wehub-resource-sync
a7d6d88f6f
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282 lines
11 KiB
Python
282 lines
11 KiB
Python
"""In-process ASGI fake of the v3 protocol endpoints.
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Mirrors the production endpoints just closely enough to validate the client:
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- POST /threads/{thread_id}/commands
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- POST /threads/{thread_id}/stream/events
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- GET /threads/{thread_id}/state
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- GET /assistants/{assistant_id}/graph
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"""
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from __future__ import annotations
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import asyncio
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from collections.abc import AsyncIterator
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from dataclasses import dataclass
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from typing import Any
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import httpx
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import orjson
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from starlette.applications import Starlette
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from starlette.requests import Request
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from starlette.responses import JSONResponse, Response, StreamingResponse
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from starlette.routing import Route
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class _AsyncSseByteStream(httpx.AsyncByteStream):
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"""Async SSE byte stream that supports mid-stream errors via `fail_after`."""
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def __init__(self, script: _StreamScript) -> None:
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self._script = script
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async def __aiter__(self) -> AsyncIterator[bytes]:
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for index, event in enumerate(self._script.events, start=1):
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if self._script.delay:
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await asyncio.sleep(self._script.delay)
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payload = orjson.dumps(event).decode()
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yield f"id: {event.get('event_id', '')}\n".encode()
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yield f"event: message\ndata: {payload}\n\n".encode()
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if self._script.fail_after is not None and index >= self._script.fail_after:
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raise httpx.ReadError("scripted async stream failure")
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class _CountedAsyncSseByteStream(httpx.AsyncByteStream):
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"""Wraps `_AsyncSseByteStream` and decrements the server's open stream counter."""
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def __init__(self, script: _StreamScript, server: Any) -> None:
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self._inner = _AsyncSseByteStream(script)
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self._server = server
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async def __aiter__(self) -> AsyncIterator[bytes]:
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try:
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async for chunk in self._inner:
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yield chunk
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finally:
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self._server.open_event_streams -= 1
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@dataclass
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class _StreamScript:
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events: list[dict[str, Any]]
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delay: float = 0.0
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fail_after: int | None = None
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class FakeServer:
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"""Holds scripted state for tests and exposes a Starlette app.
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Attributes:
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received_commands: every command body posted to /commands, in order.
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scripted_events: events the next /stream/events call will replay.
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stream_request_bodies: bodies posted to /stream/events, in order.
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command_request_headers: headers from each POST to /commands, in order.
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stream_request_headers_list: headers from each POST to /stream/events, in order.
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state: the `ThreadState`-shaped dict returned by GET /threads/{thread_id}/state.
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state_request_count: number of times the state endpoint has been called.
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state_request_headers: headers from each GET to /threads/{thread_id}/state, in order.
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"""
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def __init__(self) -> None:
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self.received_commands: list[dict[str, Any]] = []
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self.scripted_events: list[dict[str, Any]] = []
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self.stream_request_bodies: list[dict[str, Any]] = []
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self.command_request_headers: list[dict[str, str]] = []
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self.stream_request_headers_list: list[dict[str, str]] = []
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self._stream_delay: float = 0.0
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self._app: Starlette | None = None
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self.open_event_streams = 0
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self._open_event_streams_max = 0
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self.state: dict[str, Any] = {}
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self.state_request_count: int = 0
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self.state_request_headers: list[dict[str, str]] = []
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self._stream_scripts: list[_StreamScript] = []
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self._command_response: dict[str, Any] | None = None
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self.transport: httpx.MockTransport = httpx.MockTransport(self._handle_request)
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self.graph_response: dict[str, Any] = {
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"nodes": [{"id": "agent", "type": "runnable", "data": {"name": "agent"}}],
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"edges": [],
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}
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self.graph_request_params: list[dict[str, str]] = []
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self.graph_request_headers: list[dict[str, str]] = []
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def script(
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self,
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events: list[dict[str, Any]],
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*,
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delay: float = 0.0,
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fail_after: int | None = None,
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) -> None:
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"""Set the events the next /stream/events calls will replay."""
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self.scripted_events = list(events)
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self._stream_delay = delay
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self._stream_scripts = [
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_StreamScript(events=list(events), delay=delay, fail_after=fail_after)
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]
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def script_sequence(self, scripts: list[_StreamScript]) -> None:
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"""Set per-open stream scripts consumed in order by /stream/events."""
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self._stream_scripts = list(scripts)
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self.scripted_events = []
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def script_command_response(self, response: dict[str, Any]) -> None:
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"""Set the command envelope returned by /commands."""
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self._command_response = dict(response)
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def set_graph(self, graph: dict[str, Any]) -> None:
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"""Store the graph returned by GET /assistants/{assistant_id}/graph."""
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self.graph_response = dict(graph)
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def set_state(
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self,
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values: dict[str, Any],
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next: list[Any] | None = None,
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metadata: dict[str, Any] | None = None,
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) -> None:
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"""Store a `ThreadState`-shaped dict for GET /threads/{thread_id}/state."""
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self.state = {
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"values": values,
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"next": next if next is not None else [],
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"tasks": [],
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"metadata": metadata if metadata is not None else {},
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"checkpoint": None,
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"created_at": None,
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}
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@property
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def app(self) -> Starlette:
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if self._app is None:
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self._app = self._build_app()
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return self._app
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def _build_app(self) -> Starlette:
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async def commands(request: Request) -> Response:
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body = orjson.loads(await request.body())
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self.received_commands.append(body)
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self.command_request_headers.append(dict(request.headers))
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command_id = body.get("id")
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if self._command_response is not None:
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response = dict(self._command_response)
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response["id"] = command_id
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return JSONResponse(response)
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return JSONResponse(
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{
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"type": "success",
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"id": command_id,
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"result": {"run_id": "run-1"},
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}
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)
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async def stream_events(request: Request) -> Response:
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self.stream_request_bodies.append(orjson.loads(await request.body()))
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self.stream_request_headers_list.append(dict(request.headers))
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return StreamingResponse(
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self._sse_body(),
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media_type="text/event-stream",
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)
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async def thread_state(request: Request) -> Response:
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self.state_request_count += 1
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self.state_request_headers.append(dict(request.headers))
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return JSONResponse(self.state)
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async def assistant_graph(request: Request) -> Response:
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self.graph_request_params.append(dict(request.query_params))
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self.graph_request_headers.append(dict(request.headers))
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return JSONResponse(self.graph_response)
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return Starlette(
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routes=[
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Route("/threads/{thread_id}/commands", commands, methods=["POST"]),
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Route(
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"/threads/{thread_id}/stream/events",
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stream_events,
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methods=["POST"],
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),
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Route(
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"/threads/{thread_id}/state",
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thread_state,
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methods=["GET"],
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),
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Route(
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"/assistants/{assistant_id}/graph",
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assistant_graph,
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methods=["GET"],
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),
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]
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)
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async def _sse_body(self) -> AsyncIterator[bytes]:
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self.open_event_streams += 1
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self._open_event_streams_max = max(
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self._open_event_streams_max, self.open_event_streams
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)
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script = (
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self._stream_scripts.pop(0)
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if self._stream_scripts
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else _StreamScript(
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events=list(self.scripted_events), delay=self._stream_delay
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)
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)
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try:
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for index, event in enumerate(script.events, start=1):
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if script.delay:
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await asyncio.sleep(script.delay)
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payload = orjson.dumps(event).decode()
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yield f"id: {event.get('event_id', '')}\n".encode()
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yield f"event: message\ndata: {payload}\n\n".encode()
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if script.fail_after is not None and index >= script.fail_after:
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raise RuntimeError("scripted async stream failure")
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finally:
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self.open_event_streams -= 1
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@property
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def peak_open_event_streams(self) -> int:
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return self._open_event_streams_max
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async def _handle_request(self, request: httpx.Request) -> httpx.Response:
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"""Async handler for `httpx.MockTransport` — supports proper streaming failures."""
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path = request.url.path
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if path.endswith("/commands"):
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body = orjson.loads(request.content)
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self.received_commands.append(body)
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self.command_request_headers.append(dict(request.headers))
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command_id = body.get("id")
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if self._command_response is not None:
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response = dict(self._command_response)
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response["id"] = command_id
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return httpx.Response(200, json=response)
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return httpx.Response(
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200,
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json={
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"type": "success",
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"id": command_id,
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"result": {"run_id": "run-1"},
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},
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)
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if path.endswith("/stream/events"):
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self.stream_request_bodies.append(orjson.loads(request.content))
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self.stream_request_headers_list.append(dict(request.headers))
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script = (
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self._stream_scripts.pop(0)
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if self._stream_scripts
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else _StreamScript(
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events=list(self.scripted_events), delay=self._stream_delay
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)
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)
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self.open_event_streams += 1
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self._open_event_streams_max = max(
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self._open_event_streams_max, self.open_event_streams
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)
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# Wrap the stream to decrement open_event_streams on exhaustion.
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stream = _CountedAsyncSseByteStream(script, self)
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return httpx.Response(
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200,
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headers={"content-type": "text/event-stream"},
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stream=stream,
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)
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if path.endswith("/state"):
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self.state_request_count += 1
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self.state_request_headers.append(dict(request.headers))
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return httpx.Response(200, json=self.state)
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return httpx.Response(404, json={"error": f"unexpected path: {path}"})
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