sockjs

type Options struct {
	// Transports which don't support cross-domain communication natively ('eventsource' to name one) use an iframe trick.
	// A simple page is served from the SockJS server (using its foreign domain) and is placed in an invisible iframe.
	// Code run from this iframe doesn't need to worry about cross-domain issues, as it's being run from domain local to the SockJS server.
	// This iframe also does need to load SockJS javascript client library, and this option lets you specify its url (if you're unsure,
	// point it to the latest minified SockJS client release, this is the default). You must explicitly specify this url on the server
	// side for security reasons - we don't want the possibility of running any foreign javascript within the SockJS domain (aka cross site scripting attack).
	// Also, sockjs javascript library is probably already cached by the browser - it makes sense to reuse the sockjs url you're using in normally.
	SockJSURL string
	// Most streaming transports save responses on the client side and don't free memory used by delivered messages.
	// Such transports need to be garbage-collected once in a while. `response_limit` sets a minimum number of bytes that can be send
	// over a single http streaming request before it will be closed. After that client needs to open new request.
	// Setting this value to one effectively disables streaming and will make streaming transports to behave like polling transports.
	// The default value is 128K.
	ResponseLimit uint32
	// Some load balancers don't support websockets. This option can be used to disable websockets support by the server. By default websockets are enabled.
	Websocket bool
	// This option can be used to enable raw websockets support by the server. By default raw websockets are disabled.
	RawWebsocket bool
	// Provide a custom Upgrader for Websocket connections to enable features like compression.
	// See https://godoc.org/github.com/gorilla/websocket#Upgrader for more details.
	WebsocketUpgrader *websocket.Upgrader
	// WebsocketWriteTimeout is a custom write timeout for Websocket underlying network connection.
	// A zero value means writes will not time out.
	WebsocketWriteTimeout time.Duration
	// In order to keep proxies and load balancers from closing long running http requests we need to pretend that the connection is active
	// and send a heartbeat packet once in a while. This setting controls how often this is done.
	// By default a heartbeat packet is sent every 25 seconds.
	HeartbeatDelay time.Duration
	// The server closes a session when a client receiving connection have not been seen for a while.
	// This delay is configured by this setting.
	// By default the session is closed when a receiving connection wasn't seen for 5 seconds.
	DisconnectDelay time.Duration
	// Some hosting providers enable sticky sessions only to requests that have JSessionID cookie set.
	// This setting controls if the server should set this cookie to a dummy value.
	// By default setting JSessionID cookie is disabled. More sophisticated behaviour can be achieved by supplying a function.
	JSessionID func(http.ResponseWriter, *http.Request)
	// CORS origin to be set on outgoing responses. If set to the empty string, it will default to the
	// incoming `Origin` header, or "*" if the Origin header isn't set.
	Origin string
	// CheckOrigin allows to dynamically decide whether server should set CORS
	// headers or not in case of XHR requests. When true returned CORS will be
	// configured with allowed origin equal to incoming `Origin` header, or "*"
	// if the request Origin header isn't set. When false returned CORS headers
	// won't be set at all. If this function is nil then Origin option above will
	// be taken into account.
	CheckOrigin func(*http.Request) bool
}

type Session interface {
	// Id returns a session id
	ID() string
	// Request returns the first http request
	Request() *http.Request
	// Recv reads one text frame from session
	Recv() (string, error)
	// Send sends one text frame to session
	Send(string) error
	// Close closes the session with provided code and reason.
	Close(status uint32, reason string) error
	//Gets the state of the session. SessionOpening/SessionActive/SessionClosing/SessionClosed;
	GetSessionState() SessionState
}

type SessionState uint32