hass-core/homeassistant/helpers/frame.py

"""Provide frame helper for finding the current frame context."""

from __future__ import annotations

import asyncio
from collections.abc import Callable
from dataclasses import dataclass
import functools
from functools import cached_property
import linecache
import logging
import sys
from types import FrameType
from typing import Any, cast

from homeassistant.core import async_get_hass_or_none
from homeassistant.exceptions import HomeAssistantError
from homeassistant.loader import async_suggest_report_issue

_LOGGER = logging.getLogger(__name__)

# Keep track of integrations already reported to prevent flooding
_REPORTED_INTEGRATIONS: set[str] = set()


@dataclass(kw_only=True)
class IntegrationFrame:
    """Integration frame container."""

    custom_integration: bool
    integration: str
    module: str | None
    relative_filename: str
    frame: FrameType

    @cached_property
    def line_number(self) -> int:
        """Return the line number of the frame."""
        return self.frame.f_lineno

    @cached_property
    def filename(self) -> str:
        """Return the filename of the frame."""
        return self.frame.f_code.co_filename

    @cached_property
    def line(self) -> str:
        """Return the line of the frame."""
        return (linecache.getline(self.filename, self.line_number) or "?").strip()


def get_integration_logger(fallback_name: str) -> logging.Logger:
    """Return a logger by checking the current integration frame.

    If Python is unable to access the sources files, the call stack frame
    will be missing information, so let's guard by requiring a fallback name.
    https://github.com/home-assistant/core/issues/24982
    """
    try:
        integration_frame = get_integration_frame()
    except MissingIntegrationFrame:
        return logging.getLogger(fallback_name)

    if integration_frame.custom_integration:
        logger_name = f"custom_components.{integration_frame.integration}"
    else:
        logger_name = f"homeassistant.components.{integration_frame.integration}"

    return logging.getLogger(logger_name)


def get_current_frame(depth: int = 0) -> FrameType:
    """Return the current frame."""
    # Add one to depth since get_current_frame is included
    return sys._getframe(depth + 1)  # noqa: SLF001


def get_integration_frame(exclude_integrations: set | None = None) -> IntegrationFrame:
    """Return the frame, integration and integration path of the current stack frame."""
    found_frame = None
    if not exclude_integrations:
        exclude_integrations = set()

    frame: FrameType | None = get_current_frame()
    while frame is not None:
        filename = frame.f_code.co_filename

        for path in ("custom_components/", "homeassistant/components/"):
            try:
                index = filename.index(path)
                start = index + len(path)
                end = filename.index("/", start)
                integration = filename[start:end]
                if integration not in exclude_integrations:
                    found_frame = frame

                break
            except ValueError:
                continue

        if found_frame is not None:
            break

        frame = frame.f_back

    if found_frame is None:
        raise MissingIntegrationFrame

    found_module: str | None = None
    for module, module_obj in dict(sys.modules).items():
        if not hasattr(module_obj, "__file__"):
            continue
        if module_obj.__file__ == found_frame.f_code.co_filename:
            found_module = module
            break

    return IntegrationFrame(
        custom_integration=path == "custom_components/",
        integration=integration,
        module=found_module,
        relative_filename=found_frame.f_code.co_filename[index:],
        frame=found_frame,
    )


class MissingIntegrationFrame(HomeAssistantError):
    """Raised when no integration is found in the frame."""


def report(
    what: str,
    exclude_integrations: set | None = None,
    error_if_core: bool = True,
    level: int = logging.WARNING,
    log_custom_component_only: bool = False,
    error_if_integration: bool = False,
) -> None:
    """Report incorrect usage.

    Async friendly.
    """
    try:
        integration_frame = get_integration_frame(
            exclude_integrations=exclude_integrations
        )
    except MissingIntegrationFrame as err:
        msg = f"Detected code that {what}. Please report this issue."
        if error_if_core:
            raise RuntimeError(msg) from err
        if not log_custom_component_only:
            _LOGGER.warning(msg, stack_info=True)
        return

    if (
        error_if_integration
        or not log_custom_component_only
        or integration_frame.custom_integration
    ):
        _report_integration(what, integration_frame, level, error_if_integration)


def _report_integration(
    what: str,
    integration_frame: IntegrationFrame,
    level: int = logging.WARNING,
    error: bool = False,
) -> None:
    """Report incorrect usage in an integration.

    Async friendly.
    """
    # Keep track of integrations already reported to prevent flooding
    key = f"{integration_frame.filename}:{integration_frame.line_number}"
    if not error and key in _REPORTED_INTEGRATIONS:
        return
    _REPORTED_INTEGRATIONS.add(key)

    report_issue = async_suggest_report_issue(
        async_get_hass_or_none(),
        integration_domain=integration_frame.integration,
        module=integration_frame.module,
    )
    integration_type = "custom " if integration_frame.custom_integration else ""
    _LOGGER.log(
        level,
        "Detected that %sintegration '%s' %s at %s, line %s: %s, please %s",
        integration_type,
        integration_frame.integration,
        what,
        integration_frame.relative_filename,
        integration_frame.line_number,
        integration_frame.line,
        report_issue,
    )
    if not error:
        return
    raise RuntimeError(
        f"Detected that {integration_type}integration "
        f"'{integration_frame.integration}' {what} at "
        f"{integration_frame.relative_filename}, line "
        f"{integration_frame.line_number}: {integration_frame.line}. "
        f"Please {report_issue}."
    )


def warn_use[_CallableT: Callable](func: _CallableT, what: str) -> _CallableT:
    """Mock a function to warn when it was about to be used."""
    if asyncio.iscoroutinefunction(func):

        @functools.wraps(func)
        async def report_use(*args: Any, **kwargs: Any) -> None:
            report(what)

    else:

        @functools.wraps(func)
        def report_use(*args: Any, **kwargs: Any) -> None:
            report(what)

    return cast(_CallableT, report_use)


def report_non_thread_safe_operation(what: str) -> None:
    """Report a non-thread safe operation."""
    report(
        f"calls {what} from a thread other than the event loop, "
        "which may cause Home Assistant to crash or data to corrupt. "
        "For more information, see "
        "https://developers.home-assistant.io/docs/asyncio_thread_safety/"
        f"#{what.replace('.', '')}",
        error_if_core=True,
        error_if_integration=True,
    )