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file.go
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file.go
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package physical
import (
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"sync"
log "github.com/mgutz/logxi/v1"
"github.com/hashicorp/vault/helper/jsonutil"
)
// FileBackend is a physical backend that stores data on disk
// at a given file path. It can be used for durable single server
// situations, or to develop locally where durability is not critical.
//
// WARNING: the file backend implementation is currently extremely unsafe
// and non-performant. It is meant mostly for local testing and development.
// It can be improved in the future.
type FileBackend struct {
Path string
l sync.Mutex
logger log.Logger
}
// newFileBackend constructs a Filebackend using the given directory
func newFileBackend(conf map[string]string, logger log.Logger) (Backend, error) {
path, ok := conf["path"]
if !ok {
return nil, fmt.Errorf("'path' must be set")
}
return &FileBackend{
Path: path,
logger: logger,
}, nil
}
func (b *FileBackend) Delete(path string) error {
if path == "" {
return nil
}
b.l.Lock()
defer b.l.Unlock()
basePath, key := b.path(path)
fullPath := filepath.Join(basePath, key)
err := os.Remove(fullPath)
if err != nil && !os.IsNotExist(err) {
return fmt.Errorf("Failed to remove %q: %v", fullPath, err)
}
err = b.cleanupLogicalPath(path)
return err
}
// cleanupLogicalPath is used to remove all empty nodes, begining with deepest
// one, aborting on first non-empty one, up to top-level node.
func (b *FileBackend) cleanupLogicalPath(path string) error {
nodes := strings.Split(path, fmt.Sprintf("%c", os.PathSeparator))
for i := len(nodes) - 1; i > 0; i-- {
fullPath := filepath.Join(b.Path, filepath.Join(nodes[:i]...))
dir, err := os.Open(fullPath)
if err != nil {
if os.IsNotExist(err) {
return nil
} else {
return err
}
}
list, err := dir.Readdir(1)
dir.Close()
if err != nil && err != io.EOF {
return err
}
// If we have no entries, it's an empty directory; remove it
if err == io.EOF || list == nil || len(list) == 0 {
err = os.Remove(fullPath)
if err != nil {
return err
}
}
}
return nil
}
func (b *FileBackend) Get(k string) (*Entry, error) {
b.l.Lock()
defer b.l.Unlock()
path, key := b.path(k)
path = filepath.Join(path, key)
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
defer f.Close()
var entry Entry
if err := jsonutil.DecodeJSONFromReader(f, &entry); err != nil {
return nil, err
}
return &entry, nil
}
func (b *FileBackend) Put(entry *Entry) error {
path, key := b.path(entry.Key)
b.l.Lock()
defer b.l.Unlock()
// Make the parent tree
if err := os.MkdirAll(path, 0755); err != nil {
return err
}
// JSON encode the entry and write it
f, err := os.OpenFile(
filepath.Join(path, key),
os.O_CREATE|os.O_TRUNC|os.O_WRONLY,
0600)
if err != nil {
return err
}
defer f.Close()
enc := json.NewEncoder(f)
return enc.Encode(entry)
}
func (b *FileBackend) List(prefix string) ([]string, error) {
b.l.Lock()
defer b.l.Unlock()
path := b.Path
if prefix != "" {
path = filepath.Join(path, prefix)
}
// Read the directory contents
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
defer f.Close()
names, err := f.Readdirnames(-1)
if err != nil {
return nil, err
}
for i, name := range names {
if name[0] == '_' {
names[i] = name[1:]
} else {
names[i] = name + "/"
}
}
return names, nil
}
func (b *FileBackend) path(k string) (string, string) {
path := filepath.Join(b.Path, k)
key := filepath.Base(path)
path = filepath.Dir(path)
return path, "_" + key
}