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fs: add ChangeNotify and backend support for it (#2094)

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* fs: rename DirChangeNotify to ChangeNotify

* cache: switch to ChangeNotify

* ChangeNotify: keep order of notifications
This commit is contained in:
Remus Bunduc 2018-03-08 22:03:34 +02:00 • committed by GitHub
parent b3f55d6bda
commit 70f07fd3ac
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35 changed files with 447 additions and 230 deletions
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31
fs/fs.go
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@ -19,6 +19,9 @@ import (
"github.com/pkg/errors"
)
// EntryType can be associated with remote paths to identify their type
type EntryType int
// Constants
const (
// ModTimeNotSupported is a very large precision value to show
@ -26,6 +29,10 @@ const (
ModTimeNotSupported = 100 * 365 * 24 * time.Hour
// MaxLevel is a sentinel representing an infinite depth for listings
MaxLevel = math.MaxInt32
// EntryDirectory should be used to classify remote paths in directories
EntryDirectory EntryType = iota // 0
// EntryObject should be used to classify remote paths in objects
EntryObject // 1
)
// Globals
@ -303,10 +310,10 @@ type Features struct {
// If destination exists then return fs.ErrorDirExists
DirMove func(src Fs, srcRemote, dstRemote string) error
// DirChangeNotify calls the passed function with a path
// of a directory that has had changes. If the implementation
// ChangeNotify calls the passed function with a path
// that has had changes. If the implementation
// uses polling, it should adhere to the given interval.
DirChangeNotify func(func(string), time.Duration) chan bool
ChangeNotify func(func(string, EntryType), time.Duration) chan bool
// UnWrap returns the Fs that this Fs is wrapping
UnWrap func() Fs
@ -423,8 +430,8 @@ func (ft *Features) Fill(f Fs) *Features {
if do, ok := f.(DirMover); ok {
ft.DirMove = do.DirMove
}
if do, ok := f.(DirChangeNotifier); ok {
ft.DirChangeNotify = do.DirChangeNotify
if do, ok := f.(ChangeNotifier); ok {
ft.ChangeNotify = do.ChangeNotify
}
if do, ok := f.(UnWrapper); ok {
ft.UnWrap = do.UnWrap
@ -480,8 +487,8 @@ func (ft *Features) Mask(f Fs) *Features {
if mask.DirMove == nil {
ft.DirMove = nil
}
if mask.DirChangeNotify == nil {
ft.DirChangeNotify = nil
if mask.ChangeNotify == nil {
ft.ChangeNotify = nil
}
// if mask.UnWrap == nil {
// ft.UnWrap = nil
@ -583,12 +590,12 @@ type DirMover interface {
DirMove(src Fs, srcRemote, dstRemote string) error
}
// DirChangeNotifier is an optional interface for Fs
type DirChangeNotifier interface {
// DirChangeNotify calls the passed function with a path
// of a directory that has had changes. If the implementation
// ChangeNotifier is an optional interface for Fs
type ChangeNotifier interface {
// ChangeNotify calls the passed function with a path
// that has had changes. If the implementation
// uses polling, it should adhere to the given interval.
DirChangeNotify(func(string), time.Duration) chan bool
ChangeNotify(func(string, EntryType), time.Duration) chan bool
}
// UnWrapper is an optional interfaces for Fs