Tutorial sul riconoscimento ottico dei caratteri (OCR) (2ª generazione)


Scopri come eseguire il riconoscimento ottico dei caratteri (OCR) su Google Cloud Platform. Questo tutorial mostra come caricare i file immagine in Cloud Storage, estrarre il testo dalle immagini utilizzando Cloud Vision, tradurre il testo utilizzando l'API Cloud Translation e salvare le traduzioni in Cloud Storage. Pub/Sub viene utilizzato per mettere in coda varie attività e attivare le funzioni Cloud Functions appropriate per eseguirle.

Per ulteriori informazioni sull'invio di una richiesta di rilevamento del testo (OCR), vedi Rilevamento del testo nelle immagini, Rilevamento della scrittura a mano libera nelle immagini o Rileva testo nei file (PDF/TIFF).

Obiettivi

  • Scrivere ed eseguire il deployment di diverse funzioni basate su eventi.
  • Carica le immagini su Cloud Storage.
  • Estrai, traduci e salva il testo contenuto nelle immagini caricate.

Costi

In questo documento vengono utilizzati i seguenti componenti fatturabili di Google Cloud:

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

Per generare una stima dei costi in base all'utilizzo previsto, utilizza il Calcolatore prezzi. I nuovi utenti di Google Cloud possono essere idonei a una prova senza costi aggiuntivi.

Prima di iniziare

  1. Accedi al tuo account Google Cloud. Se non conosci Google Cloud, crea un account per valutare le prestazioni dei nostri prodotti in scenari reali. I nuovi clienti ricevono anche 300 $di crediti gratuiti per l'esecuzione, il test e il deployment dei carichi di lavoro.
  2. Nella pagina del selettore di progetti della console Google Cloud, seleziona o crea un progetto Google Cloud.

    Vai al selettore progetti

  3. Assicurati che la fatturazione sia attivata per il tuo progetto Google Cloud.

  4. Abilita le API Cloud Functions, Cloud Build, Cloud Run, Artifact Registry, Eventarc, Logging, Pub/Sub, Cloud Storage, Cloud Translation, and Cloud Vision.

    Abilita le API

  5. Installa Google Cloud CLI.
  6. Per initialize gcloud CLI, esegui questo comando:

    gcloud init
  7. Nella pagina del selettore di progetti della console Google Cloud, seleziona o crea un progetto Google Cloud.

    Vai al selettore progetti

  8. Assicurati che la fatturazione sia attivata per il tuo progetto Google Cloud.

  9. Abilita le API Cloud Functions, Cloud Build, Cloud Run, Artifact Registry, Eventarc, Logging, Pub/Sub, Cloud Storage, Cloud Translation, and Cloud Vision.

    Abilita le API

  10. Installa Google Cloud CLI.
  11. Per initialize gcloud CLI, esegui questo comando:

    gcloud init
  12. Se hai già installato gcloud CLI, aggiornalo eseguendo questo comando:

    gcloud components update
  13. Preparare l'ambiente di sviluppo.

Visualizza il flusso di dati

Il flusso di dati nell'applicazione del tutorial su OCR prevede diversi passaggi:

  1. In Cloud Storage viene caricata un'immagine che contiene testo in qualsiasi lingua.
  2. Viene attivata una Cloud Function, che utilizza l'API Vision per estrarre il testo e rilevare la lingua di origine.
  3. Il testo viene messo in coda per la traduzione pubblicando un messaggio in un argomento Pub/Sub. Viene messa in coda una traduzione per ogni lingua di destinazione diversa da quella di origine.
  4. Se una lingua di destinazione corrisponde alla lingua di origine, la coda di traduzione viene saltata e il testo viene inviato alla coda dei risultati, che rappresenta un argomento Pub/Sub diverso.
  5. Una Cloud Function usa l'API Translation per tradurre il testo nella coda di traduzione. Il risultato tradotto viene inviato alla coda dei risultati.
  6. Un'altra funzione Cloud Functions salva il testo tradotto dalla coda dei risultati su Cloud Storage.
  7. I risultati vengono trovati in Cloud Storage come file di testo per ogni traduzione.

Potrebbe essere utile visualizzare i passaggi:

prepara l'applicazione

  1. Crea un bucket Cloud Storage in cui caricare le immagini, dove YOUR_IMAGE_BUCKET_NAME è un nome di bucket univoco a livello globale:

    gsutil mb gs://YOUR_IMAGE_BUCKET_NAME
    
  2. Crea un bucket Cloud Storage in cui salvare le traduzioni del testo, dove YOUR_RESULT_BUCKET_NAME è un nome di bucket univoco a livello globale:

    gsutil mb gs://YOUR_RESULT_BUCKET_NAME
    
  3. Crea un argomento Cloud Pub/Sub in cui pubblicare richieste di traduzione, dove YOUR_TRANSLATE_TOPIC_NAME è il nome dell'argomento della richiesta di traduzione:

    gcloud pubsub topics create YOUR_TRANSLATE_TOPIC_NAME
    
  4. Crea un argomento Cloud Pub/Sub in cui pubblicare i risultati della traduzione completati, dove YOUR_RESULT_TOPIC_NAME è il nome dell'argomento dei risultati di traduzione:

    gcloud pubsub topics create YOUR_RESULT_TOPIC_NAME
    
  5. Clona il repository dell'app di esempio sulla tua macchina locale:

    Node.js

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

    In alternativa, puoi scaricare l'esempio come file ZIP ed estrarlo.

    Python

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

    In alternativa, puoi scaricare l'esempio come file ZIP ed estrarlo.

    Go

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

    In alternativa, puoi scaricare l'esempio come file ZIP ed estrarlo.

    Java

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

    In alternativa, puoi scaricare l'esempio come file ZIP ed estrarlo.

  6. Passa alla directory che contiene il codice di esempio di Cloud Functions:

    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/

comprendi il codice

Questa sezione descrive le dipendenze e le funzioni che compongono il campione OCR.

Importa dipendenze

L'applicazione deve importare diverse dipendenze per comunicare con i servizi 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();
  }

}

Elabora le immagini

La seguente funzione legge un file immagine caricato da Cloud Storage e chiama una funzione per rilevare se l'immagine contiene testo:

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 err := protojson.Unmarshal(cloudevent.Data(), &data); 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();
    JsonFormat.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 funzione seguente estrae il testo dall'immagine utilizzando l'API Cloud Vision e lo mette in coda per la traduzione:

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"
	"golang.org/x/text/language"
	visionpb "google.golang.org/genproto/googleapis/cloud/vision/v1"
)

// 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;
    }
  }
}

Traduci testo

La seguente funzione traduce il testo estratto e mette in coda il testo tradotto da salvare di nuovo in 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;
  }
}

Salva le traduzioni

Infine, la funzione seguente riceve il testo tradotto e lo salva nuovamente in 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");
  }
}

esegui il deployment delle funzioni

  1. Per eseguire il deployment della funzione di elaborazione delle immagini con un trigger di Cloud Storage, esegui questo comando nella directory che contiene il codice campione (o, nel caso di Java, il file pom.xml):

    Node.js

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=nodejs20 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione di Node.js supportata per eseguire la funzione.

    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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Python supportata per eseguire la funzione.

    Go

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=go121 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Go supportata per eseguire la funzione.

    Java

    gcloud functions deploy ocr-extract \
    --gen2 \
    --runtime=java17 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Java supportata per eseguire la funzione.

    Sostituisci quanto segue:

    • REGION: il nome della regione Google Cloud in cui vuoi eseguire il deployment della funzione (ad esempio us-west1).
    • YOUR_IMAGE_BUCKET_NAME: il nome del bucket Cloud Storage in cui caricherai le immagini. Quando esegui il deployment di funzioni di 2ª generazione, specifica solo il nome del bucket senza il carattere gs:// iniziale, ad esempio --trigger-event-filters="bucket=my-bucket".
  2. Per eseguire il deployment della funzione di traduzione del testo con un trigger di Cloud Pub/Sub, esegui questo comando nella directory che contiene il codice campione (o, nel caso di Java, il file pom.xml):

    Node.js

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=nodejs20 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione di Node.js supportata per eseguire la funzione.

    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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Python supportata per eseguire la funzione.

    Go

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=go121 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Go supportata per eseguire la funzione.

    Java

    gcloud functions deploy ocr-translate \
    --gen2 \
    --runtime=java17 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Java supportata per eseguire la funzione.

  3. Per eseguire il deployment della funzione che salva i risultati in Cloud Storage con un trigger di Cloud Pub/Sub, esegui questo comando nella directory che contiene il codice campione (o, nel caso di Java, il file pom.xml):

    Node.js

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=nodejs20 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione di Node.js supportata per eseguire la funzione.

    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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Python supportata per eseguire la funzione.

    Go

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=go121 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Go supportata per eseguire la funzione.

    Java

    gcloud functions deploy ocr-save \
    --gen2 \
    --runtime=java17 \
    --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"

    Utilizza il flag --runtime per specificare l'ID runtime di una versione Java supportata per eseguire la funzione.

Carica un'immagine

  1. Carica un'immagine nel tuo bucket Cloud Storage immagine:

    gsutil cp PATH_TO_IMAGE gs://YOUR_IMAGE_BUCKET_NAME
    

    dove

    • PATH_TO_IMAGE è un percorso a un file immagine (che contiene testo) sul tuo sistema locale.
    • YOUR_IMAGE_BUCKET_NAME è il nome del bucket in cui stai caricando le immagini.

    Puoi scaricare una delle immagini dal progetto di esempio.

  2. Controlla i log per assicurarti che le esecuzioni siano state completate:

    gcloud functions logs read --limit 100
    
  3. Puoi visualizzare le traduzioni salvate nel bucket Cloud Storage che hai utilizzato per YOUR_RESULT_BUCKET_NAME.

Esegui la pulizia

Per evitare che al tuo Account Google Cloud vengano addebitati costi relativi alle risorse utilizzate in questo tutorial, elimina il progetto che contiene le risorse oppure mantieni il progetto ed elimina le singole risorse.

Elimina il progetto

Il modo più semplice per eliminare la fatturazione è eliminare il progetto che hai creato per il tutorial.

Per eliminare il progetto:

  1. Nella console Google Cloud, vai alla pagina Gestisci risorse.

    Vai a Gestisci risorse

  2. Nell'elenco dei progetti, seleziona il progetto che vuoi eliminare, quindi fai clic su Elimina.
  3. Nella finestra di dialogo, digita l'ID del progetto e fai clic su Chiudi per eliminare il progetto.

Elimina Cloud Functions

L'eliminazione di Cloud Functions non rimuove le risorse archiviate in Cloud Storage.

Per eliminare le funzioni Cloud Functions create in questo tutorial, esegui questi comandi:

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

Puoi anche eliminare Cloud Functions dalla console Google Cloud.