mem.File is now mem.FileData and mem.File is a file handle with a pointer to a mem.FileData

This commit is contained in:
Martin Bertschler 2016-01-03 23:59:42 +01:00
parent 7b991cb257
commit 7096d68458
5 changed files with 144 additions and 131 deletions

View File

@ -16,22 +16,22 @@ package mem
type Dir interface {
Len() int
Names() []string
Files() []File
Add(File)
Remove(File)
Files() []*File
Add(*File)
Remove(*File)
}
func RemoveFromMemDir(dir *File, f *File) {
dir.memDir.Remove(*f)
dir.fileData.memDir.Remove(f)
}
func AddToMemDir(dir *File, f *File) {
dir.memDir.Add(*f)
dir.fileData.memDir.Add(f)
}
func InitializeDir(d *File) {
if d.memDir == nil {
d.dir = true
d.memDir = &DirMap{}
if d.fileData.memDir == nil {
d.fileData.dir = true
d.fileData.memDir = &DirMap{}
}
}

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@ -15,25 +15,25 @@ package mem
import "sort"
type DirMap map[string]File
type DirMap map[string]*FileData
func (m DirMap) Len() int { return len(m) }
func (m DirMap) Add(f File) { m[f.Name()] = f }
func (m DirMap) Remove(f File) { delete(m, f.Name()) }
func (m DirMap) Files() (files []File) {
func (m DirMap) Len() int { return len(m) }
func (m DirMap) Add(f *File) { m[f.fileData.name] = f.fileData }
func (m DirMap) Remove(f *File) { delete(m, f.fileData.name) }
func (m DirMap) Files() (files []*File) {
for _, f := range m {
files = append(files, f)
files = append(files, NewFileHandle(f))
}
sort.Sort(filesSorter(files))
return files
}
type filesSorter []File
type filesSorter []*File
// implement sort.Interface for []File
func (s filesSorter) Len() int { return len(s) }
func (s filesSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s filesSorter) Less(i, j int) bool { return s[i].Name() < s[j].Name() }
func (s filesSorter) Less(i, j int) bool { return s[i].fileData.name < s[j].fileData.name }
func (m DirMap) Names() (names []string) {
for x := range m {

View File

@ -32,63 +32,74 @@ type File struct {
// atomic requires 64-bit alignment for struct field access
at int64
readDirCount int64
closed bool
fileData *FileData
}
func NewFileHandle(data *FileData) *File {
return &File{fileData: data}
}
func (f File) Data() *FileData {
return f.fileData
}
type FileData struct {
sync.Mutex
name string
data []byte
memDir Dir
dir bool
closed bool
mode os.FileMode
modtime time.Time
}
func CreateFile(name string) *File {
return &File{name: name, mode: os.ModeTemporary, modtime: time.Now()}
func CreateFile(name string) *FileData {
return &FileData{name: name, mode: os.ModeTemporary, modtime: time.Now()}
}
func CreateDir(name string) *File {
return &File{name: name, memDir: &DirMap{}, dir: true}
func CreateDir(name string) *FileData {
return &FileData{name: name, memDir: &DirMap{}, dir: true}
}
func ChangeFileName(f *File, newname string) {
f.name = newname
f.fileData.name = newname
}
func SetMode(f *File, mode os.FileMode) {
f.mode = mode
f.fileData.mode = mode
}
func SetModTime(f *File, mtime time.Time) {
f.modtime = mtime
f.fileData.modtime = mtime
}
func GetFileInfo(f *File) *FileInfo {
return &FileInfo{file: f}
return &FileInfo{f.fileData}
}
func (f *File) Open() error {
atomic.StoreInt64(&f.at, 0)
atomic.StoreInt64(&f.readDirCount, 0)
f.Lock()
f.fileData.Lock()
f.closed = false
f.Unlock()
f.fileData.Unlock()
return nil
}
func (f *File) Close() error {
f.Lock()
f.fileData.Lock()
f.closed = true
f.Unlock()
f.fileData.Unlock()
return nil
}
func (f *File) Name() string {
return f.name
return f.fileData.name
}
func (f *File) Stat() (os.FileInfo, error) {
return &FileInfo{f}, nil
return &FileInfo{f.fileData}, nil
}
func (f *File) Sync() error {
@ -98,8 +109,8 @@ func (f *File) Sync() error {
func (f *File) Readdir(count int) (res []os.FileInfo, err error) {
var outLength int64
f.Lock()
files := f.memDir.Files()[f.readDirCount:]
f.fileData.Lock()
files := f.fileData.memDir.Files()[f.readDirCount:]
if count > 0 {
if len(files) < count {
outLength = int64(len(files))
@ -113,11 +124,11 @@ func (f *File) Readdir(count int) (res []os.FileInfo, err error) {
outLength = int64(len(files))
}
f.readDirCount += outLength
f.Unlock()
f.fileData.Unlock()
res = make([]os.FileInfo, outLength)
for i := range res {
res[i], _ = files[i].Stat()
res[i] = &FileInfo{files[i].fileData}
}
return res, err
@ -133,20 +144,20 @@ func (f *File) Readdirnames(n int) (names []string, err error) {
}
func (f *File) Read(b []byte) (n int, err error) {
f.Lock()
defer f.Unlock()
f.fileData.Lock()
defer f.fileData.Unlock()
if f.closed == true {
return 0, ErrFileClosed
}
if len(b) > 0 && int(f.at) == len(f.data) {
if len(b) > 0 && int(f.at) == len(f.fileData.data) {
return 0, io.EOF
}
if len(f.data)-int(f.at) >= len(b) {
if len(f.fileData.data)-int(f.at) >= len(b) {
n = len(b)
} else {
n = len(f.data) - int(f.at)
n = len(f.fileData.data) - int(f.at)
}
copy(b, f.data[f.at:f.at+int64(n)])
copy(b, f.fileData.data[f.at:f.at+int64(n)])
atomic.AddInt64(&f.at, int64(n))
return
}
@ -163,11 +174,11 @@ func (f *File) Truncate(size int64) error {
if size < 0 {
return ErrOutOfRange
}
if size > int64(len(f.data)) {
diff := size - int64(len(f.data))
f.data = append(f.data, bytes.Repeat([]byte{00}, int(diff))...)
if size > int64(len(f.fileData.data)) {
diff := size - int64(len(f.fileData.data))
f.fileData.data = append(f.fileData.data, bytes.Repeat([]byte{00}, int(diff))...)
} else {
f.data = f.data[0:size]
f.fileData.data = f.fileData.data[0:size]
}
return nil
}
@ -182,7 +193,7 @@ func (f *File) Seek(offset int64, whence int) (int64, error) {
case 1:
atomic.AddInt64(&f.at, int64(offset))
case 2:
atomic.StoreInt64(&f.at, int64(len(f.data))+offset)
atomic.StoreInt64(&f.at, int64(len(f.fileData.data))+offset)
}
return f.at, nil
}
@ -190,22 +201,22 @@ func (f *File) Seek(offset int64, whence int) (int64, error) {
func (f *File) Write(b []byte) (n int, err error) {
n = len(b)
cur := atomic.LoadInt64(&f.at)
f.Lock()
defer f.Unlock()
diff := cur - int64(len(f.data))
f.fileData.Lock()
defer f.fileData.Unlock()
diff := cur - int64(len(f.fileData.data))
var tail []byte
if n+int(cur) < len(f.data) {
tail = f.data[n+int(cur):]
if n+int(cur) < len(f.fileData.data) {
tail = f.fileData.data[n+int(cur):]
}
if diff > 0 {
f.data = append(bytes.Repeat([]byte{00}, int(diff)), b...)
f.data = append(f.data, tail...)
f.fileData.data = append(bytes.Repeat([]byte{00}, int(diff)), b...)
f.fileData.data = append(f.fileData.data, tail...)
} else {
f.data = append(f.data[:cur], b...)
f.data = append(f.data, tail...)
f.fileData.data = append(f.fileData.data[:cur], b...)
f.fileData.data = append(f.fileData.data, tail...)
}
atomic.StoreInt64(&f.at, int64(len(f.data)))
atomic.StoreInt64(&f.at, int64(len(f.fileData.data)))
return
}
@ -219,27 +230,27 @@ func (f *File) WriteString(s string) (ret int, err error) {
}
func (f *File) Info() *FileInfo {
return &FileInfo{file: f}
return &FileInfo{f.fileData}
}
type FileInfo struct {
file *File
*FileData
}
// Implements os.FileInfo
func (s *FileInfo) Name() string {
_, name := filepath.Split(s.file.Name())
_, name := filepath.Split(s.name)
return name
}
func (s *FileInfo) Mode() os.FileMode { return s.file.mode }
func (s *FileInfo) ModTime() time.Time { return s.file.modtime }
func (s *FileInfo) IsDir() bool { return s.file.dir }
func (s *FileInfo) Mode() os.FileMode { return s.mode }
func (s *FileInfo) ModTime() time.Time { return s.modtime }
func (s *FileInfo) IsDir() bool { return s.dir }
func (s *FileInfo) Sys() interface{} { return nil }
func (s *FileInfo) Size() int64 {
if s.IsDir() {
return int64(42)
}
return int64(len(s.file.data))
return int64(len(s.data))
}
var (

View File

@ -14,7 +14,6 @@
package afero
import (
"errors"
"fmt"
"log"
"os"
@ -28,15 +27,15 @@ import (
type MemMapFs struct {
mu sync.RWMutex
data map[string]File
data map[string]*mem.FileData
init sync.Once
}
var memfsInit sync.Once
func (m *MemMapFs) getData() map[string]File {
func (m *MemMapFs) getData() map[string]*mem.FileData {
m.init.Do(func() {
m.data = make(map[string]File)
m.data = make(map[string]*mem.FileData)
// Root should always exist, right?
// TODO: what about windows?
m.data[FilePathSeparator] = mem.CreateDir(FilePathSeparator)
@ -51,9 +50,11 @@ func (m *MemMapFs) Create(name string) (File, error) {
m.mu.Lock()
file := mem.CreateFile(name)
m.getData()[name] = file
m.registerWithParent(file)
handle := mem.NewFileHandle(file)
m.registerWithParent(handle)
m.mu.Unlock()
return file, nil
return handle, nil
}
func (m *MemMapFs) unRegisterWithParent(fileName string) error {
@ -65,13 +66,11 @@ func (m *MemMapFs) unRegisterWithParent(fileName string) error {
if parent == nil {
log.Fatal("parent of ", f.Name(), " is nil")
}
pmem := parent.(*mem.File)
fmem := f.(*mem.File)
mem.RemoveFromMemDir(pmem, fmem)
mem.RemoveFromMemDir(parent, f)
return nil
}
func (m *MemMapFs) findParent(f File) File {
func (m *MemMapFs) findParent(f *mem.File) *mem.File {
pdir, _ := filepath.Split(f.Name())
pdir = filepath.Clean(pdir)
pfile, err := m.lockfreeOpen(pdir)
@ -81,7 +80,7 @@ func (m *MemMapFs) findParent(f File) File {
return pfile
}
func (m *MemMapFs) registerWithParent(f File) {
func (m *MemMapFs) registerWithParent(f *mem.File) {
if f == nil {
return
}
@ -99,15 +98,9 @@ func (m *MemMapFs) registerWithParent(f File) {
return
}
}
pmem := parent.(*mem.File)
fmem := f.(*mem.File)
// TODO(mbertschler): memDir is only nil when it was not made with Mkdir
// or lockfreeMkdir. In this case the parent is also not a real directory.
// This currently only happens for the file ".".
// This is a quick hack to make the library usable with relative paths.
mem.InitializeDir(pmem)
mem.AddToMemDir(pmem, fmem)
mem.InitializeDir(parent)
mem.AddToMemDir(parent, f)
}
func (m *MemMapFs) lockfreeMkdir(name string, perm os.FileMode) error {
@ -115,7 +108,7 @@ func (m *MemMapFs) lockfreeMkdir(name string, perm os.FileMode) error {
x, ok := m.getData()[name]
if ok {
// Only return ErrFileExists if it's a file, not a directory.
i, err := x.Stat()
i, err := mem.NewFileHandle(x).Stat()
if !i.IsDir() {
return ErrFileExists
}
@ -125,7 +118,7 @@ func (m *MemMapFs) lockfreeMkdir(name string, perm os.FileMode) error {
} else {
item := mem.CreateDir(name)
m.getData()[name] = item
m.registerWithParent(item)
m.registerWithParent(mem.NewFileHandle(item))
}
return nil
}
@ -142,7 +135,7 @@ func (m *MemMapFs) Mkdir(name string, perm os.FileMode) error {
m.mu.Lock()
item := mem.CreateDir(name)
m.getData()[name] = item
m.registerWithParent(item)
m.registerWithParent(mem.NewFileHandle(item))
m.mu.Unlock()
}
return nil
@ -179,27 +172,23 @@ func (m *MemMapFs) Open(name string) (File, error) {
m.mu.RLock()
f, ok := m.getData()[name]
ff, ok := f.(*mem.File)
if ok {
ff.Open()
}
m.mu.RUnlock()
if ok {
return f, nil
} else {
if !ok {
return nil, &os.PathError{"open", name, ErrFileNotFound}
}
ff := mem.NewFileHandle(f)
ff.Open()
return ff, nil
}
func (m *MemMapFs) lockfreeOpen(name string) (File, error) {
func (m *MemMapFs) lockfreeOpen(name string) (*mem.File, error) {
name = normalizePath(name)
f, ok := m.getData()[name]
ff, ok := f.(*mem.File)
if ok {
ff.Open()
return f, nil
// TODO (mbertschler)
// not used anymore?
//ff.Open()
return mem.NewFileHandle(f), nil
} else {
return nil, ErrFileNotFound
}
@ -284,10 +273,11 @@ func (m *MemMapFs) Rename(oldname, newname string) error {
m.mu.RUnlock()
m.mu.Lock()
m.unRegisterWithParent(oldname)
file := m.getData()[oldname].(*mem.File)
fileData := m.getData()[oldname]
file := mem.NewFileHandle(fileData)
delete(m.getData(), oldname)
mem.ChangeFileName(file, newname)
m.getData()[newname] = file
m.getData()[newname] = fileData
m.registerWithParent(file)
m.mu.Unlock()
m.mu.RLock()
@ -316,14 +306,11 @@ func (m *MemMapFs) Chmod(name string, mode os.FileMode) error {
return &os.PathError{"chmod", name, ErrFileNotFound}
}
ff, ok := f.(*mem.File)
if ok {
m.mu.Lock()
mem.SetMode(ff, mode)
m.mu.Unlock()
} else {
return errors.New("Unable to Chmod Memory File")
}
ff := mem.NewFileHandle(f)
m.mu.Lock()
mem.SetMode(ff, mode)
m.mu.Unlock()
return nil
}
@ -334,21 +321,19 @@ func (m *MemMapFs) Chtimes(name string, atime time.Time, mtime time.Time) error
return &os.PathError{"chtimes", name, ErrFileNotFound}
}
ff, ok := f.(*mem.File)
if ok {
m.mu.Lock()
mem.SetModTime(ff, mtime)
m.mu.Unlock()
} else {
return errors.New("Unable to Chtime Memory File")
}
ff := mem.NewFileHandle(f)
m.mu.Lock()
mem.SetModTime(ff, mtime)
m.mu.Unlock()
return nil
}
func (m *MemMapFs) List() {
for _, x := range m.data {
y, _ := x.Stat()
fmt.Println(x.Name(), y.Size())
f := mem.NewFileHandle(x)
y, _ := f.Stat()
fmt.Println(f.Name(), y.Size())
}
}

View File

@ -106,10 +106,9 @@ func TestMultipleOpenFiles(t *testing.T) {
defer removeAllTestFiles(t)
const fileName = "./afero-demo2.txt"
var fss = []Fs{&OsFs{}, &MemMapFs{}}
var data = make([][]byte, len(fss))
var data = make([][]byte, len(Fss))
for i, fs := range fss {
for i, fs := range Fss {
dir := testDir(fs)
path := filepath.Join(dir, fileName)
fh1, err := fs.Create(path)
@ -120,18 +119,36 @@ func TestMultipleOpenFiles(t *testing.T) {
if err != nil {
t.Error("fh.Write failed: " + err.Error())
}
fh1.Seek(0, os.SEEK_SET)
_, err = fh1.Seek(0, os.SEEK_SET)
if err != nil {
t.Error(err)
}
fh2, err := fs.OpenFile(path, os.O_RDWR, 0777)
if err != nil {
t.Error("fs.OpenFile failed: " + err.Error())
}
fh2.Seek(0, os.SEEK_END)
fh2.Write([]byte("data"))
fh2.Close()
_, err = fh2.Seek(0, os.SEEK_END)
if err != nil {
t.Error(err)
}
_, err = fh2.Write([]byte("data"))
if err != nil {
t.Error(err)
}
err = fh2.Close()
if err != nil {
t.Error(err)
}
fh1.Write([]byte("data"))
fh1.Close()
_, err = fh1.Write([]byte("data"))
if err != nil {
t.Error(err)
}
err = fh1.Close()
if err != nil {
t.Error(err)
}
// the file now should contain "datadata"
data[i], err = ReadFile(fs, path)
if err != nil {
@ -139,14 +156,14 @@ func TestMultipleOpenFiles(t *testing.T) {
}
}
for i, fs := range fss {
for i, fs := range Fss {
if i == 0 {
continue
}
if string(data[0]) != string(data[i]) {
t.Errorf("OsFs and %s don't behave the same\n"+
"OsFs: \"%s\"\n%s: \"%s\"\n",
fs.Name(), data[0], fs.Name(), data[i])
t.Errorf("%s and %s don't behave the same\n"+
"%s: \"%s\"\n%s: \"%s\"\n",
Fss[0].Name(), fs.Name(), Fss[0].Name(), data[0], fs.Name(), data[i])
}
}
}