jsfs

package
v0.1.0 Latest Latest
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 Go to latest Published: Apr 14, 2024 License: BSD-3-Clause Imports: 21 Imported by: 0

README

jsfs

Package jsfs provides a Node.js style filesystem API in Go that can be used to allow os functions to work on wasm. It implements all standard Node.js fs functions except for the synchronous versions, as those are not needed by the Go standard library.

It is built on hackpadfs and based on hackpad, which are licensed under the Apache 2.0 License.

Documentation

Rendered for js/wasm

Overview

Package jsfs provides a Node.js style filesystem API in Go that can be used to allow os functions to work on wasm.

Index

Constants

This section is empty.

Variables

View Source 
var (
	FuncTrue = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
		return true
	})
	FuncFalse = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
		return false
	})
)
View Source 
var (
	Stdout hackpadfs.File = &BufferedLogger{Nm: "dev/stdout", PrintFn: func(args ...any) {
		js.Global().Get("console").Call("log", args...)
	}}
	Stderr hackpadfs.File = &BufferedLogger{Nm: "dev/stderr", PrintFn: func(args ...any) {
		js.Global().Get("console").Call("error", args...)
	}}
)
View Source 
var ErrNotDir = WrapError(errors.New("not a directory"), "ENOTDIR")
View Source 
var ModeBitTranslation = map[os.FileMode]uint32{
	os.ModeDir:        syscall.S_IFDIR,
	os.ModeCharDevice: syscall.S_IFCHR,
	os.ModeNamedPipe:  syscall.S_IFIFO,
	os.ModeSymlink:    syscall.S_IFLNK,
	os.ModeSocket:     syscall.S_IFSOCK,
}

Functions

func BlockCount 

func BlockCount(size, blockSize int64) int64

func ErrBadFile 

func ErrBadFile(identifier string) error

func ErrBadFileNumber 

func ErrBadFileNumber(fd uint64) error

func FuncOf 

func FuncOf[F Func](name string, fn F) js.Func

FuncOf turns the given function into a callback js.Func.

func GetErrType 

func GetErrType(err error, debugMessage string) string

GetErrType returns the JS type of the given error.

func JSBoolFunc 

func JSBoolFunc(b bool) js.Func

func JSError 

func JSError(err error, message string, args ...js.Value) js.Value

JsError converts the given error value into a JS error value.

func JSMode 

func JSMode(mode os.FileMode) uint32

func JSStat 

func JSStat(info os.FileInfo) js.Value

func NewNullFile 

func NewNullFile(name string) hackpadfs.File

func NormPath 

func NormPath(p string) string

NormPath normalizes the given path by cleaning it and making it non-rooted, as all go fs paths must be non-rooted.

func SetFunc 

func SetFunc[F Func](v js.Value, name string, fn F)

SetFunc sets the function with the given name on the given value to the given function.

func WrapError 

func WrapError(err error, code string) error

Types

type BufferedLogger 

type BufferedLogger struct {
	Nm        string
	PrintFn   func(args ...any)
	Mu        sync.Mutex
	Buf       bytes.Buffer
	TimerOnce sync.Once
}

func (*BufferedLogger) Close 

func (b *BufferedLogger) Close() error

func (*BufferedLogger) Flush 

func (b *BufferedLogger) Flush()

func (*BufferedLogger) Name 

func (b *BufferedLogger) Name() string

func (*BufferedLogger) Print 

func (b *BufferedLogger) Print(s string) int

func (*BufferedLogger) Read 

func (b *BufferedLogger) Read(p []byte) (n int, err error)

func (*BufferedLogger) Stat 

func (b *BufferedLogger) Stat() (os.FileInfo, error)

func (*BufferedLogger) Write 

func (b *BufferedLogger) Write(p []byte) (n int, err error)

type FS 

type FS struct {
	*mount.FS

	PreviousFID uint64
	Files       map[uint64]hackpadfs.File
	Mu          sync.Mutex
}

FS represents a filesystem that implements the Node.js fs API. It is backed by a mount.FS, and automatically provides /dev/stdin, /dev/stdout, /dev/stderr, and /tmp. It can be configured with a default unix-style home directory backed by a persistent IndexedDB storage mechanism using FS.ConfigUnix.

func Config 

func Config(jfs js.Value) (*FS, error)

Config configures the given JavaScript object to be a filesystem that implements the Node.js fs API. It is the main entry point for code using jsfs. It returns the resulting FS, which should not typically be needed.

func NewFS 

func NewFS() (*FS, error)

NewFS returns a new FS. Most code should use Config instead.

func (*FS) Chmod 

func (f *FS) Chmod(args []js.Value) (any, error)

func (*FS) Chown 

func (f *FS) Chown(args []js.Value) (any, error)

func (*FS) Close 

func (f *FS) Close(args []js.Value) (any, error)

func (*FS) ConfigUnix 

func (f *FS) ConfigUnix() error

ConfigUnix configures a standard unix-style home directory in the filesystem located at /home/me. It is backed by a persistent IndexedDB storage mechanism such that files will persist between browser sessions, and it is initialized to contain .data, Desktop, Documents, and Downloads directories.

func (*FS) Fchmod 

func (f *FS) Fchmod(args []js.Value) (any, error)

func (*FS) Fchown 

func (f *FS) Fchown(args []js.Value) (any, error)

func (*FS) Fstat 

func (f *FS) Fstat(args []js.Value) (any, error)

func (*FS) Fsync 

func (f *FS) Fsync(args []js.Value) (any, error)

func (*FS) Ftruncate 

func (f *FS) Ftruncate(args []js.Value) (any, error)

func (*FS) GetFile 

func (f *FS) GetFile(args []js.Value) (hackpadfs.File, error)

GetFile fetches the file specified by the file descriptor that is the first of the given arguments.

func (*FS) Lchown 

func (f *FS) Lchown(args []js.Value) (any, error)
func (f *FS) Link(args []js.Value) (any, error)

func (*FS) Lstat 

func (f *FS) Lstat(args []js.Value) (any, error)

func (*FS) Mkdir 

func (f *FS) Mkdir(args []js.Value) (any, error)

func (*FS) MkdirAll 

func (f *FS) MkdirAll(args []js.Value) (any, error)

func (*FS) NewFile 

func (f *FS) NewFile(absPath string, flags int, mode os.FileMode) (hackpadfs.File, error)

func (*FS) Open 

func (f *FS) Open(args []js.Value) (any, error)

func (*FS) OpenImpl 

func (f *FS) OpenImpl(path string, flags int, mode hackpadfs.FileMode) (uint64, error)

func (*FS) Read 

func (f *FS) Read(args []js.Value) (any, any, error)

func (*FS) ReadFile 

func (f *FS) ReadFile(args []js.Value) (any, error)

func (*FS) Readdir 

func (f *FS) Readdir(args []js.Value) (any, error)
func (f *FS) Readlink(args []js.Value) (any, error)

func (*FS) Rename 

func (f *FS) Rename(args []js.Value) (any, error)

func (*FS) Rmdir 

func (f *FS) Rmdir(args []js.Value) (any, error)

func (*FS) Stat 

func (f *FS) Stat(args []js.Value) (any, error)
func (f *FS) Symlink(args []js.Value) (any, error)

func (*FS) Truncate 

func (f *FS) Truncate(args []js.Value) (any, error)
func (f *FS) Unlink(args []js.Value) (any, error)

func (*FS) Utimes 

func (f *FS) Utimes(args []js.Value) (any, error)

func (*FS) Write 

func (f *FS) Write(args []js.Value) (any, any, error)

type Func 

type Func interface {
	func(args []js.Value) (any, error) | func(args []js.Value) (any, any, error)
}

Func is the type of a jsfs function.

type NullFile 

type NullFile struct {
	Nm string
}

func (NullFile) Close 

func (f NullFile) Close() error

func (NullFile) Read 

func (f NullFile) Read(p []byte) (n int, err error)

func (NullFile) ReadAt 

func (f NullFile) ReadAt(p []byte, off int64) (n int, err error)

func (NullFile) Seek 

func (f NullFile) Seek(offset int64, whence int) (int64, error)

func (NullFile) Stat 

func (f NullFile) Stat() (os.FileInfo, error)

func (NullFile) Truncate 

func (f NullFile) Truncate(size int64) error

func (NullFile) Write 

func (f NullFile) Write(p []byte) (n int, err error)

func (NullFile) WriteAt 

func (f NullFile) WriteAt(p []byte, off int64) (n int, err error)

type NullStat 

type NullStat struct {
	Nm string
}

func (NullStat) IsDir 

func (s NullStat) IsDir() bool

func (NullStat) ModTime 

func (s NullStat) ModTime() time.Time

func (NullStat) Mode 

func (s NullStat) Mode() os.FileMode

func (NullStat) Name 

func (s NullStat) Name() string

func (NullStat) Size 

func (s NullStat) Size() int64

func (NullStat) Sys 

func (s NullStat) Sys() interface{}

Source Files

View all Source files

Directories

Path Synopsis
examples
config
fromjs
fromjsmount
goroutine
hackpadfs
mountfs
newfs

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