Cloud Functions a été renommé Cloud Run Functions. Pour en savoir plus, consultez l'article de blog sur Cloud Run Functions.

Déclencheur Firebase Realtime Database (RTDB)

// LINT.IfChange(nodejs_version) // LINT.ThenChange(:nodejs_version_console_text) // LINT.IfChange(nodejs_version_console_text) // LINT.ThenChange(:nodejs_version)

Déclenche une fonction lorsqu'une base de données en temps réel Firebase est mise à jour.

En savoir plus

Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :

Déclencheurs Firebase Realtime Database

Exemple de code

C#

Pour vous authentifier auprès de Cloud Functions, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez la page Configurer l'authentification pour un environnement de développement local.

using CloudNative.CloudEvents;
using Google.Cloud.Functions.Framework;
using Google.Events.Protobuf.Firebase.Database.V1;
using Microsoft.Extensions.Logging;
using System.Threading;
using System.Threading.Tasks;

namespace FirebaseRtdb;

public class Function : ICloudEventFunction<ReferenceEventData>
{
    private readonly ILogger _logger;

    public Function(ILogger<Function> logger) =>
        _logger = logger;

    public Task HandleAsync(CloudEvent cloudEvent, ReferenceEventData data, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Function triggered by change to {subject}", cloudEvent.Subject);
        _logger.LogInformation("Delta: {delta}", data.Delta);

        // In this example, we don't need to perform any asynchronous operations, so the
        // method doesn't need to be declared async.
        return Task.CompletedTask;
    }
}

Go


// Package p contains a Cloud Function triggered by a Firebase Realtime Database
// event.
package p

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/functions/metadata"
)

// RTDBEvent is the payload of a RTDB event.
type RTDBEvent struct {
	Data  interface{} `json:"data"`
	Delta interface{} `json:"delta"`
}

// HelloRTDB handles changes to a Firebase RTDB.
func HelloRTDB(ctx context.Context, e RTDBEvent) error {
	meta, err := metadata.FromContext(ctx)
	if err != nil {
		return fmt.Errorf("metadata.FromContext: %w", err)
	}
	log.Printf("Function triggered by change to: %v", meta.Resource)
	log.Printf("%+v", e)
	return nil
}

Java

import com.google.cloud.functions.Context;
import com.google.cloud.functions.RawBackgroundFunction;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import java.util.logging.Logger;

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

  // Use GSON (https://github.com/google/gson) to parse JSON content.
  private static final Gson gson = new Gson();

  @Override
  public void accept(String json, Context context) {
    logger.info("Function triggered by change to: " + context.resource());

    JsonObject body = gson.fromJson(json, JsonObject.class);

    boolean isAdmin = false;
    if (body != null && body.has("auth")) {
      JsonObject authObj = body.getAsJsonObject("auth");
      isAdmin = authObj.has("admin") && authObj.get("admin").getAsBoolean();
    }

    logger.info("Admin?: " + isAdmin);

    if (body != null && body.has("delta")) {
      logger.info("Delta:");
      logger.info(body.get("delta").toString());
    }
  }
}

Node.js

/**
 * Background Function triggered by a change to a Firebase RTDB reference.
 *
 * @param {!Object} event The Cloud Functions event.
 * @param {!Object} context The Cloud Functions event context.
 */
exports.helloRTDB = (event, context) => {
  const triggerResource = context.resource;

  console.log(`Function triggered by change to: ${triggerResource}`);
  console.log(`Admin?: ${!!context.auth.admin}`);
  console.log('Delta:');
  console.log(JSON.stringify(event.delta, null, 2));
};

PHP


use Google\CloudFunctions\CloudEvent;

function firebaseRTDB(CloudEvent $cloudevent)
{
    $log = fopen(getenv('LOGGER_OUTPUT') ?: 'php://stderr', 'wb');

    fwrite($log, 'Event: ' . $cloudevent->getId() . PHP_EOL);

    $data = $cloudevent->getData();
    $resource = $data['resource'] ?? '<null>';

    fwrite($log, 'Function triggered by change to: ' . $resource . PHP_EOL);

    $isAdmin = isset($data['auth']['admin']) && $data['auth']['admin'] == true;

    fwrite($log, 'Admin?: ' . var_export($isAdmin, true) . PHP_EOL);
    fwrite($log, 'Delta: ' . json_encode($data['delta'] ?? '') . PHP_EOL);
}

Python

import json

def hello_rtdb(data, context):
    """Triggered by a change to a Firebase RTDB reference.
    Args:
        data (dict): The event payload.
        context (google.cloud.functions.Context): Metadata for the event.
    """
    trigger_resource = context.resource

    print("Function triggered by change to: %s" % trigger_resource)
    print("Admin?: %s" % data.get("admin", False))
    print("Delta:")
    print(json.dumps(data["delta"]))

Ruby

require "functions_framework"

# Triggered by a change to a Firebase RTDB document.
FunctionsFramework.cloud_event "hello_rtdb" do |event|
  # Event-triggered Ruby functions receive a CloudEvents::Event::V1 object.
  # See https://cloudevents.github.io/sdk-ruby/latest/CloudEvents/Event/V1.html
  # The Firebase event payload can be obtained from the `data` field.
  payload = event.data

  logger.info "Function triggered by change to: #{event.source}"
  logger.info "Admin?: #{payload.fetch 'admin', false}"
  logger.info "Delta: #{payload['delta']}"
end

Étapes suivantes

Pour rechercher et filtrer des exemples de code pour d'autres produits Google Cloud, consultez l'explorateur d'exemples Google Cloud.