chore: import upstream snapshot with attribution

pkg/log/io.go

@@ -0,0 +1,61 @@
+package log
+
+import (
+	"io"
+
+	"log/slog"
+)
+
+// IOLogger is a wrapper around io.Reader and io.Writer that can be used
+// to log the data being read and written from the underlying streams
+type IOLogger struct {
+	io.ReadWriteCloser
+
+	reader io.Reader
+	writer io.Writer
+	logger *slog.Logger
+}
+
+// NewIOLogger creates a new IOLogger instance
+func NewIOLogger(r io.Reader, w io.Writer, logger *slog.Logger) *IOLogger {
+	return &IOLogger{
+		reader: r,
+		writer: w,
+		logger: logger,
+	}
+}
+
+// Read reads data from the underlying io.Reader and logs it.
+func (l *IOLogger) Read(p []byte) (n int, err error) {
+	if l.reader == nil {
+		return 0, io.EOF
+	}
+	n, err = l.reader.Read(p)
+	if n > 0 {
+		l.logger.Info("[stdin]: received bytes", "count", n, "data", string(p[:n]))
+	}
+	return n, err
+}
+
+// Write writes data to the underlying io.Writer and logs it.
+func (l *IOLogger) Write(p []byte) (n int, err error) {
+	if l.writer == nil {
+		return 0, io.ErrClosedPipe
+	}
+	l.logger.Info("[stdout]: sending bytes", "count", len(p), "data", string(p))
+	return l.writer.Write(p)
+}
+
+func (l *IOLogger) Close() error {
+	var errReader, errWriter error
+	if closer, ok := l.reader.(io.Closer); ok {
+		errReader = closer.Close()
+	}
+	if closer, ok := l.writer.(io.Closer); ok {
+		errWriter = closer.Close()
+	}
+	if errReader != nil {
+		return errReader
+	}
+	return errWriter
+}