object/store/dual: Add a basic dual composr

1 files changed, 263 insertions, 0 deletions

diff --git a/object/store/dual/dual_test.go b/object/store/dual/dual_test.go
new file mode 100644
index 00000000..bccd378f
--- /dev/null
+++ b/object/store/dual/dual_test.go
@@ -0,0 +1,263 @@
+package dual_test
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"codeberg.org/lindenii/furgit/internal/testgit"
+	objectid "codeberg.org/lindenii/furgit/object/id"
+	objectstore "codeberg.org/lindenii/furgit/object/store"
+	"codeberg.org/lindenii/furgit/object/store/dual"
+	"codeberg.org/lindenii/furgit/object/store/loose"
+	"codeberg.org/lindenii/furgit/object/store/packed"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+func fixturePath(t *testing.T, algo objectid.Algorithm, name string) string {
+	t.Helper()
+
+	return filepath.Join("..", "packed", "internal", "ingest", "testdata", "fixtures", algo.String(), name)
+}
+
+func fixtureBytes(t *testing.T, algo objectid.Algorithm, name string) []byte {
+	t.Helper()
+
+	path := fixturePath(t, algo, name)
+	dir := filepath.Dir(path)
+	base := filepath.Base(path)
+
+	root, err := os.OpenRoot(dir)
+	if err != nil {
+		t.Fatalf("open fixture root %q: %v", dir, err)
+	}
+
+	defer func() {
+		err := root.Close()
+		if err != nil {
+			t.Fatalf("close fixture root %q: %v", dir, err)
+		}
+	}()
+
+	data, err := root.ReadFile(base)
+	if err != nil {
+		t.Fatalf("read fixture %q: %v", base, err)
+	}
+
+	return data
+}
+
+func fixtureMetadata(t *testing.T, algo objectid.Algorithm) map[string]string {
+	t.Helper()
+
+	data := fixtureBytes(t, algo, "METADATA.txt")
+	out := make(map[string]string)
+
+	for line := range strings.SplitSeq(strings.TrimSpace(string(data)), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+
+		key, value, ok := strings.Cut(line, "=")
+		if !ok {
+			t.Fatalf("invalid fixture metadata line %q", line)
+		}
+
+		out[strings.TrimSpace(key)] = strings.TrimSpace(value)
+	}
+
+	return out
+}
+
+func fixtureOID(t *testing.T, algo objectid.Algorithm, key string) objectid.ObjectID {
+	t.Helper()
+
+	meta := fixtureMetadata(t, algo)
+	hex, ok := meta[key]
+	if !ok {
+		t.Fatalf("missing fixture metadata key %q", key)
+	}
+
+	id, err := objectid.ParseHex(algo, hex)
+	if err != nil {
+		t.Fatalf("parse fixture metadata oid %q: %v", hex, err)
+	}
+
+	return id
+}
+
+func newDualStore(t *testing.T, repo *testgit.TestRepo, algo objectid.Algorithm) *dual.Dual {
+	t.Helper()
+
+	objectsRoot := repo.OpenObjectsRoot(t)
+	looseStore, err := loose.New(objectsRoot, algo)
+	if err != nil {
+		t.Fatalf("loose.New: %v", err)
+	}
+
+	packRoot := repo.OpenPackRoot(t)
+	packedStore, err := packed.New(packRoot, algo, packed.Options{WriteRev: true})
+	if err != nil {
+		t.Fatalf("packed.New: %v", err)
+	}
+
+	return dual.New(looseStore, packedStore)
+}
+
+func TestDualReadsWritesAndQuarantine(t *testing.T) {
+	t.Parallel()
+
+	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) {
+		head := fixtureOID(t, algo, "head")
+		packBytes := fixtureBytes(t, algo, "nonthin.pack")
+
+		repo := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: algo, Bare: true})
+		store := newDualStore(t, repo, algo)
+
+		quarantiner, ok := any(store).(objectstore.PackQuarantiner)
+		if !ok {
+			t.Fatal("dual does not implement PackQuarantiner")
+		}
+
+		quarantine, err := quarantiner.BeginPackQuarantine(objectstore.PackQuarantineOptions{})
+		if err != nil {
+			t.Fatalf("BeginPackQuarantine: %v", err)
+		}
+
+		err = quarantine.WritePack(bytes.NewReader(packBytes), objectstore.PackWriteOptions{RequireTrailingEOF: true})
+		if err != nil {
+			t.Fatalf("quarantine.WritePack: %v", err)
+		}
+
+		objectQ, ok := any(quarantine).(objectstore.ObjectQuarantine)
+		if !ok {
+			t.Fatal("pack quarantine does not also implement ObjectQuarantine")
+		}
+
+		looseContent := []byte("dual quarantine loose object\n")
+		looseID, err := objectQ.WriteBytesContent(objecttype.TypeBlob, looseContent)
+		if err != nil {
+			t.Fatalf("quarantine.WriteBytesContent: %v", err)
+		}
+
+		ty, _, err := quarantine.ReadHeader(head)
+		if err != nil {
+			t.Fatalf("quarantine.ReadHeader(pack): %v", err)
+		}
+
+		if ty != objecttype.TypeCommit {
+			t.Fatalf("quarantine.ReadHeader(pack) type = %v, want commit", ty)
+		}
+
+		ty, got, err := quarantine.ReadBytesContent(looseID)
+		if err != nil {
+			t.Fatalf("quarantine.ReadBytesContent(loose): %v", err)
+		}
+
+		if ty != objecttype.TypeBlob {
+			t.Fatalf("quarantine.ReadBytesContent(loose) type = %v, want blob", ty)
+		}
+
+		if !bytes.Equal(got, looseContent) {
+			t.Fatal("quarantine.ReadBytesContent(loose) mismatch")
+		}
+
+		_, _, err = store.ReadHeader(head)
+		if err == nil {
+			t.Fatal("store.ReadHeader unexpectedly saw quarantined pack object before promote")
+		}
+
+		_, _, err = store.ReadBytesContent(looseID)
+		if err == nil {
+			t.Fatal("store.ReadBytesContent unexpectedly saw quarantined loose object before promote")
+		}
+
+		err = quarantine.Promote()
+		if err != nil {
+			t.Fatalf("quarantine.Promote: %v", err)
+		}
+
+		err = store.Refresh()
+		if err != nil {
+			t.Fatalf("store.Refresh: %v", err)
+		}
+
+		ty, _, err = store.ReadHeader(head)
+		if err != nil {
+			t.Fatalf("store.ReadHeader(pack): %v", err)
+		}
+
+		if ty != objecttype.TypeCommit {
+			t.Fatalf("store.ReadHeader(pack) type = %v, want commit", ty)
+		}
+
+		ty, got, err = store.ReadBytesContent(looseID)
+		if err != nil {
+			t.Fatalf("store.ReadBytesContent(loose): %v", err)
+		}
+
+		if ty != objecttype.TypeBlob {
+			t.Fatalf("store.ReadBytesContent(loose) type = %v, want blob", ty)
+		}
+
+		if !bytes.Equal(got, looseContent) {
+			t.Fatal("store.ReadBytesContent(loose) mismatch")
+		}
+	})
+}
+
+func TestDualQuarantineDiscardDropsBothHalves(t *testing.T) {
+	t.Parallel()
+
+	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) {
+		head := fixtureOID(t, algo, "head")
+		packBytes := fixtureBytes(t, algo, "nonthin.pack")
+
+		repo := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: algo, Bare: true})
+		store := newDualStore(t, repo, algo)
+
+		quarantiner := any(store).(objectstore.ObjectQuarantiner)
+		quarantine, err := quarantiner.BeginObjectQuarantine(objectstore.ObjectQuarantineOptions{})
+		if err != nil {
+			t.Fatalf("BeginObjectQuarantine: %v", err)
+		}
+
+		packQ, ok := any(quarantine).(objectstore.PackQuarantine)
+		if !ok {
+			t.Fatal("object quarantine does not also implement PackQuarantine")
+		}
+
+		err = packQ.WritePack(bytes.NewReader(packBytes), objectstore.PackWriteOptions{RequireTrailingEOF: true})
+		if err != nil {
+			t.Fatalf("quarantine.WritePack: %v", err)
+		}
+
+		looseID, err := quarantine.WriteBytesContent(objecttype.TypeBlob, []byte("discarded dual object\n"))
+		if err != nil {
+			t.Fatalf("quarantine.WriteBytesContent: %v", err)
+		}
+
+		err = quarantine.Discard()
+		if err != nil {
+			t.Fatalf("quarantine.Discard: %v", err)
+		}
+
+		err = store.Refresh()
+		if err != nil {
+			t.Fatalf("store.Refresh: %v", err)
+		}
+
+		_, _, err = store.ReadHeader(head)
+		if err == nil {
+			t.Fatal("store.ReadHeader unexpectedly saw discarded pack object")
+		}
+
+		_, _, err = store.ReadBytesContent(looseID)
+		if err == nil {
+			t.Fatal("store.ReadBytesContent unexpectedly saw discarded loose object")
+		}
+	})
+}