900e148d8a
DirectoryMessagePackBackingStore loses HydrationFilter, FlushStageProbe,
ReadStageProbe and their stage constants, ReadPersistedGeneration,
PullSelected, and every legacy path: the v2 directory-indexed and v3
immutable-pages formats, v1 inline records and split pages, the index
upgrade on flush, and the legacy page paths. CacheBackingStore.PullSelected
and CultPersistedRecordMetadata go with them.
A missing manifest is an empty store. An existing manifest whose
FormatVersion is not cultcache.store.v4.directory-content-addressed-pages
throws "Directory store {path} is {format}; only {v4} is readable." A clean
flush writes nothing, since there is no legacy index left to upgrade.
Tests deleted with the surface they injected through: the v1 missing-catalog
load, pages-before-manifest, fault-before-manifest (4 cases), same-timestamp
page, mutation-during-flush and reader-lease tests. The orphan-page test now
checks through a fresh store pull instead of ReadPersistedGeneration.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
614 lines
22 KiB
C#
614 lines
22 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Threading;
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using System.Threading.Tasks;
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using MessagePack;
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namespace GameCult.Caching.MessagePack;
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/// <summary>
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/// MessagePack backing store that keeps a small schema manifest hot and stores each record as its own cold file.
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/// </summary>
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public sealed class DirectoryMessagePackBackingStore : CacheBackingStore
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{
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private const string IndexedFormatVersion = "cultcache.store.v4.directory-content-addressed-pages";
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private readonly FileInfo _manifestFile;
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private readonly DirectoryInfo _recordDirectory;
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private readonly object _mutationGate = new();
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private readonly ConcurrentDictionary<string, bool> _dirtyKeys = new(StringComparer.Ordinal);
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private readonly ConcurrentDictionary<string, bool> _deletedKeys = new(StringComparer.Ordinal);
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private readonly HashSet<string> _hydratedKeys = new(StringComparer.Ordinal);
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private Dictionary<string, CultPersistedRecord> _durableIndex = new(StringComparer.Ordinal);
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private CultSchemaCatalogEntry[] _durableCatalog = Array.Empty<CultSchemaCatalogEntry>();
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/// <summary>
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/// Creates a paged MessagePack backing store.
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/// </summary>
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public DirectoryMessagePackBackingStore(string manifestPath, string? recordDirectoryPath = null)
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{
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if (string.IsNullOrWhiteSpace(manifestPath))
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{
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throw new ArgumentException("Manifest path must be non-empty.", nameof(manifestPath));
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}
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_manifestFile = new FileInfo(manifestPath);
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_recordDirectory = new DirectoryInfo(recordDirectoryPath ?? DefaultRecordDirectoryPath(manifestPath));
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}
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/// <summary>
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/// Gets the default record directory path for a manifest path.
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/// </summary>
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public static string DefaultRecordDirectoryPath(string manifestPath) => manifestPath + ".records";
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/// <inheritdoc />
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public override void PullAll()
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{
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lock (_mutationGate)
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PullAllCore();
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}
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private void PullAllCore()
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{
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var traceStartup = string.Equals(
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Environment.GetEnvironmentVariable("CULTCACHE_TRACE_STARTUP_PHASES"),
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"1",
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StringComparison.Ordinal);
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var startupPhase = Stopwatch.StartNew();
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void Trace(string phase)
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{
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if (traceStartup)
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Console.WriteLine($"CultCache directory-pull phase {phase} took {startupPhase.Elapsed.TotalMilliseconds:0.###}ms.");
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startupPhase.Restart();
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}
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var reports = new List<CultSchemaMigrationReport>();
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var loaded = new Dictionary<string, CultStoredDocument>(StringComparer.Ordinal);
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using (AcquireCommitLease())
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{
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var manifest = ReadManifest();
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Trace($"manifest records={manifest.Records.Length}");
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_durableCatalog = manifest.SchemaCatalog;
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_durableIndex = manifest.Records
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.Where(record => !string.IsNullOrWhiteSpace(record.Key))
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.GroupBy(record => record.Key, StringComparer.Ordinal)
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.ToDictionary(group => group.Key, group => group.Last(), StringComparer.Ordinal);
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LoadRecordPages(
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manifest.Records.OrderBy(record => record.Key, StringComparer.Ordinal).ToArray(),
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manifest.SchemaCatalog,
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loaded,
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reports);
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Trace($"indexed-pages loaded={loaded.Count}");
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}
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foreach (var pair in loaded)
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{
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if (_dirtyKeys.ContainsKey(pair.Key) || _deletedKeys.ContainsKey(pair.Key))
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continue;
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if (Entries.TryGetValue(pair.Key, out var existing) &&
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string.Equals(existing.StoredAt, pair.Value.StoredAt, StringComparison.Ordinal) &&
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string.Equals(existing.Descriptor.SchemaId, pair.Value.Descriptor.SchemaId, StringComparison.Ordinal))
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{
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continue;
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}
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Entries[pair.Key] = pair.Value;
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Loaded?.Invoke(pair.Value);
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}
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foreach (var removedKey in _hydratedKeys.Where(key => !loaded.ContainsKey(key)).ToArray())
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{
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if (_dirtyKeys.ContainsKey(removedKey) || _deletedKeys.ContainsKey(removedKey))
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continue;
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if (Entries.TryRemove(removedKey, out var removed))
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Unloaded?.Invoke(removed);
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_hydratedKeys.Remove(removedKey);
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}
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foreach (var key in loaded.Keys)
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_hydratedKeys.Add(key);
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SetLastSchemaMigrationReports(reports);
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IsDirty = !_dirtyKeys.IsEmpty || !_deletedKeys.IsEmpty;
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Trace("publish");
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}
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/// <inheritdoc />
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public override bool ContainsDurableRecord(CultRecordKey key)
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{
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lock (_mutationGate)
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return _durableIndex.ContainsKey(key.Value) || base.ContainsDurableRecord(key);
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}
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/// <inheritdoc />
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public override void Push(CultStoredDocument entry)
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{
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lock (_mutationGate)
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{
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Entries[entry.Key.Value] = entry;
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_dirtyKeys[entry.Key.Value] = true;
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_deletedKeys.TryRemove(entry.Key.Value, out _);
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IsDirty = true;
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}
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}
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/// <inheritdoc />
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public override void Delete(CultStoredDocument entry)
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{
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lock (_mutationGate)
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{
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Entries.TryRemove(entry.Key.Value, out _);
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_dirtyKeys.TryRemove(entry.Key.Value, out _);
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_deletedKeys[entry.Key.Value] = true;
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IsDirty = true;
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}
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}
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/// <inheritdoc />
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public override void CommitBatch(
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IReadOnlyCollection<CultStoredDocument> upserts,
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IReadOnlyCollection<CultStoredDocument> deletes)
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{
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lock (_mutationGate)
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{
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var previousEntries = Entries.ToDictionary(pair => pair.Key, pair => pair.Value, StringComparer.Ordinal);
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var previousDirtyKeys = _dirtyKeys.Keys.ToArray();
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var previousDeletedKeys = _deletedKeys.Keys.ToArray();
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var wasDirty = IsDirty;
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try
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{
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foreach (var entry in deletes)
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{
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Entries.TryRemove(entry.Key.Value, out _);
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_dirtyKeys.TryRemove(entry.Key.Value, out _);
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_deletedKeys[entry.Key.Value] = true;
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}
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foreach (var entry in upserts)
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{
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Entries[entry.Key.Value] = entry;
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_dirtyKeys[entry.Key.Value] = true;
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_deletedKeys.TryRemove(entry.Key.Value, out _);
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}
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IsDirty = true;
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PushAllCore();
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}
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catch
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{
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Entries.Clear();
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foreach (var pair in previousEntries)
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Entries[pair.Key] = pair.Value;
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_dirtyKeys.Clear();
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foreach (var key in previousDirtyKeys)
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_dirtyKeys[key] = true;
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_deletedKeys.Clear();
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foreach (var key in previousDeletedKeys)
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_deletedKeys[key] = true;
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IsDirty = wasDirty;
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throw;
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}
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}
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}
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/// <inheritdoc />
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public override void PushAll()
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{
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lock (_mutationGate)
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PushAllCore();
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}
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private void PushAllCore()
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{
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if (!IsDirty)
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{
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return;
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}
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Directory.CreateDirectory(_manifestFile.DirectoryName!);
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Directory.CreateDirectory(_recordDirectory.FullName);
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using var commitLease = AcquireCommitLease();
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var currentManifest = ReadManifest();
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var currentIndex = currentManifest.Records.ToDictionary(record => record.Key, record => record, StringComparer.Ordinal);
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foreach (var key in _deletedKeys.Keys)
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currentIndex.Remove(key);
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foreach (var key in _dirtyKeys.Keys)
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{
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if (Entries.TryGetValue(key, out var stored))
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currentIndex[key] = ToIndexRecord(stored);
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}
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var catalogCandidates = currentManifest.SchemaCatalog
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.Concat(_durableCatalog)
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.Concat(Entries.Values.Select(entry => entry.Descriptor.ToCatalogEntry()))
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.GroupBy(entry => entry.SchemaId, StringComparer.Ordinal)
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.Select(group => group.Last())
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.ToArray();
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var usedSchemaIds = currentIndex.Values.Select(record => record.SchemaId).ToHashSet(StringComparer.Ordinal);
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var targetCatalog = catalogCandidates
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.Where(entry => usedSchemaIds.Contains(entry.SchemaId))
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.OrderBy(entry => entry.SchemaName, StringComparer.Ordinal)
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.ToArray();
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var keysToWrite = _dirtyKeys.Keys
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.OrderBy(value => value, StringComparer.Ordinal)
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.ToArray();
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foreach (var key in keysToWrite)
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{
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if (!Entries.TryGetValue(key, out var stored))
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{
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continue;
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}
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var record = ToPersistedRecord(stored, document =>
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CultDocumentMessagePackSerialization.SerializeUntyped(
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document,
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stored.Descriptor.DocumentType,
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Registry));
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var pagePayload = CultDocumentMessagePackSerialization.SerializePersistedRecord(record);
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var indexRecord = ToContentAddressedIndexRecord(record, pagePayload);
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currentIndex[key] = indexRecord;
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WriteFileAtomically(
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ContentAddressedRecordPath(indexRecord),
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pagePayload);
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}
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WriteManifest(targetCatalog, currentIndex.Values
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.OrderBy(record => record.Key, StringComparer.Ordinal)
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.ToArray());
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DeleteUnreferencedRecordPages(currentIndex.Values);
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_durableCatalog = targetCatalog;
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_durableIndex = currentIndex;
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_dirtyKeys.Clear();
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_deletedKeys.Clear();
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MarkFlushSucceeded();
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}
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private void WriteManifest(CultSchemaCatalogEntry[] catalog, CultPersistedRecord[] index)
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{
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var manifest = new CultPersistedStoreSnapshot
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{
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FormatVersion = IndexedFormatVersion,
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SchemaCatalog = catalog,
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Records = index
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};
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WriteFileAtomically(_manifestFile.FullName, CultDocumentMessagePackSerialization.SerializeSnapshot(manifest));
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}
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private void LoadRecordPages(
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CultPersistedRecord[] records,
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IReadOnlyCollection<CultSchemaCatalogEntry> catalogEntries,
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Dictionary<string, CultStoredDocument> loaded,
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List<CultSchemaMigrationReport> reports)
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{
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var tracePages = string.Equals(
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Environment.GetEnvironmentVariable("CULTCACHE_TRACE_STARTUP_PHASES"),
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"1",
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StringComparison.Ordinal);
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var recordReports = new CultSchemaMigrationReport[records.Length];
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var storedRecords = new CultStoredDocument?[records.Length];
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var pageBytes = tracePages ? new long[records.Length] : Array.Empty<long>();
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var pageElapsedTicks = tracePages ? new long[records.Length] : Array.Empty<long>();
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Parallel.For(
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0,
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records.Length,
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new ParallelOptions { MaxDegreeOfParallelism = Math.Min(Environment.ProcessorCount, 8) },
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index =>
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{
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var started = tracePages ? Stopwatch.GetTimestamp() : 0L;
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var metadata = records[index];
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var record = ReadPersistedRecordPage(metadata, out var pagePayload);
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var catalog = ResolveLegacyUncataloguedRecordCatalog(record, catalogEntries);
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recordReports[index] = Registry.ResolvePersistedSchemaReport(record.SchemaId, catalog);
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storedRecords[index] = ToStoredDocument(
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record,
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catalog,
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(type, payload) => CultDocumentMessagePackSerialization.DeserializeUntyped(type, payload, Registry));
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if (tracePages)
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{
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pageBytes[index] = pagePayload.LongLength;
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pageElapsedTicks[index] = Stopwatch.GetTimestamp() - started;
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}
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});
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if (tracePages)
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{
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var schemaNames = catalogEntries.ToDictionary(entry => entry.SchemaId, entry => entry.SchemaName, StringComparer.Ordinal);
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foreach (var group in records
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.Select((record, index) => new { record.SchemaId, Index = index })
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.Where(item => pageElapsedTicks[item.Index] > 0)
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.GroupBy(item => item.SchemaId, StringComparer.Ordinal)
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.Select(group => new
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{
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SchemaId = group.Key,
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Count = group.Count(),
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Bytes = group.Sum(item => pageBytes[item.Index]),
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TotalMs = group.Sum(item => pageElapsedTicks[item.Index]) * 1000d / Stopwatch.Frequency,
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MaxMs = group.Max(item => pageElapsedTicks[item.Index]) * 1000d / Stopwatch.Frequency
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})
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.OrderByDescending(group => group.TotalMs)
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.Take(10))
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{
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var schemaName = schemaNames.TryGetValue(group.SchemaId, out var name) ? name : group.SchemaId;
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Console.WriteLine(
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$"CultCache directory-page schema={schemaName} count={group.Count} bytes={group.Bytes} " +
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$"cumulative={group.TotalMs:0.###}ms max={group.MaxMs:0.###}ms.");
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}
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}
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for (var index = 0; index < storedRecords.Length; index++)
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{
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var stored = storedRecords[index];
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if (stored == null)
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continue;
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reports.Add(recordReports[index]);
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loaded[stored.Key.Value] = stored;
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}
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}
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private static CultPersistedRecord ToIndexRecord(CultStoredDocument stored) => new()
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{
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Key = stored.Key.Value,
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SchemaId = stored.Descriptor.SchemaId,
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StoredAt = stored.StoredAt,
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Payload = Array.Empty<byte>()
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};
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private static CultPersistedRecord ToContentAddressedIndexRecord(
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CultPersistedRecord record,
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byte[] pagePayload) => new()
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{
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Key = record.Key,
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SchemaId = record.SchemaId,
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StoredAt = record.StoredAt,
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Payload = HashPayload(pagePayload)
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};
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// A missing manifest is an empty store. An existing manifest in any other format is refused.
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private CultPersistedStoreSnapshot ReadManifest()
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{
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if (!File.Exists(_manifestFile.FullName))
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{
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return new CultPersistedStoreSnapshot
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{
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FormatVersion = IndexedFormatVersion,
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SchemaCatalog = Array.Empty<CultSchemaCatalogEntry>(),
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Records = Array.Empty<CultPersistedRecord>()
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};
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}
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var snapshot = CultDocumentMessagePackSerialization.DeserializeSnapshot(ReadAllBytesShared(_manifestFile.FullName));
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if (!string.Equals(snapshot.FormatVersion, IndexedFormatVersion, StringComparison.Ordinal))
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{
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throw new InvalidOperationException(
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$"Directory store {_manifestFile.FullName} is {snapshot.FormatVersion}; only {IndexedFormatVersion} is readable.");
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}
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return snapshot;
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}
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// Explicit compatibility path for records written before catalog precommit existed.
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private IReadOnlyCollection<CultSchemaCatalogEntry> ResolveLegacyUncataloguedRecordCatalog(
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CultPersistedRecord record,
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IReadOnlyCollection<CultSchemaCatalogEntry> manifestCatalog)
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{
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if (manifestCatalog.Any(entry => string.Equals(entry.SchemaId, record.SchemaId, StringComparison.Ordinal)))
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{
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return manifestCatalog;
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}
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var schemaVersion = TryReadPayloadSchemaVersion(record.Payload);
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if (string.IsNullOrWhiteSpace(schemaVersion))
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{
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return manifestCatalog;
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}
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var schemaName = InferSchemaName(schemaVersion);
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if (string.IsNullOrWhiteSpace(schemaName))
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{
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return manifestCatalog;
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}
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return manifestCatalog
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.Append(new CultSchemaCatalogEntry
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{
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SchemaId = record.SchemaId,
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SchemaName = schemaName,
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SchemaVersion = schemaVersion,
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ContentHash = record.SchemaId,
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CanonicalSchemaJson = "",
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CompatibleSchemaIds = Array.Empty<string>(),
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Members = Array.Empty<CultSchemaMemberCatalogEntry>()
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})
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.ToArray();
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}
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private static string TryReadPayloadSchemaVersion(byte[] payload)
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{
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if (payload == null || payload.Length == 0)
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{
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return "";
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}
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try
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{
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var reader = new MessagePackReader(payload);
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if (reader.NextMessagePackType != MessagePackType.Array)
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{
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return "";
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}
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if (reader.ReadArrayHeader() <= 0)
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{
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return "";
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}
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return reader.NextMessagePackType == MessagePackType.String
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? reader.ReadString() ?? ""
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: "";
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}
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catch
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{
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return "";
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}
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}
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private static string InferSchemaName(string schemaVersion)
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{
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var versionMarker = schemaVersion.LastIndexOf(".v", StringComparison.Ordinal);
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return versionMarker > 0 && versionMarker + 2 < schemaVersion.Length && char.IsDigit(schemaVersion[versionMarker + 2])
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? schemaVersion.Substring(0, versionMarker)
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: "";
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}
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private string ContentAddressedRecordPath(CultPersistedRecord metadata)
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{
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if (metadata.Payload == null || metadata.Payload.Length != 32)
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throw new InvalidDataException($"Record '{metadata.Key}' has no committed SHA-256 page identity.");
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var hash = BitConverter.ToString(metadata.Payload).Replace("-", string.Empty).ToLowerInvariant();
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return Path.Combine(_recordDirectory.FullName, $"{hash}.msgpack");
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}
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private static byte[] HashPayload(byte[] payload)
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{
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using var sha256 = SHA256.Create();
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return sha256.ComputeHash(payload);
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}
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private void DeleteUnreferencedRecordPages(IEnumerable<CultPersistedRecord> durableRecords)
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{
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var referenced = durableRecords
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.Select(ContentAddressedRecordPath)
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.ToHashSet(StringComparer.OrdinalIgnoreCase);
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foreach (var file in _recordDirectory.EnumerateFiles("*.msgpack"))
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{
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if (referenced.Contains(file.FullName))
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continue;
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try
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{
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File.Delete(file.FullName);
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}
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catch (IOException)
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{
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// An orphan is harmless: no committed manifest references it.
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}
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catch (UnauthorizedAccessException)
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{
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// Cleanup is best effort and never changes the committed generation.
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}
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}
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}
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|
|
private CultPersistedRecord ReadPersistedRecordPage(CultPersistedRecord metadata, out byte[] pagePayload)
|
|
{
|
|
var path = ContentAddressedRecordPath(metadata);
|
|
if (!File.Exists(path))
|
|
throw new InvalidDataException($"Committed record page '{path}' is missing from the selected manifest generation.");
|
|
pagePayload = ReadAllBytesShared(path);
|
|
if (!HashPayload(pagePayload).SequenceEqual(metadata.Payload))
|
|
throw new InvalidDataException($"Record page '{path}' does not match its committed content hash.");
|
|
var record = CultDocumentMessagePackSerialization.DeserializePersistedRecord(pagePayload);
|
|
if (!string.Equals(record.Key, metadata.Key, StringComparison.Ordinal))
|
|
throw new InvalidDataException($"Record page '{path}' contains key '{record.Key}', expected '{metadata.Key}'.");
|
|
return record;
|
|
}
|
|
|
|
private static void WriteFileAtomically(string path, byte[] payload)
|
|
{
|
|
var directory = Path.GetDirectoryName(path)!;
|
|
Directory.CreateDirectory(directory);
|
|
var tempPath = Path.Combine(directory, $".{Path.GetFileName(path)}.{Guid.NewGuid():N}.tmp");
|
|
|
|
try
|
|
{
|
|
using (var stream = new FileStream(
|
|
tempPath,
|
|
FileMode.CreateNew,
|
|
FileAccess.Write,
|
|
FileShare.None,
|
|
bufferSize: 4096,
|
|
FileOptions.WriteThrough))
|
|
{
|
|
stream.Write(payload, 0, payload.Length);
|
|
stream.Flush(true);
|
|
}
|
|
|
|
if (File.Exists(path))
|
|
{
|
|
ReplaceExistingFile(tempPath, path);
|
|
}
|
|
else
|
|
{
|
|
File.Move(tempPath, path);
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
if (File.Exists(tempPath))
|
|
{
|
|
File.Delete(tempPath);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static byte[] ReadAllBytesShared(string path)
|
|
{
|
|
using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
|
|
using var buffer = new MemoryStream();
|
|
stream.CopyTo(buffer);
|
|
return buffer.ToArray();
|
|
}
|
|
|
|
private FileStream AcquireCommitLease()
|
|
{
|
|
Directory.CreateDirectory(_recordDirectory.FullName);
|
|
var lockPath = Path.Combine(_recordDirectory.FullName, ".commit.lock");
|
|
var started = Stopwatch.StartNew();
|
|
while (true)
|
|
{
|
|
try
|
|
{
|
|
return new FileStream(
|
|
lockPath,
|
|
FileMode.OpenOrCreate,
|
|
FileAccess.ReadWrite,
|
|
FileShare.None,
|
|
bufferSize: 1,
|
|
FileOptions.WriteThrough);
|
|
}
|
|
catch (IOException) when (started.Elapsed < TimeSpan.FromSeconds(30))
|
|
{
|
|
Thread.Sleep(10);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void ReplaceExistingFile(string sourcePath, string destinationPath)
|
|
{
|
|
for (var attempt = 0; attempt < 3; attempt++)
|
|
{
|
|
try
|
|
{
|
|
File.Replace(sourcePath, destinationPath, null);
|
|
return;
|
|
}
|
|
catch (IOException) when (attempt < 2)
|
|
{
|
|
Thread.Sleep(10 * (attempt + 1));
|
|
}
|
|
catch (UnauthorizedAccessException) when (attempt < 2)
|
|
{
|
|
Thread.Sleep(10 * (attempt + 1));
|
|
}
|
|
}
|
|
|
|
File.Replace(sourcePath, destinationPath, null);
|
|
}
|
|
}
|