127 lines
2.5 KiB
Go
127 lines
2.5 KiB
Go
package store
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import (
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"io/ioutil"
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"os"
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"path"
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"github.com/lbryio/lbry.go/extras/errors"
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)
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// DiskBlobStore stores blobs on a local disk
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type DiskBlobStore struct {
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// the location of blobs on disk
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blobDir string
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// store files in subdirectories based on the first N chars in the filename. 0 = don't create subdirectories.
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prefixLength int
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initialized bool
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}
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// NewDiskBlobStore returns an initialized file disk store pointer.
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func NewDiskBlobStore(dir string, prefixLength int) *DiskBlobStore {
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return &DiskBlobStore{blobDir: dir, prefixLength: prefixLength}
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}
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func (f *DiskBlobStore) dir(hash string) string {
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if f.prefixLength <= 0 || len(hash) < f.prefixLength {
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return f.blobDir
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}
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return path.Join(f.blobDir, hash[:f.prefixLength])
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}
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func (f *DiskBlobStore) path(hash string) string {
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return path.Join(f.dir(hash), hash)
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}
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func (f *DiskBlobStore) ensureDirExists(dir string) error {
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return errors.Err(os.MkdirAll(dir, 0755))
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}
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func (f *DiskBlobStore) initOnce() error {
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if f.initialized {
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return nil
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}
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err := f.ensureDirExists(f.blobDir)
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if err != nil {
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return err
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}
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f.initialized = true
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return nil
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}
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// Has returns T/F or Error if it the blob stored already. It will error with any IO disk error.
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func (f *DiskBlobStore) Has(hash string) (bool, error) {
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err := f.initOnce()
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if err != nil {
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return false, err
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}
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_, err = os.Stat(f.path(hash))
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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// Get returns the byte slice of the blob stored or will error if the blob doesn't exist.
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func (f *DiskBlobStore) Get(hash string) ([]byte, error) {
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err := f.initOnce()
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if err != nil {
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return nil, err
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}
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file, err := os.Open(f.path(hash))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, errors.Err(ErrBlobNotFound)
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}
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return nil, err
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}
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return ioutil.ReadAll(file)
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}
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// Put stores the blob on disk
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func (f *DiskBlobStore) Put(hash string, blob []byte) error {
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err := f.initOnce()
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if err != nil {
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return err
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}
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err = f.ensureDirExists(f.dir(hash))
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if err != nil {
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return err
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}
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return ioutil.WriteFile(f.path(hash), blob, 0644)
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}
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// PutSD stores the sd blob on the disk
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func (f *DiskBlobStore) PutSD(hash string, blob []byte) error {
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return f.Put(hash, blob)
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}
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// Delete deletes the blob from the store
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func (f *DiskBlobStore) Delete(hash string) error {
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err := f.initOnce()
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if err != nil {
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return err
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}
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has, err := f.Has(hash)
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if err != nil {
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return err
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}
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if !has {
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return nil
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}
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return os.Remove(f.path(hash))
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}
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