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util.go
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util.go
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package filestore
import (
"context"
"fmt"
"sort"
pb "github.com/ipfs/go-filestore/pb"
cid "github.com/ipfs/go-cid"
ds "github.com/ipfs/go-datastore"
dsq "github.com/ipfs/go-datastore/query"
dshelp "github.com/ipfs/go-ipfs-ds-help"
ipld "github.com/ipfs/go-ipld-format"
mh "github.com/multiformats/go-multihash"
)
// Status is used to identify the state of the block data referenced
// by a FilestoreNode. Among other places, it is used by CorruptReferenceError.
type Status int32
// These are the supported Status codes.
const (
StatusOk Status = 0
StatusFileError Status = 10 // Backing File Error
StatusFileNotFound Status = 11 // Backing File Not Found
StatusFileChanged Status = 12 // Contents of the file changed
StatusOtherError Status = 20 // Internal Error, likely corrupt entry
StatusKeyNotFound Status = 30
)
// String provides a human-readable representation for Status codes.
func (s Status) String() string {
switch s {
case StatusOk:
return "ok"
case StatusFileError:
return "error"
case StatusFileNotFound:
return "no-file"
case StatusFileChanged:
return "changed"
case StatusOtherError:
return "ERROR"
case StatusKeyNotFound:
return "missing"
default:
return "???"
}
}
// Format returns the status formatted as a string
// with leading 0s.
func (s Status) Format() string {
return fmt.Sprintf("%-7s", s.String())
}
// ListRes wraps the response of the List*() functions, which
// allows to obtain and verify blocks stored by the FileManager
// of a Filestore. It includes information about the referenced
// block.
type ListRes struct {
Status Status
ErrorMsg string
Key cid.Cid
FilePath string
Offset uint64
Size uint64
}
// FormatLong returns a human readable string for a ListRes object
func (r *ListRes) FormatLong(enc func(cid.Cid) string) string {
if enc == nil {
enc = (cid.Cid).String
}
switch {
case !r.Key.Defined():
return "<corrupt key>"
case r.FilePath == "":
return r.Key.String()
default:
return fmt.Sprintf("%-50s %6d %s %d", enc(r.Key), r.Size, r.FilePath, r.Offset)
}
}
// List fetches the block with the given key from the Filemanager
// of the given Filestore and returns a ListRes object with the information.
// List does not verify that the reference is valid or whether the
// raw data is accesible. See Verify().
func List(ctx context.Context, fs *Filestore, key cid.Cid) *ListRes {
return list(ctx, fs, false, key.Hash())
}
// ListAll returns a function as an iterator which, once invoked, returns
// one by one each block in the Filestore's FileManager.
// ListAll does not verify that the references are valid or whether
// the raw data is accessible. See VerifyAll().
func ListAll(ctx context.Context, fs *Filestore, fileOrder bool) (func(context.Context) *ListRes, error) {
if fileOrder {
return listAllFileOrder(ctx, fs, false)
}
return listAll(ctx, fs, false)
}
// Verify fetches the block with the given key from the Filemanager
// of the given Filestore and returns a ListRes object with the information.
// Verify makes sure that the reference is valid and the block data can be
// read.
func Verify(ctx context.Context, fs *Filestore, key cid.Cid) *ListRes {
return list(ctx, fs, true, key.Hash())
}
// VerifyAll returns a function as an iterator which, once invoked,
// returns one by one each block in the Filestore's FileManager.
// VerifyAll checks that the reference is valid and that the block data
// can be read.
func VerifyAll(ctx context.Context, fs *Filestore, fileOrder bool) (func(context.Context) *ListRes, error) {
if fileOrder {
return listAllFileOrder(ctx, fs, true)
}
return listAll(ctx, fs, true)
}
func list(ctx context.Context, fs *Filestore, verify bool, key mh.Multihash) *ListRes {
dobj, err := fs.fm.getDataObj(ctx, key)
if err != nil {
return mkListRes(key, nil, err)
}
if verify {
_, err = fs.fm.readDataObj(ctx, key, dobj)
}
return mkListRes(key, dobj, err)
}
func listAll(ctx context.Context, fs *Filestore, verify bool) (func(context.Context) *ListRes, error) {
q := dsq.Query{}
qr, err := fs.fm.ds.Query(ctx, q)
if err != nil {
return nil, err
}
return func(ctx context.Context) *ListRes {
mhash, dobj, err := next(qr)
if dobj == nil && err == nil {
return nil
} else if err == nil && verify {
_, err = fs.fm.readDataObj(ctx, mhash, dobj)
}
return mkListRes(mhash, dobj, err)
}, nil
}
func next(qr dsq.Results) (mh.Multihash, *pb.DataObj, error) {
v, ok := qr.NextSync()
if !ok {
return nil, nil, nil
}
k := ds.RawKey(v.Key)
mhash, err := dshelp.DsKeyToMultihash(k)
if err != nil {
return nil, nil, fmt.Errorf("decoding multihash from filestore: %s", err)
}
dobj, err := unmarshalDataObj(v.Value)
if err != nil {
return mhash, nil, err
}
return mhash, dobj, nil
}
func listAllFileOrder(ctx context.Context, fs *Filestore, verify bool) (func(context.Context) *ListRes, error) {
q := dsq.Query{}
qr, err := fs.fm.ds.Query(ctx, q)
if err != nil {
return nil, err
}
var entries listEntries
for {
v, ok := qr.NextSync()
if !ok {
break
}
dobj, err := unmarshalDataObj(v.Value)
if err != nil {
entries = append(entries, &listEntry{
dsKey: v.Key,
err: err,
})
} else {
entries = append(entries, &listEntry{
dsKey: v.Key,
filePath: dobj.GetFilePath(),
offset: dobj.GetOffset(),
size: dobj.GetSize_(),
})
}
}
sort.Sort(entries)
i := 0
return func(ctx context.Context) *ListRes {
if i >= len(entries) {
return nil
}
v := entries[i]
i++
// attempt to convert the datastore key to a Multihash,
// store the error but don't use it yet
mhash, keyErr := dshelp.DsKeyToMultihash(ds.RawKey(v.dsKey))
// first if they listRes already had an error return that error
if v.err != nil {
return mkListRes(mhash, nil, v.err)
}
// now reconstruct the DataObj
dobj := pb.DataObj{
FilePath: v.filePath,
Offset: v.offset,
Size_: v.size,
}
// now if we could not convert the datastore key return that
// error
if keyErr != nil {
return mkListRes(mhash, &dobj, keyErr)
}
// finally verify the dataobj if requested
var err error
if verify {
_, err = fs.fm.readDataObj(ctx, mhash, &dobj)
}
return mkListRes(mhash, &dobj, err)
}, nil
}
type listEntry struct {
filePath string
offset uint64
dsKey string
size uint64
err error
}
type listEntries []*listEntry
func (l listEntries) Len() int { return len(l) }
func (l listEntries) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
func (l listEntries) Less(i, j int) bool {
if l[i].filePath == l[j].filePath {
if l[i].offset == l[j].offset {
return l[i].dsKey < l[j].dsKey
}
return l[i].offset < l[j].offset
}
return l[i].filePath < l[j].filePath
}
func mkListRes(m mh.Multihash, d *pb.DataObj, err error) *ListRes {
status := StatusOk
errorMsg := ""
if err != nil {
if err == ds.ErrNotFound || ipld.IsNotFound(err) {
status = StatusKeyNotFound
} else if err, ok := err.(*CorruptReferenceError); ok {
status = err.Code
} else {
status = StatusOtherError
}
errorMsg = err.Error()
}
c := cid.NewCidV1(cid.Raw, m)
if d == nil {
return &ListRes{
Status: status,
ErrorMsg: errorMsg,
Key: c,
}
}
return &ListRes{
Status: status,
ErrorMsg: errorMsg,
Key: c,
FilePath: d.FilePath,
Size: d.Size_,
Offset: d.Offset,
}
}