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fs.go
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fs.go
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package fs
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
ds "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore"
query "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore/query"
)
var ObjectKeySuffix = ".dsobject"
// Datastore uses a standard Go map for internal storage.
type Datastore struct {
path string
}
// NewDatastore returns a new fs Datastore at given `path`
func NewDatastore(path string) (ds.Datastore, error) {
if !isDir(path) {
return nil, fmt.Errorf("Failed to find directory at: %v (file? perms?)", path)
}
return &Datastore{path: path}, nil
}
// KeyFilename returns the filename associated with `key`
func (d *Datastore) KeyFilename(key ds.Key) string {
return filepath.Join(d.path, key.String(), ObjectKeySuffix)
}
// Put stores the given value.
func (d *Datastore) Put(key ds.Key, value interface{}) (err error) {
// TODO: maybe use io.Readers/Writers?
// r, err := dsio.CastAsReader(value)
// if err != nil {
// return err
// }
val, ok := value.([]byte)
if !ok {
return ds.ErrInvalidType
}
fn := d.KeyFilename(key)
// mkdirall above.
err = os.MkdirAll(filepath.Dir(fn), 0755)
if err != nil {
return err
}
return ioutil.WriteFile(fn, val, 0666)
}
// Get returns the value for given key
func (d *Datastore) Get(key ds.Key) (value interface{}, err error) {
fn := d.KeyFilename(key)
if !isFile(fn) {
return nil, ds.ErrNotFound
}
return ioutil.ReadFile(fn)
}
// Has returns whether the datastore has a value for a given key
func (d *Datastore) Has(key ds.Key) (exists bool, err error) {
return ds.GetBackedHas(d, key)
}
// Delete removes the value for given key
func (d *Datastore) Delete(key ds.Key) (err error) {
fn := d.KeyFilename(key)
if !isFile(fn) {
return ds.ErrNotFound
}
return os.Remove(fn)
}
// Query implements Datastore.Query
func (d *Datastore) Query(q query.Query) (query.Results, error) {
results := make(chan query.Result)
walkFn := func(path string, info os.FileInfo, err error) error {
// remove ds path prefix
if strings.HasPrefix(path, d.path) {
path = path[len(d.path):]
}
if !info.IsDir() {
if strings.HasSuffix(path, ObjectKeySuffix) {
path = path[:len(path)-len(ObjectKeySuffix)]
}
key := ds.NewKey(path)
entry := query.Entry{Key: key.String(), Value: query.NotFetched}
results <- query.Result{Entry: entry}
}
return nil
}
go func() {
filepath.Walk(d.path, walkFn)
close(results)
}()
r := query.ResultsWithChan(q, results)
r = query.NaiveQueryApply(q, r)
return r, nil
}
// isDir returns whether given path is a directory
func isDir(path string) bool {
finfo, err := os.Stat(path)
if err != nil {
return false
}
return finfo.IsDir()
}
// isFile returns whether given path is a file
func isFile(path string) bool {
finfo, err := os.Stat(path)
if err != nil {
return false
}
return !finfo.IsDir()
}