mirror of
https://github.com/ceph/ceph-csi.git
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vendor update for E2E framework
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna
561
vendor/gopkg.in/fsnotify.v1/windows.go
generated
vendored
Normal file
561
vendor/gopkg.in/fsnotify.v1/windows.go
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vendored
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@ -0,0 +1,561 @@
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package fsnotify
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"sync"
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"syscall"
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"unsafe"
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)
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// Watcher watches a set of files, delivering events to a channel.
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type Watcher struct {
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Events chan Event
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Errors chan error
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isClosed bool // Set to true when Close() is first called
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mu sync.Mutex // Map access
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port syscall.Handle // Handle to completion port
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watches watchMap // Map of watches (key: i-number)
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input chan *input // Inputs to the reader are sent on this channel
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quit chan chan<- error
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}
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// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
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func NewWatcher() (*Watcher, error) {
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port, e := syscall.CreateIoCompletionPort(syscall.InvalidHandle, 0, 0, 0)
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if e != nil {
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return nil, os.NewSyscallError("CreateIoCompletionPort", e)
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}
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w := &Watcher{
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port: port,
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watches: make(watchMap),
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input: make(chan *input, 1),
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Events: make(chan Event, 50),
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Errors: make(chan error),
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quit: make(chan chan<- error, 1),
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}
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go w.readEvents()
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return w, nil
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}
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// Close removes all watches and closes the events channel.
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func (w *Watcher) Close() error {
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if w.isClosed {
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return nil
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}
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w.isClosed = true
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// Send "quit" message to the reader goroutine
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ch := make(chan error)
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w.quit <- ch
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-ch
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}
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// Add starts watching the named file or directory (non-recursively).
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func (w *Watcher) Add(name string) error {
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if w.isClosed {
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return errors.New("watcher already closed")
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}
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in := &input{
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op: opAddWatch,
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path: filepath.Clean(name),
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flags: sysFSALLEVENTS,
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reply: make(chan error),
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}
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w.input <- in
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-in.reply
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}
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// Remove stops watching the the named file or directory (non-recursively).
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func (w *Watcher) Remove(name string) error {
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in := &input{
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op: opRemoveWatch,
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path: filepath.Clean(name),
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reply: make(chan error),
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}
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w.input <- in
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if err := w.wakeupReader(); err != nil {
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return err
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}
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return <-in.reply
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}
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const (
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// Options for AddWatch
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sysFSONESHOT = 0x80000000
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sysFSONLYDIR = 0x1000000
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// Events
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sysFSACCESS = 0x1
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sysFSALLEVENTS = 0xfff
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sysFSATTRIB = 0x4
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sysFSCLOSE = 0x18
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sysFSCREATE = 0x100
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sysFSDELETE = 0x200
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sysFSDELETESELF = 0x400
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sysFSMODIFY = 0x2
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sysFSMOVE = 0xc0
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sysFSMOVEDFROM = 0x40
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sysFSMOVEDTO = 0x80
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sysFSMOVESELF = 0x800
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// Special events
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sysFSIGNORED = 0x8000
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sysFSQOVERFLOW = 0x4000
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)
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func newEvent(name string, mask uint32) Event {
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e := Event{Name: name}
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if mask&sysFSCREATE == sysFSCREATE || mask&sysFSMOVEDTO == sysFSMOVEDTO {
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e.Op |= Create
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}
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if mask&sysFSDELETE == sysFSDELETE || mask&sysFSDELETESELF == sysFSDELETESELF {
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e.Op |= Remove
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}
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if mask&sysFSMODIFY == sysFSMODIFY {
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e.Op |= Write
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}
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if mask&sysFSMOVE == sysFSMOVE || mask&sysFSMOVESELF == sysFSMOVESELF || mask&sysFSMOVEDFROM == sysFSMOVEDFROM {
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e.Op |= Rename
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}
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if mask&sysFSATTRIB == sysFSATTRIB {
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e.Op |= Chmod
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}
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return e
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}
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const (
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opAddWatch = iota
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opRemoveWatch
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)
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const (
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provisional uint64 = 1 << (32 + iota)
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)
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type input struct {
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op int
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path string
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flags uint32
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reply chan error
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}
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type inode struct {
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handle syscall.Handle
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volume uint32
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index uint64
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}
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type watch struct {
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ov syscall.Overlapped
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ino *inode // i-number
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path string // Directory path
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mask uint64 // Directory itself is being watched with these notify flags
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names map[string]uint64 // Map of names being watched and their notify flags
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rename string // Remembers the old name while renaming a file
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buf [4096]byte
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}
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type indexMap map[uint64]*watch
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type watchMap map[uint32]indexMap
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func (w *Watcher) wakeupReader() error {
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e := syscall.PostQueuedCompletionStatus(w.port, 0, 0, nil)
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if e != nil {
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return os.NewSyscallError("PostQueuedCompletionStatus", e)
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}
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return nil
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}
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func getDir(pathname string) (dir string, err error) {
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attr, e := syscall.GetFileAttributes(syscall.StringToUTF16Ptr(pathname))
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if e != nil {
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return "", os.NewSyscallError("GetFileAttributes", e)
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}
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if attr&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
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dir = pathname
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} else {
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dir, _ = filepath.Split(pathname)
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dir = filepath.Clean(dir)
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}
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return
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}
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func getIno(path string) (ino *inode, err error) {
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h, e := syscall.CreateFile(syscall.StringToUTF16Ptr(path),
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syscall.FILE_LIST_DIRECTORY,
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syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
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nil, syscall.OPEN_EXISTING,
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syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OVERLAPPED, 0)
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if e != nil {
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return nil, os.NewSyscallError("CreateFile", e)
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}
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var fi syscall.ByHandleFileInformation
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if e = syscall.GetFileInformationByHandle(h, &fi); e != nil {
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syscall.CloseHandle(h)
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return nil, os.NewSyscallError("GetFileInformationByHandle", e)
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}
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ino = &inode{
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handle: h,
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volume: fi.VolumeSerialNumber,
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index: uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
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}
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return ino, nil
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}
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// Must run within the I/O thread.
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func (m watchMap) get(ino *inode) *watch {
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if i := m[ino.volume]; i != nil {
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return i[ino.index]
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}
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return nil
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}
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// Must run within the I/O thread.
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func (m watchMap) set(ino *inode, watch *watch) {
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i := m[ino.volume]
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if i == nil {
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i = make(indexMap)
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m[ino.volume] = i
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}
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i[ino.index] = watch
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}
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// Must run within the I/O thread.
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func (w *Watcher) addWatch(pathname string, flags uint64) error {
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dir, err := getDir(pathname)
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if err != nil {
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return err
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}
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if flags&sysFSONLYDIR != 0 && pathname != dir {
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return nil
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}
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ino, err := getIno(dir)
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if err != nil {
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return err
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}
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w.mu.Lock()
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watchEntry := w.watches.get(ino)
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w.mu.Unlock()
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if watchEntry == nil {
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if _, e := syscall.CreateIoCompletionPort(ino.handle, w.port, 0, 0); e != nil {
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syscall.CloseHandle(ino.handle)
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return os.NewSyscallError("CreateIoCompletionPort", e)
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}
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watchEntry = &watch{
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ino: ino,
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path: dir,
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names: make(map[string]uint64),
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}
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w.mu.Lock()
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w.watches.set(ino, watchEntry)
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w.mu.Unlock()
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flags |= provisional
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} else {
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syscall.CloseHandle(ino.handle)
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}
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if pathname == dir {
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watchEntry.mask |= flags
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} else {
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watchEntry.names[filepath.Base(pathname)] |= flags
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}
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if err = w.startRead(watchEntry); err != nil {
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return err
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}
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if pathname == dir {
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watchEntry.mask &= ^provisional
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} else {
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watchEntry.names[filepath.Base(pathname)] &= ^provisional
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}
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return nil
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}
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// Must run within the I/O thread.
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func (w *Watcher) remWatch(pathname string) error {
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dir, err := getDir(pathname)
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if err != nil {
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return err
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}
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ino, err := getIno(dir)
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if err != nil {
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return err
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}
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w.mu.Lock()
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watch := w.watches.get(ino)
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w.mu.Unlock()
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if watch == nil {
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return fmt.Errorf("can't remove non-existent watch for: %s", pathname)
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}
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if pathname == dir {
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w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
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watch.mask = 0
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} else {
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name := filepath.Base(pathname)
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w.sendEvent(filepath.Join(watch.path, name), watch.names[name]&sysFSIGNORED)
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delete(watch.names, name)
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}
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return w.startRead(watch)
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}
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// Must run within the I/O thread.
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func (w *Watcher) deleteWatch(watch *watch) {
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for name, mask := range watch.names {
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if mask&provisional == 0 {
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w.sendEvent(filepath.Join(watch.path, name), mask&sysFSIGNORED)
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}
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delete(watch.names, name)
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}
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if watch.mask != 0 {
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if watch.mask&provisional == 0 {
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||||
w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
|
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}
|
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watch.mask = 0
|
||||
}
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}
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|
||||
// Must run within the I/O thread.
|
||||
func (w *Watcher) startRead(watch *watch) error {
|
||||
if e := syscall.CancelIo(watch.ino.handle); e != nil {
|
||||
w.Errors <- os.NewSyscallError("CancelIo", e)
|
||||
w.deleteWatch(watch)
|
||||
}
|
||||
mask := toWindowsFlags(watch.mask)
|
||||
for _, m := range watch.names {
|
||||
mask |= toWindowsFlags(m)
|
||||
}
|
||||
if mask == 0 {
|
||||
if e := syscall.CloseHandle(watch.ino.handle); e != nil {
|
||||
w.Errors <- os.NewSyscallError("CloseHandle", e)
|
||||
}
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||||
w.mu.Lock()
|
||||
delete(w.watches[watch.ino.volume], watch.ino.index)
|
||||
w.mu.Unlock()
|
||||
return nil
|
||||
}
|
||||
e := syscall.ReadDirectoryChanges(watch.ino.handle, &watch.buf[0],
|
||||
uint32(unsafe.Sizeof(watch.buf)), false, mask, nil, &watch.ov, 0)
|
||||
if e != nil {
|
||||
err := os.NewSyscallError("ReadDirectoryChanges", e)
|
||||
if e == syscall.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
|
||||
// Watched directory was probably removed
|
||||
if w.sendEvent(watch.path, watch.mask&sysFSDELETESELF) {
|
||||
if watch.mask&sysFSONESHOT != 0 {
|
||||
watch.mask = 0
|
||||
}
|
||||
}
|
||||
err = nil
|
||||
}
|
||||
w.deleteWatch(watch)
|
||||
w.startRead(watch)
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// readEvents reads from the I/O completion port, converts the
|
||||
// received events into Event objects and sends them via the Events channel.
|
||||
// Entry point to the I/O thread.
|
||||
func (w *Watcher) readEvents() {
|
||||
var (
|
||||
n, key uint32
|
||||
ov *syscall.Overlapped
|
||||
)
|
||||
runtime.LockOSThread()
|
||||
|
||||
for {
|
||||
e := syscall.GetQueuedCompletionStatus(w.port, &n, &key, &ov, syscall.INFINITE)
|
||||
watch := (*watch)(unsafe.Pointer(ov))
|
||||
|
||||
if watch == nil {
|
||||
select {
|
||||
case ch := <-w.quit:
|
||||
w.mu.Lock()
|
||||
var indexes []indexMap
|
||||
for _, index := range w.watches {
|
||||
indexes = append(indexes, index)
|
||||
}
|
||||
w.mu.Unlock()
|
||||
for _, index := range indexes {
|
||||
for _, watch := range index {
|
||||
w.deleteWatch(watch)
|
||||
w.startRead(watch)
|
||||
}
|
||||
}
|
||||
var err error
|
||||
if e := syscall.CloseHandle(w.port); e != nil {
|
||||
err = os.NewSyscallError("CloseHandle", e)
|
||||
}
|
||||
close(w.Events)
|
||||
close(w.Errors)
|
||||
ch <- err
|
||||
return
|
||||
case in := <-w.input:
|
||||
switch in.op {
|
||||
case opAddWatch:
|
||||
in.reply <- w.addWatch(in.path, uint64(in.flags))
|
||||
case opRemoveWatch:
|
||||
in.reply <- w.remWatch(in.path)
|
||||
}
|
||||
default:
|
||||
}
|
||||
continue
|
||||
}
|
||||
|
||||
switch e {
|
||||
case syscall.ERROR_MORE_DATA:
|
||||
if watch == nil {
|
||||
w.Errors <- errors.New("ERROR_MORE_DATA has unexpectedly null lpOverlapped buffer")
|
||||
} else {
|
||||
// The i/o succeeded but the buffer is full.
|
||||
// In theory we should be building up a full packet.
|
||||
// In practice we can get away with just carrying on.
|
||||
n = uint32(unsafe.Sizeof(watch.buf))
|
||||
}
|
||||
case syscall.ERROR_ACCESS_DENIED:
|
||||
// Watched directory was probably removed
|
||||
w.sendEvent(watch.path, watch.mask&sysFSDELETESELF)
|
||||
w.deleteWatch(watch)
|
||||
w.startRead(watch)
|
||||
continue
|
||||
case syscall.ERROR_OPERATION_ABORTED:
|
||||
// CancelIo was called on this handle
|
||||
continue
|
||||
default:
|
||||
w.Errors <- os.NewSyscallError("GetQueuedCompletionPort", e)
|
||||
continue
|
||||
case nil:
|
||||
}
|
||||
|
||||
var offset uint32
|
||||
for {
|
||||
if n == 0 {
|
||||
w.Events <- newEvent("", sysFSQOVERFLOW)
|
||||
w.Errors <- errors.New("short read in readEvents()")
|
||||
break
|
||||
}
|
||||
|
||||
// Point "raw" to the event in the buffer
|
||||
raw := (*syscall.FileNotifyInformation)(unsafe.Pointer(&watch.buf[offset]))
|
||||
buf := (*[syscall.MAX_PATH]uint16)(unsafe.Pointer(&raw.FileName))
|
||||
name := syscall.UTF16ToString(buf[:raw.FileNameLength/2])
|
||||
fullname := filepath.Join(watch.path, name)
|
||||
|
||||
var mask uint64
|
||||
switch raw.Action {
|
||||
case syscall.FILE_ACTION_REMOVED:
|
||||
mask = sysFSDELETESELF
|
||||
case syscall.FILE_ACTION_MODIFIED:
|
||||
mask = sysFSMODIFY
|
||||
case syscall.FILE_ACTION_RENAMED_OLD_NAME:
|
||||
watch.rename = name
|
||||
case syscall.FILE_ACTION_RENAMED_NEW_NAME:
|
||||
if watch.names[watch.rename] != 0 {
|
||||
watch.names[name] |= watch.names[watch.rename]
|
||||
delete(watch.names, watch.rename)
|
||||
mask = sysFSMOVESELF
|
||||
}
|
||||
}
|
||||
|
||||
sendNameEvent := func() {
|
||||
if w.sendEvent(fullname, watch.names[name]&mask) {
|
||||
if watch.names[name]&sysFSONESHOT != 0 {
|
||||
delete(watch.names, name)
|
||||
}
|
||||
}
|
||||
}
|
||||
if raw.Action != syscall.FILE_ACTION_RENAMED_NEW_NAME {
|
||||
sendNameEvent()
|
||||
}
|
||||
if raw.Action == syscall.FILE_ACTION_REMOVED {
|
||||
w.sendEvent(fullname, watch.names[name]&sysFSIGNORED)
|
||||
delete(watch.names, name)
|
||||
}
|
||||
if w.sendEvent(fullname, watch.mask&toFSnotifyFlags(raw.Action)) {
|
||||
if watch.mask&sysFSONESHOT != 0 {
|
||||
watch.mask = 0
|
||||
}
|
||||
}
|
||||
if raw.Action == syscall.FILE_ACTION_RENAMED_NEW_NAME {
|
||||
fullname = filepath.Join(watch.path, watch.rename)
|
||||
sendNameEvent()
|
||||
}
|
||||
|
||||
// Move to the next event in the buffer
|
||||
if raw.NextEntryOffset == 0 {
|
||||
break
|
||||
}
|
||||
offset += raw.NextEntryOffset
|
||||
|
||||
// Error!
|
||||
if offset >= n {
|
||||
w.Errors <- errors.New("Windows system assumed buffer larger than it is, events have likely been missed.")
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if err := w.startRead(watch); err != nil {
|
||||
w.Errors <- err
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (w *Watcher) sendEvent(name string, mask uint64) bool {
|
||||
if mask == 0 {
|
||||
return false
|
||||
}
|
||||
event := newEvent(name, uint32(mask))
|
||||
select {
|
||||
case ch := <-w.quit:
|
||||
w.quit <- ch
|
||||
case w.Events <- event:
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func toWindowsFlags(mask uint64) uint32 {
|
||||
var m uint32
|
||||
if mask&sysFSACCESS != 0 {
|
||||
m |= syscall.FILE_NOTIFY_CHANGE_LAST_ACCESS
|
||||
}
|
||||
if mask&sysFSMODIFY != 0 {
|
||||
m |= syscall.FILE_NOTIFY_CHANGE_LAST_WRITE
|
||||
}
|
||||
if mask&sysFSATTRIB != 0 {
|
||||
m |= syscall.FILE_NOTIFY_CHANGE_ATTRIBUTES
|
||||
}
|
||||
if mask&(sysFSMOVE|sysFSCREATE|sysFSDELETE) != 0 {
|
||||
m |= syscall.FILE_NOTIFY_CHANGE_FILE_NAME | syscall.FILE_NOTIFY_CHANGE_DIR_NAME
|
||||
}
|
||||
return m
|
||||
}
|
||||
|
||||
func toFSnotifyFlags(action uint32) uint64 {
|
||||
switch action {
|
||||
case syscall.FILE_ACTION_ADDED:
|
||||
return sysFSCREATE
|
||||
case syscall.FILE_ACTION_REMOVED:
|
||||
return sysFSDELETE
|
||||
case syscall.FILE_ACTION_MODIFIED:
|
||||
return sysFSMODIFY
|
||||
case syscall.FILE_ACTION_RENAMED_OLD_NAME:
|
||||
return sysFSMOVEDFROM
|
||||
case syscall.FILE_ACTION_RENAMED_NEW_NAME:
|
||||
return sysFSMOVEDTO
|
||||
}
|
||||
return 0
|
||||
}
|
||||
Reference in New Issue
Block a user