Method NextWriter

conn.go:518–530

NextWriter returns a writer for the next message to send. The writer's Close method flushes the complete message to the network. There can be at most one open writer on a connection. NextWriter closes the previous writer if the application has not already done so. All message types (TextMessage, B

(messageType int)

// All message types (TextMessage, BinaryMessage, CloseMessage, PingMessage and
// PongMessage) are supported.
func (c *Conn) NextWriter(messageType int) (io.WriteCloser, error) {
	var mw messageWriter
	if err := c.beginMessage(&mw, messageType); err != nil {
		return nil, err
	}
	c.writer = &mw
	if c.newCompressionWriter != nil && c.enableWriteCompression && isData(messageType) {
		w := c.newCompressionWriter(c.writer, c.compressionLevel)
		mw.compress = true
		c.writer = w
	}
	return c.writer, nil
}

type messageWriter struct {
	c         *Conn