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#
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#
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# See the License for the specific language governing permissions and
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"""This module provides context for Kedro project."""
import abc
import logging
import logging.config
import os
import sys
from copy import deepcopy
from pathlib import Path, PurePosixPath, PureWindowsPath
from typing import Any, Dict, Iterable, Tuple, Union
from urllib.parse import urlparse
from warnings import warn
import anyconfig
from kedro import __version__
from kedro.config import ConfigLoader, MissingConfigException
from kedro.framework.hooks import get_hook_manager
from kedro.io import DataCatalog
from kedro.io.core import generate_timestamp
from kedro.pipeline import Pipeline
from kedro.pipeline.pipeline import _transcode_split
from kedro.runner.runner import AbstractRunner
from kedro.runner.sequential_runner import SequentialRunner
from kedro.utils import load_obj
from kedro.versioning import Journal
_PLUGIN_HOOKS = "kedro.hooks" # entry-point to load hooks from for installed plugins
# Kedro configuration files in the precedence order
KEDRO_CONFIGS = (".kedro.yml", "pyproject.toml")
def _version_mismatch_error(context_version) -> str:
return (
"Your Kedro project version {} does not match Kedro package version {} "
"you are running. Make sure to update your project template. See "
"https://github.com/quantumblacklabs/kedro/blob/master/RELEASE.md "
"for how to migrate your Kedro project."
).format(context_version, __version__)
def _is_relative_path(path_string: str) -> bool:
"""Checks whether a path string is a relative path.
Example:
::
>>> _is_relative_path("data/01_raw") == True
>>> _is_relative_path("logs/info.log") == True
>>> _is_relative_path("/tmp/data/01_raw") == False
>>> _is_relative_path(r"C:\\logs\\info.log") == False
>>> _is_relative_path(r"\\logs\\'info.log") == False
>>> _is_relative_path("c:/logs/info.log") == False
>>> _is_relative_path("s3://logs/info.log") == False
Args:
path_string: The path string to check.
Returns:
Whether the string is a relative path.
"""
# os.path.splitdrive does not reliably work on non-Windows systems
# breaking the coverage, using PureWindowsPath instead
is_full_windows_path_with_drive = bool(PureWindowsPath(path_string).drive)
if is_full_windows_path_with_drive:
return False
is_remote_path = bool(urlparse(path_string).scheme)
if is_remote_path:
return False
is_absolute_path = PurePosixPath(path_string).is_absolute()
if is_absolute_path:
return False
return True
def _convert_paths_to_absolute_posix(
project_path: Path, conf_dictionary: Dict[str, Any]
) -> Dict[str, Any]:
"""Turn all relative paths inside ``conf_dictionary`` into absolute paths by appending them
to ``project_path`` and convert absolute Windows paths to POSIX format. This is a hack to
make sure that we don't have to change user's working directory for logging and datasets to
work. It is important for non-standard workflows such as IPython notebook where users don't go
through `kedro run` or `run.py` entrypoints.
Example:
::
>>> conf = _convert_paths_to_absolute_posix(
>>> project_path=Path("/path/to/my/project"),
>>> conf_dictionary={
>>> "handlers": {
>>> "info_file_handler": {
>>> "filename": "logs/info.log"
>>> }
>>> }
>>> }
>>> )
>>> print(conf['handlers']['info_file_handler']['filename'])
"/path/to/my/project/logs/info.log"
Args:
project_path: The root directory to prepend to relative path to make absolute path.
conf_dictionary: The configuration containing paths to expand.
Returns:
A dictionary containing only absolute paths.
Raises:
ValueError: If the provided ``project_path`` is not an absolute path.
"""
if not project_path.is_absolute():
raise ValueError(
"project_path must be an absolute path. Received: {}".format(project_path)
)
# only check a few conf keys that are known to specify a path string as value
conf_keys_with_filepath = ("filename", "filepath", "path")
for conf_key, conf_value in conf_dictionary.items():
# if the conf_value is another dictionary, absolutify its paths first.
if isinstance(conf_value, dict):
conf_dictionary[conf_key] = _convert_paths_to_absolute_posix(
project_path, conf_value
)
continue
# if the conf_value is not a dictionary nor a string, skip
if not isinstance(conf_value, str):
continue
# if the conf_value is a string but the conf_key isn't one associated with filepath, skip
if conf_key not in conf_keys_with_filepath:
continue
if _is_relative_path(conf_value):
# Absolute local path should be in POSIX format
conf_value_absolute_path = (project_path / conf_value).as_posix()
conf_dictionary[conf_key] = conf_value_absolute_path
elif PureWindowsPath(conf_value).drive:
# Convert absolute Windows path to POSIX format
conf_dictionary[conf_key] = PureWindowsPath(conf_value).as_posix()
return conf_dictionary
def _validate_layers_for_transcoding(catalog: DataCatalog) -> None:
"""Check that transcoded names that correspond to
the same dataset also belong to the same layer.
"""
def _find_conflicts():
base_names_to_layer = {}
for current_layer, dataset_names in catalog.layers.items():
for name in dataset_names:
base_name, _ = _transcode_split(name)
known_layer = base_names_to_layer.setdefault(base_name, current_layer)
if current_layer != known_layer:
yield name
else:
base_names_to_layer[base_name] = current_layer
conflicting_datasets = sorted(_find_conflicts())
if conflicting_datasets:
error_str = ", ".join(conflicting_datasets)
raise ValueError(
f"Transcoded datasets should have the same layer. Mismatch found for: {error_str}"
)
[docs]class KedroContext(abc.ABC):
"""``KedroContext`` is the base class which holds the configuration and
Kedro's main functionality. Project-specific context class should extend
this abstract class and implement the all abstract methods.
Attributes:
CONF_ROOT: Name of root directory containing project configuration.
Default name is "conf".
hooks: The list of hooks provided by user to extend KedroContext's execution.
Example:
::
>>> from kedro.framework.context import KedroContext
>>> from kedro.pipeline import Pipeline
>>>
>>> class ProjectContext(KedroContext):
>>> @property
>>> def pipeline(self) -> Pipeline:
>>> return Pipeline([])
"""
CONF_ROOT = "conf"
# Registry for user-defined hooks to be overwritten by a project context.
hooks: Tuple = ()
[docs] def __init__(
self,
project_path: Union[Path, str],
env: str = None,
extra_params: Dict[str, Any] = None,
):
"""Create a context object by providing the root of a Kedro project and
the environment configuration subfolders (see ``kedro.config.ConfigLoader``)
Raises:
KedroContextError: If there is a mismatch
between Kedro project version and package version.
Args:
project_path: Project path to define the context for.
env: Optional argument for configuration default environment to be used
for running the pipeline. If not specified, it defaults to "local".
extra_params: Optional dictionary containing extra project parameters.
If specified, will update (and therefore take precedence over)
the parameters retrieved from the project configuration.
"""
self._project_path = Path(project_path).expanduser().resolve()
self._static_data = get_static_project_data(self._project_path)
# check the match for major and minor version (skip patch version)
if self.project_version.split(".")[:2] != __version__.split(".")[:2]:
raise KedroContextError(_version_mismatch_error(self.project_version))
self.env = env or "local"
self._extra_params = deepcopy(extra_params)
self._register_hooks(auto=True)
# we need a ConfigLoader registered in order to be able to set up logging
self._setup_logging()
@property
def static_data(self) -> Dict[str, Any]:
"""Read-only property for Kedro project static data.
Returns:
A dictionary with defined static project data.
"""
return deepcopy(self._static_data)
@property
def project_name(self) -> str:
"""Property for Kedro project name.
Returns:
Name of Kedro project.
"""
return self.static_data["project_name"]
@property
def project_version(self) -> str:
"""Property for Kedro version.
Returns:
Kedro version.
"""
return self.static_data["project_version"]
@property
def package_name(self) -> str:
"""Property for Kedro project package name.
Returns:
Name of Kedro project package.
"""
return self.static_data["package_name"]
@property
def pipeline(self) -> Pipeline:
"""Read-only property for an instance of Pipeline.
Returns:
Defined pipeline.
"""
return self._get_pipeline()
@property
def pipelines(self) -> Dict[str, Pipeline]:
"""Read-only property for an instance of Pipeline.
Returns:
A dictionary of defined pipelines.
"""
return self._get_pipelines()
def _register_hooks_setuptools(self):
"""Register pluggy hooks from setuptools entrypoints."""
hook_manager = get_hook_manager()
already_registered = hook_manager.get_plugins()
found = hook_manager.load_setuptools_entrypoints(_PLUGIN_HOOKS)
disable_plugins = set(self.static_data.get("disable_hooks_for_plugins", []))
# Get list of plugin/distinfo tuples for all setuptools registered plugins.
plugininfo = hook_manager.list_plugin_distinfo()
plugin_names = []
disabled_plugin_names = []
for plugin, dist in plugininfo:
if dist.project_name in disable_plugins:
# `unregister()` is used instead of `set_blocked()` because
# we want to disable hooks for specific plugin based on project
# name and not `entry_point` name. Also, we log project names with
# version for which hooks were registered.
hook_manager.unregister(plugin=plugin)
found -= 1
disabled_plugin_names.append(f"{dist.project_name}-{dist.version}")
elif plugin not in already_registered:
plugin_names.append(f"{dist.project_name}-{dist.version}")
if disabled_plugin_names:
logging.info(
"Hooks are disabled for plugin(s): %s",
", ".join(sorted(disabled_plugin_names)),
)
if plugin_names:
logging.info(
"Registered hooks from %d installed plugin(s): %s",
found,
", ".join(sorted(plugin_names)),
)
def _register_hooks(self, auto: bool = False) -> None:
"""Register all hooks as specified in ``hooks`` with the global ``hook_manager``,
and, optionally, from installed plugins.
Args:
auto: An optional flag to enable auto-discovery and registration of plugin hooks.
"""
hook_manager = get_hook_manager()
# enrich with hooks specified in .kedro.yml or pyproject.toml if .kedro.yml doesn't exist
hooks_locations = self.static_data.get("hooks", [])
configured_hooks = tuple(load_obj(hook) for hook in hooks_locations)
all_hooks = self.hooks + configured_hooks
for hooks_collection in all_hooks:
# Sometimes users might create more than one context instance, in which case
# hooks have already been registered, so we perform a simple check here
# to avoid an error being raised and break user's workflow.
if not hook_manager.is_registered(hooks_collection):
hook_manager.register(hooks_collection)
if auto:
self._register_hooks_setuptools()
def _get_pipeline(self, name: str = None) -> Pipeline:
name = name or "__default__"
pipelines = self._get_pipelines()
try:
return pipelines[name]
except (TypeError, KeyError) as exc:
raise KedroContextError(
f"Failed to find the pipeline named '{name}'. "
f"It needs to be generated and returned "
f"by the '_get_pipelines' function."
) from exc
def _get_pipelines(self) -> Dict[str, Pipeline]: # pylint: disable=no-self-use
"""Abstract method for a hook for changing the creation of a Pipeline instance.
Returns:
A dictionary of defined pipelines.
"""
hook_manager = get_hook_manager()
pipelines_dicts = (
hook_manager.hook.register_pipelines() # pylint: disable=no-member
)
pipelines = {} # type: Dict[str, Pipeline]
for pipeline_collection in pipelines_dicts:
duplicate_keys = pipeline_collection.keys() & pipelines.keys()
if duplicate_keys:
warn(
f"Found duplicate pipeline entries. "
f"The following will be overwritten: {', '.join(duplicate_keys)}"
)
pipelines.update(pipeline_collection)
return pipelines
@property
def project_path(self) -> Path:
"""Read-only property containing Kedro's root project directory.
Returns:
Project directory.
"""
return self._project_path
@property
def catalog(self) -> DataCatalog:
"""Read-only property referring to Kedro's ``DataCatalog`` for this context.
Returns:
DataCatalog defined in `catalog.yml`.
"""
return self._get_catalog()
@property
def params(self) -> Dict[str, Any]:
"""Read-only property referring to Kedro's parameters for this context.
Returns:
Parameters defined in `parameters.yml` with the addition of any
extra parameters passed at initialization.
"""
try:
# '**/parameters*' reads modular pipeline configs
params = self.config_loader.get(
"parameters*", "parameters*/**", "**/parameters*"
)
except MissingConfigException as exc:
warn(
"Parameters not found in your Kedro project config.\n{}".format(
str(exc)
)
)
params = {}
params.update(self._extra_params or {})
return params
def _get_catalog(
self,
save_version: str = None,
journal: Journal = None,
load_versions: Dict[str, str] = None,
) -> DataCatalog:
"""A hook for changing the creation of a DataCatalog instance.
Returns:
DataCatalog defined in `catalog.yml`.
"""
# '**/catalog*' reads modular pipeline configs
conf_catalog = self.config_loader.get("catalog*", "catalog*/**", "**/catalog*")
# turn relative paths in conf_catalog into absolute paths
# before initializing the catalog
conf_catalog = _convert_paths_to_absolute_posix(
project_path=self.project_path, conf_dictionary=conf_catalog
)
conf_creds = self._get_config_credentials()
catalog = self._create_catalog(
conf_catalog, conf_creds, save_version, journal, load_versions
)
feed_dict = self._get_feed_dict()
catalog.add_feed_dict(feed_dict)
if catalog.layers:
_validate_layers_for_transcoding(catalog)
hook_manager = get_hook_manager()
hook_manager.hook.after_catalog_created( # pylint: disable=no-member
catalog=catalog,
conf_catalog=conf_catalog,
conf_creds=conf_creds,
feed_dict=feed_dict,
save_version=save_version,
load_versions=load_versions,
run_id=self.run_id,
)
return catalog
def _create_catalog( # pylint: disable=no-self-use,too-many-arguments
self,
conf_catalog: Dict[str, Any],
conf_creds: Dict[str, Any],
save_version: str = None,
journal: Journal = None,
load_versions: Dict[str, str] = None,
) -> DataCatalog:
"""A factory method for the DataCatalog instantiation.
Returns:
DataCatalog defined in `catalog.yml`.
"""
hook_manager = get_hook_manager()
catalog = hook_manager.hook.register_catalog( # pylint: disable=no-member
catalog=conf_catalog,
credentials=conf_creds,
load_versions=load_versions,
save_version=save_version,
journal=journal,
)
return catalog or DataCatalog.from_config( # for backwards compatibility
conf_catalog, conf_creds, load_versions, save_version, journal
)
@property
def io(self) -> DataCatalog:
"""Read-only alias property referring to Kedro's ``DataCatalog`` for this
context.
Returns:
DataCatalog defined in `catalog.yml`.
"""
# pylint: disable=invalid-name
return self.catalog
def _create_config_loader( # pylint: disable=no-self-use
self, conf_paths: Iterable[str]
) -> ConfigLoader:
"""A factory method for the ConfigLoader instantiation.
Returns:
Instance of `ConfigLoader`.
"""
hook_manager = get_hook_manager()
config_loader = hook_manager.hook.register_config_loader( # pylint: disable=no-member
conf_paths=conf_paths
)
return config_loader or ConfigLoader(conf_paths) # for backwards compatibility
def _get_config_loader(self) -> ConfigLoader:
"""A hook for changing the creation of a ConfigLoader instance.
Returns:
Instance of `ConfigLoader` created by `_create_config_loader()`.
"""
conf_paths = [
str(self.project_path / self.CONF_ROOT / "base"),
str(self.project_path / self.CONF_ROOT / self.env),
]
return self._create_config_loader(conf_paths)
@property
def config_loader(self) -> ConfigLoader:
"""Read-only property referring to Kedro's ``ConfigLoader`` for this
context.
Returns:
Instance of `ConfigLoader`.
"""
return self._get_config_loader()
def _setup_logging(self) -> None:
"""Register logging specified in logging directory."""
conf_logging = self.config_loader.get("logging*", "logging*/**", "**/logging*")
# turn relative paths in logging config into absolute path
# before initialising loggers
conf_logging = _convert_paths_to_absolute_posix(
project_path=self.project_path, conf_dictionary=conf_logging
)
logging.config.dictConfig(conf_logging)
def _get_feed_dict(self) -> Dict[str, Any]:
"""Get parameters and return the feed dictionary."""
params = self.params
feed_dict = {"parameters": params}
def _add_param_to_feed_dict(param_name, param_value):
"""This recursively adds parameter paths to the `feed_dict`,
whenever `param_value` is a dictionary itself, so that users can
specify specific nested parameters in their node inputs.
Example:
>>> param_name = "a"
>>> param_value = {"b": 1}
>>> _add_param_to_feed_dict(param_name, param_value)
>>> assert feed_dict["params:a"] == {"b": 1}
>>> assert feed_dict["params:a.b"] == 1
"""
key = "params:{}".format(param_name)
feed_dict[key] = param_value
if isinstance(param_value, dict):
for key, val in param_value.items():
_add_param_to_feed_dict("{}.{}".format(param_name, key), val)
for param_name, param_value in params.items():
_add_param_to_feed_dict(param_name, param_value)
return feed_dict
def _get_config_credentials(self) -> Dict[str, Any]:
"""Getter for credentials specified in credentials directory."""
try:
conf_creds = self.config_loader.get(
"credentials*", "credentials*/**", "**/credentials*"
)
except MissingConfigException as exc:
warn(
"Credentials not found in your Kedro project config.\n{}".format(
str(exc)
)
)
conf_creds = {}
return conf_creds
# pylint: disable=too-many-arguments, no-self-use
def _filter_pipeline(
self,
pipeline: Pipeline,
tags: Iterable[str] = None,
from_nodes: Iterable[str] = None,
to_nodes: Iterable[str] = None,
node_names: Iterable[str] = None,
from_inputs: Iterable[str] = None,
) -> Pipeline:
"""Filter the pipeline as the intersection of all conditions."""
new_pipeline = pipeline
# We need to intersect with the pipeline because the order
# of operations matters, so we don't want to do it incrementally.
# As an example, with a pipeline of nodes 1,2,3, think of
# "from 1", and "only 1 and 3" - the order you do them in results in
# either 1 & 3, or just 1.
if tags:
new_pipeline &= pipeline.only_nodes_with_tags(*tags)
if not new_pipeline.nodes:
raise KedroContextError(
"Pipeline contains no nodes with tags: {}".format(str(tags))
)
if from_nodes:
new_pipeline &= pipeline.from_nodes(*from_nodes)
if to_nodes:
new_pipeline &= pipeline.to_nodes(*to_nodes)
if node_names:
new_pipeline &= pipeline.only_nodes(*node_names)
if from_inputs:
new_pipeline &= pipeline.from_inputs(*from_inputs)
if not new_pipeline.nodes:
raise KedroContextError("Pipeline contains no nodes")
return new_pipeline
@property
def run_id(self) -> Union[None, str]:
"""Unique identifier for a run / journal record, defaults to None.
If `run_id` is None, `save_version` will be used instead.
"""
return self._get_run_id()
[docs] def run( # pylint: disable=too-many-arguments,too-many-locals
self,
tags: Iterable[str] = None,
runner: AbstractRunner = None,
node_names: Iterable[str] = None,
from_nodes: Iterable[str] = None,
to_nodes: Iterable[str] = None,
from_inputs: Iterable[str] = None,
load_versions: Dict[str, str] = None,
pipeline_name: str = None,
) -> Dict[str, Any]:
"""Runs the pipeline with a specified runner.
Args:
tags: An optional list of node tags which should be used to
filter the nodes of the ``Pipeline``. If specified, only the nodes
containing *any* of these tags will be run.
runner: An optional parameter specifying the runner that you want to run
the pipeline with.
node_names: An optional list of node names which should be used to
filter the nodes of the ``Pipeline``. If specified, only the nodes
with these names will be run.
from_nodes: An optional list of node names which should be used as a
starting point of the new ``Pipeline``.
to_nodes: An optional list of node names which should be used as an
end point of the new ``Pipeline``.
from_inputs: An optional list of input datasets which should be used as a
starting point of the new ``Pipeline``.
load_versions: An optional flag to specify a particular dataset version timestamp
to load.
pipeline_name: Name of the ``Pipeline`` to execute.
Defaults to "__default__".
Raises:
KedroContextError: If the resulting ``Pipeline`` is empty
or incorrect tags are provided.
Exception: Any uncaught exception will be re-raised
after being passed to``on_pipeline_error``.
Returns:
Any node outputs that cannot be processed by the ``DataCatalog``.
These are returned in a dictionary, where the keys are defined
by the node outputs.
"""
# Report project name
logging.info("** Kedro project %s", self.project_path.name)
pipeline = self._get_pipeline(name=pipeline_name)
filtered_pipeline = self._filter_pipeline(
pipeline=pipeline,
tags=tags,
from_nodes=from_nodes,
to_nodes=to_nodes,
node_names=node_names,
from_inputs=from_inputs,
)
save_version = self._get_save_version()
run_id = self.run_id or save_version
record_data = {
"run_id": run_id,
"project_path": str(self.project_path),
"env": self.env,
"kedro_version": self.project_version,
"tags": tags,
"from_nodes": from_nodes,
"to_nodes": to_nodes,
"node_names": node_names,
"from_inputs": from_inputs,
"load_versions": load_versions,
"pipeline_name": pipeline_name,
"extra_params": self._extra_params,
}
journal = Journal(record_data)
catalog = self._get_catalog(
save_version=save_version, journal=journal, load_versions=load_versions
)
# Run the runner
runner = runner or SequentialRunner()
hook_manager = get_hook_manager()
hook_manager.hook.before_pipeline_run( # pylint: disable=no-member
run_params=record_data, pipeline=filtered_pipeline, catalog=catalog
)
try:
run_result = runner.run(filtered_pipeline, catalog, run_id)
except Exception as exc:
hook_manager.hook.on_pipeline_error( # pylint: disable=no-member
error=exc,
run_params=record_data,
pipeline=filtered_pipeline,
catalog=catalog,
)
raise exc
hook_manager.hook.after_pipeline_run( # pylint: disable=no-member
run_params=record_data,
run_result=run_result,
pipeline=filtered_pipeline,
catalog=catalog,
)
return run_result
def _get_run_id(
self, *args, **kwargs # pylint: disable=unused-argument
) -> Union[None, str]:
"""A hook for generating a unique identifier for a
run / journal record, defaults to None.
If None, `save_version` will be used instead.
"""
return None
def _get_save_version(
self, *args, **kwargs # pylint: disable=unused-argument
) -> str:
"""Generate unique ID for dataset versioning, defaults to timestamp.
`save_version` MUST be something that can be ordered, in order to
easily determine the latest version.
"""
return generate_timestamp()
def get_static_project_data(project_path: Union[str, Path]) -> Dict[str, Any]:
"""Read static project data from `<project_path>/.kedro.yml` config file if it
exists otherwise from `<project_path>/pyproject.toml` (under `[tool.kedro]` section).
Args:
project_path: Local path to project root directory to look up `.kedro.yml` or
`pyproject.toml` in.
Raises:
KedroContextError: Neither '.kedro.yml' nor `pyproject.toml` was found
or `[tool.kedro]` section is missing in `pyproject.toml`, or config file
cannot be parsed.
Returns:
A mapping that contains static project data.
"""
project_path = Path(project_path).expanduser().resolve()
config_paths = [
project_path / conf_file
for conf_file in KEDRO_CONFIGS
if (project_path / conf_file).is_file()
]
if not config_paths:
configs = ", ".join(KEDRO_CONFIGS)
raise KedroContextError(
f"Could not find any of configuration files '{configs}' in {project_path}. "
f"If you have created your project with Kedro "
f"version <0.15.0, make sure to update your project template. "
f"See https://github.com/quantumblacklabs/kedro/blob/master/RELEASE.md"
f"#migration-guide-from-kedro-014-to-kedro-0150 "
f"for how to migrate your Kedro project."
)
# First found wins
kedro_config = config_paths[0]
try:
static_data = anyconfig.load(kedro_config)
except Exception as exc:
raise KedroContextError(f"Failed to parse '{kedro_config.name}' file.") from exc
if kedro_config.suffix == ".toml":
try:
static_data = static_data["tool"]["kedro"]
except KeyError as exc:
raise KedroContextError(
f"There's no '[tool.kedro]' section in the '{kedro_config.name}'. "
f"Please add '[tool.kedro]' section to the file with appropriate "
f"configuration parameters."
) from exc
source_dir = Path(static_data.get("source_dir", "src")).expanduser()
source_dir = (project_path / source_dir).resolve()
static_data["source_dir"] = source_dir
static_data["config_file"] = kedro_config
return static_data
def validate_source_path(source_path: Path, project_path: Path):
"""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:
KedroContextError: Either source_path is not relative to project_path or
source_path does not exist.
"""
try:
source_path.relative_to(project_path)
except ValueError as exc:
raise KedroContextError(
f"Source path '{source_path}' has to be relative to "
f"your project root '{project_path}'."
) from exc
if not source_path.exists():
raise KedroContextError(f"Source path '{source_path}' cannot be found.")
def load_package_context(
project_path: Path, package_name: str, **kwargs
) -> KedroContext:
"""Loads the KedroContext object of a Kedro project package,
as output by `kedro package` and installed via `pip`.
This function is only intended to be used in a project's `run.py`.
If you are looking to load KedroContext object for any other workflow,
you might want to use ``load_context`` instead.
Args:
project_path: Path to the Kedro project, i.e. where `conf/` resides.
package_name: Name of the installed Kedro project package.
kwargs: Optional kwargs for ``ProjectContext`` class in `run.py`.
Returns:
Instance of ``KedroContext`` class defined in Kedro project.
Raises:
KedroContextError: Neither '.kedro.yml' nor `pyproject.toml` was found
or `[tool.kedro]` section is missing in `pyproject.toml`, or loaded context
has package conflict.
"""
context_path = f"{package_name}.run.ProjectContext"
try:
context_class = load_obj(context_path)
except ModuleNotFoundError as exc:
raise KedroContextError(
f"Cannot load context object from {context_path} for package {package_name}."
) from exc
# update kwargs with env from the environment variable (defaults to None if not set)
# need to do this because some CLI command (e.g `kedro run`) defaults to passing
# in `env=None`
kwargs["env"] = kwargs.get("env") or os.getenv("KEDRO_ENV")
context = context_class(project_path=project_path, **kwargs)
return context
[docs]def load_context(project_path: Union[str, Path], **kwargs) -> KedroContext:
"""Loads the KedroContext object of a Kedro Project.
This is the default way to load the KedroContext object for normal workflows such as
CLI, Jupyter Notebook, Plugins, etc. It assumes the following project structure
under the given project_path::
<project_path>
|__ <src_dir>
|__ .kedro.yml
|__ kedro_cli.py
|__ pyproject.toml
The name of the <scr_dir> is `src` by default. The `.kedro.yml` or `pyproject.toml` can
be used for configuration. If `.kedro.yml` exists, it will be used otherwise, `pyproject.toml`
will be treated as the configuration file (Kedro configuration should be under
`[tool.kedro]` section).
Args:
project_path: Path to the Kedro project.
kwargs: Optional kwargs for ``ProjectContext`` class in `run.py`.
Returns:
Instance of ``KedroContext`` class defined in Kedro project.
Raises:
KedroContextError: Neither '.kedro.yml' nor `pyproject.toml` was found
or `[tool.kedro]` section is missing in `pyproject.toml`, or loaded context
has package conflict.
"""
project_path = Path(project_path).expanduser().resolve()
static_data = get_static_project_data(project_path)
source_dir = static_data["source_dir"]
validate_source_path(source_dir, project_path)
if "context_path" not in static_data:
conf_file = static_data["config_file"].name
raise KedroContextError(
f"'{conf_file}' doesn't have a required `context_path` field. "
f"Please refer to the documentation."
)
if str(source_dir) not in sys.path:
sys.path.insert(0, str(source_dir))
if "PYTHONPATH" not in os.environ:
os.environ["PYTHONPATH"] = str(source_dir)
context_class = load_obj(static_data["context_path"])
# update kwargs with env from the environment variable
# (defaults to None if not set)
# need to do this because some CLI command (e.g `kedro run`) defaults to
# passing in `env=None`
kwargs["env"] = kwargs.get("env") or os.getenv("KEDRO_ENV")
context = context_class(project_path=project_path, **kwargs)
return context
[docs]class KedroContextError(Exception):
"""Error occurred when loading project and running context pipeline."""