144 lines
4.5 KiB
Go
144 lines
4.5 KiB
Go
// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
|
|
// Use of this source code is governed by the MIT license that can be
|
|
// found in the LICENSE file.
|
|
|
|
package notify
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// Event represents the type of filesystem action.
|
|
//
|
|
// Number of available event values is dependent on the target system or the
|
|
// watcher implmenetation used (e.g. it's possible to use either kqueue or
|
|
// FSEvents on Darwin).
|
|
//
|
|
// Please consult documentation for your target platform to see list of all
|
|
// available events.
|
|
type Event uint32
|
|
|
|
// Create, Remove, Write and Rename are the only event values guaranteed to be
|
|
// present on all platforms.
|
|
const (
|
|
Create = osSpecificCreate
|
|
Remove = osSpecificRemove
|
|
Write = osSpecificWrite
|
|
Rename = osSpecificRename
|
|
|
|
// All is handful alias for all platform-independent event values.
|
|
All = Create | Remove | Write | Rename
|
|
)
|
|
|
|
const internal = recursive | omit
|
|
|
|
// String implements fmt.Stringer interface.
|
|
func (e Event) String() string {
|
|
var s []string
|
|
for _, strmap := range []map[Event]string{estr, osestr} {
|
|
for ev, str := range strmap {
|
|
if e&ev == ev {
|
|
s = append(s, str)
|
|
}
|
|
}
|
|
}
|
|
return strings.Join(s, "|")
|
|
}
|
|
|
|
// EventInfo describes an event reported by the underlying filesystem notification
|
|
// subsystem.
|
|
//
|
|
// It always describes single event, even if the OS reported a coalesced action.
|
|
// Reported path is absolute and clean.
|
|
//
|
|
// For non-recursive watchpoints its base is always equal to the path passed
|
|
// to corresponding Watch call.
|
|
//
|
|
// The value of Sys if system-dependent and can be nil.
|
|
//
|
|
// Sys
|
|
//
|
|
// Under Darwin (FSEvents) Sys() always returns a non-nil *notify.FSEvent value,
|
|
// which is defined as:
|
|
//
|
|
// type FSEvent struct {
|
|
// Path string // real path of the file or directory
|
|
// ID uint64 // ID of the event (FSEventStreamEventId)
|
|
// Flags uint32 // joint FSEvents* flags (FSEventStreamEventFlags)
|
|
// }
|
|
//
|
|
// For possible values of Flags see Darwin godoc for notify or FSEvents
|
|
// documentation for FSEventStreamEventFlags constants:
|
|
//
|
|
// https://developer.apple.com/library/mac/documentation/Darwin/Reference/FSEvents_Ref/index.html#//apple_ref/doc/constant_group/FSEventStreamEventFlags
|
|
//
|
|
// Under Linux (inotify) Sys() always returns a non-nil *unix.InotifyEvent
|
|
// value, defined as:
|
|
//
|
|
// type InotifyEvent struct {
|
|
// Wd int32 // Watch descriptor
|
|
// Mask uint32 // Mask describing event
|
|
// Cookie uint32 // Unique cookie associating related events (for rename(2))
|
|
// Len uint32 // Size of name field
|
|
// Name [0]uint8 // Optional null-terminated name
|
|
// }
|
|
//
|
|
// More information about inotify masks and the usage of inotify_event structure
|
|
// can be found at:
|
|
//
|
|
// http://man7.org/linux/man-pages/man7/inotify.7.html
|
|
//
|
|
// Under Darwin, DragonFlyBSD, FreeBSD, NetBSD, OpenBSD (kqueue) Sys() always
|
|
// returns a non-nil *notify.Kevent value, which is defined as:
|
|
//
|
|
// type Kevent struct {
|
|
// Kevent *syscall.Kevent_t // Kevent is a kqueue specific structure
|
|
// FI os.FileInfo // FI describes file/dir
|
|
// }
|
|
//
|
|
// More information about syscall.Kevent_t can be found at:
|
|
//
|
|
// https://www.freebsd.org/cgi/man.cgi?query=kqueue
|
|
//
|
|
// Under Windows (ReadDirectoryChangesW) Sys() always returns nil. The documentation
|
|
// of watcher's WinAPI function can be found at:
|
|
//
|
|
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365465%28v=vs.85%29.aspx
|
|
type EventInfo interface {
|
|
Event() Event // event value for the filesystem action
|
|
Path() string // real path of the file or directory
|
|
Sys() interface{} // underlying data source (can return nil)
|
|
}
|
|
|
|
type isDirer interface {
|
|
isDir() (bool, error)
|
|
}
|
|
|
|
var _ fmt.Stringer = (*event)(nil)
|
|
var _ isDirer = (*event)(nil)
|
|
|
|
// String implements fmt.Stringer interface.
|
|
func (e *event) String() string {
|
|
return e.Event().String() + `: "` + e.Path() + `"`
|
|
}
|
|
|
|
var estr = map[Event]string{
|
|
Create: "notify.Create",
|
|
Remove: "notify.Remove",
|
|
Write: "notify.Write",
|
|
Rename: "notify.Rename",
|
|
// Display name for recursive event is added only for debugging
|
|
// purposes. It's an internal event after all and won't be exposed to the
|
|
// user. Having Recursive event printable is helpful, e.g. for reading
|
|
// testing failure messages:
|
|
//
|
|
// --- FAIL: TestWatchpoint (0.00 seconds)
|
|
// watchpoint_test.go:64: want diff=[notify.Remove notify.Create|notify.Remove];
|
|
// got [notify.Remove notify.Remove|notify.Create] (i=1)
|
|
//
|
|
// Yup, here the diff have Recursive event inside. Go figure.
|
|
recursive: "recursive",
|
|
omit: "omit",
|
|
}
|