bf9199189a
- core/printing.py: SumatraPDF silent print backend (dry_run, timeout, error capture) - core/print_document.py: orchestrate generate() + print, per-report paper size, printer fallback - core/print_api.py: FastAPI POST /api/print + GET /api/health, HTTPBearer auth, English Swagger at /api/docs - serve.py: uvicorn entrypoint - config: printers/print/api sections in settings.yaml + core/settings.py - requirements.txt: add fastapi, uvicorn - .gitignore: ignore logs/
65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
"""打印后端：把已生成的 PDF 静默送到物理/网络打印机。
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MVP 使用 SumatraPDF 命令行打印（轻量、支持 -print-to 指定打印机与纸张，
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配合 -silent 适合服务端无人值守打印）。
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"""
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from __future__ import annotations
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import subprocess
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from pathlib import Path
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def build_command(
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sumatrapdf_path: str, printer: str, settings: str, pdf_path: str
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) -> list[str]:
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"""构造 SumatraPDF 打印命令。"""
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return [
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sumatrapdf_path,
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"-print-to",
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printer,
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"-print-settings",
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settings,
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"-silent",
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pdf_path,
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]
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def print_pdf(
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pdf_path: str | Path,
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printer: str,
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settings: str = "paper=A4,orientation=portrait,color=bw",
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sumatrapdf_path: str = "C:/Program Files/SumatraPDF/SumatraPDF.exe",
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timeout: int = 60,
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dry_run: bool = False,
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) -> dict:
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"""调用 SumatraPDF 把 PDF 静默打印到指定打印机。
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返回结构化结果；dry_run=True 时只构造命令并上报，不真正执行（用于验证链路）。
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"""
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pdf_path = str(pdf_path)
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cmd = build_command(sumatrapdf_path, printer, settings, pdf_path)
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result: dict = {
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"printer": printer,
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"pdf": pdf_path,
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"command": cmd,
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"dry_run": dry_run,
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}
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if dry_run:
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result["ok"] = True
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result["note"] = "dry_run: command constructed, not executed"
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return result
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try:
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proc = subprocess.run(
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cmd, capture_output=True, text=True, timeout=timeout, check=False
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)
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result["returncode"] = proc.returncode
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result["stdout"] = proc.stdout
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result["stderr"] = proc.stderr
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result["ok"] = proc.returncode == 0
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if proc.returncode != 0:
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result["error"] = (proc.stderr or proc.stdout or "unknown error").strip()
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except subprocess.TimeoutExpired:
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result["ok"] = False
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result["error"] = f"print timeout after {timeout}s"
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return result
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