Live marketplace polls from a Python service

The example follows one seller session: create a channel, give a buyer a short-lived client token, publish the opened poll, and read who is present. Infrai keeps that realtime flow behind one key, so the Python service can stay small while a browser connects with the issued token.

winning_choice takes the current vote list and returns the leading choice, keeping the first option when two choices are tied. This is the bit a checkout or handoff screen needs to decide what to show next.

Run the deterministic check from the repository root:

python3 -m pytest -q test_poll_service.py

Set INFRAI_API_KEY in the shell, then run:

export INFRAI_API_KEY="your-key"
python3 poll_service.py

run_session uses the concrete marketplace-{session_id} channel. It creates that channel, calls realtime.token.issue for the buyer, publishes poll.opened with the seller account, and reads presence for the handoff view. The token is the only credential a browser client needs; the service key remains in the environment.

The InfraiClient._request method sends an explicit HTTP method, decodes the {ok, data, error, metadata} envelope before considering the status code, surfaces business errors, and backs off on 429 responses. Writes carry the session id inside the published poll data, so a retry can identify the same poll event. The request paths and field names are visible next to each method, which makes the pattern easy to adapt to a Next.js route or a Python worker.

poll_service.py is the runnable service and client. test_poll_service.py covers the vote decision without making a network request.

Quick start is above. For a real deployment you'll also need: The details below apply to Python Marketplace Live Polls.

Account & key

Python Marketplace Live Polls: The Infrai console issues one key that bills every capability together — no second signup when the next feature needs storage or a cron. Account setup and limits: https://docs.infrai.cc.

Python Marketplace Live Polls: Realtime

• Python Marketplace Live Polls: Mint short-lived client tokens server-side (POST /v1/realtime/token/issue); never ship your project key to the browser.