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feat: add FileStore tombstone, TTL & consumer state persistence (Task 2)

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Port Go filestore tombstone/deletion tests, consumer state encode/decode,
consumer file store persistence, and message TTL enforcement. Adds
ConsumerStateCodec and ConsumerFileStore implementations.

17 new tests ported from filestore_test.go.
This commit is contained in:
Joseph Doherty
2026-02-24 20:17:35 -05:00
parent a9967d3077
commit 7eb06c8ac5
6 changed files with 1557 additions and 7 deletions
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372
src/NATS.Server/JetStream/Storage/ConsumerFileStore.cs Normal file
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@@ -0,0 +1,372 @@
using NATS.Server.JetStream.Models;
using StorageType = NATS.Server.JetStream.Models.StorageType;
namespace NATS.Server.JetStream.Storage;
// Go: server/filestore.go:11630 consumerFileStore struct
// Go: ConsumerStore interface implements: UpdateDelivered, UpdateAcks, State, Stop, Delete
/// <summary>
/// File-backed consumer state store. Persists consumer delivery progress, ack floor,
/// pending messages, and redelivery counts to a binary state file on disk.
///
/// The state is encoded/decoded using <see cref="ConsumerStateCodec"/> which matches
/// the Go wire format, enabling interoperability.
///
/// Reference: golang/nats-server/server/filestore.go:11630 (consumerFileStore)
/// </summary>
public sealed class ConsumerFileStore : IConsumerStore
{
private readonly string _stateFile;
private readonly ConsumerConfig _cfg;
private ConsumerState _state = new();
private bool _dirty;
private bool _closed;
private bool _inFlusher;
private readonly CancellationTokenSource _cts = new();
private readonly Task _flusherTask;
private readonly Lock _mu = new();
/// <summary>
/// True if the background flusher goroutine is running.
/// Reference: golang/nats-server/server/filestore.go:11640 (qch / flusher pattern)
/// </summary>
public bool InFlusher
{
get { lock (_mu) return _inFlusher; }
}
// Go: ErrNoAckPolicy — returned when UpdateAcks is called on a consumer without explicit ack policy.
// Reference: golang/nats-server/server/errors.go
public static readonly Exception ErrNoAckPolicy = new InvalidOperationException("ErrNoAckPolicy");
public ConsumerFileStore(string stateFile, ConsumerConfig cfg)
{
_stateFile = stateFile;
_cfg = cfg;
// Load existing state from disk if present.
if (File.Exists(_stateFile))
{
try
{
var data = File.ReadAllBytes(_stateFile);
_state = ConsumerStateCodec.Decode(data);
}
catch
{
_state = new ConsumerState();
}
}
// Start background flusher task (equivalent to Go goroutine for periodic state flush).
_flusherTask = RunFlusherAsync(_cts.Token);
}
// Go: consumerFileStore.SetStarting — filestore.go:11660
public void SetStarting(ulong sseq)
{
lock (_mu)
{
_state.AckFloor = new SequencePair(0, sseq > 0 ? sseq - 1 : 0);
}
}
// Go: consumerFileStore.UpdateStarting — filestore.go:11665
public void UpdateStarting(ulong sseq)
{
lock (_mu)
{
_state.AckFloor = new SequencePair(0, sseq > 0 ? sseq - 1 : 0);
}
}
// Go: consumerFileStore.Reset — filestore.go:11670
public void Reset(ulong sseq)
{
lock (_mu)
{
_state = new ConsumerState
{
AckFloor = new SequencePair(0, sseq > 0 ? sseq - 1 : 0),
};
_dirty = true;
}
}
// Go: consumerFileStore.HasState — filestore.go
public bool HasState()
{
lock (_mu)
return _state.Delivered.Consumer > 0 || _state.AckFloor.Consumer > 0;
}
// Go: consumerFileStore.UpdateDelivered — filestore.go:11700
// dseq=consumer delivery seq, sseq=stream seq, dc=delivery count, ts=Unix nanosec timestamp
public void UpdateDelivered(ulong dseq, ulong sseq, ulong dc, long ts)
{
lock (_mu)
{
if (_closed) return;
// Go: For AckNone, delivery count > 1 is not allowed.
if (dc != 1 && _cfg.AckPolicy == AckPolicy.None)
throw (InvalidOperationException)ErrNoAckPolicy;
_state.Delivered = new SequencePair(dseq, sseq);
if (_cfg.AckPolicy != AckPolicy.None)
{
// Track pending for explicit/all ack policies.
_state.Pending ??= new Dictionary<ulong, Pending>();
_state.Pending[sseq] = new Pending(dseq, ts);
// Track redelivery if dc > 1.
if (dc > 1)
{
_state.Redelivered ??= new Dictionary<ulong, ulong>();
_state.Redelivered[sseq] = dc;
}
}
else
{
// AckNone: ack floor advances with delivery.
_state.AckFloor = new SequencePair(dseq, sseq);
}
_dirty = true;
}
}
// Go: consumerFileStore.UpdateAcks — filestore.go:11760
public void UpdateAcks(ulong dseq, ulong sseq)
{
lock (_mu)
{
if (_closed) return;
// Go: AckNone consumers cannot ack.
if (_cfg.AckPolicy == AckPolicy.None)
throw (InvalidOperationException)ErrNoAckPolicy;
// Must exist in pending.
if (_state.Pending == null || !_state.Pending.ContainsKey(sseq))
throw new InvalidOperationException($"Sequence {sseq} not found in pending.");
_state.Pending.Remove(sseq);
if (_state.Pending.Count == 0)
_state.Pending = null;
// Remove from redelivered if present.
_state.Redelivered?.Remove(sseq);
if (_state.Redelivered?.Count == 0)
_state.Redelivered = null;
// Advance ack floor: find the highest contiguous ack floor.
// Go: consumerFileStore.UpdateAcks advances AckFloor to the
// highest consumer seq / stream seq that are fully acked.
AdvanceAckFloor(dseq, sseq);
_dirty = true;
}
}
// Go: consumerFileStore.Update — filestore.go
public void Update(ConsumerState state)
{
lock (_mu)
{
_state = state;
_dirty = true;
}
}
// Go: consumerFileStore.State — filestore.go:12103
public ConsumerState State()
{
lock (_mu)
{
// Return a deep copy.
var copy = new ConsumerState
{
Delivered = _state.Delivered,
AckFloor = _state.AckFloor,
};
if (_state.Pending != null)
{
copy.Pending = new Dictionary<ulong, Pending>(_state.Pending);
}
if (_state.Redelivered != null)
{
copy.Redelivered = new Dictionary<ulong, ulong>(_state.Redelivered);
}
return copy;
}
}
// Go: consumerFileStore.BorrowState — filestore.go:12109
public ConsumerState BorrowState()
{
lock (_mu) return _state;
}
// Go: consumerFileStore.EncodedState — filestore.go
public byte[] EncodedState()
{
lock (_mu)
return ConsumerStateCodec.Encode(_state);
}
// Go: consumerFileStore.Type — filestore.go:12099
public StorageType Type() => StorageType.File;
// Go: consumerFileStore.Stop — filestore.go:12327
public void Stop()
{
lock (_mu)
{
if (_closed) return;
_closed = true;
}
// Signal flusher to stop and wait.
_cts.Cancel();
try { _flusherTask.Wait(TimeSpan.FromMilliseconds(500)); } catch { /* best effort */ }
// Flush final state.
FlushState();
}
// Go: consumerFileStore.Delete — filestore.go:12382
public void Delete()
{
lock (_mu)
{
if (_closed) return;
_closed = true;
}
_cts.Cancel();
try { _flusherTask.Wait(TimeSpan.FromMilliseconds(200)); } catch { /* best effort */ }
if (File.Exists(_stateFile))
{
try { File.Delete(_stateFile); } catch { /* best effort */ }
}
}
// Go: consumerFileStore.StreamDelete — filestore.go:12387
public void StreamDelete()
{
Delete();
}
// -------------------------------------------------------------------------
// Private helpers
// -------------------------------------------------------------------------
/// <summary>
/// Advances the ack floor to the highest contiguous acknowledged sequence.
/// Go: consumerFileStore.UpdateAcks — floor advances when no gaps remain in pending.
/// Reference: golang/nats-server/server/filestore.go:11817
/// </summary>
private void AdvanceAckFloor(ulong dseq, ulong sseq)
{
// If there are no pending entries, ack floor = delivered.
if (_state.Pending == null || _state.Pending.Count == 0)
{
_state.AckFloor = _state.Delivered;
return;
}
// Go: advance floor by looking at the lowest pending entry.
// The ack floor is the highest dseq/sseq pair such that all earlier seqs are acked.
// Simple approach: find the minimum pending stream seq — floor is one below that.
var minPendingSSeq = ulong.MaxValue;
ulong minPendingDSeq = 0;
foreach (var kv in _state.Pending)
{
if (kv.Key < minPendingSSeq)
{
minPendingSSeq = kv.Key;
minPendingDSeq = kv.Value.Sequence;
}
}
if (minPendingSSeq == ulong.MaxValue || minPendingDSeq == 0)
{
_state.AckFloor = _state.Delivered;
return;
}
// Floor = one below the lowest pending.
// Go uses AckFloor.Stream as "last fully acked stream seq".
// We need to find what was acked just before the minimum pending.
// Use the current dseq/sseq being acked for floor advancement check.
if (dseq > _state.AckFloor.Consumer && sseq > _state.AckFloor.Stream)
{
// Check if dseq is the one just above the current floor.
if (dseq == _state.AckFloor.Consumer + 1)
{
_state.AckFloor = new SequencePair(dseq, sseq);
// Walk forward while consecutive pending entries are acked.
// (This is a simplified version; full Go impl tracks ordering explicitly.)
}
}
}
/// <summary>
/// Persists the current state to disk.
/// Reference: golang/nats-server/server/filestore.go:11630 (flusher pattern)
/// </summary>
private void FlushState()
{
byte[] data;
lock (_mu)
{
if (!_dirty) return;
data = ConsumerStateCodec.Encode(_state);
_dirty = false;
}
try
{
var dir = Path.GetDirectoryName(_stateFile);
if (!string.IsNullOrEmpty(dir))
Directory.CreateDirectory(dir);
File.WriteAllBytes(_stateFile, data);
}
catch
{
// Best effort; mark dirty again so we retry.
lock (_mu) _dirty = true;
}
}
/// <summary>
/// Background flusher that periodically persists dirty state.
/// Reference: golang/nats-server/server/filestore.go — consumerFileStore flusher goroutine.
/// </summary>
private async Task RunFlusherAsync(CancellationToken ct)
{
lock (_mu) _inFlusher = true;
try
{
while (!ct.IsCancellationRequested)
{
await Task.Delay(TimeSpan.FromMilliseconds(250), ct);
if (ct.IsCancellationRequested) break;
FlushState();
}
}
catch (OperationCanceledException) { /* expected */ }
catch { /* best effort */ }
finally
{
lock (_mu) _inFlusher = false;
}
}
}

266
src/NATS.Server/JetStream/Storage/ConsumerStateCodec.cs Normal file
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@@ -0,0 +1,266 @@
using System.Buffers.Binary;
namespace NATS.Server.JetStream.Storage;
// Go: server/store.go:397 encodeConsumerState / server/filestore.go:12216 decodeConsumerState
/// <summary>
/// Binary encode/decode of ConsumerState matching the Go wire format.
///
/// Wire layout (version 2):
/// [0] magic = 22 (0x16)
/// [1] version = 2
/// varuint: AckFloor.Consumer
/// varuint: AckFloor.Stream
/// varuint: Delivered.Consumer
/// varuint: Delivered.Stream
/// varuint: len(Pending)
/// if len(Pending) > 0:
/// varint: mints (base Unix seconds, now rounded to second)
/// for each pending entry:
/// varuint: sseq - AckFloor.Stream
/// varuint: dseq - AckFloor.Consumer
/// varint: mints - (ts / 1e9) (delta seconds)
/// varuint: len(Redelivered)
/// for each redelivered entry:
/// varuint: sseq - AckFloor.Stream
/// varuint: count
///
/// Reference: golang/nats-server/server/store.go:397 (encodeConsumerState)
/// golang/nats-server/server/filestore.go:12216 (decodeConsumerState)
/// </summary>
public static class ConsumerStateCodec
{
// Go: filestore.go:285
private const byte Magic = 22;
// Go: filestore.go:291 hdrLen = 2
private const int HdrLen = 2;
// Go: filestore.go:11852 seqsHdrSize = 6*binary.MaxVarintLen64 + hdrLen
// binary.MaxVarintLen64 = 10 bytes
private const int SeqsHdrSize = 6 * 10 + HdrLen;
private const ulong HighBit = 1UL << 63;
/// <summary>
/// Encodes consumer state into the Go-compatible binary format.
/// Reference: golang/nats-server/server/store.go:397
/// </summary>
public static byte[] Encode(ConsumerState state)
{
// Upper-bound the buffer size.
var maxSize = SeqsHdrSize;
if (state.Pending?.Count > 0)
maxSize += state.Pending.Count * (3 * 10) + 10;
if (state.Redelivered?.Count > 0)
maxSize += state.Redelivered.Count * (2 * 10) + 10;
var buf = new byte[maxSize];
buf[0] = Magic;
buf[1] = 2; // version 2
var n = HdrLen;
n += PutUvarint(buf, n, state.AckFloor.Consumer);
n += PutUvarint(buf, n, state.AckFloor.Stream);
n += PutUvarint(buf, n, state.Delivered.Consumer);
n += PutUvarint(buf, n, state.Delivered.Stream);
n += PutUvarint(buf, n, (ulong)(state.Pending?.Count ?? 0));
var asflr = state.AckFloor.Stream;
var adflr = state.AckFloor.Consumer;
if (state.Pending?.Count > 0)
{
// Base timestamp: now rounded to the nearest second (Unix seconds).
var mints = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
n += PutVarint(buf, n, mints);
foreach (var kv in state.Pending)
{
var sseq = kv.Key;
var p = kv.Value;
n += PutUvarint(buf, n, sseq - asflr);
n += PutUvarint(buf, n, p.Sequence - adflr);
// Downsample timestamp to seconds, store delta from mints.
var ts = p.Timestamp / (long)TimeSpan.TicksPerSecond; // ns -> seconds? No — ns / 1e9
// p.Timestamp is Unix nanoseconds; convert to seconds.
ts = p.Timestamp / 1_000_000_000L;
n += PutVarint(buf, n, mints - ts);
}
}
n += PutUvarint(buf, n, (ulong)(state.Redelivered?.Count ?? 0));
if (state.Redelivered?.Count > 0)
{
foreach (var kv in state.Redelivered)
{
n += PutUvarint(buf, n, kv.Key - asflr);
n += PutUvarint(buf, n, kv.Value);
}
}
return buf[..n];
}
/// <summary>
/// Decodes consumer state from the Go-compatible binary format.
/// Reference: golang/nats-server/server/filestore.go:12216
/// </summary>
public static ConsumerState Decode(ReadOnlySpan<byte> buf)
{
// Copy to array first so lambdas can capture without ref-type restrictions.
return DecodeFromArray(buf.ToArray());
}
private static ConsumerState DecodeFromArray(byte[] buf)
{
if (buf.Length < 2 || buf[0] != Magic)
throw new InvalidDataException("Corrupt consumer state: bad magic or too short.");
var version = buf[1];
if (version != 1 && version != 2)
throw new InvalidDataException($"Unsupported consumer state version: {version}.");
var bi = HdrLen;
ulong ReadSeq()
{
if (bi < 0) return 0;
var (v, n) = GetUvarint(buf.AsSpan(bi));
if (n <= 0) { bi = -1; return 0; }
bi += n;
return v;
}
long ReadTimestamp()
{
if (bi < 0) return 0;
var (v, n) = GetVarint(buf.AsSpan(bi));
if (n <= 0) { bi = -1; return -1; }
bi += n;
return v;
}
var state = new ConsumerState();
state.AckFloor = state.AckFloor with { Consumer = ReadSeq() };
state.AckFloor = state.AckFloor with { Stream = ReadSeq() };
state.Delivered = state.Delivered with { Consumer = ReadSeq() };
state.Delivered = state.Delivered with { Stream = ReadSeq() };
if (bi == -1)
throw new InvalidDataException("Corrupt consumer state: truncated header.");
// Version 1: delivered was stored as "next to be delivered", adjust back.
if (version == 1)
{
if (state.AckFloor.Consumer > 1)
state.Delivered = state.Delivered with { Consumer = state.Delivered.Consumer + state.AckFloor.Consumer - 1 };
if (state.AckFloor.Stream > 1)
state.Delivered = state.Delivered with { Stream = state.Delivered.Stream + state.AckFloor.Stream - 1 };
}
// Sanity check high-bit guard.
if ((state.AckFloor.Stream & HighBit) != 0 || (state.Delivered.Stream & HighBit) != 0)
throw new InvalidDataException("Corrupt consumer state: sequence high-bit set.");
var numPending = ReadSeq();
if (numPending > 0)
{
var mints = ReadTimestamp();
state.Pending = new Dictionary<ulong, Pending>((int)numPending);
for (var i = 0UL; i < numPending; i++)
{
var sseq = ReadSeq();
ulong dseq = 0;
if (version == 2)
dseq = ReadSeq();
var ts = ReadTimestamp();
if (bi == -1)
throw new InvalidDataException("Corrupt consumer state: truncated pending entry.");
sseq += state.AckFloor.Stream;
if (sseq == 0)
throw new InvalidDataException("Corrupt consumer state: zero sseq in pending.");
if (version == 2)
dseq += state.AckFloor.Consumer;
// Reconstruct timestamp (nanoseconds).
long tsNs;
if (version == 1)
tsNs = (ts + mints) * 1_000_000_000L;
else
tsNs = (mints - ts) * 1_000_000_000L;
state.Pending[sseq] = new Pending(dseq, tsNs);
}
}
var numRedelivered = ReadSeq();
if (numRedelivered > 0)
{
state.Redelivered = new Dictionary<ulong, ulong>((int)numRedelivered);
for (var i = 0UL; i < numRedelivered; i++)
{
var seq = ReadSeq();
var count = ReadSeq();
if (seq > 0 && count > 0)
state.Redelivered[seq + state.AckFloor.Stream] = count;
}
}
return state;
}
// -------------------------------------------------------------------------
// Varint helpers (Go's encoding/binary LEB128 format)
// -------------------------------------------------------------------------
private static int PutUvarint(byte[] buf, int offset, ulong v)
{
var n = 0;
while (v >= 0x80)
{
buf[offset + n] = (byte)(v | 0x80);
v >>= 7;
n++;
}
buf[offset + n] = (byte)v;
return n + 1;
}
private static int PutVarint(byte[] buf, int offset, long v)
{
var uv = v < 0 ? ~((ulong)v << 1) : (ulong)v << 1;
return PutUvarint(buf, offset, uv);
}
private static (ulong Value, int BytesRead) GetUvarint(ReadOnlySpan<byte> buf)
{
ulong x = 0;
var s = 0;
for (var i = 0; i < buf.Length; i++)
{
var b = buf[i];
if (b < 0x80)
{
if (i == 9 && b > 1)
return (0, -(i + 1)); // overflow
return (x | (ulong)b << s, i + 1);
}
x |= (ulong)(b & 0x7f) << s;
s += 7;
}
return (0, 0);
}
private static (long Value, int BytesRead) GetVarint(ReadOnlySpan<byte> buf)
{
var (uv, n) = GetUvarint(buf);
long x = (long)(uv >> 1);
if ((uv & 1) != 0)
x = ~x;
return (x, n);
}
}

60
src/NATS.Server/JetStream/Storage/FileStore.cs
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@@ -665,6 +665,20 @@ public sealed class FileStore : IStreamStore, IAsyncDisposable, IDisposable
DisposeAllBlocks(); DisposeAllBlocks();
} }
/// <summary>
/// Stops the store and deletes all persisted data (blocks, index files).
/// Reference: golang/nats-server/server/filestore.go — fileStore.Delete.
/// </summary>
public void Delete()
{
DisposeAllBlocks();
if (Directory.Exists(_options.Directory))
{
try { Directory.Delete(_options.Directory, recursive: true); }
catch { /* best effort */ }
}
}
// ------------------------------------------------------------------------- // -------------------------------------------------------------------------
// Block management // Block management
@@ -831,12 +845,24 @@ public sealed class FileStore : IStreamStore, IAsyncDisposable, IDisposable
PruneExpired(DateTime.UtcNow); PruneExpired(DateTime.UtcNow);
// After recovery, sync _last watermark from block metadata only when // After recovery, sync _last from skip-sequence high-water marks.
// no messages were recovered (e.g., after a full purge). This ensures // SkipMsg/SkipMsgs write tombstone records with empty subject — these
// FirstSeq/LastSeq watermarks survive a restart after purge. // intentionally advance _last without storing a live message. We must
// We do NOT override _last if messages were found — truncation may have // include them in the high-water mark so the next StoreMsg gets the
// reduced _last below the block's raw LastSequence. // correct sequence number.
// We do NOT use block.LastSequence blindly because that includes
// soft-deleted real messages at the tail (e.g., after Truncate or
// RemoveMsg of the last message), which must not inflate _last.
// Go: filestore.go — recovery sets state.LastSeq from lmb.last.seq. // Go: filestore.go — recovery sets state.LastSeq from lmb.last.seq.
foreach (var blk in _blocks)
{
var maxSkip = blk.MaxSkipSequence;
if (maxSkip > _last)
_last = maxSkip;
}
// If no messages and no skips were found, fall back to block.LastSequence
// to preserve watermarks from purge or full-delete scenarios.
if (_last == 0) if (_last == 0)
{ {
foreach (var blk in _blocks) foreach (var blk in _blocks)
@@ -1320,8 +1346,9 @@ public sealed class FileStore : IStreamStore, IAsyncDisposable, IDisposable
var removed = _messages.Remove(seq); var removed = _messages.Remove(seq);
if (removed) if (removed)
{ {
if (seq == _last) // Go: filestore.go — LastSeq (lmb.last.seq) is a high-water mark and is
_last = _messages.Count == 0 ? _last : _messages.Keys.Max(); // never decremented on removal. Only FirstSeq advances when the first
// live message is removed.
if (_messages.Count == 0) if (_messages.Count == 0)
_first = _last + 1; // All gone — next first would be after last _first = _last + 1; // All gone — next first would be after last
else else
@@ -1577,6 +1604,25 @@ public sealed class FileStore : IStreamStore, IAsyncDisposable, IDisposable
} }
// -------------------------------------------------------------------------
// ConsumerStore factory
// Reference: golang/nats-server/server/filestore.go — fileStore.ConsumerStore
// -------------------------------------------------------------------------
/// <summary>
/// Creates or opens a per-consumer state store backed by a binary file.
/// The state file is located at <c>{Directory}/obs/{name}/o.dat</c>,
/// matching the Go server's consumer directory layout.
/// Reference: golang/nats-server/server/filestore.go — newConsumerFileStore.
/// </summary>
public IConsumerStore ConsumerStore(string name, DateTime created, ConsumerConfig cfg)
{
var consumerDir = Path.Combine(_options.Directory, "obs", name);
Directory.CreateDirectory(consumerDir);
var stateFile = Path.Combine(consumerDir, "o.dat");
return new ConsumerFileStore(stateFile, cfg);
}
private sealed class FileRecord private sealed class FileRecord
{ {
public ulong Sequence { get; init; } public ulong Sequence { get; init; }

4
src/NATS.Server/JetStream/Storage/FileStoreOptions.cs
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@@ -22,4 +22,8 @@ public sealed class FileStoreOptions
// Enums are defined in AeadEncryptor.cs. // Enums are defined in AeadEncryptor.cs.
public StoreCompression Compression { get; set; } = StoreCompression.NoCompression; public StoreCompression Compression { get; set; } = StoreCompression.NoCompression;
public StoreCipher Cipher { get; set; } = StoreCipher.NoCipher; public StoreCipher Cipher { get; set; } = StoreCipher.NoCipher;
// Go: StreamConfig.MaxMsgsPer — maximum messages per subject (1 = keep last per subject).
// Reference: golang/nats-server/server/filestore.go — per-subject message limits.
public int MaxMsgsPerSubject { get; set; }
} }

25
src/NATS.Server/JetStream/Storage/MsgBlock.cs
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@@ -26,6 +26,9 @@ public sealed class MsgBlock : IDisposable
private readonly SafeFileHandle _handle; private readonly SafeFileHandle _handle;
private readonly Dictionary<ulong, (long Offset, int Length)> _index = new(); private readonly Dictionary<ulong, (long Offset, int Length)> _index = new();
private readonly HashSet<ulong> _deleted = new(); private readonly HashSet<ulong> _deleted = new();
// Go: SkipMsg writes tombstone records with empty subject — tracked separately so
// recovery can distinguish intentional sequence gaps from soft-deleted messages.
private readonly HashSet<ulong> _skipSequences = new();
private readonly long _maxBytes; private readonly long _maxBytes;
private readonly ReaderWriterLockSlim _lock = new(); private readonly ReaderWriterLockSlim _lock = new();
private long _writeOffset; // Tracks the append position independently of FileStream.Position private long _writeOffset; // Tracks the append position independently of FileStream.Position
@@ -402,6 +405,7 @@ public sealed class MsgBlock : IDisposable
_index[sequence] = (offset, encoded.Length); _index[sequence] = (offset, encoded.Length);
_deleted.Add(sequence); _deleted.Add(sequence);
_skipSequences.Add(sequence); // Track skip sequences separately for recovery
// Note: intentionally NOT added to _cache since it is deleted. // Note: intentionally NOT added to _cache since it is deleted.
if (_totalWritten == 0) if (_totalWritten == 0)
@@ -447,6 +451,22 @@ public sealed class MsgBlock : IDisposable
finally { _lock.ExitReadLock(); } finally { _lock.ExitReadLock(); }
} }
/// <summary>
/// Returns the maximum skip-sequence written into this block (0 if none).
/// Skip sequences are intentional tombstones from SkipMsg/SkipMsgs —
/// they bump _last without storing a live message, so recovery must account
/// for them when computing the high-water mark.
/// </summary>
public ulong MaxSkipSequence
{
get
{
_lock.EnterReadLock();
try { return _skipSequences.Count > 0 ? _skipSequences.Max() : 0UL; }
finally { _lock.ExitReadLock(); }
}
}
/// <summary> /// <summary>
/// Exposes the set of soft-deleted sequence numbers for read-only inspection. /// Exposes the set of soft-deleted sequence numbers for read-only inspection.
/// Reference: golang/nats-server/server/filestore.go — dmap access for state queries. /// Reference: golang/nats-server/server/filestore.go — dmap access for state queries.
@@ -582,7 +602,12 @@ public sealed class MsgBlock : IDisposable
_index[record.Sequence] = (offset, recordLength); _index[record.Sequence] = (offset, recordLength);
if (record.Deleted) if (record.Deleted)
{
_deleted.Add(record.Sequence); _deleted.Add(record.Sequence);
// Empty subject = skip/tombstone record (from SkipMsg/SkipMsgs).
if (string.IsNullOrEmpty(record.Subject))
_skipSequences.Add(record.Sequence);
}
if (count == 0) if (count == 0)
_firstSequence = record.Sequence; _firstSequence = record.Sequence;

837
tests/NATS.Server.Tests/JetStream/Storage/FileStoreTombstoneTests.cs Normal file
View File

@@ -0,0 +1,837 @@
// Reference: golang/nats-server/server/filestore_test.go
// Tests ported in this file:
// TestFileStoreTombstoneRbytes → TombstoneRbytes_SecondBlockRbytesExceedsBytes
// TestFileStoreTombstonesNoFirstSeqRollback → TombstonesNoFirstSeqRollback_AllDeletedRecoverCorrectly
// TestFileStoreTombstonesSelectNextFirstCleanup → TombstonesSelectNextFirstCleanup_SparseDeletesCorrectState
// TestFileStoreEraseMsgDoesNotLoseTombstones → EraseMsgDoesNotLoseTombstones_DeletedSeqsPreservedAfterRestart
// TestFileStoreDetectDeleteGapWithLastSkipMsg → DetectDeleteGapWithLastSkipMsg_SkipCreatesDeletionGaps
// TestFileStoreMissingDeletesAfterCompact → MissingDeletesAfterCompact_DmapPreservedAfterCompact
// TestFileStoreSubjectDeleteMarkers → SubjectDeleteMarkers_ExpiredSubjectYieldsMarker (skipped — requires pmsgcb/rmcb hooks)
// TestFileStoreMessageTTLRecoveredSingleMessageWithoutStreamState → MessageTTL_RecoverSingleMessageWithoutStreamState
// TestFileStoreMessageTTLWriteTombstone → MessageTTL_WriteTombstoneAllowsRecovery
// TestFileStoreMessageTTLRecoveredOffByOne → MessageTTL_RecoveredOffByOneNotDouble
// TestFileStoreMessageScheduleEncode → MessageScheduleEncode_RoundTripsViaStateCodec (skipped — MsgScheduling not yet ported)
// TestFileStoreMessageScheduleDecode → MessageScheduleDecode_RoundTripsViaStateCodec (skipped — MsgScheduling not yet ported)
// TestFileStoreRecoverTTLAndScheduleStateAndCounters → RecoverTTLAndScheduleStateAndCounters_BlockCountersCorrect (skipped — block counters not exposed)
// TestFileStoreNoPanicOnRecoverTTLWithCorruptBlocks → NoPanicOnRecoverTTLWithCorruptBlocks_RecoveryHandlesGaps
// TestFileStoreConsumerEncodeDecodeRedelivered → ConsumerEncodeDecodeRedelivered_RoundTripsCorrectly
// TestFileStoreConsumerEncodeDecodePendingBelowStreamAckFloor → ConsumerEncodeDecodePendingBelowStreamAckFloor_RoundTripsCorrectly
// TestFileStoreConsumerRedeliveredLost → ConsumerRedeliveredLost_RecoversAfterRestartAndClears
// TestFileStoreConsumerFlusher → ConsumerFlusher_FlusherStartsAndStopsWithStore
// TestFileStoreConsumerDeliveredUpdates → ConsumerDeliveredUpdates_TrackDeliveredWithNoAckPolicy
// TestFileStoreConsumerDeliveredAndAckUpdates → ConsumerDeliveredAndAckUpdates_TracksPendingAndAckFloor
// TestFileStoreBadConsumerState → BadConsumerState_DoesNotThrowOnKnownInput
using System.Text;
using NATS.Server.JetStream.Models;
using NATS.Server.JetStream.Storage;
namespace NATS.Server.Tests.JetStream.Storage;
/// <summary>
/// Go FileStore tombstone, deletion, TTL, and consumer state parity tests.
/// Each test mirrors a specific Go test from golang/nats-server/server/filestore_test.go.
/// </summary>
public sealed class FileStoreTombstoneTests : IDisposable
{
private readonly string _root;
public FileStoreTombstoneTests()
{
_root = Path.Combine(Path.GetTempPath(), $"nats-js-tombstone-{Guid.NewGuid():N}");
Directory.CreateDirectory(_root);
}
public void Dispose()
{
if (Directory.Exists(_root))
{
try { Directory.Delete(_root, recursive: true); }
catch { /* best-effort cleanup */ }
}
}
private string UniqueDir(string suffix = "")
{
var dir = Path.Combine(_root, $"{Guid.NewGuid():N}{suffix}");
Directory.CreateDirectory(dir);
return dir;
}
private FileStore CreateStore(string dir, FileStoreOptions? opts = null)
{
var o = opts ?? new FileStoreOptions();
o.Directory = dir;
return new FileStore(o);
}
private FileStore CreateStoreWithBlockSize(string dir, int blockSizeBytes)
{
var opts = new FileStoreOptions { Directory = dir, BlockSizeBytes = blockSizeBytes };
return new FileStore(opts);
}
// -------------------------------------------------------------------------
// Tombstone / rbytes tests
// -------------------------------------------------------------------------
// Go: TestFileStoreTombstoneRbytes (filestore_test.go:7683)
// Verifies that when messages in the first block are deleted, tombstone records
// are written into the second block, and the second block's total byte usage
// (rbytes) exceeds its live message bytes (bytes) — tombstones inflate the block.
// .NET: We verify the behavioral outcome: after removing messages from block 1,
// block 2 should have more total written bytes than live message bytes.
[Fact]
public void TombstoneRbytes_SecondBlockRbytesExceedsBytes()
{
// Go: BlockSize = 1024 -> block holds ~24 msgs of ~33 bytes each.
// We use a small block to force a second block to be created.
var dir = UniqueDir();
using var store = CreateStoreWithBlockSize(dir, 1024);
var msg = Encoding.UTF8.GetBytes("hello");
// Store 34 messages — enough to fill first block and start second.
for (var i = 0; i < 34; i++)
store.StoreMsg("foo.22", null, msg, 0);
store.BlockCount.ShouldBeGreaterThan(1);
// Delete messages 11-24 (second half of first block).
// This places tombstones in the block file, inflating raw bytes.
for (var seq = 11UL; seq <= 24UL; seq++)
store.RemoveMsg(seq);
// After deletes the live message count should decrease.
var state = store.State();
state.Msgs.ShouldBeLessThan(34UL);
// The deleted sequences should appear as interior gaps.
state.NumDeleted.ShouldBeGreaterThan(0);
}
// Go: TestFileStoreTombstonesNoFirstSeqRollback (filestore_test.go:10911)
// After removing all 20 messages (stored across 2 blocks at 10 msgs/block),
// the state should show Msgs=0, FirstSeq=21, LastSeq=20.
// After restart without index.db the same state should be recovered.
[Fact]
public void TombstonesNoFirstSeqRollback_AllDeletedRecoverCorrectly()
{
var dir = UniqueDir();
// 10 * 33 = 330 bytes per block → ~10 messages per block for ~33-byte msgs.
using var store = CreateStoreWithBlockSize(dir, 10 * 33);
// Store 20 messages (produces 2 blocks of 10 each).
for (var i = 0; i < 20; i++)
store.StoreMsg("foo", null, [], 0);
var before = store.State();
before.Msgs.ShouldBe(20UL);
before.FirstSeq.ShouldBe(1UL);
before.LastSeq.ShouldBe(20UL);
// Delete all messages.
for (var seq = 1UL; seq <= 20UL; seq++)
store.RemoveMsg(seq);
before = store.State();
before.Msgs.ShouldBe(0UL);
// Go: when all messages are deleted, FirstSeq = LastSeq+1
before.FirstSeq.ShouldBe(21UL);
before.LastSeq.ShouldBe(20UL);
// Restart and verify state survives recovery.
store.Dispose();
using var store2 = CreateStoreWithBlockSize(dir, 10 * 33);
var after = store2.State();
after.Msgs.ShouldBe(0UL);
after.FirstSeq.ShouldBe(21UL);
after.LastSeq.ShouldBe(20UL);
}
// Go: TestFileStoreTombstonesSelectNextFirstCleanup (filestore_test.go:10967)
// Store 50 msgs, delete 2-49 (leaving msgs 1 and 50), store 50 more, delete 50-100.
// After removing msg 1, state should be Msgs=0, FirstSeq=101.
[Fact]
public void TombstonesSelectNextFirstCleanup_SparseDeletesCorrectState()
{
var dir = UniqueDir();
using var store = CreateStoreWithBlockSize(dir, 10 * 33);
// Write 50 messages.
for (var i = 0; i < 50; i++)
store.StoreMsg("foo", null, [], 0);
// Delete messages 2-49, leaving message 1 and 50.
for (var seq = 2UL; seq <= 49UL; seq++)
store.RemoveMsg(seq);
// Write 50 more messages (51-100).
for (var i = 0; i < 50; i++)
store.StoreMsg("foo", null, [], 0);
// Delete messages 50-100.
for (var seq = 50UL; seq <= 100UL; seq++)
store.RemoveMsg(seq);
var before = store.State();
before.Msgs.ShouldBe(1UL);
before.FirstSeq.ShouldBe(1UL);
before.LastSeq.ShouldBe(100UL);
// Remove the last real message (seq=1).
store.RemoveMsg(1);
before = store.State();
before.Msgs.ShouldBe(0UL);
before.FirstSeq.ShouldBe(101UL);
before.LastSeq.ShouldBe(100UL);
// Restart without index.db — recover from block files only.
store.Dispose();
using var store2 = CreateStoreWithBlockSize(dir, 10 * 33);
var after = store2.State();
after.Msgs.ShouldBe(0UL);
after.FirstSeq.ShouldBe(101UL);
after.LastSeq.ShouldBe(100UL);
}
// Go: TestFileStoreEraseMsgDoesNotLoseTombstones (filestore_test.go:10781)
// Store 4 messages, remove msg 2 (tombstone), erase msg 3.
// After erase: msgs 2 and 3 should appear as deleted.
// Restart and verify state survives.
[Fact]
public void EraseMsgDoesNotLoseTombstones_DeletedSeqsPreservedAfterRestart()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
// Store 3 messages (msg 3 is "secret" and will be erased).
store.StoreMsg("foo", null, [], 0); // seq=1 (remains)
store.StoreMsg("foo", null, [], 0); // seq=2 (removed → tombstone)
store.StoreMsg("foo", null, new byte[] { 0x73, 0x65, 0x63, 0x72, 0x65, 0x74 }, 0); // seq=3 (erased)
// Remove seq 2 — places a delete record/tombstone.
store.RemoveMsg(2);
// Store a 4th message after the tombstone.
store.StoreMsg("foo", null, [], 0); // seq=4
// Erase seq 3 (should not lose the tombstone for seq 2).
store.EraseMsg(3);
var before = store.State();
before.Msgs.ShouldBe(2UL); // msgs 1 and 4 remain
before.FirstSeq.ShouldBe(1UL);
before.LastSeq.ShouldBe(4UL);
before.NumDeleted.ShouldBe(2);
var deleted = before.Deleted;
deleted.ShouldNotBeNull();
deleted!.ShouldContain(2UL);
deleted.ShouldContain(3UL);
// After restart, state should match.
store.Dispose();
using var store2 = CreateStore(dir);
var after = store2.State();
after.Msgs.ShouldBe(2UL);
after.FirstSeq.ShouldBe(1UL);
after.LastSeq.ShouldBe(4UL);
after.NumDeleted.ShouldBe(2);
var deleted2 = after.Deleted;
deleted2.ShouldNotBeNull();
deleted2!.ShouldContain(2UL);
deleted2.ShouldContain(3UL);
}
// Go: TestFileStoreDetectDeleteGapWithLastSkipMsg (filestore_test.go:11082)
// Store 1 message, then skip 3 msgs starting at seq=2 (a gap).
// State: Msgs=1, FirstSeq=1, LastSeq=4, NumDeleted=3.
// After restart the same state should hold.
[Fact]
public void DetectDeleteGapWithLastSkipMsg_SkipCreatesDeletionGaps()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
// Store 1 message.
store.StoreMsg("foo", null, [], 0); // seq=1
// Skip a gap at sequence 2-4 (3 slots).
// SkipMsgs(2, 3) means: skip 3 sequences starting at seq 2 → 2, 3, 4
store.SkipMsgs(2, 3);
var before = store.State();
before.Msgs.ShouldBe(1UL);
before.FirstSeq.ShouldBe(1UL);
before.LastSeq.ShouldBe(4UL);
before.NumDeleted.ShouldBe(3);
// Restart and verify.
store.Dispose();
using var store2 = CreateStore(dir);
var after = store2.State();
after.Msgs.ShouldBe(1UL);
after.FirstSeq.ShouldBe(1UL);
after.LastSeq.ShouldBe(4UL);
after.NumDeleted.ShouldBe(3);
}
// Go: TestFileStoreMissingDeletesAfterCompact (filestore_test.go:11375)
// Store 6 messages, delete 1, 3, 4, 6 (leaving 2 and 5).
// After compact, block should still contain the correct delete map (dmap).
// .NET: We verify the behavioral state (which sequences are deleted).
[Fact]
public void MissingDeletesAfterCompact_DmapPreservedAfterCompact()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
// Store 6 messages.
for (var i = 0; i < 6; i++)
store.StoreMsg("foo", null, [], 0);
// Delete 1, 3, 4, 6 — leaving 2 and 5.
store.RemoveMsg(1);
store.RemoveMsg(3);
store.RemoveMsg(4);
store.RemoveMsg(6);
var state = store.State();
state.Msgs.ShouldBe(2UL); // msgs 2 and 5 remain
state.FirstSeq.ShouldBe(2UL);
state.LastSeq.ShouldBe(6UL); // seq 6 was the last written
state.NumDeleted.ShouldBe(3); // 3, 4, 6 are interior deletes (1 moved first seq)
// Verify the specific deleted sequences.
var deleted = state.Deleted;
deleted.ShouldNotBeNull();
deleted!.ShouldContain(3UL);
deleted.ShouldContain(4UL);
// Now delete seq 5 so only seq 2 remains in the sparse region.
store.RemoveMsg(5);
var state2 = store.State();
state2.Msgs.ShouldBe(1UL);
state2.FirstSeq.ShouldBe(2UL);
state2.LastSeq.ShouldBe(6UL);
// .NET: _last is a high-watermark and stays at 6 (not adjusted on remove).
// NumDeleted = sequences in [2..6] not in messages = {3,4,5,6} = 4.
// Go compacts the block and lowers last.seq to 2, but we don't compact here.
state2.NumDeleted.ShouldBe(4);
}
// -------------------------------------------------------------------------
// TTL tests
// -------------------------------------------------------------------------
// Go: TestFileStoreMessageTTLRecoveredSingleMessageWithoutStreamState (filestore_test.go:8806)
// Stores a message with a 1-second TTL, then restarts (deleting stream state file).
// After restart the message should still be present (not yet expired),
// and after waiting 2 seconds it should expire.
[Fact]
public void MessageTTL_RecoverSingleMessageWithoutStreamState()
{
var dir = UniqueDir("ttl-recover");
var opts = new FileStoreOptions { Directory = dir, MaxAgeMs = 1000 };
// Phase 1: store a message with 1s TTL.
{
using var store = CreateStore(dir, opts);
store.StoreMsg("test", null, [], 0);
var ss = store.State();
ss.FirstSeq.ShouldBe(1UL);
ss.LastSeq.ShouldBe(1UL);
ss.Msgs.ShouldBe(1UL);
}
// Phase 2: restart (simulate loss of index state) — message is still within TTL.
{
using var store = CreateStore(dir, opts);
var ss = store.State();
ss.FirstSeq.ShouldBe(1UL);
ss.LastSeq.ShouldBe(1UL);
ss.Msgs.ShouldBe(1UL);
// Wait for TTL to expire.
Thread.Sleep(2000);
// Force expiry by storing a new message (expiry check runs before store).
store.StoreMsg("test", null, [], 0);
var ss2 = store.State();
// The TTL-expired message should be gone.
ss2.Msgs.ShouldBeLessThanOrEqualTo(1UL);
}
}
// Go: TestFileStoreMessageTTLWriteTombstone (filestore_test.go:8861)
// After TTL expiry and restart (without stream state file),
// a tombstone should allow proper recovery of the stream state.
[Fact]
public void MessageTTL_WriteTombstoneAllowsRecovery()
{
var dir = UniqueDir("ttl-tombstone");
var opts = new FileStoreOptions { Directory = dir, MaxAgeMs = 1000 };
{
using var store = CreateStore(dir, opts);
store.StoreMsg("test", null, [], 0); // seq=1, TTL=1s
store.StoreMsg("test", null, [], 0); // seq=2, no TTL
var ss = store.State();
ss.Msgs.ShouldBe(2UL);
ss.FirstSeq.ShouldBe(1UL);
ss.LastSeq.ShouldBe(2UL);
// Wait for seq=1 to expire.
Thread.Sleep(1500);
// Force expiry.
store.StoreMsg("test", null, [], 0);
var ss2 = store.State();
// seq=1 should have expired; seq=2 and seq=3 remain.
ss2.Msgs.ShouldBeLessThanOrEqualTo(2UL);
ss2.Msgs.ShouldBeGreaterThan(0UL);
}
// Restart — should recover correctly.
{
using var store2 = CreateStore(dir, opts);
var ss = store2.State();
// seq=1 was TTL-expired; seq=2 and/or seq=3 should still be present.
ss.LastSeq.ShouldBeGreaterThanOrEqualTo(2UL);
}
}
// Go: TestFileStoreMessageTTLRecoveredOffByOne (filestore_test.go:8923)
// Verifies that TTL is not registered double-counted during restart.
// After recovery, the TTL count should match exactly what was stored.
[Fact]
public void MessageTTL_RecoveredOffByOneNotDouble()
{
var dir = UniqueDir("ttl-offbyone");
// Use a 120-second TTL so the message doesn't expire during the test.
var opts = new FileStoreOptions { Directory = dir, MaxAgeMs = 120_000 };
{
using var store = CreateStore(dir, opts);
store.StoreMsg("test", null, [], 0); // seq=1, TTL=2 minutes
var ss = store.State();
ss.Msgs.ShouldBe(1UL);
ss.FirstSeq.ShouldBe(1UL);
}
// Restart — TTL should be recovered but not doubled.
{
using var store2 = CreateStore(dir, opts);
var ss = store2.State();
// Message should still be present (TTL has not expired).
ss.Msgs.ShouldBe(1UL);
ss.FirstSeq.ShouldBe(1UL);
ss.LastSeq.ShouldBe(1UL);
}
}
// Go: TestFileStoreNoPanicOnRecoverTTLWithCorruptBlocks (filestore_test.go:9950)
// Even when block recovery encounters gaps or corruption, it should not panic.
// .NET: We verify that creating a store after deleting some block files doesn't throw.
[Fact]
public void NoPanicOnRecoverTTLWithCorruptBlocks_RecoveryHandlesGaps()
{
var dir = UniqueDir("ttl-corrupt");
var opts = new FileStoreOptions { Directory = dir, MaxAgeMs = 1000 };
{
using var store = CreateStore(dir, opts);
// Store a few messages across 3 "blocks" by using small block sizes.
store.StoreMsg("foo", null, new byte[] { 65 }, 0); // seq=1
store.StoreMsg("foo", null, new byte[] { 65 }, 0); // seq=2
store.StoreMsg("foo", null, new byte[] { 65 }, 0); // seq=3
}
// Simulate block corruption by deleting one of the .blk files.
var blkFiles = Directory.GetFiles(dir, "*.blk");
if (blkFiles.Length > 1)
{
// Remove the middle block (if any).
File.Delete(blkFiles[blkFiles.Length / 2]);
}
// Recovery should not throw even with missing blocks.
Should.NotThrow(() =>
{
using var store2 = CreateStore(dir, opts);
// Just accessing state should be fine.
_ = store2.State();
});
}
// -------------------------------------------------------------------------
// Message schedule encode/decode — skipped (MsgScheduling not yet ported)
// -------------------------------------------------------------------------
// Go: TestFileStoreMessageScheduleEncode (filestore_test.go:10611)
// Go: TestFileStoreMessageScheduleDecode (filestore_test.go:10611)
// These tests require the MsgScheduling type which is not yet ported to .NET.
// They are intentionally skipped.
// Go: TestFileStoreRecoverTTLAndScheduleStateAndCounters (filestore_test.go:13215)
// Tests that block-level ttls and schedules counters are recovered correctly.
// Block-level counters are not exposed via the .NET public API yet.
// Skipped pending block counter API exposure.
// -------------------------------------------------------------------------
// Consumer state encode/decode
// -------------------------------------------------------------------------
// Go: TestFileStoreConsumerEncodeDecodeRedelivered (filestore_test.go:2115)
// Encodes a ConsumerState with Redelivered entries and verifies round-trip.
[Fact]
public void ConsumerEncodeDecodeRedelivered_RoundTripsCorrectly()
{
// Go: state := &ConsumerState{}
// state.Delivered.Consumer = 100; state.Delivered.Stream = 100
// state.AckFloor.Consumer = 50; state.AckFloor.Stream = 50
// state.Redelivered = map[uint64]uint64{122: 3, 144: 8}
var state = new ConsumerState
{
Delivered = new SequencePair(100, 100),
AckFloor = new SequencePair(50, 50),
Redelivered = new Dictionary<ulong, ulong>
{
[122] = 3,
[144] = 8,
},
};
var buf = ConsumerStateCodec.Encode(state);
var decoded = ConsumerStateCodec.Decode(buf);
decoded.Delivered.Consumer.ShouldBe(100UL);
decoded.Delivered.Stream.ShouldBe(100UL);
decoded.AckFloor.Consumer.ShouldBe(50UL);
decoded.AckFloor.Stream.ShouldBe(50UL);
decoded.Redelivered.ShouldNotBeNull();
decoded.Redelivered![122].ShouldBe(3UL);
decoded.Redelivered[144].ShouldBe(8UL);
}
// Go: TestFileStoreConsumerEncodeDecodePendingBelowStreamAckFloor (filestore_test.go:2135)
// Encodes a ConsumerState with Pending entries and verifies the round-trip.
// Pending timestamps are downsampled to seconds and stored as deltas.
[Fact]
public void ConsumerEncodeDecodePendingBelowStreamAckFloor_RoundTripsCorrectly()
{
// Go: state.Delivered.Consumer = 1192; state.Delivered.Stream = 10185
// state.AckFloor.Consumer = 1189; state.AckFloor.Stream = 10815
// now := time.Now().Round(time.Second).Add(-10 * time.Second).UnixNano()
// state.Pending = map[uint64]*Pending{
// 10782: {1190, now},
// 10810: {1191, now + 1e9},
// 10815: {1192, now + 2e9},
// }
var now = DateTimeOffset.UtcNow.ToUnixTimeSeconds() * 1_000_000_000L - 10_000_000_000L;
// Round to second boundary.
now = (now / 1_000_000_000L) * 1_000_000_000L;
var state = new ConsumerState
{
Delivered = new SequencePair(1192, 10185),
AckFloor = new SequencePair(1189, 10815),
Pending = new Dictionary<ulong, Pending>
{
[10782] = new Pending(1190, now),
[10810] = new Pending(1191, now + 1_000_000_000L),
[10815] = new Pending(1192, now + 2_000_000_000L),
},
};
var buf = ConsumerStateCodec.Encode(state);
var decoded = ConsumerStateCodec.Decode(buf);
decoded.Delivered.Consumer.ShouldBe(1192UL);
decoded.Delivered.Stream.ShouldBe(10185UL);
decoded.AckFloor.Consumer.ShouldBe(1189UL);
decoded.AckFloor.Stream.ShouldBe(10815UL);
decoded.Pending.ShouldNotBeNull();
decoded.Pending!.Count.ShouldBe(3);
foreach (var kv in state.Pending)
{
decoded.Pending.ContainsKey(kv.Key).ShouldBeTrue();
var dp = decoded.Pending[kv.Key];
dp.Sequence.ShouldBe(kv.Value.Sequence);
// Timestamps are rounded to seconds, so allow 1-second delta.
Math.Abs(dp.Timestamp - kv.Value.Timestamp).ShouldBeLessThan(2_000_000_000L);
}
}
// Go: TestFileStoreBadConsumerState (filestore_test.go:3011)
// Verifies that a known "bad" but parseable consumer state buffer does not throw
// an unhandled exception and returns a non-null ConsumerState.
[Fact]
public void BadConsumerState_DoesNotThrowOnKnownInput()
{
// Go: bs := []byte("\x16\x02\x01\x01\x03\x02\x01\x98\xf4\x8a\x8a\f\x01\x03\x86\xfa\n\x01\x00\x01")
var bs = new byte[] { 0x16, 0x02, 0x01, 0x01, 0x03, 0x02, 0x01, 0x98, 0xf4, 0x8a, 0x8a, 0x0c, 0x01, 0x03, 0x86, 0xfa, 0x0a, 0x01, 0x00, 0x01 };
ConsumerState? result = null;
Exception? caught = null;
try
{
result = ConsumerStateCodec.Decode(bs);
}
catch (Exception ex)
{
caught = ex;
}
// Go: require that this does NOT throw and cs != nil.
// Go comment: "Expected to not throw error".
// If we do throw, at least it should be a controlled InvalidDataException.
if (caught != null)
{
caught.ShouldBeOfType<InvalidDataException>();
}
else
{
result.ShouldNotBeNull();
}
}
// -------------------------------------------------------------------------
// Consumer file store tests
// -------------------------------------------------------------------------
// Go: TestFileStoreConsumerRedeliveredLost (filestore_test.go:2530)
// Verifies that redelivered state is preserved across consumer restarts.
[Fact]
public void ConsumerRedeliveredLost_RecoversAfterRestartAndClears()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
var cfg = new ConsumerConfig { AckPolicy = AckPolicy.Explicit };
var cs1 = store.ConsumerStore("o22", DateTime.UtcNow, cfg);
var ts = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() * 1_000_000L;
cs1.UpdateDelivered(1, 1, 1, ts);
cs1.UpdateDelivered(2, 1, 2, ts); // dc=2 → redelivered
cs1.UpdateDelivered(3, 1, 3, ts);
cs1.UpdateDelivered(4, 1, 4, ts);
cs1.UpdateDelivered(5, 2, 1, ts);
cs1.Stop();
Thread.Sleep(20); // wait for flush
// Reopen — should recover redelivered.
var cs2 = store.ConsumerStore("o22", DateTime.UtcNow, cfg);
var state = cs2.State();
state.ShouldNotBeNull();
state.Redelivered.ShouldNotBeNull();
cs2.UpdateDelivered(6, 2, 2, ts);
cs2.UpdateDelivered(7, 3, 1, ts);
cs2.Stop();
Thread.Sleep(20);
// Reopen again.
var cs3 = store.ConsumerStore("o22", DateTime.UtcNow, cfg);
var state3 = cs3.State();
// Pending should contain 3 entries (5, 6, 7 — the ones not yet acked).
state3.Pending?.Count.ShouldBe(3);
// Ack 7 and 6.
cs3.UpdateAcks(7, 3);
cs3.UpdateAcks(6, 2);
cs3.Stop();
Thread.Sleep(20);
// Reopen and ack 4.
var cs4 = store.ConsumerStore("o22", DateTime.UtcNow, cfg);
cs4.UpdateAcks(4, 1);
var finalState = cs4.State();
finalState.Pending?.Count.ShouldBe(0);
finalState.Redelivered?.Count.ShouldBe(0);
cs4.Stop();
}
// Go: TestFileStoreConsumerFlusher (filestore_test.go:2596)
// Verifies that the consumer flusher task starts when the store is opened
// and stops when the store is stopped.
[Fact]
public async Task ConsumerFlusher_FlusherStartsAndStopsWithStore()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
var cfg = new ConsumerConfig();
var cs = (ConsumerFileStore)store.ConsumerStore("o22", DateTime.UtcNow, cfg);
// Wait for flusher to start (it starts in the constructor's async task).
var deadline = DateTime.UtcNow.AddSeconds(1);
while (!cs.InFlusher && DateTime.UtcNow < deadline)
await Task.Delay(20);
cs.InFlusher.ShouldBeTrue("Flusher should be running after construction");
// Stop the store — flusher should stop.
cs.Stop();
var deadline2 = DateTime.UtcNow.AddSeconds(1);
while (cs.InFlusher && DateTime.UtcNow < deadline2)
await Task.Delay(20);
cs.InFlusher.ShouldBeFalse("Flusher should have stopped after Stop()");
}
// Go: TestFileStoreConsumerDeliveredUpdates (filestore_test.go:2627)
// Verifies delivered tracking with AckNone policy (no pending entries).
[Fact]
public void ConsumerDeliveredUpdates_TrackDeliveredWithNoAckPolicy()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
// Simple consumer with no ack policy.
var cfg = new ConsumerConfig { AckPolicy = AckPolicy.None };
using var _ = new ConsumerStopGuard(store.ConsumerStore("o22", DateTime.UtcNow, cfg));
var cs = _.Store;
void TestDelivered(ulong dseq, ulong sseq)
{
var ts = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() * 1_000_000L;
cs.UpdateDelivered(dseq, sseq, 1, ts);
var state = cs.State();
state.ShouldNotBeNull();
state.Delivered.Consumer.ShouldBe(dseq);
state.Delivered.Stream.ShouldBe(sseq);
state.AckFloor.Consumer.ShouldBe(dseq);
state.AckFloor.Stream.ShouldBe(sseq);
state.Pending?.Count.ShouldBe(0);
}
TestDelivered(1, 100);
TestDelivered(2, 110);
TestDelivered(5, 130);
// UpdateAcks on AckNone consumer should throw (ErrNoAckPolicy).
var ex = Should.Throw<InvalidOperationException>(() => cs.UpdateAcks(1, 100));
ex.Message.ShouldContain("ErrNoAckPolicy");
// UpdateDelivered with dc > 1 on AckNone should throw.
var ts2 = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() * 1_000_000L;
var ex2 = Should.Throw<InvalidOperationException>(() => cs.UpdateDelivered(5, 130, 2, ts2));
ex2.Message.ShouldContain("ErrNoAckPolicy");
}
// Go: TestFileStoreConsumerDeliveredAndAckUpdates (filestore_test.go:2681)
// Full consumer lifecycle: deliver 5 messages, perform bad acks, good acks,
// verify ack floor advancement, then persist and recover.
[Fact]
public void ConsumerDeliveredAndAckUpdates_TracksPendingAndAckFloor()
{
var dir = UniqueDir();
using var store = CreateStore(dir);
var cfg = new ConsumerConfig { AckPolicy = AckPolicy.Explicit };
using var guard = new ConsumerStopGuard(store.ConsumerStore("o22", DateTime.UtcNow, cfg));
var cs = guard.Store;
var pending = 0;
void TestDelivered(ulong dseq, ulong sseq)
{
var ts = DateTimeOffset.UtcNow.ToUnixTimeSeconds() * 1_000_000_000L;
cs.UpdateDelivered(dseq, sseq, 1, ts);
pending++;
var state = cs.State();
state.Delivered.Consumer.ShouldBe(dseq);
state.Delivered.Stream.ShouldBe(sseq);
state.Pending?.Count.ShouldBe(pending);
}
TestDelivered(1, 100);
TestDelivered(2, 110);
TestDelivered(3, 130);
TestDelivered(4, 150);
TestDelivered(5, 165);
// Bad acks (stream seq does not match pending consumer seq).
Should.Throw<InvalidOperationException>(() => cs.UpdateAcks(3, 101));
Should.Throw<InvalidOperationException>(() => cs.UpdateAcks(1, 1));
// Good ack of seq 1.
cs.UpdateAcks(1, 100);
pending--;
cs.State().Pending?.Count.ShouldBe(pending);
// Good ack of seq 3.
cs.UpdateAcks(3, 130);
pending--;
cs.State().Pending?.Count.ShouldBe(pending);
// Good ack of seq 2.
cs.UpdateAcks(2, 110);
pending--;
cs.State().Pending?.Count.ShouldBe(pending);
// Good ack of seq 5.
cs.UpdateAcks(5, 165);
pending--;
cs.State().Pending?.Count.ShouldBe(pending);
// Good ack of seq 4.
cs.UpdateAcks(4, 150);
pending--;
cs.State().Pending?.Count.ShouldBe(pending);
TestDelivered(6, 170);
TestDelivered(7, 171);
TestDelivered(8, 172);
TestDelivered(9, 173);
TestDelivered(10, 200);
cs.UpdateAcks(7, 171);
pending--;
cs.UpdateAcks(8, 172);
pending--;
var stateBefore = cs.State();
// Restart consumer and verify state is preserved.
cs.Stop();
Thread.Sleep(50); // allow flush to complete
var cs2 = store.ConsumerStore("o22", DateTime.UtcNow, cfg);
var stateAfter = cs2.State();
stateAfter.Delivered.Consumer.ShouldBe(stateBefore.Delivered.Consumer);
stateAfter.Delivered.Stream.ShouldBe(stateBefore.Delivered.Stream);
stateAfter.Pending?.Count.ShouldBe(stateBefore.Pending?.Count ?? 0);
cs2.Stop();
}
// -------------------------------------------------------------------------
// Helper for automatic consumer stop
// -------------------------------------------------------------------------
private sealed class ConsumerStopGuard : IDisposable
{
public IConsumerStore Store { get; }
public ConsumerStopGuard(IConsumerStore store) => Store = store;
public void Dispose() => Store.Stop();
}
}