Add standard storage mode and improve back-sync handling (30):

Store modes and back-sync:

- Back-sync blocks to `Config::min_epochs_for_block_requests` in standard
  storage mode
- Back-sync blob sidecars to `Config::min_epochs_for_blob_sidecars_requests`
- Track & filter peers that don't serve blocks prior to
  `Config::min_epochs_for_block_requests` when performing full back-sync
- Remove `Feature::TrustBackSyncBlocks`
- Verify signatures of back-synced blocks
- Move back-sync status to `Store`
- Relocate `received_blob_sidecars` and `received_block_roots` caches from `p2p::Network` to `p2p::BlockSyncService`
- Extend `SyncBatch` with `retry_count` and `responses_received` fields
- Use smaller back-sync batches when syncing with blobs
- Don't validate signature of genesis block
- Track state archival progress in database to be able to resume it
  after restart
- Don't request data from busy peers

DB:

- Add db-info command to inspect the Sync database
- Replace read-only boolean flag with more descriptive `DatabaseMode` enum

Other:

- Panic to trigger app-restart if network thread is down
- Handle exit signal in an archiver thread & batch archiver updates to db
- Rename `RequestType` to `RPCRequestType` as it conflicts with updated `eth2_libp2p`
- Log peer reporting in debug log
- Log minimal back-sync info when starting back-sync
- Don't log RPC received blocks to info logs (too much output during syncing)

benches/benches/fork_choice_store.rs

@@ -69,6 +69,7 @@ impl Criterion {
                     anchor_block,
                     anchor_state,
                     false,
+                    false,
                 );
 
                 for slot in (anchor_slot + 1)..=last_attestation_slot {

database/src/lib.rs

@@ -20,21 +20,56 @@ use unwrap_none::UnwrapNone as _;
 const GROWTH_STEP: ByteSize = ByteSize::mib(256);
 const MAX_NAMED_DATABASES: usize = 10;
 
+#[derive(Clone, Copy)]
+pub enum DatabaseMode {
+    ReadOnly,
+    ReadWrite,
+}
+
+impl DatabaseMode {
+    #[must_use]
+    pub const fn is_read_only(self) -> bool {
+        matches!(self, Self::ReadOnly)
+    }
+
+    #[must_use]
+    pub const fn mode_permissions(self) -> u16 {
+        match self {
+            // <https://erthink.github.io/libmdbx/group__c__opening.html#gabb7dd3b10dd31639ba252df545e11768>
+            // The UNIX permissions to set on created files. Zero value means to open existing, but do not create.
+            Self::ReadOnly => 0,
+            Self::ReadWrite => 0o600,
+        }
+    }
+
+    #[must_use]
+    #[cfg(target_os = "linux")]
+    pub fn permissions(self) -> u32 {
+        self.mode_permissions().into()
+    }
+
+    #[must_use]
+    #[cfg(not(target_os = "linux"))]
+    pub const fn permissions(self) -> u16 {
+        self.mode_permissions()
+    }
+}
+
 pub struct Database(DatabaseKind);
 
 impl Database {
     pub fn persistent(
         name: &str,
         directory: impl AsRef<Path>,
         max_size: ByteSize,
-        read_only: bool,
+        mode: DatabaseMode,
     ) -> Result<Self> {
         // If a database with the legacy name exists, keep using it.
         // Otherwise, create a new database with the specified name.
         // This check will not force existing users to resync.
         let legacy_name = directory.as_ref().to_str().ok_or(Error)?;
 
-        if !read_only {
+        if !mode.is_read_only() {
             fs_err::create_dir_all(&directory)?;
         }
 
@@ -48,14 +83,14 @@ impl Database {
                 shrink_threshold: None,
                 page_size: None,
             })
-            .open_with_permissions(directory.as_ref(), 0o600)?;
+            .open_with_permissions(directory.as_ref(), mode.permissions())?;
 
         let transaction = environment.begin_rw_txn()?;
         let existing_db = transaction.open_db(Some(legacy_name));
 
         let database_name = if existing_db.is_err() {
             info!("database: {legacy_name} with name {name}");
-            if !read_only {
+            if !mode.is_read_only() {
                 transaction.create_db(Some(name), DatabaseFlags::default())?;
             }
 
@@ -753,7 +788,13 @@ mod tests {
     }
 
     fn build_persistent_database() -> Result<Database> {
-        let database = Database::persistent("test_db", TempDir::new()?, ByteSize::mib(1), false)?;
+        let database = Database::persistent(
+            "test_db",
+            TempDir::new()?,
+            ByteSize::mib(1),
+            DatabaseMode::ReadWrite,
+        )?;
+
         populate_database(&database)?;
         Ok(database)
     }

features/src/lib.rs

@@ -41,7 +41,6 @@ pub enum Feature {
     SubscribeToAllAttestationSubnets,
     SubscribeToAllSyncCommitteeSubnets,
     TrackMetrics,
-    TrustBackSyncBlocks,
     // By default we fully validate objects produced by the current instance of the application.
     // This costs some resources but may help in case of bugs.
     TrustOwnAttestationSignatures,

fork_choice_control/src/controller.rs

@@ -8,7 +8,7 @@
 // The downside is that submitting the same object multiple times in quick succession will result in
 // it being processed multiple times in parallel redundantly.
 
-use core::panic::AssertUnwindSafe;
+use core::{panic::AssertUnwindSafe, sync::atomic::AtomicBool};
 use std::{
     sync::{mpsc::Sender, Arc},
     thread::{Builder, JoinHandle},
@@ -106,6 +106,7 @@ where
         validator_tx: impl UnboundedSink<ValidatorMessage<P, W>>,
         storage: Arc<Storage<P>>,
         unfinalized_blocks: impl DoubleEndedIterator<Item = Result<Arc<SignedBeaconBlock<P>>>>,
+        finished_back_sync: bool,
     ) -> Result<(Arc<Self>, MutatorHandle<P, W>)> {
         let finished_initial_forward_sync = anchor_block.message().slot() >= tick.slot;
 
@@ -115,6 +116,7 @@ where
             anchor_block,
             anchor_state,
             finished_initial_forward_sync,
+            finished_back_sync,
         );
 
         store.apply_tick(tick)?;
@@ -198,6 +200,14 @@ where
         .send(&self.mutator_tx)
     }
 
+    pub fn on_back_sync_status(&self, is_back_synced: bool) {
+        MutatorMessage::BackSyncStatus {
+            wait_group: self.owned_wait_group(),
+            is_back_synced,
+        }
+        .send(&self.mutator_tx)
+    }
+
     pub fn on_gossip_block(&self, block: Arc<SignedBeaconBlock<P>>, gossip_id: GossipId) {
         self.spawn_block_task(block, BlockOrigin::Gossip(gossip_id))
     }
@@ -435,6 +445,13 @@ where
         })
     }
 
+    pub fn store_back_sync_blob_sidecars(
+        &self,
+        blob_sidecars: impl IntoIterator<Item = Arc<BlobSidecar<P>>>,
+    ) -> Result<()> {
+        self.storage.store_back_sync_blob_sidecars(blob_sidecars)
+    }
+
     pub fn store_back_sync_blocks(
         &self,
         blocks: impl IntoIterator<Item = Arc<SignedBeaconBlock<P>>>,
@@ -447,9 +464,14 @@ where
         start_slot: Slot,
         end_slot: Slot,
         anchor_checkpoint_provider: &AnchorCheckpointProvider<P>,
+        is_exiting: &Arc<AtomicBool>,
     ) -> Result<()> {
-        self.storage
-            .archive_back_sync_states(start_slot, end_slot, anchor_checkpoint_provider)
+        self.storage.archive_back_sync_states(
+            start_slot,
+            end_slot,
+            anchor_checkpoint_provider,
+            is_exiting,
+        )
     }
 
     fn spawn_blob_sidecar_task(

fork_choice_control/src/lib.rs

@@ -21,14 +21,16 @@ pub use crate::{
         AttestationVerifierMessage, P2pMessage, PoolMessage, SubnetMessage, SyncMessage,
         ValidatorMessage,
     },
-    misc::{MutatorRejectionReason, VerifyAggregateAndProofResult, VerifyAttestationResult},
+    misc::{
+        MutatorRejectionReason, StorageMode, VerifyAggregateAndProofResult, VerifyAttestationResult,
+    },
     queries::{BlockWithRoot, ForkChoiceContext, ForkTip, Snapshot},
     specialized::{AdHocBenchController, BenchController},
     storage::{
-        BlobSidecarByBlobId, BlockCheckpoint, BlockRootBySlot, FinalizedBlockByRoot, PrefixableKey,
-        SlotBlobId, SlotByStateRoot, StateByBlockRoot, StateCheckpoint, UnfinalizedBlockByRoot,
+        get, save, BlobSidecarByBlobId, BlockCheckpoint, BlockRootBySlot, FinalizedBlockByRoot,
+        PrefixableKey, SlotBlobId, SlotByStateRoot, StateByBlockRoot, StateCheckpoint,
+        StateLoadStrategy, Storage, UnfinalizedBlockByRoot, DEFAULT_ARCHIVAL_EPOCH_INTERVAL,
     },
-    storage::{StateLoadStrategy, Storage, DEFAULT_ARCHIVAL_EPOCH_INTERVAL},
     storage_tool::{export_state_and_blocks, replay_blocks},
     wait::Wait,
 };

fork_choice_control/src/messages.rs

@@ -67,6 +67,10 @@ pub enum MutatorMessage<P: Preset, W> {
         wait_group: W,
         tick: Tick,
     },
+    BackSyncStatus {
+        wait_group: W,
+        is_back_synced: bool,
+    },
     Block {
         wait_group: W,
         result: Result<BlockAction<P>>,

fork_choice_control/src/misc.rs

@@ -120,3 +120,22 @@ pub enum MutatorRejectionReason {
     InvalidBlock,
     InvalidBlobSidecar,
 }
+
+#[derive(Clone, Copy, Debug)]
+pub enum StorageMode {
+    Prune,
+    Standard,
+    Archive,
+}
+
+impl StorageMode {
+    #[must_use]
+    pub const fn is_prune(self) -> bool {
+        matches!(self, Self::Prune)
+    }
+
+    #[must_use]
+    pub const fn is_archive(self) -> bool {
+        matches!(self, Self::Archive)
+    }
+}

fork_choice_control/src/mutator.rs

@@ -190,6 +190,10 @@ where
                 .expect("sender in Controller is not dropped until mutator thread exits")
             {
                 MutatorMessage::Tick { wait_group, tick } => self.handle_tick(&wait_group, tick)?,
+                MutatorMessage::BackSyncStatus {
+                    wait_group,
+                    is_back_synced,
+                } => self.handle_back_sync_status(wait_group, is_back_synced),
                 MutatorMessage::Block {
                     wait_group,
                     result,
@@ -439,7 +443,10 @@ where
             self.spawn_preprocess_head_state_for_next_slot_task();
         }
 
-        if self.store.is_forward_synced() && misc::slots_since_epoch_start::<P>(tick.slot) == 0 {
+        if self.store.is_forward_synced()
+            && self.store.is_back_synced()
+            && misc::slots_since_epoch_start::<P>(tick.slot) == 0
+        {
             if tick.kind == TickKind::AttestFourth {
                 self.prune_old_records()?;
             }
@@ -467,6 +474,15 @@ where
         Ok(())
     }
 
+    fn handle_back_sync_status(&mut self, wait_group: W, is_back_synced: bool) {
+        if self.store.is_back_synced() != is_back_synced {
+            self.store_mut().set_back_synced(is_back_synced);
+            self.update_store_snapshot();
+        }
+
+        drop(wait_group);
+    }
+
     #[expect(clippy::too_many_lines)]
     fn handle_block(
         &mut self,
@@ -1636,13 +1652,15 @@ where
         self.event_channels
             .send_blob_sidecar_event(block_root, blob_sidecar);
 
-        self.spawn(PersistBlobSidecarsTask {
-            store_snapshot: self.owned_store(),
-            storage: self.storage.clone_arc(),
-            mutator_tx: self.owned_mutator_tx(),
-            wait_group: wait_group.clone(),
-            metrics: self.metrics.clone(),
-        });
+        if !self.storage.prune_storage_enabled() {
+            self.spawn(PersistBlobSidecarsTask {
+                store_snapshot: self.owned_store(),
+                storage: self.storage.clone_arc(),
+                mutator_tx: self.owned_mutator_tx(),
+                wait_group: wait_group.clone(),
+                metrics: self.metrics.clone(),
+            });
+        }
 
         self.handle_potential_head_change(wait_group, &old_head, head_was_optimistic);
     }
@@ -2337,6 +2355,10 @@ where
     }
 
     fn prune_old_records(&self) -> Result<()> {
+        if self.storage.archive_storage_enabled() {
+            return Ok(());
+        }
+
         let storage = self.storage.clone_arc();
         let blobs_up_to_epoch = self.store.min_checked_data_availability_epoch();
         let blobs_up_to_slot = misc::compute_start_slot_at_epoch::<P>(blobs_up_to_epoch);
@@ -2376,7 +2398,9 @@ where
 
                 match storage.prune_old_state_roots(blocks_up_to_slot) {
                     Ok(()) => {
-                        debug!("pruned old state roots from storage up to slot {blocks_up_to_slot}");
+                        debug!(
+                            "pruned old state roots from storage up to slot {blocks_up_to_slot}"
+                        );
                     }
                     Err(error) => {
                         error!("pruning old state roots from storage failed: {error:?}")