Method openWriter

logging.go:250–261

openWriter opens a writer using opener, and returns true if the writer is new, or false if the writer already exists.

(opener WriterOpener)

// openWriter opens a writer using opener, and returns true if
// the writer is new, or false if the writer already exists.
func (logging *Logging) openWriter(opener WriterOpener) (io.WriteCloser, bool, error) {
	key := opener.WriterKey()
	writer, loaded, err := writers.LoadOrNew(key, func() (Destructor, error) {
		w, err := opener.OpenWriter()
		return writerDestructor{w}, err
	})
	if err != nil {
		return nil, false, err
	}
	logging.writerKeys = append(logging.writerKeys, key)
	return writer.(io.WriteCloser), !loaded, nil
}

// WriterOpener is a module that can open a log writer.
// It can return a human-readable string representation