675 lines
23 KiB
Python
675 lines
23 KiB
Python
import asyncio
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import contextlib
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import mimetypes
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import struct
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import sys
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import threading
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import urllib.parse
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from collections import OrderedDict
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from dataclasses import dataclass
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from multiprocessing import cpu_count
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from pathlib import Path, PurePosixPath
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from time import perf_counter
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from urllib.parse import unquote
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from wsgiref.handlers import format_date_time
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import httpx
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import msgspec
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from blake3 import blake3
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from sanic import Blueprint, empty, raw, redirect
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from sanic.exceptions import NotFound
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from sanic.log import logger
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from cista import auth, config, onlyoffice, sharefs
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from cista.preview_worker import (
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DOC_PREVIEW_SUFFIXES,
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OFFICE_PREVIEW_SUFFIXES,
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PreviewRequest,
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PreviewResponse,
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)
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from cista.util.filename import sanitize
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bp = Blueprint("preview", url_prefix="/preview")
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@dataclass(slots=True)
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class CachedPreview:
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"""Cached preview with headers and body."""
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headers: dict[str, str]
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body: bytes
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class PreviewCache:
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"""Thread-safe LRU cache for preview responses."""
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def __init__(self, capacity: int = 500):
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self.capacity = capacity
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self._cache: OrderedDict[str, CachedPreview] = OrderedDict()
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self._lock = threading.Lock()
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def get(self, key: str) -> CachedPreview | None:
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"""Get cached preview, moving it to end (most recently used)."""
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with self._lock:
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if key in self._cache:
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self._cache.move_to_end(key)
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return self._cache[key]
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return None
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def set(self, key: str, value: CachedPreview) -> None:
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"""Cache preview, evicting oldest if at capacity."""
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with self._lock:
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if key in self._cache:
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self._cache.move_to_end(key)
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else:
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if len(self._cache) >= self.capacity:
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self._cache.popitem(last=False)
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self._cache[key] = value
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def __len__(self) -> int:
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with self._lock:
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return len(self._cache)
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# Global preview cache instance
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_preview_cache = PreviewCache(capacity=500)
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PREVIEW_TIMEOUT = 10.0 # seconds until preview subprocess is killed
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PREVIEW_WORKERS = max(2, min(8, cpu_count()))
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_active_procs: set[asyncio.subprocess.Process] = set()
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_preview_pool = None
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_preview_pool_lock = asyncio.Lock()
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AVIF_FAST_EFFORT = 0
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WORKER_CHECKSUM_BYTES = 32
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WORKER_MAX_JSON_BYTES = 1_000_000
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class WorkerChecksumError(Exception):
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"""Raised when worker response checksum does not match the packet."""
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class WorkerProtocolError(Exception):
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"""Raised when worker response packet is malformed."""
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class _PreviewWorker:
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def __init__(self, proc: asyncio.subprocess.Process):
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self.proc = proc
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async def request(
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self,
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filepath,
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quality: int,
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maxsize: int,
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maxzoom: float,
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data: bytes | None = None,
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):
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if self.proc.returncode is not None:
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raise WorkerProtocolError("worker already exited")
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if self.proc.stdin is None or self.proc.stdout is None:
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raise WorkerProtocolError("worker streams not available")
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meta = msgspec.json.encode(
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PreviewRequest(
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path=str(filepath),
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quality=quality,
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maxsize=maxsize,
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maxzoom=maxzoom,
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)
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)
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payload = data or b""
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packet = struct.pack("<II", len(meta), len(payload)) + meta + payload
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self.proc.stdin.write(packet)
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await self.proc.stdin.drain()
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checksum = await self.proc.stdout.readexactly(WORKER_CHECKSUM_BYTES)
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header = await self.proc.stdout.readexactly(8)
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json_size, data_size = struct.unpack("<II", header)
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if json_size > WORKER_MAX_JSON_BYTES:
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raise WorkerProtocolError(f"worker JSON too large: {json_size}")
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meta_raw = await self.proc.stdout.readexactly(json_size)
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payload = await self.proc.stdout.readexactly(data_size)
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packet = header + meta_raw + payload
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if blake3(packet).digest() != checksum:
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raise WorkerChecksumError("worker checksum mismatch")
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resp = msgspec.json.decode(meta_raw, type=PreviewResponse)
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if not resp.ok:
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raise PreviewError(
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resp.error or "preview worker error",
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stderr=resp.stderr,
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backend=resp.backend,
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)
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return payload or None, resp
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async def kill(self) -> None:
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if self.proc.returncode is None:
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with contextlib.suppress(ProcessLookupError):
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self.proc.kill()
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await self.proc.wait()
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_active_procs.discard(self.proc)
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class _PreviewWorkerPool:
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def __init__(self, size: int):
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self.size = size
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self._idle: asyncio.Queue[_PreviewWorker] = asyncio.Queue()
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self._pending: asyncio.PriorityQueue[tuple[int, int, asyncio.Future, tuple]] = (
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asyncio.PriorityQueue()
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)
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self._workers: set[_PreviewWorker] = set()
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self._dispatchers: list[asyncio.Task] = []
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self._seq = 0
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self._closed = False
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async def _read_startup_stderr(self, proc: asyncio.subprocess.Process) -> str:
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if proc.stderr is None:
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return ""
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with contextlib.suppress(TimeoutError):
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data = await asyncio.wait_for(proc.stderr.read(), timeout=0.5)
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return data.decode(errors="replace").strip()
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return ""
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async def _spawn_worker(self) -> _PreviewWorker:
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proc = await asyncio.create_subprocess_exec(
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sys.executable,
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"-m",
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"cista.preview_worker",
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stdin=asyncio.subprocess.PIPE,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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start_new_session=True,
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)
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_active_procs.add(proc)
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try:
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ready = await asyncio.wait_for(proc.stdout.readexactly(1), timeout=30.0)
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except TimeoutError as err:
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with contextlib.suppress(ProcessLookupError):
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proc.kill()
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with contextlib.suppress(Exception):
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await proc.wait()
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stderr = await self._read_startup_stderr(proc)
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if stderr:
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raise WorkerProtocolError(
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"preview worker failed to become ready: " + stderr.splitlines()[-1]
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) from err
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raise WorkerProtocolError("preview worker failed to become ready") from err
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except asyncio.IncompleteReadError as err:
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stderr = await self._read_startup_stderr(proc)
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if stderr:
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raise WorkerProtocolError(
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"preview worker exited before signalling readiness: "
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+ stderr.splitlines()[-1]
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) from err
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raise WorkerProtocolError(
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"preview worker exited before signalling readiness"
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) from err
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if ready != b"\x01":
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raise WorkerProtocolError(f"preview worker ready signal invalid: {ready!r}")
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return _PreviewWorker(proc)
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async def _add_worker(self) -> None:
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worker = await self._spawn_worker()
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self._workers.add(worker)
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await self._idle.put(worker)
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async def _replace_worker(self, worker: _PreviewWorker) -> None:
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self._workers.discard(worker)
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await worker.kill()
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if self._closed:
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return
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try:
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await self._add_worker()
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except Exception:
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logger.exception("Failed to replace preview worker")
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async def _dispatch_loop(self) -> None:
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while True:
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try:
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_priority, _seq, future, args = await self._pending.get()
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except asyncio.CancelledError:
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return
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if future.cancelled():
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continue
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try:
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worker = await asyncio.wait_for(
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self._idle.get(), timeout=PREVIEW_TIMEOUT
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)
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except TimeoutError:
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logger.warning(
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"Preview worker unavailable (%ds) for %s",
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int(PREVIEW_TIMEOUT),
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args[0].name,
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)
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if not future.done():
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future.set_exception(PreviewTimeoutError(args[0].name))
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continue
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filepath = args[0]
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replace = False
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try:
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out, resp = await asyncio.wait_for(
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worker.request(*args),
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timeout=PREVIEW_TIMEOUT,
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)
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if not future.done():
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future.set_result((out, resp))
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except TimeoutError:
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replace = True
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logger.warning(
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"Preview timeout (%ds) for %s", int(PREVIEW_TIMEOUT), filepath.name
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)
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if not future.done():
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future.set_exception(PreviewTimeoutError(filepath.name))
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except WorkerChecksumError:
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replace = True
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logger.error("Preview checksum mismatch for %s", filepath.name)
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if not future.done():
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future.set_exception(
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PreviewError(f"worker checksum mismatch for {filepath.name}")
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)
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except PreviewError as e:
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if not future.done():
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future.set_exception(e)
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except (
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WorkerProtocolError,
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asyncio.IncompleteReadError,
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BrokenPipeError,
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ConnectionResetError,
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OSError,
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ValueError,
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msgspec.json.DecodeError,
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) as e:
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replace = True
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logger.warning(
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"Preview worker protocol failure for %s: %s", filepath.name, e
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)
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if not future.done():
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future.set_exception(
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PreviewError(
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f"worker protocol failure for {filepath.name}: {e}"
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)
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)
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except Exception:
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replace = True
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logger.exception(
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"Unexpected preview worker error for %s", filepath.name
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)
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if not future.done():
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future.set_exception(
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PreviewError(f"unexpected worker error for {filepath.name}")
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)
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finally:
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if replace:
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await self._replace_worker(worker)
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elif worker.proc.returncode is None:
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await self._idle.put(worker)
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else:
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await self._replace_worker(worker)
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async def start(self) -> None:
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workers = await asyncio.gather(
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*(self._spawn_worker() for _ in range(self.size))
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)
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for worker in workers:
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self._workers.add(worker)
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await self._idle.put(worker)
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for _ in range(self.size):
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self._dispatchers.append(asyncio.create_task(self._dispatch_loop()))
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async def run(
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self,
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filepath,
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quality: int,
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maxsize: int,
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maxzoom: float,
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data: bytes | None = None,
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):
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if self._closed:
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raise PreviewError("preview worker pool closed")
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loop = asyncio.get_running_loop()
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future = loop.create_future()
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self._seq += 1
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await self._pending.put(
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(
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_preview_job_priority(filepath),
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self._seq,
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future,
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(filepath, quality, maxsize, maxzoom, data),
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)
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)
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return await future
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async def close(self) -> None:
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self._closed = True
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for task in self._dispatchers:
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task.cancel()
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if self._dispatchers:
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await asyncio.gather(*self._dispatchers, return_exceptions=True)
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self._dispatchers.clear()
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workers = list(self._workers)
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self._workers.clear()
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while not self._pending.empty():
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try:
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_priority, _seq, future, _args = self._pending.get_nowait()
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except asyncio.QueueEmpty:
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break
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if not future.done():
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future.set_exception(PreviewError("preview worker pool closed"))
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while not self._idle.empty():
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try:
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self._idle.get_nowait()
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except asyncio.QueueEmpty:
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break
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await asyncio.gather(
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*(worker.kill() for worker in workers), return_exceptions=True
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)
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async def start_preview_workers() -> None:
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"""Warm up persistent preview workers during server startup."""
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global _preview_pool
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if _preview_pool is not None:
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return
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async with _preview_pool_lock:
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if _preview_pool is not None:
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return
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pool = _PreviewWorkerPool(PREVIEW_WORKERS)
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await pool.start()
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_preview_pool = pool
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logger.info("Started %d persistent preview workers", PREVIEW_WORKERS)
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async def shutdown_preview_workers() -> None:
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"""Kill persistent preview workers (called during server shutdown)."""
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global _preview_pool
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async with _preview_pool_lock:
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pool = _preview_pool
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_preview_pool = None
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if pool is not None:
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await pool.close()
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if not _active_procs:
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return
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for proc in list(_active_procs):
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with contextlib.suppress(ProcessLookupError):
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proc.kill()
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await asyncio.gather(
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*(proc.wait() for proc in list(_active_procs)), return_exceptions=True
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)
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_active_procs.clear()
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@bp.on_request
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async def verify_preview(request):
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"""Verify access to preview routes."""
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await auth.verify(request)
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class PreviewTimeoutError(Exception):
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"""Raised when the preview subprocess exceeds PREVIEW_TIMEOUT."""
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class PreviewError(Exception):
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"""Raised when the preview subprocess exits with a non-zero status."""
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def __init__(
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self,
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message: str,
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*,
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stderr: str | None = None,
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backend: str | None = None,
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):
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super().__init__(message)
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self.stderr = stderr
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self.backend = backend
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# Max concurrent OnlyOffice conversion requests. OO has its own queue;
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# we must not flood it. This is intentionally small.
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OO_MAX_CONCURRENT = PREVIEW_WORKERS
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class OOConversionManager:
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"""Manages async OnlyOffice conversions with deduplication and concurrency limits."""
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def __init__(self, max_concurrent: int = OO_MAX_CONCURRENT):
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self._semaphore = asyncio.Semaphore(max_concurrent)
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self._in_flight: dict[str, asyncio.Future[bytes]] = {}
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self._tasks: set[asyncio.Task[None]] = set()
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self._lock = asyncio.Lock()
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async def convert(self, filepath: Path) -> bytes:
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"""Return PNG bytes for *filepath*, deduplicating concurrent requests."""
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stat = await asyncio.to_thread(filepath.stat)
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key = f"{filepath}:{stat.st_mtime_ns}"
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async with self._lock:
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if key in self._in_flight:
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future = self._in_flight[key]
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else:
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future = asyncio.get_running_loop().create_future()
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self._in_flight[key] = future
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task = asyncio.create_task(self._do_convert(filepath, key, future))
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self._tasks.add(task)
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task.add_done_callback(self._tasks.discard)
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return await future
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async def _do_convert(
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self, filepath: Path, key: str, future: asyncio.Future[bytes]
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) -> None:
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try:
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async with self._semaphore:
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png_bytes = await onlyoffice.convert_to_png_async(
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filepath, request_timeout=5.0
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)
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except Exception as e:
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future.set_exception(e)
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async with self._lock:
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self._in_flight.pop(key, None)
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else:
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future.set_result(png_bytes)
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async with self._lock:
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self._in_flight.pop(key, None)
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_oo_manager: OOConversionManager | None = None
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def get_oo_manager() -> OOConversionManager:
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"""Return the singleton OOConversionManager."""
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global _oo_manager
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if _oo_manager is None:
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_oo_manager = OOConversionManager(max_concurrent=OO_MAX_CONCURRENT)
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return _oo_manager
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async def _generate_office_preview(
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filepath: Path, quality: int, maxsize: int, maxzoom: float
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) -> tuple[bytes | None, PreviewResponse | None]:
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"""Generate a preview for an office file using OnlyOffice + worker AVIF conversion."""
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manager = get_oo_manager()
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t_oo_start = perf_counter()
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png_bytes = await manager.convert(filepath)
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t_oo_end = perf_counter()
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img, resp = await _run_preview_process(
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filepath, quality, maxsize, maxzoom, data=png_bytes
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)
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if resp is not None:
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resp.backend = "onlyoffice+" + (resp.backend or "pyvips")
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if resp.timings:
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resp.timings = [round((t_oo_end - t_oo_start) * 1000, 1), *resp.timings]
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return img, resp
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async def _run_preview_process(
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filepath, quality: int, maxsize: int, maxzoom: float, data: bytes | None = None
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) -> tuple[bytes | None, PreviewResponse | None]:
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"""Run preview request in a persistent worker process."""
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await start_preview_workers()
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if _preview_pool is None:
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raise PreviewError(f"preview worker pool unavailable for {filepath.name}")
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return await _preview_pool.run(filepath, quality, maxsize, maxzoom, data)
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def _onlyoffice_error_short_text(detail: str) -> str:
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if detail.startswith("OnlyOffice conversion error:"):
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code = detail.rsplit(":", 1)[-1].strip()
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return {
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"-8": "onlyoffice jwt error",
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"-4": "onlyoffice input error",
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"-2": "onlyoffice timeout error",
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"-1": "onlyoffice unknown error",
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}.get(code, f"onlyoffice {code} error")
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if "OnlyOffice response did not contain FileUrl" in detail:
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return "onlyoffice no-fileurl error"
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return "onlyoffice error"
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def _preview_job_priority(path) -> int:
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"""Return priority for preview job (lower=higher priority).
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Priority order: images (0) < video (1) < PDF (2) < office (3) < unknown (4)
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"""
|
|
suffix = path.suffix.lower()
|
|
if suffix in DOC_PREVIEW_SUFFIXES:
|
|
return 2
|
|
if suffix in OFFICE_PREVIEW_SUFFIXES:
|
|
return 3
|
|
mime_type, _ = mimetypes.guess_type(path.name)
|
|
if mime_type and mime_type.startswith("image/"):
|
|
return 0
|
|
if mime_type and mime_type.startswith("video/"):
|
|
return 1
|
|
return 4
|
|
|
|
|
|
def is_previewable_path(path) -> bool:
|
|
suffix = path.suffix.lower()
|
|
if suffix in DOC_PREVIEW_SUFFIXES or suffix in OFFICE_PREVIEW_SUFFIXES:
|
|
return True
|
|
mime_type, _ = mimetypes.guess_type(path.name)
|
|
if not mime_type:
|
|
return False
|
|
return mime_type.startswith(("image/", "video/"))
|
|
|
|
|
|
@bp.get("/<path:path>")
|
|
async def preview(req, path):
|
|
"""Preview a file"""
|
|
maxsize = int(req.args.get("px", 1024))
|
|
maxzoom = float(req.args.get("zoom", 2.0))
|
|
quality = int(req.args.get("q", 60))
|
|
share_token = auth.request_share_token(req)
|
|
if share_token is not None:
|
|
rel, _real_rel, filepath, is_root = sharefs.resolve_virtual_path(
|
|
share_token, path
|
|
)
|
|
if is_root:
|
|
raise NotFound from None
|
|
else:
|
|
rel = PurePosixPath(sanitize(unquote(path)))
|
|
filepath = config.config.path / rel
|
|
try:
|
|
stat = filepath.lstat()
|
|
except FileNotFoundError:
|
|
raise NotFound from None
|
|
|
|
if not is_previewable_path(filepath):
|
|
return empty(415)
|
|
|
|
etag = config.derived_secret(
|
|
"preview", rel, stat.st_mtime_ns, quality, maxsize, maxzoom
|
|
).hex()
|
|
|
|
if req.headers.if_none_match == etag:
|
|
# The client has it cached, respond 304 Not Modified
|
|
return empty(304, headers={"etag": etag})
|
|
|
|
# Check in-memory cache first (includes headers)
|
|
cached = _preview_cache.get(etag)
|
|
if cached is not None:
|
|
logger.debug(f"Preview cache hit: {rel}")
|
|
return raw(cached.body, headers=cached.headers)
|
|
|
|
# Generate preview
|
|
try:
|
|
if filepath.suffix.lower() in OFFICE_PREVIEW_SUFFIXES:
|
|
img, preview_resp = await asyncio.wait_for(
|
|
_generate_office_preview(filepath, quality, maxsize, maxzoom),
|
|
timeout=PREVIEW_TIMEOUT,
|
|
)
|
|
else:
|
|
img, preview_resp = await asyncio.wait_for(
|
|
_run_preview_process(filepath, quality, maxsize, maxzoom),
|
|
timeout=PREVIEW_TIMEOUT,
|
|
)
|
|
except TimeoutError:
|
|
logger.warning("Preview timeout for %s", filepath)
|
|
return empty(503)
|
|
except PreviewTimeoutError:
|
|
logger.warning("Preview worker timeout for %s", filepath)
|
|
return empty(503)
|
|
except httpx.HTTPStatusError:
|
|
req.ctx._log_extra = "onlyoffice N/A"
|
|
return empty(503)
|
|
except httpx.RequestError:
|
|
req.ctx._log_extra = "onlyoffice N/A"
|
|
return empty(503)
|
|
except RuntimeError as e:
|
|
detail = str(e)
|
|
if detail.startswith("OnlyOffice"):
|
|
req.ctx._log_extra = _onlyoffice_error_short_text(detail)
|
|
return empty(503)
|
|
raise
|
|
except PreviewError as e:
|
|
if e.backend:
|
|
req.ctx._log_extra = e.backend
|
|
detail = str(e)
|
|
if detail == "preview worker error" and e.stderr:
|
|
captured = e.stderr.strip()
|
|
if captured:
|
|
detail = captured.splitlines()[0]
|
|
logger.error("%s preview: %s", filepath, detail)
|
|
return empty(422)
|
|
except asyncio.CancelledError:
|
|
req.ctx._log_extra = "preview cancelled"
|
|
return empty(503)
|
|
except Exception:
|
|
logger.exception("Unhandled preview error for %s", filepath)
|
|
return empty(500)
|
|
if preview_resp and preview_resp.backend:
|
|
if preview_resp.timings:
|
|
timing_detail = "/".join(
|
|
str(round(value)) for value in preview_resp.timings
|
|
)
|
|
req.ctx._log_extra = f"{preview_resp.backend} {timing_detail} ➛"
|
|
else:
|
|
req.ctx._log_extra = preview_resp.backend
|
|
if not img:
|
|
# Preview generation failed, redirect to the file itself
|
|
return redirect(f"/files/{path}", status=303)
|
|
|
|
# Build headers and cache the full response
|
|
preview_mime = (
|
|
preview_resp.mime
|
|
if preview_resp is not None and preview_resp.mime is not None
|
|
else "image/avif"
|
|
)
|
|
savename = PurePosixPath(filepath.name).with_suffix(".avif")
|
|
headers = {
|
|
"etag": etag,
|
|
"last-modified": format_date_time(stat.st_mtime),
|
|
"cache-control": "max-age=604800, immutable"
|
|
+ ("" if config.config.public else ", private"),
|
|
"content-type": preview_mime,
|
|
"content-disposition": f"inline; filename*=UTF-8''{urllib.parse.quote(savename.as_posix())}",
|
|
}
|
|
_preview_cache.set(etag, CachedPreview(headers=headers, body=img))
|
|
|
|
return raw(img, headers=headers)
|