Rename Store to Stash and make it public

changelog/8920.feature.rst

@@ -0,0 +1,2 @@
+Added :class:`pytest.Stash`, a facility for plugins to store their data on :class:`~pytest.Config` and :class:`~_pytest.nodes.Node`\s in a type-safe and conflict-free manner.
+See :ref:`plugin-stash` for details.

doc/en/how-to/writing_hook_functions.rst

@@ -311,3 +311,42 @@ declaring the hook functions directly in your plugin module, for example:
 
 This has the added benefit of allowing you to conditionally install hooks
 depending on which plugins are installed.
+
+.. _plugin-stash:
+
+Storing data on items across hook functions
+-------------------------------------------
+
+Plugins often need to store data on :class:`~pytest.Item`\s in one hook
+implementation, and access it in another. One common solution is to just
+assign some private attribute directly on the item, but type-checkers like
+mypy frown upon this, and it may also cause conflicts with other plugins.
+So pytest offers a better way to do this, :attr:`_pytest.nodes.Node.stash <item.stash>`.
+
+To use the "stash" in your plugins, first create "stash keys" somewhere at the
+top level of your plugin:
+
+.. code-block:: python
+
+    been_there_key: pytest.StashKey[bool]()
+    done_that_key: pytest.StashKey[str]()
+
+then use the keys to stash your data at some point:
+
+.. code-block:: python
+
+    def pytest_runtest_setup(item: pytest.Item) -> None:
+        item.stash[been_there_key] = True
+        item.stash[done_that_key] = "no"
+
+and retrieve them at another point:
+
+.. code-block:: python
+
+    def pytest_runtest_teardown(item: pytest.Item) -> None:
+        if not item.stash[been_there_key]:
+            print("Oh?")
+        item.stash[done_that_key] = "yes!"
+
+Stashes are available on all node types (like :class:`~pytest.Class`,
+:class:`~pytest.Session`) and also on :class:`~pytest.Config`, if needed.

doc/en/reference/reference.rst

@@ -962,6 +962,18 @@ Result used within :ref:`hook wrappers <hookwrapper>`.
 .. automethod:: pluggy.callers._Result.get_result
 .. automethod:: pluggy.callers._Result.force_result
 
+Stash
+~~~~~
+
+.. autoclass:: pytest.Stash
+    :special-members: __setitem__, __getitem__, __delitem__, __contains__, __len__
+    :members:
+
+.. autoclass:: pytest.StashKey
+    :show-inheritance:
+    :members:
+
+
 Global Variables
 ----------------
 

src/_pytest/assertion/__init__.py

@@ -88,13 +88,13 @@ def __init__(self, config: Config, mode) -> None:
 
 def install_importhook(config: Config) -> rewrite.AssertionRewritingHook:
     """Try to install the rewrite hook, raise SystemError if it fails."""
-    config._store[assertstate_key] = AssertionState(config, "rewrite")
-    config._store[assertstate_key].hook = hook = rewrite.AssertionRewritingHook(config)
+    config.stash[assertstate_key] = AssertionState(config, "rewrite")
+    config.stash[assertstate_key].hook = hook = rewrite.AssertionRewritingHook(config)
     sys.meta_path.insert(0, hook)
-    config._store[assertstate_key].trace("installed rewrite import hook")
+    config.stash[assertstate_key].trace("installed rewrite import hook")
 
     def undo() -> None:
-        hook = config._store[assertstate_key].hook
+        hook = config.stash[assertstate_key].hook
         if hook is not None and hook in sys.meta_path:
             sys.meta_path.remove(hook)
 
@@ -106,7 +106,7 @@ def pytest_collection(session: "Session") -> None:
     # This hook is only called when test modules are collected
     # so for example not in the managing process of pytest-xdist
     # (which does not collect test modules).
-    assertstate = session.config._store.get(assertstate_key, None)
+    assertstate = session.config.stash.get(assertstate_key, None)
     if assertstate:
         if assertstate.hook is not None:
             assertstate.hook.set_session(session)
@@ -169,7 +169,7 @@ def call_assertion_pass_hook(lineno: int, orig: str, expl: str) -> None:
 
 
 def pytest_sessionfinish(session: "Session") -> None:
-    assertstate = session.config._store.get(assertstate_key, None)
+    assertstate = session.config.stash.get(assertstate_key, None)
     if assertstate:
         if assertstate.hook is not None:
             assertstate.hook.set_session(None)

src/_pytest/assertion/rewrite.py

@@ -38,13 +38,13 @@
 from _pytest.main import Session
 from _pytest.pathlib import absolutepath
 from _pytest.pathlib import fnmatch_ex
-from _pytest.store import StoreKey
+from _pytest.stash import StashKey
 
 if TYPE_CHECKING:
     from _pytest.assertion import AssertionState
 
 
-assertstate_key = StoreKey["AssertionState"]()
+assertstate_key = StashKey["AssertionState"]()
 
 
 # pytest caches rewritten pycs in pycache dirs
@@ -87,7 +87,7 @@ def find_spec(
     ) -> Optional[importlib.machinery.ModuleSpec]:
         if self._writing_pyc:
             return None
-        state = self.config._store[assertstate_key]
+        state = self.config.stash[assertstate_key]
         if self._early_rewrite_bailout(name, state):
             return None
         state.trace("find_module called for: %s" % name)
@@ -131,7 +131,7 @@ def exec_module(self, module: types.ModuleType) -> None:
         assert module.__spec__ is not None
         assert module.__spec__.origin is not None
         fn = Path(module.__spec__.origin)
-        state = self.config._store[assertstate_key]
+        state = self.config.stash[assertstate_key]
 
         self._rewritten_names.add(module.__name__)
 

src/_pytest/config/__init__.py

@@ -56,7 +56,7 @@
 from _pytest.pathlib import import_path
 from _pytest.pathlib import ImportMode
 from _pytest.pathlib import resolve_package_path
-from _pytest.store import Store
+from _pytest.stash import Stash
 from _pytest.warning_types import PytestConfigWarning
 
 if TYPE_CHECKING:
@@ -923,6 +923,15 @@ def __init__(
         :type: PytestPluginManager
         """
 
+        self.stash = Stash()
+        """A place where plugins can store information on the config for their
+        own use.
+
+        :type: Stash
+        """
+        # Deprecated alias. Was never public. Can be removed in a few releases.
+        self._store = self.stash
+
         from .compat import PathAwareHookProxy
 
         self.trace = self.pluginmanager.trace.root.get("config")
@@ -931,9 +940,6 @@ def __init__(
         self._override_ini: Sequence[str] = ()
         self._opt2dest: Dict[str, str] = {}
         self._cleanup: List[Callable[[], None]] = []
-        # A place where plugins can store information on the config for their
-        # own use. Currently only intended for internal plugins.
-        self._store = Store()
         self.pluginmanager.register(self, "pytestconfig")
         self._configured = False
         self.hook.pytest_addoption.call_historic(

src/_pytest/faulthandler.py

@@ -8,11 +8,11 @@
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
 from _pytest.nodes import Item
-from _pytest.store import StoreKey
+from _pytest.stash import StashKey
 
 
-fault_handler_stderr_key = StoreKey[TextIO]()
-fault_handler_originally_enabled_key = StoreKey[bool]()
+fault_handler_stderr_key = StashKey[TextIO]()
+fault_handler_originally_enabled_key = StashKey[bool]()
 
 
 def pytest_addoption(parser: Parser) -> None:
@@ -27,20 +27,20 @@ def pytest_configure(config: Config) -> None:
     import faulthandler
 
     stderr_fd_copy = os.dup(get_stderr_fileno())
-    config._store[fault_handler_stderr_key] = open(stderr_fd_copy, "w")
-    config._store[fault_handler_originally_enabled_key] = faulthandler.is_enabled()
-    faulthandler.enable(file=config._store[fault_handler_stderr_key])
+    config.stash[fault_handler_stderr_key] = open(stderr_fd_copy, "w")
+    config.stash[fault_handler_originally_enabled_key] = faulthandler.is_enabled()
+    faulthandler.enable(file=config.stash[fault_handler_stderr_key])
 
 
 def pytest_unconfigure(config: Config) -> None:
     import faulthandler
 
     faulthandler.disable()
     # Close the dup file installed during pytest_configure.
-    if fault_handler_stderr_key in config._store:
-        config._store[fault_handler_stderr_key].close()
-        del config._store[fault_handler_stderr_key]
-    if config._store.get(fault_handler_originally_enabled_key, False):
+    if fault_handler_stderr_key in config.stash:
+        config.stash[fault_handler_stderr_key].close()
+        del config.stash[fault_handler_stderr_key]
+    if config.stash.get(fault_handler_originally_enabled_key, False):
         # Re-enable the faulthandler if it was originally enabled.
         faulthandler.enable(file=get_stderr_fileno())
 
@@ -67,7 +67,7 @@ def get_timeout_config_value(config: Config) -> float:
 @pytest.hookimpl(hookwrapper=True, trylast=True)
 def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
     timeout = get_timeout_config_value(item.config)
-    stderr = item.config._store[fault_handler_stderr_key]
+    stderr = item.config.stash[fault_handler_stderr_key]
     if timeout > 0 and stderr is not None:
         import faulthandler
 

src/_pytest/fixtures.py

@@ -62,7 +62,7 @@
 from _pytest.outcomes import TEST_OUTCOME
 from _pytest.pathlib import absolutepath
 from _pytest.pathlib import bestrelpath
-from _pytest.store import StoreKey
+from _pytest.stash import StashKey
 
 if TYPE_CHECKING:
     from typing import Deque
@@ -149,7 +149,7 @@ def get_scope_node(
 
 
 # Used for storing artificial fixturedefs for direct parametrization.
-name2pseudofixturedef_key = StoreKey[Dict[str, "FixtureDef[Any]"]]()
+name2pseudofixturedef_key = StashKey[Dict[str, "FixtureDef[Any]"]]()
 
 
 def add_funcarg_pseudo_fixture_def(
@@ -199,7 +199,7 @@ def add_funcarg_pseudo_fixture_def(
             name2pseudofixturedef = None
         else:
             default: Dict[str, FixtureDef[Any]] = {}
-            name2pseudofixturedef = node._store.setdefault(
+            name2pseudofixturedef = node.stash.setdefault(
                 name2pseudofixturedef_key, default
             )
         if name2pseudofixturedef is not None and argname in name2pseudofixturedef:

src/_pytest/junitxml.py

@@ -30,11 +30,11 @@
 from _pytest.config.argparsing import Parser
 from _pytest.fixtures import FixtureRequest
 from _pytest.reports import TestReport
-from _pytest.store import StoreKey
+from _pytest.stash import StashKey
 from _pytest.terminal import TerminalReporter
 
 
-xml_key = StoreKey["LogXML"]()
+xml_key = StashKey["LogXML"]()
 
 
 def bin_xml_escape(arg: object) -> str:
@@ -267,7 +267,7 @@ def _warn_incompatibility_with_xunit2(
     """Emit a PytestWarning about the given fixture being incompatible with newer xunit revisions."""
     from _pytest.warning_types import PytestWarning
 
-    xml = request.config._store.get(xml_key, None)
+    xml = request.config.stash.get(xml_key, None)
     if xml is not None and xml.family not in ("xunit1", "legacy"):
         request.node.warn(
             PytestWarning(
@@ -322,7 +322,7 @@ def add_attr_noop(name: str, value: object) -> None:
 
     attr_func = add_attr_noop
 
-    xml = request.config._store.get(xml_key, None)
+    xml = request.config.stash.get(xml_key, None)
     if xml is not None:
         node_reporter = xml.node_reporter(request.node.nodeid)
         attr_func = node_reporter.add_attribute
@@ -370,7 +370,7 @@ def record_func(name: str, value: object) -> None:
         __tracebackhide__ = True
         _check_record_param_type("name", name)
 
-    xml = request.config._store.get(xml_key, None)
+    xml = request.config.stash.get(xml_key, None)
     if xml is not None:
         record_func = xml.add_global_property  # noqa
     return record_func
@@ -428,7 +428,7 @@ def pytest_configure(config: Config) -> None:
     # Prevent opening xmllog on worker nodes (xdist).
     if xmlpath and not hasattr(config, "workerinput"):
         junit_family = config.getini("junit_family")
-        config._store[xml_key] = LogXML(
+        config.stash[xml_key] = LogXML(
             xmlpath,
             config.option.junitprefix,
             config.getini("junit_suite_name"),
@@ -437,13 +437,13 @@ def pytest_configure(config: Config) -> None:
             junit_family,
             config.getini("junit_log_passing_tests"),
         )
-        config.pluginmanager.register(config._store[xml_key])
+        config.pluginmanager.register(config.stash[xml_key])
 
 
 def pytest_unconfigure(config: Config) -> None:
-    xml = config._store.get(xml_key, None)
+    xml = config.stash.get(xml_key, None)
     if xml:
-        del config._store[xml_key]
+        del config.stash[xml_key]
         config.pluginmanager.unregister(xml)
 
 

src/_pytest/logging.py

@@ -31,15 +31,15 @@
 from _pytest.fixtures import fixture
 from _pytest.fixtures import FixtureRequest
 from _pytest.main import Session
-from _pytest.store import StoreKey
+from _pytest.stash import StashKey
 from _pytest.terminal import TerminalReporter
 
 
 DEFAULT_LOG_FORMAT = "%(levelname)-8s %(name)s:%(filename)s:%(lineno)d %(message)s"
 DEFAULT_LOG_DATE_FORMAT = "%H:%M:%S"
 _ANSI_ESCAPE_SEQ = re.compile(r"\x1b\[[\d;]+m")
-caplog_handler_key = StoreKey["LogCaptureHandler"]()
-caplog_records_key = StoreKey[Dict[str, List[logging.LogRecord]]]()
+caplog_handler_key = StashKey["LogCaptureHandler"]()
+caplog_records_key = StashKey[Dict[str, List[logging.LogRecord]]]()
 
 
 def _remove_ansi_escape_sequences(text: str) -> str:
@@ -372,7 +372,7 @@ def handler(self) -> LogCaptureHandler:
 
         :rtype: LogCaptureHandler
         """
-        return self._item._store[caplog_handler_key]
+        return self._item.stash[caplog_handler_key]
 
     def get_records(self, when: str) -> List[logging.LogRecord]:
         """Get the logging records for one of the possible test phases.
@@ -385,7 +385,7 @@ def get_records(self, when: str) -> List[logging.LogRecord]:
 
         .. versionadded:: 3.4
         """
-        return self._item._store[caplog_records_key].get(when, [])
+        return self._item.stash[caplog_records_key].get(when, [])
 
     @property
     def text(self) -> str:
@@ -694,8 +694,8 @@ def _runtest_for(self, item: nodes.Item, when: str) -> Generator[None, None, Non
         ) as report_handler:
             caplog_handler.reset()
             report_handler.reset()
-            item._store[caplog_records_key][when] = caplog_handler.records
-            item._store[caplog_handler_key] = caplog_handler
+            item.stash[caplog_records_key][when] = caplog_handler.records
+            item.stash[caplog_handler_key] = caplog_handler
 
             yield
 
@@ -707,7 +707,7 @@ def pytest_runtest_setup(self, item: nodes.Item) -> Generator[None, None, None]:
         self.log_cli_handler.set_when("setup")
 
         empty: Dict[str, List[logging.LogRecord]] = {}
-        item._store[caplog_records_key] = empty
+        item.stash[caplog_records_key] = empty
         yield from self._runtest_for(item, "setup")
 
     @hookimpl(hookwrapper=True)
@@ -721,8 +721,8 @@ def pytest_runtest_teardown(self, item: nodes.Item) -> Generator[None, None, Non
         self.log_cli_handler.set_when("teardown")
 
         yield from self._runtest_for(item, "teardown")
-        del item._store[caplog_records_key]
-        del item._store[caplog_handler_key]
+        del item.stash[caplog_records_key]
+        del item.stash[caplog_handler_key]
 
     @hookimpl
     def pytest_runtest_logfinish(self) -> None: