Google Looker connection

Run Looker queries and trigger PDTs from a task via a managed Leoflow Connection and the Google provider’s LookerHook. The conn_type is gcp_looker. A connection has no password — the API3 client_id and client_secret live in Extra.

The conn_type has an underscore, so the delivered URI scheme is normalized to gcp-looker (Airflow does the same).

Declare the provider

# leoflow.yaml
dag_id: looker_pdt
connectors:
  - gcp_looker

Fields the UI asks for

The client_id / client_secret Extra round-trip under the normalized gcp-looker scheme is pinned by TestGCPLookerConnectionURIShapeIntegration.

Example DAG (copy-paste)

Docs-only recipe (needs a real Looker instance). The hook is imported inside the task — a top-level provider import fails the compile (see Installing a connector’s provider).

# dag.py
from __future__ import annotations

from airflow.sdk import DAG, task


@task
def build_pdt() -> None:
    from airflow.providers.google.cloud.hooks.looker import LookerHook

    hook = LookerHook(looker_conn_id="gcp_looker_default")
    print("build_pdt: starting PDT build via LookerHook(gcp_looker_default)")
    materialization_id = hook.start_pdt_build(model="my_model", view="my_view")
    print(f"build_pdt: materialization {materialization_id}")


with DAG("looker_pdt", schedule=None, catchup=False, tags=["example"]):
    build_pdt()

# leoflow.yaml
schema_version: "1.0"
dag_id: looker_pdt
description: Build a Looker PDT via LookerHook.
owner: examples
tags:
  - example
python_version: "3.11"
connectors:
  - gcp_looker

Run it

1. Admin → Connections → +, type gcp_looker. Set the instance URL in Host and the API3 client_id / client_secret in Extra.
2. leoflow lite path/to/this/dag → trigger looker_pdt.

Security notes

• Scope the API3 credentials to a dedicated service account and rotate them regularly; the Extra is encrypted at rest and never echoed back.
• Never print() the URI — it carries the API3 secret.

Related

• docs/connections/index.md — Installing a connector’s provider.
• ADR 0019 / 0021 — secret encryption + agent delivery.