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e73325edcf
DummyKeyringModule provides a fake string as the JSON credential used to instantiate a GoogleCredential. Of course this would not work and when the metric reporter requests a GoogleCredential in the main thread. This causes the FOSS build to crash on startup, because it defaults to use DummyKeyringModule. This change allows a graceful handling of such an error by wrapping any calls to instantiate a metric reporter in a try block. Note that any attempt to write to stackdriver will still fail, but that happens in a different thread and will not make the whole program crash. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=177183337
67 lines
2.8 KiB
Java
67 lines
2.8 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.module.backend;
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import com.google.appengine.api.LifecycleManager;
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import dagger.Lazy;
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import google.registry.monitoring.metrics.MetricReporter;
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import google.registry.util.FormattingLogger;
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import java.io.IOException;
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import java.security.Security;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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/** Servlet that should handle all requests to our "backend" App Engine module. */
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public final class BackendServlet extends HttpServlet {
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private static final BackendComponent component = DaggerBackendComponent.create();
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private static final BackendRequestHandler requestHandler = component.requestHandler();
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private static final Lazy<MetricReporter> metricReporter = component.metricReporter();
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private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
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@Override
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public void init() {
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Security.addProvider(new BouncyCastleProvider());
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// If metric reporter failed to instantiate for any reason (bad keyring, bad json credential,
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// etc), we log the error but keep the main thread running. Also the shutdown hook will only be
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// registered if metric reporter starts up correctly.
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try {
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metricReporter.get().startAsync().awaitRunning(10, TimeUnit.SECONDS);
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logger.info("Started up MetricReporter");
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LifecycleManager.getInstance()
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.setShutdownHook(
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() -> {
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try {
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metricReporter.get().stopAsync().awaitTerminated(10, TimeUnit.SECONDS);
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logger.info("Shut down MetricReporter");
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} catch (TimeoutException timeoutException) {
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logger.severefmt("Failed to stop MetricReporter: %s", timeoutException);
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}
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});
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} catch (Exception e) {
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logger.severefmt(e, "Failed to initialize MetricReporter.");
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}
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}
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@Override
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public void service(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
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requestHandler.handleRequest(req, rsp);
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}
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}
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