supervisor/supervisor/plugins/base.py

"""Supervisor plugins base class."""

from abc import ABC, abstractmethod
import asyncio
from collections.abc import Awaitable
from contextlib import suppress
import logging

from awesomeversion import AwesomeVersion, AwesomeVersionException

from ..const import ATTR_IMAGE, ATTR_VERSION, BusEvent
from ..coresys import CoreSysAttributes
from ..docker.const import ContainerState
from ..docker.interface import DockerInterface
from ..docker.monitor import DockerContainerStateEvent
from ..exceptions import DockerError, PluginError
from ..utils.common import FileConfiguration
from ..utils.sentry import async_capture_exception
from .const import WATCHDOG_MAX_ATTEMPTS, WATCHDOG_RETRY_SECONDS

_LOGGER: logging.Logger = logging.getLogger(__name__)


class PluginBase(ABC, FileConfiguration, CoreSysAttributes):
    """Base class for plugins."""

    slug: str
    instance: DockerInterface

    @property
    def version(self) -> AwesomeVersion | None:
        """Return current version of the plugin."""
        return self._data.get(ATTR_VERSION)

    @version.setter
    def version(self, value: AwesomeVersion) -> None:
        """Set current version of the plugin."""
        self._data[ATTR_VERSION] = value

    @property
    def default_image(self) -> str:
        """Return default image for plugin."""
        return f"ghcr.io/home-assistant/{self.sys_arch.supervisor}-hassio-{self.slug}"

    @property
    def image(self) -> str:
        """Return current image of plugin."""
        if self._data.get(ATTR_IMAGE):
            return self._data[ATTR_IMAGE]
        return self.default_image

    @image.setter
    def image(self, value: str) -> None:
        """Return current image of the plugin."""
        self._data[ATTR_IMAGE] = value

    @property
    @abstractmethod
    def latest_version(self) -> AwesomeVersion | None:
        """Return latest version of the plugin."""

    @property
    def need_update(self) -> bool:
        """Return True if an update is available."""
        try:
            return (
                self.version is not None
                and self.latest_version is not None
                and self.version < self.latest_version
            )
        except (AwesomeVersionException, TypeError):
            return False

    @property
    def in_progress(self) -> bool:
        """Return True if a task is in progress."""
        return self.instance.in_progress

    def logs(self) -> Awaitable[bytes]:
        """Get docker plugin logs.

        Return Coroutine.
        """
        return self.instance.logs()

    def is_running(self) -> Awaitable[bool]:
        """Return True if Docker container is running.

        Return a coroutine.
        """
        return self.instance.is_running()

    def is_failed(self) -> Awaitable[bool]:
        """Return True if a Docker container is failed state.

        Return a coroutine.
        """
        return self.instance.is_failed()

    def start_watchdog(self) -> None:
        """Register docker container listener for plugin."""
        self.sys_bus.register_event(
            BusEvent.DOCKER_CONTAINER_STATE_CHANGE, self.watchdog_container
        )

    async def watchdog_container(self, event: DockerContainerStateEvent) -> None:
        """Process state changes in plugin container and restart if necessary."""
        if event.name != self.instance.name:
            return

        if event.state in {ContainerState.FAILED, ContainerState.UNHEALTHY}:
            await self._restart_after_problem(event.state)

    async def _restart_after_problem(self, state: ContainerState):
        """Restart unhealthy or failed plugin."""
        attempts = 0
        while await self.instance.current_state() == state:
            if not self.in_progress:
                _LOGGER.warning(
                    "Watchdog found %s plugin %s, restarting...",
                    self.slug,
                    state,
                )
                try:
                    await self.rebuild()
                except PluginError as err:
                    attempts = attempts + 1
                    _LOGGER.error("Watchdog restart of %s plugin failed!", self.slug)
                    await async_capture_exception(err)
                else:
                    break

            if attempts >= WATCHDOG_MAX_ATTEMPTS:
                _LOGGER.critical(
                    "Watchdog cannot restart %s plugin, failed all %s attempts",
                    self.slug,
                    attempts,
                )
                break

            await asyncio.sleep(WATCHDOG_RETRY_SECONDS)

    async def rebuild(self) -> None:
        """Rebuild system plugin."""
        with suppress(DockerError):
            await self.instance.stop()
        await self.start()

    @abstractmethod
    async def start(self) -> None:
        """Start system plugin."""

    @abstractmethod
    async def stop(self) -> None:
        """Stop system plugin."""

    async def load(self) -> None:
        """Load system plugin."""
        self.start_watchdog()

        # Check plugin state
        try:
            # Evaluate Version if we lost this information
            if self.version:
                version = self.version
            else:
                self.version = version = await self.instance.get_latest_version()

            await self.instance.attach(version=version, skip_state_event_if_down=True)

            await self.instance.check_image(version, self.default_image)
        except DockerError:
            _LOGGER.info(
                "No %s plugin Docker image %s found.", self.slug, self.instance.image
            )

            # Install plugin
            with suppress(PluginError):
                await self.install()
        else:
            self.version = self.instance.version or version
            self.image = self.default_image
            await self.save_data()

        # Run plugin
        with suppress(PluginError):
            if not await self.instance.is_running():
                await self.start()

    async def install(self) -> None:
        """Install system plugin."""
        _LOGGER.info("Setup %s plugin", self.slug)
        while True:
            # read plugin tag and install it
            if not self.latest_version:
                await self.sys_updater.reload()

            if to_version := self.latest_version:
                with suppress(DockerError):
                    await self.instance.install(to_version, image=self.default_image)
                    self.version = self.instance.version or to_version
                    break
            _LOGGER.warning(
                "Error on installing %s plugin, retrying in 30sec", self.slug
            )
            await asyncio.sleep(30)

        _LOGGER.info("%s plugin now installed", self.slug)
        self.image = self.default_image
        await self.save_data()

    async def update(self, version: str | None = None) -> None:
        """Update system plugin."""
        to_version = AwesomeVersion(version) if version else self.latest_version
        if not to_version:
            raise PluginError(
                f"Cannot determine latest version of plugin {self.slug} for update",
                _LOGGER.error,
            )

        old_image = self.image

        if to_version == self.version:
            _LOGGER.warning(
                "Version %s is already installed for %s", to_version, self.slug
            )
            return

        await self.instance.update(to_version, image=self.default_image)
        self.version = self.instance.version or to_version
        self.image = self.default_image
        await self.save_data()

        # Cleanup
        with suppress(DockerError):
            await self.instance.cleanup(old_image=old_image)

        # Start plugin
        await self.start()

    @abstractmethod
    async def repair(self) -> None:
        """Repair system plugin."""