Source code for kedro.framework.startup

"""This module provides metadata for a Kedro project."""
import os
import sys
from pathlib import Path
from typing import NamedTuple, Union

import anyconfig

from kedro import __version__ as kedro_version
from kedro.framework.project import configure_project

_PYPROJECT = "pyproject.toml"

[docs]class ProjectMetadata(NamedTuple): """Structure holding project metadata derived from `pyproject.toml`""" config_file: Path package_name: str project_name: str project_path: Path project_version: str source_dir: Path
def _version_mismatch_error(project_version) -> str: return ( f"Your Kedro project version {project_version} does not match Kedro package " f"version {kedro_version} you are running. Make sure to update your project " f"template. See " f"for how to migrate your Kedro project." ) def _is_project(project_path: Union[str, Path]) -> bool: metadata_file = Path(project_path).expanduser().resolve() / _PYPROJECT if not metadata_file.is_file(): return False try: return "[tool.kedro]" in metadata_file.read_text(encoding="utf-8") except Exception: # pylint: disable=broad-except return False def _get_project_metadata(project_path: Union[str, Path]) -> ProjectMetadata: """Read project metadata from `<project_path>/pyproject.toml` config file, under the `[tool.kedro]` section. Args: project_path: Local path to project root directory to look up `pyproject.toml` in. Raises: RuntimeError: `pyproject.toml` was not found or the `[tool.kedro]` section is missing, or config file cannot be parsed. ValueError: If project version is different from Kedro package version. Note: Project version is the Kedro version the project was generated with. Returns: A named tuple that contains project metadata. """ project_path = Path(project_path).expanduser().resolve() pyproject_toml = project_path / _PYPROJECT if not pyproject_toml.is_file(): raise RuntimeError( f"Could not find the project configuration file '{_PYPROJECT}' in {project_path}. " f"If you have created your project with Kedro " f"version <0.17.0, make sure to update your project template. " f"See" f"#migration-guide-from-kedro-016-to-kedro-0170 " f"for how to migrate your Kedro project." ) try: metadata_dict = anyconfig.load(pyproject_toml) except Exception as exc: raise RuntimeError(f"Failed to parse '{_PYPROJECT}' file.") from exc try: metadata_dict = metadata_dict["tool"]["kedro"] except KeyError as exc: raise RuntimeError( f"There's no '[tool.kedro]' section in the '{_PYPROJECT}'. " f"Please add '[tool.kedro]' section to the file with appropriate " f"configuration parameters." ) from exc mandatory_keys = ["package_name", "project_name", "project_version"] missing_keys = [key for key in mandatory_keys if key not in metadata_dict] if missing_keys: raise RuntimeError(f"Missing required keys {missing_keys} from '{_PYPROJECT}'.") # check the match for major and minor version (skip patch version) if metadata_dict["project_version"].split(".")[:2] != kedro_version.split(".")[:2]: raise ValueError(_version_mismatch_error(metadata_dict["project_version"])) source_dir = Path(metadata_dict.get("source_dir", "src")).expanduser() source_dir = (project_path / source_dir).resolve() metadata_dict["source_dir"] = source_dir metadata_dict["config_file"] = pyproject_toml metadata_dict["project_path"] = project_path metadata_dict.pop("pipeline", {}) # don't include micro-packaging specs try: return ProjectMetadata(**metadata_dict) except TypeError as exc: expected_keys = mandatory_keys + ["source_dir"] raise RuntimeError( f"Found unexpected keys in '{_PYPROJECT}'. Make sure " f"it only contains the following keys: {expected_keys}." ) from exc def _validate_source_path(source_path: Path, project_path: Path) -> None: """Validate the source path exists and is relative to the project path. Args: source_path: Absolute source path. project_path: Path to the Kedro project. Raises: ValueError: If source_path is not relative to project_path. NotADirectoryError: If source_path does not exist. """ try: source_path.relative_to(project_path) except ValueError as exc: raise ValueError( f"Source path '{source_path}' has to be relative to " f"your project root '{project_path}'." ) from exc if not source_path.exists(): raise NotADirectoryError(f"Source path '{source_path}' cannot be found.") def _add_src_to_path(source_dir: Path, project_path: Path) -> None: _validate_source_path(source_dir, project_path) if str(source_dir) not in sys.path: sys.path.insert(0, str(source_dir)) python_path = os.getenv("PYTHONPATH") or "" if str(source_dir) not in python_path: sep = os.pathsep if python_path else "" os.environ["PYTHONPATH"] = f"{str(source_dir)}{sep}{python_path}"
[docs]def bootstrap_project(project_path: Path) -> ProjectMetadata: """Run setup required at the beginning of the workflow when running in project mode, and return project metadata. """ metadata = _get_project_metadata(project_path) _add_src_to_path(metadata.source_dir, project_path) configure_project(metadata.package_name) return metadata