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filestore.go
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filestore.go
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// Package filestore implements a Blockstore which is able to read certain
// blocks of data directly from its original location in the filesystem.
//
// In a Filestore, object leaves are stored as FilestoreNodes. FilestoreNodes
// include a filesystem path and an offset, allowing a Blockstore dealing with
// such blocks to avoid storing the whole contents and reading them from their
// filesystem location instead.
package filestore
import (
"context"
"errors"
cid "gx/ipfs/QmPSQnBKM9g7BaUcZCvswUJVscQ1ipjmwxN5PXCjkp9EQ7/go-cid"
posinfo "gx/ipfs/QmQyUyYcpKG1u53V7N25qRTGw5XwaAxTMKXbduqHotQztg/go-ipfs-posinfo"
blocks "gx/ipfs/QmRcHuYzAyswytBuMF78rj3LTChYszomRFXNg4685ZN1WM/go-block-format"
logging "gx/ipfs/QmZChCsSt8DctjceaL56Eibc29CVQq4dGKRXC5JRZ6Ppae/go-log"
dsq "gx/ipfs/QmaRb5yNXKonhbkpNxNawoydk4N6es6b4fPj19sjEKsh5D/go-datastore/query"
blockstore "gx/ipfs/QmcDDgAXDbpDUpadCJKLr49KYR4HuL7T8Z1dZTHt6ixsoR/go-ipfs-blockstore"
)
var log = logging.Logger("filestore")
var ErrFilestoreNotEnabled = errors.New("filestore is not enabled, see https://git.io/vNItf")
var ErrUrlstoreNotEnabled = errors.New("urlstore is not enabled")
// Filestore implements a Blockstore by combining a standard Blockstore
// to store regular blocks and a special Blockstore called
// FileManager to store blocks which data exists in an external file.
type Filestore struct {
fm *FileManager
bs blockstore.Blockstore
}
// FileManager returns the FileManager in Filestore.
func (f *Filestore) FileManager() *FileManager {
return f.fm
}
// MainBlockstore returns the standard Blockstore in the Filestore.
func (f *Filestore) MainBlockstore() blockstore.Blockstore {
return f.bs
}
// NewFilestore creates one using the given Blockstore and FileManager.
func NewFilestore(bs blockstore.Blockstore, fm *FileManager) *Filestore {
return &Filestore{fm, bs}
}
// AllKeysChan returns a channel from which to read the keys stored in
// the blockstore. If the given context is cancelled the channel will be closed.
func (f *Filestore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
ctx, cancel := context.WithCancel(ctx)
a, err := f.bs.AllKeysChan(ctx)
if err != nil {
cancel()
return nil, err
}
out := make(chan cid.Cid, dsq.KeysOnlyBufSize)
go func() {
defer cancel()
defer close(out)
var done bool
for !done {
select {
case c, ok := <-a:
if !ok {
done = true
continue
}
select {
case out <- c:
case <-ctx.Done():
return
}
case <-ctx.Done():
return
}
}
// Can't do these at the same time because the abstractions around
// leveldb make us query leveldb for both operations. We apparently
// cant query leveldb concurrently
b, err := f.fm.AllKeysChan(ctx)
if err != nil {
log.Error("error querying filestore: ", err)
return
}
done = false
for !done {
select {
case c, ok := <-b:
if !ok {
done = true
continue
}
select {
case out <- c:
case <-ctx.Done():
return
}
case <-ctx.Done():
return
}
}
}()
return out, nil
}
// DeleteBlock deletes the block with the given key from the
// blockstore. As expected, in the case of FileManager blocks, only the
// reference is deleted, not its contents. It may return
// ErrNotFound when the block is not stored.
func (f *Filestore) DeleteBlock(c cid.Cid) error {
err1 := f.bs.DeleteBlock(c)
if err1 != nil && err1 != blockstore.ErrNotFound {
return err1
}
err2 := f.fm.DeleteBlock(c)
// if we successfully removed something from the blockstore, but the
// filestore didnt have it, return success
switch err2 {
case nil:
return nil
case blockstore.ErrNotFound:
if err1 == blockstore.ErrNotFound {
return blockstore.ErrNotFound
}
return nil
default:
return err2
}
}
// Get retrieves the block with the given Cid. It may return
// ErrNotFound when the block is not stored.
func (f *Filestore) Get(c cid.Cid) (blocks.Block, error) {
blk, err := f.bs.Get(c)
switch err {
case nil:
return blk, nil
case blockstore.ErrNotFound:
return f.fm.Get(c)
default:
return nil, err
}
}
// GetSize returns the size of the requested block. It may return ErrNotFound
// when the block is not stored.
func (f *Filestore) GetSize(c cid.Cid) (int, error) {
size, err := f.bs.GetSize(c)
switch err {
case nil:
return size, nil
case blockstore.ErrNotFound:
return f.fm.GetSize(c)
default:
return -1, err
}
}
// Has returns true if the block with the given Cid is
// stored in the Filestore.
func (f *Filestore) Has(c cid.Cid) (bool, error) {
has, err := f.bs.Has(c)
if err != nil {
return false, err
}
if has {
return true, nil
}
return f.fm.Has(c)
}
// Put stores a block in the Filestore. For blocks of
// underlying type FilestoreNode, the operation is
// delegated to the FileManager, while the rest of blocks
// are handled by the regular blockstore.
func (f *Filestore) Put(b blocks.Block) error {
has, err := f.Has(b.Cid())
if err != nil {
return err
}
if has {
return nil
}
switch b := b.(type) {
case *posinfo.FilestoreNode:
return f.fm.Put(b)
default:
return f.bs.Put(b)
}
}
// PutMany is like Put(), but takes a slice of blocks, allowing
// the underlying blockstore to perform batch transactions.
func (f *Filestore) PutMany(bs []blocks.Block) error {
var normals []blocks.Block
var fstores []*posinfo.FilestoreNode
for _, b := range bs {
has, err := f.Has(b.Cid())
if err != nil {
return err
}
if has {
continue
}
switch b := b.(type) {
case *posinfo.FilestoreNode:
fstores = append(fstores, b)
default:
normals = append(normals, b)
}
}
if len(normals) > 0 {
err := f.bs.PutMany(normals)
if err != nil {
return err
}
}
if len(fstores) > 0 {
err := f.fm.PutMany(fstores)
if err != nil {
return err
}
}
return nil
}
// HashOnRead calls blockstore.HashOnRead.
func (f *Filestore) HashOnRead(enabled bool) {
f.bs.HashOnRead(enabled)
}
var _ blockstore.Blockstore = (*Filestore)(nil)