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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| package walk | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| "github.com/numtide/treefmt/v2/stats" | ||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| type WatchReader struct { | ||
| root string | ||
| path string | ||
|
|
||
| log *log.Logger | ||
| stats *stats.Stats | ||
|
|
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| eg *errgroup.Group | ||
| watcher *fsnotify.Watcher | ||
| } | ||
|
|
||
| func (f *WatchReader) Read(ctx context.Context, files []*File) (n int, err error) { | ||
| // ensure we record how many files we traversed | ||
| defer func() { | ||
| f.stats.Add(stats.Traversed, n) | ||
| }() | ||
|
|
||
| LOOP: | ||
| // keep filling files up to it's length | ||
| for n < len(files) { | ||
| select { | ||
| // exit early if the context was cancelled | ||
| case <-ctx.Done(): | ||
| err = ctx.Err() | ||
| if err == nil { | ||
| return n, fmt.Errorf("context cancelled: %w", ctx.Err()) | ||
| } | ||
|
|
||
| return n, nil | ||
|
|
||
| // read the next event from the channel | ||
| case event, ok := <-f.watcher.Events: | ||
| if !ok { | ||
| // channel was closed, exit the loop | ||
| err = io.EOF | ||
|
|
||
| break LOOP | ||
| } | ||
|
|
||
| // skip if the event is a chmod or rename event since it doesn't | ||
| // change the file contents | ||
| if event.Has(fsnotify.Chmod) || event.Has(fsnotify.Rename) { | ||
| continue | ||
| } | ||
|
|
||
| file, err := os.Open(event.Name) | ||
| if err != nil { | ||
| return n, fmt.Errorf("failed to stat file %s: %w", event.Name, err) | ||
| } | ||
| defer file.Close() | ||
| info, err := file.Stat() | ||
| if err != nil { | ||
| return n, fmt.Errorf("failed to stat file %s: %w", event.Name, err) | ||
| } | ||
|
|
||
| // determine a path relative to the root | ||
| relPath, err := filepath.Rel(f.root, event.Name) | ||
| if err != nil { | ||
| return n, fmt.Errorf("failed to determine a relative path for %s: %w", event.Name, err) | ||
| } | ||
|
|
||
| // add to the file array and increment n | ||
| files[n] = &File{ | ||
| Path: event.Name, | ||
| RelPath: relPath, | ||
| Info: info, | ||
| } | ||
| n++ | ||
|
|
||
| case err, ok := <-f.watcher.Errors: | ||
| if !ok { | ||
| return n, fmt.Errorf("failed to read from watcher: %w", err) | ||
| } | ||
| f.log.Printf("error: %s", err) | ||
| } | ||
| } | ||
|
|
||
| return n, err | ||
| } | ||
|
|
||
| // Close waits for all watcher processing to complete. | ||
| func (f *WatchReader) Close() error { | ||
| err := f.watcher.Close() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to close watcher: %w", err) | ||
| } | ||
|
|
||
| err = f.eg.Wait() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to wait for processing to complete: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func NewWatchReader( | ||
| root string, | ||
| path string, | ||
| statz *stats.Stats, | ||
| ) (*WatchReader, error) { | ||
| // create an error group for managing the processing loop | ||
| eg := errgroup.Group{} | ||
|
|
||
| watcher, err := fsnotify.NewWatcher() | ||
| if err != nil { | ||
| log.Fatalf("failed to create watcher: %v", err) | ||
| } | ||
|
|
||
| r := WatchReader{ | ||
| root: root, | ||
| path: path, | ||
| log: log.Default(), | ||
| stats: statz, | ||
| eg: &eg, | ||
| watcher: watcher, | ||
| } | ||
|
|
||
| // path is relative to the root, so we create a fully qualified version | ||
| // we also clean the path up in case there are any ../../ components etc. | ||
| fqPath := filepath.Clean(filepath.Join(root, path)) | ||
|
|
||
| // ensure the path is within the root | ||
| if !strings.HasPrefix(fqPath, root) { | ||
| return nil, fmt.Errorf("path '%s' is outside of the root '%s'", fqPath, root) | ||
| } | ||
|
|
||
| // start watching the path | ||
| if err := watcher.Add(fqPath); err != nil { | ||
| return nil, fmt.Errorf("failed to watch path %s: %w", fqPath, err) | ||
| } | ||
|
|
||
| return &r, nil | ||
| } |