tailer struct was incorrect and used incorrect channel

internal/cache/tailer.go

@@ -2,31 +2,32 @@ package cache
 
 import (
 	"io"
+	"log/slog"
 	"os"
 	"time"
 )
 
 type tailer struct {
 	f      *os.File
-	done   <-chan struct{}
 	flight *inFlight
 }
 
 func (t *tailer) Read(p []byte) (int, error) {
 	for {
 		n, err := t.f.Read(p)
+		slog.Debug("tailer read", "n", n, "err", err)
 		if n > 0 {
 			return n, nil
 		}
 		if err == io.EOF {
 			select {
-			case <-t.done:
+			case <-t.flight.done:
 				if t.flight.err != nil {
 					return 0, t.flight.err
 				}
 				return t.f.Read(p) // send remainiing bytes
-			default:
-				time.Sleep(50 * time.Millisecond)
+			case <-time.After(50 * time.Millisecond):
+				slog.Debug("tailer waiting for more data")
 				continue
 			}
 		}