func ConnectWebsocketSession(opts *DialOptions) (*WebsocketSession, error) {
dialURL, err := url.Parse(opts.BaseURL)
if err != nil {
return nil, err
}
// will be used to set the origin header
originalScheme := dialURL.Scheme
if err := replaceSchemeWithWS(dialURL); err != nil {
return nil, err
}
if err := addMissingPortAndSlash(dialURL); err != nil {
return nil, err
}
serverID := threeDigits()
sessionID := randomStringLength(20)
// Add server_id and session_id to the path.
dialURL.Path += serverID + "/" + sessionID + "/websocket"
requestHeader := http.Header{}
requestHeader.Add("Origin", originalScheme+"://"+dialURL.Host)
ws := websocket.Dialer{
ReadBufferSize: opts.ReadBufferSize,
WriteBufferSize: opts.WriteBufferSize,
}
// if the user passed a timeout, us a dial with a timeout
if opts.Timeout != 0 {
ws.NetDial = func(network, addr string) (net.Conn, error) {
return net.DialTimeout(network, addr, opts.Timeout)
}
// this is used as Deadline inside gorillas dialer method
ws.HandshakeTimeout = opts.Timeout
}
conn, _, err := ws.Dial(dialURL.String(), requestHeader)
if err != nil {
return nil, err
}
session := NewWebsocketSession(conn)
session.id = sessionID
return session, nil
}