vf-cuda-grid/controller/cuda_grid_controller/http_api.py

"""HTTP REST API (FastAPI)."""

from __future__ import annotations

import asyncio
from typing import Any

import structlog
from fastapi import Body, FastAPI, HTTPException
from fastapi.responses import Response
from pydantic import BaseModel, TypeAdapter

from .config import Config
from .dispatch import CommandDispatcher
from .layouts import PREDEFINED_LAYOUTS
from .overlays import Overlay
from .state import ControllerState

log = structlog.get_logger()


class LayoutSetReq(BaseModel):
    layout: str


class AudioSetReq(BaseModel):
    source: str


def create_app(
    cfg: Config, state: ControllerState, dispatcher: CommandDispatcher
) -> FastAPI:
    app = FastAPI(
        title="cuda-grid-controller",
        version="0.1.0",
        description="Control plane для vf_cuda_grid FFmpeg filter",
    )

    def _check_instance(name: str):
        inst = next((i for i in cfg.instances if i.name == name), None)
        if inst is None:
            raise HTTPException(404, f"unknown instance '{name}'")
        return inst

    @app.get("/health")
    async def health() -> dict[str, Any]:
        return {"status": "ok"}

    @app.get("/layouts")
    async def layouts() -> dict[str, Any]:
        return {"predefined": PREDEFINED_LAYOUTS}

    @app.get("/state")
    async def get_state() -> dict[str, Any]:
        out = {}
        for inst in cfg.instances:
            overlays = await state.get_overlays(inst.name)
            out[inst.name] = {
                "active_layout": await state.get_layout(inst.name),
                "zmq_endpoint": inst.zmq_endpoint,
                "overlays_count": len(overlays),
            }
        return {"instances": out}

    @app.post("/layout/{instance}/set")
    async def set_layout(instance: str, req: LayoutSetReq) -> dict[str, Any]:
        _check_instance(instance)
        if req.layout not in PREDEFINED_LAYOUTS:
            raise HTTPException(
                400, f"unknown layout '{req.layout}'. Доступны: {PREDEFINED_LAYOUTS}"
            )
        await dispatcher.handle(instance, "layout.set", req.layout)
        return {"ok": True, "instance": instance, "layout": req.layout}

    # ─── Overlays ──────────────────────────────────────────────────

    @app.post("/overlay/{instance}/add")
    async def overlay_add(
        instance: str, overlay: Overlay = Body(...)
    ) -> dict[str, Any]:
        _check_instance(instance)
        await dispatcher.handle(
            instance, "overlay.add", overlay.model_dump_json()
        )
        return {"ok": True, "id": overlay.id, "type": overlay.type}

    @app.get("/overlay/{instance}")
    async def overlay_list(instance: str) -> dict[str, Any]:
        _check_instance(instance)
        overlays = await state.get_overlays(instance)
        return {
            "instance": instance,
            "count": len(overlays),
            "overlays": [o.model_dump() for o in overlays],
        }

    @app.delete("/overlay/{instance}/{overlay_id}")
    async def overlay_remove(instance: str, overlay_id: str) -> dict[str, Any]:
        _check_instance(instance)
        await dispatcher.handle(instance, "overlay.remove", overlay_id)
        return {"ok": True}

    @app.delete("/overlay/{instance}")
    async def overlay_clear(instance: str) -> dict[str, Any]:
        _check_instance(instance)
        await dispatcher.handle(instance, "overlay.clear", "")
        return {"ok": True}

    # ─── Audio ─────────────────────────────────────────────────────

    @app.get("/audio/{instance}")
    async def audio_list(instance: str) -> dict[str, Any]:
        inst = _check_instance(instance)
        return {
            "instance": instance,
            "sources": [
                {"name": s.name, "index": s.index, "label": s.label or s.name}
                for s in inst.audio_sources
            ],
        }

    @app.post("/audio/{instance}/set")
    async def audio_set(instance: str, req: AudioSetReq) -> dict[str, Any]:
        inst = _check_instance(instance)
        names = {s.name for s in inst.audio_sources}
        if req.source not in names:
            raise HTTPException(
                400, f"unknown audio source '{req.source}'. Доступны: {sorted(names)}"
            )
        await dispatcher.handle(instance, "audio.set", req.source)
        return {"ok": True, "instance": instance, "source": req.source}

    @app.post("/intercom/{instance}/start")
    async def intercom_start(instance: str) -> dict[str, Any]:
        _check_instance(instance)
        await dispatcher.handle(instance, "intercom.start", "")
        return {"ok": True, "instance": instance, "intercom": "active"}

    @app.post("/intercom/{instance}/end")
    async def intercom_end(instance: str) -> dict[str, Any]:
        _check_instance(instance)
        await dispatcher.handle(instance, "intercom.end", "")
        return {"ok": True, "instance": instance, "intercom": "idle"}

    # ─── Snapshot ──────────────────────────────────────────────────

    @app.post(
        "/snapshot/{instance}",
        responses={
            200: {"content": {"image/png": {}}, "description": "PNG snapshot of live grid"},
            504: {"description": "ffmpeg timeout"},
        },
    )
    async def snapshot(instance: str) -> Response:
        """Capture single frame от output_rtsp_url. Returns PNG bytes (image/png)."""
        inst = _check_instance(instance)
        if not inst.output_rtsp_url:
            raise HTTPException(400, f"instance '{instance}' has no output_rtsp_url configured")

        proc = await asyncio.create_subprocess_exec(
            "ffmpeg", "-hide_banner", "-loglevel", "error",
            "-rtsp_transport", "tcp",
            "-i", inst.output_rtsp_url,
            "-frames:v", "1",
            "-f", "image2pipe", "-c:v", "png", "-",
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE,
        )
        try:
            png_data, err = await asyncio.wait_for(proc.communicate(), timeout=10)
        except asyncio.TimeoutError:
            proc.kill()
            raise HTTPException(504, "snapshot timeout (ffmpeg >10s)")

        if proc.returncode != 0 or not png_data:
            err_msg = err.decode(errors="replace")[:300] if err else "no output"
            log.warning("snapshot.failed", instance=instance, err=err_msg)
            raise HTTPException(500, f"ffmpeg failed: {err_msg}")

        log.info("snapshot.ok", instance=instance, bytes=len(png_data))
        return Response(content=png_data, media_type="image/png")

    @app.patch("/overlay/{instance}/{overlay_id}")
    async def overlay_update(
        instance: str, overlay_id: str, overlay: Overlay = Body(...)
    ) -> dict[str, Any]:
        _check_instance(instance)
        # Фиксируем id из URL — игнорируем body's id если отличается
        overlay.id = overlay_id
        await state.update_overlay(instance, overlay)
        await dispatcher.handle(
            instance, "overlay.add", overlay.model_dump_json()
        )
        return {"ok": True, "id": overlay_id}

    return app