257 lines
8.4 KiB
Python
257 lines
8.4 KiB
Python
import asyncio
|
|
from enum import Enum, auto
|
|
from io import BytesIO
|
|
from math import ceil
|
|
import os.path
|
|
from shutil import rmtree
|
|
from time import perf_counter
|
|
from zipfile import ZipFile
|
|
import aiohttp
|
|
import urllib3
|
|
from PyQt5.QtCore import QThread, pyqtSignal
|
|
from constants import Constants, Database, ChecksumWhat
|
|
from utilities import checksum_ok
|
|
|
|
|
|
class ThreadStatus(Enum):
|
|
"""Possible thread status."""
|
|
|
|
OK = auto()
|
|
NO_CONNECTION_ERR = auto()
|
|
UNKNOWN_ERR = auto()
|
|
BAD_DOWNLOAD_ERR = auto()
|
|
UNDEFINED = auto()
|
|
SLOW_CONN_ERR = auto()
|
|
|
|
|
|
class SlowConnError(Exception):
|
|
pass
|
|
|
|
|
|
class BaseDownloadThread(QThread):
|
|
"""Subclass QThread. Base class for the download threads."""
|
|
|
|
def __init__(self, parent=None):
|
|
"""Set the status to 'UNDEFINED'."""
|
|
super().__init__(parent)
|
|
self.status = ThreadStatus.UNDEFINED
|
|
|
|
def __del__(self):
|
|
"""Force the termination of the thread."""
|
|
self.terminate()
|
|
self.wait()
|
|
|
|
|
|
class DownloadThread(BaseDownloadThread):
|
|
"""Subclass BaseDownloadThread. Download the database, images and audio samples."""
|
|
|
|
progress = pyqtSignal(int, float)
|
|
_CHUNK = 128 * 1024
|
|
_MEGA = 1024**2
|
|
|
|
def __init__(self):
|
|
"""Just call super().__init__."""
|
|
self._db = None
|
|
self._exit_call = False
|
|
super().__init__()
|
|
|
|
def _pretty_len(self, byte_obj):
|
|
"""Return a well-formatted number of downloaded MB."""
|
|
mega = len(byte_obj) / self._MEGA
|
|
if mega.is_integer():
|
|
return int(mega)
|
|
else:
|
|
return ceil(mega)
|
|
|
|
def _get_download_speed(self, data, delta):
|
|
"""Return the download speed in MB/s."""
|
|
return round(
|
|
(len(data) / self._MEGA) / delta, 2
|
|
)
|
|
|
|
def set_exit(self):
|
|
self._exit_call = True
|
|
|
|
def run(self):
|
|
"""Override QThread.run. Download the database, images and audio samples.
|
|
|
|
Handle all possible exceptions. Also extract the files
|
|
in the local folder."""
|
|
self.status = ThreadStatus.UNDEFINED
|
|
self._db = None
|
|
raw_data = bytes(0)
|
|
try:
|
|
self._db = urllib3.PoolManager().request(
|
|
'GET',
|
|
Database.LINK_LOC,
|
|
preload_content=False,
|
|
timeout=4.0
|
|
)
|
|
while True:
|
|
start = perf_counter()
|
|
try:
|
|
data = self._db.read(self._CHUNK)
|
|
except Exception:
|
|
raise SlowConnError
|
|
else:
|
|
delta = perf_counter() - start
|
|
if not data:
|
|
break
|
|
raw_data += data
|
|
self.progress.emit(
|
|
self._pretty_len(raw_data),
|
|
self._get_download_speed(data, delta)
|
|
)
|
|
if self._exit_call:
|
|
self._exit_call = False
|
|
self._db.release_conn()
|
|
return
|
|
except Exception as e: # No (or bad) internet connection.
|
|
self._db.release_conn()
|
|
if isinstance(e, SlowConnError):
|
|
self.status = ThreadStatus.SLOW_CONN_ERR
|
|
else:
|
|
self.status = ThreadStatus.NO_CONNECTION_ERR
|
|
return
|
|
if self._db.status != 200:
|
|
self.status = ThreadStatus.BAD_DOWNLOAD_ERR
|
|
return
|
|
try:
|
|
is_checksum_ok = checksum_ok(raw_data, ChecksumWhat.FOLDER)
|
|
except Exception: # checksum_ok unable to connect to the reference.
|
|
self.status = ThreadStatus.NO_CONNECTION_ERR
|
|
return
|
|
else:
|
|
if not is_checksum_ok:
|
|
self.status = ThreadStatus.BAD_DOWNLOAD_ERR
|
|
return
|
|
if os.path.exists(Constants.DATA_FOLDER):
|
|
rmtree(Constants.DATA_FOLDER)
|
|
try:
|
|
self.progress.emit(Constants.EXTRACTING_CODE, 0.0)
|
|
with ZipFile(BytesIO(raw_data)) as zipped:
|
|
zipped.extractall()
|
|
except Exception:
|
|
self.status = ThreadStatus.UNKNOWN_ERR
|
|
else:
|
|
self.status = ThreadStatus.OK
|
|
|
|
|
|
class _AsyncDownloader:
|
|
"""Mixin class for asynchronous threads."""
|
|
|
|
async def _download_resource(self, session, link):
|
|
"""Return the content of 'link' as bytes."""
|
|
resp = await session.get(link)
|
|
return await resp.read()
|
|
|
|
|
|
class UpdateSpaceWeatherThread(BaseDownloadThread, _AsyncDownloader):
|
|
"""Subclass BaseDownloadThread. Downlaod the space weather data."""
|
|
|
|
_PROPERTIES = ("xray", "prot_el", "ak_index", "sgas", "geo_storm")
|
|
|
|
def __init__(self, space_weather_data):
|
|
"""Initialize the a local space_weather_data."""
|
|
super().__init__()
|
|
self._space_weather_data = space_weather_data
|
|
|
|
async def _download_property(self, session, property_name):
|
|
"""Download the data conteining the information of a specific property."""
|
|
link = getattr(Constants, "SPACE_WEATHER_" + property_name.upper())
|
|
data = await self._download_resource(session, link)
|
|
setattr(self._space_weather_data, property_name, str(data, 'utf-8'))
|
|
|
|
async def _download_image(self, session, n):
|
|
"""Download the data corresponding the n-th image displayed in the screen."""
|
|
im = await self._download_resource(
|
|
session, Constants.SPACE_WEATHER_IMGS[n]
|
|
)
|
|
self._space_weather_data.images[n].loadFromData(im)
|
|
|
|
async def _download_resources(self):
|
|
"""Download all the data."""
|
|
session = aiohttp.ClientSession()
|
|
try:
|
|
t = []
|
|
for p in self._PROPERTIES:
|
|
t.append(
|
|
asyncio.create_task(self._download_property(session, p))
|
|
)
|
|
|
|
tot_images = range(len(Constants.SPACE_WEATHER_IMGS))
|
|
t1 = []
|
|
for im_number in tot_images:
|
|
t1.append(
|
|
asyncio.create_task(
|
|
self._download_image(session, im_number)
|
|
)
|
|
)
|
|
await asyncio.gather(*t, *t1)
|
|
except Exception:
|
|
self.status = ThreadStatus.UNKNOWN_ERR
|
|
else:
|
|
self.status = ThreadStatus.OK
|
|
finally:
|
|
await session.close()
|
|
|
|
def run(self):
|
|
"""Override QThread.run. Start the download of the data."""
|
|
self.status = ThreadStatus.UNDEFINED
|
|
asyncio.run(self._download_resources())
|
|
|
|
|
|
class UpdateForecastThread(BaseDownloadThread, _AsyncDownloader):
|
|
"""Subclass BaseDownloadThread. Download the forecast data."""
|
|
|
|
class _PropertyName(Enum):
|
|
"""Enum used to differentiate between the two data needed."""
|
|
FORECAST = auto()
|
|
PROBABILITIES = auto()
|
|
|
|
def __init__(self, owner):
|
|
"""Set the owner object (a ForecastData instance)."""
|
|
super().__init__()
|
|
self.owner = owner
|
|
|
|
async def _download_property(self, session, link, prop_name):
|
|
"""Download the data from 'link' and set the corresponding property of the owner."""
|
|
resp = await self._download_resource(session, link)
|
|
resp = str(resp, 'utf-8')
|
|
if prop_name is self._PropertyName.FORECAST:
|
|
self.owner.forecast = resp
|
|
if prop_name is self._PropertyName.PROBABILITIES:
|
|
self.owner.probabilities = resp
|
|
|
|
async def _download_resources(self):
|
|
"""Download all the data needed."""
|
|
session = aiohttp.ClientSession()
|
|
try:
|
|
await asyncio.gather(
|
|
asyncio.create_task(
|
|
self._download_property(
|
|
session,
|
|
Constants.SPACE_WEATHER_GEO_STORM,
|
|
self._PropertyName.FORECAST
|
|
)
|
|
),
|
|
asyncio.create_task(
|
|
self._download_property(
|
|
session,
|
|
Constants.FORECAST_PROBABILITIES,
|
|
self._PropertyName.PROBABILITIES
|
|
)
|
|
)
|
|
)
|
|
except Exception:
|
|
self.status = ThreadStatus.UNKNOWN_ERR
|
|
else:
|
|
self.status = ThreadStatus.OK
|
|
finally:
|
|
await session.close()
|
|
|
|
def run(self):
|
|
"""Override QThread.run. Start the data download."""
|
|
self.status = ThreadStatus.UNDEFINED
|
|
asyncio.run(self._download_resources())
|