def crawl_history(direction: str, date=yesterday()):
assert direction in ["in", "out"]
city_code = get_city_codes()
total = len(city_code)
for i, city_record in enumerate(city_code):
time.sleep(SLEEP_SEC)
city_id = city_record["code"]
logger.info(f"[{i+1}/{total}]: {city_record['city']} ({city_id})")
query = (
"https://huiyan.baidu.com/migration/historycurve.jsonp" +
f"?dt=city&id={city_id}&type=move_{direction}&startDate=20200101&endDate={date}"
)
logger.info(f"Getting {query}")
res = requests.get(query)
if res.status_code == 200:
logger.info("Success.")
with open(FilepathMapper.history(city_id, direction),
"w",
encoding="utf-8") as f:
f.write(res.text)
else:
logger.warning(
f"Bad response code {res.status_code} for {city_record['city']}"
)
def update_history_if_outdated(direction, city_id):
path = FilepathMapper.history("110000", direction)
with open(path, "r", encoding="utf-8") as f:
res = f.read()
if yesterday() not in res:
logger.info("Obtaining the latest history data.")
crawl_history(direction)
def load_history(date, city_id):
update_history_if_outdated("in", city_id)
path = FilepathMapper.history(city_id, "in")
if os.path.exists(path):
logger.info(f"Reading <{city_id}> <{date}> history data")
with open(path, "r", encoding="utf-8") as f:
res = f.read()
return json.loads(res.split("(")[-1][:-1])["data"]["list"]
else:
return None