Pemicu Google Cloud Firestore (generasi ke-1)

Fungsi Cloud Run dapat menangani peristiwa di Firestore pada project Google Cloud yang sama sebagai fungsi. Anda dapat membaca atau mengupdate Firestore sebagai respons terhadap peristiwa menggunakan metode API Firestore dan library klien.

Dalam siklus proses umum, fungsi Firestore melakukan hal-hal berikut:

  1. Menunggu perubahan pada dokumen tertentu.

  2. Terpicu ketika suatu peristiwa terjadi dan menjalankan tugasnya.

  3. Menerima objek data dengan snapshot dokumen yang terpengaruh. Untuk peristiwa write atau update, objek data berisi snapshot yang mewakili status dokumen sebelum dan setelah peristiwa pemicuan.

Jenis peristiwa

Firestore mendukung peristiwa create, update, delete, dan write. Peristiwa write mencakup semua perubahan pada dokumen.

Jenis peristiwa Pemicu
providers/cloud.firestore/eventTypes/document.create (default) Dipicu saat dokumen ditulisi untuk pertama kalinya.
providers/cloud.firestore/eventTypes/document.update Dipicu saat dokumen sudah ada dan nilainya berubah.
providers/cloud.firestore/eventTypes/document.delete Dipicu saat dokumen yang memuat data dihapus.
providers/cloud.firestore/eventTypes/document.write Dipicu saat dokumen dibuat, diperbarui, atau dihapus.

Karakter pengganti ditulis dalam pemicu menggunakan tanda kurung kurawal, seperti berikut: "projects/YOUR_PROJECT_ID/databases/(default)/documents/collection/{document_wildcard}"

Menentukan jalur dokumen

Untuk memicu fungsi Anda, tentukan jalur dokumen yang akan diproses. Fungsi hanya merespons perubahan dokumen, dan tidak dapat memantau kolom atau koleksi tertentu. Berikut adalah beberapa contoh jalur dokumen yang valid:

  • users/marie: pemicu valid. Memantau satu dokumen, /users/marie.

  • users/{username}: pemicu valid. Memantau semua dokumen pengguna. Karakter pengganti digunakan untuk memantau semua dokumen dalam koleksi.

  • users/{username}/addresses: pemicu tidak valid. Mengacu pada subkoleksi addresses, bukan dokumen.

  • users/{username}/addresses/home: pemicu valid. Memantau dokumen alamat rumah untuk semua pengguna.

  • users/{username}/addresses/{addressId}: pemicu valid. Memantau semua dokumen alamat.

Menggunakan karakter pengganti dan parameter

Jika tidak mengetahui dokumen spesifik yang ingin dipantau, gunakan {wildcard}, bukan ID dokumen:

  • users/{username} akan memproses perubahan pada semua dokumen pengguna.

Dalam contoh ini, saat kolom dalam dokumen pada users diubah, maka akan dicocokkan dengan karakter pengganti yang disebut {username}.

Jika dokumen dalam users memiliki subkoleksi, dan kolom di salah satu dokumen subkoleksi tersebut diubah, karakter pengganti {username} tidak akan terpicu.

Kecocokan karakter pengganti diekstrak dari jalur dokumen. Anda dapat menentukan karakter pengganti sebanyak yang Anda inginkan untuk mengganti koleksi eksplisit atau ID dokumen.

Struktur peristiwa

Pemicu ini memanggil fungsi Anda dengan peristiwa yang mirip dengan yang ditampilkan di bawah ini:

{
    "oldValue": { // Update and Delete operations only
        A Document object containing a pre-operation document snapshot
    },
    "updateMask": { // Update operations only
        A DocumentMask object that lists changed fields.
    },
    "value": {
        // A Document object containing a post-operation document snapshot
    }
}

Setiap objek Document berisi satu atau beberapa objek Value. Lihat dokumentasi Value untuk referensi jenis. Hal ini sangat berguna jika Anda menggunakan bahasa yang diketik (seperti Go) untuk menulis fungsi.

Contoh kode

Contoh Cloud Function di bawah ini mencetak kolom peristiwa Cloud Firestore yang memicu:

Node.js

/**
 * Background Function triggered by a change to a Firestore document.
 *
 * @param {!Object} event The Cloud Functions event.
 * @param {!Object} context Cloud Functions event metadata.
 */
exports.helloFirestore = (event, context) => {
  const triggerResource = context.resource;

  console.log(`Function triggered by event on: ${triggerResource}`);
  console.log(`Event type: ${context.eventType}`);

  if (event.oldValue && Object.keys(event.oldValue).length) {
    console.log('\nOld value:');
    console.log(JSON.stringify(event.oldValue, null, 2));
  }

  if (event.value && Object.keys(event.value).length) {
    console.log('\nNew value:');
    console.log(JSON.stringify(event.value, null, 2));
  }
};

Python

import json

def hello_firestore(data, context):
    """Triggered by a change to a Firestore document.
    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("\nOld value:")
    print(json.dumps(data["oldValue"]))

    print("\nNew value:")
    print(json.dumps(data["value"]))

Go


// Package hello contains a Cloud Function triggered by a Firestore event.
package hello

import (
	"context"
	"fmt"
	"log"
	"time"

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

// FirestoreEvent is the payload of a Firestore event.
type FirestoreEvent struct {
	OldValue   FirestoreValue `json:"oldValue"`
	Value      FirestoreValue `json:"value"`
	UpdateMask struct {
		FieldPaths []string `json:"fieldPaths"`
	} `json:"updateMask"`
}

// FirestoreValue holds Firestore fields.
type FirestoreValue struct {
	CreateTime time.Time `json:"createTime"`
	// Fields is the data for this value. The type depends on the format of your
	// database. Log the interface{} value and inspect the result to see a JSON
	// representation of your database fields.
	Fields     interface{} `json:"fields"`
	Name       string      `json:"name"`
	UpdateTime time.Time   `json:"updateTime"`
}

// HelloFirestore is triggered by a change to a Firestore document.
func HelloFirestore(ctx context.Context, e FirestoreEvent) 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("Old value: %+v", e.OldValue)
	log.Printf("New value: %+v", e.Value)
	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 FirebaseFirestore implements RawBackgroundFunction {
  private static final Logger logger = Logger.getLogger(FirebaseFirestore.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) {
    JsonObject body = gson.fromJson(json, JsonObject.class);
    logger.info("Function triggered by event on: " + context.resource());
    logger.info("Event type: " + context.eventType());

    if (body != null && body.has("oldValue")) {
      logger.info("Old value:");
      logger.info(body.get("oldValue").getAsString());
    }

    if (body != null && body.has("value")) {
      logger.info("New value:");
      logger.info(body.get("value").getAsString());
    }
  }
}

C#

using CloudNative.CloudEvents;
using Google.Cloud.Functions.Framework;
using Google.Events.Protobuf.Cloud.Firestore.V1;
using Microsoft.Extensions.Logging;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace FirebaseFirestore;

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

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

    public Task HandleAsync(CloudEvent cloudEvent, DocumentEventData data, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Function triggered by event on {subject}", cloudEvent.Subject);
        _logger.LogInformation("Event type: {type}", cloudEvent.Type);
        MaybeLogDocument("Old value", data.OldValue);
        MaybeLogDocument("New value", data.Value);

        // 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;
    }

    /// <summary>
    /// Logs the names and values of the fields in a document in a very simplistic way.
    /// </summary>
    private void MaybeLogDocument(string message, Document document)
    {
        if (document is null)
        {
            return;
        }

        // ConvertFields converts the Firestore representation into a .NET-friendly
        // representation.
        IReadOnlyDictionary<string, object> fields = document.ConvertFields();
        var fieldNamesAndTypes = fields
            .OrderBy(pair => pair.Key)
            .Select(pair => $"{pair.Key}: {pair.Value}");
        _logger.LogInformation(message + ": {fields}", string.Join(", ", fieldNamesAndTypes));
    }
}

Ruby

require "functions_framework"

# Triggered by a change to a Firestore document.
FunctionsFramework.cloud_event "hello_firestore" do |event|
  # The event parameter is a CloudEvents::Event::V1 object.
  # See https://cloudevents.github.io/sdk-ruby/latest/CloudEvents/Event/V1.html
  payload = event.data

  logger.info "Function triggered by change to: #{event.source}"
  logger.info "Old value: #{payload['oldValue']}"
  logger.info "New value: #{payload['value']}"
end

PHP


use Google\CloudFunctions\CloudEvent;

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

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

    $data = $cloudevent->getData();

    $resource = $data['resource'];
    fwrite($log, 'Function triggered by event on: ' . $resource . PHP_EOL);

    if (isset($data['oldValue'])) {
        fwrite($log, 'Old value: ' . json_encode($data['oldValue']) . PHP_EOL);
    }

    if (isset($data['value'])) {
        fwrite($log, 'New value: ' . json_encode($data['value']) . PHP_EOL);
    }
}

Contoh di bawha ini mengambil nilai yang ditambahkan oleh pengguna, mengubah string di lokasi tersebut menjadi huruf besar, dan mengganti nilai dengan string huruf besar:

Node.js

const Firestore = require('@google-cloud/firestore');

const firestore = new Firestore({
  projectId: process.env.GOOGLE_CLOUD_PROJECT,
});

// Converts strings added to /messages/{pushId}/original to uppercase
exports.makeUpperCase = event => {
  const resource = event.value.name;
  const affectedDoc = firestore.doc(resource.split('/documents/')[1]);

  const curValue = event.value.fields.original.stringValue;
  const newValue = curValue.toUpperCase();

  if (curValue !== newValue) {
    console.log(`Replacing value: ${curValue} --> ${newValue}`);

    return affectedDoc.set({
      original: newValue,
    });
  } else {
    // Value is already upper-case
    // Don't perform a(nother) write to avoid infinite loops
    console.log('Value is already upper-case.');
  }
};

Python

from google.cloud import firestore

client = firestore.Client()


# Converts strings added to /messages/{pushId}/original to uppercase
def make_upper_case(data, context):
    path_parts = context.resource.split("/documents/")[1].split("/")
    collection_path = path_parts[0]
    document_path = "/".join(path_parts[1:])

    affected_doc = client.collection(collection_path).document(document_path)

    cur_value = data["value"]["fields"]["original"]["stringValue"]
    new_value = cur_value.upper()

    if cur_value != new_value:
        print(f"Replacing value: {cur_value} --> {new_value}")
        affected_doc.set({"original": new_value})
    else:
        # Value is already upper-case
        # Don't perform a second write (which can trigger an infinite loop)
        print("Value is already upper-case.")

Go


// Package upper contains a Firestore Cloud Function.
package upper

import (
	"context"
	"fmt"
	"log"
	"os"
	"strings"
	"time"

	"cloud.google.com/go/firestore"
	firebase "firebase.google.com/go/v4"
)

// FirestoreEvent is the payload of a Firestore event.
type FirestoreEvent struct {
	OldValue   FirestoreValue `json:"oldValue"`
	Value      FirestoreValue `json:"value"`
	UpdateMask struct {
		FieldPaths []string `json:"fieldPaths"`
	} `json:"updateMask"`
}

// FirestoreValue holds Firestore fields.
type FirestoreValue struct {
	CreateTime time.Time `json:"createTime"`
	// Fields is the data for this value. The type depends on the format of your
	// database. Log an interface{} value and inspect the result to see a JSON
	// representation of your database fields.
	Fields     MyData    `json:"fields"`
	Name       string    `json:"name"`
	UpdateTime time.Time `json:"updateTime"`
}

// MyData represents a value from Firestore. The type definition depends on the
// format of your database.
type MyData struct {
	Original struct {
		StringValue string `json:"stringValue"`
	} `json:"original"`
}

// GOOGLE_CLOUD_PROJECT is automatically set by the Cloud Functions runtime.
var projectID = os.Getenv("GOOGLE_CLOUD_PROJECT")

// client is a Firestore client, reused between function invocations.
var client *firestore.Client

func init() {
	// Use the application default credentials.
	conf := &firebase.Config{ProjectID: projectID}

	// Use context.Background() because the app/client should persist across
	// invocations.
	ctx := context.Background()

	app, err := firebase.NewApp(ctx, conf)
	if err != nil {
		log.Fatalf("firebase.NewApp: %v", err)
	}

	client, err = app.Firestore(ctx)
	if err != nil {
		log.Fatalf("app.Firestore: %v", err)
	}
}

// MakeUpperCase is triggered by a change to a Firestore document. It updates
// the `original` value of the document to upper case.
func MakeUpperCase(ctx context.Context, e FirestoreEvent) error {
	fullPath := strings.Split(e.Value.Name, "/documents/")[1]
	pathParts := strings.Split(fullPath, "/")
	collection := pathParts[0]
	doc := strings.Join(pathParts[1:], "/")

	curValue := e.Value.Fields.Original.StringValue
	newValue := strings.ToUpper(curValue)
	if curValue == newValue {
		log.Printf("%q is already upper case: skipping", curValue)
		return nil
	}
	log.Printf("Replacing value: %q -> %q", curValue, newValue)

	data := map[string]string{"original": newValue}
	_, err := client.Collection(collection).Doc(doc).Set(ctx, data)
	if err != nil {
		return fmt.Errorf("Set: %w", err)
	}
	return nil
}

Java


import com.google.cloud.firestore.Firestore;
import com.google.cloud.firestore.FirestoreOptions;
import com.google.cloud.firestore.SetOptions;
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.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;

public class FirebaseFirestoreReactive implements RawBackgroundFunction {

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

  private static final Logger logger = Logger.getLogger(FirebaseFirestoreReactive.class.getName());
  private static final Firestore FIRESTORE = FirestoreOptions.getDefaultInstance().getService();

  private final Firestore firestore;

  public FirebaseFirestoreReactive() {
    this(FIRESTORE);
  }

  FirebaseFirestoreReactive(Firestore firestore) {
    this.firestore = firestore;
  }

  @Override
  public void accept(String json, Context context) {
    // Get the recently-written value
    JsonObject body = gson.fromJson(json, JsonObject.class);
    JsonObject tempJson = body.getAsJsonObject("value");

    // Verify that value.fields.original.stringValue exists
    String currentValue = null;
    if (tempJson != null) {
      tempJson = tempJson.getAsJsonObject("fields");
    }
    if (tempJson != null) {
      tempJson = tempJson.getAsJsonObject("original");
    }
    if (tempJson != null && tempJson.has("stringValue")) {
      currentValue = tempJson.get("stringValue").getAsString();
    }
    if (currentValue == null) {
      throw new IllegalArgumentException("Malformed JSON: " + json);
    }

    // Convert recently-written value to ALL CAPS
    String newValue = currentValue.toUpperCase(Locale.getDefault());

    // Update Firestore DB with ALL CAPS value
    Map<String, String> newFields = Map.of("original", newValue);

    String affectedDoc = context.resource().split("/documents/")[1].replace("\"", "");

    if (!currentValue.equals(newValue)) {
      // The stored value needs to be updated
      // Write the upper-cased value to Firestore
      logger.info(String.format("Replacing value: %s --> %s", currentValue, newValue));
      try {
        FIRESTORE.document(affectedDoc).set(newFields, SetOptions.merge()).get();
      } catch (ExecutionException | InterruptedException e) {
        logger.log(Level.SEVERE, "Error updating Firestore document: " + e.getMessage(), e);
      }
    } else {
      // The stored value is already upper-case, and doesn't need updating.
      // (Don't perform a "second" write, since that could trigger an infinite loop.)
      logger.info(String.format("Value is already upper-case."));
    }
  }
}

C#

using CloudNative.CloudEvents;
using Google.Cloud.Firestore;
using Google.Cloud.Functions.Framework;
using Google.Cloud.Functions.Hosting;
using Google.Events.Protobuf.Cloud.Firestore.V1;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace FirestoreReactive;

public class Startup : FunctionsStartup
{
    public override void ConfigureServices(WebHostBuilderContext context, IServiceCollection services) =>
        services.AddSingleton(FirestoreDb.Create());
}

// Register the startup class to provide the Firestore dependency.
[FunctionsStartup(typeof(Startup))]
public class Function : ICloudEventFunction<DocumentEventData>
{
    private readonly ILogger _logger;
    private readonly FirestoreDb _firestoreDb;

    public Function(ILogger<Function> logger, FirestoreDb firestoreDb) =>
        (_logger, _firestoreDb) = (logger, firestoreDb);

    public async Task HandleAsync(CloudEvent cloudEvent, DocumentEventData data, CancellationToken cancellationToken)
    {
        // Get the recently-written value. This expression will result in a null value
        // if any of the following is true:
        // - The event doesn't contain a "new" document
        // - The value doesn't contain a field called "original"
        // - The "original" field isn't a string
        string currentValue = data.Value?.ConvertFields().GetValueOrDefault("original") as string;
        if (currentValue is null)
        {
            _logger.LogWarning($"Event did not contain a suitable document");
            return;
        }

        string newValue = currentValue.ToUpperInvariant();
        if (newValue == currentValue)
        {
            _logger.LogInformation("Value is already upper-cased; no replacement necessary");
            return;
        }

        // The CloudEvent subject is "documents/x/y/...".
        // The Firestore SDK FirestoreDb.Document method expects a reference relative to
        // "documents" (so just the "x/y/..." part). This may be simplified over time.
        if (cloudEvent.Subject is null || !cloudEvent.Subject.StartsWith("documents/"))
        {
            _logger.LogWarning("CloudEvent subject is not a document reference.");
            return;
        }
        string documentPath = cloudEvent.Subject.Substring("documents/".Length);

        _logger.LogInformation("Replacing '{current}' with '{new}' in '{path}'", currentValue, newValue, documentPath);
        await _firestoreDb.Document(documentPath).UpdateAsync("original", newValue, cancellationToken: cancellationToken);
    }
}

Ruby

require "functions_framework"

FunctionsFramework.on_startup do
  # Lazily construct a Firestore client when needed, and reuse it on
  # subsequent calls.
  set_global :firestore_client do
    require "google/cloud/firestore"
    Google::Cloud::Firestore.new project_id: ENV["GOOGLE_CLOUD_PROJECT"]
  end
end

# Converts strings added to /messages/{pushId}/original to uppercase
FunctionsFramework.cloud_event "make_upper_case" 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 event data.
  cur_value = event.data["value"]["fields"]["original"]["stringValue"]

  # Compute new value and determine whether it needs to be modified.
  # If the value is already upper-case, don't perform another write,
  # to avoid infinite loops.
  new_value = cur_value.upcase
  if cur_value == new_value
    logger.info "Value is already upper-case"
    return
  end

  # Use the Firestore client library to update the value.
  # The document name can be obtained from the event subject.
  logger.info "Replacing value: #{cur_value} --> #{new_value}"
  doc_name = event.subject.split("documents/").last
  affected_doc = global(:firestore_client).doc doc_name
  new_doc_data = { original: new_value }
  affected_doc.set new_doc_data, merge: false
end

PHP


use Google\Cloud\Firestore\FirestoreClient;
use Google\CloudFunctions\CloudEvent;

function firebaseReactive(CloudEvent $cloudevent)
{
    $log = fopen(getenv('LOGGER_OUTPUT') ?: 'php://stderr', 'wb');
    $data = $cloudevent->getData();

    $resource = $data['value']['name'];

    $db = new FirestoreClient();

    $docPath = explode('/documents/', $resource)[1];

    $affectedDoc = $db->document($docPath);

    $curValue = $data['value']['fields']['original']['stringValue'];
    $newValue = strtoupper($curValue);

    if ($curValue !== $newValue) {
        fwrite($log, 'Replacing value: ' . $curValue . ' --> ' . $newValue . PHP_EOL);

        $affectedDoc->set(['original' => $newValue]);
    } else {
        // Value is already upper-case
        // Don't perform another write (it might cause an infinite loop)
        fwrite($log, 'Value is already upper-case.' . PHP_EOL);
    }
}

Men-deploy fungsi Anda

Perintah gcloud berikut men-deploy fungsi yang dipicu oleh peristiwa penulisan pada /messages/{pushId} dokumen:

gcloud functions deploy FUNCTION_NAME \
  --no-gen2 \
  --entry-point ENTRY_POINT \
  --runtime RUNTIME \
  --set-env-vars GOOGLE_CLOUD_PROJECT=YOUR_PROJECT_ID \
  --trigger-event "providers/cloud.firestore/eventTypes/document.write" \
  --trigger-resource "projects/YOUR_PROJECT_ID/databases/(default)/documents/messages/{pushId}"
Argumen Deskripsi
FUNCTION_NAME Nama Cloud Function yang terdaftar yang sedang Anda deploy. Ini dapat berupa nama fungsi dalam kode sumber Anda, atau string arbitrer. Jika FUNCTION_NAME adalah string arbitrer, Anda harus menyertakan flag --entry-point.
--entry-point ENTRY_POINT Nama fungsi atau class dalam kode sumber Anda. Opsional, kecuali jika Anda tidak menggunakan FUNCTION_NAME untuk menentukan fungsi dalam kode sumber yang akan dijalankan selama deployment. Dalam hal ini, Anda harus menggunakan --entry-point untuk memberikan nama fungsi yang dapat dieksekusi.
--runtime RUNTIME Nama runtime yang Anda gunakan. Untuk daftar lengkapnya, lihat referensi gcloud.
--set-env-vars GOOGLE_CLOUD_PROJECT=YOUR_PROJECT_ID ID unik project sebagai lingkungan runtime variabel.
--trigger-event NAME Jenis peristiwa yang akan dipantau oleh fungsi (salah satu dari write, create, update, atau delete).
--trigger-resource NAME Lokasi database yang sepenuhnya memenuhi syarat yang akan dipantau oleh fungsi. Ini harus sesuai dengan format berikut: "projects/YOUR_PROJECT_ID/databases/(default)/documents/PATH" Teks {pushId} adalah parameter karakter pengganti yang dijelaskan di atas dalam Menentukan jalur dokumen.

Batasan

Perhatikan batasan berikut untuk pemicu Firestore untuk fungsi Cloud Run:

  • Fungsi Cloud Run (generasi ke-1) mengharuskan "(default)" yang ada database dalam mode native Firestore. Tidak mendukung database bernama Firestore atau mode Datastore. Gunakan fungsi Cloud Run (generasi ke-2) untuk mengonfigurasi peristiwa dalam kasus tersebut.
  • Pengurutan tidak dijamin. Perubahan cepat dapat memicu pemanggilan fungsi dalam urutan yang tidak terduga.
  • Peristiwa dikirim setidaknya satu kali, tetapi satu peristiwa dapat menghasilkan beberapa pemanggilan fungsi. Hindari mengandalkan mekanisme tepat satu kali, dan tulis fungsi idempoten.
  • Firestore dalam mode Datastore memerlukan fungsi Cloud Run (generasi ke-2). Fungsi Cloud Run (generasi ke-1) tidak mendukung mode Datastore.
  • Pemicu dikaitkan dengan satu database. Anda tidak dapat membuat pemicu yang cocok dengan beberapa database.
  • Menghapus database tidak secara otomatis menghapus pemicu untuk database tersebut. Pemicu berhenti mengirim peristiwa, tetapi akan tetap ada sampai Anda menghapus pemicu.
  • Jika peristiwa yang cocok melebihi ukuran permintaan maksimum, mungkin tidak dikirimkan ke fungsi Cloud Run (generasi ke-1).
    • Peristiwa yang tidak terkirim karena ukuran permintaan akan dicatat dalam log platform dan diperhitungkan terhadap penggunaan log untuk project.
    • Anda dapat menemukan log ini di Logs Explorer dengan pesan "Event dapat mengirim ke Cloud function karena ukuran melebihi batas untuk generasi ke-1..." dengan tingkat keparahan error. Anda dapat menemukan nama fungsi di bawah kolom functionName. Jika kolom receiveTimestamp masih berada dalam waktu satu jam dari sekarang, Anda dapat menyimpulkan konten peristiwa yang sebenarnya dengan membaca dokumen yang dimaksud menggunakan snapshot sebelum dan setelah stempel waktu.
    • Untuk menghindari peristiwa seperti ini, Anda dapat:
      • Bermigrasi dan mengupgrade ke fungsi Cloud Run (generasi ke-2)
      • Memperkecil dokumen
      • Menghapus fungsi Cloud Run yang dimaksud
    • Anda dapat menonaktifkan logging itu sendiri menggunakan pengecualian, tetapi perhatikan bahwa peristiwa yang melanggar tidak akan dikirim.