Source code for _pytest.cacheprovider

# mypy: allow-untyped-defs
"""Implementation of the cache provider."""

# This plugin was not named "cache" to avoid conflicts with the external
# pytest-cache version.
import dataclasses
import json
import os
from pathlib import Path
import tempfile
from typing import Dict
from typing import final
from typing import Generator
from typing import Iterable
from typing import List
from typing import Optional
from typing import Set
from typing import Union

from .pathlib import resolve_from_str
from .pathlib import rm_rf
from .reports import CollectReport
from _pytest import nodes
from _pytest._io import TerminalWriter
from _pytest.config import Config
from _pytest.config import ExitCode
from _pytest.config import hookimpl
from _pytest.config.argparsing import Parser
from _pytest.deprecated import check_ispytest
from _pytest.fixtures import fixture
from _pytest.fixtures import FixtureRequest
from _pytest.main import Session
from _pytest.nodes import Directory
from _pytest.nodes import File
from _pytest.reports import TestReport


README_CONTENT = """\
# pytest cache directory #

This directory contains data from the pytest's cache plugin,
which provides the `--lf` and `--ff` options, as well as the `cache` fixture.

**Do not** commit this to version control.

See [the docs](https://docs.pytest.org/en/stable/how-to/cache.html) for more information.
"""

CACHEDIR_TAG_CONTENT = b"""\
Signature: 8a477f597d28d172789f06886806bc55
# This file is a cache directory tag created by pytest.
# For information about cache directory tags, see:
#	https://bford.info/cachedir/spec.html
"""


[docs] @final @dataclasses.dataclass class Cache: """Instance of the `cache` fixture.""" _cachedir: Path = dataclasses.field(repr=False) _config: Config = dataclasses.field(repr=False) # Sub-directory under cache-dir for directories created by `mkdir()`. _CACHE_PREFIX_DIRS = "d" # Sub-directory under cache-dir for values created by `set()`. _CACHE_PREFIX_VALUES = "v" def __init__( self, cachedir: Path, config: Config, *, _ispytest: bool = False ) -> None: check_ispytest(_ispytest) self._cachedir = cachedir self._config = config @classmethod def for_config(cls, config: Config, *, _ispytest: bool = False) -> "Cache": """Create the Cache instance for a Config. :meta private: """ check_ispytest(_ispytest) cachedir = cls.cache_dir_from_config(config, _ispytest=True) if config.getoption("cacheclear") and cachedir.is_dir(): cls.clear_cache(cachedir, _ispytest=True) return cls(cachedir, config, _ispytest=True) @classmethod def clear_cache(cls, cachedir: Path, _ispytest: bool = False) -> None: """Clear the sub-directories used to hold cached directories and values. :meta private: """ check_ispytest(_ispytest) for prefix in (cls._CACHE_PREFIX_DIRS, cls._CACHE_PREFIX_VALUES): d = cachedir / prefix if d.is_dir(): rm_rf(d) @staticmethod def cache_dir_from_config(config: Config, *, _ispytest: bool = False) -> Path: """Get the path to the cache directory for a Config. :meta private: """ check_ispytest(_ispytest) return resolve_from_str(config.getini("cache_dir"), config.rootpath) def warn(self, fmt: str, *, _ispytest: bool = False, **args: object) -> None: """Issue a cache warning. :meta private: """ check_ispytest(_ispytest) import warnings from _pytest.warning_types import PytestCacheWarning warnings.warn( PytestCacheWarning(fmt.format(**args) if args else fmt), self._config.hook, stacklevel=3, ) def _mkdir(self, path: Path) -> None: self._ensure_cache_dir_and_supporting_files() path.mkdir(exist_ok=True, parents=True)
[docs] def mkdir(self, name: str) -> Path: """Return a directory path object with the given name. If the directory does not yet exist, it will be created. You can use it to manage files to e.g. store/retrieve database dumps across test sessions. .. versionadded:: 7.0 :param name: Must be a string not containing a ``/`` separator. Make sure the name contains your plugin or application identifiers to prevent clashes with other cache users. """ path = Path(name) if len(path.parts) > 1: raise ValueError("name is not allowed to contain path separators") res = self._cachedir.joinpath(self._CACHE_PREFIX_DIRS, path) self._mkdir(res) return res
def _getvaluepath(self, key: str) -> Path: return self._cachedir.joinpath(self._CACHE_PREFIX_VALUES, Path(key))
[docs] def get(self, key: str, default): """Return the cached value for the given key. If no value was yet cached or the value cannot be read, the specified default is returned. :param key: Must be a ``/`` separated value. Usually the first name is the name of your plugin or your application. :param default: The value to return in case of a cache-miss or invalid cache value. """ path = self._getvaluepath(key) try: with path.open("r", encoding="UTF-8") as f: return json.load(f) except (ValueError, OSError): return default
[docs] def set(self, key: str, value: object) -> None: """Save value for the given key. :param key: Must be a ``/`` separated value. Usually the first name is the name of your plugin or your application. :param value: Must be of any combination of basic python types, including nested types like lists of dictionaries. """ path = self._getvaluepath(key) try: self._mkdir(path.parent) except OSError as exc: self.warn( f"could not create cache path {path}: {exc}", _ispytest=True, ) return data = json.dumps(value, ensure_ascii=False, indent=2) try: f = path.open("w", encoding="UTF-8") except OSError as exc: self.warn( f"cache could not write path {path}: {exc}", _ispytest=True, ) else: with f: f.write(data)
def _ensure_cache_dir_and_supporting_files(self) -> None: """Create the cache dir and its supporting files.""" if self._cachedir.is_dir(): return self._cachedir.parent.mkdir(parents=True, exist_ok=True) with tempfile.TemporaryDirectory( prefix="pytest-cache-files-", dir=self._cachedir.parent, ) as newpath: path = Path(newpath) # Reset permissions to the default, see #12308. # Note: there's no way to get the current umask atomically, eek. umask = os.umask(0o022) os.umask(umask) path.chmod(0o777 - umask) with open(path.joinpath("README.md"), "xt", encoding="UTF-8") as f: f.write(README_CONTENT) with open(path.joinpath(".gitignore"), "xt", encoding="UTF-8") as f: f.write("# Created by pytest automatically.\n*\n") with open(path.joinpath("CACHEDIR.TAG"), "xb") as f: f.write(CACHEDIR_TAG_CONTENT) path.rename(self._cachedir) # Create a directory in place of the one we just moved so that `TemporaryDirectory`'s # cleanup doesn't complain. # # TODO: pass ignore_cleanup_errors=True when we no longer support python < 3.10. See # https://github.com/python/cpython/issues/74168. Note that passing delete=False would # do the wrong thing in case of errors and isn't supported until python 3.12. path.mkdir()
class LFPluginCollWrapper: def __init__(self, lfplugin: "LFPlugin") -> None: self.lfplugin = lfplugin self._collected_at_least_one_failure = False @hookimpl(wrapper=True) def pytest_make_collect_report( self, collector: nodes.Collector ) -> Generator[None, CollectReport, CollectReport]: res = yield if isinstance(collector, (Session, Directory)): # Sort any lf-paths to the beginning. lf_paths = self.lfplugin._last_failed_paths # Use stable sort to prioritize last failed. def sort_key(node: Union[nodes.Item, nodes.Collector]) -> bool: return node.path in lf_paths res.result = sorted( res.result, key=sort_key, reverse=True, ) elif isinstance(collector, File): if collector.path in self.lfplugin._last_failed_paths: result = res.result lastfailed = self.lfplugin.lastfailed # Only filter with known failures. if not self._collected_at_least_one_failure: if not any(x.nodeid in lastfailed for x in result): return res self.lfplugin.config.pluginmanager.register( LFPluginCollSkipfiles(self.lfplugin), "lfplugin-collskip" ) self._collected_at_least_one_failure = True session = collector.session result[:] = [ x for x in result if x.nodeid in lastfailed # Include any passed arguments (not trivial to filter). or session.isinitpath(x.path) # Keep all sub-collectors. or isinstance(x, nodes.Collector) ] return res class LFPluginCollSkipfiles: def __init__(self, lfplugin: "LFPlugin") -> None: self.lfplugin = lfplugin @hookimpl def pytest_make_collect_report( self, collector: nodes.Collector ) -> Optional[CollectReport]: if isinstance(collector, File): if collector.path not in self.lfplugin._last_failed_paths: self.lfplugin._skipped_files += 1 return CollectReport( collector.nodeid, "passed", longrepr=None, result=[] ) return None class LFPlugin: """Plugin which implements the --lf (run last-failing) option.""" def __init__(self, config: Config) -> None: self.config = config active_keys = "lf", "failedfirst" self.active = any(config.getoption(key) for key in active_keys) assert config.cache self.lastfailed: Dict[str, bool] = config.cache.get("cache/lastfailed", {}) self._previously_failed_count: Optional[int] = None self._report_status: Optional[str] = None self._skipped_files = 0 # count skipped files during collection due to --lf if config.getoption("lf"): self._last_failed_paths = self.get_last_failed_paths() config.pluginmanager.register( LFPluginCollWrapper(self), "lfplugin-collwrapper" ) def get_last_failed_paths(self) -> Set[Path]: """Return a set with all Paths of the previously failed nodeids and their parents.""" rootpath = self.config.rootpath result = set() for nodeid in self.lastfailed: path = rootpath / nodeid.split("::")[0] result.add(path) result.update(path.parents) return {x for x in result if x.exists()} def pytest_report_collectionfinish(self) -> Optional[str]: if self.active and self.config.getoption("verbose") >= 0: return "run-last-failure: %s" % self._report_status return None def pytest_runtest_logreport(self, report: TestReport) -> None: if (report.when == "call" and report.passed) or report.skipped: self.lastfailed.pop(report.nodeid, None) elif report.failed: self.lastfailed[report.nodeid] = True def pytest_collectreport(self, report: CollectReport) -> None: passed = report.outcome in ("passed", "skipped") if passed: if report.nodeid in self.lastfailed: self.lastfailed.pop(report.nodeid) self.lastfailed.update((item.nodeid, True) for item in report.result) else: self.lastfailed[report.nodeid] = True @hookimpl(wrapper=True, tryfirst=True) def pytest_collection_modifyitems( self, config: Config, items: List[nodes.Item] ) -> Generator[None, None, None]: res = yield if not self.active: return res if self.lastfailed: previously_failed = [] previously_passed = [] for item in items: if item.nodeid in self.lastfailed: previously_failed.append(item) else: previously_passed.append(item) self._previously_failed_count = len(previously_failed) if not previously_failed: # Running a subset of all tests with recorded failures # only outside of it. self._report_status = "%d known failures not in selected tests" % ( len(self.lastfailed), ) else: if self.config.getoption("lf"): items[:] = previously_failed config.hook.pytest_deselected(items=previously_passed) else: # --failedfirst items[:] = previously_failed + previously_passed noun = "failure" if self._previously_failed_count == 1 else "failures" suffix = " first" if self.config.getoption("failedfirst") else "" self._report_status = ( f"rerun previous {self._previously_failed_count} {noun}{suffix}" ) if self._skipped_files > 0: files_noun = "file" if self._skipped_files == 1 else "files" self._report_status += f" (skipped {self._skipped_files} {files_noun})" else: self._report_status = "no previously failed tests, " if self.config.getoption("last_failed_no_failures") == "none": self._report_status += "deselecting all items." config.hook.pytest_deselected(items=items[:]) items[:] = [] else: self._report_status += "not deselecting items." return res def pytest_sessionfinish(self, session: Session) -> None: config = self.config if config.getoption("cacheshow") or hasattr(config, "workerinput"): return assert config.cache is not None saved_lastfailed = config.cache.get("cache/lastfailed", {}) if saved_lastfailed != self.lastfailed: config.cache.set("cache/lastfailed", self.lastfailed) class NFPlugin: """Plugin which implements the --nf (run new-first) option.""" def __init__(self, config: Config) -> None: self.config = config self.active = config.option.newfirst assert config.cache is not None self.cached_nodeids = set(config.cache.get("cache/nodeids", [])) @hookimpl(wrapper=True, tryfirst=True) def pytest_collection_modifyitems( self, items: List[nodes.Item] ) -> Generator[None, None, None]: res = yield if self.active: new_items: Dict[str, nodes.Item] = {} other_items: Dict[str, nodes.Item] = {} for item in items: if item.nodeid not in self.cached_nodeids: new_items[item.nodeid] = item else: other_items[item.nodeid] = item items[:] = self._get_increasing_order( new_items.values() ) + self._get_increasing_order(other_items.values()) self.cached_nodeids.update(new_items) else: self.cached_nodeids.update(item.nodeid for item in items) return res def _get_increasing_order(self, items: Iterable[nodes.Item]) -> List[nodes.Item]: return sorted(items, key=lambda item: item.path.stat().st_mtime, reverse=True) def pytest_sessionfinish(self) -> None: config = self.config if config.getoption("cacheshow") or hasattr(config, "workerinput"): return if config.getoption("collectonly"): return assert config.cache is not None config.cache.set("cache/nodeids", sorted(self.cached_nodeids)) def pytest_addoption(parser: Parser) -> None: group = parser.getgroup("general") group.addoption( "--lf", "--last-failed", action="store_true", dest="lf", help="Rerun only the tests that failed " "at the last run (or all if none failed)", ) group.addoption( "--ff", "--failed-first", action="store_true", dest="failedfirst", help="Run all tests, but run the last failures first. " "This may re-order tests and thus lead to " "repeated fixture setup/teardown.", ) group.addoption( "--nf", "--new-first", action="store_true", dest="newfirst", help="Run tests from new files first, then the rest of the tests " "sorted by file mtime", ) group.addoption( "--cache-show", action="append", nargs="?", dest="cacheshow", help=( "Show cache contents, don't perform collection or tests. " "Optional argument: glob (default: '*')." ), ) group.addoption( "--cache-clear", action="store_true", dest="cacheclear", help="Remove all cache contents at start of test run", ) cache_dir_default = ".pytest_cache" if "TOX_ENV_DIR" in os.environ: cache_dir_default = os.path.join(os.environ["TOX_ENV_DIR"], cache_dir_default) parser.addini("cache_dir", default=cache_dir_default, help="Cache directory path") group.addoption( "--lfnf", "--last-failed-no-failures", action="store", dest="last_failed_no_failures", choices=("all", "none"), default="all", help="With ``--lf``, determines whether to execute tests when there " "are no previously (known) failures or when no " "cached ``lastfailed`` data was found. " "``all`` (the default) runs the full test suite again. " "``none`` just emits a message about no known failures and exits successfully.", ) def pytest_cmdline_main(config: Config) -> Optional[Union[int, ExitCode]]: if config.option.cacheshow and not config.option.help: from _pytest.main import wrap_session return wrap_session(config, cacheshow) return None @hookimpl(tryfirst=True) def pytest_configure(config: Config) -> None: config.cache = Cache.for_config(config, _ispytest=True) config.pluginmanager.register(LFPlugin(config), "lfplugin") config.pluginmanager.register(NFPlugin(config), "nfplugin") @fixture def cache(request: FixtureRequest) -> Cache: """Return a cache object that can persist state between testing sessions. cache.get(key, default) cache.set(key, value) Keys must be ``/`` separated strings, where the first part is usually the name of your plugin or application to avoid clashes with other cache users. Values can be any object handled by the json stdlib module. """ assert request.config.cache is not None return request.config.cache def pytest_report_header(config: Config) -> Optional[str]: """Display cachedir with --cache-show and if non-default.""" if config.option.verbose > 0 or config.getini("cache_dir") != ".pytest_cache": assert config.cache is not None cachedir = config.cache._cachedir # TODO: evaluate generating upward relative paths # starting with .., ../.. if sensible try: displaypath = cachedir.relative_to(config.rootpath) except ValueError: displaypath = cachedir return f"cachedir: {displaypath}" return None def cacheshow(config: Config, session: Session) -> int: from pprint import pformat assert config.cache is not None tw = TerminalWriter() tw.line("cachedir: " + str(config.cache._cachedir)) if not config.cache._cachedir.is_dir(): tw.line("cache is empty") return 0 glob = config.option.cacheshow[0] if glob is None: glob = "*" dummy = object() basedir = config.cache._cachedir vdir = basedir / Cache._CACHE_PREFIX_VALUES tw.sep("-", "cache values for %r" % glob) for valpath in sorted(x for x in vdir.rglob(glob) if x.is_file()): key = str(valpath.relative_to(vdir)) val = config.cache.get(key, dummy) if val is dummy: tw.line("%s contains unreadable content, will be ignored" % key) else: tw.line("%s contains:" % key) for line in pformat(val).splitlines(): tw.line(" " + line) ddir = basedir / Cache._CACHE_PREFIX_DIRS if ddir.is_dir(): contents = sorted(ddir.rglob(glob)) tw.sep("-", "cache directories for %r" % glob) for p in contents: # if p.is_dir(): # print("%s/" % p.relative_to(basedir)) if p.is_file(): key = str(p.relative_to(basedir)) tw.line(f"{key} is a file of length {p.stat().st_size:d}") return 0