matrx-connect
FastAPI connectivity layer for the Matrx ecosystem: auth middleware, streaming-response infrastructure, request-scoped AppContext, and the Emitter protocol. Despite the name, "connect" is about connecting a FastAPI app to the Matrx streaming + auth contract — not database connectivity.
Install
pip install matrx-connect
Python 3.12+ required. Depends only on matrx-utils from the Matrx family.
What's in the box
| Module | What it does |
|---|---|
matrx_connect.context.app_context |
AppContext dataclass + sealed tenant factories (require_tenant_context, tenant_system_context, tenant_resource_context) + ContextVar helpers |
matrx_connect.context.emitter_protocol |
Emitter protocol — every method any producer can call (send_chunk, send_reasoning, send_phase, send_data, send_info, send_warning, fatal_error, send_end, tool events, …) |
matrx_connect.context.events |
Pydantic event payload schemas shared with the frontend |
matrx_connect.emitters.stream_emitter |
StreamEmitter — the JSONL/NDJSON HTTP streaming implementation |
matrx_connect.emitters.console_emitter |
ConsoleEmitter — dev/test implementation that prints to stdout |
matrx_connect.middleware.auth |
AuthMiddleware — pluggable JWT + admin-token + fingerprint resolution, with a resolve_guest callback hook |
matrx_connect.streaming.response |
create_streaming_response(ctx, task, *args, ...) — the ONLY public entry point for streaming endpoints |
matrx_connect.dependencies |
context_dep reads AppContext; authenticated_resource_bootstrap authenticates a declared resource route and returns only its literal X-Organization-Id claim |
The streaming endpoint pattern
Every streaming route follows this exact shape. It's enforced across every repo that uses matrx-connect, so that the behavior of heartbeats, client disconnects, and error handling stays consistent:
from fastapi import APIRouter, Depends
from matrx_connect import AppContext, context_dep
from matrx_connect.streaming import create_streaming_response
router = APIRouter()
@router.post("/topics/{topic_id}/search")
async def trigger_search(topic_id: str, ctx: AppContext = Depends(context_dep)):
return create_streaming_response(
ctx, _run_search, topic_id,
initial_message="Starting search…", debug_label="ResearchSearch",
)
async def _run_search(emitter, topic_id: str):
# AppContext is already set on the ContextVar.
# Cancellation + exception handling are done for you.
result = await do_work(topic_id)
await emitter.send_data(SearchResult(...).model_dump())
await emitter.send_end()
What create_streaming_response does for you:
- Creates the
StreamEmitter, attaches it toAppContext, and pushesAppContextonto theContextVar. - Spawns the task as a background
asyncio.Task. - Catches
CancelledError(client disconnect) and generic exceptions — the latter are surfaced viaemitter.fatal_error(...). - Emits heartbeat keepalives while the task is running.
- Clears the
ContextVaron exit.
Your task function never touches set_app_context / clear_app_context / CancelledError. If you find yourself reaching for those symbols in application code, extend create_streaming_response instead.
Wiring the auth middleware
from fastapi import FastAPI
from matrx_connect.middleware.auth import AuthMiddleware
app = FastAPI()
app.add_middleware(
AuthMiddleware,
jwt_secret=settings.JWT_SECRET,
admin_token=settings.ADMIN_TOKEN,
admin_user_id=settings.ADMIN_USER_ID,
resolve_guest=my_guest_resolver, # optional callback for fingerprint-based guests
)
After this, every request has an AppContext on request.state.context and context_dep will hand it to any route handler that depends on it.
Resource handlers that authorize a named row after middleware admission use
authenticated_resource_bootstrap. Pair it with the exact
authenticated_resource_routes(app, authenticated_resource_bootstrap) output
when configuring AuthMiddleware; it defers organization pre-refusal for
those method/path declarations without creating an organization-free or tenant
context. The handler still owns row authorization.
Standalone-friendliness
matrx-connect has a single sibling dependency (matrx-utils, for verbose-logging). It assumes no ORM, no database, no Supabase — wire those in from your app. The Emitter is a typing.Protocol, so you can hand create_streaming_response any object that satisfies the shape.
Contributing
See CLAUDE.md for package-specific import rules and conventions. This package lives in the aidream monorepo at github.com/AI-Matrix-Engine/aidream-current.
License
MIT.
1 maintainer
Metadata
1 maintainer
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