Create a FilestoreNode object to carry PosInfo

When doing a filestore add, we wrap whatever nodes we create in a
FilestoreNode object and add the PosInfo to it so that the filestore
will be able to extract information as needed.

Edited by whyrusleeping

License: MIT
Signed-off-by: Kevin Atkinson <k@kevina.org>

commands/files/file.go

@@ -55,3 +55,8 @@ type SizeFile interface {
 
 	Size() (int64, error)
 }
+
+type FileInfo interface {
+	FullPath() string
+	Stat() os.FileInfo
+}

core/coreunix/add.go

@@ -398,7 +398,12 @@ func (adder *Adder) addFile(file files.File) error {
 	// progress updates to the client (over the output channel)
 	var reader io.Reader = file
 	if adder.Progress {
-		reader = &progressReader{file: file, out: adder.Out}
+		rdr := &progressReader{file: file, out: adder.Out}
+		if fi, ok := file.(files.FileInfo); ok {
+			reader = &progressReader2{rdr, fi}
+		} else {
+			reader = rdr
+		}
 	}
 
 	dagnode, err := adder.add(reader)
@@ -520,3 +525,8 @@ func (i *progressReader) Read(p []byte) (int, error) {
 
 	return n, err
 }
+
+type progressReader2 struct {
+	*progressReader
+	files.FileInfo
+}

importer/balanced/builder.go

@@ -9,10 +9,12 @@ import (
 )
 
 func BalancedLayout(db *h.DagBuilderHelper) (node.Node, error) {
+	var offset uint64 = 0
 	var root *h.UnixfsNode
 	for level := 0; !db.Done(); level++ {
 
 		nroot := h.NewUnixfsNode()
+		db.SetPosInfo(nroot, 0)
 
 		// add our old root as a child of the new root.
 		if root != nil { // nil if it's the first node.
@@ -22,11 +24,13 @@ func BalancedLayout(db *h.DagBuilderHelper) (node.Node, error) {
 		}
 
 		// fill it up.
-		if err := fillNodeRec(db, nroot, level); err != nil {
+		if err := fillNodeRec(db, nroot, level, offset); err != nil {
 			return nil, err
 		}
 
+		offset = nroot.FileSize()
 		root = nroot
+
 	}
 	if root == nil {
 		root = h.NewUnixfsNode()
@@ -50,7 +54,7 @@ func BalancedLayout(db *h.DagBuilderHelper) (node.Node, error) {
 // it returns the total dataSize of the node, and a potential error
 //
 // warning: **children** pinned indirectly, but input node IS NOT pinned.
-func fillNodeRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int) error {
+func fillNodeRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int, offset uint64) error {
 	if depth < 0 {
 		return errors.New("attempt to fillNode at depth < 0")
 	}
@@ -69,8 +73,9 @@ func fillNodeRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int) error {
 	// while we have room AND we're not done
 	for node.NumChildren() < db.Maxlinks() && !db.Done() {
 		child := h.NewUnixfsNode()
+		db.SetPosInfo(child, offset)
 
-		err := fillNodeRec(db, child, depth-1)
+		err := fillNodeRec(db, child, depth-1, offset)
 		if err != nil {
 			return err
 		}
@@ -78,6 +83,7 @@ func fillNodeRec(db *h.DagBuilderHelper, node *h.UnixfsNode, depth int) error {
 		if err := node.AddChild(child, db); err != nil {
 			return err
 		}
+		offset += child.FileSize()
 	}
 
 	return nil

importer/chunk/rabin.go

@@ -10,7 +10,8 @@ import (
 var IpfsRabinPoly = chunker.Pol(17437180132763653)
 
 type Rabin struct {
-	r *chunker.Chunker
+	r      *chunker.Chunker
+	reader io.Reader
 }
 
 func NewRabin(r io.Reader, avgBlkSize uint64) *Rabin {
@@ -25,7 +26,8 @@ func NewRabinMinMax(r io.Reader, min, avg, max uint64) *Rabin {
 	ch := chunker.New(r, IpfsRabinPoly, h, avg, min, max)
 
 	return &Rabin{
-		r: ch,
+		r:      ch,
+		reader: r,
 	}
 }
 
@@ -37,3 +39,7 @@ func (r *Rabin) NextBytes() ([]byte, error) {
 
 	return ch.Data, nil
 }
+
+func (r *Rabin) Reader() io.Reader {
+	return r.reader
+}

importer/chunk/splitting.go

@@ -12,6 +12,7 @@ var log = logging.Logger("chunk")
 var DefaultBlockSize int64 = 1024 * 256
 
 type Splitter interface {
+	Reader() io.Reader
 	NextBytes() ([]byte, error)
 }
 
@@ -77,3 +78,7 @@ func (ss *sizeSplitterv2) NextBytes() ([]byte, error) {
 
 	return buf[:n], nil
 }
+
+func (ss *sizeSplitterv2) Reader() io.Reader {
+	return ss.r
+}

importer/helpers/dagbuilder.go

 package helpers
 
 import (
+	"io"
+	"os"
+
+	"github.com/ipfs/go-ipfs/commands/files"
 	"github.com/ipfs/go-ipfs/importer/chunk"
 	dag "github.com/ipfs/go-ipfs/merkledag"
 
@@ -17,6 +21,8 @@ type DagBuilderHelper struct {
 	nextData  []byte // the next item to return.
 	maxlinks  int
 	batch     *dag.Batch
+	fullPath  string
+	stat      os.FileInfo
 }
 
 type DagBuilderParams struct {
@@ -34,13 +40,18 @@ type DagBuilderParams struct {
 // Generate a new DagBuilderHelper from the given params, which data source comes
 // from chunks object
 func (dbp *DagBuilderParams) New(spl chunk.Splitter) *DagBuilderHelper {
-	return &DagBuilderHelper{
+	db := &DagBuilderHelper{
 		dserv:     dbp.Dagserv,
 		spl:       spl,
 		rawLeaves: dbp.RawLeaves,
 		maxlinks:  dbp.Maxlinks,
 		batch:     dbp.Dagserv.Batch(),
 	}
+	if fi, ok := spl.Reader().(files.FileInfo); ok {
+		db.fullPath = fi.FullPath()
+		db.stat = fi.Stat()
+	}
+	return db
 }
 
 // prepareNext consumes the next item from the splitter and puts it
@@ -48,12 +59,14 @@ func (dbp *DagBuilderParams) New(spl chunk.Splitter) *DagBuilderHelper {
 // it will do nothing.
 func (db *DagBuilderHelper) prepareNext() {
 	// if we already have data waiting to be consumed, we're ready
-	if db.nextData != nil {
+	if db.nextData != nil || db.recvdErr != nil {
 		return
 	}
 
-	// TODO: handle err (which wasn't handled either when the splitter was channeled)
-	db.nextData, _ = db.spl.NextBytes()
+	db.nextData, db.recvdErr = db.spl.NextBytes()
+	if db.recvdErr == io.EOF {
+		db.recvdErr = nil
+	}
 }
 
 // Done returns whether or not we're done consuming the incoming data.
@@ -61,17 +74,24 @@ func (db *DagBuilderHelper) Done() bool {
 	// ensure we have an accurate perspective on data
 	// as `done` this may be called before `next`.
 	db.prepareNext() // idempotent
+	if db.recvdErr != nil {
+		return false
+	}
 	return db.nextData == nil
 }
 
 // Next returns the next chunk of data to be inserted into the dag
 // if it returns nil, that signifies that the stream is at an end, and
 // that the current building operation should finish
-func (db *DagBuilderHelper) Next() []byte {
+func (db *DagBuilderHelper) Next() ([]byte, error) {
 	db.prepareNext() // idempotent
 	d := db.nextData
 	db.nextData = nil // signal we've consumed it
-	return d
+	if db.recvdErr != nil {
+		return nil, db.recvdErr
+	} else {
+		return d, nil
+	}
 }
 
 // GetDagServ returns the dagservice object this Helper is using
@@ -100,7 +120,11 @@ func (db *DagBuilderHelper) FillNodeLayer(node *UnixfsNode) error {
 }
 
 func (db *DagBuilderHelper) GetNextDataNode() (*UnixfsNode, error) {
-	data := db.Next()
+	data, err := db.Next()
+	if err != nil {
+		return nil, err
+	}
+
 	if data == nil { // we're done!
 		return nil, nil
 	}
@@ -121,6 +145,12 @@ func (db *DagBuilderHelper) GetNextDataNode() (*UnixfsNode, error) {
 	}
 }
 
+func (db *DagBuilderHelper) SetPosInfo(node *UnixfsNode, offset uint64) {
+	if db.stat != nil {
+		node.SetPosInfo(offset, db.fullPath, db.stat)
+	}
+}
+
 func (db *DagBuilderHelper) Add(node *UnixfsNode) (node.Node, error) {
 	dn, err := node.GetDagNode()
 	if err != nil {

importer/helpers/helpers.go

@@ -3,9 +3,11 @@ package helpers
 import (
 	"context"
 	"fmt"
+	"os"
 
 	chunk "github.com/ipfs/go-ipfs/importer/chunk"
 	dag "github.com/ipfs/go-ipfs/merkledag"
+	pi "github.com/ipfs/go-ipfs/thirdparty/posinfo"
 	ft "github.com/ipfs/go-ipfs/unixfs"
 
 	node "gx/ipfs/QmZx42H5khbVQhV5odp66TApShV4XCujYazcvYduZ4TroB/go-ipld-node"
@@ -43,6 +45,7 @@ type UnixfsNode struct {
 	rawnode *dag.RawNode
 	node    *dag.ProtoNode
 	ufmt    *ft.FSNode
+	posInfo *pi.PosInfo
 }
 
 // NewUnixfsNode creates a new Unixfs node to represent a file
@@ -144,9 +147,29 @@ func (n *UnixfsNode) FileSize() uint64 {
 	return n.ufmt.FileSize()
 }
 
+func (n *UnixfsNode) SetPosInfo(offset uint64, fullPath string, stat os.FileInfo) {
+	n.posInfo = &pi.PosInfo{offset, fullPath, stat}
+}
+
 // getDagNode fills out the proper formatting for the unixfs node
 // inside of a DAG node and returns the dag node
 func (n *UnixfsNode) GetDagNode() (node.Node, error) {
+	nd, err := n.getBaseDagNode()
+	if err != nil {
+		return nil, err
+	}
+
+	if n.posInfo != nil {
+		return &pi.FilestoreNode{
+			Node:    nd,
+			PosInfo: n.posInfo,
+		}, nil
+	}
+
+	return nd, nil
+}
+
+func (n *UnixfsNode) getBaseDagNode() (node.Node, error) {
 	if n.raw {
 		return n.rawnode, nil
 	}

thirdparty/posinfo/posinfo.go

+package posinfo
+
+import (
+	"os"
+
+	node "gx/ipfs/QmZx42H5khbVQhV5odp66TApShV4XCujYazcvYduZ4TroB/go-ipld-node"
+)
+
+type PosInfo struct {
+	Offset   uint64
+	FullPath string
+	Stat     os.FileInfo // can be nil
+}
+
+type FilestoreNode struct {
+	node.Node
+	PosInfo *PosInfo
+}