Limit network actions to tracked chains (in main) (#2393)

* Add a `tracked_chains` field to `ChainWorkerState`

Prepare to only create network actions for the set of tracked chains.

* Add a `tracked_chains` field to `WorkerState`

Share it with the created chain worker actors.

* Add a `tracked_chains` field to `Client` type

Keep track of the chains that client is interested in.

* Select tracked chains when starting

Specify which chains should be tracked by a new `Client`.

* Forward tracked chains to `WorkerState`

Configure the worker based on the client's selection.

* Only create network actions for tracked chains

Avoid handling chains that aren't interesting to the client.

* Add `retry_pending_cross_chain_requests` helper

Allow resending messages intended for chains that weren't tracked when
the outgoing message was scheduled, but became tracked later.

* Add `Client::track_chain` method

Allow adding more chains to the initial set of tracked chains.

* Track newly created chains

Ensure that chains that the client open are tracked.

* Ensure newly assigned chain is tracked

So that the worker can properly handle it.

* Track chains used in benchmark

Ensure that they are properly executed during the benchmark.

* Add a TODO to merge tracked chains set

Remember to replace the quick-fix with a more comprehensive refactor.

* Track chains created during block execution

Check all executed blocks for messages that open new chains, and add the
new chain IDs to the set of tracked chains.

linera-client/src/client_context.rs

@@ -146,6 +146,7 @@ where
             storage,
             options.max_pending_messages,
             delivery,
+            wallet.chain_ids(),
         );
 
         ClientContext {
@@ -519,9 +520,15 @@ where
                     .expect("failed to create new chain");
                 let chain_id = ChainId::child(message_id);
                 key_pairs.insert(chain_id, key_pair.copy());
+                self.client.track_chain(chain_id);
                 self.update_wallet_for_new_chain(chain_id, Some(key_pair.copy()), timestamp);
             }
         }
+        let updated_chain_client = self.make_chain_client(default_chain_id);
+        updated_chain_client
+            .retry_pending_outgoing_messages()
+            .await
+            .context("outgoing messages to create the new chains should be delivered")?;
 
         for chain_id in key_pairs.keys() {
             let child_client = self.make_chain_client(*chain_id);

linera-client/src/unit_tests/chain_listener.rs

@@ -150,6 +150,7 @@ async fn test_chain_listener() -> anyhow::Result<()> {
             storage.clone(),
             10,
             delivery,
+            [chain_id0],
         )),
     };
     let key_pair = KeyPair::generate_from(&mut rng);

linera-core/src/chain_worker/actor.rs

@@ -4,8 +4,9 @@
 //! An actor that runs a chain worker.
 
 use std::{
+    collections::HashSet,
     fmt::{self, Debug, Formatter},
-    sync::Arc,
+    sync::{Arc, RwLock},
 };
 
 use linera_base::{
@@ -151,6 +152,7 @@ where
         storage: StorageClient,
         certificate_value_cache: Arc<ValueCache<CryptoHash, HashedCertificateValue>>,
         blob_cache: Arc<ValueCache<BlobId, Blob>>,
+        tracked_chains: Option<Arc<RwLock<HashSet<ChainId>>>>,
         chain_id: ChainId,
     ) -> Result<Self, WorkerError> {
         let (service_runtime_thread, execution_state_receiver, runtime_request_sender) =
@@ -161,6 +163,7 @@ where
             storage,
             certificate_value_cache,
             blob_cache,
+            tracked_chains,
             chain_id,
             execution_state_receiver,
             runtime_request_sender,

linera-core/src/chain_worker/state/attempted_changes.rs

@@ -346,6 +346,7 @@ where
         tip.num_outgoing_messages += executed_block.outcome.messages.len() as u32;
         self.state.chain.confirmed_log.push(certificate.hash());
         let info = ChainInfoResponse::new(&self.state.chain, self.state.config.key_pair());
+        self.state.track_newly_created_chains(executed_block);
         let mut actions = self.state.create_network_actions().await?;
         actions.notifications.push(Notification {
             chain_id: block.chain_id,

linera-core/src/chain_worker/state/mod.rs

@@ -9,7 +9,7 @@ mod temporary_changes;
 use std::{
     borrow::Cow,
     collections::{BTreeMap, BTreeSet, HashMap, HashSet},
-    sync::Arc,
+    sync::{self, Arc},
 };
 
 use linera_base::{
@@ -26,8 +26,8 @@ use linera_chain::{
     ChainError, ChainStateView,
 };
 use linera_execution::{
-    committee::Epoch, ExecutionRequest, Query, QueryContext, Response, ServiceRuntimeRequest,
-    UserApplicationDescription, UserApplicationId,
+    committee::Epoch, ExecutionRequest, Message, Query, QueryContext, Response,
+    ServiceRuntimeRequest, SystemMessage, UserApplicationDescription, UserApplicationId,
 };
 use linera_storage::Storage;
 use linera_views::views::{ClonableView, ViewError};
@@ -60,6 +60,7 @@ where
     runtime_request_sender: std::sync::mpsc::Sender<ServiceRuntimeRequest>,
     recent_hashed_certificate_values: Arc<ValueCache<CryptoHash, HashedCertificateValue>>,
     recent_blobs: Arc<ValueCache<BlobId, Blob>>,
+    tracked_chains: Option<Arc<sync::RwLock<HashSet<ChainId>>>>,
     knows_chain_is_active: bool,
 }
 
@@ -69,11 +70,13 @@ where
     ViewError: From<StorageClient::StoreError>,
 {
     /// Creates a new [`ChainWorkerState`] using the provided `storage` client.
+    #[allow(clippy::too_many_arguments)]
     pub async fn load(
         config: ChainWorkerConfig,
         storage: StorageClient,
         certificate_value_cache: Arc<ValueCache<CryptoHash, HashedCertificateValue>>,
         blob_cache: Arc<ValueCache<BlobId, Blob>>,
+        tracked_chains: Option<Arc<sync::RwLock<HashSet<ChainId>>>>,
         chain_id: ChainId,
         execution_state_receiver: futures::channel::mpsc::UnboundedReceiver<ExecutionRequest>,
         runtime_request_sender: std::sync::mpsc::Sender<ServiceRuntimeRequest>,
@@ -89,6 +92,7 @@ where
             runtime_request_sender,
             recent_hashed_certificate_values: certificate_value_cache,
             recent_blobs: blob_cache,
+            tracked_chains,
             knows_chain_is_active: false,
         })
     }
@@ -369,11 +373,41 @@ where
         self.recent_blobs.insert(blob).await
     }
 
+    /// Adds any newly created chains to the set of `tracked_chains`.
+    fn track_newly_created_chains(&self, block: &ExecutedBlock) {
+        if let Some(tracked_chains) = self.tracked_chains.as_ref() {
+            let messages = block.messages().iter().flatten();
+            let open_chain_message_indices =
+                messages
+                    .enumerate()
+                    .filter_map(|(index, outgoing_message)| match outgoing_message.message {
+                        Message::System(SystemMessage::OpenChain(_)) => Some(index),
+                        _ => None,
+                    });
+            let open_chain_message_ids =
+                open_chain_message_indices.map(|index| block.message_id(index as u32));
+            let new_chain_ids = open_chain_message_ids.map(ChainId::child);
+
+            tracked_chains
+                .write()
+                .expect("Panics should not happen while holding a lock to `tracked_chains`")
+                .extend(new_chain_ids);
+        }
+    }
+
     /// Loads pending cross-chain requests.
     async fn create_network_actions(&self) -> Result<NetworkActions, WorkerError> {
         let mut heights_by_recipient: BTreeMap<_, BTreeMap<_, _>> = Default::default();
-        let pairs = self.chain.outboxes.try_load_all_entries().await?;
-        for (target, outbox) in pairs {
+        let mut targets = self.chain.outboxes.indices().await?;
+        if let Some(tracked_chains) = self.tracked_chains.as_ref() {
+            let tracked_chains = tracked_chains
+                .read()
+                .expect("Panics should not happen while holding a lock to `tracked_chains`");
+            targets.retain(|target| tracked_chains.contains(&target.recipient));
+        }
+        let outboxes = self.chain.outboxes.try_load_entries(&targets).await?;
+        for (target, outbox) in targets.into_iter().zip(outboxes) {
+            let outbox = outbox.expect("Only existing outboxes should be referenced by `indices`");
             let heights = outbox.queue.elements().await?;
             heights_by_recipient
                 .entry(target.recipient)

linera-core/src/client.rs

@@ -7,7 +7,7 @@ use std::{
     convert::Infallible,
     iter,
     ops::{Deref, DerefMut},
-    sync::Arc,
+    sync::{Arc, RwLock},
 };
 
 use dashmap::{
@@ -91,6 +91,9 @@ where
     message_policy: MessagePolicy,
     /// Whether to block on cross-chain message delivery.
     cross_chain_message_delivery: CrossChainMessageDelivery,
+    /// Chains that should be tracked by the client.
+    // TODO(#2412): Merge with set of chains the client is receiving notifications from validators
+    tracked_chains: Arc<RwLock<HashSet<ChainId>>>,
     /// References to clients waiting for chain notifications.
     notifier: Arc<Notifier<Notification>>,
     /// A copy of the storage client so that we don't have to lock the local node client
@@ -111,10 +114,16 @@ where
         storage: S,
         max_pending_messages: usize,
         cross_chain_message_delivery: CrossChainMessageDelivery,
+        tracked_chains: impl IntoIterator<Item = ChainId>,
     ) -> Self {
-        let state = WorkerState::new_for_client("Client node".to_string(), storage.clone())
-            .with_allow_inactive_chains(true)
-            .with_allow_messages_from_deprecated_epochs(true);
+        let tracked_chains = Arc::new(RwLock::new(tracked_chains.into_iter().collect()));
+        let state = WorkerState::new_for_client(
+            "Client node".to_string(),
+            storage.clone(),
+            tracked_chains.clone(),
+        )
+        .with_allow_inactive_chains(true)
+        .with_allow_messages_from_deprecated_epochs(true);
         let local_node = LocalNodeClient::new(state);
 
         Self {
@@ -124,6 +133,7 @@ where
             max_pending_messages,
             message_policy: MessagePolicy::new(BlanketMessagePolicy::Accept, None),
             cross_chain_message_delivery,
+            tracked_chains,
             notifier: Arc::new(Notifier::default()),
             storage,
         }
@@ -141,6 +151,15 @@ where
         &self.local_node
     }
 
+    #[tracing::instrument(level = "trace", skip(self))]
+    /// Adds a chain to the set of chains tracked by the local node.
+    pub fn track_chain(&self, chain_id: ChainId) {
+        self.tracked_chains
+            .write()
+            .expect("Panics should not happen while holding a lock to `tracked_chains`")
+            .insert(chain_id);
+    }
+
     #[tracing::instrument(level = "trace", skip_all, fields(chain_id, next_block_height))]
     /// Creates a new `ChainClient`.
     #[allow(clippy::too_many_arguments)]
@@ -2501,6 +2520,12 @@ where
                     executed_block.message_id_for_operation(0, OPEN_CHAIN_MESSAGE_INDEX)
                 })
                 .ok_or_else(|| ChainClientError::InternalError("Failed to create new chain"))?;
+            // Add the new chain to the list of tracked chains
+            self.client.track_chain(ChainId::child(message_id));
+            self.client
+                .local_node
+                .retry_pending_cross_chain_requests(self.chain_id)
+                .await?;
             return Ok(ClientOutcome::Committed((message_id, certificate)));
         }
     }
@@ -2791,6 +2816,16 @@ where
             .await
     }
 
+    #[tracing::instrument(level = "trace")]
+    /// Handles any cross-chain requests for any pending outgoing messages.
+    pub async fn retry_pending_outgoing_messages(&self) -> Result<(), ChainClientError> {
+        self.client
+            .local_node
+            .retry_pending_cross_chain_requests(self.chain_id)
+            .await?;
+        Ok(())
+    }
+
     #[tracing::instrument(level = "trace", skip(from, limit))]
     pub async fn read_hashed_certificate_values_downward(
         &self,

linera-core/src/local_node.rs

@@ -4,7 +4,7 @@
 
 use std::{
     borrow::Cow,
-    collections::{HashMap, HashSet},
+    collections::{HashMap, HashSet, VecDeque},
     sync::Arc,
 };
 
@@ -570,4 +570,23 @@ where
             }
         }
     }
+
+    /// Handles any pending local cross-chain requests.
+    #[tracing::instrument(level = "trace", skip(self))]
+    pub async fn retry_pending_cross_chain_requests(
+        &self,
+        sender_chain: ChainId,
+    ) -> Result<(), LocalNodeError> {
+        let (_response, actions) = self
+            .node
+            .state
+            .handle_chain_info_query(ChainInfoQuery::new(sender_chain))
+            .await?;
+        let mut requests = VecDeque::from_iter(actions.cross_chain_requests);
+        while let Some(request) = requests.pop_front() {
+            let new_actions = self.node.state.handle_cross_chain_request(request).await?;
+            requests.extend(new_actions.cross_chain_requests);
+        }
+        Ok(())
+    }
 }

linera-core/src/unit_tests/test_utils.rs

@@ -796,6 +796,7 @@ where
             storage,
             10,
             CrossChainMessageDelivery::NonBlocking,
+            [chain_id],
         ));
         Ok(builder.create_chain_client(
             chain_id,

linera-core/src/worker.rs

@@ -4,9 +4,9 @@
 
 use std::{
     borrow::Cow,
-    collections::{hash_map, BTreeMap, HashMap, VecDeque},
+    collections::{hash_map, BTreeMap, HashMap, HashSet, VecDeque},
     num::NonZeroUsize,
-    sync::{Arc, LazyLock, Mutex},
+    sync::{Arc, LazyLock, Mutex, RwLock},
     time::Duration,
 };
 
@@ -235,6 +235,8 @@ where
     recent_hashed_certificate_values: Arc<ValueCache<CryptoHash, HashedCertificateValue>>,
     /// Cached blobs by `BlobId`.
     recent_blobs: Arc<ValueCache<BlobId, Blob>>,
+    /// Chain IDs that should be tracked by a worker.
+    tracked_chains: Option<Arc<RwLock<HashSet<ChainId>>>>,
     /// One-shot channels to notify callers when messages of a particular chain have been
     /// delivered.
     delivery_notifiers: Arc<Mutex<DeliveryNotifiers>>,
@@ -264,15 +266,30 @@ where
             chain_worker_config: ChainWorkerConfig::default().with_key_pair(key_pair),
             recent_hashed_certificate_values: Arc::new(ValueCache::default()),
             recent_blobs: Arc::new(ValueCache::default()),
+            tracked_chains: None,
             delivery_notifiers: Arc::default(),
             chain_worker_tasks: Arc::default(),
             chain_workers: Arc::new(Mutex::new(LruCache::new(*CHAIN_WORKER_LIMIT))),
         }
     }
 
     #[tracing::instrument(level = "trace", skip(nickname, storage))]
-    pub fn new_for_client(nickname: String, storage: StorageClient) -> Self {
-        Self::new(nickname, None, storage)
+    pub fn new_for_client(
+        nickname: String,
+        storage: StorageClient,
+        tracked_chains: Arc<RwLock<HashSet<ChainId>>>,
+    ) -> Self {
+        WorkerState {
+            nickname,
+            storage,
+            chain_worker_config: ChainWorkerConfig::default(),
+            recent_hashed_certificate_values: Arc::new(ValueCache::default()),
+            recent_blobs: Arc::new(ValueCache::default()),
+            tracked_chains: Some(tracked_chains),
+            delivery_notifiers: Arc::default(),
+            chain_worker_tasks: Arc::default(),
+            chain_workers: Arc::new(Mutex::new(LruCache::new(*CHAIN_WORKER_LIMIT))),
+        }
     }
 
     #[tracing::instrument(level = "trace", skip(self, value))]
@@ -288,6 +305,15 @@ where
         self
     }
 
+    /// Configures the subset of chains that this worker is tracking.
+    pub fn with_tracked_chains(
+        mut self,
+        tracked_chains: impl IntoIterator<Item = ChainId>,
+    ) -> Self {
+        self.tracked_chains = Some(Arc::new(RwLock::new(tracked_chains.into_iter().collect())));
+        self
+    }
+
     /// Returns an instance with the specified grace period, in microseconds.
     ///
     /// Blocks with a timestamp this far in the future will still be accepted, but the validator
@@ -665,6 +691,7 @@ where
                 self.storage.clone(),
                 self.recent_hashed_certificate_values.clone(),
                 self.recent_blobs.clone(),
+                self.tracked_chains.clone(),
                 chain_id,
             )
             .await?;

linera-service/src/linera/main.rs

@@ -1100,6 +1100,7 @@ impl Job {
         ViewError: From<S::StoreError>,
     {
         let state = WorkerState::new("Local node".to_string(), None, storage)
+            .with_tracked_chains([message_id.chain_id, chain_id])
             .with_allow_inactive_chains(true)
             .with_allow_messages_from_deprecated_epochs(true);
         let node_client = LocalNodeClient::new(state);