Instructivo de reconocimiento óptico de caracteres (OCR)


Aprende a realizar el reconocimiento óptico de caracteres (OCR) en Google Cloud Platform. En este instructivo, se muestra cómo subir archivos de imagen a Cloud Storage, extraer el texto de las imágenes con Cloud Vision y traducir el texto con la API de Cloud Translation, y vuelve a guardar las traducciones en Cloud Storage. Pub/Sub se usa para poner en cola varias tareas y activar las funciones correctas de Cloud Run Functions para realizarlas.

Para obtener más información sobre cómo enviar una solicitud de detección de texto (OCR), consulta Detecta texto en imágenes, Detecta escritura a mano en imágenes o Detecta texto en archivos (PDF/TIFF).

Objetivos

  • Escribir e implementar varias funciones controladas por eventos
  • Subir imágenes a Cloud Storage
  • Extraer, traducir y guardar texto contenido en imágenes que subas

Costos

En este documento, usarás los siguientes componentes facturables de Google Cloud:

  • Cloud Run functions
  • Cloud Build
  • Pub/Sub
  • Artifact Registry
  • Eventarc
  • Cloud Run
  • Cloud Logging
  • Cloud Storage
  • Cloud Translation API
  • Cloud Vision

Para generar una estimación de costos en función del uso previsto, usa la calculadora de precios. Es posible que los usuarios nuevos de Google Cloud califiquen para obtener una prueba gratuita.

Antes de comenzar

  1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.
  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Go to project selector

  3. Make sure that billing is enabled for your Google Cloud project.

  4. Enable the Cloud Functions, Cloud Build, Cloud Run, Artifact Registry, Eventarc, Logging, Pub/Sub, Cloud Storage, Cloud Translation, and Cloud Vision APIs.

    Enable the APIs

  5. Install the Google Cloud CLI.
  6. To initialize the gcloud CLI, run the following command:

    gcloud init
  7. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Go to project selector

  8. Make sure that billing is enabled for your Google Cloud project.

  9. Enable the Cloud Functions, Cloud Build, Cloud Run, Artifact Registry, Eventarc, Logging, Pub/Sub, Cloud Storage, Cloud Translation, and Cloud Vision APIs.

    Enable the APIs

  10. Install the Google Cloud CLI.
  11. To initialize the gcloud CLI, run the following command:

    gcloud init
  12. Si ya tienes instalado gcloud CLI, ejecuta el siguiente comando para actualizarla:

    gcloud components update
  13. Prepara tu entorno de desarrollo.

Visualiza el flujo de datos

El flujo de datos en la aplicación del instructivo de OCR incluye los siguientes pasos:

  1. Una imagen que contiene texto en cualquier idioma se sube a Cloud Storage.
  2. Se activa una función de Cloud Run Functions que usa la API de Vision para extraer el texto y detectar el idioma de origen.
  3. El texto se pone en cola para la traducción mediante la publicación de un mensaje en un tema de Pub/Sub. Se pone en cola una traducción para cada idioma objetivo diferente del idioma de origen.
  4. Si un idioma objetivo coincide con el idioma de origen, la cola de traducciones se omite, y el texto se envía a la cola de resultados, que es un tema de Pub/Sub diferente.
  5. Una función de Cloud Run Functions usa la API de Cloud Translation para traducir el texto de la cola de traducciones. El resultado se envía a la cola de resultados.
  6. Otra función de Cloud Run Functions guarda el texto traducido de la cola de resultados en Cloud Storage.
  7. Los resultados se encuentran en Cloud Storage como archivos de texto de cada traducción.

El siguiente gráfico puede ayudarte a visualizar los pasos:

Prepara la aplicación

  1. Crea un bucket de Cloud Storage para subir imágenes, en el que YOUR_IMAGE_BUCKET_NAME es un nombre de bucket único a nivel global:

    gcloud storage buckets create gs://YOUR_IMAGE_BUCKET_NAME
  2. Crea un bucket de Cloud Storage para guardar las traducciones de texto, en el que YOUR_RESULT_BUCKET_NAME es un nombre de bucket único a nivel global:

    gcloud storage buckets create gs://YOUR_RESULT_BUCKET_NAME
  3. Crea un tema de Cloud Pub/Sub para publicar las solicitudes de traducción, en el que YOUR_TRANSLATE_TOPIC_NAME es el nombre del tema de tu solicitud de traducción:

    gcloud pubsub topics create YOUR_TRANSLATE_TOPIC_NAME
  4. Crea un tema de Cloud Pub/Sub para publicar los resultados de traducción finalizados, en el que YOUR_RESULT_TOPIC_NAME es el nombre del tema de los resultados de las traducciones:

    gcloud pubsub topics create YOUR_RESULT_TOPIC_NAME
  5. Clona el repositorio de la app de muestra en tu máquina local:

    Node.js

    git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git

    De manera opcional, puedes descargar la muestra como un archivo zip y extraerla.

    Python

    git clone https://github.com/GoogleCloudPlatform/python-docs-samples.git

    De manera opcional, puedes descargar la muestra como un archivo zip y extraerla.

    Go

    git clone https://github.com/GoogleCloudPlatform/golang-samples.git

    De manera opcional, puedes descargar la muestra como un archivo ZIP y extraerla.

    Java

    git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git

    De manera opcional, puedes descargar la muestra como un archivo zip y extraerla.

  6. Ve al directorio que contiene el código de muestra de funciones de Cloud Run:

    Node.js

    cd nodejs-docs-samples/functions/v2/ocr/app/

    Python

    cd python-docs-samples/functions/v2/ocr/

    Go

    cd golang-samples/functions/functionsv2/ocr/app/

    Java

    cd java-docs-samples/functions/v2/ocr/ocr-process-image/

Examine el código

En esta sección, se describen las dependencias y las funciones que conforman la muestra de OCR.

Importa las dependencias

La aplicación debe importar varias dependencias con el fin de comunicarse con los servicios de Google Cloud Platform:

Node.js

// Get a reference to the Pub/Sub component
const {PubSub} = require('@google-cloud/pubsub');
const pubsub = new PubSub();

// Get a reference to the Cloud Storage component
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();

// Get a reference to the Cloud Vision API component
const Vision = require('@google-cloud/vision');
const vision = new Vision.ImageAnnotatorClient();

// Get a reference to the Translate API component
const {Translate} = require('@google-cloud/translate').v2;
const translate = new Translate();

const functions = require('@google-cloud/functions-framework');

Python

import base64
import json
import os

from cloudevents.http import CloudEvent

import functions_framework

from google.cloud import pubsub_v1
from google.cloud import storage
from google.cloud import translate_v2 as translate
from google.cloud import vision


vision_client = vision.ImageAnnotatorClient()
translate_client = translate.Client()
publisher = pubsub_v1.PublisherClient()
storage_client = storage.Client()

project_id = os.environ.get("GCP_PROJECT")

Go


// Package ocr contains Go samples for creating OCR
// (Optical Character Recognition) Cloud functions.
package ocr

import (
	"context"
	"fmt"
	"os"
	"strings"

	"cloud.google.com/go/pubsub"
	"cloud.google.com/go/storage"
	"cloud.google.com/go/translate"
	vision "cloud.google.com/go/vision/apiv1"
	"golang.org/x/text/language"
)

type ocrMessage struct {
	Text     string       `json:"text"`
	FileName string       `json:"fileName"`
	Lang     language.Tag `json:"lang"`
	SrcLang  language.Tag `json:"srcLang"`
}

// Eventarc sends a MessagePublishedData object.
// See the documentation for additional fields and more details:
// https://cloud.google.com/eventarc/docs/cloudevents#pubsub_1
type MessagePublishedData struct {
	Message PubSubMessage
}

// PubSubMessage is the payload of a Pub/Sub event.
// See the documentation for additional fields and more details:
// https://cloud.google.com/pubsub/docs/reference/rest/v1/PubsubMessage
type PubSubMessage struct {
	Data []byte `json:"data"`
}

var (
	visionClient    *vision.ImageAnnotatorClient
	translateClient *translate.Client
	pubsubClient    *pubsub.Client
	storageClient   *storage.Client

	projectID      string
	resultBucket   string
	resultTopic    string
	toLang         []string
	translateTopic string
)

func setup(ctx context.Context) error {
	projectID = os.Getenv("GCP_PROJECT")
	resultBucket = os.Getenv("RESULT_BUCKET")
	resultTopic = os.Getenv("RESULT_TOPIC")
	toLang = strings.Split(os.Getenv("TO_LANG"), ",")
	translateTopic = os.Getenv("TRANSLATE_TOPIC")

	var err error // Prevent shadowing clients with :=.

	if visionClient == nil {
		visionClient, err = vision.NewImageAnnotatorClient(ctx)
		if err != nil {
			return fmt.Errorf("vision.NewImageAnnotatorClient: %w", err)
		}
	}

	if translateClient == nil {
		translateClient, err = translate.NewClient(ctx)
		if err != nil {
			return fmt.Errorf("translate.NewClient: %w", err)
		}
	}

	if pubsubClient == nil {
		pubsubClient, err = pubsub.NewClient(ctx, projectID)
		if err != nil {
			return fmt.Errorf("translate.NewClient: %w", err)
		}
	}

	if storageClient == nil {
		storageClient, err = storage.NewClient(ctx)
		if err != nil {
			return fmt.Errorf("storage.NewClient: %w", err)
		}
	}
	return nil
}

Java

public class OcrProcessImage implements CloudEventsFunction {
  // TODO<developer> set these environment variables
  private static final String PROJECT_ID = System.getenv("GCP_PROJECT");
  private static final String TRANSLATE_TOPIC_NAME = System.getenv("TRANSLATE_TOPIC");
  private static final String[] TO_LANGS = System.getenv("TO_LANG") == null ? new String[] { "es" }
      : System.getenv("TO_LANG").split(",");

  private static final Logger logger = Logger.getLogger(OcrProcessImage.class.getName());
  private static final String LOCATION_NAME = LocationName.of(PROJECT_ID, "global").toString();
  private Publisher publisher;

  public OcrProcessImage() throws IOException {
    publisher = Publisher.newBuilder(ProjectTopicName.of(PROJECT_ID, TRANSLATE_TOPIC_NAME)).build();
  }

}

Procesa las imágenes

La siguiente función lee un archivo de imagen que se subió desde Cloud Storage y llama a la función para detectar si la imagen contiene texto, como se muestra a continuación:

Node.js

/**
 * This function is exported by index.js, and is executed when
 * a file is uploaded to the Cloud Storage bucket you created
 * for uploading images.
 *
 * @param {object} cloudEvent A CloudEvent containing the Cloud Storage File object.
 * https://cloud.google.com/storage/docs/json_api/v1/objects
 */
functions.cloudEvent('processImage', async cloudEvent => {
  const {bucket, name} = cloudEvent.data;

  if (!bucket) {
    throw new Error(
      'Bucket not provided. Make sure you have a "bucket" property in your request'
    );
  }
  if (!name) {
    throw new Error(
      'Filename not provided. Make sure you have a "name" property in your request'
    );
  }

  await detectText(bucket, name);
  console.log(`File ${name} processed.`);
});

Python

@functions_framework.cloud_event
def process_image(cloud_event: CloudEvent) -> None:
    """Cloud Function triggered by Cloud Storage when a file is changed.

    Gets the names of the newly created object and its bucket then calls
    detect_text to find text in that image.

    detect_text finishes by sending PubSub messages requesting another service
    then complete processing those texts by translating them and saving the
    translations.
    """

    # Check that the received event is of the expected type, return error if not
    expected_type = "google.cloud.storage.object.v1.finalized"
    received_type = cloud_event["type"]
    if received_type != expected_type:
        raise ValueError(f"Expected {expected_type} but received {received_type}")

    # Extract the bucket and file names of the uploaded image for processing
    data = cloud_event.data
    bucket = data["bucket"]
    filename = data["name"]

    # Process the information in the new image
    detect_text(bucket, filename)

    print(f"File {filename} processed.")

Go


package ocr

import (
	"context"
	"fmt"
	"log"

	"github.com/GoogleCloudPlatform/functions-framework-go/functions"
	"github.com/cloudevents/sdk-go/v2/event"
	"github.com/googleapis/google-cloudevents-go/cloud/storagedata"
	"google.golang.org/protobuf/encoding/protojson"
)

func init() {
	functions.CloudEvent("process-image", ProcessImage)
}

// ProcessImage is executed when a file is uploaded to the Cloud Storage bucket you
// created for uploading images. It runs detectText, which processes the image for text.
func ProcessImage(ctx context.Context, cloudevent event.Event) error {
	if err := setup(ctx); err != nil {
		return fmt.Errorf("ProcessImage: %w", err)
	}

	var data storagedata.StorageObjectData

	// If you omit `DiscardUnknown`, then protojson.Unmarshal returns an error
	// when encountering a new or unknown field.
	options := protojson.UnmarshalOptions{
		DiscardUnknown: true,
	}

	err := options.Unmarshal(cloudevent.Data(), &data)
	if err != nil {
		return fmt.Errorf("protojson.Unmarshal: Failed to parse CloudEvent data: %w", err)
	}
	if data.GetBucket() == "" {
		return fmt.Errorf("empty file.Bucket")
	}
	if data.GetName() == "" {
		return fmt.Errorf("empty file.Name")
	}
	if err := detectText(ctx, data.GetBucket(), data.GetName()); err != nil {
		return fmt.Errorf("detectText: %w", err)
	}
	log.Printf("File %s processed.", data.GetName())
	return nil
}

Java


import com.google.cloud.functions.CloudEventsFunction;
import com.google.cloud.pubsub.v1.Publisher;
import com.google.cloud.translate.v3.DetectLanguageRequest;
import com.google.cloud.translate.v3.DetectLanguageResponse;
import com.google.cloud.translate.v3.LocationName;
import com.google.cloud.translate.v3.TranslationServiceClient;
import com.google.cloud.vision.v1.AnnotateImageRequest;
import com.google.cloud.vision.v1.AnnotateImageResponse;
import com.google.cloud.vision.v1.Feature;
import com.google.cloud.vision.v1.Image;
import com.google.cloud.vision.v1.ImageAnnotatorClient;
import com.google.cloud.vision.v1.ImageSource;
import com.google.events.cloud.storage.v1.StorageObjectData;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.util.JsonFormat;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.PubsubMessage;
import io.cloudevents.CloudEvent;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;

  @Override
  public void accept(CloudEvent event) throws InvalidProtocolBufferException {
    // Unmarshal data from CloudEvent
    String cloudEventData = new String(event.getData().toBytes(), StandardCharsets.UTF_8);
    StorageObjectData.Builder builder = StorageObjectData.newBuilder();

    // If you do not ignore unknown fields, then JsonFormat.Parser returns an
    // error when encountering a new or unknown field. Note that you might lose
    // some event data in the unmarshaling process by ignoring unknown fields.
    JsonFormat.Parser parser = JsonFormat.parser().ignoringUnknownFields();
    parser.merge(cloudEventData, builder);
    StorageObjectData gcsEvent = builder.build();

    String bucket = gcsEvent.getBucket();
    if (bucket.isEmpty()) {
      throw new IllegalArgumentException("Missing bucket parameter");
    }
    String filename = gcsEvent.getName();
    if (filename.isEmpty()) {
      throw new IllegalArgumentException("Missing name parameter");
    }

    detectText(bucket, filename);
  }
}

La siguiente función extrae texto de la imagen con la API de Vision y lo pone en cola para su traducción.

Node.js

/**
 * Detects the text in an image using the Google Vision API.
 *
 * @param {string} bucketName Cloud Storage bucket name.
 * @param {string} filename Cloud Storage file name.
 * @returns {Promise}
 */
const detectText = async (bucketName, filename) => {
  console.log(`Looking for text in image ${filename}`);
  const [textDetections] = await vision.textDetection(
    `gs://${bucketName}/${filename}`
  );
  const [annotation] = textDetections.textAnnotations;
  const text = annotation ? annotation.description.trim() : '';
  console.log('Extracted text from image:', text);

  let [translateDetection] = await translate.detect(text);
  if (Array.isArray(translateDetection)) {
    [translateDetection] = translateDetection;
  }
  console.log(
    `Detected language "${translateDetection.language}" for ${filename}`
  );

  // Submit a message to the bus for each language we're going to translate to
  const TO_LANGS = process.env.TO_LANG.split(',');
  const topicName = process.env.TRANSLATE_TOPIC;

  const tasks = TO_LANGS.map(lang => {
    const messageData = {
      text: text,
      filename: filename,
      lang: lang,
    };

    // Helper function that publishes translation result to a Pub/Sub topic
    // For more information on publishing Pub/Sub messages, see this page:
    //   https://cloud.google.com/pubsub/docs/publisher
    return publishResult(topicName, messageData);
  });

  return Promise.all(tasks);
};

Python

def detect_text(bucket: str, filename: str) -> None:
    """Extract the text from an image uploaded to Cloud Storage, then
    publish messages requesting subscribing services translate the text
    to each target language and save the result.

    Args:
        bucket: name of GCS bucket in which the file is stored.
        filename: name of the file to be read.
    """

    print(f"Looking for text in image {filename}")

    # Use the Vision API to extract text from the image
    image = vision.Image(
        source=vision.ImageSource(gcs_image_uri=f"gs://{bucket}/{filename}")
    )
    text_detection_response = vision_client.text_detection(image=image)
    annotations = text_detection_response.text_annotations

    if annotations:
        text = annotations[0].description
    else:
        text = ""
    print(f"Extracted text {text} from image ({len(text)} chars).")

    detect_language_response = translate_client.detect_language(text)
    src_lang = detect_language_response["language"]
    print(f"Detected language {src_lang} for text {text}.")

    # Submit a message to the bus for each target language
    futures = []  # Asynchronous publish request statuses

    to_langs = os.environ.get("TO_LANG", "").split(",")
    for target_lang in to_langs:
        topic_name = os.environ.get("TRANSLATE_TOPIC")
        if src_lang == target_lang or src_lang == "und":
            topic_name = os.environ.get("RESULT_TOPIC")

        message = {
            "text": text,
            "filename": filename,
            "lang": target_lang,
            "src_lang": src_lang,
        }

        message_data = json.dumps(message).encode("utf-8")
        topic_path = publisher.topic_path(project_id, topic_name)
        future = publisher.publish(topic_path, data=message_data)
        futures.append(future)

    # Wait for each publish request to be completed before exiting
    for future in futures:
        future.result()

Go


package ocr

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"cloud.google.com/go/pubsub"
	"cloud.google.com/go/vision/v2/apiv1/visionpb"
	"golang.org/x/text/language"
)

// detectText detects the text in an image using the Google Vision API.
func detectText(ctx context.Context, bucketName, fileName string) error {
	log.Printf("Looking for text in image %v", fileName)
	maxResults := 1
	image := &visionpb.Image{
		Source: &visionpb.ImageSource{
			GcsImageUri: fmt.Sprintf("gs://%s/%s", bucketName, fileName),
		},
	}
	annotations, err := visionClient.DetectTexts(ctx, image, &visionpb.ImageContext{}, maxResults)
	if err != nil {
		return fmt.Errorf("DetectTexts: %w", err)
	}
	text := ""
	if len(annotations) > 0 {
		text = annotations[0].Description
	}
	if len(annotations) == 0 || len(text) == 0 {
		log.Printf("No text detected in image %q. Returning early.", fileName)
		return nil
	}
	log.Printf("Extracted text %q from image (%d chars).", text, len(text))

	detectResponse, err := translateClient.DetectLanguage(ctx, []string{text})
	if err != nil {
		return fmt.Errorf("DetectLanguage: %w", err)
	}
	if len(detectResponse) == 0 || len(detectResponse[0]) == 0 {
		return fmt.Errorf("DetectLanguage gave empty response")
	}
	srcLang := detectResponse[0][0].Language.String()
	log.Printf("Detected language %q for text %q.", srcLang, text)

	// Submit a message to the bus for each target language
	for _, targetLang := range toLang {
		topicName := translateTopic
		if srcLang == targetLang || srcLang == "und" { // detection returns "und" for undefined language
			topicName = resultTopic
		}
		targetTag, err := language.Parse(targetLang)
		if err != nil {
			return fmt.Errorf("language.Parse: %w", err)
		}
		srcTag, err := language.Parse(srcLang)
		if err != nil {
			return fmt.Errorf("language.Parse: %w", err)
		}
		message, err := json.Marshal(ocrMessage{
			Text:     text,
			FileName: fileName,
			Lang:     targetTag,
			SrcLang:  srcTag,
		})
		if err != nil {
			return fmt.Errorf("json.Marshal: %w", err)
		}
		topic := pubsubClient.Topic(topicName)
		ok, err := topic.Exists(ctx)
		if err != nil {
			return fmt.Errorf("Exists: %w", err)
		}
		if !ok {
			topic, err = pubsubClient.CreateTopic(ctx, topicName)
			if err != nil {
				return fmt.Errorf("CreateTopic: %w", err)
			}
		}
		msg := &pubsub.Message{
			Data: []byte(message),
		}
		log.Printf("Sending pubsub message: %s", message)
		if _, err = topic.Publish(ctx, msg).Get(ctx); err != nil {
			return fmt.Errorf("Get: %w", err)
		}
	}
	return nil
}

Java

private void detectText(String bucket, String filename) {
  logger.info("Looking for text in image " + filename);

  List<AnnotateImageRequest> visionRequests = new ArrayList<>();
  String gcsPath = String.format("gs://%s/%s", bucket, filename);

  ImageSource imgSource = ImageSource.newBuilder().setGcsImageUri(gcsPath).build();
  Image img = Image.newBuilder().setSource(imgSource).build();

  Feature textFeature = Feature.newBuilder().setType(Feature.Type.TEXT_DETECTION).build();
  AnnotateImageRequest visionRequest = AnnotateImageRequest.newBuilder()
      .addFeatures(textFeature).setImage(img)
      .build();
  visionRequests.add(visionRequest);

  // Detect text in an image using the Cloud Vision API
  AnnotateImageResponse visionResponse;
  try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
    visionResponse = client.batchAnnotateImages(visionRequests).getResponses(0);
    if (visionResponse == null || !visionResponse.hasFullTextAnnotation()) {
      logger.info(String.format("Image %s contains no text", filename));
      return;
    }

    if (visionResponse.hasError()) {
      // Log error
      logger.log(
          Level.SEVERE, "Error in vision API call: " + visionResponse.getError().getMessage());
      return;
    }
  } catch (IOException e) {
    // Log error (since IOException cannot be thrown by a Cloud Function)
    logger.log(Level.SEVERE, "Error detecting text: " + e.getMessage(), e);
    return;
  }

  String text = visionResponse.getFullTextAnnotation().getText();
  logger.info("Extracted text from image: " + text);

  // Detect language using the Cloud Translation API
  DetectLanguageRequest languageRequest = DetectLanguageRequest.newBuilder()
      .setParent(LOCATION_NAME)
      .setMimeType("text/plain")
      .setContent(text)
      .build();
  DetectLanguageResponse languageResponse;
  try (TranslationServiceClient client = TranslationServiceClient.create()) {
    languageResponse = client.detectLanguage(languageRequest);
  } catch (IOException e) {
    // Log error (since IOException cannot be thrown by a function)
    logger.log(Level.SEVERE, "Error detecting language: " + e.getMessage(), e);
    return;
  }

  if (languageResponse.getLanguagesCount() == 0) {
    logger.info("No languages were detected for text: " + text);
    return;
  }

  String languageCode = languageResponse.getLanguages(0).getLanguageCode();
  logger.info(String.format("Detected language %s for file %s", languageCode, filename));

  // Send a Pub/Sub translation request for every language we're going to
  // translate to
  for (String targetLanguage : TO_LANGS) {
    logger.info("Sending translation request for language " + targetLanguage);
    OcrTranslateApiMessage message = new OcrTranslateApiMessage(text, filename, targetLanguage);
    ByteString byteStr = ByteString.copyFrom(message.toPubsubData());
    PubsubMessage pubsubApiMessage = PubsubMessage.newBuilder().setData(byteStr).build();
    try {
      publisher.publish(pubsubApiMessage).get();
    } catch (InterruptedException | ExecutionException e) {
      // Log error
      logger.log(Level.SEVERE, "Error publishing translation request: " + e.getMessage(), e);
      return;
    }
  }
}

Traducir texto

La siguiente función traduce el texto extraído y, luego, lo pone en cola para volver a guardarlo en Cloud Storage:

Node.js

/**
 * This function is exported by index.js, and is executed when
 * a message is published to the Cloud Pub/Sub topic specified
 * by the TRANSLATE_TOPIC environment variable. The function
 * translates text using the Google Translate API.
 *
 * @param {object} cloudEvent The CloudEvent containing the Pub/Sub Message object
 * https://cloud.google.com/storage/docs/json_api/v1/objects
 */
functions.cloudEvent('translateText', async cloudEvent => {
  const pubsubData = cloudEvent.data;
  const jsonStr = Buffer.from(pubsubData.message, 'base64').toString();
  const {text, filename, lang} = JSON.parse(jsonStr);

  if (!text) {
    throw new Error(
      'Text not provided. Make sure you have a "text" property in your request'
    );
  }
  if (!filename) {
    throw new Error(
      'Filename not provided. Make sure you have a "filename" property in your request'
    );
  }
  if (!lang) {
    throw new Error(
      'Language not provided. Make sure you have a "lang" property in your request'
    );
  }

  console.log(`Translating text into ${lang}`);
  const [translation] = await translate.translate(text, lang);

  console.log('Translated text:', translation);

  const messageData = {
    text: translation,
    filename: filename,
    lang: lang,
  };

  await publishResult(process.env.RESULT_TOPIC, messageData);
  console.log(`Text translated to ${lang}`);
});

Python

@functions_framework.cloud_event
def translate_text(cloud_event: CloudEvent) -> None:
    """Cloud Function triggered by PubSub when a message is received from
    a subscription.

    Translates the text in the message from the specified source language
    to the requested target language, then sends a message requesting another
    service save the result.
    """

    # Check that the received event is of the expected type, return error if not
    expected_type = "google.cloud.pubsub.topic.v1.messagePublished"
    received_type = cloud_event["type"]
    if received_type != expected_type:
        raise ValueError(f"Expected {expected_type} but received {received_type}")

    # Extract the message body, expected to be a JSON representation of a
    # dictionary, and extract the fields from that dictionary.
    data = cloud_event.data["message"]["data"]
    try:
        message_data = base64.b64decode(data)
        message = json.loads(message_data)

        text = message["text"]
        filename = message["filename"]
        target_lang = message["lang"]
        src_lang = message["src_lang"]
    except Exception as e:
        raise ValueError(f"Missing or malformed PubSub message {data}: {e}.")

    # Translate the text and publish a message with the translation
    print(f"Translating text into {target_lang}.")

    translated_text = translate_client.translate(
        text, target_language=target_lang, source_language=src_lang
    )

    topic_name = os.environ["RESULT_TOPIC"]
    message = {
        "text": translated_text["translatedText"],
        "filename": filename,
        "lang": target_lang,
    }
    message_data = json.dumps(message).encode("utf-8")
    topic_path = publisher.topic_path(project_id, topic_name)
    future = publisher.publish(topic_path, data=message_data)
    future.result()  # Wait for operation to complete

Go


package ocr

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"cloud.google.com/go/pubsub"
	"cloud.google.com/go/translate"
	"github.com/GoogleCloudPlatform/functions-framework-go/functions"
	"github.com/cloudevents/sdk-go/v2/event"
)

func init() {
	functions.CloudEvent("translate-text", TranslateText)
}

// TranslateText is executed when a message is published to the Cloud Pub/Sub
// topic specified by the TRANSLATE_TOPIC environment variable, and translates
// the text using the Google Translate API.
func TranslateText(ctx context.Context, cloudevent event.Event) error {
	var event MessagePublishedData
	if err := setup(ctx); err != nil {
		return fmt.Errorf("setup: %w", err)
	}
	if err := cloudevent.DataAs(&event); err != nil {
		return fmt.Errorf("Failed to parse CloudEvent data: %w", err)
	}
	if event.Message.Data == nil {
		log.Printf("event: %s", event)
		return fmt.Errorf("empty data")
	}
	var message ocrMessage
	if err := json.Unmarshal(event.Message.Data, &message); err != nil {
		return fmt.Errorf("json.Unmarshal: %w", err)
	}

	log.Printf("Translating text into %s.", message.Lang.String())
	opts := translate.Options{
		Source: message.SrcLang,
	}
	translateResponse, err := translateClient.Translate(ctx, []string{message.Text}, message.Lang, &opts)
	if err != nil {
		return fmt.Errorf("Translate: %w", err)
	}
	if len(translateResponse) == 0 {
		return fmt.Errorf("Empty Translate response")
	}
	translatedText := translateResponse[0]

	messageData, err := json.Marshal(ocrMessage{
		Text:     translatedText.Text,
		FileName: message.FileName,
		Lang:     message.Lang,
		SrcLang:  message.SrcLang,
	})
	if err != nil {
		return fmt.Errorf("json.Marshal: %w", err)
	}

	topic := pubsubClient.Topic(resultTopic)
	ok, err := topic.Exists(ctx)
	if err != nil {
		return fmt.Errorf("Exists: %w", err)
	}
	if !ok {
		topic, err = pubsubClient.CreateTopic(ctx, resultTopic)
		if err != nil {
			return fmt.Errorf("CreateTopic: %w", err)
		}
	}
	msg := &pubsub.Message{
		Data: messageData,
	}
	if _, err = topic.Publish(ctx, msg).Get(ctx); err != nil {
		return fmt.Errorf("Get: %w", err)
	}
	log.Printf("Sent translation: %q", translatedText.Text)
	return nil
}

Java


import com.google.cloud.functions.CloudEventsFunction;
import com.google.cloud.pubsub.v1.Publisher;
import com.google.cloud.translate.v3.LocationName;
import com.google.cloud.translate.v3.TranslateTextRequest;
import com.google.cloud.translate.v3.TranslateTextResponse;
import com.google.cloud.translate.v3.TranslationServiceClient;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.protobuf.ByteString;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.PubsubMessage;
import functions.eventpojos.MessagePublishedData;
import io.cloudevents.CloudEvent;
import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.time.OffsetDateTime;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;

public class OcrTranslateText implements CloudEventsFunction {
  private static final Logger logger = Logger.getLogger(OcrTranslateText.class.getName());

  // TODO<developer> set these environment variables
  private static final String PROJECT_ID = getenv("GCP_PROJECT");
  private static final String RESULTS_TOPIC_NAME = getenv("RESULT_TOPIC");
  private static final String LOCATION_NAME = LocationName.of(PROJECT_ID, "global").toString();

  private Publisher publisher;

  public OcrTranslateText() throws IOException {
    publisher = Publisher.newBuilder(ProjectTopicName.of(PROJECT_ID, RESULTS_TOPIC_NAME)).build();
  }

  // Create custom deserializer to handle timestamps in event data
  class DateDeserializer implements JsonDeserializer<OffsetDateTime> {
    @Override
    public OffsetDateTime deserialize(
        JsonElement json, Type typeOfT, JsonDeserializationContext context)
        throws JsonParseException {
      return OffsetDateTime.parse(json.getAsString());
    }
  }

  Gson gson =
      new GsonBuilder().registerTypeAdapter(OffsetDateTime.class, new DateDeserializer()).create();

  @Override
  public void accept(CloudEvent event) throws InterruptedException, IOException {
    MessagePublishedData data =
        gson.fromJson(
            new String(event.getData().toBytes(), StandardCharsets.UTF_8),
            MessagePublishedData.class);
    OcrTranslateApiMessage ocrMessage =
        OcrTranslateApiMessage.fromPubsubData(
            data.getMessage().getData().getBytes(StandardCharsets.UTF_8));

    String targetLang = ocrMessage.getLang();
    logger.info("Translating text into " + targetLang);

    // Translate text to target language
    String text = ocrMessage.getText();
    TranslateTextRequest request =
        TranslateTextRequest.newBuilder()
            .setParent(LOCATION_NAME)
            .setMimeType("text/plain")
            .setTargetLanguageCode(targetLang)
            .addContents(text)
            .build();

    TranslateTextResponse response;
    try (TranslationServiceClient client = TranslationServiceClient.create()) {
      response = client.translateText(request);
    } catch (IOException e) {
      // Log error (since IOException cannot be thrown by a function)
      logger.log(Level.SEVERE, "Error translating text: " + e.getMessage(), e);
      return;
    }
    if (response.getTranslationsCount() == 0) {
      return;
    }

    String translatedText = response.getTranslations(0).getTranslatedText();
    logger.info("Translated text: " + translatedText);

    // Send translated text to (subsequent) Pub/Sub topic
    String filename = ocrMessage.getFilename();
    OcrTranslateApiMessage translateMessage =
        new OcrTranslateApiMessage(translatedText, filename, targetLang);
    try {
      ByteString byteStr = ByteString.copyFrom(translateMessage.toPubsubData());
      PubsubMessage pubsubApiMessage = PubsubMessage.newBuilder().setData(byteStr).build();
      publisher.publish(pubsubApiMessage).get();
      logger.info("Text translated to " + targetLang);
    } catch (InterruptedException | ExecutionException e) {
      // Log error (since these exception types cannot be thrown by a function)
      logger.log(Level.SEVERE, "Error publishing translation save request: " + e.getMessage(), e);
    }
  }

  // Avoid ungraceful deployment failures due to unset environment variables.
  // If you get this warning you should redeploy with the variable set.
  private static String getenv(String name) {
    String value = System.getenv(name);
    if (value == null) {
      logger.warning("Environment variable " + name + " was not set");
      value = "MISSING";
    }
    return value;
  }
}

Guarda las traducciones

Finalmente, la siguiente función recibe el texto traducido y lo vuelve a guardar en Cloud Storage:

Node.js

/**
 * This function is exported by index.js, and is executed when
 * a message is published to the Cloud Pub/Sub topic specified
 * by the RESULT_TOPIC environment variable. The function saves
 * the data packet to a file in GCS.
 *
 * @param {object} cloudEvent The CloudEvent containing the Pub/Sub Message object.
 * https://cloud.google.com/storage/docs/json_api/v1/objects
 */
functions.cloudEvent('saveResult', async cloudEvent => {
  const pubsubData = cloudEvent.data;
  const jsonStr = Buffer.from(pubsubData.message, 'base64').toString();
  const {text, filename, lang} = JSON.parse(jsonStr);

  if (!text) {
    throw new Error(
      'Text not provided. Make sure you have a "text" property in your request'
    );
  }
  if (!filename) {
    throw new Error(
      'Filename not provided. Make sure you have a "filename" property in your request'
    );
  }
  if (!lang) {
    throw new Error(
      'Language not provided. Make sure you have a "lang" property in your request'
    );
  }

  console.log(`Received request to save file ${filename}`);

  const bucketName = process.env.RESULT_BUCKET;
  const newFilename = renameImageForSave(filename, lang);
  const file = storage.bucket(bucketName).file(newFilename);

  console.log(`Saving result to ${newFilename} in bucket ${bucketName}`);

  await file.save(text);
  console.log('File saved.');
});

Python

@functions_framework.cloud_event
def save_result(cloud_event: CloudEvent) -> None:
    """Cloud Function triggered by PubSub when a message is received from
    a subscription.

    Saves translated text to a Cloud Storage object as requested.
    """
    # Check that the received event is of the expected type, return error if not
    expected_type = "google.cloud.pubsub.topic.v1.messagePublished"
    received_type = cloud_event["type"]
    if received_type != expected_type:
        raise ValueError(f"Expected {expected_type} but received {received_type}")

    # Extract the message body, expected to be a JSON representation of a
    # dictionary, and extract the fields from that dictionary.
    data = cloud_event.data["message"]["data"]
    try:
        message_data = base64.b64decode(data)
        message = json.loads(message_data)

        text = message["text"]
        filename = message["filename"]
        lang = message["lang"]
    except Exception as e:
        raise ValueError(f"Missing or malformed PubSub message {data}: {e}.")

    print(f"Received request to save file {filename}.")

    # Save the translation in RESULT_BUCKET
    bucket_name = os.environ["RESULT_BUCKET"]
    result_filename = f"{filename}_{lang}.txt"
    bucket = storage_client.get_bucket(bucket_name)
    blob = bucket.blob(result_filename)

    print(f"Saving result to {result_filename} in bucket {bucket_name}.")

    blob.upload_from_string(text)

    print("File saved.")

Go


package ocr

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/GoogleCloudPlatform/functions-framework-go/functions"
	"github.com/cloudevents/sdk-go/v2/event"
)

func init() {
	functions.CloudEvent("save-result", SaveResult)
}

// SaveResult is executed when a message is published to the Cloud Pub/Sub topic
// specified by the RESULT_TOPIC environment vairable, and saves the data packet
// to a file in GCS.
func SaveResult(ctx context.Context, cloudevent event.Event) error {
	var event MessagePublishedData
	if err := setup(ctx); err != nil {
		return fmt.Errorf("ProcessImage: %w", err)
	}
	if err := cloudevent.DataAs(&event); err != nil {
		return fmt.Errorf("Failed to parse CloudEvent data: %w", err)
	}
	var message ocrMessage
	if event.Message.Data == nil {
		return fmt.Errorf("Empty data")
	}
	if err := json.Unmarshal(event.Message.Data, &message); err != nil {
		return fmt.Errorf("json.Unmarshal: %w", err)
	}
	log.Printf("Received request to save file %q.", message.FileName)

	resultFilename := fmt.Sprintf("%s_%s.txt", message.FileName, message.Lang)
	bucket := storageClient.Bucket(resultBucket)

	log.Printf("Saving result to %q in bucket %q.", resultFilename, resultBucket)

	w := bucket.Object(resultFilename).NewWriter(ctx)
	defer w.Close()
	fmt.Fprint(w, message.Text)

	log.Printf("File saved.")
	return nil
}

Java


import com.google.cloud.functions.CloudEventsFunction;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.BlobInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import functions.eventpojos.MessagePublishedData;
import io.cloudevents.CloudEvent;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.time.OffsetDateTime;
import java.util.logging.Logger;

public class OcrSaveResult implements CloudEventsFunction {
  // TODO<developer> set this environment variable
  private static final String RESULT_BUCKET = System.getenv("RESULT_BUCKET");

  private static final Storage STORAGE = StorageOptions.getDefaultInstance().getService();
  private static final Logger logger = Logger.getLogger(OcrSaveResult.class.getName());

  // Configure Gson with custom deserializer to handle timestamps in event data
  class DateDeserializer implements JsonDeserializer<OffsetDateTime> {
    @Override
    public OffsetDateTime deserialize(
        JsonElement json, Type typeOfT, JsonDeserializationContext context)
        throws JsonParseException {
      return OffsetDateTime.parse(json.getAsString());
    }
  }

  Gson gson =
      new GsonBuilder().registerTypeAdapter(OffsetDateTime.class, new DateDeserializer()).create();

  @Override
  public void accept(CloudEvent event) {
    // Unmarshal data from CloudEvent
    MessagePublishedData data =
        gson.fromJson(
            new String(event.getData().toBytes(), StandardCharsets.UTF_8),
            MessagePublishedData.class);
    OcrTranslateApiMessage ocrMessage =
        OcrTranslateApiMessage.fromPubsubData(
            data.getMessage().getData().getBytes(StandardCharsets.UTF_8));

    logger.info("Received request to save file " + ocrMessage.getFilename());

    String newFileName =
        String.format("%s_to_%s.txt", ocrMessage.getFilename(), ocrMessage.getLang());

    // Save file to RESULT_BUCKET with name newFileName
    logger.info(String.format("Saving result to %s in bucket %s", newFileName, RESULT_BUCKET));
    BlobInfo blobInfo = BlobInfo.newBuilder(BlobId.of(RESULT_BUCKET, newFileName)).build();
    STORAGE.create(blobInfo, ocrMessage.getText().getBytes(StandardCharsets.UTF_8));
    logger.info("File saved");
  }
}

Implementa las funciones

  1. Para implementar la función de procesamiento de imágenes con un activador de Cloud Storage, ejecuta el siguiente comando en el directorio que contiene el código de muestra (o, en el caso de Java, el archivo pom.xml):

    Node.js

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=nodejs22 \
    --region=REGION \
    --source=. \
    --entry-point=processImage \
    --trigger-bucket YOUR_IMAGE_BUCKET_NAME \
    --set-env-vars "^:^GCP_PROJECT=YOUR_GCP_PROJECT_ID:TRANSLATE_TOPIC=YOUR_TRANSLATE_TOPIC_NAME:RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME:TO_LANG=es,en,fr,ja"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión compatible de Node.js para ejecutar la función.

    Python

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=python312 \
    --region=REGION \
    --source=. \
    --entry-point=process_image \
    --trigger-bucket YOUR_IMAGE_BUCKET_NAME \
    --set-env-vars "^:^GCP_PROJECT=YOUR_GCP_PROJECT_ID:TRANSLATE_TOPIC=YOUR_TRANSLATE_TOPIC_NAME:RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME:TO_LANG=es,en,fr,ja"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Python compatible con el fin de ejecutar la función.

    Go

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=go122 \
    --region=REGION \
    --source=. \
    --entry-point=process-image \
    --trigger-bucket YOUR_IMAGE_BUCKET_NAME \
    --set-env-vars "^:^GCP_PROJECT=YOUR_GCP_PROJECT_ID:TRANSLATE_TOPIC=YOUR_TRANSLATE_TOPIC_NAME:RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME:TO_LANG=es,en,fr,ja"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Go compatible para ejecutar tu función.

    Java

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=java21 \
    --region=REGION \
    --source=. \
    --entry-point=functions.OcrProcessImage \
    --memory=512MB \
    --trigger-bucket YOUR_IMAGE_BUCKET_NAME \
    --set-env-vars "^:^GCP_PROJECT=YOUR_GCP_PROJECT_ID:TRANSLATE_TOPIC=YOUR_TRANSLATE_TOPIC_NAME:RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME:TO_LANG=es,en,fr,ja"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión de Java compatible con el fin de ejecutar tu función.

    Reemplaza lo siguiente:

    • REGION: el nombre de la región de Google Cloud en la que deseas implementar tu función (por ejemplo, us-west1).
    • YOUR_IMAGE_BUCKET_NAME: el nombre del bucket de Cloud Storage al que subirás las imágenes. Cuando implementes Cloud Run Functions, especifica el nombre del bucket solo sin el gs:// inicial; por ejemplo: --trigger-event-filters="bucket=my-bucket".
  2. Para implementar la función de traducción de texto con un activador de Pub/Sub, ejecuta el siguiente comando en el directorio que contiene el código de muestra (o en el caso de Java, el archivo pom.xml):

    Node.js

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=nodejs22 \
    --region=REGION \
    --source=. \
    --entry-point=translateText \
    --trigger-topic YOUR_TRANSLATE_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión compatible de Node.js para ejecutar la función.

    Python

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=python312 \
    --region=REGION \
    --source=. \
    --entry-point=translate_text \
    --trigger-topic YOUR_TRANSLATE_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Python compatible con el fin de ejecutar la función.

    Go

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=go122 \
    --region=REGION \
    --source=. \
    --entry-point=translate-text \
    --trigger-topic YOUR_TRANSLATE_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Go compatible para ejecutar tu función.

    Java

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=java21 \
    --region=REGION \
    --source=. \
    --entry-point=functions.OcrTranslateText \
    --memory=512MB \
    --trigger-topic YOUR_TRANSLATE_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_TOPIC=YOUR_RESULT_TOPIC_NAME"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión de Java compatible con el fin de ejecutar tu función.

  3. Para implementar la función que guarda los resultados en Cloud Storage con un activador de Pub/Sub, ejecuta el siguiente comando en el directorio que contiene el código de muestra (o, en el caso de Java, el archivo pom.xml):

    Node.js

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=nodejs22 \
    --region=REGION \
    --source=. \
    --entry-point=saveResult \
    --trigger-topic YOUR_RESULT_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_BUCKET=YOUR_RESULT_BUCKET_NAME"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión compatible de Node.js para ejecutar la función.

    Python

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=python312 \
    --region=REGION \
    --source=. \
    --entry-point=save_result \
    --trigger-topic YOUR_RESULT_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_BUCKET=YOUR_RESULT_BUCKET_NAME"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Python compatible con el fin de ejecutar la función.

    Go

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=go122 \
    --region=REGION \
    --source=. \
    --entry-point=save-result \
    --trigger-topic YOUR_RESULT_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_BUCKET=YOUR_RESULT_BUCKET_NAME"

    Usa la marca --runtime para especificar el ID de entorno de ejecución de una versión de Go compatible para ejecutar tu función.

    Java

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=java21 \
    --region=REGION \
    --source=. \
    --entry-point=functions.OcrSaveResult \
    --memory=512MB \
    --trigger-topic YOUR_RESULT_TOPIC_NAME \
    --set-env-vars "GCP_PROJECT=YOUR_GCP_PROJECT_ID,RESULT_BUCKET=YOUR_RESULT_BUCKET_NAME"

    Usa la marca --runtime para especificar el ID del entorno de ejecución de una versión de Java compatible con el fin de ejecutar tu función.

Suba una imagen

  1. Sube una imagen a tu bucket de imágenes de Cloud Storage:

    gcloud storage cp PATH_TO_IMAGE gs://YOUR_IMAGE_BUCKET_NAME

    en el que

    • PATH_TO_IMAGE es una ruta a un archivo de imagen (que contiene texto) en el sistema local.
    • YOUR_IMAGE_BUCKET_NAME es el nombre del bucket al que subes las imágenes.

    Puedes descargar una de las imágenes desde el proyecto de muestra.

  2. Revisa los registros para asegurarte de que las ejecuciones se completaron:

    gcloud functions logs read --limit 100
  3. Puedes ver las traducciones guardadas en el bucket de Cloud Storage que usaste para YOUR_RESULT_BUCKET_NAME.

Limpia

Para evitar que se apliquen cargos a tu cuenta de Google Cloud por los recursos usados en este instructivo, borra el proyecto que contiene los recursos o conserva el proyecto y borra los recursos individuales.

Borra el proyecto

La manera más fácil de eliminar la facturación es borrar el proyecto que creaste para el instructivo.

Para borrar el proyecto, sigue estos pasos:

  1. In the Google Cloud console, go to the Manage resources page.

    Go to Manage resources

  2. In the project list, select the project that you want to delete, and then click Delete.
  3. In the dialog, type the project ID, and then click Shut down to delete the project.

Borra la función

Borrar las funciones de Cloud Run no quita ningún recurso almacenado en Cloud Storage.

Para borrar las funciones de Cloud Run Functions que creaste en este instructivo, ejecuta los siguientes comandos:

gcloud functions delete ocr-extract
gcloud functions delete ocr-translate
gcloud functions delete ocr-save

También puedes borrar Cloud Run Functions en la consola de Google Cloud.