dataceen-client 0.0.3

Python client for Dataceen GraphQL + gRPC subscription APIs

dataceen-client (Python)

Python client for the Dataceen GraphQL + gRPC subscription APIs. Parallel to the C# (DataceenClient/) and TypeScript (DataceenClientTs/) reference clients — feature-parity verified against the same Thomas/CandyShopModel/All fixtures.

Status: 0.0.1 alpha. 88 unit tests green. Not yet on PyPI.

Install

python -m venv .venv
.venv\Scripts\activate            # PowerShell
pip install -e ".[dev]"

Requires Python 3.11+ (typing.NotRequired, generic TypedDict).

Configure

Copy .env.example to .env at the repo root and fill in real Azure AD credentials. The example matches the C# appsettings.json's AllClient section.

Quick start

import asyncio
from dataceen_client import DataceenClient, load_config_from_env
from dataceen_client.runtime import do_find

async def main():
    cfg = load_config_from_env()
    async with DataceenClient(cfg) as client:
        result = await do_find(
            client,
            "Customer",
            size=5,
            filter={"CustomerId": {"like": "cst"}},
            fields={
                "_id": True,
                "CustomerId": True,
                "CustomerPlacedOrder": {"Order": {"OrderId": True}},
            },
            order_by=[{"CustomerId": "Ascending"}],
        )
        for item in result["Items"]:
            print(item)

asyncio.run(main())

After running codegen, replace do_find(client, "Customer", ...) with the typed AllClient(client).Customer.find(...).

Subscriptions

async with DataceenClient(cfg) as client:
    sub = client.create_subscription(
        topics=["Customer"],
        baseload_topics=["Customer"],
        start_mode="POSITION_BEGINNING",
        include_complete=True,
    )

    async def on_customer(evt):
        if evt.event_type == "BASELOAD_EVENT":
            ...  # evt.complete is parsed JSON
        elif evt.event_type == "SUBSCRIPTION_EVENT":
            ...  # live event

    sub.on("Customer", on_customer)
    await client.subscribe(sub)   # blocks until sub.cancel()

Codegen

python -m tools.codegen.src.cli fetch          # cache schema.json
python -m tools.codegen.src.cli emit Customer  # Customer + everything it references
python -m tools.codegen.src.cli emit-all       # whole model

Output → src/dataceen_client/generated/ (gitignored). Per entity you get typed TypedDicts for read/create/filter/fields, a change-tracked Update class, and an <Entity>Client wrapping the runtime helpers; AllClient aggregates the top-level entities.

Codegen runs from a source checkout — it is intentionally not part of the published wheel (only the runtime dataceen_client package is shipped).

Tests

pytest                       # 88 unit tests, ~1.7s
RUN_INTEGRATION=1 pytest     # also run live-backend integration tests (needs .env)

Example app

End-to-end example against the live backend:

python -m examples.candy_shop.find
python -m examples.candy_shop.search_and_aggregate
python -m examples.candy_shop.subscriber
python -m examples.candy_shop.program                    # full read-only orchestrator
RUN_DESTRUCTIVE=1 python -m examples.candy_shop.program  # also create/update/delete

Docs

• docs/plan.md — phase plan
• docs/decisions.md — decisions and motivation
• docs/progress.md — live status
• docs/dsl-comparison.md — why pure-dict DSL for Python
• docs/porting-guide.md — Python-specific amendments to the canonical guide
• docs/release.md — version-bump and publish runbook

License

Proprietary — see LICENSE.