
# -*- coding: utf-8 -*-
"""
This module is meant to run JupyterLab in a headless browser, making sure
the application launches and starts up without errors.
"""
import asyncio
from concurrent.futures import ThreadPoolExecutor
import inspect
import logging
from os import path as osp
import os
import shutil
import sys
import time

from tornado.ioloop import IOLoop
from tornado.iostream import StreamClosedError
from tornado.websocket import WebSocketClosedError

from notebook.notebookapp import flags, aliases
from notebook.utils import urljoin, pathname2url
from traitlets import Bool

from .labapp import LabApp, get_app_dir
from .tests.test_app import TestEnv


here = osp.abspath(osp.dirname(__file__))
test_flags = dict(flags)
test_flags['core-mode'] = (
    {'BrowserApp': {'core_mode': True}},
    "Start the app in core mode."
)
test_flags['dev-mode'] = (
    {'BrowserApp': {'dev_mode': True}},
    "Start the app in dev mode."
)
test_flags['watch'] = (
    {'BrowserApp': {'watch': True}},
    "Start the app in watch mode."
)

test_aliases = dict(aliases)
test_aliases['app-dir'] = 'BrowserApp.app_dir'


class LogErrorHandler(logging.Handler):
    """A handler that exits with 1 on a logged error."""

    def __init__(self):
        super().__init__(level=logging.ERROR)
        self.errored = False

    def filter(self, record):
        # Handle known StreamClosedError from Tornado
        # These occur when we forcibly close Websockets or
        # browser connections during the test.
        # https://github.com/tornadoweb/tornado/issues/2834
        if hasattr(record, 'exc_info') and not record.exc_info is None and isinstance(record.exc_info[1], (StreamClosedError, WebSocketClosedError)):
            return
        return super().filter(record)

    def emit(self, record):
        print(record.msg, file=sys.stderr)
        self.errored = True


def run_test(app, func):
    """Synchronous entry point to run a test function.

    func is a function that accepts an app url as a parameter and returns a result.

    func can be synchronous or asynchronous.  If it is synchronous, it will be run
    in a thread, so asynchronous is preferred.
    """
    IOLoop.current().spawn_callback(run_test_async, app, func)


async def run_test_async(app, func):
    """Run a test against the application.

    func is a function that accepts an app url as a parameter and returns a result.

    func can be synchronous or asynchronous.  If it is synchronous, it will be run
    in a thread, so asynchronous is preferred.
    """
    handler = LogErrorHandler()
    app.log.addHandler(handler)

    env_patch = TestEnv()
    env_patch.start()

    # The entry URL for browser tests is different in notebook >= 6.0,
    # since that uses a local HTML file to point the user at the app.
    if hasattr(app, 'browser_open_file'):
        url = urljoin('file:', pathname2url(app.browser_open_file))
    else:
        url = app.display_url

    # Allow a synchronous function to be passed in.
    if inspect.iscoroutinefunction(func):
        test = func(url)
    else:
        app.log.info('Using thread pool executor to run test')
        loop = asyncio.get_event_loop()
        executor = ThreadPoolExecutor()
        task = loop.run_in_executor(executor, func, url)
        test = asyncio.wait([task])

    try:
       await test
    except Exception as e:
        app.log.critical("Caught exception during the test:")
        app.log.error(str(e))

    app.log.info("Test Complete")

    result = 0
    if handler.errored:
        result = 1
        app.log.critical('Exiting with 1 due to errors')
    else:
        app.log.info('Exiting normally')

    app.log.info('Stopping server...')
    try:
        app.http_server.stop()
        app.io_loop.stop()
        env_patch.stop()
    except Exception as e:
        app.log.error(str(e))
        result = 1
    finally:
        time.sleep(2)
        os._exit(result)


async def run_async_process(cmd, **kwargs):
    """Run an asynchronous command"""
    proc = await asyncio.create_subprocess_exec(
            *cmd,
            **kwargs)

    return await proc.communicate()


async def run_browser(url):
    """Run the browser test and return an exit code.
    """
    target = osp.join(get_app_dir(), 'browser_test')
    if not osp.exists(osp.join(target, 'node_modules')):
        os.makedirs(target)
        await run_async_process(["jlpm", "init", "-y"], cwd=target)
        await run_async_process(["jlpm", "add", "puppeteer@^2"], cwd=target)
    shutil.copy(osp.join(here, 'chrome-test.js'), osp.join(target, 'chrome-test.js'))
    await run_async_process(["node", "chrome-test.js", url], cwd=target)


class BrowserApp(LabApp):
    """An app the launches JupyterLab and waits for it to start up, checking for
    JS console errors, JS errors, and Python logged errors.
    """
    open_browser = Bool(False)
    base_url = '/foo/'
    ip = '127.0.0.1'
    flags = test_flags
    aliases = test_aliases
    test_browser = Bool(True)

    def start(self):
        web_app = self.web_app
        self.kernel_manager.shutdown_wait_time = 1

        web_app.settings.setdefault('page_config_data', dict())
        web_app.settings['page_config_data']['browserTest'] = True
        web_app.settings['page_config_data']['buildAvailable'] = False
        func = run_browser if self.test_browser else lambda url: 0
        run_test(self, func)
        super().start()


if __name__ == '__main__':
    skip_option = "--no-chrome-test"
    if skip_option in sys.argv:
        BrowserApp.test_browser = False
        sys.argv.remove(skip_option)
    BrowserApp.launch_instance()

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Handle errors in async browser_check