Azure Web PubSub Service SDK for Python

Real-time messaging with WebSocket connections at scale.

Installation

# Service SDK (server-side)
pip install azure-messaging-webpubsubservice

# Client SDK (for Python WebSocket clients)
pip install azure-messaging-webpubsubclient

Environment Variables

AZURE_WEBPUBSUB_CONNECTION_STRING=Endpoint=https://<name>.webpubsub.azure.com;AccessKey=...
AZURE_WEBPUBSUB_HUB=my-hub

Service Client (Server-Side)

Authentication

from azure.messaging.webpubsubservice import WebPubSubServiceClient

# Connection string
client = WebPubSubServiceClient.from_connection_string(
    connection_string=os.environ["AZURE_WEBPUBSUB_CONNECTION_STRING"],
    hub="my-hub"
)

# Entra ID
from azure.identity import DefaultAzureCredential

client = WebPubSubServiceClient(
    endpoint="https://<name>.webpubsub.azure.com",
    hub="my-hub",
    credential=DefaultAzureCredential()
)

Generate Client Access Token

# Token for anonymous user
token = client.get_client_access_token()
print(f"URL: {token['url']}")

# Token with user ID
token = client.get_client_access_token(
    user_id="user123",
    roles=["webpubsub.sendToGroup", "webpubsub.joinLeaveGroup"]
)

# Token with groups
token = client.get_client_access_token(
    user_id="user123",
    groups=["group1", "group2"]
)

Send to All Clients

# Send text
client.send_to_all(message="Hello everyone!", content_type="text/plain")

# Send JSON
client.send_to_all(
    message={"type": "notification", "data": "Hello"},
    content_type="application/json"
)

Send to User

client.send_to_user(
    user_id="user123",
    message="Hello user!",
    content_type="text/plain"
)

Send to Group

client.send_to_group(
    group="my-group",
    message="Hello group!",
    content_type="text/plain"
)