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lib/ui: introduce Invalidatable 

Many Drawable implementations have their own Invalidate and OnInvalidate
functions, with an unexported onInvalidate field. However OnInvalidate and
Invalidate are usually not called in the same goroutine. This results in a race
on this field, e.g.:

    Read at 0x00c000094748 by goroutine 7:
      git.sr.ht/~sircmpwn/aerc2/widgets.NewDirectoryList.func1()
          /home/simon/src/aerc2/widgets/dirlist.go:85 +0x56
      git.sr.ht/~sircmpwn/aerc2/widgets.(*Spinner).Start.func1()
          /home/simon/src/aerc2/widgets/spinner.go:93 +0x1bb

    Previous write at 0x00c000094748 by main goroutine:
      [failed to restore the stack]

    Goroutine 7 (running) created at:
      git.sr.ht/~sircmpwn/aerc2/widgets.(*Spinner).Start()
          /home/simon/src/aerc2/widgets/spinner.go:46 +0x8f
      git.sr.ht/~sircmpwn/aerc2/widgets.NewDirectoryList()
          /home/simon/src/aerc2/widgets/dirlist.go:37 +0x286
      git.sr.ht/~sircmpwn/aerc2/widgets.NewAccountView()
          /home/simon/src/aerc2/widgets/account.go:50 +0x5ca
      git.sr.ht/~sircmpwn/aerc2/widgets.NewAerc()
          /home/simon/src/aerc2/widgets/aerc.go:60 +0x800
      main.main()
          /home/simon/src/aerc2/aerc.go:65 +0x33e

To fix this, introduce a new type, Invalidatable, which protects the field.
Unfortunately the Drawable must be passed to the callback function in
Invalidate, so we still need to re-implement this in each Invalidatable user.
This commit is contained in:
Simon Ser 2019-04-27 16:47:59 +00:00 committed by Drew DeVault
parent 9ef2a57b51
commit 5685a17674
12 changed files with 82 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
lib/ui/borders.go
View File

@ -12,6 +12,7 @@ const (
)
type Bordered struct {
Invalidatable
borders uint
content Drawable
onInvalidate func(d Drawable)
@ -35,13 +36,7 @@ func (bordered *Bordered) Children() []Drawable {
}
func (bordered *Bordered) Invalidate() {
if bordered.onInvalidate != nil {
bordered.onInvalidate(bordered)
}
}
func (bordered *Bordered) OnInvalidate(onInvalidate func(d Drawable)) {
bordered.onInvalidate = onInvalidate
bordered.DoInvalidate(bordered)
}
func (bordered *Bordered) Draw(ctx *Context) {

14
lib/ui/grid.go
View File

@ -6,12 +6,12 @@ import (
)
type Grid struct {
Invalidatable
rows []GridSpec
rowLayout []gridLayout
columns []GridSpec
columnLayout []gridLayout
cells []*GridCell
onInvalidate func(d Drawable)
invalid bool
}
@ -141,9 +141,7 @@ func (grid *Grid) reflow(ctx *Context) {
func (grid *Grid) invalidateLayout() {
grid.invalid = true
if grid.onInvalidate != nil {
grid.onInvalidate(grid)
}
grid.DoInvalidate(grid)
}
func (grid *Grid) Invalidate() {
@ -153,10 +151,6 @@ func (grid *Grid) Invalidate() {
}
}
func (grid *Grid) OnInvalidate(onInvalidate func(d Drawable)) {
grid.onInvalidate = onInvalidate
}
func (grid *Grid) AddChild(content Drawable) *GridCell {
cell := &GridCell{
RowSpan: 1,
@ -193,7 +187,5 @@ func (grid *Grid) cellInvalidated(drawable Drawable) {
panic(fmt.Errorf("Attempted to invalidate unknown cell"))
}
cell.invalid = true
if grid.onInvalidate != nil {
grid.onInvalidate(grid)
}
grid.DoInvalidate(grid)
}

24
lib/ui/invalidatable.go Normal file
View File

@ -0,0 +1,24 @@
package ui
import (
"sync/atomic"
)
type Invalidatable struct {
onInvalidate atomic.Value
}
func (i *Invalidatable) OnInvalidate(f func(d Drawable)) {
i.onInvalidate.Store(f)
}
func (i *Invalidatable) DoInvalidate(d Drawable) {
v := i.onInvalidate.Load()
if v == nil {
return
}
f := v.(func(d Drawable))
if f != nil {
f(d)
}
}

22
lib/ui/text.go
View File

@ -12,13 +12,13 @@ const (
)
type Text struct {
text string
strategy uint
fg tcell.Color
bg tcell.Color
bold bool
reverse bool
onInvalidate func(d Drawable)
Invalidatable
text string
strategy uint
fg tcell.Color
bg tcell.Color
bold bool
reverse bool
}
func NewText(text string) *Text {
@ -80,12 +80,6 @@ func (t *Text) Draw(ctx *Context) {
ctx.Printf(x, 0, style, t.text)
}
func (t *Text) OnInvalidate(onInvalidate func(d Drawable)) {
t.onInvalidate = onInvalidate
}
func (t *Text) Invalidate() {
if t.onInvalidate != nil {
t.onInvalidate(t)
}
t.DoInvalidate(t)
}

19
widgets/account.go
View File

@ -14,16 +14,15 @@ import (
)
type AccountView struct {
acct *config.AccountConfig
conf *config.AercConfig
dirlist *DirectoryList
grid *ui.Grid
host TabHost
logger *log.Logger
onInvalidate func(d ui.Drawable)
msglist *MessageList
msgStores map[string]*lib.MessageStore
worker *types.Worker
acct *config.AccountConfig
conf *config.AercConfig
dirlist *DirectoryList
grid *ui.Grid
host TabHost
logger *log.Logger
msglist *MessageList
msgStores map[string]*lib.MessageStore
worker *types.Worker
}
func NewAccountView(conf *config.AercConfig, acct *config.AccountConfig,

10
widgets/dirlist.go
View File

@ -12,10 +12,10 @@ import (
)
type DirectoryList struct {
ui.Invalidatable
conf *config.AccountConfig
dirs []string
logger *log.Logger
onInvalidate func(d ui.Drawable)
selecting string
selected string
spinner *Spinner
@ -77,14 +77,8 @@ func (dirlist *DirectoryList) Selected() string {
return dirlist.selected
}
func (dirlist *DirectoryList) OnInvalidate(onInvalidate func(d ui.Drawable)) {
dirlist.onInvalidate = onInvalidate
}
func (dirlist *DirectoryList) Invalidate() {
if dirlist.onInvalidate != nil {
dirlist.onInvalidate(dirlist)
}
dirlist.DoInvalidate(dirlist)
}
func (dirlist *DirectoryList) Draw(ctx *ui.Context) {

9
widgets/exline.go
View File

@ -12,6 +12,7 @@ import (
// TODO: scrolling
type ExLine struct {
ui.Invalidatable
command []rune
commit func(cmd string)
ctx *ui.Context
@ -33,14 +34,8 @@ func NewExLine(commit func(cmd string), cancel func()) *ExLine {
}
}
func (ex *ExLine) OnInvalidate(onInvalidate func(d ui.Drawable)) {
ex.onInvalidate = onInvalidate
}
func (ex *ExLine) Invalidate() {
if ex.onInvalidate != nil {
ex.onInvalidate(ex)
}
ex.DoInvalidate(ex)
}
func (ex *ExLine) Draw(ctx *ui.Context) {

24
widgets/msglist.go
View File

@ -12,14 +12,14 @@ import (
)
type MessageList struct {
conf *config.AercConfig
logger *log.Logger
height int
onInvalidate func(d ui.Drawable)
scroll int
selected int
spinner *Spinner
store *lib.MessageStore
ui.Invalidatable
conf *config.AercConfig
logger *log.Logger
height int
scroll int
selected int
spinner *Spinner
store *lib.MessageStore
}
// TODO: fish in config
@ -37,14 +37,8 @@ func NewMessageList(logger *log.Logger) *MessageList {
return ml
}
func (ml *MessageList) OnInvalidate(onInvalidate func(d ui.Drawable)) {
ml.onInvalidate = onInvalidate
}
func (ml *MessageList) Invalidate() {
if ml.onInvalidate != nil {
ml.onInvalidate(ml)
}
ml.DoInvalidate(ml)
}
func (ml *MessageList) Draw(ctx *ui.Context) {

21
widgets/msgviewer.go
View File

@ -252,8 +252,7 @@ func (mv *MessageViewer) Focus(focus bool) {
}
type HeaderView struct {
onInvalidate func(d ui.Drawable)
ui.Invalidatable
Name string
Value string
}
@ -281,17 +280,11 @@ func (hv *HeaderView) Draw(ctx *ui.Context) {
}
func (hv *HeaderView) Invalidate() {
if hv.onInvalidate != nil {
hv.onInvalidate(hv)
}
}
func (hv *HeaderView) OnInvalidate(fn func(d ui.Drawable)) {
hv.onInvalidate = fn
hv.DoInvalidate(hv)
}
type MultipartView struct {
onInvalidate func(d ui.Drawable)
ui.Invalidatable
}
func (mpv *MultipartView) Draw(ctx *ui.Context) {
@ -303,11 +296,5 @@ func (mpv *MultipartView) Draw(ctx *ui.Context) {
}
func (mpv *MultipartView) Invalidate() {
if mpv.onInvalidate != nil {
mpv.onInvalidate(mpv)
}
}
func (mpv *MultipartView) OnInvalidate(fn func(d ui.Drawable)) {
mpv.onInvalidate = fn
mpv.DoInvalidate(mpv)
}

10
widgets/spinner.go
View File

@ -23,8 +23,8 @@ var (
)
type Spinner struct {
ui.Invalidatable
frame int64 // access via atomic
onInvalidate func(d ui.Drawable)
stop chan struct{}
}
@ -84,12 +84,6 @@ func (s *Spinner) Draw(ctx *ui.Context) {
ctx.Printf(col, 0, tcell.StyleDefault, "%s", frames[cur])
}
func (s *Spinner) OnInvalidate(onInvalidate func(d ui.Drawable)) {
s.onInvalidate = onInvalidate
}
func (s *Spinner) Invalidate() {
if s.onInvalidate != nil {
s.onInvalidate(s)
}
s.DoInvalidate(s)
}

11
widgets/status.go
View File

@ -9,10 +9,9 @@ import (
)
type StatusLine struct {
ui.Invalidatable
stack []*StatusMessage
fallback StatusMessage
onInvalidate func(d ui.Drawable)
}
type StatusMessage struct {
@ -31,14 +30,8 @@ func NewStatusLine() *StatusLine {
}
}
func (status *StatusLine) OnInvalidate(onInvalidate func(d ui.Drawable)) {
status.onInvalidate = onInvalidate
}
func (status *StatusLine) Invalidate() {
if status.onInvalidate != nil {
status.onInvalidate(status)
}
status.DoInvalidate(status)
}
func (status *StatusLine) Draw(ctx *ui.Context) {

36
widgets/terminal.go
View File

@ -88,20 +88,20 @@ func init() {
}
type Terminal struct {
closed bool
cmd *exec.Cmd
colors map[tcell.Color]tcell.Color
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
damage []vterm.Rect
destroyed bool
err error
focus bool
onInvalidate func(d ui.Drawable)
pty *os.File
start chan interface{}
vterm *vterm.VTerm
ui.Invalidatable
closed bool
cmd *exec.Cmd
colors map[tcell.Color]tcell.Color
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
damage []vterm.Rect
destroyed bool
err error
focus bool
pty *os.File
start chan interface{}
vterm *vterm.VTerm
OnClose func(err error)
OnStart func()
@ -225,10 +225,6 @@ func (term *Terminal) Destroy() {
term.destroyed = true
}
func (term *Terminal) OnInvalidate(cb func(d ui.Drawable)) {
term.onInvalidate = cb
}
func (term *Terminal) Invalidate() {
if term.vterm != nil {
width, height := term.vterm.Size()
@ -239,9 +235,7 @@ func (term *Terminal) Invalidate() {
}
func (term *Terminal) invalidate() {
if term.onInvalidate != nil {
term.onInvalidate(term)
}
term.DoInvalidate(term)
}
func (term *Terminal) Draw(ctx *ui.Context) {