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import ( "bytes" "context" "os" "sort" "testing" "time"
"github.com/stretchr/testify/require" "stream.place/streamplace/pkg/bdasl" "stream.place/streamplace/pkg/blob" "stream.place/streamplace/pkg/log" "stream.place/streamplace/pkg/muxl")
// TestPerSegmentMetafileAccumulation proves the archival model: emitting one// RunMuxlMetafile per signed canonical segment (the per-fragment archive unit)// and concatenating them in canonical byte order reproduces exactly the segment// portion of the whole-blob RunMuxlMetafiles stream — so the init metafile is// just the stream prefix, and synthesizing a flat header from// [init][per-segment metafiles] is byte-identical to synthesizing from the// whole-blob stream. That's what lets ingest archive a metafile per segment as// it's signed (no separate Metafiles pass over the fragments).//// Needs gstreamer + the new muxl (local replace), so it runs in the cgo container.func TestPerSegmentMetafileAccumulation(t *testing.T) { warmGST()
ctx, cancel := context.WithCancel(context.Background()) defer cancel() ctx = log.WithLogValues(ctx, "test", "TestPerSegmentMetafileAccumulation")
fixture, err := os.ReadFile(getFixture("5sec.mp4")) require.NoError(t, err) signer, err := newUploadSigner(time.Now()) require.NoError(t, err)
store, err := blob.NewFileStore(t.TempDir()) require.NoError(t, err) out := &bytes.Buffer{} hasher := bdasl.NewWriter() dst := teeWriter{hasher, out} mb := newMetafileBuilder(ctx, store) _, err = streamThroughMuxl(ctx, bytes.NewReader(fixture), int64(len(fixture)), dst, mb, signer.SignerInput) require.NoError(t, err) canon := out.Bytes() meta := mb.Finalize(hasher.CID(), int64(len(canon)))
// Whole-blob metafile stream (init + all segments). var fullStream bytes.Buffer require.NoError(t, muxl.RunMuxlMetafiles(ctx, bytes.NewReader(canon), &fullStream))
// Extract each signed .m4s in canonical byte order (every per-track-per-GoP // chunk, sorted by offset = the interleave order) and emit its metafile. type ref struct{ off, size int64 } var refs []ref for _, tr := range meta.Tracks { for _, s := range tr.Segments { refs = append(refs, ref{s.Offset, s.Size}) } } sort.Slice(refs, func(i, j int) bool { return refs[i].off < refs[j].off })
var segStream bytes.Buffer var firstMF []byte for i, r := range refs { m4s := canon[r.off : r.off+r.size] mf, err := muxl.RunMuxlMetafile(ctx, m4s) require.NoError(t, err) require.NotEmpty(t, mf, "per-segment metafile must be non-empty") if i == 0 { firstMF = mf } segStream.Write(mf) }
// Diagnostics: how do the per-segment metafiles relate to the whole stream? t.Logf("segments=%d fullStream=%d segStream(concat)=%d init≈%d", len(refs), fullStream.Len(), segStream.Len(), fullStream.Len()-segStream.Len()) t.Logf("full HasSuffix(segStream)=%v Contains(segStream)=%v", bytes.HasSuffix(fullStream.Bytes(), segStream.Bytes()), bytes.Contains(fullStream.Bytes(), segStream.Bytes())) t.Logf("first per-seg metafile len=%d found in fullStream at idx=%d", len(firstMF), bytes.Index(fullStream.Bytes(), firstMF))
// Whole-blob synth (the proven path) is the oracle header. var hWhole bytes.Buffer require.NoError(t, muxl.RunMuxlSynthesizeFlatHeader(ctx, bytes.NewReader(fullStream.Bytes()), &hWhole)) t.Logf("whole-blob synth header len=%d", hWhole.Len())
// Target model: once muxl drops the init/segment distinction (each // per-segment Metafile becomes self-contained — carries its own catalog), // the header is synthesized directly from the concatenation of the N // per-segment metafiles, no separate init. Until that lands, segStream has // no catalog and the synth errors — skip rather than fail the suite. var hParts bytes.Buffer if err := muxl.RunMuxlSynthesizeFlatHeader(ctx, bytes.NewReader(segStream.Bytes()), &hParts); err != nil { t.Skipf("per-segment metafiles not yet self-contained (pending muxl init-distinction removal): %v", err) } require.Equal(t, hWhole.Bytes(), hParts.Bytes(), "synth from N self-contained per-segment metafiles must match the whole-blob synth")}