Baustein 6: Datei-Anhaenge synchronisieren (Kapitel 10)
Anhaenge laufen bewusst NICHT ueber den JSON-Ereigniskanal (wuerde ihn
fuer Fotos/Scans stark aufblaehen), sondern ueber einen eigenen
verschluesselten Binaerkanal - analog zum bereits bestehenden Muster
in SnapshotService.
- Neue Endpunkte POST/GET /api/sync/attachments/{storageId} in
LehrerApp.Api (AttachmentStore, dateibasiert je Nutzer)
- EventQueue: neue, vom JSON-Ereignis getrennte Warteliste fuer
ausstehende Uploads (SyncEventPublisher traegt Anhaenge einer
gespeicherten Documentation dort ein)
- AttachmentSyncer laedt ausstehende Anhaenge hoch (in
SyncEngine.SyncNowAsync nach dem Event-Push)
- EventApplier laedt fehlende Anhaenge nach dem Anwenden eines
Documentation-Ereignisses nach - ueber die rohe Collection statt
IAttachmentStorage.Upload, da dieses immer eine neue Id vergaebe und
hier die Original-StorageId erhalten bleiben muss
Round-Trip-Tests belegen byteidentische Uebertragung.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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using LehrerApp.Data;
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using LehrerApp.Sync.Crypto;
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using Xunit;
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namespace LehrerApp.Sync.Tests;
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public sealed class AttachmentSyncerTests
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{
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private static LiteDbContext NewInMemoryContext() => new(new MemoryStream());
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private static readonly byte[] Key = SyncCrypto.GenerateKey();
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[Fact]
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public async Task UploadPendingAsync_LaedtVerschluesselteBytesHochUndMarkiertAlsErledigt()
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{
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using var temp = new TempEventQueue();
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using var db = NewInMemoryContext();
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var storageId = Guid.NewGuid().ToString("N");
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db.Attachments.Upload(storageId, "brief.pdf", new MemoryStream([1, 2, 3, 4]));
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temp.Queue.QueueAttachmentUpload(storageId);
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// Bytes MÜSSEN synchron innerhalb des Handler-Callbacks gelesen werden: AttachmentSyncer
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// disposed sein ByteArrayContent direkt nach dem PostAsync-Aufruf (eigenes "using"),
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// ein Zugriff auf request.Content danach würde ObjectDisposedException werfen.
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byte[]? uploadedEncrypted = null;
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var handler = new FakeHttpMessageHandler(req =>
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{
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uploadedEncrypted = req.Content!.ReadAsByteArrayAsync().GetAwaiter().GetResult();
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return new HttpResponseMessage(System.Net.HttpStatusCode.OK);
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});
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var http = new HttpClient(handler) { BaseAddress = new Uri("https://example.invalid") };
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var syncer = new AttachmentSyncer(db, http, Key);
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await syncer.UploadPendingAsync(temp.Queue);
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var request = Assert.Single(handler.Requests);
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Assert.Equal(HttpMethod.Post, request.Method);
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Assert.Equal($"/api/sync/attachments/{storageId}", request.RequestUri!.AbsolutePath);
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Assert.NotNull(uploadedEncrypted);
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Assert.Equal([1, 2, 3, 4], SyncCrypto.Decrypt(uploadedEncrypted!, Key));
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Assert.Empty(temp.Queue.GetPendingAttachmentUploads());
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}
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[Fact]
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public async Task UploadPendingAsync_LokalNichtMehrVorhandenerAnhang_WirdOhneUploadAlsErledigtMarkiert()
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{
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using var temp = new TempEventQueue();
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using var db = NewInMemoryContext();
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temp.Queue.QueueAttachmentUpload("laengst-geloescht");
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var handler = new FakeHttpMessageHandler(_ => new HttpResponseMessage(System.Net.HttpStatusCode.OK));
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var http = new HttpClient(handler) { BaseAddress = new Uri("https://example.invalid") };
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var syncer = new AttachmentSyncer(db, http, Key);
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await syncer.UploadPendingAsync(temp.Queue);
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Assert.Empty(handler.Requests);
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Assert.Empty(temp.Queue.GetPendingAttachmentUploads());
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}
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private sealed class TempEventQueue : IDisposable
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{
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private readonly string _directory = Path.Combine(
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Path.GetTempPath(), $"lehrerapp-sync-tests-attachments-{Guid.NewGuid():N}");
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public EventQueue Queue { get; }
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public TempEventQueue()
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{
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Directory.CreateDirectory(_directory);
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Queue = new EventQueue(Path.Combine(_directory, "queue.db"));
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}
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public void Dispose()
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{
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Queue.Dispose();
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if (Directory.Exists(_directory)) Directory.Delete(_directory, recursive: true);
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}
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}
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}
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