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parallel.py

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt

from __future__ import annotations

import functools
import warnings
from collections import defaultdict
from collections.abc import Iterable, Sequence
from typing import TYPE_CHECKING, Any

import dill

from pylint import reporters
from pylint.lint.utils import _augment_sys_path
from pylint.message import Message
from pylint.typing import FileItem
from pylint.utils import LinterStats, merge_stats

try:
    import multiprocessing
except ImportError:
    multiprocessing = None  # type: ignore[assignment]

try:
    from concurrent.futures import ProcessPoolExecutor
except ImportError:
    ProcessPoolExecutor = None  # type: ignore[assignment,misc]

if TYPE_CHECKING:
    from pylint.lint import PyLinter

# PyLinter object used by worker processes when checking files using parallel mode
# should only be used by the worker processes
_worker_linter: PyLinter | None = None

def _worker_initialize(
    linter: bytes, extra_packages_paths: Sequence[str] | None = None
) -> None:
    """Function called to initialize a worker for a Process within a concurrent Pool.

:param linter: A linter-class (PyLinter) instance pickled with dill
    :param extra_packages_paths: Extra entries to be added to sys.path
    """
    global _worker_linter  # pylint: disable=global-statement
    _worker_linter = dill.loads(linter)
    assert _worker_linter

# On the worker process side the messages are just collected and passed back to
    # parent process as _worker_check_file function's return value
    _worker_linter.set_reporter(reporters.CollectingReporter())
    _worker_linter.open()

if extra_packages_paths:
        _augment_sys_path(extra_packages_paths)

def _worker_check_single_file(
    file_item: FileItem,
) -> tuple[
    int,
    # TODO: 3.0: Make this only str after deprecation has been removed
    str | None,
    str,
    str | None,
    list[Message],
    LinterStats,
    int,
    defaultdict[str, list[Any]],
]:
    if not _worker_linter:
        raise RuntimeError("Worker linter not yet initialised")
    _worker_linter.open()
    _worker_linter.check_single_file_item(file_item)
    mapreduce_data = defaultdict(list)
    for checker in _worker_linter.get_checkers():
        data = checker.get_map_data()
        if data is not None:
            mapreduce_data[checker.name].append(data)
    msgs = _worker_linter.reporter.messages
    assert isinstance(_worker_linter.reporter, reporters.CollectingReporter)
    _worker_linter.reporter.reset()
    if _worker_linter.current_name is None:
        warnings.warn(
            (
                "In pylint 3.0 the current_name attribute of the linter object should be a string. "
                "If unknown it should be initialized as an empty string."
            ),
            DeprecationWarning,
        )
    return (
        id(multiprocessing.current_process()),
        _worker_linter.current_name,
        file_item.filepath,
        _worker_linter.file_state.base_name,
        msgs,
        _worker_linter.stats,
        _worker_linter.msg_status,
        mapreduce_data,
    )

def _merge_mapreduce_data(
    linter: PyLinter,
    all_mapreduce_data: defaultdict[int, list[defaultdict[str, list[Any]]]],
) -> None:
    """Merges map/reduce data across workers, invoking relevant APIs on checkers."""
    # First collate the data and prepare it, so we can send it to the checkers for
    # validation. The intent here is to collect all the mapreduce data for all checker-
    # runs across processes - that will then be passed to a static method on the
    # checkers to be reduced and further processed.
    collated_map_reduce_data: defaultdict[str, list[Any]] = defaultdict(list)
    for linter_data in all_mapreduce_data.values():
        for run_data in linter_data:
            for checker_name, data in run_data.items():
                collated_map_reduce_data[checker_name].extend(data)

# Send the data to checkers that support/require consolidated data
    original_checkers = linter.get_checkers()
    for checker in original_checkers:
        if checker.name in collated_map_reduce_data:
            # Assume that if the check has returned map/reduce data that it has the
            # reducer function
            checker.reduce_map_data(linter, collated_map_reduce_data[checker.name])

def check_parallel(
    linter: PyLinter,
    jobs: int,
    files: Iterable[FileItem],
    extra_packages_paths: Sequence[str] | None = None,
) -> None:
    """Use the given linter to lint the files with given amount of workers (jobs).

This splits the work filestream-by-filestream. If you need to do work across
    multiple files, as in the similarity-checker, then implement the map/reduce mixin functionality.
    """
    # The linter is inherited by all the pool's workers, i.e. the linter
    # is identical to the linter object here. This is required so that
    # a custom PyLinter object can be used.
    initializer = functools.partial(
        _worker_initialize, extra_packages_paths=extra_packages_paths
    )
    with ProcessPoolExecutor(
        max_workers=jobs, initializer=initializer, initargs=(dill.dumps(linter),)
    ) as executor:
        linter.open()
        all_stats = []
        all_mapreduce_data: defaultdict[
            int, list[defaultdict[str, list[Any]]]
        ] = defaultdict(list)

# Maps each file to be worked on by a single _worker_check_single_file() call,
        # collecting any map/reduce data by checker module so that we can 'reduce' it
        # later.
        for (
            worker_idx,  # used to merge map/reduce data across workers
            module,
            file_path,
            base_name,
            messages,
            stats,
            msg_status,
            mapreduce_data,
        ) in executor.map(_worker_check_single_file, files):
            linter.file_state.base_name = base_name
            linter.file_state._is_base_filestate = False
            linter.set_current_module(module, file_path)
            for msg in messages:
                linter.reporter.handle_message(msg)
            all_stats.append(stats)
            all_mapreduce_data[worker_idx].append(mapreduce_data)
            linter.msg_status |= msg_status

_merge_mapreduce_data(linter, all_mapreduce_data)
    linter.stats = merge_stats([linter.stats] + all_stats)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-05-15 06:32:25
..	dir	-	root/root	drwxr-xr-x	2025-05-15 06:32:25
__pycache__	dir	-	root/root	drwxr-xr-x	2025-05-15 06:32:25
__init__.py	text/x-script.python	1.46 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
base_options.py	text/x-script.python	20.95 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
caching.py	text/x-script.python	2.32 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
expand_modules.py	text/x-script.python	6.93 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
message_state_handler.py	text/x-script.python	17.07 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
parallel.py	text/x-script.python	6.4 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
pylinter.py	text/x-script.python	52.36 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
report_functions.py	text/x-script.python	2.88 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
run.py	text/x-script.python	8.83 KB	root/root	-rw-r--r--	2025-04-17 01:10:59
utils.py	text/x-script.python	4.71 KB	root/root	-rw-r--r--	2025-04-17 01:10:59