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disk.go
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disk.go
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package disk
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"github.com/fatih/color"
"github.com/fsnotify/fsnotify"
"github.com/yaoapp/kun/log"
)
// Disk disk
type Disk struct {
root string // the app root
watched sync.Map
}
var defaultPatterns = []string{"*.yao", "*.json", "*.jsonc", "*.yaml", "*.so", "*.dll", "*.js", "*.py", "*.ts", "*.wasm"}
var ignoreWatchPatterns = []string{"/public", "/data", "/db"}
// Open the application
func Open(root string) (*Disk, error) {
// with home dir
if strings.HasPrefix(root, "~") {
homedir, err := os.UserHomeDir()
if err != nil {
return nil, fmt.Errorf("[disk.Open] %s %s", root, err.Error())
}
root = homedir + strings.TrimPrefix(root, "~")
}
path, err := filepath.Abs(root)
if err != nil {
return nil, fmt.Errorf("[disk.Open] %s %s", root, err.Error())
}
if _, err := os.Stat(path); err != nil {
return nil, fmt.Errorf("[disk.Open] %s %s", root, err.Error())
}
return &Disk{root: path, watched: sync.Map{}}, nil
}
// Walk traverse folders and read file contents
func (disk *Disk) Walk(root string, handler func(root, file string, isdir bool) error, patterns ...string) error {
rootAbs, err := disk.abs(root)
if err != nil {
return err
}
if patterns == nil {
patterns = defaultPatterns
}
return filepath.Walk(rootAbs, func(filename string, info os.FileInfo, err error) error {
if err != nil {
log.Error("[disk.Walk] %s %s", filename, err.Error())
return err
}
isdir := info.IsDir()
if patterns != nil && !isdir && len(patterns) > 0 && patterns[0] != "-" {
notmatched := true
basname := filepath.Base(filename)
for _, pattern := range patterns {
if matched, _ := filepath.Match(pattern, basname); matched {
notmatched = false
break
}
}
if notmatched {
return nil
}
}
name := strings.TrimPrefix(filename, rootAbs)
if name == "" && isdir {
name = string(os.PathSeparator)
}
if strings.HasPrefix(name, ".") || strings.HasPrefix(name, "/.") || strings.HasPrefix(name, "\\.") {
return nil
}
if !isdir {
name = filepath.Join(root, name)
}
err = handler(root, name, isdir)
if err != nil {
log.Error("[disk.Walk] %s %s", filename, err.Error())
return err
}
return nil
})
}
// Read the file content
func (disk *Disk) Read(name string) ([]byte, error) {
file, err := disk.abs(name)
if err != nil {
return nil, err
}
return os.ReadFile(file)
}
// Write the file content
func (disk *Disk) Write(name string, data []byte) error {
file, err := disk.abs(name)
if err != nil {
return err
}
path := filepath.Dir(file)
os.MkdirAll(path, os.ModePerm)
return os.WriteFile(file, data, 0644)
}
// Remove the file
func (disk *Disk) Remove(name string) error {
file, err := disk.abs(name)
if err != nil {
return err
}
return os.RemoveAll(file)
}
// Exists check if the file is exists
func (disk *Disk) Exists(name string) (bool, error) {
file, err := disk.abs(name)
if err != nil {
return false, err
}
_, err = os.Stat(file)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
return true, nil
}
// Watch the file changes
func (disk *Disk) Watch(handler func(event string, name string), interrupt chan uint8) error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
defer watcher.Close()
shutdown := make(chan bool, 1)
// Add path
err = disk.Walk("/", func(root, file string, isdir bool) error {
if isdir {
for _, pattern := range ignoreWatchPatterns {
if matched, _ := filepath.Match(pattern, file); matched {
return nil
}
}
filename, err := disk.abs(file)
if err != nil {
return err
}
err = watcher.Add(filename)
if err != nil {
return err
}
log.Info("[Watch] Watching: %s", filename)
disk.watched.Store(filename, true)
}
return nil
})
if err != nil {
return err
}
go func() {
for {
select {
case <-shutdown:
log.Info("[Watch] handler exit")
return
case event, ok := <-watcher.Events:
if !ok {
interrupt <- 1
return
}
basname := filepath.Base(event.Name)
isdir := true
if strings.Contains(basname, ".") {
isdir = false
}
ignore := true
if !isdir {
for _, pattern := range defaultPatterns {
if matched, _ := filepath.Match(pattern, basname); matched {
ignore = false
}
}
if ignore {
log.Info("[Watch] IGNORE %s", strings.TrimPrefix(event.Name, disk.root))
break
}
}
events := strings.Split(event.Op.String(), "|")
for _, eventType := range events {
// ADD / REMOVE Watching dir
if isdir {
switch eventType {
case "CREATE":
log.Info("[Watch] Watching: %s", strings.TrimPrefix(event.Name, disk.root))
watcher.Add(event.Name)
disk.watched.Store(event.Name, true)
break
case "REMOVE":
log.Info("[Watch] Unwatching: %s", strings.TrimPrefix(event.Name, disk.root))
watcher.Remove(event.Name)
disk.watched.Delete(event.Name)
break
}
continue
}
file := strings.TrimPrefix(event.Name, disk.root)
log.Info("[Watch] %s %s", eventType, file)
handler(eventType, file)
}
break
case err, ok := <-watcher.Errors:
if !ok {
interrupt <- 2
return
}
log.Error("[Watch] Error: %s", err.Error())
break
}
}
}()
for {
select {
case code := <-interrupt:
shutdown <- true
log.Info("[Watch] Exit(%d)", code)
fmt.Println(color.YellowString("[Watch] Exit(%d)", code))
return nil
}
}
}
func (disk *Disk) abs(root string) (string, error) {
root = filepath.Join(disk.root, root)
root, err := filepath.Abs(root)
if err != nil {
return "", err
}
return root, nil
}