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Helidon MP integration with Tyrus
/*
* Copyright (c) 2022, 2023 Oracle and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.helidon.microprofile.tyrus;
import java.lang.System.Logger.Level;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.stream.Collectors;
import io.helidon.common.Weight;
import io.helidon.common.Weighted;
import io.helidon.common.buffers.BufferData;
import io.helidon.common.buffers.DataWriter;
import io.helidon.common.uri.UriQuery;
import io.helidon.http.DirectHandler;
import io.helidon.http.HeaderNames;
import io.helidon.http.HeaderValues;
import io.helidon.http.HttpPrologue;
import io.helidon.http.RequestException;
import io.helidon.http.WritableHeaders;
import io.helidon.webserver.ConnectionContext;
import io.helidon.webserver.spi.ServerConnection;
import io.helidon.webserver.websocket.WsConfig;
import io.helidon.webserver.websocket.WsUpgrader;
import jakarta.enterprise.inject.spi.CDI;
import jakarta.websocket.DeploymentException;
import jakarta.websocket.Extension;
import jakarta.websocket.server.ServerEndpointConfig;
import org.glassfish.tyrus.core.RequestContext;
import org.glassfish.tyrus.core.TyrusUpgradeResponse;
import org.glassfish.tyrus.core.TyrusWebSocketEngine;
import org.glassfish.tyrus.server.TyrusServerContainer;
import org.glassfish.tyrus.spi.WebSocketEngine;
/**
* Tyrus connection upgrade provider.
*/
@Weight(Weighted.DEFAULT_WEIGHT + 100) // higher than base class
public class TyrusUpgrader extends WsUpgrader {
private static final System.Logger LOGGER = System.getLogger(TyrusUpgrader.class.getName());
private final EngineHolder engine = new EngineHolder();
private TyrusUpgrader(WsConfig origins) {
super(origins);
}
/**
* Create a new configured instance of Tyrus upgrader.
*
* @param config configuration of WebSocket
* @return a new HTTP/1 upgrader
*/
public static TyrusUpgrader create(WsConfig config) {
return new TyrusUpgrader(config);
}
@Override
public ServerConnection upgrade(ConnectionContext ctx, HttpPrologue prologue, WritableHeaders headers) {
// Check required header
String wsKey;
if (headers.contains(WS_KEY)) {
wsKey = headers.get(WS_KEY).get();
} else {
// this header is required
return null;
}
// Verify protocol version
String version;
if (headers.contains(WS_VERSION)) {
version = headers.get(WS_VERSION).get();
} else {
version = SUPPORTED_VERSION;
}
if (!SUPPORTED_VERSION.equals(version)) {
throw RequestException.builder()
.type(DirectHandler.EventType.BAD_REQUEST)
.message("Unsupported WebSocket Version")
.header(SUPPORTED_VERSION_HEADER)
.build();
}
// Initialize path and queryString
String path = prologue.uriPath().path();
UriQuery query = prologue.query();
// Check if this a Tyrus route exists
TyrusRouting routing = ctx.router()
.routing(TyrusRouting.class, null);
if (routing == null) {
return null;
}
TyrusRoute route = routing.findRoute(prologue);
if (route == null) {
return null;
}
// Validate origin
if (!anyOrigin()) {
if (headers.contains(HeaderNames.ORIGIN)) {
String origin = headers.get(HeaderNames.ORIGIN).get();
if (!origins().contains(origin)) {
throw RequestException.builder()
.message("Invalid Origin")
.type(DirectHandler.EventType.FORBIDDEN)
.build();
}
}
}
// Protocol handshake with Tyrus
WebSocketEngine.UpgradeInfo upgradeInfo = protocolHandshake(routing, headers, query, path);
// todo support subprotocols (must be provided by route)
// Sec-WebSocket-Protocol: sub-protocol (list provided in PROTOCOL header, separated by comma space
DataWriter dataWriter = ctx.dataWriter();
String switchingProtocols = SWITCHING_PROTOCOL_PREFIX + hash(ctx, wsKey) + SWITCHING_PROTOCOLS_SUFFIX;
dataWriter.write(BufferData.create(switchingProtocols.getBytes(StandardCharsets.US_ASCII)));
if (LOGGER.isLoggable(Level.DEBUG)) {
LOGGER.log(Level.DEBUG, "Upgraded to websocket version " + version);
}
return new TyrusConnection(ctx, upgradeInfo);
}
@Override
protected Set origins() {
return super.origins();
}
WebSocketEngine.UpgradeInfo protocolHandshake(TyrusRouting routing,
WritableHeaders headers,
UriQuery uriQuery,
String path) {
LOGGER.log(Level.DEBUG, "Initiating WebSocket handshake with Tyrus...");
// Create Tyrus request context, copy request headers and query params
Map paramsMap = new HashMap<>();
for (String name : uriQuery.names()) {
paramsMap.put(name, uriQuery.all(name).toArray(new String[0]));
}
RequestContext requestContext = RequestContext.Builder.create()
.requestURI(URI.create(path)) // excludes context path
.queryString(uriQuery.value())
.parameterMap(paramsMap)
.build();
headers.forEach(e -> requestContext.getHeaders().put(e.name(), List.of(e.values())));
// Use Tyrus to process a WebSocket upgrade request
final TyrusUpgradeResponse upgradeResponse = new TyrusUpgradeResponse();
final WebSocketEngine.UpgradeInfo upgradeInfo = engine.get(routing).upgrade(requestContext, upgradeResponse);
// Map Tyrus response headers back to Helidon
upgradeResponse.getHeaders()
.forEach((key, value) -> headers.add(
HeaderValues.create(
HeaderNames.create(key, key.toLowerCase(Locale.ROOT)),
value)));
return upgradeInfo;
}
// to initialize Tyrus only once
private static final class EngineHolder {
private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
private volatile WebSocketEngine engine;
WebSocketEngine get(TyrusRouting routing) {
try {
rwLock.readLock().lock();
if (engine != null) {
return engine;
}
} finally {
rwLock.readLock().unlock();
}
// was not there
try {
rwLock.writeLock().lock();
if (engine != null) {
// competing thread managed to obtain the write lock before us and initailized it
return engine;
}
engine = createTyrusEngine(routing);
return engine;
} finally {
rwLock.writeLock().unlock();
}
}
private WebSocketEngine createTyrusEngine(TyrusRouting routing) {
TyrusCdiExtension extension = CDI.current().select(TyrusCdiExtension.class).get();
Objects.requireNonNull(extension);
TyrusServerContainer tyrusServerContainer = initializeTyrus(routing);
return tyrusServerContainer.getWebSocketEngine();
}
private TyrusServerContainer initializeTyrus(TyrusRouting tyrusRouting) {
Set> allEndpointClasses = tyrusRouting.routes()
.stream()
.map(TyrusRoute::endpointClass)
.collect(Collectors.toSet());
TyrusServerContainer tyrusServerContainer = new TyrusServerContainer(allEndpointClasses) {
private final WebSocketEngine engine =
TyrusWebSocketEngine.builder(this).build();
@Override
public void register(Class endpointClass) {
throw new UnsupportedOperationException("Cannot register endpoint class");
}
@Override
public void register(ServerEndpointConfig serverEndpointConfig) {
throw new UnsupportedOperationException("Cannot register ServerEndpointConfig");
}
@Override
public Set getInstalledExtensions() {
return tyrusRouting.extensions();
}
@Override
public WebSocketEngine getWebSocketEngine() {
return engine;
}
};
// Register classes with context path "/"
WebSocketEngine engine = tyrusServerContainer.getWebSocketEngine();
tyrusRouting.routes().forEach(route -> {
try {
if (route.serverEndpointConfig() != null) {
LOGGER.log(Level.DEBUG, () -> "Registering ws endpoint "
+ route.path()
+ route.serverEndpointConfig().getPath());
engine.register(route.serverEndpointConfig(), route.path());
} else {
LOGGER.log(Level.DEBUG, () -> "Registering annotated ws endpoint " + route.path());
engine.register(route.endpointClass(), route.path());
}
} catch (DeploymentException e) {
throw new RuntimeException(e);
}
});
return tyrusServerContainer;
}
}
}