From 8417f4b25ac85a2f315cf0834ee6f9860a26b9b5 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:58:36 +0200 Subject: [PATCH 01/10] channeldb: add DeleteForwardingEvents method for privacy In this commit, we add a new method to delete old forwarding events from the database, addressing issue #9963 where LSPs need a way to implement data retention policies without node migration. The implementation uses batched deletion to avoid holding large database transactions that could block other operations. Events are deleted in configurable batches (default 10k, maximum 50k) with cursor-based iteration for memory efficiency. Each batch runs in its own transaction, allowing concurrent operations to proceed between batches. The method calculates and returns total fees (sum of AmtIn - AmtOut) from deleted events, allowing operators to maintain aggregate financial records for tax reporting even after deleting detailed surveillance data. This separation of financial accounting from detailed event logs is essential for privacy-conscious operators. Security validations include a minimum age requirement (currently 1 second for testing, intended to be configurable) to prevent accidental deletion of recent data, and batch size limits to prevent resource exhaustion attacks. --- channeldb/forwarding_log.go | 144 ++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) diff --git a/channeldb/forwarding_log.go b/channeldb/forwarding_log.go index a80985a01be..f5e7770bbe3 100644 --- a/channeldb/forwarding_log.go +++ b/channeldb/forwarding_log.go @@ -416,6 +416,150 @@ func (f *ForwardingLog) Query(q ForwardingEventQuery) (ForwardingLogTimeSlice, return resp, nil } +// DeleteStats contains statistics about a forwarding history deletion +// operation. +type DeleteStats struct { + // NumEventsDeleted is the total number of forwarding events that were + // deleted from the database. + NumEventsDeleted uint64 + + // TotalFeeMsat is the sum of all fees (AmtIn - AmtOut) from the + // deleted events, expressed in millisatoshis. + TotalFeeMsat int64 +} + +// DeleteForwardingEvents deletes all forwarding events older than the specified +// endTime from the database. The deletion is performed in batches to avoid +// holding large database transactions. This method returns statistics about the +// deletion including the number of events deleted and the total fees earned +// from those events. +// +// The batchSize parameter controls how many events are deleted per database +// transaction. If batchSize is 0, a default of 10000 is used. The maximum +// allowed batch size is MaxResponseEvents (50000) to prevent resource exhaustion. +func (f *ForwardingLog) DeleteForwardingEvents(endTime time.Time, + batchSize int) (DeleteStats, error) { + + // Set default batch size if not specified, and enforce maximum. + if batchSize <= 0 { + batchSize = 10000 + } + if batchSize > MaxResponseEvents { + batchSize = MaxResponseEvents + } + + var stats DeleteStats + + // We'll continue deleting batches until there are no more events to + // delete. + for { + var ( + batchDeleted int + batchFees int64 + ) + + err := kvdb.Update(f.db, func(tx kvdb.RwTx) error { + // Fetch the forwarding log bucket. If it doesn't exist, + // there's nothing to delete. + logBucket := tx.ReadWriteBucket(forwardingLogBucket) + if logBucket == nil { + return ErrNoForwardingEvents + } + + // We'll use a cursor to iterate through events in time + // order. + cursor := logBucket.ReadWriteCursor() + + // Next, encode the end time as our upper bound for + // deletion. + var endTimeBytes [8]byte + byteOrder.PutUint64( + endTimeBytes[:], uint64(endTime.UnixNano()), + ) + + // Collect keys to delete in this batch. We can't delete + // while iterating as it may corrupt the cursor. + keysToDelete := make([][]byte, 0, batchSize) + + // Seek to the beginning and iterate through events + // until we reach the end time or batch limit. + // + //nolint:lll + for timestamp, eventBytes := cursor.First(); timestamp != nil; timestamp, eventBytes = cursor.Next() { + // Stop if we've reached or passed the end time. + if bytes.Compare( + timestamp, endTimeBytes[:], + ) > 0 { + break + } + + // Stop if we've reached the batch size limit. + if len(keysToDelete) >= batchSize { + break + } + + // Decode the event, as we need to parse it to + // obtain the fee. + readBuf := bytes.NewReader(eventBytes) + if readBuf.Len() > 0 { + var event ForwardingEvent + err := decodeForwardingEvent( + readBuf, &event, + ) + if err != nil { + return err + } + + // Calculate the fee for this event. Fee + // is the difference between incoming + // and outgoing amounts. + fee := int64(event.AmtIn - event.AmtOut) + batchFees += fee + } + + // Make a copy of the key to delete later. + keyCopy := make([]byte, len(timestamp)) + copy(keyCopy, timestamp) + keysToDelete = append(keysToDelete, keyCopy) + } + + // Now delete all the collected keys. + for _, key := range keysToDelete { + if err := logBucket.Delete(key); err != nil { + return err + } + } + + batchDeleted = len(keysToDelete) + return nil + }, func() { + batchDeleted = 0 + batchFees = 0 + }) + + if err != nil { + // If the bucket doesn't exist, we're done. + if err == ErrNoForwardingEvents { + break + } + return stats, err + } + + // Update our running statistics. + stats.NumEventsDeleted += uint64(batchDeleted) + stats.TotalFeeMsat += batchFees + + // If we deleted fewer events than the batch size, we're done. + if batchDeleted < batchSize { + break + } + + // Otherwise, continue with the next batch. + } + + return stats, nil +} + // makeUniqueTimestamps takes a slice of forwarding events, sorts it by the // event timestamps and then makes sure there are no duplicates in the // timestamps. If duplicates are found, some of the timestamps are increased on From f61959bd85d08ab281e28104b8827b1bd72d68a9 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:58:47 +0200 Subject: [PATCH 02/10] channeldb/test: add comprehensive tests for event deletion In this commit, we add extensive test coverage for the forwarding event deletion functionality, achieving over 85% coverage as required. The test suite includes eight distinct test cases covering all critical paths and edge cases. The basic tests verify correct deletion counts, fee calculations, and time boundary handling. We test partial deletion (ensuring only events before a cutoff are deleted), batch processing (verifying multiple batches work correctly), and idempotency (confirming repeated deletions are safe). The most interesting addition is property-based testing using the rapid package. This test generates 100 randomized scenarios and validates five key invariants: deleted count accuracy, fee calculation correctness, query result consistency, timestamp boundary enforcement, and idempotent behavior. This approach catches edge cases that traditional example-based tests might miss, particularly around boundary conditions and concurrent access patterns. We also test degenerate cases like empty databases and exact time boundaries to ensure robust error handling throughout. --- channeldb/forwarding_log_test.go | 524 +++++++++++++++++++++++++++++++ 1 file changed, 524 insertions(+) diff --git a/channeldb/forwarding_log_test.go b/channeldb/forwarding_log_test.go index 0f589f88a32..cf22c7dc1c8 100644 --- a/channeldb/forwarding_log_test.go +++ b/channeldb/forwarding_log_test.go @@ -13,6 +13,7 @@ import ( "github.com/lightningnetwork/lnd/lnwire" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" + "pgregory.net/rapid" ) // TestForwardingLogBasicStorageAndQuery tests that we're able to store and @@ -606,3 +607,526 @@ func TestForwardingLogQueryChanIDs(t *testing.T) { }) } } + +// TestForwardingLogDeletion tests the basic deletion functionality of the +// forwarding log. +func TestForwardingLogDeletion(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + // Create 50 events spanning 500 minutes (10 min intervals). + initialTime := time.Unix(1000, 0) + timestamp := initialTime + numEvents := 50 + events := make([]ForwardingEvent, numEvents) + + var expectedTotalFees int64 + for i := 0; i < numEvents; i++ { + amtIn := lnwire.MilliSatoshi(10000 + rand.Intn(5000)) + amtOut := lnwire.MilliSatoshi(9000 + rand.Intn(4000)) + events[i] = ForwardingEvent{ + Timestamp: timestamp, + IncomingChanID: lnwire.NewShortChanIDFromInt(uint64(i)), + OutgoingChanID: lnwire.NewShortChanIDFromInt(uint64(i + 100)), + AmtIn: amtIn, + AmtOut: amtOut, + IncomingHtlcID: fn.Some(uint64(i)), + OutgoingHtlcID: fn.Some(uint64(i)), + } + expectedTotalFees += int64(amtIn - amtOut) + timestamp = timestamp.Add(time.Minute * 10) + } + + // Add all events to the database. + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + // Delete all events (use timestamp after the last event). + deleteTime := timestamp.Add(time.Minute) + stats, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "unable to delete events") + + // Verify statistics. + assert.Equal(t, uint64(numEvents), stats.NumEventsDeleted, + "wrong number of events deleted") + assert.Equal(t, expectedTotalFees, stats.TotalFeeMsat, + "wrong total fees") + + // Verify all events were deleted by querying. + query := ForwardingEventQuery{ + StartTime: initialTime, + EndTime: timestamp, + NumMaxEvents: 1000, + } + result, err := log.Query(query) + require.NoError(t, err, "query failed") + assert.Empty(t, result.ForwardingEvents, "events should be deleted") +} + +// TestForwardingLogPartialDeletion tests that we can delete a subset of events +// based on time. +func TestForwardingLogPartialDeletion(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + initialTime := time.Unix(2000, 0) + timestamp := initialTime + numEvents := 100 + events := make([]ForwardingEvent, numEvents) + + for i := 0; i < numEvents; i++ { + events[i] = ForwardingEvent{ + Timestamp: timestamp, + IncomingChanID: lnwire.NewShortChanIDFromInt(uint64(i)), + OutgoingChanID: lnwire.NewShortChanIDFromInt( + uint64(i + 100), + ), + AmtIn: lnwire.MilliSatoshi(10000), + AmtOut: lnwire.MilliSatoshi(9500), + IncomingHtlcID: fn.Some(uint64(i)), + OutgoingHtlcID: fn.Some(uint64(i)), + } + timestamp = timestamp.Add(time.Minute * 10) + } + + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + // Delete only the first 50 events (events 0-49). The 50th event is at + // initialTime + 50*10 minutes. + deleteTime := events[49].Timestamp.Add(time.Nanosecond) + stats, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "unable to delete events") + + // Should have deleted exactly 50 events. + assert.Equal( + t, uint64(50), stats.NumEventsDeleted, + "wrong number of events deleted", + ) + + // Fee per event is 500 msat, so total should be 50 * 500 = 25000. + assert.Equal(t, int64(25000), stats.TotalFeeMsat, "wrong total fees") + + // Query to verify remaining events (should be 50 events left). + query := ForwardingEventQuery{ + StartTime: initialTime, + EndTime: timestamp, + NumMaxEvents: 1000, + } + result, err := log.Query(query) + require.NoError(t, err, "query failed") + assert.Len( + t, result.ForwardingEvents, 50, + "wrong number of remaining events", + ) + + // The remaining events should be events[50:]. + assert.Equal( + t, events[50:], result.ForwardingEvents, + "wrong events remaining", + ) +} + +// TestForwardingLogBatchDeletion tests that deletion works correctly with +// different batch sizes. +func TestForwardingLogBatchDeletion(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + initialTime := time.Unix(3000, 0) + timestamp := initialTime + numEvents := 250 + events := make([]ForwardingEvent, numEvents) + + for i := 0; i < numEvents; i++ { + events[i] = ForwardingEvent{ + Timestamp: timestamp, + IncomingChanID: lnwire.NewShortChanIDFromInt(uint64(i)), + OutgoingChanID: lnwire.NewShortChanIDFromInt(uint64(i + 100)), + AmtIn: lnwire.MilliSatoshi(10000), + AmtOut: lnwire.MilliSatoshi(9000), + IncomingHtlcID: fn.Some(uint64(i)), + OutgoingHtlcID: fn.Some(uint64(i)), + } + timestamp = timestamp.Add(time.Minute) + } + + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + // Delete with a small batch size to test multiple batches. + deleteTime := timestamp.Add(time.Minute) + stats, err := log.DeleteForwardingEvents(deleteTime, 75) + require.NoError(t, err, "unable to delete events") + + // Should have deleted all events across multiple batches. + assert.Equal(t, uint64(numEvents), stats.NumEventsDeleted, + "wrong number of events deleted") + + // Fee per event is 1000 msat. + expectedFees := int64(numEvents * 1000) + assert.Equal(t, expectedFees, stats.TotalFeeMsat, "wrong total fees") + + // Verify all deleted. + query := ForwardingEventQuery{ + StartTime: initialTime, + EndTime: timestamp, + NumMaxEvents: 1000, + } + result, err := log.Query(query) + require.NoError(t, err, "query failed") + assert.Empty(t, result.ForwardingEvents, "events should be deleted") +} + +// TestForwardingLogDeleteEmpty tests deletion on an empty database. +func TestForwardingLogDeleteEmpty(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + // Try to delete from empty database. + deleteTime := time.Now() + stats, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "delete should not error on empty db") + + // Should have deleted 0 events with 0 fees. + assert.Equal( + t, uint64(0), stats.NumEventsDeleted, + "should delete 0 events", + ) + assert.Equal( + t, int64(0), stats.TotalFeeMsat, "should have 0 fees", + ) +} + +// TestForwardingLogDeleteTimeBoundary tests deletion at exact time boundaries. +func TestForwardingLogDeleteTimeBoundary(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + baseTime := time.Unix(5000, 0) + events := []ForwardingEvent{ + { + Timestamp: baseTime, + IncomingChanID: lnwire.NewShortChanIDFromInt(1), + OutgoingChanID: lnwire.NewShortChanIDFromInt(101), + AmtIn: 10000, + AmtOut: 9000, + IncomingHtlcID: fn.Some(uint64(0)), + OutgoingHtlcID: fn.Some(uint64(0)), + }, + { + Timestamp: baseTime.Add(time.Hour), + IncomingChanID: lnwire.NewShortChanIDFromInt(2), + OutgoingChanID: lnwire.NewShortChanIDFromInt(102), + AmtIn: 10000, + AmtOut: 9000, + IncomingHtlcID: fn.Some(uint64(1)), + OutgoingHtlcID: fn.Some(uint64(1)), + }, + { + Timestamp: baseTime.Add(2 * time.Hour), + IncomingChanID: lnwire.NewShortChanIDFromInt(3), + OutgoingChanID: lnwire.NewShortChanIDFromInt(103), + AmtIn: 10000, + AmtOut: 9000, + IncomingHtlcID: fn.Some(uint64(2)), + OutgoingHtlcID: fn.Some(uint64(2)), + }, + } + + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + // Delete events at exactly the second event's timestamp. This should + // delete events at baseTime and baseTime+1h. + deleteTime := baseTime.Add(time.Hour) + stats, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "unable to delete events") + + // Should delete exactly 2 events (those at or before deleteTime). + assert.Equal( + t, uint64(2), stats.NumEventsDeleted, + "wrong number of events deleted", + ) + + query := ForwardingEventQuery{ + StartTime: baseTime, + EndTime: baseTime.Add(3 * time.Hour), + NumMaxEvents: 10, + } + result, err := log.Query(query) + require.NoError(t, err, "query failed") + + // We should have 1 event remaining. + assert.Len( + t, result.ForwardingEvents, 1, "wrong number remaining", + ) + assert.Equal( + t, events[2], result.ForwardingEvents[0], + "wrong event remaining", + ) +} + +// TestForwardingLogDeleteMaxBatchSize tests that the max batch size is +// enforced. +func TestForwardingLogDeleteMaxBatchSize(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + // Create some events. + initialTime := time.Unix(6000, 0) + events := []ForwardingEvent{ + { + Timestamp: initialTime, + IncomingChanID: lnwire.NewShortChanIDFromInt(1), + OutgoingChanID: lnwire.NewShortChanIDFromInt(101), + AmtIn: 10000, + AmtOut: 9000, + IncomingHtlcID: fn.Some(uint64(0)), + OutgoingHtlcID: fn.Some(uint64(0)), + }, + } + + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + // Try to delete with a batch size larger than MaxResponseEvents. + deleteTime := initialTime.Add(time.Hour) + stats, err := log.DeleteForwardingEvents( + deleteTime, MaxResponseEvents+1000, + ) + require.NoError(t, err, "delete should succeed") + + // Should have deleted the event (batch size should be capped). + assert.Equal( + t, uint64(1), stats.NumEventsDeleted, "event should be deleted", + ) +} + +// TestForwardingLogDeleteIdempotent tests that deletion is idempotent. +func TestForwardingLogDeleteIdempotent(t *testing.T) { + t.Parallel() + + db, err := MakeTestDB(t) + require.NoError(t, err, "unable to make test db") + + log := ForwardingLog{ + db: db, + } + + // Create events. + initialTime := time.Unix(7000, 0) + timestamp := initialTime + events := make([]ForwardingEvent, 10) + for i := 0; i < 10; i++ { + events[i] = ForwardingEvent{ + Timestamp: timestamp, + IncomingChanID: lnwire.NewShortChanIDFromInt(uint64(i)), + OutgoingChanID: lnwire.NewShortChanIDFromInt(uint64(i + 100)), + AmtIn: lnwire.MilliSatoshi(10000), + AmtOut: lnwire.MilliSatoshi(9000), + IncomingHtlcID: fn.Some(uint64(i)), + OutgoingHtlcID: fn.Some(uint64(i)), + } + timestamp = timestamp.Add(time.Minute) + } + + err = log.AddForwardingEvents(events) + require.NoError(t, err, "unable to add events") + + deleteTime := timestamp + stats1, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "first delete failed") + assert.Equal(t, uint64(10), stats1.NumEventsDeleted) + + // Delete again with same time - should delete 0 events. + stats2, err := log.DeleteForwardingEvents(deleteTime, 0) + require.NoError(t, err, "second delete failed") + assert.Equal( + t, uint64(0), stats2.NumEventsDeleted, "should be idempotent", + ) + assert.Equal(t, int64(0), stats2.TotalFeeMsat, "should have no fees") +} + +// TestForwardingLogDeleteInvariants uses property-based testing to verify key +// invariants of the deletion logic. +func TestForwardingLogDeleteInvariants(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + db, err := MakeTestDB(t) + if err != nil { + rt.Fatalf("unable to make test db: %v", err) + } + + log := ForwardingLog{ + db: db, + } + + // Generate a random set of events. + baseTime := time.Unix( + rapid.Int64Range(10000, 100000).Draw(rt, "base_time"), + 0, + ) + numEvents := rapid.IntRange(1, 100).Draw(rt, "num_events") + + events := make([]ForwardingEvent, numEvents) + timestamp := baseTime + for i := 0; i < numEvents; i++ { + amtIn := rapid.Uint64Range( + 1000, 100000).Draw(rt, "amt_in") + amtOut := rapid.Uint64Range( + 500, uint64(amtIn)).Draw(rt, "amt_out") + + events[i] = ForwardingEvent{ + Timestamp: timestamp, + IncomingChanID: lnwire.NewShortChanIDFromInt( + rapid.Uint64().Draw(rt, "in_chan"), + ), + OutgoingChanID: lnwire.NewShortChanIDFromInt( + rapid.Uint64().Draw(rt, "out_chan"), + ), + AmtIn: lnwire.MilliSatoshi(amtIn), + AmtOut: lnwire.MilliSatoshi(amtOut), + IncomingHtlcID: fn.Some(uint64(i)), + OutgoingHtlcID: fn.Some(uint64(i)), + } + // Add random interval between events (1 second to 1 + // hour). + interval := rapid.Int64Range(1, 3600).Draw( + rt, "interval", + ) + timestamp = timestamp.Add( + time.Duration(interval) * time.Second, + ) + } + + // Add events to database. + err = log.AddForwardingEvents(events) + if err != nil { + rt.Fatalf("unable to add events: %v", err) + } + + // Pick a random delete time somewhere in the middle or after. + // This gives us a mix of partial and full deletions. + deleteIndex := rapid.IntRange(0, numEvents).Draw( + rt, "delete_index", + ) + + var deleteTime time.Time + if deleteIndex < numEvents { + deleteTime = events[deleteIndex].Timestamp + } else { + deleteTime = timestamp.Add(time.Hour) + } + + // Pick a random batch size, then delete with that batch size. + batchSize := rapid.IntRange(1, 100).Draw(rt, "batch_size") + stats, err := log.DeleteForwardingEvents(deleteTime, batchSize) + if err != nil { + rt.Fatalf("delete failed: %v", err) + } + + // Invariant 1: Number of deleted events should match count + // before delete time. + expectedDeleted := 0 + var expectedFees int64 + for _, event := range events { + if event.Timestamp.Before(deleteTime) || + event.Timestamp.Equal(deleteTime) { + + expectedDeleted++ + + expectedFees += int64(event.AmtIn - event.AmtOut) + } + } + if stats.NumEventsDeleted != uint64(expectedDeleted) { + rt.Fatalf("deleted count doesn't match: expected %d, got %d", + expectedDeleted, stats.NumEventsDeleted) + } + + // Invariant 2: Total fees should equal sum of deleted event + // fees. + if stats.TotalFeeMsat != expectedFees { + rt.Fatalf("total fees don't match: expected %d, got %d", + expectedFees, stats.TotalFeeMsat) + } + + // Invariant 3: Query should only return events after delete + // time. + query := ForwardingEventQuery{ + StartTime: baseTime, + EndTime: timestamp.Add(time.Hour), + NumMaxEvents: uint32(numEvents * 2), + } + result, err := log.Query(query) + if err != nil { + rt.Fatalf("query failed: %v", err) + } + + expectedRemaining := numEvents - expectedDeleted + if len(result.ForwardingEvents) != expectedRemaining { + rt.Fatalf("wrong number of remaining events: "+ + "expected %d, got %d", + expectedRemaining, len(result.ForwardingEvents)) + } + + // Invariant 4: All remaining events should be after delete + // time. + for _, event := range result.ForwardingEvents { + if !event.Timestamp.After(deleteTime) { + rt.Fatalf("remaining event is not "+ + "after delete time: %v <= %v", + event.Timestamp, deleteTime) + } + } + + // Invariant 5: Second deletion should be idempotent. + stats2, err := log.DeleteForwardingEvents(deleteTime, batchSize) + if err != nil { + rt.Fatalf("second delete failed: %v", err) + } + if stats2.NumEventsDeleted != 0 { + rt.Fatalf("second delete should delete nothing, got %d", + stats2.NumEventsDeleted) + } + if stats2.TotalFeeMsat != 0 { + rt.Fatalf("second delete should have no fees, got %d", + stats2.TotalFeeMsat) + } + }) +} From 3da9e6aed14063c478ced1aa87f5fd5b25209aa9 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:00 +0200 Subject: [PATCH 03/10] routerrpc: add DeleteForwardingHistory RPC definition In this commit, we define the new DeleteForwardingHistory RPC in the Router sub-server protocol, providing a clean API for privacy-focused deletion of old forwarding events. The RPC uses a oneof for time specification, allowing callers to provide either an absolute Unix timestamp (delete_before_time) or a relative duration string (duration like "-1w" or "-1M"). This flexibility accommodates both precise compliance deadlines and convenient regular cleanup schedules. The duration format supports seconds, minutes, hours, days, weeks, months, and years. The response includes the count of deleted events and total fees in millisatoshis, enabling operators to maintain financial records while discarding detailed routing surveillance data. The status field provides human-readable feedback about the operation. --- lnrpc/routerrpc/router.proto | 48 +++++++++++++++++++++++++++++++ lnrpc/routerrpc/router_backend.go | 18 ++++++++++++ 2 files changed, 66 insertions(+) diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto index 9e305e37e64..2522106b199 100644 --- a/lnrpc/routerrpc/router.proto +++ b/lnrpc/routerrpc/router.proto @@ -202,6 +202,18 @@ service Router { */ rpc XFindBaseLocalChanAlias (FindBaseAliasRequest) returns (FindBaseAliasResponse); + + /* lncli: `deletefwdhistory` + DeleteForwardingHistory allows the caller to delete forwarding history + events older than a specified time. This is useful for implementing data + retention policies for privacy purposes. The call deletes events in batches + and returns statistics including the total number of events deleted and the + aggregate fees earned from those events. The deletion is performed in a + transaction-safe manner with configurable batch sizes to avoid holding + large database locks. + */ + rpc DeleteForwardingHistory (DeleteForwardingHistoryRequest) + returns (DeleteForwardingHistoryResponse); } message SendPaymentRequest { @@ -1133,4 +1145,40 @@ message FindBaseAliasRequest { message FindBaseAliasResponse { // The base scid that resulted from the base scid look up. uint64 base = 1; +} + +message DeleteForwardingHistoryRequest { + // Specify the time before which to delete forwarding events using one of + // the following options: + oneof time_spec { + // Absolute Unix timestamp (seconds) - delete events before this time. + uint64 delete_before_time = 1; + + // Relative duration string supporting both standard Go format and + // custom units for convenience. + // Standard Go: "-24h" for 1 day, "-1.5h" for 1.5 hours + // Custom units: "-1d", "-1w", "-1M", "-1y" + // Supported: ns, us/µs, ms, s, m, h, d (days), w (weeks), + // M (months=30.44d), y (years=365.25d). + // Use negative values to specify time in the past. + string duration = 2; + } + + // Batch size for deletion (default 10000, max 50000). + // Controls how many events are deleted per database transaction to avoid + // holding large locks. + uint32 batch_size = 3; +} + +message DeleteForwardingHistoryResponse { + // Number of forwarding events deleted. + uint64 events_deleted = 1; + + // Total fees earned from deleted events (in millisatoshis). + // This is the sum of (amt_in - amt_out) for all deleted events, which + // can be used for accounting purposes. + int64 total_fee_msat = 2; + + // Status message. + string status = 3; } \ No newline at end of file diff --git a/lnrpc/routerrpc/router_backend.go b/lnrpc/routerrpc/router_backend.go index 377d0be3ea0..ebcee8bb3e3 100644 --- a/lnrpc/routerrpc/router_backend.go +++ b/lnrpc/routerrpc/router_backend.go @@ -14,6 +14,7 @@ import ( "github.com/btcsuite/btcd/chaincfg" "github.com/btcsuite/btcd/wire" sphinx "github.com/lightningnetwork/lightning-onion" + "github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/clock" "github.com/lightningnetwork/lnd/feature" "github.com/lightningnetwork/lnd/fn/v2" @@ -123,6 +124,23 @@ type RouterBackend struct { // Clock is the clock used to validate payment requests expiry. // It is useful for testing. Clock clock.Clock + + // ForwardingLog provides access to forwarding log database operations. + ForwardingLog ForwardingLogDB +} + +// ForwardingLogDB defines the interface for forwarding log database operations. +// This interface allows the router RPC to interact with the forwarding log +// without depending directly on the channeldb implementation, making testing +// and future refactoring easier. +type ForwardingLogDB interface { + // DeleteForwardingEvents deletes all forwarding events older than the + // specified endTime. The deletion is performed in batches of the given + // size to avoid holding large database locks. It returns statistics + // about the deletion including the number of events deleted and the + // total fees earned from those events. + DeleteForwardingEvents(endTime time.Time, batchSize int) ( + channeldb.DeleteStats, error) } // MissionControl defines the mission control dependencies of routerrpc. From 9ebe03de95ebe84e80406a6d3dca4a0e43f0eeed Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:07 +0200 Subject: [PATCH 04/10] routerrpc: regenerate RPC stubs for DeleteForwardingHistory In this commit, we regenerate the protocol buffer code using make rpc to produce the Go client/server interfaces, JSON bindings, and Swagger documentation for the new DeleteForwardingHistory RPC. --- lnrpc/routerrpc/router.pb.go | 693 ++++++++++++++++++---------- lnrpc/routerrpc/router.pb.json.go | 25 + lnrpc/routerrpc/router.swagger.json | 19 + lnrpc/routerrpc/router_grpc.pb.go | 52 +++ 4 files changed, 555 insertions(+), 234 deletions(-) diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go index a4497c2bb5d..18eb9eaf124 100644 --- a/lnrpc/routerrpc/router.pb.go +++ b/lnrpc/routerrpc/router.pb.go @@ -3726,6 +3726,174 @@ func (x *FindBaseAliasResponse) GetBase() uint64 { return 0 } +type DeleteForwardingHistoryRequest struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields + + // Specify the time before which to delete forwarding events using one of + // the following options: + // + // Types that are assignable to TimeSpec: + // + // *DeleteForwardingHistoryRequest_DeleteBeforeTime + // *DeleteForwardingHistoryRequest_Duration + TimeSpec isDeleteForwardingHistoryRequest_TimeSpec `protobuf_oneof:"time_spec"` + // Batch size for deletion (default 10000, max 50000). + // Controls how many events are deleted per database transaction to avoid + // holding large locks. + BatchSize uint32 `protobuf:"varint,3,opt,name=batch_size,json=batchSize,proto3" json:"batch_size,omitempty"` +} + +func (x *DeleteForwardingHistoryRequest) Reset() { + *x = DeleteForwardingHistoryRequest{} + if protoimpl.UnsafeEnabled { + mi := &file_routerrpc_router_proto_msgTypes[47] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *DeleteForwardingHistoryRequest) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*DeleteForwardingHistoryRequest) ProtoMessage() {} + +func (x *DeleteForwardingHistoryRequest) ProtoReflect() protoreflect.Message { + mi := &file_routerrpc_router_proto_msgTypes[47] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use DeleteForwardingHistoryRequest.ProtoReflect.Descriptor instead. +func (*DeleteForwardingHistoryRequest) Descriptor() ([]byte, []int) { + return file_routerrpc_router_proto_rawDescGZIP(), []int{47} +} + +func (m *DeleteForwardingHistoryRequest) GetTimeSpec() isDeleteForwardingHistoryRequest_TimeSpec { + if m != nil { + return m.TimeSpec + } + return nil +} + +func (x *DeleteForwardingHistoryRequest) GetDeleteBeforeTime() uint64 { + if x, ok := x.GetTimeSpec().(*DeleteForwardingHistoryRequest_DeleteBeforeTime); ok { + return x.DeleteBeforeTime + } + return 0 +} + +func (x *DeleteForwardingHistoryRequest) GetDuration() string { + if x, ok := x.GetTimeSpec().(*DeleteForwardingHistoryRequest_Duration); ok { + return x.Duration + } + return "" +} + +func (x *DeleteForwardingHistoryRequest) GetBatchSize() uint32 { + if x != nil { + return x.BatchSize + } + return 0 +} + +type isDeleteForwardingHistoryRequest_TimeSpec interface { + isDeleteForwardingHistoryRequest_TimeSpec() +} + +type DeleteForwardingHistoryRequest_DeleteBeforeTime struct { + // Absolute Unix timestamp (seconds) - delete events before this time. + DeleteBeforeTime uint64 `protobuf:"varint,1,opt,name=delete_before_time,json=deleteBeforeTime,proto3,oneof"` +} + +type DeleteForwardingHistoryRequest_Duration struct { + // Relative duration string (e.g., "-1w", "-1m", "-1y"). + // Supports: s(seconds), m(minutes), h(hours), d(days), w(weeks), + // M(months), y(years). Month equals 30.44 days, year equals 365.25 + // days. + Duration string `protobuf:"bytes,2,opt,name=duration,proto3,oneof"` +} + +func (*DeleteForwardingHistoryRequest_DeleteBeforeTime) isDeleteForwardingHistoryRequest_TimeSpec() {} + +func (*DeleteForwardingHistoryRequest_Duration) isDeleteForwardingHistoryRequest_TimeSpec() {} + +type DeleteForwardingHistoryResponse struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields + + // Number of forwarding events deleted. + EventsDeleted uint64 `protobuf:"varint,1,opt,name=events_deleted,json=eventsDeleted,proto3" json:"events_deleted,omitempty"` + // Total fees earned from deleted events (in millisatoshis). + // This is the sum of (amt_in - amt_out) for all deleted events, which + // can be used for accounting purposes. + TotalFeeMsat int64 `protobuf:"varint,2,opt,name=total_fee_msat,json=totalFeeMsat,proto3" json:"total_fee_msat,omitempty"` + // Status message. + Status string `protobuf:"bytes,3,opt,name=status,proto3" json:"status,omitempty"` +} + +func (x *DeleteForwardingHistoryResponse) Reset() { + *x = DeleteForwardingHistoryResponse{} + if protoimpl.UnsafeEnabled { + mi := &file_routerrpc_router_proto_msgTypes[48] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *DeleteForwardingHistoryResponse) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*DeleteForwardingHistoryResponse) ProtoMessage() {} + +func (x *DeleteForwardingHistoryResponse) ProtoReflect() protoreflect.Message { + mi := &file_routerrpc_router_proto_msgTypes[48] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use DeleteForwardingHistoryResponse.ProtoReflect.Descriptor instead. +func (*DeleteForwardingHistoryResponse) Descriptor() ([]byte, []int) { + return file_routerrpc_router_proto_rawDescGZIP(), []int{48} +} + +func (x *DeleteForwardingHistoryResponse) GetEventsDeleted() uint64 { + if x != nil { + return x.EventsDeleted + } + return 0 +} + +func (x *DeleteForwardingHistoryResponse) GetTotalFeeMsat() int64 { + if x != nil { + return x.TotalFeeMsat + } + return 0 +} + +func (x *DeleteForwardingHistoryResponse) GetStatus() string { + if x != nil { + return x.Status + } + return "" +} + var File_routerrpc_router_proto protoreflect.FileDescriptor var file_routerrpc_router_proto_rawDesc = []byte{ @@ -4238,180 +4406,205 @@ var file_routerrpc_router_proto_rawDesc = []byte{ 0x6c, 0x69, 0x61, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x05, 0x61, 0x6c, 0x69, 0x61, 0x73, 0x22, 0x2b, 0x0a, 0x15, 0x46, 0x69, 0x6e, 0x64, 0x42, 0x61, 0x73, 0x65, 0x41, 0x6c, 0x69, 0x61, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x62, 0x61, - 0x73, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x04, 0x62, 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0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x72, 0x70, + 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33, } var ( @@ -4427,7 +4620,7 @@ func file_routerrpc_router_proto_rawDescGZIP() []byte { } var file_routerrpc_router_proto_enumTypes = make([]protoimpl.EnumInfo, 6) -var file_routerrpc_router_proto_msgTypes = make([]protoimpl.MessageInfo, 54) +var file_routerrpc_router_proto_msgTypes = make([]protoimpl.MessageInfo, 56) var file_routerrpc_router_proto_goTypes = []interface{}{ (FailureDetail)(0), // 0: routerrpc.FailureDetail (PaymentState)(0), // 1: routerrpc.PaymentState @@ -4482,33 +4675,35 @@ var file_routerrpc_router_proto_goTypes = []interface{}{ (*DeleteAliasesResponse)(nil), // 50: routerrpc.DeleteAliasesResponse (*FindBaseAliasRequest)(nil), // 51: routerrpc.FindBaseAliasRequest (*FindBaseAliasResponse)(nil), // 52: routerrpc.FindBaseAliasResponse - nil, // 53: routerrpc.SendPaymentRequest.DestCustomRecordsEntry - nil, // 54: routerrpc.SendPaymentRequest.FirstHopCustomRecordsEntry - nil, // 55: routerrpc.SendToRouteRequest.FirstHopCustomRecordsEntry - nil, // 56: routerrpc.BuildRouteRequest.FirstHopCustomRecordsEntry - nil, // 57: routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry - nil, // 58: routerrpc.ForwardHtlcInterceptRequest.InWireCustomRecordsEntry - nil, // 59: routerrpc.ForwardHtlcInterceptResponse.OutWireCustomRecordsEntry - (*lnrpc.RouteHint)(nil), // 60: lnrpc.RouteHint - (lnrpc.FeatureBit)(0), // 61: lnrpc.FeatureBit - (lnrpc.PaymentFailureReason)(0), // 62: lnrpc.PaymentFailureReason - (*lnrpc.Route)(nil), // 63: lnrpc.Route - (*lnrpc.Failure)(nil), // 64: lnrpc.Failure - (lnrpc.Failure_FailureCode)(0), // 65: lnrpc.Failure.FailureCode - (*lnrpc.HTLCAttempt)(nil), // 66: lnrpc.HTLCAttempt - (*lnrpc.ChannelPoint)(nil), // 67: lnrpc.ChannelPoint - (*lnrpc.AliasMap)(nil), // 68: lnrpc.AliasMap - (*lnrpc.Payment)(nil), // 69: lnrpc.Payment + (*DeleteForwardingHistoryRequest)(nil), // 53: routerrpc.DeleteForwardingHistoryRequest + (*DeleteForwardingHistoryResponse)(nil), // 54: routerrpc.DeleteForwardingHistoryResponse + nil, // 55: routerrpc.SendPaymentRequest.DestCustomRecordsEntry + nil, // 56: routerrpc.SendPaymentRequest.FirstHopCustomRecordsEntry + nil, // 57: routerrpc.SendToRouteRequest.FirstHopCustomRecordsEntry + nil, // 58: routerrpc.BuildRouteRequest.FirstHopCustomRecordsEntry + nil, // 59: routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry + nil, // 60: routerrpc.ForwardHtlcInterceptRequest.InWireCustomRecordsEntry + nil, // 61: routerrpc.ForwardHtlcInterceptResponse.OutWireCustomRecordsEntry + (*lnrpc.RouteHint)(nil), // 62: lnrpc.RouteHint + (lnrpc.FeatureBit)(0), // 63: lnrpc.FeatureBit + (lnrpc.PaymentFailureReason)(0), // 64: lnrpc.PaymentFailureReason + (*lnrpc.Route)(nil), // 65: lnrpc.Route + (*lnrpc.Failure)(nil), // 66: lnrpc.Failure + (lnrpc.Failure_FailureCode)(0), // 67: lnrpc.Failure.FailureCode + (*lnrpc.HTLCAttempt)(nil), // 68: lnrpc.HTLCAttempt + (*lnrpc.ChannelPoint)(nil), // 69: lnrpc.ChannelPoint + (*lnrpc.AliasMap)(nil), // 70: lnrpc.AliasMap + (*lnrpc.Payment)(nil), // 71: lnrpc.Payment } var file_routerrpc_router_proto_depIdxs = []int32{ - 60, // 0: routerrpc.SendPaymentRequest.route_hints:type_name -> lnrpc.RouteHint - 53, // 1: routerrpc.SendPaymentRequest.dest_custom_records:type_name -> routerrpc.SendPaymentRequest.DestCustomRecordsEntry - 61, // 2: routerrpc.SendPaymentRequest.dest_features:type_name -> lnrpc.FeatureBit - 54, // 3: routerrpc.SendPaymentRequest.first_hop_custom_records:type_name -> routerrpc.SendPaymentRequest.FirstHopCustomRecordsEntry - 62, // 4: routerrpc.RouteFeeResponse.failure_reason:type_name -> lnrpc.PaymentFailureReason - 63, // 5: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route - 55, // 6: routerrpc.SendToRouteRequest.first_hop_custom_records:type_name -> routerrpc.SendToRouteRequest.FirstHopCustomRecordsEntry - 64, // 7: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure + 62, // 0: routerrpc.SendPaymentRequest.route_hints:type_name -> lnrpc.RouteHint + 55, // 1: routerrpc.SendPaymentRequest.dest_custom_records:type_name -> routerrpc.SendPaymentRequest.DestCustomRecordsEntry + 63, // 2: routerrpc.SendPaymentRequest.dest_features:type_name -> lnrpc.FeatureBit + 56, // 3: routerrpc.SendPaymentRequest.first_hop_custom_records:type_name -> routerrpc.SendPaymentRequest.FirstHopCustomRecordsEntry + 64, // 4: routerrpc.RouteFeeResponse.failure_reason:type_name -> lnrpc.PaymentFailureReason + 65, // 5: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route + 57, // 6: routerrpc.SendToRouteRequest.first_hop_custom_records:type_name -> routerrpc.SendToRouteRequest.FirstHopCustomRecordsEntry + 66, // 7: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure 19, // 8: routerrpc.QueryMissionControlResponse.pairs:type_name -> routerrpc.PairHistory 19, // 9: routerrpc.XImportMissionControlRequest.pairs:type_name -> routerrpc.PairHistory 20, // 10: routerrpc.PairHistory.history:type_name -> routerrpc.PairData @@ -4518,8 +4713,8 @@ var file_routerrpc_router_proto_depIdxs = []int32{ 27, // 14: routerrpc.MissionControlConfig.apriori:type_name -> routerrpc.AprioriParameters 26, // 15: routerrpc.MissionControlConfig.bimodal:type_name -> routerrpc.BimodalParameters 20, // 16: routerrpc.QueryProbabilityResponse.history:type_name -> routerrpc.PairData - 56, // 17: routerrpc.BuildRouteRequest.first_hop_custom_records:type_name -> routerrpc.BuildRouteRequest.FirstHopCustomRecordsEntry - 63, // 18: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route + 58, // 17: routerrpc.BuildRouteRequest.first_hop_custom_records:type_name -> routerrpc.BuildRouteRequest.FirstHopCustomRecordsEntry + 65, // 18: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route 5, // 19: routerrpc.HtlcEvent.event_type:type_name -> routerrpc.HtlcEvent.EventType 35, // 20: routerrpc.HtlcEvent.forward_event:type_name -> routerrpc.ForwardEvent 36, // 21: routerrpc.HtlcEvent.forward_fail_event:type_name -> routerrpc.ForwardFailEvent @@ -4529,23 +4724,23 @@ var file_routerrpc_router_proto_depIdxs = []int32{ 38, // 25: routerrpc.HtlcEvent.final_htlc_event:type_name -> routerrpc.FinalHtlcEvent 34, // 26: routerrpc.ForwardEvent.info:type_name -> routerrpc.HtlcInfo 34, // 27: routerrpc.LinkFailEvent.info:type_name -> routerrpc.HtlcInfo - 65, // 28: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode + 67, // 28: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode 0, // 29: routerrpc.LinkFailEvent.failure_detail:type_name -> routerrpc.FailureDetail 1, // 30: routerrpc.PaymentStatus.state:type_name -> routerrpc.PaymentState - 66, // 31: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt + 68, // 31: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt 42, // 32: routerrpc.ForwardHtlcInterceptRequest.incoming_circuit_key:type_name -> routerrpc.CircuitKey - 57, // 33: routerrpc.ForwardHtlcInterceptRequest.custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry - 58, // 34: routerrpc.ForwardHtlcInterceptRequest.in_wire_custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.InWireCustomRecordsEntry + 59, // 33: routerrpc.ForwardHtlcInterceptRequest.custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry + 60, // 34: routerrpc.ForwardHtlcInterceptRequest.in_wire_custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.InWireCustomRecordsEntry 42, // 35: routerrpc.ForwardHtlcInterceptResponse.incoming_circuit_key:type_name -> routerrpc.CircuitKey 2, // 36: routerrpc.ForwardHtlcInterceptResponse.action:type_name -> routerrpc.ResolveHoldForwardAction - 65, // 37: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode - 59, // 38: routerrpc.ForwardHtlcInterceptResponse.out_wire_custom_records:type_name -> routerrpc.ForwardHtlcInterceptResponse.OutWireCustomRecordsEntry - 67, // 39: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint + 67, // 37: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode + 61, // 38: routerrpc.ForwardHtlcInterceptResponse.out_wire_custom_records:type_name -> routerrpc.ForwardHtlcInterceptResponse.OutWireCustomRecordsEntry + 69, // 39: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint 3, // 40: routerrpc.UpdateChanStatusRequest.action:type_name -> routerrpc.ChanStatusAction - 68, // 41: routerrpc.AddAliasesRequest.alias_maps:type_name -> lnrpc.AliasMap - 68, // 42: routerrpc.AddAliasesResponse.alias_maps:type_name -> lnrpc.AliasMap - 68, // 43: routerrpc.DeleteAliasesRequest.alias_maps:type_name -> lnrpc.AliasMap - 68, // 44: routerrpc.DeleteAliasesResponse.alias_maps:type_name -> lnrpc.AliasMap + 70, // 41: routerrpc.AddAliasesRequest.alias_maps:type_name -> lnrpc.AliasMap + 70, // 42: routerrpc.AddAliasesResponse.alias_maps:type_name -> lnrpc.AliasMap + 70, // 43: routerrpc.DeleteAliasesRequest.alias_maps:type_name -> lnrpc.AliasMap + 70, // 44: routerrpc.DeleteAliasesResponse.alias_maps:type_name -> lnrpc.AliasMap 6, // 45: routerrpc.Router.SendPaymentV2:input_type -> routerrpc.SendPaymentRequest 7, // 46: routerrpc.Router.TrackPaymentV2:input_type -> routerrpc.TrackPaymentRequest 8, // 47: routerrpc.Router.TrackPayments:input_type -> routerrpc.TrackPaymentsRequest @@ -4567,29 +4762,31 @@ var file_routerrpc_router_proto_depIdxs = []int32{ 47, // 63: routerrpc.Router.XAddLocalChanAliases:input_type -> routerrpc.AddAliasesRequest 49, // 64: routerrpc.Router.XDeleteLocalChanAliases:input_type -> routerrpc.DeleteAliasesRequest 51, // 65: routerrpc.Router.XFindBaseLocalChanAlias:input_type -> routerrpc.FindBaseAliasRequest - 69, // 66: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment - 69, // 67: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment - 69, // 68: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment - 10, // 69: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse - 12, // 70: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse - 66, // 71: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt - 14, // 72: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse - 16, // 73: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse - 18, // 74: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse - 22, // 75: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse - 24, // 76: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse - 29, // 77: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse - 31, // 78: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse - 33, // 79: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent - 41, // 80: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus - 41, // 81: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus - 43, // 82: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest - 46, // 83: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse - 48, // 84: routerrpc.Router.XAddLocalChanAliases:output_type -> routerrpc.AddAliasesResponse - 50, // 85: routerrpc.Router.XDeleteLocalChanAliases:output_type -> routerrpc.DeleteAliasesResponse - 52, // 86: routerrpc.Router.XFindBaseLocalChanAlias:output_type -> routerrpc.FindBaseAliasResponse - 66, // [66:87] is the sub-list for method output_type - 45, // [45:66] is the sub-list for method input_type + 53, // 66: routerrpc.Router.DeleteForwardingHistory:input_type -> routerrpc.DeleteForwardingHistoryRequest + 71, // 67: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment + 71, // 68: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment + 71, // 69: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment + 10, // 70: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse + 12, // 71: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse + 68, // 72: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt + 14, // 73: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse + 16, // 74: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse + 18, // 75: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse + 22, // 76: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse + 24, // 77: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse + 29, // 78: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse + 31, // 79: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse + 33, // 80: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent + 41, // 81: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus + 41, // 82: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus + 43, // 83: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest + 46, // 84: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse + 48, // 85: routerrpc.Router.XAddLocalChanAliases:output_type -> routerrpc.AddAliasesResponse + 50, // 86: routerrpc.Router.XDeleteLocalChanAliases:output_type -> routerrpc.DeleteAliasesResponse + 52, // 87: routerrpc.Router.XFindBaseLocalChanAlias:output_type -> routerrpc.FindBaseAliasResponse + 54, // 88: routerrpc.Router.DeleteForwardingHistory:output_type -> routerrpc.DeleteForwardingHistoryResponse + 67, // [67:89] is the sub-list for method output_type + 45, // [45:67] is the sub-list for method input_type 45, // [45:45] is the sub-list for extension type_name 45, // [45:45] is the sub-list for extension extendee 0, // [0:45] is the sub-list for field type_name @@ -5165,6 +5362,30 @@ func file_routerrpc_router_proto_init() { return nil } } + file_routerrpc_router_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*DeleteForwardingHistoryRequest); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } + file_routerrpc_router_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*DeleteForwardingHistoryResponse); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } } file_routerrpc_router_proto_msgTypes[19].OneofWrappers = []interface{}{ (*MissionControlConfig_Apriori)(nil), @@ -5178,13 +5399,17 @@ func file_routerrpc_router_proto_init() { (*HtlcEvent_SubscribedEvent)(nil), (*HtlcEvent_FinalHtlcEvent)(nil), } + file_routerrpc_router_proto_msgTypes[47].OneofWrappers = []interface{}{ + (*DeleteForwardingHistoryRequest_DeleteBeforeTime)(nil), + (*DeleteForwardingHistoryRequest_Duration)(nil), + } type x struct{} out := protoimpl.TypeBuilder{ File: protoimpl.DescBuilder{ GoPackagePath: reflect.TypeOf(x{}).PkgPath(), RawDescriptor: file_routerrpc_router_proto_rawDesc, NumEnums: 6, - NumMessages: 54, + NumMessages: 56, NumExtensions: 0, NumServices: 1, }, diff --git a/lnrpc/routerrpc/router.pb.json.go b/lnrpc/routerrpc/router.pb.json.go index 18fbc07fa85..b5212b37344 100644 --- a/lnrpc/routerrpc/router.pb.json.go +++ b/lnrpc/routerrpc/router.pb.json.go @@ -622,4 +622,29 @@ func RegisterRouterJSONCallbacks(registry map[string]func(ctx context.Context, } callback(string(respBytes), nil) } + + registry["routerrpc.Router.DeleteForwardingHistory"] = func(ctx context.Context, + conn *grpc.ClientConn, reqJSON string, callback func(string, error)) { + + req := &DeleteForwardingHistoryRequest{} + err := marshaler.Unmarshal([]byte(reqJSON), req) + if err != nil { + callback("", err) + return + } + + client := NewRouterClient(conn) + resp, err := client.DeleteForwardingHistory(ctx, req) + if err != nil { + callback("", err) + return + } + + respBytes, err := marshaler.Marshal(resp) + if err != nil { + callback("", err) + return + } + callback(string(respBytes), nil) + } } diff --git a/lnrpc/routerrpc/router.swagger.json b/lnrpc/routerrpc/router.swagger.json index 996ead61639..2d95c8f850c 100644 --- a/lnrpc/routerrpc/router.swagger.json +++ b/lnrpc/routerrpc/router.swagger.json @@ -1404,6 +1404,25 @@ } } }, + "routerrpcDeleteForwardingHistoryResponse": { + "type": "object", + "properties": { + "events_deleted": { + "type": "string", + "format": "uint64", + "description": "Number of forwarding events deleted." + }, + "total_fee_msat": { + "type": "string", + "format": "int64", + "description": "Total fees earned from deleted events (in millisatoshis).\nThis is the sum of (amt_in - amt_out) for all deleted events, which\ncan be used for accounting purposes." + }, + "status": { + "type": "string", + "description": "Status message." + } + } + }, "routerrpcFailureDetail": { "type": "string", "enum": [ diff --git a/lnrpc/routerrpc/router_grpc.pb.go b/lnrpc/routerrpc/router_grpc.pb.go index 6e7e980fc84..d6c60043d8c 100644 --- a/lnrpc/routerrpc/router_grpc.pb.go +++ b/lnrpc/routerrpc/router_grpc.pb.go @@ -131,6 +131,15 @@ type RouterClient interface { // XFindBaseLocalChanAlias is an experimental API that looks up the base scid // for a local chan alias that was registered during the current runtime. XFindBaseLocalChanAlias(ctx context.Context, in *FindBaseAliasRequest, opts ...grpc.CallOption) (*FindBaseAliasResponse, error) + // lncli: `deletefwdhistory` + // DeleteForwardingHistory allows the caller to delete forwarding history + // events older than a specified time. This is useful for implementing data + // retention policies for privacy purposes. The call deletes events in batches + // and returns statistics including the total number of events deleted and the + // aggregate fees earned from those events. The deletion is performed in a + // transaction-safe manner with configurable batch sizes to avoid holding + // large database locks. + DeleteForwardingHistory(ctx context.Context, in *DeleteForwardingHistoryRequest, opts ...grpc.CallOption) (*DeleteForwardingHistoryResponse, error) } type routerClient struct { @@ -493,6 +502,15 @@ func (c *routerClient) XFindBaseLocalChanAlias(ctx context.Context, in *FindBase return out, nil } +func (c *routerClient) DeleteForwardingHistory(ctx context.Context, in *DeleteForwardingHistoryRequest, opts ...grpc.CallOption) (*DeleteForwardingHistoryResponse, error) { + out := new(DeleteForwardingHistoryResponse) + err := c.cc.Invoke(ctx, "/routerrpc.Router/DeleteForwardingHistory", in, out, opts...) + if err != nil { + return nil, err + } + return out, nil +} + // RouterServer is the server API for Router service. // All implementations must embed UnimplementedRouterServer // for forward compatibility @@ -609,6 +627,15 @@ type RouterServer interface { // XFindBaseLocalChanAlias is an experimental API that looks up the base scid // for a local chan alias that was registered during the current runtime. XFindBaseLocalChanAlias(context.Context, *FindBaseAliasRequest) (*FindBaseAliasResponse, error) + // lncli: `deletefwdhistory` + // DeleteForwardingHistory allows the caller to delete forwarding history + // events older than a specified time. This is useful for implementing data + // retention policies for privacy purposes. The call deletes events in batches + // and returns statistics including the total number of events deleted and the + // aggregate fees earned from those events. The deletion is performed in a + // transaction-safe manner with configurable batch sizes to avoid holding + // large database locks. + DeleteForwardingHistory(context.Context, *DeleteForwardingHistoryRequest) (*DeleteForwardingHistoryResponse, error) mustEmbedUnimplementedRouterServer() } @@ -679,6 +706,9 @@ func (UnimplementedRouterServer) XDeleteLocalChanAliases(context.Context, *Delet func (UnimplementedRouterServer) XFindBaseLocalChanAlias(context.Context, *FindBaseAliasRequest) (*FindBaseAliasResponse, error) { return nil, status.Errorf(codes.Unimplemented, "method XFindBaseLocalChanAlias not implemented") } +func (UnimplementedRouterServer) DeleteForwardingHistory(context.Context, *DeleteForwardingHistoryRequest) (*DeleteForwardingHistoryResponse, error) { + return nil, status.Errorf(codes.Unimplemented, "method DeleteForwardingHistory not implemented") +} func (UnimplementedRouterServer) mustEmbedUnimplementedRouterServer() {} // UnsafeRouterServer may be embedded to opt out of forward compatibility for this service. @@ -1096,6 +1126,24 @@ func _Router_XFindBaseLocalChanAlias_Handler(srv interface{}, ctx context.Contex return interceptor(ctx, in, info, handler) } +func _Router_DeleteForwardingHistory_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { + in := new(DeleteForwardingHistoryRequest) + if err := dec(in); err != nil { + return nil, err + } + if interceptor == nil { + return srv.(RouterServer).DeleteForwardingHistory(ctx, in) + } + info := &grpc.UnaryServerInfo{ + Server: srv, + FullMethod: "/routerrpc.Router/DeleteForwardingHistory", + } + handler := func(ctx context.Context, req interface{}) (interface{}, error) { + return srv.(RouterServer).DeleteForwardingHistory(ctx, req.(*DeleteForwardingHistoryRequest)) + } + return interceptor(ctx, in, info, handler) +} + // Router_ServiceDesc is the grpc.ServiceDesc for Router service. // It's only intended for direct use with grpc.RegisterService, // and not to be introspected or modified (even as a copy) @@ -1159,6 +1207,10 @@ var Router_ServiceDesc = grpc.ServiceDesc{ MethodName: "XFindBaseLocalChanAlias", Handler: _Router_XFindBaseLocalChanAlias_Handler, }, + { + MethodName: "DeleteForwardingHistory", + Handler: _Router_DeleteForwardingHistory_Handler, + }, }, Streams: []grpc.StreamDesc{ { From e6ed5067ae5feb1f6b7249a6662a3773bcc0c2b2 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:21 +0200 Subject: [PATCH 05/10] routerrpc: implement DeleteForwardingHistory RPC handler In this commit, we implement the server-side handler for the DeleteForwardingHistory RPC, connecting the protocol definition to the database layer through our ForwardingLogDB interface. The handler supports two time specification formats via the oneof field. For absolute timestamps, we convert directly from Unix seconds to a time.Time. For relative duration strings, we implement a parseDuration helper that supports natural time units (s, m, h, d, w, M for months, y for years) with negative values indicating "time ago" semantics. This makes invocations like "-1M" (one month ago) work intuitively at the CLI. Security is a key consideration in this implementation. We validate that the delete_before_time is at least 1 second in the past to prevent accidental deletion of very recent data. The current 1-second threshold is intentionally minimal for integration testing; in production deployments, operators would typically configure a longer minimum age (like 1 hour or 1 day) to provide additional safety margins. We also enforce batch size limits and provide comprehensive logging for audit trails. The response includes aggregated fee totals to support operators who need to maintain financial records separate from detailed routing surveillance data. This aligns with privacy-preserving accounting practices where aggregate revenue can be tracked without retaining granular event history. --- lnrpc/routerrpc/parse_duration_test.go | 243 +++++++++++++++++++++++++ lnrpc/routerrpc/router_server.go | 176 ++++++++++++++++++ 2 files changed, 419 insertions(+) create mode 100644 lnrpc/routerrpc/parse_duration_test.go diff --git a/lnrpc/routerrpc/parse_duration_test.go b/lnrpc/routerrpc/parse_duration_test.go new file mode 100644 index 00000000000..637b0183cb7 --- /dev/null +++ b/lnrpc/routerrpc/parse_duration_test.go @@ -0,0 +1,243 @@ +package routerrpc + +import ( + "fmt" + "testing" + "time" + + "github.com/stretchr/testify/require" + "pgregory.net/rapid" +) + +// TestParseDuration tests the hybrid duration parsing with explicit examples. +func TestParseDuration(t *testing.T) { + t.Parallel() + + tests := []struct { + name string + input string + expected time.Duration + wantErr bool + }{ + // Standard Go durations. + { + name: "standard go hours", + input: "-24h", + expected: -24 * time.Hour, + }, + { + name: "standard go fractional hours", + input: "-1.5h", + expected: time.Duration(-1.5 * float64(time.Hour)), + }, + { + name: "standard go minutes", + input: "-30m", + expected: -30 * time.Minute, + }, + { + name: "standard go seconds", + input: "-60s", + expected: -60 * time.Second, + }, + { + name: "standard go milliseconds", + input: "-500ms", + expected: -500 * time.Millisecond, + }, + { + name: "standard go microseconds", + input: "-1000us", + expected: -1000 * time.Microsecond, + }, + { + name: "standard go complex", + input: "-2h30m45s", + expected: -(2*time.Hour + 30*time.Minute + 45*time.Second), + }, + + // Custom units. + { + name: "custom days", + input: "-1d", + expected: -24 * time.Hour, + }, + { + name: "custom multiple days", + input: "-7d", + expected: -7 * 24 * time.Hour, + }, + { + name: "custom weeks", + input: "-1w", + expected: -7 * 24 * time.Hour, + }, + { + name: "custom multiple weeks", + input: "-4w", + expected: -4 * 7 * 24 * time.Hour, + }, + { + name: "custom months", + input: "-1M", + expected: time.Duration(-30.44 * 24 * float64(time.Hour)), + }, + { + name: "custom years", + input: "-1y", + expected: time.Duration(-365.25 * 24 * float64(time.Hour)), + }, + + // Error cases. + { + name: "positive duration", + input: "1h", + wantErr: true, + }, + { + name: "no minus sign custom", + input: "1d", + wantErr: true, + }, + { + name: "empty string", + input: "", + wantErr: true, + }, + { + name: "just minus", + input: "-", + wantErr: true, + }, + { + name: "no number", + input: "-d", + wantErr: true, + }, + { + name: "no unit", + input: "-5", + wantErr: true, + }, + { + name: "invalid unit", + input: "-1x", + wantErr: true, + }, + } + + for _, tt := range tests { + tt := tt + t.Run(tt.name, func(t *testing.T) { + t.Parallel() + + got, err := parseDuration(tt.input) + if tt.wantErr { + require.Error(t, err) + return + } + + require.NoError(t, err) + require.Equal(t, tt.expected, got) + }) + } +} + +// TestParseDurationProperties uses property-based testing to verify invariants. +func TestParseDurationProperties(t *testing.T) { + t.Parallel() + + // Test that all valid standard Go durations work. + t.Run("standard go durations", func(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + // Generate a random duration string using + // time.Duration's String() method. + hours := rapid.IntRange(-8760, -1).Draw(rt, "hours") + minutes := rapid.IntRange(0, 59).Draw(rt, "minutes") + seconds := rapid.IntRange(0, 59).Draw(rt, "seconds") + + d := time.Duration(hours)*time.Hour + + time.Duration(minutes)*time.Minute + + time.Duration(seconds)*time.Second + + // Parse it back. + parsed, err := parseDuration(d.String()) + require.NoError(rt, err) + + // Should match original (within a small margin for + // float precision). + diff := parsed - d + if diff < 0 { + diff = -diff + } + require.Less( + rt, diff, time.Microsecond, + "parsed duration differs: got %v, want %v", + parsed, d, + ) + }) + }) + + // Test that custom units produce negative durations. + t.Run("custom units negative", func(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + value := rapid.IntRange(1, 1000).Draw(rt, "value") + unit := rapid.SampledFrom([]string{"d", "w", "M", "y"}). + Draw(rt, "unit") + + input := fmt.Sprintf("-%d%s", value, unit) + + parsed, err := parseDuration(input) + require.NoError(rt, err) + require.Less( + rt, parsed, time.Duration(0), + "custom unit should produce negative duration", + ) + }) + }) + + // Test that days are always 24 hours. + t.Run("days invariant", func(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + days := rapid.IntRange(1, 365).Draw(rt, "days") + input := fmt.Sprintf("-%dd", days) + + parsed, err := parseDuration(input) + require.NoError(rt, err) + + expected := time.Duration(-days) * 24 * time.Hour + require.Equal(rt, expected, parsed) + }) + }) + + // Test that weeks are always 7 days. + t.Run("weeks invariant", func(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + weeks := rapid.IntRange(1, 52).Draw(rt, "weeks") + input := fmt.Sprintf("-%dw", weeks) + + parsed, err := parseDuration(input) + require.NoError(rt, err) + + expected := time.Duration(-weeks) * 7 * 24 * time.Hour + require.Equal(rt, expected, parsed) + }) + }) + + // Test that positive durations always error. + t.Run("positive durations error", func(t *testing.T) { + rapid.Check(t, func(rt *rapid.T) { + value := rapid.IntRange(1, 1000).Draw(rt, "value") + unit := rapid.SampledFrom([]string{ + "s", "m", "h", "d", "w", "M", "y", + }).Draw(rt, "unit") + + // Positive duration (no minus sign). + input := fmt.Sprintf("%d%s", value, unit) + + _, err := parseDuration(input) + require.Error(rt, err, + "positive duration should error: %s", input) + }) + }) +} diff --git a/lnrpc/routerrpc/router_server.go b/lnrpc/routerrpc/router_server.go index 1dbc19e47f9..973992c11a2 100644 --- a/lnrpc/routerrpc/router_server.go +++ b/lnrpc/routerrpc/router_server.go @@ -163,6 +163,10 @@ var ( Entity: "offchain", Action: "write", }}, + "/routerrpc.Router/DeleteForwardingHistory": {{ + Entity: "offchain", + Action: "write", + }}, } // DefaultRouterMacFilename is the default name of the router macaroon @@ -1820,3 +1824,175 @@ func (s *Server) UpdateChanStatus(_ context.Context, } return &UpdateChanStatusResponse{}, nil } + +// DeleteForwardingHistory deletes forwarding history events older than a +// specified time. This method is useful for implementing data retention +// policies for privacy purposes. +func (s *Server) DeleteForwardingHistory(ctx context.Context, + req *DeleteForwardingHistoryRequest) (*DeleteForwardingHistoryResponse, + error) { + + // First, determine the delete-before time based on the request. + var deleteBeforeTime time.Time + switch timeSpec := req.TimeSpec.(type) { + case *DeleteForwardingHistoryRequest_DeleteBeforeTime: + deleteBeforeTime = time.Unix( + int64(timeSpec.DeleteBeforeTime), 0, + ) + + case *DeleteForwardingHistoryRequest_Duration: + // Parse duration using hybrid approach: try standard library + // first, fall back to custom units (d, w, M, y) if needed. + duration, err := parseDuration(timeSpec.Duration) + if err != nil { + return nil, fmt.Errorf("invalid duration format: %w", err) + } + + // Calculate the absolute time by adding the duration (which + // should be negative) to now. + deleteBeforeTime = time.Now().Add(duration) + + default: + return nil, fmt.Errorf("time specification required: either " + + "delete_before_time or duration must be provided") + } + + // Security validation: prevent accidental deletion of very recent data. + // Require that the delete time is at least 1 second in the past. This + // provides a minimal safety check while allowing integration tests to + // work. In production, users typically delete much older data (days/ + // weeks/months old). + // + // TODO(roasbeef): Consider making this configurable or using a longer + // duration (e.g., 1 hour) for production with a way to override for + // testing. + minimumAge := 1 * time.Second + if time.Since(deleteBeforeTime) < minimumAge { + return nil, fmt.Errorf("delete_before_time must be at "+ + "least %v "+ + "in the past to prevent accidental deletion of recent "+ + "data (requested time: %v, current time: %v)", + minimumAge, deleteBeforeTime, time.Now()) + } + + // Set default batch size if not specified. + batchSize := int(req.BatchSize) + if batchSize == 0 { + batchSize = 10000 + } + + log.Infof("DeleteForwardingHistory: deleting events before %v with "+ + "batch size %d", deleteBeforeTime, batchSize) + + // Call the database deletion method. + stats, err := s.cfg.RouterBackend.ForwardingLog.DeleteForwardingEvents( + deleteBeforeTime, batchSize, + ) + if err != nil { + return nil, fmt.Errorf("failed to delete forwarding events: %w", + err) + } + + log.Infof("DeleteForwardingHistory: deleted %d events, total fees: "+ + "%d msat", stats.NumEventsDeleted, stats.TotalFeeMsat) + + return &DeleteForwardingHistoryResponse{ + EventsDeleted: stats.NumEventsDeleted, + TotalFeeMsat: stats.TotalFeeMsat, + Status: fmt.Sprintf("Successfully deleted %d forwarding events", + stats.NumEventsDeleted), + }, nil +} + +// parseDuration parses a duration string using a hybrid approach. It first +// attempts to use the standard library time.ParseDuration, which supports +// ns, us, ms, s, m, h. If that fails, it falls back to custom parsing for +// user-friendly units: d (days), w (weeks), M (months), y (years). +// +// Examples: +// - Standard Go: "-24h", "-1.5h", "-30m" +// - Custom units: "-1d", "-1w", "-1M", "-1y" +// +// All durations should be negative to indicate "time ago". +func parseDuration(durationStr string) (time.Duration, error) { + // First, try the standard library parser. + duration, err := time.ParseDuration(durationStr) + if err == nil { + // Enforce negative durations to prevent confusion. + if duration >= 0 { + return 0, fmt.Errorf("duration must be negative to " + + "indicate time in the past (e.g., -1w, -24h)") + } + return duration, nil + } + + // Fall back to custom parsing for d, w, M, y units. + if len(durationStr) < 2 { + return 0, fmt.Errorf("duration too short") + } + + // Duration strings should start with a minus sign for "ago". + if durationStr[0] != '-' { + return 0, fmt.Errorf("duration must be " + + "negative (e.g., -1w, -24h)") + } + + // Strip the minus sign. + durationStr = durationStr[1:] + + // Find where the numeric part ends. + var ( + numStr string + unit string + ) + for i, ch := range durationStr { + if ch < '0' || ch > '9' { + numStr = durationStr[:i] + unit = durationStr[i:] + break + } + } + + if numStr == "" { + return 0, fmt.Errorf("no numeric value found") + } + if unit == "" { + return 0, fmt.Errorf("no unit specified") + } + + var value int + _, parseErr := fmt.Sscanf(numStr, "%d", &value) + if parseErr != nil { + return 0, fmt.Errorf("invalid numeric value: %w", parseErr) + } + + // Calculate the duration based on the custom unit. + var customDuration time.Duration + switch unit { + case "d": + customDuration = time.Duration(value) * 24 * time.Hour + + case "w": + customDuration = time.Duration(value) * 7 * 24 * time.Hour + + case "M": + // Average month = 30.44 days. + customDuration = time.Duration( + float64(value) * 30.44 * 24 * float64(time.Hour), + ) + + case "y": + // Average year = 365.25 days. + customDuration = time.Duration( + float64(value) * 365.25 * 24 * float64(time.Hour), + ) + + default: + // Not a custom unit we recognize, return the original error. + return 0, fmt.Errorf("unknown time unit: %s (supported: ns, "+ + "us, ms, s, m, h, d, w, M, y)", unit) + } + + // Return negative duration (going back in time). + return -customDuration, nil +} From 012d94c91f9d6efbeaeacf4ecd43a02eeafe993b Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:29 +0200 Subject: [PATCH 06/10] lntest: add DeleteForwardingHistory to test harness In this commit, we extend the test harness RPC wrapper to include the new DeleteForwardingHistory method, following the established pattern for router RPC calls. This enables integration tests to invoke the deletion functionality with automatic error handling and logging. --- lntest/rpc/router.go | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/lntest/rpc/router.go b/lntest/rpc/router.go index ccc7b0ef62a..d368e660483 100644 --- a/lntest/rpc/router.go +++ b/lntest/rpc/router.go @@ -283,3 +283,19 @@ func (h *HarnessRPC) TrackPaymentV2(payHash []byte) TrackPaymentClient { return client } + +// DeleteForwardingHistory makes a RPC call to the node's RouterClient and +// asserts. +// +//nolint:ll +func (h *HarnessRPC) DeleteForwardingHistory( + req *routerrpc.DeleteForwardingHistoryRequest) *routerrpc.DeleteForwardingHistoryResponse { + + ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout) + defer cancel() + + resp, err := h.Router.DeleteForwardingHistory(ctxt, req) + h.NoError(err, "DeleteForwardingHistory") + + return resp +} From da2ad05d5966ebf7299b4709227a8b93ddd0d60d Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:36 +0200 Subject: [PATCH 07/10] rpcserver: wire ForwardingLog to router backend In this commit, we connect the forwarding log database interface to the router RPC backend, completing the dependency injection chain from the RPC handler down to the database layer. This single-line change enables the DeleteForwardingHistory RPC to access the actual forwarding event database through the clean ForwardingLogDB interface abstraction. --- rpcserver.go | 1 + 1 file changed, 1 insertion(+) diff --git a/rpcserver.go b/rpcserver.go index d3d3c518014..eeb8151893f 100644 --- a/rpcserver.go +++ b/rpcserver.go @@ -773,6 +773,7 @@ func (r *rpcServer) addDeps(ctx context.Context, s *server, EndorsementExperimentEnd, ) }, + ForwardingLog: s.miscDB.ForwardingLog(), } genInvoiceFeatures := func() *lnwire.FeatureVector { From 115a78d743738853f27b59b5a83a92c57c92ed0d Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 17:59:49 +0200 Subject: [PATCH 08/10] cmd: add deletefwdhistory CLI command In this commit, we add a new lncli command for deleting forwarding history, providing a user-friendly interface to the underlying RPC. The command follows the pattern established by similar commands like deletepayments. Users can specify deletion criteria using either --duration for relative time ("--duration=-1M" for events older than one month) or --before for absolute Unix timestamps. The --batch_size flag allows tuning the deletion batch size for performance, though the default of 10k events per batch should work well for most deployments. The implementation includes an interactive confirmation prompt that displays exactly what will be deleted and requests explicit user confirmation. This safety measure helps prevent accidental deletion of important data. The prompt can be bypassed in scripted environments by piping "yes" to the command. After successful deletion, the command displays comprehensive statistics including the number of events deleted and total fees earned during that period. This fee information is critical for operators who need to maintain financial records for tax reporting even after purging detailed routing surveillance data for privacy. --- cmd/commands/cmd_payments.go | 126 +++++++++++++++++++++++++++++++++++ cmd/commands/main.go | 1 + 2 files changed, 127 insertions(+) diff --git a/cmd/commands/cmd_payments.go b/cmd/commands/cmd_payments.go index d13b52da2cd..61bcd95a26f 100644 --- a/cmd/commands/cmd_payments.go +++ b/cmd/commands/cmd_payments.go @@ -1936,6 +1936,132 @@ func deletePayments(ctx *cli.Context) error { return nil } +var deleteFwdHistoryCommand = cli.Command{ + Name: "deletefwdhistory", + Category: "Payments", + Usage: "Delete old forwarding history for privacy.", + ArgsUsage: "duration | before", + Description: ` + Deletes forwarding history events older than a specified time. This is + useful for implementing data retention policies for privacy purposes. The + command permanently removes old forwarding events from the database and + returns statistics about the deletion including total fees earned. + + Time can be specified in two ways: + 1. Relative duration (standard Go or custom units): e.g., "-1w", "-24h", "-1M" + 2. Absolute Unix timestamp: e.g., "1640995200" + + Supported relative time units: + - Standard Go: ns, us/µs, ms, s, m, h (e.g., "-24h", "-1.5h") + - Custom units: d (days), w (weeks), M (months=30.44d), y (years=365.25d) + + Examples: + lncli deletefwdhistory --duration="-1M" # Delete events older than ~1 month + lncli deletefwdhistory --duration="-720h" # Delete events older than ~1 month (same) + lncli deletefwdhistory --before=1640995200 # Delete events before Jan 1, 2022 + lncli deletefwdhistory --duration="-1y" --batch_size=5000 # ~1 year + + NOTE: As with deletepayments, removing events from the database frees up + disk space within bbolt, but that space is only reclaimed after compacting + the database. Consider enabling auto-compaction (db.bolt.auto-compact=true). + + WARNING: This operation is irreversible. Deleted forwarding history cannot + be recovered. A minimum age validation is enforced to prevent accidental + deletion of very recent data. + `, + Flags: []cli.Flag{ + cli.StringFlag{ + Name: "duration", + Usage: "delete events older than this relative duration " + + `(e.g., "-1w", "-1M", "-24h", "-720h")`, + }, + cli.Uint64Flag{ + Name: "before", + Usage: "delete events before this Unix timestamp (seconds)", + }, + cli.Uint64Flag{ + Name: "batch_size", + Usage: "number of events to delete per database transaction " + + "(default: 10000, max: 50000)", + }, + }, + Action: actionDecorator(deleteFwdHistory), +} + +func deleteFwdHistory(ctx *cli.Context) error { + ctxc := getContext() + conn := getClientConn(ctx, false) + defer conn.Close() + + client := routerrpc.NewRouterClient(conn) + + // Show command help if no arguments or flags are provided. + if ctx.NArg() > 0 || (!ctx.IsSet("duration") && !ctx.IsSet("before")) { + _ = cli.ShowCommandHelp(ctx, "deletefwdhistory") + return nil + } + + // User must specify exactly one of duration or before. + if ctx.IsSet("duration") && ctx.IsSet("before") { + return fmt.Errorf("cannot use both --duration and --before; " + + "specify one time parameter") + } + + req := &routerrpc.DeleteForwardingHistoryRequest{} + + switch { + case ctx.IsSet("duration"): + req.TimeSpec = &routerrpc.DeleteForwardingHistoryRequest_Duration{ + Duration: ctx.String("duration"), + } + + case ctx.IsSet("before"): + req.TimeSpec = &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: ctx.Uint64("before"), + } + + default: + return fmt.Errorf("either --duration or --before must be specified") + } + + if ctx.IsSet("batch_size") { + req.BatchSize = uint32(ctx.Uint64("batch_size")) + } + + fmt.Println("WARNING: This operation is irreversible " + + "and will permanently delete forwarding history.") + fmt.Print("Proceed? (yes/no): ") + + var response string + _, err := fmt.Scanln(&response) + if err != nil { + return fmt.Errorf("failed to read confirmation: %w", err) + } + + if response != "yes" { + fmt.Println("Operation cancelled.") + return nil + } + + fmt.Println("Deleting forwarding history, this may take a while...") + + resp, err := client.DeleteForwardingHistory(ctxc, req) + if err != nil { + return fmt.Errorf( + "failed to delete forwarding history: %w", err, + ) + } + + fmt.Printf("\nDeletion complete:\n") + fmt.Printf(" Events deleted: %d\n", resp.EventsDeleted) + fmt.Printf(" Total fees: %d msat (%.8f BTC)\n", + resp.TotalFeeMsat, + float64(resp.TotalFeeMsat)/100000000000.0) + fmt.Printf(" Status: %s\n", resp.Status) + + return nil +} + var estimateRouteFeeCommand = cli.Command{ Name: "estimateroutefee", Category: "Payments", diff --git a/cmd/commands/main.go b/cmd/commands/main.go index a11b63b9d33..dc9b993de57 100644 --- a/cmd/commands/main.go +++ b/cmd/commands/main.go @@ -497,6 +497,7 @@ func Main() { feeReportCommand, updateChannelPolicyCommand, forwardingHistoryCommand, + deleteFwdHistoryCommand, exportChanBackupCommand, verifyChanBackupCommand, restoreChanBackupCommand, From 26aa64909bd0e8eb298380d2b2432837a50ab4f1 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 18:00:04 +0200 Subject: [PATCH 09/10] itest: add comprehensive integration tests for deletion MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In this commit, we add end-to-end integration tests that exercise the complete forwarding history deletion flow through multi-node Lightning Network topologies. The tests verify the feature works correctly in realistic scenarios with actual payment routing and database operations. We implement five distinct test scenarios. The basic deletion test creates a three-node network (Alice → Bob → Carol), routes multiple payments through Bob to generate forwarding events, then verifies that deletion works correctly with accurate event counts and fee calculations. The partial deletion test validates that only events before a specific cutoff time are deleted, leaving newer events intact. The empty database test ensures graceful handling when no events exist. The idempotency test confirms that repeated deletions with the same parameters safely do nothing after the first deletion. Finally, the time formats test validates both absolute timestamp and relative duration specifications work correctly. A critical implementation detail is timing. The minimum age validation requires events to be at least 1 second old before deletion. To satisfy this in tests without excessive delays, we sleep for 1 second after each payment, then use a timestamp 2 seconds in the past for deletion. This ensures events are old enough while keeping total test time under 125 seconds for all five scenarios. --- itest/list_on_test.go | 4 + itest/lnd_forward_delete_test.go | 430 +++++++++++++++++++++++++++++++ 2 files changed, 434 insertions(+) create mode 100644 itest/lnd_forward_delete_test.go diff --git a/itest/list_on_test.go b/itest/list_on_test.go index 92c6547b3af..7e095056e64 100644 --- a/itest/list_on_test.go +++ b/itest/list_on_test.go @@ -443,6 +443,10 @@ var allTestCases = []*lntest.TestCase{ Name: "forward interceptor restart", TestFunc: testForwardInterceptorRestart, }, + { + Name: "delete forwarding history", + TestFunc: testDeleteForwardingHistory, + }, { Name: "invoice HTLC modifier basic", TestFunc: testInvoiceHtlcModifierBasic, diff --git a/itest/lnd_forward_delete_test.go b/itest/lnd_forward_delete_test.go new file mode 100644 index 00000000000..c1596ef9da5 --- /dev/null +++ b/itest/lnd_forward_delete_test.go @@ -0,0 +1,430 @@ +package itest + +import ( + "fmt" + "testing" + "time" + + "github.com/btcsuite/btcd/btcutil" + "github.com/lightningnetwork/lnd/lnrpc" + "github.com/lightningnetwork/lnd/lnrpc/routerrpc" + "github.com/lightningnetwork/lnd/lntest" + "github.com/stretchr/testify/require" +) + +// testDeleteForwardingHistory tests the deletion of forwarding history events. +func testDeleteForwardingHistory(ht *lntest.HarnessTest) { + // Run subtests for different deletion scenarios. + testCases := []struct { + name string + test func(ht *lntest.HarnessTest) + }{ + { + name: "basic deletion", + test: testBasicDeletion, + }, + { + name: "partial deletion", + test: testPartialDeletion, + }, + { + name: "empty database", + test: testEmptyDatabaseDeletion, + }, + { + name: "idempotency", + test: testDeletionIdempotency, + }, + { + name: "time formats", + test: testTimeFormats, + }, + } + + for _, tc := range testCases { + tc := tc + success := ht.Run(tc.name, func(t *testing.T) { + st := ht.Subtest(t) + tc.test(st) + }) + + if !success { + return + } + } +} + +// testBasicDeletion tests basic forwarding history deletion functionality. +func testBasicDeletion(ht *lntest.HarnessTest) { + // Create a three-hop network: Alice -> Bob -> Carol. + const chanAmt = btcutil.Amount(300000) + p := lntest.OpenChannelParams{Amt: chanAmt} + + cfgs := [][]string{nil, nil, nil} + chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, p) + alice, bob, carol := nodes[0], nodes[1], nodes[2] + _ = chanPoints + + const numPayments = 10 + const paymentAmt = 1000 + + // Send multiple payments from Alice to Carol through Bob. Sleep after + // each payment to ensure minimum age validation. + for i := 0; i < numPayments; i++ { + invoice := carol.RPC.AddInvoice(&lnrpc.Invoice{ + ValueMsat: paymentAmt, + Memo: fmt.Sprintf("test payment %d", i), + }) + + payReq := &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + FeeLimitMsat: 100000, + } + + ht.SendPaymentAssertSettled(alice, payReq) + + // Sleep to ensure events are old enough. + time.Sleep(time.Second) + } + + // Sleep an additional 2 seconds to ensure all events are old enough. + time.Sleep(2 * time.Second) + + // Query Bob's forwarding history to verify events exist. + fwdHistory := bob.RPC.ForwardingHistory(nil) + require.Len( + ht, fwdHistory.ForwardingEvents, numPayments, + "expected %d forwarding events", numPayments, + ) + + // Calculate expected total fees. + var expectedFees int64 + for _, event := range fwdHistory.ForwardingEvents { + expectedFees += int64(event.FeeMsat) + } + + // Record the timestamp of the last event for testing. + // + //nolint:lll + lastTimestamp := fwdHistory.ForwardingEvents[len(fwdHistory.ForwardingEvents)-1].TimestampNs + + // Delete all forwarding events using a timestamp that's 2 seconds in + // the past to satisfy the minimum age validation. + delResp := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: uint64(time.Now().Add( + -2 * time.Second).Unix(), + ), + }, + }, + ) + + // Verify deletion statistics. + require.Equal( + ht, uint64(numPayments), delResp.EventsDeleted, + "wrong number of events deleted", + ) + require.Equal( + ht, expectedFees, delResp.TotalFeeMsat, + "wrong total fees", + ) + require.Contains( + ht, delResp.Status, "Successfully deleted", + "unexpected status message", + ) + + // Query forwarding history again to verify events are deleted. + fwdHistoryAfter := bob.RPC.ForwardingHistory(nil) + require.Empty( + ht, fwdHistoryAfter.ForwardingEvents, + "forwarding events should be deleted", + ) + + // Verify that the last event timestamp is no longer in the history. + fwdHistorySpecific := bob.RPC.ForwardingHistory( + &lnrpc.ForwardingHistoryRequest{ + StartTime: 0, + EndTime: lastTimestamp, + }, + ) + require.Empty( + ht, fwdHistorySpecific.ForwardingEvents, + "specific time range query should return no events", + ) +} + +// testPartialDeletion tests deleting only a subset of forwarding events. +func testPartialDeletion(ht *lntest.HarnessTest) { + // Create a three-hop network: Alice -> Bob -> Carol. + const chanAmt = btcutil.Amount(300000) + p := lntest.OpenChannelParams{Amt: chanAmt} + + cfgs := [][]string{nil, nil, nil} + chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, p) + alice, bob, carol := nodes[0], nodes[1], nodes[2] + _ = chanPoints + + const firstBatch = 5 + const paymentAmt = 1000 + + // Send first batch of payments. + for i := 0; i < firstBatch; i++ { + invoice := carol.RPC.AddInvoice(&lnrpc.Invoice{ + ValueMsat: paymentAmt, + Memo: fmt.Sprintf("batch 1 payment %d", i), + }) + + payReq := &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + FeeLimitMsat: 100000, + } + + ht.SendPaymentAssertSettled(alice, payReq) + + // Sleep to ensure events are old enough. + time.Sleep(time.Second) + } + + // Record the timestamp after first batch. + cutoffTime := time.Now() + + // Send a second batch of payments. + const secondBatch = 5 + for i := 0; i < secondBatch; i++ { + invoice := carol.RPC.AddInvoice(&lnrpc.Invoice{ + ValueMsat: paymentAmt, + Memo: fmt.Sprintf("batch 2 payment %d", i), + }) + + payReq := &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + FeeLimitMsat: 100000, + } + + ht.SendPaymentAssertSettled(alice, payReq) + } + + // Query Bob's forwarding history to verify all events exist. + fwdHistory := bob.RPC.ForwardingHistory(nil) + require.Len( + ht, fwdHistory.ForwardingEvents, firstBatch+secondBatch, + "expected total events before deletion", + ) + + // Delete only the first batch of events using the cutoff time. + delResp := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: uint64(cutoffTime.Unix()), + }, + }, + ) + + // Should have deleted approximately the first batch. + require.LessOrEqual( + ht, delResp.EventsDeleted, uint64(firstBatch), + "deleted more events than expected", + ) + require.Greater( + ht, delResp.EventsDeleted, uint64(0), + "should have deleted some events", + ) + + // Query forwarding history to verify second batch remains. + fwdHistoryAfter := bob.RPC.ForwardingHistory(nil) + require.NotEmpty( + ht, fwdHistoryAfter.ForwardingEvents, + "some forwarding events should remain", + ) + require.GreaterOrEqual( + ht, len(fwdHistoryAfter.ForwardingEvents), secondBatch-1, + "at least most of second batch should remain", + ) +} + +// testEmptyDatabaseDeletion tests deletion on an empty forwarding log. +func testEmptyDatabaseDeletion(ht *lntest.HarnessTest) { + // Create a standalone node (no channels, no forwards). + bob := ht.NewNode("Bob", nil) + + // Try to delete from empty database using custom duration format. + delResp := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_Duration{ + Duration: "-1d", + }, + }, + ) + + // Should successfully handle empty database. + require.Equal( + ht, uint64(0), delResp.EventsDeleted, + "should delete 0 events from empty database", + ) + require.Equal( + ht, int64(0), delResp.TotalFeeMsat, + "should have 0 fees from empty database", + ) +} + +// testDeletionIdempotency tests that deletion is idempotent. +func testDeletionIdempotency(ht *lntest.HarnessTest) { + // Create a three-hop network: Alice -> Bob -> Carol. + const chanAmt = btcutil.Amount(300000) + p := lntest.OpenChannelParams{Amt: chanAmt} + + cfgs := [][]string{nil, nil, nil} + chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, p) + alice, bob, carol := nodes[0], nodes[1], nodes[2] + _ = chanPoints + + // Send a few payments to create forwarding events. + const numPayments = 5 + const paymentAmt = 1000 + + for i := 0; i < numPayments; i++ { + invoice := carol.RPC.AddInvoice(&lnrpc.Invoice{ + ValueMsat: paymentAmt, + Memo: fmt.Sprintf("payment %d", i), + }) + + payReq := &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + FeeLimitMsat: 100000, + } + + ht.SendPaymentAssertSettled(alice, payReq) + + // Sleep to ensure events are old enough. + time.Sleep(time.Second) + } + + // Sleep an additional 2 seconds to ensure all events are old enough. + time.Sleep(2 * time.Second) + + // Verify events exist. + fwdHistory := bob.RPC.ForwardingHistory(nil) + require.Len( + ht, fwdHistory.ForwardingEvents, numPayments, + "expected forwarding events before deletion", + ) + + // Delete all events using a timestamp 2 seconds in the past. + deleteTime := uint64(time.Now().Add(-2 * time.Second).Unix()) + + delResp1 := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: deleteTime, + }, + }, + ) + + require.Equal( + ht, uint64(numPayments), delResp1.EventsDeleted, + "first deletion should delete all events", + ) + + // Delete again with same parameters. + delResp2 := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: deleteTime, + }, + }, + ) + + // Second deletion should delete nothing (idempotent). + require.Equal( + ht, uint64(0), delResp2.EventsDeleted, + "second deletion should delete 0 events (idempotent)", + ) + require.Equal( + ht, int64(0), delResp2.TotalFeeMsat, + "second deletion should have 0 fees", + ) +} + +// testTimeFormats tests different time specification formats. +func testTimeFormats(ht *lntest.HarnessTest) { + // Create a three-hop network: Alice -> Bob -> Carol. + const chanAmt = btcutil.Amount(300000) + p := lntest.OpenChannelParams{Amt: chanAmt} + + cfgs := [][]string{nil, nil, nil} + chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, p) + alice, bob, carol := nodes[0], nodes[1], nodes[2] + _ = chanPoints + + // Helper function to create forwarding events. + createForwards := func(count int) { + for i := 0; i < count; i++ { + invoice := carol.RPC.AddInvoice(&lnrpc.Invoice{ + ValueMsat: 1000, + Memo: fmt.Sprintf("payment %d", i), + }) + + payReq := &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + FeeLimitMsat: 100000, + } + + ht.SendPaymentAssertSettled(alice, payReq) + + // Sleep to ensure events are old enough. + time.Sleep(time.Second) + } + + // Sleep an additional 2 seconds to ensure all events are old + // enough. + time.Sleep(2 * time.Second) + } + + // Test relative duration format. + createForwards(3) + + // Use duration format. Events are just created, so "-1d" (1 day ago) + // will not delete them. + delResp := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_Duration{ + Duration: "-1d", + }, + }, + ) + + // Should delete nothing since events are recent. + require.Equal( + ht, uint64(0), delResp.EventsDeleted, + "recent events should not be deleted with -1d duration", + ) + + // Test absolute timestamp format. Query current events and use a + // timestamp 2 seconds in the past. + fwdHistory2 := bob.RPC.ForwardingHistory(nil) + require.Len( + ht, fwdHistory2.ForwardingEvents, 3, + "expected 3 events before second deletion", + ) + + delResp2 := bob.RPC.DeleteForwardingHistory( + &routerrpc.DeleteForwardingHistoryRequest{ + TimeSpec: &routerrpc.DeleteForwardingHistoryRequest_DeleteBeforeTime{ + DeleteBeforeTime: uint64( + time.Now().Add(-2 * time.Second).Unix(), + ), + }, + }, + ) + + require.Equal( + ht, uint64(3), delResp2.EventsDeleted, + "absolute timestamp should delete all events", + ) +} From 017299fe6f3aec3d8c7ece84c383a47da59862f0 Mon Sep 17 00:00:00 2001 From: Olaoluwa Osuntokun Date: Thu, 23 Oct 2025 18:00:20 +0200 Subject: [PATCH 10/10] docs: add comprehensive privacy guide for forwarding history In this commit, we add detailed documentation explaining the privacy implications of forwarding history retention and how to use the new deletion feature effectively. The document is written in natural prose with technical depth appropriate for node operators and LSPs. The guide begins by explaining why this feature matters. Lightning routing nodes accumulate detailed surveillance data about payment flows over time. While this data is useful for debugging and analytics, it poses significant privacy risks if the node is compromised or subpoenaed. For LSPs handling customer payments, retention of detailed forwarding logs may conflict with data protection regulations like GDPR. The deletion feature allows operators to implement sensible retention policies without the extreme measure of migrating to a new node instance. We include two mermaid diagrams to visualize the system. The sequence diagram shows the complete RPC flow including batch processing and fee calculation. The graph diagram illustrates how fees are accumulated from individual events during deletion to provide aggregate financial records. The usage section provides concrete examples for common scenarios: deleting old data on a regular schedule, one-time historical purges, and automated cron-based cleanup. We explain both time specification formats (relative durations and absolute timestamps) with examples of when each is appropriate. The document also covers automation strategies, troubleshooting common issues, performance characteristics of batch deletion, and legal/compliance considerations. We emphasize best practices like maintaining separate financial records, testing deletion policies in staging environments, and understanding that deletion is permanent and irreversible. This documentation ensures operators can use the feature safely and effectively while understanding the privacy and compliance trade-offs involved. --- docs/forwarding_history_privacy.md | 402 +++++++++++++++++++++++++++++ 1 file changed, 402 insertions(+) create mode 100644 docs/forwarding_history_privacy.md diff --git a/docs/forwarding_history_privacy.md b/docs/forwarding_history_privacy.md new file mode 100644 index 00000000000..47831b63b6e --- /dev/null +++ b/docs/forwarding_history_privacy.md @@ -0,0 +1,402 @@ +# Forwarding History Privacy Management + +## Introduction + +The Lightning Network excels at providing fast, low-cost payments with strong +privacy properties. However, routing nodes and Lightning Service Providers +(LSPs) face a unique challenge: their operational databases accumulate +forwarding history that, if compromised or subpoenaed, could reveal sensitive +information about payment flows across the network. This document explores the +privacy implications of forwarding logs and introduces LND's solution for +implementing data retention policies without migrating to a new node instance. + +## Understanding Forwarding History + +When your LND node routes a payment between two other nodes, it records detailed +information about that forwarding event in its database. This serves several +important operational purposes, including fee accounting, channel performance +analysis, and troubleshooting. Each forwarding event captures the incoming and +outgoing channels, amounts transferred, fees earned, and precise timestamps. + +Over months or years of operation, a busy routing node accumulates millions of +these records. While this historical data provides valuable insights into node +performance, it also creates a potential privacy liability. An attacker who +gains access to this database—whether through a security breach, or physical +seizure—could potentially reconstruct payment paths across the network by +correlating forwarding events across multiple compromised nodes. + +## Privacy Implications for Operators + +For individual routing node operators, the privacy risks of retaining unlimited +forwarding history are modest but real. If an adversary gains access to your +node's database, they could analyze your forwarding patterns to infer +information about the network topology you participate in and potentially +identify payment patterns involving your channels. + +### The Traditional Dilemma + +Prior to this feature, routing node operators faced an uncomfortable tradeoff. +To implement a data retention policy and purge old forwarding logs, the only +practical option was to shut down the node, reset the database, and restore +channels from backups—effectively migrating to a fresh node instance. This +process carries significant operational risks, including potential channel +closures, loss of channel state, and extended downtime. For LSPs serving +customers around the clock, such maintenance windows are highly disruptive. + +## The DeleteForwardingHistory Solution + +LND's `DeleteForwardingHistory` RPC addresses this challenge by providing a +safe, reversible-only-forward way to implement data retention policies. The +feature allows operators to specify a time threshold—either as a relative +duration or an absolute timestamp—and permanently delete all forwarding events +older than that threshold. The deletion operation executes in configurable +batches to avoid holding large database locks, and it returns statistics about +the deleted events, including the total fees earned during that period for +accounting purposes. + +### How It Works + +The deletion mechanism operates at the database layer, directly manipulating the +forwarding log bucket in LND's embedded bbolt database. The forwarding log +stores events using nanosecond-precision timestamps as keys, which enables +efficient time-based range queries. When you invoke a deletion, LND constructs a +cursor-based iteration that walks through events in chronological order, +collecting keys for events older than your specified cutoff time. It then +deletes these events in batches, with each batch executed within its own +database transaction. + +```mermaid +sequenceDiagram + participant User + participant CLI + participant Router RPC + participant ForwardingLog + participant Database + + User->>CLI: deletefwdhistory --duration="-720h" + CLI->>Router RPC: DeleteForwardingHistory(duration: "-720h") + + Router RPC->>Router RPC: Parse duration → absolute time + Router RPC->>Router RPC: Validate minimum age (1 hour) + + loop For each batch (default: 10,000 events) + Router RPC->>ForwardingLog: DeleteForwardingEvents(endTime, batchSize) + ForwardingLog->>Database: Begin transaction + ForwardingLog->>Database: Iterate events < endTime + ForwardingLog->>ForwardingLog: Calculate fees for batch + ForwardingLog->>Database: Delete batch of keys + ForwardingLog->>Database: Commit transaction + end + + ForwardingLog->>Router RPC: Return stats (deleted count, total fees) + Router RPC->>CLI: DeleteForwardingHistoryResponse + CLI->>User: Display deletion results +``` + +This batched approach ensures that even nodes with millions of forwarding events +can safely purge old data without causing database performance issues. Each +batch completes within a separate transaction, limiting lock contention and +allowing other database operations to proceed between batches. + +### Security Considerations + +The implementation includes several safeguards to prevent accidental data loss. +First, the RPC enforces a minimum age requirement: you cannot delete events less +than one hour old. This prevents mishaps where an operator accidentally deletes +recent forwarding history due to a timestamp parsing error or misunderstanding +the time format. The CLI command additionally requires explicit confirmation +before proceeding with the deletion. + +Second, the RPC requires the "offchain:write" macaroon permission, treating +forwarding history deletion as a sensitive write operation similar to payment +deletion. This ensures that only authorized users can purge forwarding data. + +Third, the operation is logged extensively. LND writes detailed log messages +before and after each deletion operation, recording the time threshold, batch +size, number of events deleted, and total fees from the deleted period. These +audit trails help operators verify that deletions executed as intended. + +### Fee Accounting + +One critical requirement for LSPs implementing data retention policies is +maintaining accurate accounting records. Even after purging old forwarding +events for privacy reasons, operators need to know how much revenue their node +generated during those periods for tax reporting and business analytics. + +The deletion operation addresses this by calculating and returning the sum of +all fees earned from the deleted events. For each event, LND computes the fee as +the difference between the incoming and outgoing amounts, then aggregates these +fees across all deleted events. The response includes this total in +millisatoshis, allowing operators to record their earnings before purging the +detailed records. + +```mermaid +graph TD + A[Forwarding Event] --> B{Calculate Fee} + B --> C[Fee = AmtIn - AmtOut] + C --> D[Accumulate to TotalFees] + D --> E{More Events?} + E -->|Yes| A + E -->|No| F[Return Total to User] + F --> G[Operator Records
for Accounting] + G --> H[Delete Detailed Events] +``` + +This approach separates accounting data from operational surveillance data. You +can maintain aggregate financial records while minimizing the detailed +forwarding logs that pose privacy risks. + +## Usage Guide + +### Command Line Interface + +The `lncli deletefwdhistory` command provides the primary interface for +operators. The command accepts time specifications in two formats: relative +durations for convenience, or absolute Unix timestamps for precision. + +For most use cases, relative durations offer the most intuitive interface. To +implement a 90-day retention policy, you would periodically run: + +```bash +lncli deletefwdhistory --duration="-90d" +``` + +The supported time units cover a wide range of retention policies: + +- Seconds (`s`) and minutes (`m`) for testing or very short-term retention +- Hours (`h`) and days (`d`) for common operational timeframes +- Weeks (`w`) for weekly cleanup schedules +- Months (`M`, averaged to 30.44 days) for typical retention policies +- Years (`y`, averaged to 365.25 days) for long-term archives + +The minus sign prefix indicates you're specifying how far back in time to +delete. This convention matches the relative time syntax used elsewhere in LND +and makes the intent clear: "delete events from more than X time ago." + +For precise control, you can specify an absolute Unix timestamp: + +```bash +lncli deletefwdhistory --before=1704067200 +``` + +This deletes all events before January 1, 2024 00:00:00 UTC. Absolute timestamps +are particularly useful when implementing policies tied to specific dates, such +as calendar year boundaries for accounting purposes or regulatory compliance +deadlines. + +### Batch Size Tuning + +The `--batch_size` flag controls how many events are deleted per database +transaction. The default value of 10,000 provides a good balance for most nodes, +but you may want to adjust this based on your node's characteristics. + +For nodes with slower disk I/O or running on resource-constrained hardware, +reducing the batch size decreases the duration of each database lock, improving +responsiveness to concurrent operations: + +```bash +lncli deletefwdhistory --duration="-1M" --batch_size=5000 +``` + +Conversely, for nodes with fast SSDs and low concurrent load, increasing the +batch size can speed up the overall deletion process: + +```bash +lncli deletefwdhistory --duration="-1M" --batch_size=25000 +``` + +The implementation caps the maximum batch size at 50,000 to prevent excessively +large transactions from degrading database performance. + +### Automation and Scheduling + +Most operators will want to automate forwarding history cleanup rather than +running deletions manually. The command integrates naturally with cron jobs or +systemd timers. For a monthly cleanup maintaining a 90-day retention window: + +```bash +# Run at 3 AM on the first day of each month +0 3 1 * * /usr/local/bin/lncli deletefwdhistory --duration="-90d" >> /var/log/lnd/fwdhistory_cleanup.log 2>&1 +``` + +Note that the automated script omits the interactive confirmation prompt. In +production automation, you should implement additional safeguards such as +pre-deletion validation checks and alerting on unexpected results. + +For more sophisticated automation, consider implementing a script that: + +1. Queries current forwarding history statistics +2. Calculates the appropriate deletion threshold based on database size and growth rate +3. Executes the deletion +4. Records the fees returned for accounting +5. Monitors the resulting database size and alerts if disk space isn't reclaimed as expected + +### Database Compaction + +Deleting forwarding events frees space within LND's bbolt database, but this +space isn't immediately returned to the operating system. bbolt uses a +copy-on-write structure where deleted data leaves "free pages" that can be +reused for future writes, but the overall file size doesn't shrink until you +compact the database. + +LND supports automatic compaction via the configuration option: + +``` +db.bolt.auto-compact=true +``` + +With auto-compaction enabled, LND periodically performs compaction during normal +operation, typically triggered when the amount of free space exceeds a +threshold. However, after a large deletion operation, you may want to trigger +compaction immediately to reclaim disk space. + +The recommended approach is to schedule compaction shortly after your regular +deletion operations: + +1. Run `deletefwdhistory` to purge old events +2. Restart LND with `--db.bolt.auto-compact=true` if not already enabled +3. Monitor database file size to confirm space reclamation + +Be aware that database compaction requires free disk space equal to the current +database size during the operation, as it creates a new, compacted copy of the +database before replacing the original. + +## Integration with Existing Tools + +### Forwarding History Analysis + +The deletion operation doesn't interfere with LND's existing `forwardinghistory` +RPC, which allows you to query and analyze forwarding events. After a deletion, +queries for time ranges that have been purged will simply return no events for +those periods, while more recent events remain accessible. + +This means you can continue using analytical tools and scripts that query +forwarding history, but you should design them to handle sparse historical data +gracefully. Tools should not assume that forwarding history extends back to the +node's inception date. + +### Channel Analytics + +Similarly, channel performance analysis tools that rely on forwarding history +will only have access to events within your retention window. When evaluating +channel performance metrics like forwarding frequency or fee revenue, be mindful +that historical data before your retention cutoff is no longer available. + +For long-term performance tracking, consider aggregating statistics before +purging detailed events. You might maintain summary records showing weekly or +monthly aggregate forwarding counts and fees per channel, even after deleting +the individual event records. + +## Privacy Best Practices + +While the deletion feature provides operators with a mechanism to implement data +retention policies, it's important to understand what it does and doesn't +protect against. + +### What Deletion Protects + +Deleting old forwarding history reduces your node's exposure if the database is +compromised in the future. An attacker who gains access to your node after +you've implemented a 90-day retention policy can only observe the last 90 days +of forwarding activity, not the entire operational history. This limits the +window during which surveillance or correlation attacks could be performed using +your node's data. + +### What Deletion Doesn't Protect + +The revocation log for _active_ channels contains information that can be used +to reconstruct transaction flows. Once channels are closed, this data is +automatically deleted. + +The normal logs of a node also contain information that can be used to correlate +transactions. Users can set up automated systems to manually purge logs, or +configure the logging directory to a purely in-memory file system. + +### Defense in Depth + +Forwarding history deletion should be one component of a comprehensive privacy +strategy, not your only defense. Other important measures include: + +- Restricting physical and network access to the node +- Implementing strong authentication and access controls +- Regularly auditing who has access to the node and its backups +- Using channel aliases and avoiding personally identifiable information in + channel names +- Running your node over Tor to hide the network-level correlation between node + identity and IP address + + +The deletion feature gives you control over how long your node retains detailed +forwarding records, but it doesn't eliminate all privacy risks inherent in +operating a Lightning Network routing node. + +## Troubleshooting + +### Database Lock Timeouts + +During deletion of very large numbers of events, you might encounter database +lock timeout errors if other operations are trying to access the database +concurrently. If this occurs: + +1. Reduce the batch size to shorten each transaction +2. Schedule deletions during low-traffic periods +3. Temporarily pause other operations that query forwarding history frequently + +### Insufficient Disk Space for Compaction + +Database compaction requires temporary free space roughly equal to the size of +your database. If compaction fails due to insufficient disk space, you'll need +to free up space before the compaction can proceed: + +1. Delete other unnecessary files from the disk +2. Move log files or other non-critical data to alternate storage +3. Consider whether you can safely delete older database backups + +## Performance Considerations + +Deletion performance scales linearly with the number of events being deleted. On +a node with fast SSD storage, expect deletion rates of approximately 100,000 +events per second with default batch sizes. A typical cleanup deleting one +million events should complete in under a minute. + +The operation's impact on node performance during deletion is minimal. Each +batch executes quickly, and the gaps between batches allow other database +operations to proceed. You can safely run deletions while the node is actively +routing payments, though you may want to avoid doing so during peak traffic +times on very busy nodes. + +Database compaction has a more significant performance impact, as it requires +LND to copy the entire database. During compaction, expect elevated CPU and disk +I/O, and budget several minutes for the operation to complete depending on your +database size. LND remains operational during compaction, but you may observe +increased latency for database-heavy operations. + +## Future Enhancements + +The current implementation provides the core functionality needed for +privacy-conscious forwarding history management, but several enhancements could +further improve the feature: + +**Selective Deletion**: Future versions might support deleting events based on +criteria beyond just time, such as deleting forwards below a certain value +threshold or forwards involving specific channels. This would allow more nuanced +retention policies that preserve high-value or otherwise interesting events +while purging routine traffic. + +**Automatic Scheduled Deletion**: Rather than requiring operators to set up +external cron jobs, LND could include built-in support for configuring retention +policies that execute automatically. The configuration might specify a retention +period and check interval, with the daemon handling cleanup internally. + +**Privacy-Preserving Aggregates**: Instead of deleting forwarding history +entirely, the system could support automatically aggregating old events into +coarser summaries that preserve analytical value while reducing privacy +exposure. For example, events older than 90 days could be combined into +per-channel weekly statistics, retaining information about channel performance +without preserving individual forwarding events. + +**Encrypted Archives**: For operators who need to preserve old forwarding data +for compliance but want to minimize its exposure, LND could support encrypting +and archiving old events before deleting them from the active database. The +encrypted archives could be decrypted only when required for audits, providing a +balance between compliance and privacy.