Observe meeting events with Python and the Google Meet REST API

This tutorial shows how to use the Google Meet REST API along with the Google Workspace Events API and Google Cloud Pub/Sub to observe and react to events in a Meet meeting space. The sample application records when conferences start and end, when participants join or leave, and when any generated meeting artifacts are available.

Instead of subscribing to a specific meeting space, you can instead subscribe to a Meet user to receive events for any meeting space that the user owns or organizes. For details, see Subscribe to Google Meet events in the Google Workspace Events API documentation.

Prerequisites

If you need any of these prerequisites turned on for your organization, ask your Google Workspace administrator to turn them on:

• A Google Workspace account with access to Google Meet.
• Access to create a Google Cloud project.
• Python 3 installed.
• The gcloud CLI installed.

Prepare your environment

This section shows how to create and configure your local environment and the Google Cloud project for this tutorial.

Create a working directory and Python virtual environment

To create and activate a new virtual environment, run the following commands in your terminal.

mkdir meet-tutorial
cd meet-tutorial
python3 -mvenv env
source env/bin/activate

mkdir meet-tutorial
cd meet-tutorial
python3 -mvenv env
env/bin/activate.bat

mkdir meet-tutorial
cd meet-tutorial
python3 -mvenv env
env/bin/activate.ps1

Create a Google Cloud project

Enable billing for the Google Cloud project

Set up authentication and authorization

Authentication and authorization lets the app access Meet REST API resources. User authorization is required to call the Meet REST API. This section hows you how to configure user credentials and request authorization.

Configure the OAuth consent screen and choose scopes

The following steps suggest placeholder information to configure the OAuth consent screen for your app. Before publishing the app externally, update this information.

1. In the Google Cloud console, go to Menu menu > APIs & Services > OAuth consent screen.

   Go to OAuth consent screen

2. Under User type, select Internal, then click Create.
3. In App name, enter Meet REST API Tutorial.
4. Complete the app registration form, then click Save and Continue.
5. Click Add or Remove Scopes. A panel appears with a list of scopes for each API that you've enabled in your Google Cloud project.
6. Under Manually add scopes, paste the following scopes:
   • https://www.googleapis.com/auth/meetings.space.created
7. Click Add to Table.
8. Click Update.
9. After selecting the scopes required by your app, click Save and Continue.
10. If you selected External for user type, add test users:
    1. Under Test users, click Add users.
    2. Enter your email address and any other authorized test users, then click Save and Continue.
11. Review your app registration summary. To make changes, click Edit. If the app registration looks OK, click Back to Dashboard.

Create a client ID

The client ID acts as credentials for your application during the OAuth 2.0 flows. Since the app runs locally, create a desktop client ID.

1. In the Google Cloud console, go to Menu menu > APIs & Services > Credentials.

   Go to Credentials

2. Click Create Credentials > OAuth client ID.
3. Click Application type > Desktop app.
4. In the Name field, type a name for the credential. This name is only shown in the Google Cloud console.
5. Click Create. The OAuth client created screen appears, showing your new Client ID and Client secret.
6. Click OK. The newly created credential appears under OAuth 2.0 Client IDs.

Install the Google auth libraries

Install the Google auth libraries:

pip install google-auth google-auth-oauthlib

Execute authorization

The Meet REST API requires user credentials in the form of an OAuth 2.0 access token. In this section, you implement the OAuth 2.0 flow to request an access token and a refresh token for the user.

1. In your working directory, create the file main.py and add the following contents:

   import os
   import json
   
   from google.auth.transport import requests
   from google.oauth2.credentials import Credentials
   from google_auth_oauthlib.flow import InstalledAppFlow
   
   def authorize() -> Credentials:
       """Ensure valid credentials for calling the Meet REST API."""
       CLIENT_SECRET_FILE = "./client_secret.json"
       credentials = None
   
       if os.path.exists('token.json'):
           credentials = Credentials.from_authorized_user_file('token.json')
   
       if credentials is None:
           flow = InstalledAppFlow.from_client_secrets_file(
               CLIENT_SECRET_FILE,
               scopes=[
                   'https://www.googleapis.com/auth/meetings.space.created',
               ])
           flow.run_local_server(port=0)
           credentials = flow.credentials
   
       if credentials and credentials.expired:
           credentials.refresh(requests.Request())
   
       if credentials is not None:
           with open("token.json", "w") as f:
               f.write(credentials.to_json())
   
       return credentials
   
   USER_CREDENTIALS = authorize()
   

2. To run the code, both the client ID and the secret created earlier are required. Copy the downloaded client secret file to the project working directory and rename it as client_secret.json.

3. If you'd like to test how authorization works, run the following command. The app prompts for authorization and creates a token.json file in the project working directory after the request is approved.

   python3 main.py
   

Add the Meet REST API

Now that the authorization code is complete, it's time to enable and call the Meet REST API.

Enable the APIs

While this section is focused on the Meet REST API, this tutorial also uses Google Cloud Pub/Sub and Google Workspace Events API.

Install the Meet REST API client library

Follow these steps to install the Meet REST API client library:

1. Run the command:

   pip install google-apps-meet
   

2. Edit the main.py file to import the client:

   from google.apps import meet_v2 as meet
   

Create a space

Now that the Meet REST API is available, define a function to create a meeting space that can be subscribed to.

Edit main.py and add:

def create_space() -> meet.Space:
    """Create a meeting space."""
    client = meet.SpacesServiceClient(credentials=USER_CREDENTIALS)
    request = meet.CreateSpaceRequest()
    return client.create_space(request=request)

Subscribe to events

To receive events about a meeting space, you create a subscription using the Google Workspace Events API. You must also create and subscribe to a Google Cloud Pub/Sub topic which serves as the notification endpoint where your app receives the events.

Configure Google Cloud Pub/Sub

To create and subscribe to a Pub/Sub topic:

Make note of the topic name and make sure the value for {project} is the Cloud project ID for your app. You'll use the topic name to create the Google Workspace subscription later.

Create a service account

Use the service account

After creating the service account, grant yourself access to impersonate the service account.

Install the Pub/Sub client library

1. Use pip to install the client library for Pub/Sub:

   pip install google-cloud-pubsub
   

2. Then edit main.py to import the client:

   from google.cloud import pubsub_v1
   

Create the Google Workspace subscription

Add the following code to main.py to define a method for subscribing to Meet events. This code subscribes to all events for a meeting space. When subscribed, events are posted to the Pub/Sub topic.

def subscribe_to_space(space_name: str = None, topic_name: str = None):
    """Subscribe to events for a meeting space."""
    session = requests.AuthorizedSession(USER_CREDENTIALS)
    body = {
        'targetResource': f"//meet.googleapis.com/{space_name}",
        "eventTypes": [
            "google.workspace.meet.conference.v2.started",
            "google.workspace.meet.conference.v2.ended",
            "google.workspace.meet.participant.v2.joined",
            "google.workspace.meet.participant.v2.left",
            "google.workspace.meet.recording.v2.fileGenerated",
            "google.workspace.meet.transcript.v2.fileGenerated",
        ],
        "payloadOptions": {
            "includeResource": False,
        },
        "notificationEndpoint": {
            "pubsubTopic": topic_name
        },
        "ttl": "86400s",
    }
    response = session.post("https://workspaceevents.googleapis.com/v1/subscriptions", json=body)
    return response

Next, add the corresponding code to pull and process the events.

Listen for and handle events

Continue to edit main.py and add the following sample code. This code implements the receiving side and uses the Google Cloud Pub/Sub API to pull events as they're made available. The various handler methods print information about the corresponding events.

def format_participant(participant: meet.Participant) -> str:
    """Formats a participant for display on the console."""
    if participant.anonymous_user:
        return f"{participant.anonymous_user.display_name} (Anonymous)"

    if participant.signedin_user:
        return f"{participant.signedin_user.display_name} (ID: {participant.signedin_user.user})"

    if participant.phone_user:
        return f"{participant.phone_user.display_name} (Phone)"

    return "Unknown participant"


def fetch_participant_from_session(session_name: str) -> meet.Participant:
    """Fetches the participant for a session."""
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    # Use the parent path of the session to fetch the participant details
    parsed_session_path = client.parse_participant_session_path(session_name)
    participant_resource_name = client.participant_path(
        parsed_session_path["conference_record"],
        parsed_session_path["participant"])
    return client.get_participant(name=participant_resource_name)


def on_conference_started(message: pubsub_v1.subscriber.message.Message):
    """Display information about a conference when started."""
    payload = json.loads(message.data)
    resource_name = payload.get("conferenceRecord").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    conference = client.get_conference_record(name=resource_name)
    print(f"Conference (ID {conference.name}) started at {conference.start_time.rfc3339()}")


def on_conference_ended(message: pubsub_v1.subscriber.message.Message):
    """Display information about a conference when ended."""
    payload = json.loads(message.data)
    resource_name = payload.get("conferenceRecord").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    conference = client.get_conference_record(name=resource_name)
    print(f"Conference (ID {conference.name}) ended at {conference.end_time.rfc3339()}")


def on_participant_joined(message: pubsub_v1.subscriber.message.Message):
    """Display information about a participant when they join a meeting."""
    payload = json.loads(message.data)
    resource_name = payload.get("participantSession").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    session = client.get_participant_session(name=resource_name)
    participant = fetch_participant_from_session(resource_name)
    display_name = format_participant(participant)
    print(f"{display_name} joined at {session.start_time.rfc3339()}")


def on_participant_left(message: pubsub_v1.subscriber.message.Message):
    """Display information about a participant when they leave a meeting."""
    payload = json.loads(message.data)
    resource_name = payload.get("participantSession").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    session = client.get_participant_session(name=resource_name)
    participant = fetch_participant_from_session(resource_name)
    display_name = format_participant(participant)
    print(f"{display_name} left at {session.end_time.rfc3339()}")


def on_recording_ready(message: pubsub_v1.subscriber.message.Message):
    """Display information about a recorded meeting when artifact is ready."""
    payload = json.loads(message.data)
    resource_name = payload.get("recording").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    recording = client.get_recording(name=resource_name)
    print(f"Recording available at {recording.drive_destination.export_uri}")


def on_transcript_ready(message: pubsub_v1.subscriber.message.Message):
    """Display information about a meeting transcript when artifact is ready."""
    payload = json.loads(message.data)
    resource_name = payload.get("transcript").get("name")
    client = meet.ConferenceRecordsServiceClient(credentials=USER_CREDENTIALS)
    transcript = client.get_transcript(name=resource_name)
    print(f"Transcript available at {transcript.docs_destination.export_uri}")


def on_message(message: pubsub_v1.subscriber.message.Message) -> None:
    """Handles an incoming event from the Google Cloud Pub/Sub API."""
    event_type = message.attributes.get("ce-type")
    handler = {
        "google.workspace.meet.conference.v2.started": on_conference_started,
        "google.workspace.meet.conference.v2.ended": on_conference_ended,
        "google.workspace.meet.participant.v2.joined": on_participant_joined,
        "google.workspace.meet.participant.v2.left": on_participant_left,
        "google.workspace.meet.recording.v2.fileGenerated": on_recording_ready,
        "google.workspace.meet.transcript.v2.fileGenerated": on_transcript_ready,
    }.get(event_type)

    try:
        if handler is not None:
            handler(message)
        message.ack()
    except Exception as error:
        print("Unable to process event")
        print(error)


def listen_for_events(subscription_name: str = None):
    """Subscribe to events on the subscription."""
    subscriber = pubsub_v1.SubscriberClient()
    with subscriber:
        future = subscriber.subscribe(subscription_name, callback=on_message)
        print("Listening for events")
        try:
            future.result()
        except KeyboardInterrupt:
            future.cancel()
    print("Done")

Finalize the code

Add the following code to main.py to call the methods to create the space, subscribe to events, and listen. Update the TOPIC_NAME and SUBSCRIPTION_NAME constants with your own topic and subscription names that you previously created.

1. Add the code to main.py:

   space = create_space()
   print(f"Join the meeting at {space.meeting_uri}")
   
   TOPIC_NAME = "projects/PROJECT_ID/topics/TOPIC_ID"
   SUBSCRIPTION_NAME = "projects/PROJECT_ID/subscriptions/SUBSCRIPTION_ID"
   
   subscription = subscribe_to_space(topic_name=TOPIC_NAME, space_name=space.name)
   listen_for_events(subscription_name=SUBSCRIPTION_NAME)
   

   Replace the following:

   • PROJECT_ID: The unique Cloud project ID for your app, such as my-sample-project-191923.

   • TOPIC_ID: The name of the Pub/Sub topic that you created in your Cloud project.

   • SUBSCRIPTION_ID: The name of your subscription, such as workspace-events-sub.

2. Run the program:

   python3 main.py
   

If you haven't previously run the program, it prompts for authorization the first time. Grant access to the application to call the Meet REST API. After the program successfully runs, you should see output similar to:

Join the meeting at https://meet.google.com/abc-mnop-xyz

Join the conference

To generate events for the application, join the conference using the URL displayed by the application. After you join, you can try these actions to trigger events:

• Leave and rejoin the meeting.
• Invite others or dial in with your phone.
• Enable recordings and transcripts.

Each of these activities generates an event that the application receives and logs to the Google Cloud console.

Use ctrl-c to interrupt the program when you're done.

Optional: Additional steps to try

The app logs basic details about the events. To continue exploring the Meet REST API, try modifying the application to perform these additional actions.

• Use the People API to retrieve additional information about signed-in participants.
• Use the Google Drive API to download recordings and transcripts.
• Instead of downloading transcripts from Google Drive, retrieve them using the structured transcript methods in the Meet REST API.

Optional: Clean up

To avoid incurring charges to your Google Cloud console account for the resources used in this tutorial, we recommend that you clean up any resources and projects created.

To delete the subscription:

To delete the topic:

To delete the project:

Related topics

• Learn about the types of Meet events to which you can subscribe.
• Learn more about what Google Meet REST API can do and review the reference documentation.
• Create a Google Workspace subscription to Meet meeting spaces or users using the Google Workspace Events API.
• To learn more about authentication, see Configure the OAuth consent screen and choose scopes.