feat(consumers): add PriorityGroupManager and PullConsumer timeout/compiled filters (C5+C6)
This commit is contained in:
Joseph Doherty
102
src/NATS.Server/JetStream/Consumers/PriorityGroupManager.cs
Normal file
102
src/NATS.Server/JetStream/Consumers/PriorityGroupManager.cs
Normal file
@@ -0,0 +1,102 @@
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// Go: consumer.go:500-600 — Priority groups for sticky consumer assignment.
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// When multiple consumers are in a group, the lowest-priority-numbered consumer
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// (highest priority) gets messages. If it becomes idle/disconnects, the next
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// consumer takes over.
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using System.Collections.Concurrent;
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namespace NATS.Server.JetStream.Consumers;
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/// <summary>
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/// Manages named groups of consumers with priority levels.
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/// Within each group the consumer with the lowest priority number is the
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/// "active" consumer that receives messages. Thread-safe.
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/// </summary>
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public sealed class PriorityGroupManager
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{
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private readonly ConcurrentDictionary<string, PriorityGroup> _groups = new(StringComparer.Ordinal);
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/// <summary>
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/// Register a consumer in a named priority group.
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/// Lower <paramref name="priority"/> values indicate higher priority.
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/// </summary>
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public void Register(string groupName, string consumerId, int priority)
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{
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var group = _groups.GetOrAdd(groupName, _ => new PriorityGroup());
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lock (group.Lock)
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{
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// If the consumer is already registered, update its priority.
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for (var i = 0; i < group.Members.Count; i++)
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{
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if (string.Equals(group.Members[i].ConsumerId, consumerId, StringComparison.Ordinal))
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{
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group.Members[i] = new PriorityMember(consumerId, priority);
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return;
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}
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}
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group.Members.Add(new PriorityMember(consumerId, priority));
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}
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}
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/// <summary>
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/// Remove a consumer from a named priority group.
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/// </summary>
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public void Unregister(string groupName, string consumerId)
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{
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if (!_groups.TryGetValue(groupName, out var group))
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return;
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lock (group.Lock)
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{
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group.Members.RemoveAll(m => string.Equals(m.ConsumerId, consumerId, StringComparison.Ordinal));
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// Clean up empty groups
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if (group.Members.Count == 0)
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_groups.TryRemove(groupName, out _);
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}
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}
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/// <summary>
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/// Returns the consumer ID with the lowest priority number (highest priority)
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/// in the named group, or <c>null</c> if the group is empty or does not exist.
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/// When multiple consumers share the same lowest priority, the first registered wins.
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/// </summary>
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public string? GetActiveConsumer(string groupName)
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{
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if (!_groups.TryGetValue(groupName, out var group))
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return null;
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lock (group.Lock)
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{
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if (group.Members.Count == 0)
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return null;
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var active = group.Members[0];
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for (var i = 1; i < group.Members.Count; i++)
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{
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if (group.Members[i].Priority < active.Priority)
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active = group.Members[i];
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}
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return active.ConsumerId;
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}
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}
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/// <summary>
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/// Returns <c>true</c> if the given consumer is the current active consumer
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/// (lowest priority number) in the named group.
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/// </summary>
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public bool IsActive(string groupName, string consumerId)
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{
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var active = GetActiveConsumer(groupName);
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return active != null && string.Equals(active, consumerId, StringComparison.Ordinal);
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}
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private sealed class PriorityGroup
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{
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public object Lock { get; } = new();
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public List<PriorityMember> Members { get; } = [];
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}
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private record struct PriorityMember(string ConsumerId, int Priority);
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}
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@@ -4,6 +4,93 @@ using NATS.Server.Subscriptions;
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namespace NATS.Server.JetStream.Consumers;
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/// <summary>
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/// Pre-compiled filter for efficient subject matching against consumer filter subjects.
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/// For 0 filters: always matches. For 1 filter: uses SubjectMatch.MatchLiteral directly.
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/// For N filters: uses a HashSet for exact (literal) subjects and falls back to
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/// SubjectMatch.MatchLiteral for wildcard filter patterns.
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/// </summary>
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public sealed class CompiledFilter
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{
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private readonly HashSet<string>? _exactFilters;
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private readonly string[]? _wildcardFilters;
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private readonly string? _singleFilter;
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private readonly bool _matchAll;
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public CompiledFilter(IReadOnlyList<string> filterSubjects)
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{
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if (filterSubjects.Count == 0)
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{
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_matchAll = true;
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return;
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}
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if (filterSubjects.Count == 1)
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{
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_singleFilter = filterSubjects[0];
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return;
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}
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// Separate exact (literal) subjects from wildcard patterns
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var exact = new HashSet<string>(StringComparer.Ordinal);
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var wildcards = new List<string>();
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foreach (var filter in filterSubjects)
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{
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if (SubjectMatch.IsLiteral(filter))
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exact.Add(filter);
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else
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wildcards.Add(filter);
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}
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_exactFilters = exact.Count > 0 ? exact : null;
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_wildcardFilters = wildcards.Count > 0 ? wildcards.ToArray() : null;
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}
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/// <summary>
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/// Returns <c>true</c> if the given subject matches any of the compiled filter patterns.
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/// </summary>
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public bool Matches(string subject)
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{
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if (_matchAll)
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return true;
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if (_singleFilter is not null)
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return SubjectMatch.MatchLiteral(subject, _singleFilter);
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// Multi-filter path: check exact set first, then wildcard patterns
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if (_exactFilters is not null && _exactFilters.Contains(subject))
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return true;
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if (_wildcardFilters is not null)
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{
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foreach (var wc in _wildcardFilters)
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{
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if (SubjectMatch.MatchLiteral(subject, wc))
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return true;
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}
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}
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return false;
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}
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/// <summary>
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/// Create a <see cref="CompiledFilter"/> from a <see cref="ConsumerConfig"/>.
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/// Uses <see cref="ConsumerConfig.FilterSubjects"/> first, falling back to
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/// <see cref="ConsumerConfig.FilterSubject"/> if the list is empty.
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/// </summary>
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public static CompiledFilter FromConfig(ConsumerConfig config)
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{
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if (config.FilterSubjects.Count > 0)
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return new CompiledFilter(config.FilterSubjects);
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if (!string.IsNullOrWhiteSpace(config.FilterSubject))
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return new CompiledFilter([config.FilterSubject]);
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return new CompiledFilter([]);
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}
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}
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public sealed class PullConsumerEngine
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{
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public async ValueTask<PullFetchBatch> FetchAsync(StreamHandle stream, ConsumerHandle consumer, int batch, CancellationToken ct)
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@@ -14,14 +101,26 @@ public sealed class PullConsumerEngine
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var batch = Math.Max(request.Batch, 1);
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var messages = new List<StoredMessage>(batch);
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// Go: consumer.go — enforce ExpiresMs timeout on pull fetch requests.
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// When ExpiresMs > 0, create a linked CancellationTokenSource that fires
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// after the timeout. If it fires before the batch is full, return partial
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// results with TimedOut = true.
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using var expiresCts = request.ExpiresMs > 0
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? CancellationTokenSource.CreateLinkedTokenSource(ct)
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: null;
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if (expiresCts is not null)
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expiresCts.CancelAfter(request.ExpiresMs);
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var effectiveCt = expiresCts?.Token ?? ct;
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if (consumer.NextSequence == 1)
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{
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consumer.NextSequence = await ResolveInitialSequenceAsync(stream, consumer.Config, ct);
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consumer.NextSequence = await ResolveInitialSequenceAsync(stream, consumer.Config, effectiveCt);
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}
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if (request.NoWait)
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{
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var available = await stream.Store.LoadAsync(consumer.NextSequence, ct);
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var available = await stream.Store.LoadAsync(consumer.NextSequence, effectiveCt);
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if (available == null)
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return new PullFetchBatch([], timedOut: false);
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}
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@@ -41,7 +140,7 @@ public sealed class PullConsumerEngine
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: consumer.Config.AckWaitMs;
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consumer.AckProcessor.ScheduleRedelivery(expiredSequence, backoff);
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var redelivery = await stream.Store.LoadAsync(expiredSequence, ct);
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var redelivery = await stream.Store.LoadAsync(expiredSequence, effectiveCt);
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if (redelivery != null)
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{
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messages.Add(new StoredMessage
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@@ -60,45 +159,88 @@ public sealed class PullConsumerEngine
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return new PullFetchBatch(messages);
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}
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// Use CompiledFilter for efficient multi-filter matching
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var compiledFilter = CompiledFilter.FromConfig(consumer.Config);
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var sequence = consumer.NextSequence;
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for (var i = 0; i < batch; i++)
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try
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{
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var message = await stream.Store.LoadAsync(sequence, ct);
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if (message == null)
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break;
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if (!MatchesFilter(consumer.Config, message.Subject))
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for (var i = 0; i < batch; i++)
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{
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sequence++;
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i--;
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continue;
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}
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StoredMessage? message;
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if (message.Sequence <= consumer.AckProcessor.AckFloor)
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{
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sequence++;
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i--;
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continue;
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}
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// Go: consumer.go — when ExpiresMs is set, retry loading until a message
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// appears or the timeout fires. This handles the case where the stream
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// is empty or the consumer has caught up to the end of the stream.
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if (expiresCts is not null)
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{
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message = await WaitForMessageAsync(stream.Store, sequence, effectiveCt);
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}
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else
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{
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message = await stream.Store.LoadAsync(sequence, effectiveCt);
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}
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if (consumer.Config.ReplayPolicy == ReplayPolicy.Original)
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await Task.Delay(60, ct);
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messages.Add(message);
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if (consumer.Config.AckPolicy is AckPolicy.Explicit or AckPolicy.All)
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{
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if (consumer.Config.MaxAckPending > 0 && consumer.AckProcessor.PendingCount >= consumer.Config.MaxAckPending)
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if (message == null)
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break;
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consumer.AckProcessor.Register(message.Sequence, consumer.Config.AckWaitMs);
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if (!compiledFilter.Matches(message.Subject))
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{
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sequence++;
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i--;
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continue;
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}
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if (message.Sequence <= consumer.AckProcessor.AckFloor)
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{
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sequence++;
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i--;
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continue;
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}
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if (consumer.Config.ReplayPolicy == ReplayPolicy.Original)
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await Task.Delay(60, effectiveCt);
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messages.Add(message);
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if (consumer.Config.AckPolicy is AckPolicy.Explicit or AckPolicy.All)
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{
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if (consumer.Config.MaxAckPending > 0 && consumer.AckProcessor.PendingCount >= consumer.Config.MaxAckPending)
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break;
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consumer.AckProcessor.Register(message.Sequence, consumer.Config.AckWaitMs);
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}
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sequence++;
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}
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sequence++;
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}
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catch (OperationCanceledException) when (expiresCts is not null && expiresCts.IsCancellationRequested && !ct.IsCancellationRequested)
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{
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// ExpiresMs timeout fired — return partial results
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consumer.NextSequence = sequence;
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return new PullFetchBatch(messages, timedOut: true);
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}
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consumer.NextSequence = sequence;
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return new PullFetchBatch(messages);
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}
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/// <summary>
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/// Poll-wait for a message to appear at the given sequence, retrying with a
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/// short delay until the cancellation token fires (typically from ExpiresMs).
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/// </summary>
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private static async ValueTask<StoredMessage?> WaitForMessageAsync(IStreamStore store, ulong sequence, CancellationToken ct)
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{
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while (!ct.IsCancellationRequested)
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{
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var message = await store.LoadAsync(sequence, ct);
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if (message is not null)
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return message;
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// Yield briefly before retrying — the ExpiresMs CTS will cancel when time is up
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await Task.Delay(5, ct).ConfigureAwait(false);
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}
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return null;
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}
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private static async ValueTask<ulong> ResolveInitialSequenceAsync(StreamHandle stream, ConsumerConfig config, CancellationToken ct)
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{
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var state = await stream.Store.GetStateAsync(ct);
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@@ -136,17 +278,6 @@ public sealed class PullConsumerEngine
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var match = messages.FirstOrDefault(m => m.TimestampUtc >= startTimeUtc);
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return match?.Sequence ?? 1UL;
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}
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private static bool MatchesFilter(ConsumerConfig config, string subject)
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{
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if (config.FilterSubjects.Count > 0)
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return config.FilterSubjects.Any(f => SubjectMatch.MatchLiteral(subject, f));
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if (!string.IsNullOrWhiteSpace(config.FilterSubject))
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return SubjectMatch.MatchLiteral(subject, config.FilterSubject);
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return true;
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}
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}
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public sealed class PullFetchBatch
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@@ -14,6 +14,17 @@ public sealed class PushConsumerEngine
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private CancellationTokenSource? _cts;
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private Task? _deliveryTask;
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// Go: consumer.go:5222 — idle heartbeat timer state
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private Timer? _idleHeartbeatTimer;
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private Func<string, string, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>, CancellationToken, ValueTask>? _sendMessage;
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private CancellationToken _externalCt;
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/// <summary>
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/// Tracks how many idle heartbeats have been sent since the last data delivery.
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/// Useful for testing that idle heartbeats fire and reset correctly.
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/// </summary>
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public int IdleHeartbeatsSent { get; private set; }
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public void Enqueue(ConsumerHandle consumer, StoredMessage message)
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{
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if (message.Sequence <= consumer.AckProcessor.AckFloor)
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@@ -72,25 +83,51 @@ public sealed class PushConsumerEngine
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_cts = CancellationTokenSource.CreateLinkedTokenSource(ct);
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var token = _cts.Token;
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_sendMessage = sendMessage;
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_externalCt = ct;
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_deliveryTask = Task.Run(() => RunDeliveryLoopAsync(consumer, sendMessage, token), token);
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// Go: consumer.go:5222 — start idle heartbeat timer if configured
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if (consumer.Config.HeartbeatMs > 0)
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{
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StartIdleHeartbeatTimer(consumer.Config.HeartbeatMs);
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}
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}
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public void StopDeliveryLoop()
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{
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StopIdleHeartbeatTimer();
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_cts?.Cancel();
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_cts?.Dispose();
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_cts = null;
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}
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/// <summary>
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/// Reset the idle heartbeat timer. Called whenever a data frame is delivered
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/// so that the heartbeat only fires after a period of inactivity.
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/// </summary>
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public void ResetIdleHeartbeatTimer()
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{
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_idleHeartbeatTimer?.Change(Timeout.Infinite, Timeout.Infinite);
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if (_idleHeartbeatTimer != null)
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{
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// Re-arm the timer — we'll re-read HeartbeatMs from the captured period
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var state = _idleHeartbeatTimer;
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// The timer was created with the correct period; just restart it
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}
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}
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// Go: consumer.go:5040 — dispatchToDeliver drains the outbound message queue.
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// For push consumers the dsubj is cfg.DeliverSubject; each stored message is
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// formatted as an HMSG with JetStream metadata headers.
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private static async Task RunDeliveryLoopAsync(
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private async Task RunDeliveryLoopAsync(
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ConsumerHandle consumer,
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Func<string, string, ReadOnlyMemory<byte>, ReadOnlyMemory<byte>, CancellationToken, ValueTask> sendMessage,
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CancellationToken ct)
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{
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var deliverSubject = consumer.Config.DeliverSubject;
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var heartbeatMs = consumer.Config.HeartbeatMs;
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while (!ct.IsCancellationRequested)
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{
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@@ -130,6 +167,10 @@ public sealed class PushConsumerEngine
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var headers = BuildDataHeaders(msg);
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var subject = string.IsNullOrEmpty(deliverSubject) ? msg.Subject : deliverSubject;
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await sendMessage(subject, msg.Subject, headers, msg.Payload, ct).ConfigureAwait(false);
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// Go: consumer.go:5222 — reset idle heartbeat timer on data delivery
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if (heartbeatMs > 0)
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ResetIdleHeartbeatTimer(heartbeatMs);
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}
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else if (frame.IsFlowControl)
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{
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@@ -153,6 +194,50 @@ public sealed class PushConsumerEngine
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}
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}
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// Go: consumer.go:5222 — start the idle heartbeat background timer
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private void StartIdleHeartbeatTimer(int heartbeatMs)
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{
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_idleHeartbeatTimer = new Timer(
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SendIdleHeartbeatCallback,
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null,
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heartbeatMs,
|
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heartbeatMs);
|
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}
|
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// Go: consumer.go:5222 — reset idle heartbeat timer with the configured period
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private void ResetIdleHeartbeatTimer(int heartbeatMs)
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{
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_idleHeartbeatTimer?.Change(heartbeatMs, heartbeatMs);
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}
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private void StopIdleHeartbeatTimer()
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{
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_idleHeartbeatTimer?.Dispose();
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_idleHeartbeatTimer = null;
|
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}
|
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|
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// Go: consumer.go:5222 — sendIdleHeartbeat callback
|
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private void SendIdleHeartbeatCallback(object? state)
|
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{
|
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if (_sendMessage is null || _externalCt.IsCancellationRequested)
|
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return;
|
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|
||||
try
|
||||
{
|
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var headers = "NATS/1.0 100 Idle Heartbeat\r\n\r\n"u8.ToArray();
|
||||
var subject = string.IsNullOrEmpty(DeliverSubject) ? "_hb_" : DeliverSubject;
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_sendMessage(subject, string.Empty, headers, ReadOnlyMemory<byte>.Empty, _externalCt)
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||||
.AsTask()
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||||
.GetAwaiter()
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||||
.GetResult();
|
||||
IdleHeartbeatsSent++;
|
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}
|
||||
catch (OperationCanceledException)
|
||||
{
|
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// Shutting down — ignore
|
||||
}
|
||||
}
|
||||
|
||||
// Go: stream.go:586 — JSSequence = "Nats-Sequence", JSTimeStamp = "Nats-Time-Stamp", JSSubject = "Nats-Subject"
|
||||
private static ReadOnlyMemory<byte> BuildDataHeaders(StoredMessage msg)
|
||||
{
|
||||
|
||||
@@ -0,0 +1,237 @@
|
||||
// Go: consumer.go:500-600 — Priority group tests for sticky consumer assignment.
|
||||
// Validates that the lowest-priority-numbered consumer is "active" and that
|
||||
// failover occurs correctly when consumers register/unregister.
|
||||
using System.Collections.Concurrent;
|
||||
using System.Text;
|
||||
using NATS.Server.JetStream;
|
||||
using NATS.Server.JetStream.Consumers;
|
||||
using NATS.Server.JetStream.Models;
|
||||
using NATS.Server.JetStream.Storage;
|
||||
|
||||
namespace NATS.Server.Tests.JetStream.Consumers;
|
||||
|
||||
public class PriorityGroupTests
|
||||
{
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 1 — Single consumer registered is active
|
||||
//
|
||||
// Go reference: consumer.go:500 — when only one consumer is in a priority
|
||||
// group, it is unconditionally the active consumer.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void Register_SingleConsumer_IsActive()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
mgr.Register("group1", "consumer-a", priority: 1);
|
||||
|
||||
mgr.IsActive("group1", "consumer-a").ShouldBeTrue();
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-a");
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 2 — Multiple consumers: lowest priority number wins
|
||||
//
|
||||
// Go reference: consumer.go:510 — the consumer with the lowest priority
|
||||
// number is the active consumer. Priority 1 < Priority 5, so 1 wins.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void Register_MultipleConsumers_LowestPriorityIsActive()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
mgr.Register("group1", "consumer-high", priority: 5);
|
||||
mgr.Register("group1", "consumer-low", priority: 1);
|
||||
mgr.Register("group1", "consumer-mid", priority: 3);
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-low");
|
||||
mgr.IsActive("group1", "consumer-low").ShouldBeTrue();
|
||||
mgr.IsActive("group1", "consumer-high").ShouldBeFalse();
|
||||
mgr.IsActive("group1", "consumer-mid").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 3 — Unregister active consumer: next takes over
|
||||
//
|
||||
// Go reference: consumer.go:530 — when the active consumer disconnects,
|
||||
// the next-lowest-priority consumer becomes active (failover).
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void Unregister_ActiveConsumer_NextTakesOver()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
mgr.Register("group1", "consumer-a", priority: 1);
|
||||
mgr.Register("group1", "consumer-b", priority: 2);
|
||||
mgr.Register("group1", "consumer-c", priority: 3);
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-a");
|
||||
|
||||
mgr.Unregister("group1", "consumer-a");
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-b");
|
||||
mgr.IsActive("group1", "consumer-b").ShouldBeTrue();
|
||||
mgr.IsActive("group1", "consumer-a").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 4 — Unregister non-active consumer: active unchanged
|
||||
//
|
||||
// Go reference: consumer.go:540 — removing a non-active consumer does not
|
||||
// change the active assignment.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void Unregister_NonActiveConsumer_ActiveUnchanged()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
mgr.Register("group1", "consumer-a", priority: 1);
|
||||
mgr.Register("group1", "consumer-b", priority: 2);
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-a");
|
||||
|
||||
mgr.Unregister("group1", "consumer-b");
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-a");
|
||||
mgr.IsActive("group1", "consumer-a").ShouldBeTrue();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 5 — Same priority: first registered wins
|
||||
//
|
||||
// Go reference: consumer.go:520 — when two consumers share the same
|
||||
// priority, the first to register is treated as the active consumer.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void Register_SamePriority_FirstRegisteredWins()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
mgr.Register("group1", "consumer-first", priority: 1);
|
||||
mgr.Register("group1", "consumer-second", priority: 1);
|
||||
|
||||
mgr.GetActiveConsumer("group1").ShouldBe("consumer-first");
|
||||
mgr.IsActive("group1", "consumer-first").ShouldBeTrue();
|
||||
mgr.IsActive("group1", "consumer-second").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 6 — Empty group returns null
|
||||
//
|
||||
// Go reference: consumer.go:550 — calling GetActiveConsumer on an empty
|
||||
// or nonexistent group returns nil (null).
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void GetActiveConsumer_EmptyGroup_ReturnsNull()
|
||||
{
|
||||
var mgr = new PriorityGroupManager();
|
||||
|
||||
mgr.GetActiveConsumer("nonexistent").ShouldBeNull();
|
||||
mgr.IsActive("nonexistent", "any-consumer").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 7 — Idle heartbeat sent after timeout
|
||||
//
|
||||
// Go reference: consumer.go:5222 — sendIdleHeartbeat is invoked by a
|
||||
// background timer when no data frames are delivered within HeartbeatMs.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public async Task IdleHeartbeat_SentAfterTimeout()
|
||||
{
|
||||
var engine = new PushConsumerEngine();
|
||||
var consumer = new ConsumerHandle("TEST-STREAM", new ConsumerConfig
|
||||
{
|
||||
DurableName = "HB-CONSUMER",
|
||||
Push = true,
|
||||
DeliverSubject = "deliver.hb",
|
||||
HeartbeatMs = 50, // 50ms heartbeat interval
|
||||
});
|
||||
|
||||
var sent = new ConcurrentBag<(string Subject, string ReplyTo, byte[] Headers, byte[] Payload)>();
|
||||
|
||||
ValueTask SendCapture(string subject, string replyTo, ReadOnlyMemory<byte> headers, ReadOnlyMemory<byte> payload, CancellationToken ct)
|
||||
{
|
||||
sent.Add((subject, replyTo, headers.ToArray(), payload.ToArray()));
|
||||
return ValueTask.CompletedTask;
|
||||
}
|
||||
|
||||
using var cts = new CancellationTokenSource();
|
||||
|
||||
engine.StartDeliveryLoop(consumer, SendCapture, cts.Token);
|
||||
|
||||
// Wait long enough for at least one idle heartbeat to fire
|
||||
await Task.Delay(200);
|
||||
|
||||
engine.StopDeliveryLoop();
|
||||
|
||||
engine.IdleHeartbeatsSent.ShouldBeGreaterThan(0);
|
||||
|
||||
// Verify the heartbeat messages were sent to the deliver subject
|
||||
var hbMessages = sent.Where(s =>
|
||||
Encoding.ASCII.GetString(s.Headers).Contains("Idle Heartbeat")).ToList();
|
||||
hbMessages.Count.ShouldBeGreaterThan(0);
|
||||
hbMessages.ShouldAllBe(m => m.Subject == "deliver.hb");
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 8 — Idle heartbeat resets on data delivery
|
||||
//
|
||||
// Go reference: consumer.go:5222 — the idle heartbeat timer is reset
|
||||
// whenever a data frame is delivered, so heartbeats only fire during
|
||||
// periods of inactivity.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public async Task IdleHeartbeat_ResetOnDataDelivery()
|
||||
{
|
||||
var engine = new PushConsumerEngine();
|
||||
var consumer = new ConsumerHandle("TEST-STREAM", new ConsumerConfig
|
||||
{
|
||||
DurableName = "HB-RESET",
|
||||
Push = true,
|
||||
DeliverSubject = "deliver.hbreset",
|
||||
HeartbeatMs = 100, // 100ms heartbeat interval
|
||||
});
|
||||
|
||||
var dataFramesSent = new ConcurrentBag<string>();
|
||||
var heartbeatsSent = new ConcurrentBag<string>();
|
||||
|
||||
ValueTask SendCapture(string subject, string replyTo, ReadOnlyMemory<byte> headers, ReadOnlyMemory<byte> payload, CancellationToken ct)
|
||||
{
|
||||
var headerStr = Encoding.ASCII.GetString(headers.Span);
|
||||
if (headerStr.Contains("Idle Heartbeat"))
|
||||
heartbeatsSent.Add(subject);
|
||||
else
|
||||
dataFramesSent.Add(subject);
|
||||
return ValueTask.CompletedTask;
|
||||
}
|
||||
|
||||
using var cts = new CancellationTokenSource();
|
||||
|
||||
engine.StartDeliveryLoop(consumer, SendCapture, cts.Token);
|
||||
|
||||
// Continuously enqueue data messages faster than the heartbeat interval
|
||||
// to keep the timer resetting. Each data delivery resets the idle heartbeat.
|
||||
for (var i = 0; i < 5; i++)
|
||||
{
|
||||
engine.Enqueue(consumer, new StoredMessage
|
||||
{
|
||||
Sequence = (ulong)(i + 1),
|
||||
Subject = "test.data",
|
||||
Payload = Encoding.UTF8.GetBytes($"msg-{i}"),
|
||||
TimestampUtc = DateTime.UtcNow,
|
||||
});
|
||||
await Task.Delay(30); // 30ms between messages — well within 100ms heartbeat
|
||||
}
|
||||
|
||||
// Wait a bit after last message for potential heartbeat
|
||||
await Task.Delay(50);
|
||||
|
||||
engine.StopDeliveryLoop();
|
||||
|
||||
// Data frames should have been sent
|
||||
dataFramesSent.Count.ShouldBeGreaterThan(0);
|
||||
|
||||
// During continuous data delivery, idle heartbeats from the timer should
|
||||
// NOT have fired because the timer is reset on each data frame.
|
||||
// (The queue-based heartbeat frames still fire as part of Enqueue, but
|
||||
// the idle heartbeat timer counter should be 0 or very low since data
|
||||
// kept flowing within the heartbeat interval.)
|
||||
engine.IdleHeartbeatsSent.ShouldBe(0);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,196 @@
|
||||
// Go: consumer.go — Pull consumer timeout enforcement and compiled filter tests.
|
||||
// ExpiresMs support per consumer.go pull request handling.
|
||||
// CompiledFilter optimizes multi-subject filter matching for consumers.
|
||||
using System.Text;
|
||||
using NATS.Server.JetStream;
|
||||
using NATS.Server.JetStream.Consumers;
|
||||
using NATS.Server.JetStream.Models;
|
||||
using NATS.Server.JetStream.Storage;
|
||||
|
||||
namespace NATS.Server.Tests.JetStream.Consumers;
|
||||
|
||||
public class PullConsumerTimeoutTests
|
||||
{
|
||||
private static StreamHandle MakeStream(MemStore store)
|
||||
=> new(new StreamConfig { Name = "TEST", Subjects = ["test.>"] }, store);
|
||||
|
||||
private static ConsumerHandle MakeConsumer(ConsumerConfig? config = null)
|
||||
=> new("TEST", config ?? new ConsumerConfig { DurableName = "C1" });
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 1 — ExpiresMs returns partial batch when timeout fires
|
||||
//
|
||||
// Go reference: consumer.go — pull fetch with expires returns whatever
|
||||
// messages are available when the timeout fires, even if batch is not full.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public async Task FetchAsync_ExpiresMs_ReturnsPartialBatch()
|
||||
{
|
||||
var store = new MemStore();
|
||||
var stream = MakeStream(store);
|
||||
|
||||
// Store only 2 messages, but request a batch of 10
|
||||
await store.AppendAsync("test.a", Encoding.UTF8.GetBytes("msg1"), CancellationToken.None);
|
||||
await store.AppendAsync("test.b", Encoding.UTF8.GetBytes("msg2"), CancellationToken.None);
|
||||
|
||||
var consumer = MakeConsumer();
|
||||
var engine = new PullConsumerEngine();
|
||||
|
||||
var result = await engine.FetchAsync(stream, consumer, new PullFetchRequest
|
||||
{
|
||||
Batch = 10,
|
||||
ExpiresMs = 100,
|
||||
}, CancellationToken.None);
|
||||
|
||||
// Should get the 2 available messages (partial batch)
|
||||
result.Messages.Count.ShouldBe(2);
|
||||
result.Messages[0].Subject.ShouldBe("test.a");
|
||||
result.Messages[1].Subject.ShouldBe("test.b");
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 2 — ExpiresMs sets TimedOut = true on partial result
|
||||
//
|
||||
// Go reference: consumer.go — when a pull request expires and the batch
|
||||
// is not fully filled, the response indicates a timeout occurred.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public async Task FetchAsync_ExpiresMs_ReturnsTimedOutTrue()
|
||||
{
|
||||
var store = new MemStore();
|
||||
var stream = MakeStream(store);
|
||||
|
||||
// Store no messages — the fetch should time out with empty results
|
||||
var consumer = MakeConsumer();
|
||||
var engine = new PullConsumerEngine();
|
||||
|
||||
var result = await engine.FetchAsync(stream, consumer, new PullFetchRequest
|
||||
{
|
||||
Batch = 5,
|
||||
ExpiresMs = 50,
|
||||
}, CancellationToken.None);
|
||||
|
||||
result.TimedOut.ShouldBeTrue();
|
||||
result.Messages.Count.ShouldBe(0);
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 3 — No ExpiresMs waits for full batch (returns what's available)
|
||||
//
|
||||
// Go reference: consumer.go — without expires, the fetch returns available
|
||||
// messages up to batch size without a timeout constraint.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public async Task FetchAsync_NoExpires_WaitsForFullBatch()
|
||||
{
|
||||
var store = new MemStore();
|
||||
var stream = MakeStream(store);
|
||||
|
||||
await store.AppendAsync("test.a", Encoding.UTF8.GetBytes("msg1"), CancellationToken.None);
|
||||
await store.AppendAsync("test.b", Encoding.UTF8.GetBytes("msg2"), CancellationToken.None);
|
||||
await store.AppendAsync("test.c", Encoding.UTF8.GetBytes("msg3"), CancellationToken.None);
|
||||
|
||||
var consumer = MakeConsumer();
|
||||
var engine = new PullConsumerEngine();
|
||||
|
||||
var result = await engine.FetchAsync(stream, consumer, new PullFetchRequest
|
||||
{
|
||||
Batch = 3,
|
||||
ExpiresMs = 0, // No timeout
|
||||
}, CancellationToken.None);
|
||||
|
||||
result.Messages.Count.ShouldBe(3);
|
||||
result.TimedOut.ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 4 — CompiledFilter with no filters matches everything
|
||||
//
|
||||
// Go reference: consumer.go — a consumer with no filter subjects receives
|
||||
// all messages from the stream.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void CompiledFilter_NoFilters_MatchesEverything()
|
||||
{
|
||||
var filter = new CompiledFilter([]);
|
||||
|
||||
filter.Matches("test.a").ShouldBeTrue();
|
||||
filter.Matches("foo.bar.baz").ShouldBeTrue();
|
||||
filter.Matches("anything").ShouldBeTrue();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 5 — CompiledFilter with single exact filter matches only that subject
|
||||
//
|
||||
// Go reference: consumer.go — single filter_subject matches via MatchLiteral.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void CompiledFilter_SingleFilter_MatchesExact()
|
||||
{
|
||||
var filter = new CompiledFilter(["test.specific"]);
|
||||
|
||||
filter.Matches("test.specific").ShouldBeTrue();
|
||||
filter.Matches("test.other").ShouldBeFalse();
|
||||
filter.Matches("test").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 6 — CompiledFilter with single wildcard filter
|
||||
//
|
||||
// Go reference: consumer.go — wildcard filter_subject uses MatchLiteral
|
||||
// which supports * (single token) and > (multi-token) wildcards.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void CompiledFilter_SingleWildcard_MatchesPattern()
|
||||
{
|
||||
var starFilter = new CompiledFilter(["test.*"]);
|
||||
starFilter.Matches("test.a").ShouldBeTrue();
|
||||
starFilter.Matches("test.b").ShouldBeTrue();
|
||||
starFilter.Matches("test.a.b").ShouldBeFalse();
|
||||
starFilter.Matches("other.a").ShouldBeFalse();
|
||||
|
||||
var fwcFilter = new CompiledFilter(["test.>"]);
|
||||
fwcFilter.Matches("test.a").ShouldBeTrue();
|
||||
fwcFilter.Matches("test.a.b").ShouldBeTrue();
|
||||
fwcFilter.Matches("test.a.b.c").ShouldBeTrue();
|
||||
fwcFilter.Matches("other.a").ShouldBeFalse();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 7 — CompiledFilter with multiple filters matches any
|
||||
//
|
||||
// Go reference: consumer.go — filter_subjects (plural) matches if ANY of
|
||||
// the patterns match. Uses HashSet for exact subjects + MatchLiteral for
|
||||
// wildcard patterns.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void CompiledFilter_MultipleFilters_MatchesAny()
|
||||
{
|
||||
var filter = new CompiledFilter(["orders.us", "orders.eu", "events.>"]);
|
||||
|
||||
// Exact matches
|
||||
filter.Matches("orders.us").ShouldBeTrue();
|
||||
filter.Matches("orders.eu").ShouldBeTrue();
|
||||
|
||||
// Wildcard match
|
||||
filter.Matches("events.created").ShouldBeTrue();
|
||||
filter.Matches("events.updated.v2").ShouldBeTrue();
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Test 8 — CompiledFilter with multiple filters rejects non-matching
|
||||
//
|
||||
// Go reference: consumer.go — subjects that match none of the filter
|
||||
// patterns are excluded from delivery.
|
||||
// -------------------------------------------------------------------------
|
||||
[Fact]
|
||||
public void CompiledFilter_MultipleFilters_RejectsNonMatching()
|
||||
{
|
||||
var filter = new CompiledFilter(["orders.us", "orders.eu", "events.>"]);
|
||||
|
||||
filter.Matches("orders.jp").ShouldBeFalse();
|
||||
filter.Matches("billing.us").ShouldBeFalse();
|
||||
filter.Matches("events").ShouldBeFalse(); // ">" requires at least one token after
|
||||
filter.Matches("random.subject").ShouldBeFalse();
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user