fix: ffiwrapper: Close readers in AddPiece

storage/sealer/ffiwrapper/sealer_cgo.go

@@ -60,7 +60,9 @@ func (sb *Sealer) DataCid(ctx context.Context, pieceSize abi.UnpaddedPieceSize,
 			log.Warnf("DataCid: cannot close pieceData reader %T because it is not an io.Closer", origPieceData)
 			return
 		}
-		closer.Close() //nolint:errcheck
+		if err := closer.Close(); err != nil {
+			log.Warnw("closing pieceData in DataCid", "error", err)
+		}
 	}()
 
 	pieceData = io.LimitReader(io.MultiReader(
@@ -182,7 +184,19 @@ func (sb *Sealer) DataCid(ctx context.Context, pieceSize abi.UnpaddedPieceSize,
 	}, nil
 }
 
-func (sb *Sealer) AddPiece(ctx context.Context, sector storiface.SectorRef, existingPieceSizes []abi.UnpaddedPieceSize, pieceSize abi.UnpaddedPieceSize, file storiface.Data) (abi.PieceInfo, error) {
+func (sb *Sealer) AddPiece(ctx context.Context, sector storiface.SectorRef, existingPieceSizes []abi.UnpaddedPieceSize, pieceSize abi.UnpaddedPieceSize, pieceData storiface.Data) (abi.PieceInfo, error) {
+	origPieceData := pieceData
+	defer func() {
+		closer, ok := origPieceData.(io.Closer)
+		if !ok {
+			log.Warnf("AddPiece: cannot close pieceData reader %T because it is not an io.Closer", origPieceData)
+			return
+		}
+		if err := closer.Close(); err != nil {
+			log.Warnw("closing pieceData in AddPiece", "error", err)
+		}
+	}()
+
 	// TODO: allow tuning those:
 	chunk := abi.PaddedPieceSize(4 << 20)
 	parallel := runtime.NumCPU()
@@ -248,7 +262,7 @@ func (sb *Sealer) AddPiece(ctx context.Context, sector storiface.SectorRef, exis
 
 	pw := fr32.NewPadWriter(w)
 
-	pr := io.TeeReader(io.LimitReader(file, int64(pieceSize)), pw)
+	pr := io.TeeReader(io.LimitReader(pieceData, int64(pieceSize)), pw)
 
 	throttle := make(chan []byte, parallel)
 	piecePromises := make([]func() (abi.PieceInfo, error), 0)

storage/sealer/ffiwrapper/sealer_test.go

@@ -991,3 +991,87 @@ func TestPoStChallengeAssumptions(t *testing.T) {
 		require.Len(t, c1.Challenges, 3)
 	}
 }
+
+func TestDCAPCloses(t *testing.T) {
+	sz := abi.PaddedPieceSize(2 << 10).Unpadded()
+
+	cdir, err := ioutil.TempDir("", "sbtest-c-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	miner := abi.ActorID(123)
+
+	sp := &basicfs.Provider{
+		Root: cdir,
+	}
+	sb, err := New(sp)
+	if err != nil {
+		t.Fatalf("%+v", err)
+	}
+	cleanup := func() {
+		if t.Failed() {
+			fmt.Printf("not removing %s\n", cdir)
+			return
+		}
+		if err := os.RemoveAll(cdir); err != nil {
+			t.Error(err)
+		}
+	}
+	t.Cleanup(cleanup)
+
+	t.Run("DataCid", func(t *testing.T) {
+		r := rand.New(rand.NewSource(0x7e5))
+
+		clr := &closeAssertReader{
+			Reader: io.LimitReader(r, int64(sz)),
+		}
+
+		c, err := sb.DataCid(context.TODO(), sz, clr)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		require.Equal(t, "baga6ea4seaqeje7jy4hufnybpo7ckxzujaigqbcxhdjq7ojb4b6xzgqdugkyciq", c.PieceCID.String())
+		require.True(t, clr.closed)
+	})
+
+	t.Run("AddPiece", func(t *testing.T) {
+		r := rand.New(rand.NewSource(0x7e5))
+
+		clr := &closeAssertReader{
+			Reader: io.LimitReader(r, int64(sz)),
+		}
+
+		c, err := sb.AddPiece(context.TODO(), storiface.SectorRef{
+			ID: abi.SectorID{
+				Miner:  miner,
+				Number: 0,
+			},
+			ProofType: abi.RegisteredSealProof_StackedDrg2KiBV1_1,
+		}, nil, sz, clr)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		require.Equal(t, "baga6ea4seaqeje7jy4hufnybpo7ckxzujaigqbcxhdjq7ojb4b6xzgqdugkyciq", c.PieceCID.String())
+		require.True(t, clr.closed)
+	})
+
+}
+
+type closeAssertReader struct {
+	io.Reader
+	closed bool
+}
+
+func (c *closeAssertReader) Close() error {
+	if c.closed {
+		panic("double close")
+	}
+
+	c.closed = true
+
+	return nil
+}
+
+var _ io.Closer = &closeAssertReader{}