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preferences.go
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preferences.go
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package app
import (
"encoding/json"
"os"
"path/filepath"
"sync"
"time"
"github.com/gorustyt/fyne/v2"
"github.com/gorustyt/fyne/v2/internal"
)
type preferences struct {
*internal.InMemoryPreferences
prefLock sync.RWMutex
loadingInProgress bool
savedRecently bool
changedDuringSaving bool
app *fyneApp
needsSaveBeforeExit bool
}
// Declare conformity with Preferences interface
var _ fyne.Preferences = (*preferences)(nil)
// forceImmediateSave writes preferences to file immediately, ignoring the debouncing
// logic in the change listener. Does nothing if preferences are not backed with a file.
func (p *preferences) forceImmediateSave() {
if !p.needsSaveBeforeExit {
return
}
err := p.save()
if err != nil {
fyne.LogError("Failed on force saving preferences", err)
}
}
func (p *preferences) resetSavedRecently() {
go func() {
time.Sleep(time.Millisecond * 100) // writes are not always atomic. 10ms worked, 100 is safer.
p.prefLock.Lock()
p.savedRecently = false
changedDuringSaving := p.changedDuringSaving
p.changedDuringSaving = false
p.prefLock.Unlock()
if changedDuringSaving {
p.save()
}
}()
}
func (p *preferences) save() error {
return p.saveToFile(p.storagePath())
}
func (p *preferences) saveToFile(path string) error {
p.prefLock.Lock()
p.savedRecently = true
p.prefLock.Unlock()
defer p.resetSavedRecently()
err := os.MkdirAll(filepath.Dir(path), 0700)
if err != nil { // this is not an exists error according to docs
return err
}
file, err := os.Create(path)
if err != nil {
if !os.IsExist(err) {
return err
}
file, err = os.Open(path) // #nosec
if err != nil {
return err
}
}
defer file.Close()
encode := json.NewEncoder(file)
p.InMemoryPreferences.ReadValues(func(values map[string]interface{}) {
err = encode.Encode(&values)
})
err2 := file.Sync()
if err == nil {
err = err2
}
return err
}
func (p *preferences) load() {
err := p.loadFromFile(p.storagePath())
if err != nil {
fyne.LogError("Preferences load error:", err)
}
}
func (p *preferences) loadFromFile(path string) (err error) {
file, err := os.Open(path) // #nosec
if err != nil {
if os.IsNotExist(err) {
if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
return err
}
return nil
}
return err
}
defer func() {
if r := file.Close(); r != nil && err == nil {
err = r
}
}()
decode := json.NewDecoder(file)
p.prefLock.Lock()
p.loadingInProgress = true
p.prefLock.Unlock()
p.InMemoryPreferences.WriteValues(func(values map[string]interface{}) {
err = decode.Decode(&values)
if err != nil {
return
}
convertLists(values)
})
p.prefLock.Lock()
p.loadingInProgress = false
p.prefLock.Unlock()
return err
}
func newPreferences(app *fyneApp) *preferences {
p := &preferences{}
p.app = app
p.InMemoryPreferences = internal.NewInMemoryPreferences()
// don't load or watch if not setup
if app.uniqueID == "" && app.Metadata().ID == "" {
return p
}
p.needsSaveBeforeExit = true
p.AddChangeListener(func() {
if p != app.prefs {
return
}
p.prefLock.Lock()
shouldIgnoreChange := p.savedRecently || p.loadingInProgress
if p.savedRecently && !p.loadingInProgress {
p.changedDuringSaving = true
}
p.prefLock.Unlock()
if shouldIgnoreChange { // callback after loading file, or too many updates in a row
return
}
err := p.save()
if err != nil {
fyne.LogError("Failed on saving preferences", err)
}
})
p.watch()
return p
}
func convertLists(values map[string]interface{}) {
for k, v := range values {
if items, ok := v.([]interface{}); ok {
if len(items) == 0 {
continue
}
switch items[0].(type) {
case bool:
bools := make([]bool, len(items))
for i, item := range items {
bools[i] = item.(bool)
}
values[k] = bools
case float64:
floats := make([]float64, len(items))
for i, item := range items {
floats[i] = item.(float64)
}
values[k] = floats
case int:
ints := make([]int, len(items))
for i, item := range items {
ints[i] = item.(int)
}
values[k] = ints
case string:
strings := make([]string, len(items))
for i, item := range items {
strings[i] = item.(string)
}
values[k] = strings
}
}
}
}