Piece IO

.gitignore

@@ -11,3 +11,9 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 filestore/_test/
+
+# JetBrains
+.idea
+
+.filecoin-build
+.update-modules

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "extern/filecoin-ffi"]
+	path = extern/filecoin-ffi
+	url = git@github.com:filecoin-project/filecoin-ffi.git

Makefile

@@ -0,0 +1,34 @@
+all: build
+.PHONY: all
+
+SUBMODULES=
+
+FFI_PATH:=extern/filecoin-ffi/
+FFI_DEPS:=libfilecoin.a filecoin.pc filecoin.h
+FFI_DEPS:=$(addprefix $(FFI_PATH),$(FFI_DEPS))
+
+$(FFI_DEPS): .filecoin-build ;
+
+.filecoin-build: $(FFI_PATH)
+	$(MAKE) -C $(FFI_PATH) $(FFI_DEPS:$(FFI_PATH)%=%)
+	@touch $@
+
+.update-modules:
+	git submodule update --init --recursive
+	@touch $@
+
+pieceio: .update-modules .filecoin-build
+	go build ./pieceio
+.PHONY: pieceio
+SUBMODULES+=pieceio
+
+filestore:
+	go build ./filestore
+.PHONY: filestore
+SUBMODULES+=filestore
+
+build: $(SUBMODULES)
+
+clean:
+	rm -f .filecoin-build
+	rm -f .update-modules

go.mod

@@ -3,6 +3,7 @@ module github.com/filecoin-project/go-fil-components
 go 1.13
 
 require (
+	github.com/filecoin-project/filecoin-ffi v0.0.0-20191210104338-2383ce072e95
 	github.com/filecoin-project/go-fil-filestore v0.0.0-20191202230242-40c6a5a2306c
 	github.com/gogo/protobuf v1.3.1 // indirect
 	github.com/google/go-cmp v0.3.1 // indirect
@@ -11,6 +12,7 @@ require (
 	github.com/ipfs/go-bitswap v0.1.8 // indirect
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-blockservice v0.1.3-0.20190908200855-f22eea50656c
+	github.com/ipfs/go-car v0.0.3-0.20191203022317-23b0a85fd1b1
 	github.com/ipfs/go-cid v0.0.4-0.20191112011718-79e75dffeb10
 	github.com/ipfs/go-datastore v0.1.0
 	github.com/ipfs/go-graphsync v0.0.4
@@ -40,6 +42,6 @@ require (
 	github.com/whyrusleeping/cbor-gen v0.0.0-20191116002219-891f55cd449d
 	golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456 // indirect
 	golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
-	gopkg.in/yaml.v2 v2.2.4 // indirect
 )
+
+replace github.com/filecoin-project/filecoin-ffi => ./extern/filecoin-ffi

pieceio/cario/cario.go

@@ -0,0 +1,42 @@
+package cario
+
+import (
+    "context"
+    "fmt"
+    "github.com/filecoin-project/go-fil-components/pieceio"
+    "github.com/ipfs/go-car"
+    "github.com/ipfs/go-cid"
+    "github.com/ipld/go-ipld-prime"
+    "github.com/ipld/go-ipld-prime/traversal/selector"
+    "io"
+)
+
+type carIO struct {
+}
+
+func NewCarIO() pieceio.CarIO {
+    return &carIO{}
+}
+
+func (c carIO) WriteCar(ctx context.Context, bs pieceio.ReadStore, payloadCid cid.Cid, node ipld.Node, w io.Writer) error {
+    selector, err := selector.ParseSelector(node)
+    if err != nil {
+        return err
+    }
+    return car.WriteSelectiveCar(ctx, bs, []car.CarDag{{Root: payloadCid, Selector: selector}}, w)
+}
+
+func (c carIO) LoadCar(bs pieceio.WriteStore, r io.Reader) (cid.Cid, error) {
+    header, err := car.LoadCar(bs, r)
+    if err != nil {
+        return cid.Undef, err
+    }
+    l := len(header.Roots)
+    if l == 0 {
+        return cid.Undef, fmt.Errorf("invalid header: missing root")
+    }
+    if l > 1 {
+        return cid.Undef, fmt.Errorf("invalid header: contains %d roots (expecting 1)", l)
+    }
+    return header.Roots[0], nil
+}

pieceio/padreader/padreader.go

@@ -0,0 +1,27 @@
+package padreader
+
+import (
+    ffi "github.com/filecoin-project/filecoin-ffi"
+    "github.com/filecoin-project/go-fil-components/pieceio"
+    "math/bits"
+)
+
+type padReader struct {
+}
+
+func NewPadReader() pieceio.PadReader {
+    return &padReader{}
+}
+
+// Functions bellow copied from lotus/lib/padreader/padreader.go
+func (p padReader) PaddedSize(size uint64) uint64 {
+    logv := 64 - bits.LeadingZeros64(size)
+
+    sectSize := uint64(1 << logv)
+    bound := ffi.GetMaxUserBytesPerStagedSector(sectSize)
+    if size <= bound {
+        return bound
+    }
+
+    return ffi.GetMaxUserBytesPerStagedSector(1 << (logv + 1))
+}

pieceio/pieceio.go

@@ -0,0 +1,81 @@
+package pieceio
+
+import (
+	"context"
+	"fmt"
+	"github.com/filecoin-project/go-fil-components/filestore"
+	"github.com/ipfs/go-cid"
+	"github.com/ipld/go-ipld-prime"
+	"io"
+	"io/ioutil"
+	"os"
+)
+
+type SectorCalculator interface {
+	// GeneratePieceCommitment takes a PADDED io stream and a total size and generates a commP
+	GeneratePieceCommitment(piece io.Reader, pieceSize uint64) ([]byte, error)
+}
+
+type PadReader interface {
+	// PaddedSize returns the expected size of a piece after it's been padded
+	PaddedSize(size uint64) uint64
+}
+
+type CarIO interface {
+	// WriteCar writes a given payload to a CAR file and into the passed IO stream
+	WriteCar(ctx context.Context, bs ReadStore, payloadCid cid.Cid, selector ipld.Node, w io.Writer) error
+	// LoadCar loads blocks into the a store from a given CAR file
+	LoadCar(bs WriteStore, r io.Reader) (cid.Cid, error)
+}
+
+type pieceIO struct {
+	padReader        PadReader
+	carIO            CarIO
+	sectorCalculator SectorCalculator
+	tempDir          filestore.Path
+}
+
+func NewPieceIO(padReader PadReader, carIO CarIO, sectorCalculator SectorCalculator, tempDir filestore.Path) PieceIO {
+	return &pieceIO{padReader, carIO, sectorCalculator, tempDir}
+}
+
+func (pio *pieceIO) GeneratePieceCommitment(bs ReadStore, payloadCid cid.Cid, selector ipld.Node) ([]byte, filestore.Path, error) {
+	f, err := ioutil.TempFile(string(pio.tempDir), "")
+	if err != nil {
+		return nil, "", err
+	}
+	err = pio.carIO.WriteCar(context.Background(), bs, payloadCid, selector, f)
+	if err != nil {
+		os.Remove(f.Name())
+		return nil, "", err
+	}
+	fi, err := f.Stat()
+	if err != nil {
+		os.Remove(f.Name())
+		return nil, "", err
+	}
+	pieceSize := uint64(fi.Size())
+	paddedSize := pio.padReader.PaddedSize(pieceSize)
+	remaining := paddedSize - pieceSize
+	padbuf := make([]byte, remaining)
+	padded, err := f.Write(padbuf)
+	if err != nil {
+		os.Remove(f.Name())
+		return nil, "", err
+	}
+	if uint64(padded) != remaining {
+		os.Remove(f.Name())
+		return nil, "", fmt.Errorf("wrote %d byte of padding while expecting %d to be written", padded, remaining)
+	}
+	f.Seek(0, io.SeekStart)
+	commitment, err := pio.sectorCalculator.GeneratePieceCommitment(f, paddedSize)
+	if err != nil {
+		os.Remove(f.Name())
+		return nil, "", err
+	}
+	return commitment, filestore.Path(f.Name()), nil
+}
+
+func (pio *pieceIO) ReadPiece(r io.Reader, bs WriteStore) (cid.Cid, error) {
+	return pio.carIO.LoadCar(bs, r)
+}

pieceio/pieceio_test.go

@@ -0,0 +1,165 @@
+package pieceio_test
+
+import (
+	"bytes"
+	"context"
+	"github.com/filecoin-project/go-fil-components/filestore"
+	"github.com/filecoin-project/go-fil-components/pieceio"
+	"github.com/filecoin-project/go-fil-components/pieceio/cario"
+	"github.com/filecoin-project/go-fil-components/pieceio/padreader"
+	"github.com/filecoin-project/go-fil-components/pieceio/sectorcalculator"
+	dag "github.com/ipfs/go-merkledag"
+	dstest "github.com/ipfs/go-merkledag/test"
+	ipldfree "github.com/ipld/go-ipld-prime/impl/free"
+	"github.com/ipld/go-ipld-prime/traversal/selector"
+	"github.com/ipld/go-ipld-prime/traversal/selector/builder"
+	"github.com/stretchr/testify/require"
+	"io"
+	"os"
+	"testing"
+)
+
+
+func Test_ThereAndBackAgain(t *testing.T) {
+	tempDir := filestore.Path("./tempDir")
+	sc := sectorcalculator.NewSectorCalculator(tempDir)
+	pr := padreader.NewPadReader()
+	cio := cario.NewCarIO()
+
+	pio := pieceio.NewPieceIO(pr, cio, sc, tempDir)
+
+	sourceBserv := dstest.Bserv()
+	sourceBs := sourceBserv.Blockstore()
+	dserv := dag.NewDAGService(sourceBserv)
+	a := dag.NewRawNode([]byte("aaaa"))
+	b := dag.NewRawNode([]byte("bbbb"))
+	c := dag.NewRawNode([]byte("cccc"))
+
+	nd1 := &dag.ProtoNode{}
+	nd1.AddNodeLink("cat", a)
+
+	nd2 := &dag.ProtoNode{}
+	nd2.AddNodeLink("first", nd1)
+	nd2.AddNodeLink("dog", b)
+
+	nd3 := &dag.ProtoNode{}
+	nd3.AddNodeLink("second", nd2)
+	nd3.AddNodeLink("bear", c)
+
+	ctx := context.Background()
+	dserv.Add(ctx, a)
+	dserv.Add(ctx, b)
+	dserv.Add(ctx, c)
+	dserv.Add(ctx, nd1)
+	dserv.Add(ctx, nd2)
+	dserv.Add(ctx, nd3)
+
+	ssb := builder.NewSelectorSpecBuilder(ipldfree.NodeBuilder())
+	node := ssb.ExploreFields(func(efsb builder.ExploreFieldsSpecBuilder) {
+		efsb.Insert("Links",
+			ssb.ExploreIndex(1, ssb.ExploreRecursive(selector.RecursionLimitNone(), ssb.ExploreAll(ssb.ExploreRecursiveEdge()))))
+	}).Node()
+
+	bytes, filename, err := pio.GeneratePieceCommitment(sourceBs, nd3.Cid(), node)
+	require.NoError(t, err)
+	for _, b := range bytes {
+		require.NotEqual(t, 0, b)
+	}
+	f, err := os.Open(string(filename))
+	require.NoError(t, err)
+	info, err := os.Stat(string(filename))
+	require.NoError(t, err)
+	bufSize := int64(16) // small buffer to illustrate the logic
+	buf := make([]byte, bufSize)
+	var readErr error
+	padStart := int64(-1)
+	loops := int64(-1)
+	read := 0
+	skipped, err := f.Seek(info.Size()/2, io.SeekStart)
+	require.NoError(t, err)
+	for readErr == nil {
+		loops++
+		read, readErr = f.Read(buf)
+		for idx := int64(0); idx < int64(read); idx++ {
+			if buf[idx] == 0 {
+				if padStart == -1 {
+					padStart = skipped + loops * bufSize + idx
+				}
+			} else {
+				padStart = -1
+			}
+		}
+	}
+	f.Seek(0, io.SeekStart)
+	var reader io.Reader
+	if padStart != -1 {
+		reader = io.LimitReader(f, padStart)
+	} else {
+		reader = f
+	}
+
+	id, err := pio.ReadPiece(reader, sourceBs)
+	os.Remove(string(filename))
+	require.NoError(t, err)
+	require.Equal(t, nd3.Cid(), id)
+}
+
+func Test_StoreRestoreMemoryBuffer(t *testing.T) {
+	tempDir := filestore.Path("./tempDir")
+	sc := sectorcalculator.NewSectorCalculator(tempDir)
+	pr := padreader.NewPadReader()
+	cio := cario.NewCarIO()
+
+	pio := pieceio.NewPieceIO(pr, cio, sc, tempDir)
+
+	sourceBserv := dstest.Bserv()
+	sourceBs := sourceBserv.Blockstore()
+	dserv := dag.NewDAGService(sourceBserv)
+	a := dag.NewRawNode([]byte("aaaa"))
+	b := dag.NewRawNode([]byte("bbbb"))
+	c := dag.NewRawNode([]byte("cccc"))
+
+	nd1 := &dag.ProtoNode{}
+	nd1.AddNodeLink("cat", a)
+
+	nd2 := &dag.ProtoNode{}
+	nd2.AddNodeLink("first", nd1)
+	nd2.AddNodeLink("dog", b)
+
+	nd3 := &dag.ProtoNode{}
+	nd3.AddNodeLink("second", nd2)
+	nd3.AddNodeLink("bear", c)
+
+	ctx := context.Background()
+	dserv.Add(ctx, a)
+	dserv.Add(ctx, b)
+	dserv.Add(ctx, c)
+	dserv.Add(ctx, nd1)
+	dserv.Add(ctx, nd2)
+	dserv.Add(ctx, nd3)
+
+	ssb := builder.NewSelectorSpecBuilder(ipldfree.NodeBuilder())
+	node := ssb.ExploreFields(func(efsb builder.ExploreFieldsSpecBuilder) {
+		efsb.Insert("Links",
+			ssb.ExploreIndex(1, ssb.ExploreRecursive(selector.RecursionLimitNone(), ssb.ExploreAll(ssb.ExploreRecursiveEdge()))))
+	}).Node()
+
+	commitment, filename, err := pio.GeneratePieceCommitment(sourceBs, nd3.Cid(), node)
+	require.NoError(t, err)
+	for _, b := range commitment {
+		require.NotEqual(t, 0, b)
+	}
+	f, err := os.Open(string(filename))
+	require.NoError(t, err)
+	defer func () {
+		f.Close()
+		os.Remove(f.Name())
+	}()
+	info, err := os.Stat(string(filename))
+	buf := make([]byte, info.Size())
+	f.Read(buf)
+	buffer := bytes.NewBuffer(buf)
+	secondCommitment, err := sc.GeneratePieceCommitment(buffer, uint64(info.Size()))
+	require.NoError(t, err)
+	require.Equal(t, commitment, secondCommitment)
+}