87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
"""PDF 下载 — 从 arXiv 下载论文 PDF。"""
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from __future__ import annotations
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import logging
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import os
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import shutil
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from pathlib import Path
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import requests
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from app.utils import PAPERS_DIR, TMP_DIR
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logger = logging.getLogger(__name__)
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# ── 自定义异常 ──────────────────────────────────────────────────────────
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class PdfDownloadError(Exception):
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pass
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# ── 路径工具 ────────────────────────────────────────────────────────────
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def paper_dir(arxiv_id: str) -> Path:
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return PAPERS_DIR / arxiv_id
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def tmp_dir(arxiv_id: str) -> Path:
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return TMP_DIR / arxiv_id
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# ── PDF 下载 ────────────────────────────────────────────────────────────
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# 复用 TCP 连接的 session
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_http_session: requests.Session | None = None
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def _get_session() -> requests.Session:
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global _http_session
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if _http_session is None:
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_http_session = requests.Session()
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_http_session.headers.update({"User-Agent": "hf-daily-papers/1.0"})
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# 代理：优先 $PROXY_SERVER，其次 settings.http_proxy
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proxy = os.environ.get("PROXY_SERVER")
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if proxy:
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_http_session.proxies = {"http": proxy, "https": proxy}
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logger.info("PDF download using proxy from $PROXY_SERVER: %s", proxy)
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return _http_session
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async def download_pdf(arxiv_id: str, pdf_url: str) -> Path:
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"""下载 PDF 到 data/tmp/{arxiv_id}/paper.pdf。"""
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if not pdf_url:
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raise PdfDownloadError(f"no pdf_url for {arxiv_id}")
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dest_dir = tmp_dir(arxiv_id)
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dest_dir.mkdir(parents=True, exist_ok=True)
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dest = dest_dir / "paper.pdf"
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try:
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session = _get_session()
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resp = session.get(pdf_url, timeout=120, allow_redirects=True)
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resp.raise_for_status()
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dest.write_bytes(resp.content)
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except Exception as exc:
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raise PdfDownloadError(f"failed to download PDF for {arxiv_id}: {exc}") from exc
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logger.info("Downloaded PDF: %s (%d bytes)", arxiv_id, dest.stat().st_size)
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return dest
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# ── 临时文件清理 ────────────────────────────────────────────────────────
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def cleanup_tmp(arxiv_id: str) -> None:
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"""清理 data/tmp/{arxiv_id}/ 目录。"""
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td = tmp_dir(arxiv_id)
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if td.exists():
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try:
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shutil.rmtree(td)
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logger.debug("Cleaned tmp: %s", arxiv_id)
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except Exception:
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logger.warning("Failed to clean tmp for %s", arxiv_id, exc_info=True)
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