com.google.cloud.dataflow.examples.complete.game.injector.InjectorUtils.java Source code

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Here is the source code for com.google.cloud.dataflow.examples.complete.game.injector.InjectorUtils.java

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * 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 com.google.cloud.dataflow.examples.complete.game.injector;

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.googleapis.util.Utils;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpStatusCodes;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.services.pubsub.Pubsub;
import com.google.api.services.pubsub.PubsubScopes;
import com.google.api.services.pubsub.model.Topic;

import com.google.common.base.Preconditions;

import java.io.IOException;

class InjectorUtils {

    private static final String APP_NAME = "injector";

    /**
     * Builds a new Pubsub client and returns it.
     */
    public static Pubsub getClient(final HttpTransport httpTransport, final JsonFactory jsonFactory)
            throws IOException {
        Preconditions.checkNotNull(httpTransport);
        Preconditions.checkNotNull(jsonFactory);
        GoogleCredential credential = GoogleCredential.getApplicationDefault(httpTransport, jsonFactory);
        if (credential.createScopedRequired()) {
            credential = credential.createScoped(PubsubScopes.all());
        }
        if (credential.getClientAuthentication() != null) {
            System.out.println("\n***Warning! You are not using service account credentials to "
                    + "authenticate.\nYou need to use service account credentials for this example,"
                    + "\nsince user-level credentials do not have enough pubsub quota,\nand so you will run "
                    + "out of PubSub quota very quickly.\nSee "
                    + "https://developers.google.com/identity/protocols/application-default-credentials.");
            System.exit(1);
        }
        HttpRequestInitializer initializer = new RetryHttpInitializerWrapper(credential);
        return new Pubsub.Builder(httpTransport, jsonFactory, initializer).setApplicationName(APP_NAME).build();
    }

    /**
     * Builds a new Pubsub client with default HttpTransport and
     * JsonFactory and returns it.
     */
    public static Pubsub getClient() throws IOException {
        return getClient(Utils.getDefaultTransport(), Utils.getDefaultJsonFactory());
    }

    /**
     * Returns the fully qualified topic name for Pub/Sub.
     */
    public static String getFullyQualifiedTopicName(final String project, final String topic) {
        return String.format("projects/%s/topics/%s", project, topic);
    }

    /**
     * Create a topic if it doesn't exist.
     */
    public static void createTopic(Pubsub client, String fullTopicName) throws IOException {
        try {
            client.projects().topics().get(fullTopicName).execute();
        } catch (GoogleJsonResponseException e) {
            if (e.getStatusCode() == HttpStatusCodes.STATUS_CODE_NOT_FOUND) {
                Topic topic = client.projects().topics().create(fullTopicName, new Topic()).execute();
                System.out.printf("Topic %s was created.\n", topic.getName());
            }
        }
    }
}