fix: return reverted field of logs set to true if tipset was reverted

CHANGELOG.md

@@ -41,6 +41,8 @@
 
 ### Fixed
 
+- [#7096](https://github.com/ChainSafe/forest/issues/7096): `eth_subscribe` `logs` now re-emits the logs of reorg-reverted tipsets with `removed: true`, ahead of the logs of the replacing tipsets.
+
 - [#7129](https://github.com/ChainSafe/forest/pull/7129): Fixed a few inaccurate cache size metrics.
 
 - [#6974](https://github.com/ChainSafe/forest/issues/6974): Fixed the message pool reporting a still-pending nonce as the next nonce after an applied message was removed.

src/daemon/mod.rs

@@ -600,6 +600,7 @@ fn maybe_start_rpc_service(
                         bad_blocks,
                         sync_status,
                         eth_event_handler,
+                        eth_logs_feed: Default::default(),
                         sync_network_context,
                         start_time,
                         shutdown,

src/rpc/methods/chain.rs

@@ -1551,6 +1551,14 @@ impl<T: Clone> Clone for PathChange<T> {
     }
 }
 
+impl<T> PathChange<T> {
+    pub fn tipset(&self) -> &T {
+        match self {
+            Self::Revert(ts) | Self::Apply(ts) => ts,
+        }
+    }
+}
+
 impl HasLotusJson for PathChange {
     type LotusJson = PathChange<<Tipset as HasLotusJson>::LotusJson>;
 

src/rpc/methods/eth.rs

@@ -35,10 +35,13 @@ use crate::rpc::{
     error::ServerError,
     eth::{
         errors::EthErrors,
-        filter::{SkipEvent, event::EventFilter, mempool::MempoolFilter, tipset::TipSetFilter},
+        filter::{
+            EventRevertStatus, SkipEvent, event::EventFilter, mempool::MempoolFilter,
+            tipset::TipSetFilter,
+        },
         utils::decode_revert_reason,
     },
-    methods::chain::ChainGetTipSetV2,
+    methods::chain::{ChainGetTipSetV2, PathChange},
     state::ApiInvocResult,
     types::{ApiTipsetKey, EventEntry, MessageLookup},
 };
@@ -1410,17 +1413,35 @@ pub async fn eth_logs_for_block_and_transaction(
     eth_filter_logs_from_events(ctx, &events)
 }
 
-pub async fn eth_logs_with_filter(
+/// Collects the logs produced by a single chain head change, for the logs
+/// subscription.
+pub(in crate::rpc) async fn eth_logs_for_head_change(
     ctx: &Ctx,
-    ts: &Tipset,
-    spec: Option<EthFilterSpec>,
+    change: &PathChange<Tipset>,
 ) -> anyhow::Result<Vec<EthLog>> {
+    let (receipt_ts, revert_status) = match change {
+        PathChange::Revert(ts) => (ts, EventRevertStatus::Reverted),
+        PathChange::Apply(ts) => (ts, EventRevertStatus::Applied),
+    };
+    // Genesis carries no events and has no parent message tipset to load.
+    if receipt_ts.epoch() == 0 {
+        return Ok(vec![]);
+    }
+    let msg_ts = ctx
+        .chain_index()
+        .load_required_tipset(receipt_ts.parents())?;
+    let executed_ts = ctx
+        .state_manager
+        .load_executed_tipset_with_receipt(&msg_ts, receipt_ts)
+        .await?;
     let mut events = vec![];
-    EthEventHandler::collect_events(
+    EthEventHandler::collect_events_from_messages(
         &ctx.state_manager,
-        ts,
-        spec.as_ref(),
+        &msg_ts,
+        &executed_ts.executed_messages,
+        None::<&ParsedFilter>,
         SkipEvent::OnUnresolvedAddress,
+        revert_status,
         &mut events,
     )
     .await?;
@@ -3036,6 +3057,11 @@ pub struct CollectedEvent {
     pub(crate) msg_cid: Cid,
 }
 
+/// Positions `(message index, event index)` of collected events, grouped by tipset.
+/// Identifies events without retaining their entry payloads; grouping by tipset lets
+/// membership checks borrow the tipset key and stores each distinct key only once.
+pub type SeenEventPositions = HashMap<TipsetKey, HashSet<(u64, u64)>>;
+
 fn match_key(key: &str) -> Option<usize> {
     match key.get(0..2) {
         Some("t1") => Some(0),
@@ -3297,6 +3323,54 @@ impl RpcMethod<1> for EthGetLogs {
     }
 }
 
+/// Shared implementation of `eth_getFilterLogs` / `eth_getFilterChanges` for installed event
+/// filters: collects the filter's full result set from the canonical chain, returns only the
+/// events that were not present in the previous poll.
+async fn poll_event_filter(
+    ctx: &Ctx,
+    event_filter: &EventFilter,
+) -> anyhow::Result<Vec<CollectedEvent>> {
+    let events = ctx
+        .eth_event_handler
+        .get_events_for_parsed_filter(
+            ctx,
+            &Arc::new(event_filter.into()),
+            SkipEvent::OnUnresolvedAddress,
+        )
+        .await?;
+    let mut seen_positions = SeenEventPositions::default();
+    let mut recent_events = Vec::new();
+    for event in events {
+        let position = (event.msg_idx, event.event_idx);
+        let already_seen = event_filter
+            .seen_positions
+            .get(&event.tipset_key)
+            .is_some_and(|positions| positions.contains(&position));
+        match seen_positions.get_mut(&event.tipset_key) {
+            Some(positions) => {
+                positions.insert(position);
+            }
+            None => {
+                seen_positions.insert(event.tipset_key.clone(), HashSet::from_iter([position]));
+            }
+        }
+        if !already_seen {
+            recent_events.push(event);
+        }
+    }
+    if let Some(store) = &ctx.eth_event_handler.filter_store {
+        store.update(Arc::new(EventFilter {
+            id: event_filter.id.clone(),
+            tipsets: event_filter.tipsets.clone(),
+            addresses: event_filter.addresses.clone(),
+            keys_with_codec: event_filter.keys_with_codec.clone(),
+            max_results: event_filter.max_results,
+            seen_positions,
+        }));
+    }
+    Ok(recent_events)
+}
+
 pub enum EthGetFilterLogs {}
 impl RpcMethod<1> for EthGetFilterLogs {
     const NAME: &'static str = "Filecoin.EthGetFilterLogs";
@@ -3316,28 +3390,7 @@ impl RpcMethod<1> for EthGetFilterLogs {
         if let Some(store) = &eth_event_handler.filter_store {
             let filter = store.get(&filter_id)?;
             if let Some(event_filter) = filter.as_any().downcast_ref::<EventFilter>() {
-                let events = ctx
-                    .eth_event_handler
-                    .get_events_for_parsed_filter(
-                        &ctx,
-                        &Arc::new(event_filter.into()),
-                        SkipEvent::OnUnresolvedAddress,
-                    )
-                    .await?;
-                let recent_events: Vec<CollectedEvent> = events
-                    .clone()
-                    .into_iter()
-                    .filter(|event| !event_filter.collected.contains(event))
-                    .collect();
-                let filter = Arc::new(EventFilter {
-                    id: event_filter.id.clone(),
-                    tipsets: event_filter.tipsets.clone(),
-                    addresses: event_filter.addresses.clone(),
-                    keys_with_codec: event_filter.keys_with_codec.clone(),
-                    max_results: event_filter.max_results,
-                    collected: events.clone(),
-                });
-                store.update(filter);
+                let recent_events = poll_event_filter(&ctx, event_filter).await?;
                 return Ok(eth_filter_result_from_events(&ctx, &recent_events)?);
             }
         }
@@ -3367,28 +3420,7 @@ impl RpcMethod<1> for EthGetFilterChanges {
         if let Some(store) = &eth_event_handler.filter_store {
             let filter = store.get(&filter_id)?;
             if let Some(event_filter) = filter.as_any().downcast_ref::<EventFilter>() {
-                let events = ctx
-                    .eth_event_handler
-                    .get_events_for_parsed_filter(
-                        &ctx,
-                        &Arc::new(event_filter.into()),
-                        SkipEvent::OnUnresolvedAddress,
-                    )
-                    .await?;
-                let recent_events: Vec<CollectedEvent> = events
-                    .clone()
-                    .into_iter()
-                    .filter(|event| !event_filter.collected.contains(event))
-                    .collect();
-                let filter = Arc::new(EventFilter {
-                    id: event_filter.id.clone(),
-                    tipsets: event_filter.tipsets.clone(),
-                    addresses: event_filter.addresses.clone(),
-                    keys_with_codec: event_filter.keys_with_codec.clone(),
-                    max_results: event_filter.max_results,
-                    collected: events.clone(),
-                });
-                store.update(filter);
+                let recent_events = poll_event_filter(&ctx, event_filter).await?;
                 return Ok(eth_filter_result_from_events(&ctx, &recent_events)?);
             }
             if let Some(tipset_filter) = filter.as_any().downcast_ref::<TipSetFilter>() {

src/rpc/methods/eth/filter/event.rs

@@ -3,7 +3,7 @@
 
 use crate::prelude::*;
 use crate::rpc::eth::filter::{ActorEventBlock, ParsedFilter, ParsedFilterTipsets};
-use crate::rpc::eth::{CollectedEvent, FilterID, filter::Filter};
+use crate::rpc::eth::{FilterID, SeenEventPositions, filter::Filter};
 use crate::shim::address::Address;
 use ahash::HashMap;
 use anyhow::Result;
@@ -22,8 +22,8 @@ pub struct EventFilter {
     pub keys_with_codec: HashMap<String, Vec<ActorEventBlock>>,
     // Maximum number of results to collect
     pub max_results: usize,
-    // Collected events
-    pub collected: Vec<CollectedEvent>,
+    // Positions of the events returned by the last poll, used to compute the next poll's delta
+    pub seen_positions: SeenEventPositions,
 }
 
 impl From<&EventFilter> for ParsedFilter {
@@ -72,7 +72,7 @@ impl EventFilterManager {
             addresses: pf.addresses,
             keys_with_codec: pf.keys,
             max_results: self.max_filter_results,
-            collected: vec![],
+            seen_positions: Default::default(),
         });
 
         self.filters.write().insert(id, filter.clone());