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application.py
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"""Module containing the application logic for Flake8.""" import argparse import configparser import json import logging import time from typing import Dict from typing import List from typing import Optional from typing import Sequence from typing import Set from typing import Tuple import flake8 from flake8 import checker from flake8 import defaults from flake8 import exceptions from flake8 import style_guide from flake8 import utils from flake8.formatting.base import BaseFormatter from flake8.main import debug from flake8.main import options from flake8.options import aggregator from flake8.options import config from flake8.options import manager from flake8.plugins import finder from flake8.plugins import reporter LOG = logging.getLogger(__name__) class Application: """Abstract our application into a class.""" def __init__(self) -> None: """Initialize our application.""" #: The timestamp when the Application instance was instantiated. self.start_time = time.time() #: The timestamp when the Application finished reported errors. self.end_time: Optional[float] = None #: The prelimary argument parser for handling options required for #: obtaining and parsing the configuration file. self.prelim_arg_parser = options.stage1_arg_parser() #: The instance of :class:`flake8.options.manager.OptionManager` used #: to parse and handle the options and arguments passed by the user self.option_manager: Optional[manager.OptionManager] = None self.plugins: Optional[finder.Plugins] = None #: The user-selected formatter from :attr:`formatting_plugins` self.formatter: Optional[BaseFormatter] = None #: The :class:`flake8.style_guide.StyleGuideManager` built from the #: user's options self.guide: Optional[style_guide.StyleGuideManager] = None #: The :class:`flake8.checker.Manager` that will handle running all of #: the checks selected by the user. self.file_checker_manager: Optional[checker.Manager] = None #: The user-supplied options parsed into an instance of #: :class:`argparse.Namespace` self.options: Optional[argparse.Namespace] = None #: The number of errors, warnings, and other messages after running #: flake8 and taking into account ignored errors and lines. self.result_count = 0 #: The total number of errors before accounting for ignored errors and #: lines. self.total_result_count = 0 #: Whether or not something catastrophic happened and we should exit #: with a non-zero status code self.catastrophic_failure = False #: The parsed diff information self.parsed_diff: Dict[str, Set[int]] = {} def parse_preliminary_options( self, argv: Sequence[str] ) -> Tuple[argparse.Namespace, List[str]]: """Get preliminary options from the CLI, pre-plugin-loading. We need to know the values of a few standard options so that we can locate configuration files and configure logging. Since plugins aren't loaded yet, there may be some as-yet-unknown options; we ignore those for now, they'll be parsed later when we do real option parsing. :param argv: Command-line arguments passed in directly. :returns: Populated namespace and list of remaining argument strings. """ args, rest = self.prelim_arg_parser.parse_known_args(argv) # XXX (ericvw): Special case "forwarding" the output file option so # that it can be reparsed again for the BaseFormatter.filename. if args.output_file: rest.extend(("--output-file", args.output_file)) return args, rest def exit_code(self) -> int: """Return the program exit code.""" if self.catastrophic_failure: return 1 assert self.options is not None if self.options.exit_zero: return 0 else: return int(self.result_count > 0) def find_plugins( self, cfg: configparser.RawConfigParser, cfg_dir: str, *, enable_extensions: Optional[str], require_plugins: Optional[str], ) -> None: """Find and load the plugins for this application. Set :attr:`plugins` based on loaded plugins. """ opts = finder.parse_plugin_options( cfg, cfg_dir, enable_extensions=enable_extensions, require_plugins=require_plugins, ) raw = finder.find_plugins(cfg, opts) self.plugins = finder.load_plugins(raw, opts) def register_plugin_options(self) -> None: """Register options provided by plugins to our option manager.""" assert self.plugins is not None self.option_manager = manager.OptionManager( version=flake8.__version__, plugin_versions=self.plugins.versions_str(), parents=[self.prelim_arg_parser], ) options.register_default_options(self.option_manager) self.option_manager.register_plugins(self.plugins) def parse_configuration_and_cli( self, cfg: configparser.RawConfigParser, cfg_dir: str, argv: List[str], ) -> None: """Parse configuration files and the CLI options.""" assert self.option_manager is not None assert self.plugins is not None self.options = aggregator.aggregate_options( self.option_manager, cfg, cfg_dir, argv, ) if self.options.bug_report: info = debug.information(flake8.__version__, self.plugins) print(json.dumps(info, indent=2, sort_keys=True)) raise SystemExit(0) if self.options.diff: LOG.warning( "the --diff option is deprecated and will be removed in a " "future version." ) self.parsed_diff = utils.parse_unified_diff() for loaded in self.plugins.all_plugins(): parse_options = getattr(loaded.obj, "parse_options", None) if parse_options is None: continue # XXX: ideally we wouldn't have two forms of parse_options try: parse_options( self.option_manager, self.options, self.options.filenames, ) except TypeError: parse_options(self.options) def make_formatter(self) -> None: """Initialize a formatter based on the parsed options.""" assert self.plugins is not None assert self.options is not None self.formatter = reporter.make(self.plugins.reporters, self.options) def make_guide(self) -> None: """Initialize our StyleGuide.""" assert self.formatter is not None assert self.options is not None self.guide = style_guide.StyleGuideManager( self.options, self.formatter ) if self.options.diff: self.guide.add_diff_ranges(self.parsed_diff) def make_file_checker_manager(self) -> None: """Initialize our FileChecker Manager.""" assert self.guide is not None assert self.plugins is not None self.file_checker_manager = checker.Manager( style_guide=self.guide, plugins=self.plugins.checkers, ) def run_checks(self) -> None: """Run the actual checks with the FileChecker Manager. This method encapsulates the logic to make a :class:`~flake8.checker.Manger` instance run the checks it is managing. """ assert self.options is not None assert self.file_checker_manager is not None if self.options.diff: files: Optional[List[str]] = sorted(self.parsed_diff) if not files: return else: files = None self.file_checker_manager.start(files) try: self.file_checker_manager.run() except exceptions.PluginExecutionFailed as plugin_failed: print(str(plugin_failed)) print("Run flake8 with greater verbosity to see more details") self.catastrophic_failure = True LOG.info("Finished running") self.file_checker_manager.stop() self.end_time = time.time() def report_benchmarks(self) -> None: """Aggregate, calculate, and report benchmarks for this run.""" assert self.options is not None if not self.options.benchmark: return assert self.file_checker_manager is not None assert self.end_time is not None time_elapsed = self.end_time - self.start_time statistics = [("seconds elapsed", time_elapsed)] add_statistic = statistics.append for statistic in defaults.STATISTIC_NAMES + ("files",): value = self.file_checker_manager.statistics[statistic] total_description = f"total {statistic} processed" add_statistic((total_description, value)) per_second_description = f"{statistic} processed per second" add_statistic((per_second_description, int(value / time_elapsed))) assert self.formatter is not None self.formatter.show_benchmarks(statistics) def report_errors(self) -> None: """Report all the errors found by flake8 3.0. This also updates the :attr:`result_count` attribute with the total number of errors, warnings, and other messages found. """ LOG.info("Reporting errors") assert self.file_checker_manager is not None results = self.file_checker_manager.report() self.total_result_count, self.result_count = results LOG.info( "Found a total of %d violations and reported %d", self.total_result_count, self.result_count, ) def report_statistics(self) -> None: """Aggregate and report statistics from this run.""" assert self.options is not None if not self.options.statistics: return assert self.formatter is not None assert self.guide is not None self.formatter.show_statistics(self.guide.stats) def initialize(self, argv: Sequence[str]) -> None: """Initialize the application to be run. This finds the plugins, registers their options, and parses the command-line arguments. """ # NOTE(sigmavirus24): When updating this, make sure you also update # our legacy API calls to these same methods. prelim_opts, remaining_args = self.parse_preliminary_options(argv) flake8.configure_logging(prelim_opts.verbose, prelim_opts.output_file) cfg, cfg_dir = config.load_config( config=prelim_opts.config, extra=prelim_opts.append_config, isolated=prelim_opts.isolated, ) self.find_plugins( cfg, cfg_dir, enable_extensions=prelim_opts.enable_extensions, require_plugins=prelim_opts.require_plugins, ) self.register_plugin_options() self.parse_configuration_and_cli(cfg, cfg_dir, remaining_args) self.make_formatter() self.make_guide() self.make_file_checker_manager() def report(self) -> None: """Report errors, statistics, and benchmarks.""" assert self.formatter is not None self.formatter.start() self.report_errors() self.report_statistics() self.report_benchmarks() self.formatter.stop() def _run(self, argv: Sequence[str]) -> None: self.initialize(argv) self.run_checks() self.report() def run(self, argv: Sequence[str]) -> None: """Run our application. This method will also handle KeyboardInterrupt exceptions for the entirety of the flake8 application. If it sees a KeyboardInterrupt it will forcibly clean up the :class:`~flake8.checker.Manager`. """ try: self._run(argv) except KeyboardInterrupt as exc: print("... stopped") LOG.critical("Caught keyboard interrupt from user") LOG.exception(exc) self.catastrophic_failure = True except exceptions.ExecutionError as exc: print("There was a critical error during execution of Flake8:") print(exc) LOG.exception(exc) self.catastrophic_failure = True except exceptions.EarlyQuit: self.catastrophic_failure = True print("... stopped while processing files") else: assert self.options is not None if self.options.count: print(self.result_count)