You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.3 KiB
82 lines
2.3 KiB
5 years ago
|
# pylint: skip-file
|
||
|
|
|
||
|
|
import os
|
||
|
|
import pycurl
|
||
|
|
from tools.lib.url_file import URLFile
|
||
|
|
from io import BytesIO
|
||
|
|
from tenacity import retry, wait_random_exponential, stop_after_attempt
|
||
|
|
|
||
|
|
from multiprocessing import Pool
|
||
|
|
|
||
|
|
|
||
|
|
class URLFileParallel(URLFile):
|
||
|
|
def __init__(self, url, debug=False):
|
||
|
|
self._length = None
|
||
|
|
self._url = url
|
||
|
|
self._pos = 0
|
||
|
|
self._local_file = None
|
||
|
|
|
||
|
|
def get_curl(self):
|
||
|
|
curl = pycurl.Curl()
|
||
|
|
curl.setopt(pycurl.NOSIGNAL, 1)
|
||
|
|
curl.setopt(pycurl.TIMEOUT_MS, 500000)
|
||
|
|
curl.setopt(pycurl.FOLLOWLOCATION, True)
|
||
|
|
return curl
|
||
|
|
|
||
|
|
@retry(wait=wait_random_exponential(multiplier=1, max=5), stop=stop_after_attempt(3), reraise=True)
|
||
|
|
def get_length(self):
|
||
|
|
if self._length is not None:
|
||
|
|
return self._length
|
||
|
|
|
||
|
|
c = self.get_curl()
|
||
|
|
c.setopt(pycurl.URL, self._url)
|
||
|
|
c.setopt(c.NOBODY, 1)
|
||
|
|
c.perform()
|
||
|
|
|
||
|
|
length = int(c.getinfo(c.CONTENT_LENGTH_DOWNLOAD))
|
||
|
|
self._length = length
|
||
|
|
return length
|
||
|
|
|
||
|
|
@retry(wait=wait_random_exponential(multiplier=1, max=5), stop=stop_after_attempt(3), reraise=True)
|
||
|
|
def download_chunk(self, start, end=None):
|
||
|
|
if end is None:
|
||
|
|
trange = f'bytes={start}-'
|
||
|
|
else:
|
||
|
|
trange = f'bytes={start}-{end}'
|
||
|
|
|
||
|
|
dats = BytesIO()
|
||
|
|
c = self.get_curl()
|
||
|
|
c.setopt(pycurl.URL, self._url)
|
||
|
|
c.setopt(pycurl.WRITEDATA, dats)
|
||
|
|
c.setopt(pycurl.HTTPHEADER, ["Range: " + trange, "Connection: keep-alive"])
|
||
|
|
c.perform()
|
||
|
|
|
||
|
|
response_code = c.getinfo(pycurl.RESPONSE_CODE)
|
||
|
|
if response_code != 206 and response_code != 200:
|
||
|
|
raise Exception("Error {} ({}): {}".format(response_code, self._url, repr(dats.getvalue())[:500]))
|
||
|
|
|
||
|
|
return dats.getvalue()
|
||
|
|
|
||
|
|
def read(self, ll=None):
|
||
|
|
start = self._pos
|
||
|
|
end = None if ll is None else self._pos + ll - 1
|
||
|
|
max_threads = int(os.environ.get("COMMA_PARALLEL_DOWNLOADS", "0"))
|
||
|
|
|
||
|
|
end = self.get_length() if end is None else end
|
||
|
|
threads = min((end - start) // (512 * 1024), max_threads) # At least 512k per thread
|
||
|
|
|
||
|
|
if threads > 1:
|
||
|
|
chunk_size = (end - start) // threads
|
||
|
|
chunks = [
|
||
|
|
(start + chunk_size * i,
|
||
|
|
start + chunk_size * (i + 1) - 1 if i != threads - 1 else end)
|
||
|
|
for i in range(threads)]
|
||
|
|
|
||
|
|
with Pool(threads) as pool:
|
||
|
|
ret = b"".join(pool.starmap(self.download_chunk, chunks))
|
||
|
|
else:
|
||
|
|
ret = self.download_chunk(start, end)
|
||
|
|
|
||
|
|
self._pos += len(ret)
|
||
|
|
return ret
|