Initialise event index in di

chain/events/filter/event.go

@@ -306,6 +306,12 @@ func (m *EventFilterManager) Apply(ctx context.Context, from, to *types.TipSet)
 		load:  m.loadExecutedMessages,
 	}
 
+	if m.EventIndex != nil {
+		if err := m.EventIndex.CollectEvents(ctx, tse, false, m.AddressResolver); err != nil {
+			return err
+		}
+	}
+
 	// TODO: could run this loop in parallel with errgroup if there are many filters
 	for _, f := range m.filters {
 		if err := f.CollectEvents(ctx, tse, false, m.AddressResolver); err != nil {
@@ -331,6 +337,12 @@ func (m *EventFilterManager) Revert(ctx context.Context, from, to *types.TipSet)
 		load:  m.loadExecutedMessages,
 	}
 
+	if m.EventIndex != nil {
+		if err := m.EventIndex.CollectEvents(ctx, tse, true, m.AddressResolver); err != nil {
+			return err
+		}
+	}
+
 	// TODO: could run this loop in parallel with errgroup if there are many filters
 	for _, f := range m.filters {
 		if err := f.CollectEvents(ctx, tse, true, m.AddressResolver); err != nil {
@@ -346,7 +358,7 @@ func (m *EventFilterManager) Install(ctx context.Context, minHeight, maxHeight a
 	currentHeight := m.currentHeight
 	m.mu.Unlock()
 
-	if m.EventIndex == nil && (minHeight < currentHeight || maxHeight < currentHeight) {
+	if m.EventIndex == nil && minHeight < currentHeight {
 		return nil, xerrors.Errorf("historic event index disabled")
 	}
 
@@ -365,7 +377,8 @@ func (m *EventFilterManager) Install(ctx context.Context, minHeight, maxHeight a
 		maxResults: m.MaxFilterResults,
 	}
 
-	if m.EventIndex != nil && (minHeight < currentHeight || maxHeight < currentHeight) {
+	if m.EventIndex != nil && minHeight < currentHeight {
+		// Filter needs historic events
 		if err := m.EventIndex.PrefillFilter(ctx, f); err != nil {
 			return nil, err
 		}

chain/events/filter/index.go

@@ -50,7 +50,7 @@ var ddls = []string{
 		value BLOB NOT NULL
 	)`,
 
-	// placeholder version to enable migrations.
+	// metadata containing version of schema
 	`CREATE TABLE IF NOT EXISTS _meta (
     	version UINT64 NOT NULL UNIQUE
 	)`,

node/config/types.go

@@ -624,6 +624,11 @@ type ActorEventConfig struct {
 	// the entire chain)
 	MaxFilterHeightRange uint64
 
+	// EventHistoryDatabasePath is the full path to a sqlite database that will be used to index actor events to
+	// support the historic filter APIs. If the database does not exist it will be created. The directory containing
+	// the database must already exist and be writeable.
+	ActorEventDatabasePath string
+
 	// Others, not implemented yet:
 	// Set a limit on the number of active websocket subscriptions (may be zero)
 	// Set a timeout for subscription clients

node/modules/actorevent.go

@@ -38,8 +38,9 @@ func EthEventAPI(cfg config.ActorEventConfig) func(helpers.MetricsCtx, fx.Lifecy
 			MaxFilterHeightRange: abi.ChainEpoch(cfg.MaxFilterHeightRange),
 		}
 
-		if !cfg.EnableRealTimeFilterAPI && !cfg.EnableHistoricFilterAPI {
+		if !cfg.EnableRealTimeFilterAPI {
 			// all event functionality is disabled
+			// the historic filter API relies on the real time one
 			return ee, nil
 		}
 
@@ -53,9 +54,25 @@ func EthEventAPI(cfg config.ActorEventConfig) func(helpers.MetricsCtx, fx.Lifecy
 			},
 		})
 
-		if cfg.EnableRealTimeFilterAPI {
+		// Enable indexing of actor events
+		var eventIndex *filter.EventIndex
+		if cfg.EnableHistoricFilterAPI {
+			var err error
+			eventIndex, err = filter.NewEventIndex(cfg.ActorEventDatabasePath)
+			if err != nil {
+				return nil, err
+			}
+
+			lc.Append(fx.Hook{
+				OnStop: func(ctx context.Context) error {
+					return eventIndex.Close()
+				},
+			})
+		}
+
 		ee.EventFilterManager = &filter.EventFilterManager{
 			ChainStore: cs,
+			EventIndex: eventIndex, // will be nil unless EnableHistoricFilterAPI is true
 			AddressResolver: func(ctx context.Context, emitter abi.ActorID, ts *types.TipSet) (address.Address, bool) {
 				// we only want to match using f4 addresses
 				idAddr, err := address.NewIDAddress(uint64(emitter))
@@ -109,12 +126,6 @@ func EthEventAPI(cfg config.ActorEventConfig) func(helpers.MetricsCtx, fx.Lifecy
 			},
 		})
 
-		}
-
-		if cfg.EnableHistoricFilterAPI {
-			// TODO: enable indexer
-		}
-
 		return ee, nil
 	}
 }