how can I disconnect correctly without a data race?

[pashatag]

func (c *Client) Launch(ctx context.Context, username, password string) {
    go func() {
        events := c.client.Events()
        for event := range events {
            switch event.(type) {
            case *steam.ConnectedEvent:
                c.client.Auth.LogOn(&steam.LogOnDetails{
                    Username: username,
                    Password: password,
                })

            case *steam.LoggedOnEvent:
                c.client.Social.SetPersonaState(steamlang.EPersonaState_Online)
                if c.onLoggin != nil {
                    c.onLoggin()
                }

            case *steam.DisconnectedEvent:
                log.Println("disconnected")

            default:
                if c.onRaw != nil {
                    c.onRaw(event)
                }
            }
        }
    }()

    steam.InitializeSteamDirectory()
    c.client.Connect()

    go func() {
        <-ctx.Done()
        c.client.Disconnect()
    }()
}