extractUpgradeToWebSocket • Akka HTTP (original) (raw)
Signature
def extractUpgradeToWebSocket: Directive1[UpgradeToWebSocket]
Description
This directive is deprecated, see extractWebSocketUpgrade instead.
If you are looking for a building block for Custom Directives to provide the websocket upgrade information to the inner route, we recommend using the WebSocketUpgradeWebSocketUpgrade attribute instead:
Scala
source`import akka.http.scaladsl.model.AttributeKeys.webSocketUpgrade
def echoService: Flow[Message, Message, Any] = Flow[Message] // needed because a noop flow hasn't any buffer that would start processing in tests .buffer(1, OverflowStrategy.backpressure)
def route = path("services") { extractWebSocketUpgrade { upgrade => complete(upgrade.handleMessages(echoService, Some("echo"))) } }
// tests: val wsClient = WSProbe()
// WS creates a WebSocket request for testing WS("/services", wsClient.flow, Nil) ~> route ~> check { expectWebSocketUpgradeWithProtocol { protocol => protocol shouldEqual "echo" wsClient.sendMessage("ping") wsClient.expectMessage("ping") wsClient.sendCompletion() wsClient.expectCompletion() } }`
Java
source`final Flow<Message, Message, NotUsed> echoService = Flow.of(Message.class).buffer(1, OverflowStrategy.backpressure());
final Route websocketRoute = path("services", () -> concat( extractWebSocketUpgrade(upgrade -> complete(upgrade.handleMessagesWith(echoService, "echo")) ) ) );
// tests: // create a testing probe representing the client-side final WSProbe wsClient = WSProbe.create(system(), materializer());
// WS creates a WebSocket request for testing testRoute(websocketRoute) .run(WS(Uri.create("/services"), wsClient.flow(), materializer(), Collections.emptyList())) .assertHeaderExists(SecWebSocketProtocol.create("echo"));
wsClient.sendMessage("ping"); wsClient.expectMessage("ping");
wsClient.sendCompletion(); wsClient.expectCompletion();`
Found an error in this documentation? The source code for this page can be found here. Please feel free to edit and contribute a pull request.