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fetcher.py
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fetcher.py
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import asyncio
from urllib.request import urlretrieve
import xarray as xr
import copernicusmarine
import pytz
import yaml
from datetime import datetime, timedelta
import os
import atexit
import data_request as dr
def rm_grib_files(file_name: str):
"""
hook function that gets registered after each downloaded grib file to ensure that after the program ends
there are no residual files left (grib files and corresponding .idx files)
:param file_name: a name of a grib file to be removed after program exit
:return:
"""
try:
files = os.listdir(".")
for f in files:
if file_name in f:
os.remove(f)
except FileNotFoundError:
return
class Fetcher:
"""
The class is responsible for fetching and processing data from external weather sources.
"""
def __init__(self, request):
self.currents = None
self.tide = None
if isinstance(request, dr.DataRequest):
self.__request = request
else:
raise print("argument is not valid data request")
with open("config.yaml", "r") as f:
config = yaml.safe_load(f)
self.USERNAME = config["coppernicus_acount"]["username"]
self.PASSWORD = config["coppernicus_acount"]["password"]
@staticmethod
def map_hour(hour):
"""
map provided hour to the closest correct forecast hour (00,06,12,18)
:param hour: float or int
:return:
"""
forecast_hours = {(0, 5): "00", (6, 11): "06",
(12, 17): "12", (18, 23): "18"}
for key in forecast_hours:
if key[0] <= hour <= key[1]:
return forecast_hours[key]
@staticmethod
def curr_map_hour(hour):
"""
map provided hour to the closest correct forecast hour (00,06,12,18)
:param hour: float or int
:return:
"""
forecast_hours = {(0, 5): 0, (6, 11): 6,
(12, 17): 12, (18, 23): 18}
for key in forecast_hours:
if key[0] <= hour <= key[1]:
return forecast_hours[key]
@staticmethod
def curr_map_later_date(date):
"""
map provided hour to the closest correct forecast hour (00,06,12,18)
:param date: datetime
:return:
"""
map_date = date
forecast_hours = {(0, 5): 6, (6, 11): 12,
(12, 17): 18, (18, 23): 0}
for key in forecast_hours:
if key[0] <= date.hour <= key[1]:
map_date = map_date.replace(hour=forecast_hours[key])
if forecast_hours[key] == 0:
map_date = map_date + timedelta(days=1)
return map_date
def run_currents_task(self, data_request):
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
loop.run_until_complete(self.fetch_currents_async(data_request))
loop.close()
async def fetch_currents_async(self, data_request):
time_start, time_end = data_request["time"][0].astimezone(pytz.timezone('UTC')).replace(tzinfo=None), \
data_request["time"][1].astimezone(
pytz.timezone('UTC')).replace(tzinfo=None)
time_start = time_start.replace(hour=self.curr_map_hour(data_request["time"][0].hour))
time_end = self.curr_map_later_date(time_end)
self.currents = copernicusmarine.open_dataset(
dataset_id=data_request["dataset_id"],
minimum_longitude=data_request["longitude"][0],
maximum_longitude=data_request["longitude"][1],
minimum_latitude=data_request["latitude"][0],
maximum_latitude=data_request["latitude"][1],
start_datetime=time_start,
end_datetime=time_end,
variables=data_request["variables"], username=self.USERNAME, password=self.PASSWORD)
def fetch_currents(self):
"""
send request to copernicus service for currents data
:return: xarray dataset
"""
data_request = self.__request.parse_for_copernicus_currents()
self.run_currents_task(data_request)
return self.currents
def run_tide_task(self, data_request):
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
loop.run_until_complete(self.fetch_tide_async(data_request))
loop.close()
async def fetch_tide_async(self, data_request):
time_start = data_request["time"][0]
time_end = data_request["time"][1]
time_start, time_end = time_start.astimezone(pytz.timezone('UTC')).replace(tzinfo=None), time_end.astimezone(
pytz.timezone('UTC')).replace(tzinfo=None)
self.tide = copernicusmarine.open_dataset(
dataset_id=data_request["dataset_id"],
minimum_longitude=data_request["longitude"][0],
maximum_longitude=data_request["longitude"][1],
minimum_latitude=data_request["latitude"][0],
maximum_latitude=data_request["latitude"][1],
start_datetime=time_start,
end_datetime=time_end,
variables=data_request["variables"], username=self.USERNAME, password=self.PASSWORD)
def fetch_tide(self):
"""
send request to copernicus service for tide data
:return: xarray dataset
"""
data_request = self.__request.parse_for_copernicus_tide()
self.run_tide_task(data_request)
return self.tide
def fetch_wave_and_wind(self):
"""
Fetch wave and wind data from NOAA and process it for further use.
:return: Processed wave and wind data.
"""
now = datetime.now().astimezone(pytz.timezone('UTC'))
res = {}
time_start, time_end = self.__request.get_time()
time_start, time_end = time_start.astimezone(pytz.timezone('UTC')), time_end.astimezone(
pytz.timezone('UTC'))
forecast_time = time_start
i = 0
j = 0
time_data = []
forecast_hour = None
while forecast_time <= time_end:
if forecast_time <= now:
forecast_hour = self.map_hour(forecast_time.hour)
j = forecast_time.hour % 6
h = '{:03d}'.format(j)
url = (
"https://nomads.ncep.noaa.gov/cgi-bin/filter_gfswave.pl?dir=%2Fgfs." +
forecast_time.strftime("%Y%m%d") + "%2F" + forecast_hour + "%2Fwave%2Fgridded&file="
"gfswave.t" + forecast_hour +
"z.global.0p25.f" + h + ".grib2" + self.__request.parse_for_noaa()
)
else:
h = '{:03d}'.format(j)
forecast_hour = self.map_hour(now.hour)
url = (
"https://nomads.ncep.noaa.gov/cgi-bin/filter_gfswave.pl?dir=%2Fgfs." +
now.strftime("%Y%m%d") + "%2F" + forecast_hour + "%2Fwave%2Fgridded&file="
"gfswave.t" + forecast_hour +
"z.global.0p25.f" + h + ".grib2" + self.__request.parse_for_noaa()
)
filename = "ww" + forecast_time.strftime("%Y%m%d") + forecast_hour + str(j) + ".grib2"
atexit.register(rm_grib_files, filename)
try:
urlretrieve(url, filename)
wave_unproccessed = xr.load_dataset(filename, engine='cfgrib')
res["longitude"] = wave_unproccessed["longitude"].values.tolist()
res["latitude"] = wave_unproccessed["latitude"].values.tolist()
t = wave_unproccessed["time"].values
t = int(t.astype('datetime64[s]').astype('int64'))
t = t + 3600 * j
time_data.append(t)
j = j + 1
for v in wave_unproccessed:
if v in res:
res[v].append(wave_unproccessed[v].values.tolist())
else:
res[v] = []
res[v].append(wave_unproccessed[v].values.tolist())
except Exception as e:
print(str(e))
i = i + 1
forecast_time = forecast_time + timedelta(hours=1)
res["time"] = []
for e in time_data:
res["time"].append(e)
return res
def fetch(self) -> dict[str, dict]:
"""
fetch relevant data based on the DataRequest provided in the constructor
:return: a dict structured like:
- waves_and_wind : dict with waves and wind data from noaa
- tides : dict with tides data from copernicus
- currents : dict with currents data from copernicus
"""
waves_and_wind, tides, currents = None, None, None
res = {}
print("Fetching data...")
if len(self.__request.noaa_variables) > 0:
waves_and_wind = self.fetch_wave_and_wind()
res["waves_and_wind"] = waves_and_wind
res["copernicus"] = {}
if len(self.__request.tide_variables) > 0:
tides = self.fetch_tide().to_dict()
res["copernicus"]["tides"] = tides
if self.__request.currents_variables != [[], []]:
currents = self.fetch_currents().to_dict()
res["copernicus"]["currents"] = currents
print("Fetching finished")
return res