litellm/tests/integration/_support/upstream.py

from __future__ import annotations

import argparse
import asyncio
import base64
import json
import os
import struct
import uuid
import zlib
from collections import deque
from collections.abc import AsyncIterator, Callable, Iterator, Mapping
from dataclasses import dataclass, field
from queue import SimpleQueue
from types import MappingProxyType
from typing import Final, cast

import httpx
import uvicorn
from _fake_openai_endpoint_server import (
    chat_completions,
    completions,
    embeddings,
    health,
    moderations,
    triton_embeddings,
)
from integration.cost_calculation.cost_map import COST_MAP_ENTRIES, FALLBACK_GENERALIZATIONS
from integration.cost_calculation.cost_tracking_case import (
    BinaryResponse,
    EventStreamEvent,
    EventStreamResponse,
    JsonResponse,
    RealtimeResponse,
    RoutedResponse,
    SseResponse,
    StoredResponse,
    TextResponse,
)
from pydantic import BaseModel, ConfigDict, JsonValue, TypeAdapter, ValidationError
from starlette.applications import Starlette
from starlette.datastructures import UploadFile as StarletteUploadFile
from starlette.requests import Request
from starlette.responses import JSONResponse, Response, StreamingResponse
from starlette.routing import Route, WebSocketRoute
from starlette.websockets import WebSocket, WebSocketDisconnect, WebSocketState

JSON_OBJECT: Final = TypeAdapter(dict[str, JsonValue])
INTERNAL_FIELDS: Final = frozenset(
    {
        "litellm_params",
        "litellm_logging_obj",
        "litellm_call_id",
        "litellm_metadata",
        "proxy_server_request",
        "rpm",
        "tpm",
        "timeout",
        "stream_chunk_size",
    }
)


def error_type(status: int) -> str:
    if status == 429:
        return "rate_limit_error"
    return "invalid_request_error" if status < 500 else "server_error"


def _form_observation_value(value: str | StarletteUploadFile) -> JsonValue:
    if isinstance(value, StarletteUploadFile):
        return {"filename": value.filename, "content_type": value.content_type}
    return value


@dataclass(frozen=True, slots=True)
class Observation:
    path: str
    authorization: str
    body: dict[str, JsonValue]
    method: str = "POST"
    api_key: str = ""


@dataclass(frozen=True, slots=True)
class _RealtimeConnection:
    websocket: WebSocket
    response: RealtimeResponse
    session: dict[str, JsonValue]
    scenario_id: str
    authorization: str
    api_key: str
    events: Iterator[dict[str, JsonValue]]
    typed_turn_detection: deque[JsonValue]

    def auto_answers(self) -> bool:
        return (
            self.response.dialect == "xai"
            and len(self.typed_turn_detection) > 0
            and _is_typed_server_vad(self.typed_turn_detection[-1])
        )


class InteractionState(BaseModel):
    """What the scripted Interactions API answers for one interaction id until a DELETE drops it."""

    model_config = ConfigDict(extra="forbid")

    status: str
    usage: dict[str, JsonValue] | None = None
    get_status: int = 200
    delay_seconds: float = 0


class _ReceivedFrame(BaseModel):
    model_config = ConfigDict(frozen=True)
    type: str
    text: str | None = None


class _ScenarioRegistration(BaseModel):
    scenario_id: str
    response: StoredResponse


def _aws_str_header(name: str, value: str) -> bytes:
    name_bytes: Final = name.encode()
    value_bytes: Final = value.encode()
    return (
        struct.pack("!B", len(name_bytes))
        + name_bytes
        + struct.pack("!B", 7)
        + struct.pack("!H", len(value_bytes))
        + value_bytes
    )


def _aws_int_header(name: str, value: int) -> bytes:
    name_bytes: Final = name.encode()
    return struct.pack("!B", len(name_bytes)) + name_bytes + struct.pack("!B", 4) + struct.pack("!i", value)


def aws_event_stream_frame(headers: Mapping[str, str | int], payload: bytes) -> bytes:
    """One AWS event-stream frame: a string header is wire type 7, an int header wire type 4 (int32)."""
    headers_bytes: Final = b"".join(
        _aws_str_header(name, value) if isinstance(value, str) else _aws_int_header(name, value)
        for name, value in headers.items()
    )
    total_length: Final = 12 + len(headers_bytes) + len(payload) + 4
    prelude: Final = struct.pack("!II", total_length, len(headers_bytes))
    prelude_crc: Final = struct.pack("!I", zlib.crc32(prelude) & 0xFFFFFFFF)
    message: Final = prelude + prelude_crc + headers_bytes + payload
    return message + struct.pack("!I", zlib.crc32(message) & 0xFFFFFFFF)


def _aws_event_frame(
    event_type: str,
    payload: Mapping[str, JsonValue],
    scenario_id: str,
    unique_id: str,
) -> bytes:
    payload_bytes: Final = (
        json.dumps(payload, separators=(",", ":"))
        .replace("$REQUEST_ID", scenario_id)
        .replace("$UNIQUE_ID", unique_id)
        .encode()
    )
    return aws_event_stream_frame(
        {":event-type": event_type, ":content-type": "application/json", ":message-type": "event"}, payload_bytes
    )


class ScenarioStore:
    def __init__(self) -> None:
        self._scenarios: dict[str, StoredResponse] = {}

    def put(self, scenario_id: str, response: StoredResponse) -> None:
        self._scenarios[scenario_id] = response

    def drop(self, scenario_id: str) -> bool:
        return self._scenarios.pop(scenario_id, None) is not None

    def get(self, scenario_id: str) -> StoredResponse | None:
        return self._scenarios.get(scenario_id)


@dataclass(frozen=True, slots=True)
class Provider:
    observations: SimpleQueue[Observation] = field(default_factory=SimpleQueue)
    scripts: dict[str, deque[int]] = field(default_factory=dict)
    scenario_store: ScenarioStore = field(default_factory=ScenarioStore)
    interactions: dict[str, InteractionState] = field(default_factory=dict)

    async def chat(self, request: Request) -> Response:
        body: Final = JSON_OBJECT.validate_json(await request.body())
        self.observations.put(
            Observation(request.url.path, request.headers.get("authorization", ""), body, request.method)
        )
        leaked: Final = tuple(sorted(INTERNAL_FIELDS.intersection(body)))
        if leaked:
            return JSONResponse({"error": {"message": f"Unexpected provider fields: {leaked}"}}, status_code=400)
        messages: Final = body.get("messages")
        if not isinstance(body.get("model"), str) or not isinstance(messages, list) or not messages:
            return JSONResponse({"error": {"message": "model and nonempty messages are required"}}, status_code=400)
        if any(
            not isinstance(message, dict)
            or message.get("role") not in {"system", "developer", "user", "assistant", "tool"}
            or "content" not in message
            for message in messages
        ):
            return JSONResponse({"error": {"message": "Invalid selected message contract"}}, status_code=400)
        script: Final = self.scripts.get(str(body["model"]))
        if script is not None:
            if not script:
                return JSONResponse({"error": {"message": "Script exhausted", "type": "api_error"}}, status_code=500)
            status: Final = script.popleft()
            if status != 200:
                return JSONResponse(
                    {
                        "error": {
                            "message": "Controlled provider failure",
                            "type": error_type(status),
                            "code": str(status),
                        }
                    },
                    status_code=status,
                )
        return await chat_completions(request)

    async def vector_store_search(self, request: Request) -> Response:
        body: Final = JSON_OBJECT.validate_json(await request.body())
        self.observations.put(
            Observation(request.url.path, request.headers.get("authorization", ""), body, request.method)
        )
        query: Final = body.get("query")
        if not isinstance(query, str) or not query:
            return JSONResponse({"error": {"message": "query is required"}}, status_code=400)
        vector_store_id: Final = cast(str, request.path_params["vector_store_id"])
        return JSONResponse(
            {
                "object": "vector_store.search_results.page",
                "search_query": query,
                "data": [
                    {
                        "file_id": f"file_{vector_store_id}",
                        "filename": "scripted.txt",
                        "score": 0.9,
                        "attributes": {},
                        "content": [{"type": "text", "text": f"scripted context for {query}"}],
                    }
                ],
                "has_more": False,
                "next_page": None,
            }
        )

    async def script(self, request: Request) -> Response:
        name: Final = cast(str, request.path_params["model"])
        if request.method in {"DELETE", "GET"} and name not in self.scripts:
            return JSONResponse({"error": "Script not found"}, status_code=404)
        if request.method == "GET":
            return JSONResponse({"remaining": list(self.scripts[name])})
        if request.method == "DELETE":
            remaining: Final = self.scripts.pop(name)
            return JSONResponse({"remaining": list(remaining)})
        body: Final = JSON_OBJECT.validate_json(await request.body())
        statuses: Final = body.get("statuses")
        if not isinstance(statuses, list) or not statuses or any(type(value) is not int for value in statuses):
            return JSONResponse({"error": "A nonempty list of HTTP status codes is required"}, status_code=400)
        self.scripts[name] = deque(int(str(value)) for value in statuses)
        return JSONResponse({"configured": len(statuses)})

    async def observed(self, request: Request) -> Response:
        values: Final = tuple(self.observations.get() for _ in range(self.observations.qsize()))
        return JSONResponse(
            {
                "requests": [
                    {
                        "path": value.path,
                        "authorization": value.authorization,
                        "body": value.body,
                        "method": value.method,
                        "api_key": value.api_key,
                    }
                    for value in values
                ]
            }
        )

    async def register_scenario(self, request: Request) -> Response:
        try:
            registration: Final = _ScenarioRegistration.model_validate_json(await request.body())
        except ValidationError as exc:
            return JSONResponse({"error": str(exc)}, status_code=400)
        self.scenario_store.put(registration.scenario_id, registration.response)
        return JSONResponse({"scenario_id": registration.scenario_id})

    async def delete_scenario(self, request: Request) -> Response:
        scenario_id: Final = cast(str, request.path_params["scenario_id"])
        deleted: Final = self.scenario_store.drop(scenario_id)
        return JSONResponse({"deleted": deleted}, status_code=200 if deleted else 404)

    async def cost_map(self, _request: Request) -> Response:
        return JSONResponse({**COST_MAP_ENTRIES, "fallback_generalizations": FALLBACK_GENERALIZATIONS})

    async def oauth_token(self, _request: Request) -> Response:
        return JSONResponse(
            {
                "access_token": "scripted-token",
                "token_type": "Bearer",
                "expires_in": 3600,
            }
        )

    async def scripted(self, request: Request) -> Response:
        segments: Final = tuple(segment for segment in cast(str, request.path_params["path"]).split("/") if segment)
        scenario_id: Final = (
            segments[0].split(":", 1)[0]
            if segments and self.scenario_store.get(segments[0].split(":", 1)[0]) is not None
            else request.headers.get("x-scripted-scenario", "")
        )
        response: Final = self.scenario_store.get(scenario_id)
        if response is None:
            return JSONResponse({"error": "Unknown scenario"}, status_code=404)
        content_type: Final = request.headers.get("content-type", "")
        if request.method == "POST" and "json" in content_type:
            raw_body: Final = await request.body()
            if raw_body:
                body: Final = JSON_OBJECT.validate_json(raw_body)
                if isinstance(body, dict):
                    self.observations.put(
                        Observation(
                            request.url.path,
                            request.headers.get("authorization", ""),
                            body,
                            request.method,
                            request.headers.get("x-goog-api-key", ""),
                        )
                    )
        elif request.method == "POST" and "multipart/form-data" in content_type:
            fields: Final = await request.form()
            body: Final = {name: _form_observation_value(value) for name, value in fields.items()}
            self.observations.put(
                Observation(request.url.path, request.headers.get("authorization", ""), body, request.method)
            )
        elif request.method in {"DELETE", "GET"}:
            self.observations.put(
                Observation(request.url.path, request.headers.get("authorization", ""), {}, request.method)
            )
        if isinstance(response, RoutedResponse):
            route_key: Final = f"{request.method} /{'/'.join(segments[1:])}"
            route: Final = next(
                (
                    candidate
                    for key, candidate in response.routes.items()
                    if key.replace("$REQUEST_ID", scenario_id) == route_key
                ),
                None,
            )
            if route is None:
                return JSONResponse({"error": "Unknown scripted route"}, status_code=404)
            return self._response(route, scenario_id)
        return self._response(response, scenario_id)

    async def interaction_state(self, request: Request) -> Response:
        interaction_id: Final = cast(str, request.path_params["interaction_id"])
        if request.method == "DELETE":
            self.interactions.pop(interaction_id, None)
            return JSONResponse({"interaction_id": interaction_id, "registered": False})
        try:
            state: Final = InteractionState.model_validate_json(await request.body())
        except ValidationError as exc:
            return JSONResponse({"error": str(exc)}, status_code=400)
        self.interactions[interaction_id] = state
        return JSONResponse({"interaction_id": interaction_id, "registered": True})

    def _observe_interaction(self, request: Request) -> None:
        self.observations.put(
            Observation(
                request.url.path,
                request.headers.get("authorization", ""),
                {},
                method=request.method,
                api_key=request.headers.get("x-goog-api-key", ""),
            )
        )

    async def interaction(self, request: Request) -> Response:
        self._observe_interaction(request)
        interaction_id: Final = cast(str, request.path_params["interaction_id"])
        state: Final = self.interactions.get(interaction_id)
        if state is None:
            return JSONResponse(_interaction_not_found(interaction_id), status_code=404)
        if state.delay_seconds:
            await asyncio.sleep(state.delay_seconds)
        if request.method == "DELETE":
            if self.interactions.pop(interaction_id, None) is None:
                return JSONResponse(_interaction_not_found(interaction_id), status_code=404)
            return JSONResponse({})
        if state.get_status != 200:
            return JSONResponse(
                {"error": {"code": state.get_status, "message": "Scripted interaction fetch failure"}},
                status_code=state.get_status,
            )
        return JSONResponse(_interaction_body(interaction_id, state))

    async def cancel_interaction(self, request: Request) -> Response:
        self._observe_interaction(request)
        interaction_id: Final = cast(str, request.path_params["interaction_id"])
        state: Final = self.interactions.get(interaction_id)
        if state is None:
            return JSONResponse(_interaction_not_found(interaction_id), status_code=404)
        cancelled: Final = InteractionState(status="cancelled", usage=state.usage, get_status=state.get_status)
        self.interactions[interaction_id] = cancelled
        return JSONResponse(_interaction_body(interaction_id, cancelled))

    async def realtime(self, websocket: WebSocket) -> None:
        authorization: Final = websocket.headers.get("authorization", "")
        api_key: Final = websocket.headers.get("api-key", "")
        scenario_id: Final = authorization.removeprefix("Bearer ") if authorization else api_key
        self.observations.put(
            Observation(
                websocket.url.path,
                authorization,
                {"query": [[key, value] for key, value in websocket.query_params.multi_items()]},
                "WEBSOCKET",
                api_key,
            )
        )
        response: Final = self.scenario_store.get(scenario_id)
        if not isinstance(response, RealtimeResponse):
            await websocket.close(code=4404)
            return
        try:
            await self._realtime_frames(websocket, response, scenario_id, authorization, api_key)
        except WebSocketDisconnect:
            return

    async def _realtime_frames(
        self, websocket: WebSocket, response: RealtimeResponse, scenario_id: str, authorization: str, api_key: str
    ) -> None:
        await websocket.accept()
        session: Final = _realtime_session(response, scenario_id, websocket.query_params.get("model", ""))
        frames: Final = _received_texts(websocket)
        held: Final = await anext(frames, None) if response.created_after_first_frame else None
        for _ in range(response.created_repeats):
            await websocket.send_json({"type": response.created_event, "event_id": _event_id(), "session": session})
        connection: Final = _RealtimeConnection(
            websocket, response, session, scenario_id, authorization, api_key, iter(response.events), deque(maxlen=1)
        )
        if held is not None:
            await self._realtime_frame(connection, held)
        async for message in frames:
            await self._realtime_frame(connection, message)

    async def _realtime_frame(self, connection: _RealtimeConnection, message: str) -> None:
        websocket: Final = connection.websocket
        response: Final = connection.response
        payload: Final = JSON_OBJECT.validate_json(message)
        self.observations.put(
            Observation(websocket.url.path, connection.authorization, payload, "WEBSOCKET_FRAME", connection.api_key)
        )
        frame_type: Final = payload.get("type")
        if frame_type == "session.update":
            reply: Final = _realtime_update_reply(
                payload.get("session"), connection.session, response.session_type, response.dialect
            )
            if reply["type"] == "session.updated":
                connection.typed_turn_detection.extend(
                    filter(_declares_a_type, _declared_turn_detection(payload.get("session")))
                )
            await _reply_while_open(websocket, reply)
            return
        if frame_type == "response.cancel":
            await _reply_while_open(websocket, _cancel_not_active(payload.get("event_id"), response.dialect))
            return
        if frame_type not in _REALTIME_TRIGGERS:
            return
        event: Final = next(connection.events, None)
        if event is None:
            return
        await _reply_while_open(websocket, _rendered_realtime_event(event, connection.scenario_id))
        if frame_type == "input_audio_buffer.commit" and connection.auto_answers():
            await _reply_while_open(websocket, _rendered_realtime_event(dict(_AUTO_ANSWER), connection.scenario_id))

    async def muse_realtime(self, websocket: WebSocket) -> None:
        await websocket.accept()
        handshake: Final = JSON_OBJECT.validate_python(await websocket.receive_json())
        authorization: Final = _muse_access_token(handshake)
        self.observations.put(Observation(websocket.url.path, authorization, handshake, "WEBSOCKET"))
        scenario_id: Final = authorization.removeprefix("Bearer ")
        response: Final = self.scenario_store.get(scenario_id)
        if not isinstance(response, RealtimeResponse):
            await websocket.close(code=4404)
            return
        await websocket.send_json({"sessionId": f"sess_{scenario_id}"})
        pending: Final = deque(response.events)
        while True:
            frame: Final = await websocket.receive()
            if frame["type"] == "websocket.disconnect":
                return
            self.observations.put(Observation(websocket.url.path, authorization, _muse_frame(frame), "WEBSOCKET_FRAME"))
            while pending:
                await websocket.send_json(_rendered_realtime_event(pending.popleft(), scenario_id))

    async def gemini_live(self, websocket: WebSocket) -> None:
        await self._gemini_live_session(
            websocket,
            websocket.headers.get("x-goog-user-project", ""),
            websocket.headers.get("authorization", ""),
            _accepts_every_setup,
        )

    async def gemini_ai_studio_live(self, websocket: WebSocket) -> None:
        await self._gemini_live_session(websocket, websocket.query_params.get("key", ""), "", _ai_studio_setup_refusal)

    async def _gemini_live_session(
        self,
        websocket: WebSocket,
        scenario_id: str,
        authorization: str,
        setup_refusal: Callable[[Mapping[str, JsonValue]], str | None],
    ) -> None:
        self.observations.put(
            Observation(
                websocket.url.path,
                authorization,
                {"host": websocket.headers.get("host", "")},
                "WEBSOCKET",
                scenario_id,
            )
        )
        response: Final = self.scenario_store.get(scenario_id)
        if not isinstance(response, RealtimeResponse):
            await websocket.close(code=4404)
            return
        await websocket.accept()
        pending: Final = deque(response.events)
        async for message in websocket.iter_json():
            payload: Final = JSON_OBJECT.validate_python(message)
            self.observations.put(
                Observation(websocket.url.path, authorization, payload, "WEBSOCKET_FRAME", scenario_id)
            )
            if "setup" in payload:
                if (refusal := setup_refusal(payload)) is not None:
                    await websocket.close(code=_INVALID_ARGUMENT_CLOSE, reason=refusal[:_CLOSE_REASON_BYTES])
                    return
                await websocket.send_json({"setupComplete": {}})
                continue
            if not _GEMINI_LIVE_TRIGGERS.intersection(payload):
                continue
            while pending:
                await websocket.send_json(_rendered_realtime_event(pending.popleft(), scenario_id))

    @staticmethod
    def _response(response: StoredResponse, scenario_id: str) -> Response:
        unique_id: Final = f"{scenario_id}-{uuid.uuid4().hex[:8]}"
        match response:
            case JsonResponse():
                return Response(
                    content=json.dumps(response.body, separators=(",", ":"))
                    .replace("$REQUEST_ID", scenario_id)
                    .replace("$UNIQUE_ID", unique_id)
                    .encode(),
                    media_type=response.content_type,
                    status_code=response.status,
                    headers=response.headers,
                )
            case BinaryResponse():
                return Response(
                    content=b"\x00" * response.length,
                    media_type=response.content_type,
                )
            case TextResponse():
                return Response(
                    content=response.body.replace("$REQUEST_ID", scenario_id).encode(),
                    media_type=response.content_type,
                    status_code=response.status,
                )
            case SseResponse():
                if response.frame_delay_ms > 0:

                    async def stream() -> AsyncIterator[bytes]:
                        for frame in response.frames:
                            yield (
                                f"{frame.replace('$REQUEST_ID', scenario_id).replace('$UNIQUE_ID', unique_id)}\n\n"
                            ).encode()
                            await asyncio.sleep(response.frame_delay_ms / 1000)

                    return StreamingResponse(stream(), media_type=response.content_type, headers=response.headers)
                stream_body: Final = (
                    ("\n\n".join(response.frames) + "\n\n")
                    .replace("$REQUEST_ID", scenario_id)
                    .replace("$UNIQUE_ID", unique_id)
                )
                return Response(content=stream_body.encode(), media_type=response.content_type, headers=response.headers)
            case EventStreamResponse():
                events: Final = (
                    tuple(
                        EventStreamEvent(
                            event_type="chunk",
                            payload={
                                "bytes": base64.b64encode(
                                    json.dumps(event.payload, separators=(",", ":"))
                                    .replace("$REQUEST_ID", scenario_id)
                                    .replace("$UNIQUE_ID", unique_id)
                                    .encode()
                                ).decode(),
                            },
                        )
                        for event in response.events
                    )
                    if response.framing == "invoke"
                    else response.events
                )
                event_body: Final = b"".join(
                    _aws_event_frame(event.event_type, event.payload, scenario_id, unique_id) for event in events
                )
                return Response(content=event_body, media_type=response.content_type)

    def app(self) -> Starlette:
        return Starlette(
            routes=[
                Route("/health", health),
                Route("/__observations", self.observed),
                Route("/__scripts/{model}", self.script, methods=["POST", "DELETE", "GET"]),
                Route("/__scenarios", self.register_scenario, methods=["POST"]),
                Route("/__scenarios/{scenario_id}", self.delete_scenario, methods=["DELETE"]),
                Route("/_cost_map", self.cost_map, methods=["GET"]),
                Route("/_oauth/token", self.oauth_token, methods=["POST"]),
                Route("/v1/chat/completions", self.chat, methods=["POST"]),
                Route("/v1/completions", completions, methods=["POST"]),
                Route("/v1/embeddings", embeddings, methods=["POST"]),
                Route("/v1/moderations", moderations, methods=["POST"]),
                Route("/triton/embeddings", triton_embeddings, methods=["POST"]),
                Route("/vector_stores/{vector_store_id}/search", self.vector_store_search, methods=["POST"]),
                Route("/__interactions/{interaction_id}", self.interaction_state, methods=["PUT", "DELETE"]),
                Route("/v1beta/interactions/{interaction_id}/cancel", self.cancel_interaction, methods=["POST"]),
                Route("/v1beta/interactions/{interaction_id}", self.interaction, methods=["GET", "DELETE"]),
                Route(
                    "/{prefix:path}/v1beta/interactions/{interaction_id}/cancel",
                    self.cancel_interaction,
                    methods=["POST"],
                ),
                Route(
                    "/{prefix:path}/v1beta/interactions/{interaction_id}",
                    self.interaction,
                    methods=["GET", "DELETE"],
                ),
                Route("/{path:path}", self.scripted, methods=["POST"]),
                Route("/{path:path}", self.scripted, methods=["GET"]),
                Route("/{path:path}", self.scripted, methods=["DELETE"]),
                WebSocketRoute("/v1/realtime", self.realtime),
                WebSocketRoute("/openai/v1/realtime", self.realtime),
                WebSocketRoute("/openai/realtime", self.realtime),
                WebSocketRoute("/v1/asr/realtime", self.muse_realtime),
                WebSocketRoute(GEMINI_LIVE_PATH, self.gemini_live),
                WebSocketRoute(GEMINI_AI_STUDIO_LIVE_PATH, self.gemini_ai_studio_live),
            ]
        )


CONTROL_URL: Final = os.environ.get("INTEGRATION_UPSTREAM_URL", "http://127.0.0.1:8190").rstrip("/")


def _interaction_not_found(interaction_id: str) -> dict[str, JsonValue]:
    return {"error": {"code": 404, "message": f"Interaction {interaction_id} not found", "status": "NOT_FOUND"}}


def _interaction_body(interaction_id: str, state: InteractionState) -> dict[str, JsonValue]:
    return {
        "id": interaction_id,
        "object": "interaction",
        "model": "gemini-3.8-flash",
        "status": state.status,
        "steps": [],
        "usage": state.usage,
    }


_REALTIME_TRIGGERS: Final = frozenset({"response.create", "input_audio_buffer.commit"})
_GEMINI_LIVE_TRIGGERS: Final = frozenset({"clientContent", "realtimeInput"})
GEMINI_LIVE_PATH: Final = "/ws/google.cloud.aiplatform.v1.LlmBidiService/BidiGenerateContent"
GEMINI_AI_STUDIO_LIVE_PATH: Final = "/ws/google.ai.generativelanguage.v1beta.GenerativeService.BidiGenerateContent"
_INVALID_ARGUMENT_CLOSE: Final = 1007
_CLOSE_REASON_BYTES: Final = 123
_AI_STUDIO_TUNING_FIELDS: Final = MappingProxyType(
    {"prefixPaddingMs": "prefix_padding_ms", "silenceDurationMs": "silence_duration_ms"}
)
_AUTO_ANSWER: Final[Mapping[str, JsonValue]] = MappingProxyType(
    {
        "type": "response.done",
        "event_id": "evt_$UNIQUE_ID",
        "response": {"id": "resp_auto_$UNIQUE_ID", "object": "realtime.response", "status": "completed", "output": []},
    }
)
_TRANSCRIPTION_UPDATE_REFUSED: Final = "Passing a realtime session update to a transcription session is not allowed."
_REALTIME_UPDATE_REFUSED: Final = "Passing a transcription session update to a realtime session is not allowed."
_NESTED_TURN_DETECTION_TYPE: Final = "session.audio.input.turn_detection.type"
_FLAT_TURN_DETECTION_TYPE: Final = "session.turn_detection.type"


def _event_id() -> str:
    return f"event_{uuid.uuid4().hex[:12]}"


def _realtime_session(response: RealtimeResponse, scenario_id: str, requested_model: str) -> dict[str, JsonValue]:
    return {
        "id": f"sess_{scenario_id}",
        "model": response.session_model if response.session_model is not None else requested_model,
        **({} if response.session_type is None else {"type": response.session_type}),
    }


def _realtime_error(code: str, message: str, param: str | None) -> dict[str, JsonValue]:
    return {
        "type": "error",
        "event_id": _event_id(),
        "error": {"type": "invalid_request_error", "code": code, "message": message, "param": param, "event_id": None},
    }


def _missing_turn_detection_type(session: Mapping[str, JsonValue]) -> str | None:
    audio: Final = session.get("audio")
    audio_input: Final = audio.get("input") if isinstance(audio, dict) else None
    nested: Final = audio_input.get("turn_detection") if isinstance(audio_input, dict) else None
    if isinstance(nested, dict) and "type" not in nested:
        return _NESTED_TURN_DETECTION_TYPE
    flat: Final = session.get("turn_detection")
    if isinstance(flat, dict) and "type" not in flat:
        return _FLAT_TURN_DETECTION_TYPE
    return None


def _realtime_update_reply(
    session: JsonValue, created: Mapping[str, JsonValue], session_type: str | None, dialect: str
) -> dict[str, JsonValue]:
    if not isinstance(session, dict):
        return _realtime_error("invalid_value", "Invalid value for 'session': expected an object.", "session")
    missing: Final = None if dialect == "xai" else _missing_turn_detection_type(session)
    if missing is not None:
        return _realtime_error("missing_required_parameter", f"Missing required parameter: '{missing}'.", missing)
    declared: Final = session.get("type")
    if session_type == "transcription" and declared is not None and declared != "transcription":
        return _realtime_error("invalid_parameter", _TRANSCRIPTION_UPDATE_REFUSED, "")
    if session_type != "transcription" and declared == "transcription":
        return _realtime_error("invalid_parameter", _REALTIME_UPDATE_REFUSED, "")
    return {"type": "session.updated", "event_id": _event_id(), "session": {**created, **session}}


async def _received_texts(websocket: WebSocket) -> AsyncIterator[str]:
    while (frame := _ReceivedFrame.model_validate(await websocket.receive())).type == "websocket.receive":
        if frame.text is not None:
            yield frame.text


async def _reply_while_open(websocket: WebSocket, frame: Mapping[str, JsonValue]) -> None:
    if websocket.application_state is not WebSocketState.CONNECTED:
        return
    try:
        await websocket.send_json(frame)
    except WebSocketDisconnect:
        return


def _cancel_not_active(cancel_event_id: JsonValue, dialect: str) -> dict[str, JsonValue]:
    message: Final = "Cancellation failed: no active response found"
    if dialect == "xai":
        own_id: Final = _event_id()
        return {
            "type": "error",
            "event_id": own_id,
            "error": {
                "message": message,
                "type": "invalid_request_error",
                "code": "invalid_request_error",
                "event_id": own_id,
            },
        }
    return {
        "type": "error",
        "event_id": _event_id(),
        "error": {
            "type": "invalid_request_error",
            "code": "response_cancel_not_active",
            "message": message,
            "param": None,
            "event_id": cancel_event_id,
        },
    }


def _declared_turn_detection(session: JsonValue) -> tuple[JsonValue, ...]:
    if not isinstance(session, dict):
        return ()
    audio: Final = session.get("audio")
    audio_input: Final = audio.get("input") if isinstance(audio, dict) else None
    if isinstance(audio_input, dict) and "turn_detection" in audio_input:
        return (audio_input["turn_detection"],)
    return (session["turn_detection"],) if "turn_detection" in session else ()


def _declares_a_type(turn_detection: JsonValue) -> bool:
    return isinstance(turn_detection, dict) and "type" in turn_detection


def _is_typed_server_vad(turn_detection: JsonValue) -> bool:
    return isinstance(turn_detection, dict) and turn_detection.get("type") == "server_vad"


def _accepts_every_setup(_payload: Mapping[str, JsonValue]) -> str | None:
    return None


def _ai_studio_setup_refusal(payload: Mapping[str, JsonValue]) -> str | None:
    setup: Final = payload.get("setup")
    config: Final = setup.get("realtimeInputConfig") if isinstance(setup, dict) else None
    detection: Final = config.get("automaticActivityDetection") if isinstance(config, dict) else None
    if not isinstance(detection, dict) or detection.get("disabled") is not True:
        return None
    tuning: Final = tuple(name for key, name in _AI_STUDIO_TUNING_FIELDS.items() if key in detection)
    if not tuning:
        return None
    return f"automatic_activity_detection.disabled is true, but the following fields were also set: {', '.join(tuning)}"


def _rendered_realtime_event(event: Mapping[str, JsonValue], scenario_id: str) -> dict[str, JsonValue]:
    return JSON_OBJECT.validate_json(
        json.dumps(event, separators=(",", ":"))
        .replace("$REQUEST_ID", scenario_id)
        .replace("$UNIQUE_ID", f"{scenario_id}-{uuid.uuid4().hex[:8]}")
    )


def _muse_access_token(handshake: Mapping[str, JsonValue]) -> str:
    authorization: Final = handshake.get("authorization")
    token: Final = authorization.get("accessToken") if isinstance(authorization, dict) else None
    return token if isinstance(token, str) else ""


def _muse_frame(frame: Mapping[str, object]) -> dict[str, JsonValue]:
    text: Final = frame.get("text")
    if isinstance(text, str):
        return JSON_OBJECT.validate_json(text)
    data: Final = frame.get("bytes")
    return {"binary_bytes": len(data) if isinstance(data, bytes) else 0}


@dataclass(frozen=True, slots=True)
class ScenarioHandle:
    scenario_id: str
    control_url: str

    def api_base(self) -> str:
        return f"{self.control_url}/{self.scenario_id}"


def register_scenario(scenario_id: str, response: StoredResponse, *, control_url: str = CONTROL_URL) -> ScenarioHandle:
    http_response: Final = httpx.post(
        f"{control_url}/__scenarios",
        json={"scenario_id": scenario_id, "response": response.model_dump(mode="json")},
        trust_env=False,
        timeout=15,
        verify=_verify_control(control_url),
    )
    http_response.raise_for_status()
    return ScenarioHandle(
        scenario_id=scenario_id,
        control_url=control_url,
    )


def delete_scenario(handle: ScenarioHandle) -> None:
    response: Final = httpx.delete(
        f"{handle.control_url}/__scenarios/{handle.scenario_id}",
        trust_env=False,
        timeout=15,
        verify=_verify_control(handle.control_url),
    )
    response.raise_for_status()


def _verify_control(control_url: str) -> bool:
    return not control_url.startswith("https://")


def set_interaction_state(control_url: str, interaction_id: str, state: InteractionState) -> None:
    response: Final = httpx.put(
        f"{control_url}/__interactions/{interaction_id}",
        content=state.model_dump_json(),
        headers={"content-type": "application/json"},
        trust_env=False,
        timeout=15,
    )
    response.raise_for_status()


def clear_interaction_state(control_url: str, interaction_id: str) -> None:
    response: Final = httpx.delete(f"{control_url}/__interactions/{interaction_id}", trust_env=False, timeout=15)
    response.raise_for_status()


def main() -> None:
    parser: Final = argparse.ArgumentParser()
    parser.add_argument("--port", type=int, default=8190)
    parser.add_argument("--ssl-certfile", default=None)
    parser.add_argument("--ssl-keyfile", default=None)
    arguments: Final = parser.parse_args()
    uvicorn.run(
        Provider().app(),
        host="127.0.0.1",
        port=cast(int, arguments.port),
        access_log=False,
        timeout_keep_alive=125,
        timeout_graceful_shutdown=5,
        ssl_certfile=cast(str | None, arguments.ssl_certfile),
        ssl_keyfile=cast(str | None, arguments.ssl_keyfile),
    )


if __name__ == "__main__":
    main()