Use threading

master
clerie 7 months ago
parent 9fb1d81652
commit eae785064e
  1. 92
      scraper/daily_import_climate.py

@ -6,24 +6,65 @@ import io
import zipfile
import datetime
from config.db import db as config_db
import threading
class DwdScraper:
def __init__(self, worker=1):
self._worker = worker
self._tasks = {}
self._request_new_task = threading.Event()
self._close = True
def run(self):
last_station = self.get_station_to_update()
print("checking station", last_station)
for n in range(self._worker):
threading.Thread(target=self._run_scraper, kwargs={"id": n}, daemon=True).start()
while self._close:
self._request_new_task.wait()
self._request_new_task.clear()
print("Checking for waiting workers")
for id, t in list(self._tasks.items()):
if t["dwd_id"] is None:
print("Worker {} needs a job".format(id))
dwd_id = self.get_station_to_update()
if dwd_id is not None:
print("Worker {} got {}".format(id, dwd_id))
self._tasks[id]["dwd_id"] = dwd_id
self._tasks[id]["wait_for_dwd_id"].set()
def _run_scraper(self, id):
print("Worker {} spawned".format(id))
while self._close:
self._tasks[id] = {
"wait_for_dwd_id": threading.Event(),
"dwd_id": None
}
self._request_new_task.set()
print(id, "Waits for new task")
self._tasks[id]["wait_for_dwd_id"].wait()
print(id, "Got task {}".format(self._tasks[id]["dwd_id"]))
self._do_scrape(self._tasks[id]["dwd_id"])
def _do_scrape(self, dwd_id):
last_station = dwd_id
print(last_station)
r = requests.get('https://opendata.dwd.de/climate_environment/CDC/observations_germany/climate/daily/kl/recent/tageswerte_KL_' + str(last_station) + '_akt.zip', stream=True)
print(r.url)
if r.status_code != 200:
return
print(dwd_id, "downloaded file")
r.raise_for_status()
zip = zipfile.ZipFile(io.BytesIO(r.content))
files = zip.namelist()
print(files)
files_climate = [f for f in files if f.startswith("produkt_klima_")]
print(files_climate)
with psycopg2.connect(config_db["uri"]) as conn:
with conn.cursor() as cur:
@ -36,12 +77,16 @@ class DwdScraper:
is_first_line = True
count = 0
for line in zip.open(files_climate[0]):
l = line.decode('utf-8').strip()
if is_first_line:
is_first_line = False
continue
count += 1
b = {}
b["dwd_id"], l = l.strip().split(";", 1)
@ -82,20 +127,22 @@ class DwdScraper:
b["tgk"], l = l.strip().split(";", 1)
b["tgk"] = self.cleanup_value(float(b["tgk"]))
#print(b)
print(curr_station_id, b["date"].isoformat())
cur.execute("SELECT id FROM climate WHERE station = %s AND date = %s; ", [curr_station_id, b["date"].isoformat()])
if cur.rowcount == 0:
cur.execute("INSERT INTO climate (station, date, qn_3, fx, fm, qn_4, rsk, rskf, sdk, shk_tag, nm, vpm, pm, tmk, upm, txk, tnk, tgk) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s);",
[curr_station_id, b["date"].isoformat(), b["qn_3"], b["fx"], b["fm"], b["qn_4"], b["rsk"], b["rskf"], b["sdk"], b["shk_tag"], b["nm"], b["vpm"], b["pm"], b["tmk"], b["upm"], b["txk"], b["tnk"], b["tgk"]])
print("imported")
else:
print("ignored")
if count % 20 == 0:
print(dwd_id, "still updating")
print(dwd_id, "finished import")
cur.execute("UPDATE stations SET dwd_last_update = %s WHERE dwd_id = %s;", [datetime.datetime.today().isoformat(), last_station])
conn.commit()
print(dwd_id, "updated last change data")
def get_station_to_update(self):
"""
Returns DWD ID of station that should get updated soon.
@ -104,16 +151,17 @@ class DwdScraper:
with psycopg2.connect(config_db["uri"]) as conn:
with conn.cursor() as cur:
cur.execute("SELECT min(dwd_last_update) FROM stations;")
last_date = cur.fetchall()[0][0]
cur.execute("SELECT dwd_id FROM stations ORDER BY dwd_last_update ASC LIMIT %s", [self._worker + 1])
stations = cur.fetchall()
#print(stations)
if not last_date is None:
cur.execute("SELECT id, name, lat, lon, dwd_id, dwd_last_update FROM stations WHERE dwd_last_update = %s LIMIT 1;", [last_date])
else:
cur.execute("SELECT id, name, lat, lon, dwd_id, dwd_last_update FROM stations WHERE dwd_last_update IS NULL LIMIT 1;")
last_station = cur.fetchone()
for station in stations:
if station[0] not in [t["dwd_id"] for id, t in self._tasks.items()]:
return station[0]
return last_station[4]
return None
def cleanup_value(self, v):
if int(v) == -999:
@ -122,4 +170,4 @@ class DwdScraper:
return v
if __name__ == "__main__":
DwdScraper().run()
DwdScraper(worker=8).run()

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