242 lines
8.7 KiB
Java
242 lines
8.7 KiB
Java
/*
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* Copyright 2018, Google LLC.
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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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*/
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package hipstershop;
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import com.google.common.collect.ImmutableMap;
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import hipstershop.Demo.Ad;
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import hipstershop.Demo.AdRequest;
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import hipstershop.Demo.AdResponse;
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import io.grpc.Server;
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import io.grpc.ServerBuilder;
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import io.grpc.StatusRuntimeException;
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import io.grpc.health.v1.HealthCheckResponse.ServingStatus;
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import io.grpc.stub.StreamObserver;
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import io.grpc.services.*;
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import io.opencensus.common.Duration;
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import io.opencensus.common.Scope;
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import io.opencensus.contrib.grpc.metrics.RpcViews;
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import io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector;
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import io.opencensus.exporter.trace.logging.LoggingTraceExporter;
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import io.opencensus.exporter.stats.stackdriver.StackdriverStatsConfiguration;
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import io.opencensus.exporter.stats.stackdriver.StackdriverStatsExporter;
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import io.opencensus.exporter.trace.stackdriver.StackdriverTraceConfiguration;
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import io.opencensus.exporter.trace.stackdriver.StackdriverTraceExporter;
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import io.opencensus.trace.AttributeValue;
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import io.opencensus.trace.Span;
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import io.opencensus.trace.SpanBuilder;
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import io.opencensus.trace.Tracer;
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import io.opencensus.trace.Tracing;
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import io.opencensus.trace.samplers.Samplers;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class AdService {
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private static final Logger logger = Logger.getLogger(AdService.class.getName());
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private static final Tracer tracer = Tracing.getTracer();
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private int MAX_ADS_TO_SERVE = 2;
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private Server server;
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private HealthStatusManager healthMgr;
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static final AdService service = new AdService();
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private void start() throws IOException {
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int port = Integer.parseInt(System.getenv("PORT"));
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healthMgr = new HealthStatusManager();
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server = ServerBuilder.forPort(port).addService(new AdServiceImpl())
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.addService(healthMgr.getHealthService()).build().start();
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logger.info("Ad Service started, listening on " + port);
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Runtime.getRuntime()
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.addShutdownHook(
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new Thread() {
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@Override
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public void run() {
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// Use stderr here since the logger may have been reset by its JVM shutdown hook.
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System.err.println("*** shutting down gRPC ads server since JVM is shutting down");
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AdService.this.stop();
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System.err.println("*** server shut down");
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}
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});
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healthMgr.setStatus("", ServingStatus.SERVING);
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}
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private void stop() {
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if (server != null) {
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healthMgr.clearStatus("");
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server.shutdown();
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}
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}
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static class AdServiceImpl extends hipstershop.AdServiceGrpc.AdServiceImplBase {
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/**
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* Retrieves ads based on context provided in the request {@code AdRequest}.
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*
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* @param req the request containing context.
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* @param responseObserver the stream observer which gets notified with the value of
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* {@code AdResponse}
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*/
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@Override
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public void getAds(AdRequest req, StreamObserver<AdResponse> responseObserver) {
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AdService service = AdService.getInstance();
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Span parentSpan = tracer.getCurrentSpan();
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SpanBuilder spanBuilder =
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tracer
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.spanBuilderWithExplicitParent("Retrieve Ads", parentSpan)
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.setRecordEvents(true)
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.setSampler(Samplers.alwaysSample());
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try (Scope scope = spanBuilder.startScopedSpan()) {
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Span span = tracer.getCurrentSpan();
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span.putAttribute("method", AttributeValue.stringAttributeValue("getAds"));
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List<Ad> ads = new ArrayList<>();
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logger.info("received ad request (context_words=" + req.getContextKeysCount() + ")");
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if (req.getContextKeysCount() > 0) {
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span.addAnnotation(
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"Constructing Ads using context",
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ImmutableMap.of(
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"Context Keys",
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AttributeValue.stringAttributeValue(req.getContextKeysList().toString()),
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"Context Keys length",
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AttributeValue.longAttributeValue(req.getContextKeysCount())));
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for (int i = 0; i < req.getContextKeysCount(); i++) {
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Ad ad = service.getAdsByKey(req.getContextKeys(i));
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if (ad != null) {
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ads.add(ad);
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}
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}
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} else {
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span.addAnnotation("No Context provided. Constructing random Ads.");
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ads = service.getDefaultAds();
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}
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if (ads.isEmpty()) {
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// Serve default ads.
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span.addAnnotation("No Ads found based on context. Constructing random Ads.");
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ads = service.getDefaultAds();
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}
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AdResponse reply = AdResponse.newBuilder().addAllAds(ads).build();
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responseObserver.onNext(reply);
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responseObserver.onCompleted();
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} catch (StatusRuntimeException e) {
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logger.log(Level.WARNING, "GetAds Failed", e.getStatus());
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return;
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}
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}
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}
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static final HashMap<String, Ad> cacheMap = new HashMap<String, Ad>();
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Ad getAdsByKey(String key) {
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return cacheMap.get(key);
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}
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public List<Ad> getDefaultAds() {
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List<Ad> ads = new ArrayList<>(MAX_ADS_TO_SERVE);
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Object[] keys = cacheMap.keySet().toArray();
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for (int i=0; i<MAX_ADS_TO_SERVE; i++) {
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ads.add(cacheMap.get(keys[new Random().nextInt(keys.length)]));
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}
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return ads;
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}
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public static AdService getInstance() {
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return service;
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}
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/** Await termination on the main thread since the grpc library uses daemon threads. */
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private void blockUntilShutdown() throws InterruptedException {
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if (server != null) {
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server.awaitTermination();
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}
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}
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static void initializeAds() {
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cacheMap.put("camera", Ad.newBuilder().setRedirectUrl( "/product/2ZYFJ3GM2N")
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.setText("Film camera for sale. 50% off.").build());
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cacheMap.put("bike", Ad.newBuilder().setRedirectUrl("/product/9SIQT8TOJO")
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.setText("City Bike for sale. 10% off.").build());
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cacheMap.put("kitchen", Ad.newBuilder().setRedirectUrl("/product/1YMWWN1N4O")
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.setText("Home Barista kitchen kit for sale. Buy one, get second kit for free").build());
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logger.info("Default Ads initialized");
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}
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public static void initStackdriver() {
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logger.info("Initialize StackDriver");
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// Registers all RPC views.
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RpcViews.registerAllViews();
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// Registers logging trace exporter.
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LoggingTraceExporter.register();
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long sleepTime = 10; /* seconds */
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int maxAttempts = 3;
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for (int i=0; i<maxAttempts; i++) {
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try {
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StackdriverTraceExporter.createAndRegister(
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StackdriverTraceConfiguration.builder().build());
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StackdriverStatsExporter.createAndRegister(
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StackdriverStatsConfiguration.builder()
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.setExportInterval(Duration.create(15, 0))
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.build());
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} catch (Exception e) {
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if (i==(maxAttempts-1)) {
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logger.log(Level.WARNING, "Failed to register Stackdriver Exporter." +
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" Tracing and Stats data will not reported to Stackdriver. Error message: " + e
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.toString());
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} else {
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logger.info("Attempt to register Stackdriver Exporter in " + sleepTime + " seconds ");
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try {
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Thread.sleep(TimeUnit.SECONDS.toMillis(sleepTime));
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} catch (Exception se) {
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logger.log(Level.WARNING, "Exception while sleeping" + se.toString());
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}
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}
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}
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}
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logger.info("StackDriver initialization complete.");
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}
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/** Main launches the server from the command line. */
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public static void main(String[] args) throws IOException, InterruptedException {
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// Add final keyword to pass checkStyle.
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initializeAds();
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new Thread( new Runnable() {
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public void run(){
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initStackdriver();
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}
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}).start();
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// Register Prometheus exporters and export metrics to a Prometheus HTTPServer.
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PrometheusStatsCollector.createAndRegister();
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// Start the RPC server. You shouldn't see any output from gRPC before this.
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logger.info("AdService starting.");
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final AdService service = AdService.getInstance();
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service.start();
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service.blockUntilShutdown();
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}
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} |