使用 Cloud Storage 提取功能创建主题

创建从 Cloud Storage 存储桶提取数据的 Pub/Sub 主题

代码示例

C++

在尝试此示例之前，请按照C++ Pub/Sub 快速入门： 客户端库。 有关详情，请参阅 Pub/Sub C++ API 参考文档。

如需向 Pub/Sub 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。

namespace pubsub = ::google::cloud::pubsub;
namespace pubsub_admin = ::google::cloud::pubsub_admin;
[](pubsub_admin::TopicAdminClient client, std::string project_id,
   std::string topic_id, std::string bucket, std::string const& input_format,
   std::string text_delimiter, std::string match_glob,
   std::string const& minimum_object_create_time) {
  google::pubsub::v1::Topic request;
  request.set_name(
      pubsub::Topic(std::move(project_id), std::move(topic_id)).FullName());
  auto& cloud_storage = *request.mutable_ingestion_data_source_settings()
                             ->mutable_cloud_storage();
  cloud_storage.set_bucket(std::move(bucket));
  if (input_format == "text") {
    cloud_storage.mutable_text_format()->set_delimiter(
        std::move(text_delimiter));
  } else if (input_format == "avro") {
    cloud_storage.mutable_avro_format();
  } else if (input_format == "pubsub_avro") {
    cloud_storage.mutable_pubsub_avro_format();
  } else {
    std::cout << "input_format must be in ('text', 'avro', 'pubsub_avro'); "
                 "got value: "
              << input_format << std::endl;
    return;
  }

  if (!match_glob.empty()) {
    cloud_storage.set_match_glob(std::move(match_glob));
  }

  if (!minimum_object_create_time.empty()) {
    google::protobuf::Timestamp timestamp;
    if (!google::protobuf::util::TimeUtil::FromString(
            minimum_object_create_time,
            cloud_storage.mutable_minimum_object_create_time())) {
      std::cout << "Invalid minimum object create time: "
                << minimum_object_create_time << std::endl;
    }
  }

  auto topic = client.CreateTopic(request);
  // Note that kAlreadyExists is a possible error when the library retries.
  if (topic.status().code() == google::cloud::StatusCode::kAlreadyExists) {
    std::cout << "The topic already exists\n";
    return;
  }
  if (!topic) throw std::move(topic).status();

  std::cout << "The topic was successfully created: " << topic->DebugString()
            << "\n";
}

Go

在尝试此示例之前，请按照 Pub/Sub 快速入门：使用客户端库中的 Go 设置说明进行操作。 有关详情，请参阅 Pub/Sub Go API 参考文档。

如需向 Pub/Sub 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/pubsub"
)

func createTopicWithCloudStorageIngestion(w io.Writer, projectID, topicID, bucket, matchGlob, minimumObjectCreateTime string) error {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	// bucket := "my-bucket"
	// matchGlob := "**.txt"
	// minimumObjectCreateTime := "2006-01-02T15:04:05Z"

	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	minCreateTime, err := time.Parse(time.RFC3339, minimumObjectCreateTime)
	if err != nil {
		return err
	}

	cfg := &pubsub.TopicConfig{
		IngestionDataSourceSettings: &pubsub.IngestionDataSourceSettings{
			Source: &pubsub.IngestionDataSourceCloudStorage{
				Bucket: bucket,
				// Alternatively, can be Avro or PubSubAvro formats. See
				InputFormat: &pubsub.IngestionDataSourceCloudStorageTextFormat{
					Delimiter: ",",
				},
				MatchGlob:               matchGlob,
				MinimumObjectCreateTime: minCreateTime,
			},
		},
	}
	t, err := client.CreateTopicWithConfig(ctx, topicID, cfg)
	if err != nil {
		return fmt.Errorf("CreateTopic: %w", err)
	}
	fmt.Fprintf(w, "Cloud storage topic created: %v\n", t)
	return nil
}

Java

在尝试此示例之前，请按照 Pub/Sub 快速入门：使用客户端库中的 Java 设置说明进行操作。 如需了解详情，请参阅 Pub/Sub Java API 参考文档。

如需向 Pub/Sub 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。

import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.protobuf.util.Timestamps;
import com.google.pubsub.v1.IngestionDataSourceSettings;
import com.google.pubsub.v1.Topic;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;
import java.text.ParseException;

public class CreateTopicWithCloudStorageIngestionExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";
    // Cloud Storage ingestion settings.
    // bucket and inputFormat are required arguments.
    String bucket = "your-bucket";
    String inputFormat = "text";
    String textDelimiter = "\n";
    String matchGlob = "**.txt";
    String minimumObjectCreateTime = "YYYY-MM-DDThh:mm:ssZ";

    createTopicWithCloudStorageIngestionExample(
        projectId, topicId, bucket, inputFormat, textDelimiter, matchGlob, minimumObjectCreateTime);
  }

  public static void createTopicWithCloudStorageIngestionExample(
      String projectId,
      String topicId,
      String bucket,
      String inputFormat,
      String textDelimiter,
      String matchGlob,
      String minimumObjectCreateTime)
      throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      IngestionDataSourceSettings.CloudStorage.Builder cloudStorageBuilder =
          IngestionDataSourceSettings.CloudStorage.newBuilder().setBucket(bucket);
      switch (inputFormat) {
        case "text":
          cloudStorageBuilder.setTextFormat(
              IngestionDataSourceSettings.CloudStorage.TextFormat.newBuilder()
                  .setDelimiter(textDelimiter)
                  .build());
          break;
        case "avro":
          cloudStorageBuilder.setAvroFormat(
              IngestionDataSourceSettings.CloudStorage.AvroFormat.getDefaultInstance());
          break;
        case "pubsub_avro":
          cloudStorageBuilder.setPubsubAvroFormat(
              IngestionDataSourceSettings.CloudStorage.PubSubAvroFormat.getDefaultInstance());
          break;
        default:
          throw new IllegalArgumentException(
              "inputFormat must be in ('text', 'avro', 'pubsub_avro'); got value: " + inputFormat);
      }

      if (matchGlob != null && !matchGlob.isEmpty()) {
        cloudStorageBuilder.setMatchGlob(matchGlob);
      }

      if (minimumObjectCreateTime != null && !minimumObjectCreateTime.isEmpty()) {
        try {
          cloudStorageBuilder.setMinimumObjectCreateTime(Timestamps.parse(minimumObjectCreateTime));
        } catch (ParseException e) {
          System.err.println("Unable to parse timestamp: " + minimumObjectCreateTime);
        }
      }

      IngestionDataSourceSettings ingestionDataSourceSettings =
          IngestionDataSourceSettings.newBuilder()
              .setCloudStorage(cloudStorageBuilder.build())
              .build();

      TopicName topicName = TopicName.of(projectId, topicId);

      Topic topic =
          topicAdminClient.createTopic(
              Topic.newBuilder()
                  .setName(topicName.toString())
                  .setIngestionDataSourceSettings(ingestionDataSourceSettings)
                  .build());

      System.out.println(
          "Created topic with Cloud Storage ingestion settings: " + topic.getAllFields());
    }
  }
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const bucket = 'YOUR_BUCKET_NAME';
// const inputFormat = 'text';
// const textDelimiter = '\n';
// const matchGlob = '**.txt';
// const minimumObjectCreateTime = 'YYYY-MM-DDThh:mm:ssZ;

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createTopicWithCloudStorageIngestion(
  topicNameOrId,
  bucket,
  inputFormat,
  textDelimiter,
  matchGlob,
  minimumObjectCreateTime
) {
  const minimumDate = Date.parse(minimumObjectCreateTime);
  const topicMetadata = {
    name: topicNameOrId,
    ingestionDataSourceSettings: {
      cloudStorage: {
        bucket,
        minimumObjectCreateTime: {
          seconds: minimumDate / 1000,
          nanos: (minimumDate % 1000) * 1000,
        },
        matchGlob,
      },
    },
  };

  // Make a format appropriately.
  switch (inputFormat) {
    case 'text':
      topicMetadata.ingestionDataSourceSettings.cloudStorage.textFormat = {
        delimiter: textDelimiter,
      };
      break;
    case 'avro':
      topicMetadata.ingestionDataSourceSettings.cloudStorage.avroFormat = {};
      break;
    case 'pubsub_avro':
      topicMetadata.ingestionDataSourceSettings.cloudStorage.pubsubAvroFormat =
        {};
      break;
    default:
      console.error('inputFormat must be in ("text", "avro", "pubsub_avro")');
      return;
  }

  // Creates a new topic with Cloud Storage ingestion.
  await pubSubClient.createTopic(topicMetadata);
  console.log(`Topic ${topicNameOrId} created with Cloud Storage ingestion.`);
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const bucket = 'YOUR_BUCKET_NAME';
// const inputFormat = 'text';
// const textDelimiter = '\n';
// const matchGlob = '**.txt';
// const minimumObjectCreateTime = 'YYYY-MM-DDThh:mm:ssZ;

// Imports the Google Cloud client library
import {PubSub, TopicMetadata} from '@google-cloud/pubsub';

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createTopicWithCloudStorageIngestion(
  topicNameOrId: string,
  bucket: string,
  inputFormat: string,
  textDelimiter: string,
  matchGlob: string,
  minimumObjectCreateTime: string
) {
  const minimumDate = Date.parse(minimumObjectCreateTime);
  const topicMetadata: TopicMetadata = {
    name: topicNameOrId,
    ingestionDataSourceSettings: {
      cloudStorage: {
        bucket,
        minimumObjectCreateTime: {
          seconds: minimumDate / 1000,
          nanos: (minimumDate % 1000) * 1000,
        },
        matchGlob,
      },
    },
  };

  // Make a format appropriately.
  switch (inputFormat) {
    case 'text':
      topicMetadata.ingestionDataSourceSettings!.cloudStorage!.textFormat = {
        delimiter: textDelimiter,
      };
      break;
    case 'avro':
      topicMetadata.ingestionDataSourceSettings!.cloudStorage!.avroFormat = {};
      break;
    case 'pubsub_avro':
      topicMetadata.ingestionDataSourceSettings!.cloudStorage!.pubsubAvroFormat =
        {};
      break;
    default:
      console.error('inputFormat must be in ("text", "avro", "pubsub_avro")');
      return;
  }

  // Creates a new topic with Cloud Storage ingestion.
  await pubSubClient.createTopic(topicMetadata);
  console.log(`Topic ${topicNameOrId} created with Cloud Storage ingestion.`);
}

Python

在尝试此示例之前，请按照 Pub/Sub 快速入门：使用客户端库中的 Python 设置说明进行操作。 如需了解详情，请参阅 Pub/Sub Python API 参考文档。

如需向 Pub/Sub 进行身份验证，请设置应用默认凭据。 如需了解详情，请参阅为本地开发环境设置身份验证。

from google.cloud import pubsub_v1
from google.protobuf import timestamp_pb2
from google.pubsub_v1.types import Topic
from google.pubsub_v1.types import IngestionDataSourceSettings

# TODO(developer)
# project_id = "your-project-id"
# topic_id = "your-topic-id"
# bucket = "your-bucket"
# input_format = "text"  (can be one of "text", "avro", "pubsub_avro")
# text_delimiter = "\n"
# match_glob = "**.txt"
# minimum_object_create_time = "YYYY-MM-DDThh:mm:ssZ"

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_id)

cloud_storage_settings = IngestionDataSourceSettings.CloudStorage(
    bucket=bucket,
)
if input_format == "text":
    cloud_storage_settings.text_format = (
        IngestionDataSourceSettings.CloudStorage.TextFormat(
            delimiter=text_delimiter
        )
    )
elif input_format == "avro":
    cloud_storage_settings.avro_format = (
        IngestionDataSourceSettings.CloudStorage.AvroFormat()
    )
elif input_format == "pubsub_avro":
    cloud_storage_settings.pubsub_avro_format = (
        IngestionDataSourceSettings.CloudStorage.PubSubAvroFormat()
    )
else:
    print(
        "Invalid input_format: "
        + input_format
        + "; must be in ('text', 'avro', 'pubsub_avro')"
    )
    return

if match_glob:
    cloud_storage_settings.match_glob = match_glob

if minimum_object_create_time:
    try:
        minimum_object_create_time_timestamp = timestamp_pb2.Timestamp()
        minimum_object_create_time_timestamp.FromJsonString(
            minimum_object_create_time
        )
        cloud_storage_settings.minimum_object_create_time = (
            minimum_object_create_time_timestamp
        )
    except ValueError:
        print("Invalid minimum_object_create_time: " + minimum_object_create_time)
        return

request = Topic(
    name=topic_path,
    ingestion_data_source_settings=IngestionDataSourceSettings(
        cloud_storage=cloud_storage_settings,
    ),
)

topic = publisher.create_topic(request=request)

print(f"Created topic: {topic.name} with Cloud Storage Ingestion Settings")

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。