Google Analytics for Firebase Triggers

Beta

This feature is covered by the Pre-GA Offerings Terms of the Google Cloud Platform Terms of Service. Pre-GA features may have limited support, and changes to pre-GA features may not be compatible with other pre-GA versions. For more information, see the launch stage descriptions.

Specifically, note that CloudEvents that are generated by Beta triggers may change format over time. The Source and Subject attributes, additional extension attributes, and the data (payload) format are all subject to change.

Google Analytics for Firebase provides event reports that help you understand how users interact with your app. With Cloud Functions, you can access logged conversion events and trigger functions based on these events in the same Cloud project as the function.

Only conversion events are supported by Cloud Functions. You can specify which events are conversion events in the Events tab of the Firebase console's Analytics pane.

Note: Unlike most other Cloud Functions events, Google Analytics for Firebase events are not real-time and may be delayed. See this blog post for more information.

Event types

Google Analytics for Firebase triggers the log event. This is a powerful event type, since any action that a user takes in your app can be logged and in turn trigger a function.

Event Type	Trigger
providers/google.firebase.analytics/eventTypes/event.log	Triggered when a conversion event is logged.

Cloud Functions can respond to the logging of a Google Analytics for Firebase conversion event. For instance, if a user makes an in-app purchase, an in_app_purchase conversion event is logged and can be consumed by Cloud Functions.

Event structure

This trigger invokes your function with an event similar to the one shown below:

{
    "eventDim": [ // Contains a single event
        {
            "date": "20090213",
            "name": "screen_view",
            "params": {
                "firebase_conversion": {
                    "intValue": "1"
                },
                "firebase_event_origin": {
                    "stringValue": "auto"
                },
                "firebase_previous_class": {
                    "stringValue": "MainActivity"
                },
                "firebase_previous_id": {
                    "intValue": "1928209043426257906"
                },
                "firebase_previous_screen": {
                    "stringValue": "id-D-D"
                },
                "firebase_screen": {
                    "stringValue": "id-C-C"
                },
                "firebase_screen_class": {
                    "stringValue": "MainActivity"
                },
                "firebase_screen_id": {
                    "intValue": "1234567890000"
                }
            },
            "previousTimestampMicros": "1234567890000",
            "timestampMicros": "1234567890000"
        }
    ],
    "userDim": {
        // A UserDimensions object
    }
}

User information such as application information or device information can be found in the userDim property. Information about the logged event can be found in the eventDim array. The objects contained in that array include a name field that holds the conversion event name (such as in_app_purchase). Custom fields set up in Google Analytics for Firebase also appear here.

Code sample

Use the following snippet to process this response:

Node.js

functions/firebase/index.js

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/**
 * Triggered by a Google Analytics for Firebase log event.
 *
 * @param {!Object} event The Cloud Functions event.
 */
exports.helloAnalytics = event => {
  const {resource} = event;
  console.log(`Function triggered by the following event: ${resource}`);

  const [analyticsEvent] = event.data.eventDim;
  console.log(`Name: ${analyticsEvent.name}`);
  console.log(`Timestamp: ${new Date(analyticsEvent.timestampMicros / 1000)}`);

  const userObj = event.data.userDim;
  console.log(`Device Model: ${userObj.deviceInfo.deviceModel}`);
  console.log(`Location: ${userObj.geoInfo.city}, ${userObj.geoInfo.country}`);
};

Python

functions/firebase/main.py

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from datetime import datetime
def hello_analytics(data, context):
    """ Triggered by a Google Analytics for Firebase log event.
     Args:
            data (dict): The event payload.
            context (google.cloud.functions.Context): Metadata for the event.
    """
    trigger_resource = context.resource
    print(f'Function triggered by the following event: {trigger_resource}')

    event = data["eventDim"][0]
    print(f'Name: {event["name"]}')

    event_timestamp = int(event["timestampMicros"][:-6])
    print(f'Timestamp: {datetime.utcfromtimestamp(event_timestamp)}')

    user_obj = data["userDim"]
    print(f'Device Model: {user_obj["deviceInfo"]["deviceModel"]}')

    geo_info = user_obj["geoInfo"]
    print(f'Location: {geo_info["city"]}, {geo_info["country"]}')

Go

functions/console_snippets/google_analytics/google_analytics.go

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// Package p contains a Google Analytics for Firebase Cloud Function.
package p

import (
	"context"
	"fmt"
	"log"

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

// AnalyticsEvent is the payload of an Analytics log event.
type AnalyticsEvent struct {
	EventDimensions []EventDimensions `json:"eventDim"`
	UserDimensions  interface{}       `json:"userDim"`
}

// EventDimensions holds Analytics event dimensions.
type EventDimensions struct {
	Name                    string      `json:"name"`
	Date                    string      `json:"date"`
	TimestampMicros         string      `json:"timestampMicros"`
	PreviousTimestampMicros string      `json:"previousTimestampMicros"`
	Params                  interface{} `json:"params"`
}

// HelloAnalytics handles Firebase Mobile Analytics log events.
func HelloAnalytics(ctx context.Context, e AnalyticsEvent) error {
	meta, err := metadata.FromContext(ctx)
	if err != nil {
		return fmt.Errorf("metadata.FromContext: %v", err)
	}
	log.Printf("Function triggered by Google Analytics event: %v", meta.Resource)
	log.Printf("%+v", e)
	return nil
}

C#

functions/firebase/FirebaseAnalytics/Function.cs

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

namespace FirebaseAnalytics
{
    public class Function : ICloudEventFunction<AnalyticsLogData>
    {
        private readonly ILogger _logger;

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

        public Task HandleAsync(CloudEvent cloudEvent, AnalyticsLogData data, CancellationToken cancellationToken)
        {
            _logger.LogInformation("Event source: {source}", cloudEvent.Source);
            _logger.LogInformation("Event count: {count}", data.EventDim.Count);

            var firstEvent = data.EventDim.FirstOrDefault();
            if (firstEvent is object)
            {
                _logger.LogInformation("First event name: {name}", firstEvent.Name);
                DateTimeOffset timestamp = DateTimeOffset.FromUnixTimeMilliseconds(firstEvent.TimestampMicros / 1000);
                _logger.LogInformation("First event timestamp: {timestamp:u}", timestamp);
            }

            var userObject = data.UserDim;
            if (userObject is object)
            {
                _logger.LogInformation("Device model: {device}", userObject.DeviceInfo?.DeviceModel);
                _logger.LogInformation("Location: {city}, {country}", userObject.GeoInfo?.City, userObject.GeoInfo.Country);
            }
            // 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;
        }
    }
}

Ruby

functions/firebase/analytics/app.rb

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require "functions_framework"

# Triggered by a Google Analytics for Firebase log event.
FunctionsFramework.cloud_event "hello_analytics" 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 Analytics event payload can be obtained from the `data` field.
  payload = event.data

  logger.info "Function triggered by the following event: #{event.source}"

  event = payload["eventDim"].first
  logger.info "Name: #{event['name']}"

  event_timestamp = Time.at(event["timestampMicros"].to_i / 1_000_000).utc
  logger.info "Timestamp: #{event_timestamp.strftime '%Y-%m-%dT%H:%M:%SZ'}"

  user_obj = payload["userDim"]
  logger.info "Device Model: #{user_obj['deviceInfo']['deviceModel']}"

  geo_info = user_obj["geoInfo"]
  logger.info "Location: #{geo_info['city']}, #{geo_info['country']}"
end

PHP

functions/firebase_analytics/index.php

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use Google\CloudFunctions\CloudEvent;

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

    $data = $cloudevent->getData();

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

    $analyticsEvent = $data['eventDim'][0];
    $unixTime = $analyticsEvent['timestampMicros'] / 1000;

    fwrite($log, 'Name: ' . $analyticsEvent['name'] . PHP_EOL);
    fwrite($log, 'Timestamp: ' . gmdate("Y-m-d\TH:i:s\Z", $unixTime) . PHP_EOL);

    $userObj = $data['userDim'];
    fwrite($log, sprintf(
        'Location: %s, %s' . PHP_EOL,
        $userObj['geoInfo']['city'],
        $userObj['geoInfo']['country']
    ));

    fwrite($log, 'Device Model: %s' . $userObj['deviceInfo']['deviceModel'] . PHP_EOL);
}

Deploying your function

To deploy your function, specify the event type and the project in which you have Firebase Auth configured. In the console, there is a field for Event Type which contains log—the only option—and Log Event Name, which is the conversion event that will trigger the function.

On the command line, specific strings must be used to specify these parameters. The following gcloud command deploys a function that triggers when a user makes an in-app purchase:

gcloud functions deploy FUNCTION_NAME \
  --entry-point ENTRY_POINT \
  --trigger-event providers/google.firebase.analytics/eventTypes/event.log \
  --trigger-resource projects/YOUR_PROJECT_ID/events/in_app_purchase \
  --runtime RUNTIME

Note: When you deploy a function using the gcloud command-line tool, the command must include the name of the function contained in your code that you want the deploy command to execute. You can specify that function using either FUNCTION_NAME or the optional --entry-point flag, depending on the needs of your implementation. See Deploy using the gcloud tool for more discussion of this topic.

Argument	Description
FUNCTION_NAME	The registered name of the Cloud Function you are deploying. This can either be the name of a function in your source code, or an arbitrary string. If FUNCTION_NAME is an arbitrary string, then you must include the --entry-point flag.
--entry-point ENTRY_POINT	The name of a function or class in your source code. Optional, unless you did not use FUNCTION_NAME to specify the function in your source code to be executed during deployment. In that case, you must use --entry-point to supply the name of the executable function.
--trigger-event NAME	The name of the event type that the function wishes to receive. For Google Analytics for Firebase, this is always providers/google.firebase.analytics/eventTypes/event.log.
--trigger-resource NAME	The fully qualified Google Analytics event name, including your project information. This should take the form: projects/YOUR_PROJECT_ID/events/CONVERSION_EVENT_NAME
--runtime RUNTIME	The name of the runtime you are using. For a complete list, see the gcloud reference.