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HandleSession.java
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HandleSession.java
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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you 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 org.openqa.selenium.grid.router;
import static org.openqa.selenium.remote.HttpSessionId.getSessionId;
import static org.openqa.selenium.remote.RemoteTags.SESSION_ID;
import static org.openqa.selenium.remote.RemoteTags.SESSION_ID_EVENT;
import static org.openqa.selenium.remote.http.Contents.asJson;
import static org.openqa.selenium.remote.tracing.Tags.EXCEPTION;
import static org.openqa.selenium.remote.tracing.Tags.HTTP_REQUEST;
import static org.openqa.selenium.remote.tracing.Tags.HTTP_REQUEST_EVENT;
import static org.openqa.selenium.remote.tracing.Tags.HTTP_RESPONSE;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalListener;
import com.google.common.collect.ImmutableMap;
import java.net.URL;
import java.time.Duration;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.NoSuchSessionException;
import org.openqa.selenium.concurrent.GuardedRunnable;
import org.openqa.selenium.grid.data.Session;
import org.openqa.selenium.grid.sessionmap.SessionMap;
import org.openqa.selenium.grid.web.ReverseProxyHandler;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.net.Urls;
import org.openqa.selenium.remote.SessionId;
import org.openqa.selenium.remote.http.ClientConfig;
import org.openqa.selenium.remote.http.HttpClient;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;
import org.openqa.selenium.remote.tracing.AttributeKey;
import org.openqa.selenium.remote.tracing.EventAttribute;
import org.openqa.selenium.remote.tracing.EventAttributeValue;
import org.openqa.selenium.remote.tracing.HttpTracing;
import org.openqa.selenium.remote.tracing.Span;
import org.openqa.selenium.remote.tracing.Status;
import org.openqa.selenium.remote.tracing.Tracer;
class HandleSession implements HttpHandler {
private final Tracer tracer;
private final HttpClient.Factory httpClientFactory;
private final SessionMap sessions;
private final Cache<URL, HttpClient> httpClients;
HandleSession(Tracer tracer, HttpClient.Factory httpClientFactory, SessionMap sessions) {
this.tracer = Require.nonNull("Tracer", tracer);
this.httpClientFactory = Require.nonNull("HTTP client factory", httpClientFactory);
this.sessions = Require.nonNull("Sessions", sessions);
this.httpClients =
CacheBuilder.newBuilder()
.expireAfterAccess(Duration.ofMinutes(1))
.removalListener(
(RemovalListener<URL, HttpClient>) removal -> removal.getValue().close())
.build();
ScheduledExecutorService cleanUpHttpClientsCacheService =
Executors.newSingleThreadScheduledExecutor(
r -> {
Thread thread = new Thread(r);
thread.setDaemon(true);
thread.setName("HandleSession - Clean up http clients cache");
return thread;
});
cleanUpHttpClientsCacheService.scheduleAtFixedRate(
GuardedRunnable.guard(httpClients::cleanUp), 1, 1, TimeUnit.MINUTES);
}
@Override
public HttpResponse execute(HttpRequest req) {
try (Span span = HttpTracing.newSpanAsChildOf(tracer, req, "router.handle_session")) {
Map<String, EventAttributeValue> attributeMap = new HashMap<>();
attributeMap.put(
AttributeKey.HTTP_HANDLER_CLASS.getKey(), EventAttribute.setValue(getClass().getName()));
HTTP_REQUEST.accept(span, req);
HTTP_REQUEST_EVENT.accept(attributeMap, req);
SessionId id =
getSessionId(req.getUri())
.map(SessionId::new)
.orElseThrow(
() -> {
NoSuchSessionException exception =
new NoSuchSessionException("Cannot find session: " + req);
EXCEPTION.accept(attributeMap, exception);
attributeMap.put(
AttributeKey.EXCEPTION_MESSAGE.getKey(),
EventAttribute.setValue(
"Unable to execute request for an existing session: "
+ exception.getMessage()));
span.addEvent(AttributeKey.EXCEPTION_EVENT.getKey(), attributeMap);
return exception;
});
SESSION_ID.accept(span, id);
SESSION_ID_EVENT.accept(attributeMap, id);
try {
HttpTracing.inject(tracer, span, req);
HttpResponse res = loadSessionId(tracer, span, id).call().execute(req);
HTTP_RESPONSE.accept(span, res);
return res;
} catch (Exception e) {
span.setAttribute(AttributeKey.ERROR.getKey(), true);
span.setStatus(Status.CANCELLED);
String errorMessage =
"Unable to execute request for an existing session: " + e.getMessage();
EXCEPTION.accept(attributeMap, e);
attributeMap.put(
AttributeKey.EXCEPTION_MESSAGE.getKey(), EventAttribute.setValue(errorMessage));
span.addEvent(AttributeKey.EXCEPTION_EVENT.getKey(), attributeMap);
if (e instanceof NoSuchSessionException) {
HttpResponse response = new HttpResponse();
response.setStatus(404);
response.setContent(
asJson(
ImmutableMap.of(
"value",
req.getUri(),
"message",
errorMessage,
"error",
"invalid session id")));
return response;
}
Throwable cause = e.getCause();
if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else if (cause != null) {
throw new RuntimeException(errorMessage, cause);
} else if (e instanceof RuntimeException) {
throw (RuntimeException) e;
}
throw new RuntimeException(errorMessage, e);
}
}
}
private Callable<HttpHandler> loadSessionId(Tracer tracer, Span span, SessionId id) {
return span.wrap(
() -> {
Session session = sessions.get(id);
URL url = Urls.fromUri(session.getUri());
ClientConfig config = ClientConfig.defaultConfig().baseUrl(url).withRetries();
HttpClient client = httpClients.get(url, () -> httpClientFactory.createClient(config));
return new ReverseProxyHandler(tracer, client);
});
}
}