apollows

const (
	// EventCloseNormal standard websocket message type
	EventCloseNormal MessageType = 1000

	// EventCloseError standard websocket message type
	EventCloseError MessageType = 1006

	// EventInvalidMessage indicates invalid protocol message
	EventInvalidMessage MessageType = 4400

	// EventUnauthorized indicated attempt to subscribe to an operation before receiving OperationConnectionAck
	EventUnauthorized MessageType = 4401

	// EventInitializationTimeout indicates timeout occurring before client sending OperationConnectionInit
	EventInitializationTimeout MessageType = 4408

	// EventTooManyInitializationRequests indicates receiving more than one OperationConnectionInit
	EventTooManyInitializationRequests MessageType = 4429

	// EventSubscriberAlreadyExists indicates subscribed operation ID already being in use
	// (not yet terminated by either OperationComplete or OperationError)
	EventSubscriberAlreadyExists MessageType = 4409
)

const (
	// OperationConnectionInit [GWS,GTWS]
	// is set by the connecting client to initialize the websocket state with connection params (if any)
	OperationConnectionInit Operation = "connection_init"

	// OperationStart [GWS]
	// client request initiates new operation, each operation may have 0-N OperationData responses before being
	// terminated by either OperationComplete or OperationError
	OperationStart Operation = "start"

	// OperationSubscribe [GTWS]
	// client request initiates new operation, each operation may have 0-N OperationNext responses before being
	// terminated by either OperationComplete or OperationError
	OperationSubscribe Operation = "subscribe"

	// OperationTerminate [GWS]
	// client request to gracefully close the connection, equialent to closing the websocket
	OperationTerminate Operation = "connection_terminate"

	// OperationConnectionError [GWS]
	// server response to unsuccessful OperationConnectionInit attempt
	OperationConnectionError Operation = "connection_error"

	// OperationConnectionAck [GWS,GTWS]
	// server response to successful OperationConnectionInit attempt
	OperationConnectionAck Operation = "connection_ack"

	// OperationData [GWS]
	// server response to previously initiated operation with OperationStart may be multiple within same operation,
	// specifically for subscriptions
	OperationData Operation = "data"

	// OperationNext [GTWS]
	// server response to previously initiated operation with OperationSubscribe may be multiple within same operation,
	// specifically for subscriptions
	OperationNext Operation = "next"

	// OperationError [GWS,GTWS]
	// server response to previously initiated operation with OperationStart/OperationSubscribe
	OperationError Operation = "error"

	// OperationStop [GWS]
	// client request to stop previously initiated operation with OperationStart
	OperationStop Operation = "stop"

	// OperationComplete [GWS,GTWS]
	// GWS: server response indicating previously initiated operation is complete
	// GTWS: server response indicating previously initiated operation is complete
	// GTWS: client request to stop previously initiated operation with OperationSubscribe
	OperationComplete Operation = "complete"

	// OperationKeepAlive [GWS]
	// server response sent periodically to maintain websocket connection open
	OperationKeepAlive Operation = "ka"

	// OperationPing [GTWS]
	// sever/client request for OperationPong response
	OperationPing Operation = "ping"

	// OperationPong [GTWS]
	// sever/client response for OperationPing request
	// can be sent at any time (without prior OperationPing) to maintain wesocket connection
	OperationPong Operation = "pong"
)

const (
	// WebsocketSubprotocolGraphqlWS websocket subprotocol expected by subscriptions-transport-ws implementations
	WebsocketSubprotocolGraphqlWS Protocol = "graphql-ws"

	// WebsocketSubprotocolGraphqlTransportWS websocket subprotocol exepected by graphql-ws implementations
	WebsocketSubprotocolGraphqlTransportWS Protocol = "graphql-transport-ws"
)