: Instant,
     },
     FoundPeers,
     ConnectingPeers,
@@ -110,7 +110,7 @@ impl SerialSyncController {
             next_chunk: goal.index_start,
             failures: 0,
             state: SyncState::Idle,
-            peers: Default::default(),
+            peers: SyncPeers::new(ctx.clone()),
             ctx,
             store,
             file_location_cache,
@@ -169,14 +169,10 @@ impl SerialSyncController {
             self.publish_find_chunks();
         }
 
-        let now = Instant::now();
-
-        let (since, updated) = match self.state {
-            SyncState::FindingPeers { since, .. } => (since, now),
-            _ => (now, now),
+        self.state = SyncState::FindingPeers {
+            origin: self.since,
+            since: Instant::now(),
         };
-
-        self.state = SyncState::FindingPeers { since, updated };
     }
 
     fn publish_find_file(&mut self) {
@@ -563,10 +559,14 @@ impl SerialSyncController {
     pub fn transition(&mut self) {
         use PeerState::*;
 
+        debug!(%self.tx_seq, ?self.state, "transition started");
+
         // update peer connection states
         self.peers.transition();
 
-        loop {
+        let mut completed = false;
+
+        while !completed {
             match self.state {
                 SyncState::Idle => {
                     if self.peers.count(&[Found, Connecting, Connected]) > 0 {
@@ -576,19 +576,19 @@ impl SerialSyncController {
                     }
                 }
 
-                SyncState::FindingPeers { updated, .. } => {
+                SyncState::FindingPeers { since, .. } => {
                     if self.peers.count(&[Found, Connecting, Connected]) > 0 {
                         self.state = SyncState::FoundPeers;
                     } else {
                         // storage node may not have the specific file when `FindFile`
                         // gossip message received. In this case, just broadcast the
                         // `FindFile` message again.
-                        if updated.elapsed() >= PEER_REQUEST_TIMEOUT {
-                            debug!(%self.tx_seq, "Peer request timeout");
+                        if since.elapsed() >= PEER_REQUEST_TIMEOUT {
+                            debug!(%self.tx_seq, "Finding peer timeout and try to find peers again");
                             self.try_find_peers();
                         }
 
-                        return;
+                        completed = true;
                     }
                 }
 
@@ -606,43 +606,48 @@ impl SerialSyncController {
                             since: Instant::now(),
                         };
                     } else if self.peers.count(&[Connecting]) == 0 {
+                        debug!(%self.tx_seq, "Connecting to peers timeout and try to find other peers to dial");
                         self.state = SyncState::Idle;
                     } else {
                         // peers.transition() will handle the case that peer connecting timeout
-                        return;
+                        completed = true;
                     }
                 }
 
                 SyncState::AwaitingOutgoingConnection { since } => {
                     if since.elapsed() < WAIT_OUTGOING_CONNECTION_TIMEOUT {
-                        return;
+                        completed = true;
+                    } else {
+                        debug!(%self.tx_seq, "Waiting for outgoing connection timeout and try to find other peers to dial");
+                        self.state = SyncState::Idle;
                     }
-
-                    self.state = SyncState::Idle;
                 }
 
                 SyncState::AwaitingDownload { since } => {
                     if Instant::now() < since {
-                        return;
+                        completed = true;
+                    } else {
+                        self.try_request_next();
                     }
-
-                    self.try_request_next();
                 }
 
                 SyncState::Downloading { peer_id, since, .. } => {
                     if !matches!(self.peers.peer_state(&peer_id), Some(PeerState::Connected)) {
                         // e.g. peer disconnected by remote node
+                        debug!(%self.tx_seq, "No peer to continue downloading and try to find other peers to download");
                         self.state = SyncState::Idle;
                     } else if since.elapsed() >= DOWNLOAD_TIMEOUT {
                         self.handle_response_failure(peer_id, "RPC timeout");
                     } else {
-                        return;
+                        completed = true;
                     }
                 }
 
-                SyncState::Completed | SyncState::Failed { .. } => return,
+                SyncState::Completed | SyncState::Failed { .. } => completed = true,
             }
         }
+
+        debug!(%self.tx_seq, ?self.state, "transition ended");
     }
 }
 

node/sync/src/service.rs

@@ -175,7 +175,7 @@ impl SyncService {
             manager,
         };
 
-        debug!("Starting sync service");
+        info!("Starting sync service");
         executor.spawn(async move { Box::pin(sync.main()).await }, "sync");
 
         Ok(sync_send)
@@ -306,7 +306,6 @@ impl SyncService {
                 tx_seq,
                 is_reverted,
             } => {
-                debug!(?tx_seq, "terminate file sync");
                 let count = self.on_terminate_file_sync(tx_seq, is_reverted);
                 let _ = sender.send(SyncResponse::TerminateFileSync { count });
             }
@@ -314,7 +313,7 @@ impl SyncService {
     }
 
     fn on_dail_failed(&mut self, peer_id: PeerId, err: DialError) {
-        info!(%peer_id, "Dail to peer failed");
+        info!(%peer_id, ?err, "Dail to peer failed");
 
         for controller in self.controllers.values_mut() {
             controller.on_dail_failed(peer_id, &err);
@@ -525,7 +524,7 @@ impl SyncService {
         maybe_range: Option<(u64, u64)>,
         maybe_peer: Option<(PeerId, Multiaddr)>,
     ) -> Result<()> {
-        info!(%tx_seq, "Start to sync file");
+        info!(%tx_seq, ?maybe_range, ?maybe_peer, "Start to sync file");
 
         // remove failed entry if caused by tx reverted, so as to re-sync
         // file with latest tx_id.
@@ -541,10 +540,14 @@ impl SyncService {
 
         if tx_reverted {
             self.controllers.remove(&tx_seq);
+            info!(%tx_seq, "Terminate file sync due to tx reverted");
         }
 
         let controller = match self.controllers.entry(tx_seq) {
-            Entry::Occupied(entry) => entry.into_mut(),
+            Entry::Occupied(entry) => {
+                debug!(%tx_seq, "File already in sync");
+                entry.into_mut()
+            }
             Entry::Vacant(entry) => {
                 let tx = match self.store.get_tx_by_seq_number(tx_seq).await? {
                     Some(tx) => tx,
@@ -587,6 +590,7 @@ impl SyncService {
         // Trigger file or chunks sync again if completed or failed.
         if controller.is_completed_or_failed() {
             controller.reset(maybe_range);
+            debug!(%tx_seq, "Reset completed or failed file sync");
         }
 
         if let Some((peer_id, addr)) = maybe_peer {
@@ -661,6 +665,7 @@ impl SyncService {
     /// Note, this function should be as fast as possible to avoid
     /// message lagged in channel.
     fn on_terminate_file_sync(&mut self, min_tx_seq: u64, is_reverted: bool) -> usize {
+        info!(%min_tx_seq, %is_reverted, "Terminate file sync");
         let mut to_terminate = vec![];
 
         if is_reverted {
@@ -677,20 +682,32 @@ impl SyncService {
             self.controllers.remove(tx_seq);
         }
 
+        debug!(?to_terminate, "File sync terminated");
+
         to_terminate.len()
     }
 
     fn on_heartbeat(&mut self) {
         let mut completed = vec![];
+        let mut incompleted = vec![];
 
         for (&tx_seq, controller) in self.controllers.iter_mut() {
             controller.transition();
 
             if let SyncState::Completed = controller.get_status() {
                 completed.push(tx_seq);
+            } else {
+                incompleted.push(tx_seq);
             }
         }
 
+        if !completed.is_empty() || !incompleted.is_empty() {
+            debug!(
+                "Sync stat: incompleted = {:?}, completed = {:?}",
+                incompleted, completed
+            );
+        }
+
         for tx_seq in completed {
             self.controllers.remove(&tx_seq);
         }