authentik/e2e/utils.py

"""passbook e2e testing utilities"""
from functools import wraps
from glob import glob
from importlib.util import module_from_spec, spec_from_file_location
from inspect import getmembers, isfunction
from os import environ, makedirs
from time import sleep, time
from typing import Any, Callable, Dict, Optional

from django.apps import apps
from django.contrib.staticfiles.testing import StaticLiveServerTestCase
from django.db import connection, transaction
from django.db.utils import IntegrityError
from django.shortcuts import reverse
from django.test.testcases import TransactionTestCase
from docker import DockerClient, from_env
from docker.models.containers import Container
from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException, TimeoutException
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.remote.webdriver import WebDriver
from selenium.webdriver.support.ui import WebDriverWait
from structlog import get_logger

from passbook.core.models import User


# pylint: disable=invalid-name
def USER() -> User:  # noqa
    """Cached function that always returns pbadmin"""
    return User.objects.get(username="pbadmin")


class SeleniumTestCase(StaticLiveServerTestCase):
    """StaticLiveServerTestCase which automatically creates a Webdriver instance"""

    container: Optional[Container] = None

    def setUp(self):
        super().setUp()
        makedirs("selenium_screenshots/", exist_ok=True)
        self.driver = self._get_driver()
        self.driver.maximize_window()
        self.driver.implicitly_wait(30)
        self.wait = WebDriverWait(self.driver, 60)
        self.apply_default_data()
        self.logger = get_logger()
        if specs := self.get_container_specs():
            self.container = self._start_container(specs)

    def _start_container(self, specs: Dict[str, Any]) -> Container:
        client: DockerClient = from_env()
        client.images.pull(specs["image"])
        container = client.containers.run(**specs)
        if "healthcheck" not in specs:
            return container
        while True:
            container.reload()
            status = container.attrs.get("State", {}).get("Health", {}).get("Status")
            if status == "healthy":
                return container
            self.logger.info("Container failed healthcheck")
            sleep(1)

    def get_container_specs(self) -> Optional[Dict[str, Any]]:
        """Optionally get container specs which will launched on setup, wait for the container to
        be healthy, and deleted again on tearDown"""
        return None

    def _get_driver(self) -> WebDriver:
        return webdriver.Remote(
            command_executor="http://localhost:4444/wd/hub",
            desired_capabilities=DesiredCapabilities.CHROME,
        )

    def tearDown(self):
        if "TF_BUILD" in environ:
            screenshot_file = (
                f"selenium_screenshots/{self.__class__.__name__}_{time()}.png"
            )
            self.driver.save_screenshot(screenshot_file)
            self.logger.warning("Saved screenshot", file=screenshot_file)
        for line in self.driver.get_log("browser"):
            self.logger.warning(
                line["message"], source=line["source"], level=line["level"]
            )
        if self.container:
            self.container.kill()
        self.driver.quit()
        super().tearDown()

    def wait_for_url(self, desired_url):
        """Wait until URL is `desired_url`."""
        self.wait.until(
            lambda driver: driver.current_url == desired_url,
            f"URL {self.driver.current_url} doesn't match expected URL {desired_url}",
        )

    def url(self, view, **kwargs) -> str:
        """reverse `view` with `**kwargs` into full URL using live_server_url"""
        return self.live_server_url + reverse(view, kwargs=kwargs)

    def apply_default_data(self):
        """apply objects created by migrations after tables have been truncated"""
        # Find all migration files
        # load all functions
        migration_files = glob("**/migrations/*.py", recursive=True)
        matches = []
        for migration in migration_files:
            with open(migration, "r+") as migration_file:
                # Check if they have a `RunPython`
                if "RunPython" in migration_file.read():
                    matches.append(migration)

        with connection.schema_editor() as schema_editor:
            for match in matches:
                # Load module from file path
                spec = spec_from_file_location("", match)
                migration_module = module_from_spec(spec)
                # pyright: reportGeneralTypeIssues=false
                spec.loader.exec_module(migration_module)
                # Call all functions from module
                for _, func in getmembers(migration_module, isfunction):
                    with transaction.atomic():
                        try:
                            func(apps, schema_editor)
                        except IntegrityError:
                            pass


def retry(max_retires=3, exceptions=None):
    """Retry test multiple times. Default to catching Selenium Timeout Exception"""

    if not exceptions:
        exceptions = [TimeoutException, NoSuchElementException]

    logger = get_logger()

    def retry_actual(func: Callable):
        """Retry test multiple times"""
        count = 1

        @wraps(func)
        def wrapper(self: TransactionTestCase, *args, **kwargs):
            """Run test again if we're below max_retries, including tearDown and
            setUp. Otherwise raise the error"""
            nonlocal count
            try:
                return func(self, *args, **kwargs)
            # pylint: disable=catching-non-exception
            except tuple(exceptions) as exc:
                count += 1
                if count > max_retires:
                    logger.debug("Exceeded retry count", exc=exc, test=self)
                    # pylint: disable=raising-non-exception
                    raise exc
                logger.debug("Retrying on error", exc=exc, test=self)
                self.tearDown()
                self._post_teardown()
                self.setUp()
                return wrapper(self, *args, **kwargs)

        return wrapper

    return retry_actual