wzy-warehouse
194 lines
6.7 KiB
Python
194 lines
6.7 KiB
Python
"""
|
||
QGIS 环境检测与子进程配置模块。
|
||
|
||
主进程运行在 Python 3.10，无法直接加载 QGIS 的 Python 3.12 C 扩展。
|
||
所有 QGIS 操作通过 subprocess 调用 QGIS Python 3.12 执行。
|
||
|
||
本模块提供：
|
||
- get_qgis_python_path(): 检测 QGIS Python 3.12 解释器路径
|
||
- build_qgis_command(): 构建通过 .bat 启动 QGIS 子进程的命令
|
||
- is_qgis_available(): 检查 QGIS 是否可用
|
||
- get_runner_script(): 获取 qgis_runner.py 的路径
|
||
"""
|
||
import os
|
||
import tempfile
|
||
from pathlib import Path
|
||
|
||
from app.config.paths import get_logger
|
||
|
||
logger = get_logger("qgis.env")
|
||
|
||
|
||
def get_qgis_python_path(qgis_root: str = None) -> str | None:
|
||
"""
|
||
检测 QGIS 自带的 Python 3.12 解释器路径。
|
||
|
||
Windows: {QGIS_ROOT}/apps/Python312/python3.exe
|
||
|
||
Returns:
|
||
解释器绝对路径，不存在则返回 None
|
||
"""
|
||
if qgis_root is None:
|
||
qgis_root = _detect_qgis_root()
|
||
if qgis_root is None:
|
||
return None
|
||
|
||
import platform
|
||
if platform.system() == "Windows":
|
||
for name in ("python3.exe", "python.exe"):
|
||
candidate = os.path.join(qgis_root, "apps", "Python312", name)
|
||
if os.path.isfile(candidate):
|
||
logger.info(f"检测到 QGIS Python: {candidate}")
|
||
return candidate
|
||
logger.warning(f"未找到 QGIS Python 3.12")
|
||
return None
|
||
else:
|
||
import shutil
|
||
|
||
# 优先检查环境变量
|
||
env_python = os.environ.get("QGIS_PYTHON_PATH")
|
||
if env_python and os.path.isfile(env_python):
|
||
logger.info(f"QGIS_PYTHON_PATH 指定: {env_python}")
|
||
return env_python
|
||
|
||
# 搜索标准 Linux QGIS 安装路径
|
||
linux_paths = [
|
||
"/usr/bin/qgis", # Ubuntu/Debian apt 安装
|
||
"/usr/bin/qgis.bin",
|
||
"/opt/QGIS/apps/Python312/bin/python3", # 独立安装器
|
||
"/opt/QGIS/apps/Python3/bin/python3",
|
||
"/usr/libexec/qgis/python3", # Fedora/RHEL
|
||
]
|
||
for candidate in linux_paths:
|
||
if os.path.isfile(candidate):
|
||
logger.info(f"检测到 QGIS 可执行文件: {candidate}")
|
||
return candidate
|
||
|
||
# 回退到系统 Python（如果 qgis.core 可导入）
|
||
sys_python = shutil.which("python3") or shutil.which("python")
|
||
if sys_python:
|
||
logger.info(f"Linux 环境，使用系统 Python: {sys_python}")
|
||
return sys_python
|
||
return None
|
||
|
||
|
||
def build_qgis_command(qgis_root: str = None) -> list[str]:
|
||
"""
|
||
构建通过 .bat 包装器启动 QGIS 子进程的命令列表。
|
||
设置环境变量并启动 QGIS Python 3.12。
|
||
"""
|
||
import platform
|
||
if platform.system() != "Windows":
|
||
python_path = get_qgis_python_path(qgis_root)
|
||
if not python_path:
|
||
raise RuntimeError("未找到 QGIS Python 解释器")
|
||
return [python_path, get_runner_script()]
|
||
|
||
if qgis_root is None:
|
||
qgis_root = _detect_qgis_root() or "D:/QGIS"
|
||
|
||
python_path = get_qgis_python_path(qgis_root)
|
||
if not python_path:
|
||
raise RuntimeError("未找到 QGIS Python 3.12 解释器")
|
||
|
||
runner_script = get_runner_script()
|
||
if not os.path.isfile(runner_script):
|
||
raise RuntimeError(f"QGIS Runner 脚本不存在: {runner_script}")
|
||
|
||
bat_path = _generate_bat_wrapper(qgis_root, python_path, runner_script)
|
||
return ["cmd.exe", "/c", bat_path]
|
||
|
||
|
||
def is_qgis_available(qgis_root: str = None) -> bool:
|
||
"""检查 QGIS 环境是否可用"""
|
||
return get_qgis_python_path(qgis_root) is not None
|
||
|
||
|
||
def get_runner_script() -> str:
|
||
"""获取 qgis_runner.py 的绝对路径"""
|
||
return str(Path(__file__).parent / "qgis_runner.py")
|
||
|
||
|
||
def _generate_bat_wrapper(qgis_root: str, python_path: str, runner_script: str) -> str:
|
||
"""生成 .bat 包装脚本，设置 QGIS 环境变量并启动 runner"""
|
||
# 自动检测 QGIS 应用目录（qgis-ltr 或 qgis）
|
||
qgis_app_dir = os.path.join(qgis_root, "apps", "qgis-ltr")
|
||
if not os.path.isdir(qgis_app_dir):
|
||
qgis_app_dir = os.path.join(qgis_root, "apps", "qgis")
|
||
qgis_app_dir = qgis_app_dir.replace("/", "\\")
|
||
|
||
# 自动检测 PROJ 目录
|
||
proj_data = ""
|
||
for pd in [
|
||
os.path.join(qgis_app_dir, "share", "proj"),
|
||
os.path.join(qgis_root, "share", "proj"),
|
||
os.path.join(qgis_root, "apps", "gdal", "share", "proj"),
|
||
]:
|
||
if os.path.isfile(os.path.join(pd, "proj.db")):
|
||
proj_data = pd.replace("/", "\\")
|
||
break
|
||
|
||
python_dir = os.path.join(qgis_root, "apps", "Python312").replace("/", "\\")
|
||
qt5_plugins = os.path.join(qgis_root, "apps", "Qt5", "plugins").replace("/", "\\")
|
||
qtplugins = os.path.join(qgis_app_dir, "qtplugins").replace("/", "\\")
|
||
gdal_data = os.path.join(qgis_root, "apps", "gdal", "share", "gdal").replace("/", "\\")
|
||
qgis_python_dir = os.path.join(qgis_app_dir, "python").replace("/", "\\")
|
||
qgis_bin = os.path.join(qgis_app_dir, "bin").replace("/", "\\")
|
||
qt5_bin = os.path.join(qgis_root, "apps", "Qt5", "bin").replace("/", "\\")
|
||
gdal_lib = os.path.join(qgis_root, "apps", "gdal", "lib").replace("/", "\\")
|
||
|
||
proj_line = f'set "PROJ_DATA={proj_data}"' if proj_data else "REM PROJ_DATA not found"
|
||
|
||
bat_content = f"""@echo off
|
||
chcp 65001 >nul
|
||
set "PYTHONHOME={python_dir}"
|
||
set "PYTHONPATH={qgis_python_dir}"
|
||
set "QGIS_PREFIX_PATH={qgis_app_dir}"
|
||
set "QT_PLUGIN_PATH={qtplugins};{qt5_plugins}"
|
||
set "GDAL_DATA={gdal_data}"
|
||
{proj_line}
|
||
set "PYTHONUTF8=1"
|
||
set "GDAL_FILENAME_IS_UTF8=YES"
|
||
set "VSI_CACHE=TRUE"
|
||
set "VSI_CACHE_SIZE=1000000"
|
||
set "PATH={qgis_bin};{qt5_bin};{gdal_lib};%PATH%"
|
||
"{python_path}" "{runner_script}" %*
|
||
"""
|
||
|
||
bat_dir = os.path.join(tempfile.gettempdir(), "qgis_runner")
|
||
os.makedirs(bat_dir, exist_ok=True)
|
||
bat_path = os.path.join(bat_dir, "run_qgis.bat")
|
||
with open(bat_path, "w", encoding="utf-8") as f:
|
||
f.write(bat_content)
|
||
logger.debug(f"生成 QGIS 包装脚本: {bat_path}")
|
||
return bat_path
|
||
|
||
|
||
def _detect_qgis_root() -> str | None:
|
||
"""
|
||
自动检测 QGIS 安装根目录。
|
||
|
||
优先级：
|
||
1. 环境变量 QGIS_ROOT
|
||
2. Windows 默认路径 D:/QGIS
|
||
3. Linux 常见路径
|
||
"""
|
||
env_root = os.environ.get("QGIS_ROOT")
|
||
if env_root and os.path.isdir(env_root):
|
||
return env_root
|
||
|
||
import platform
|
||
if platform.system() == "Windows":
|
||
for candidate in ["D:/QGIS", "C:/OSGeo4W", "C:/QGIS"]:
|
||
if os.path.isdir(candidate):
|
||
logger.info(f"检测到 QGIS 根目录: {candidate}")
|
||
return candidate
|
||
else:
|
||
for candidate in ["/usr", "/opt/QGIS", "/home/QGIS"]:
|
||
if os.path.isdir(candidate):
|
||
logger.info(f"检测到 QGIS 根目录: {candidate}")
|
||
return candidate
|
||
|
||
logger.warning("未检测到 QGIS 安装目录")
|
||
return None
|