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.
110 lines
2.9 KiB
110 lines
2.9 KiB
# pylint: skip-file
|
|
|
|
import os
|
|
import time
|
|
import tempfile
|
|
import threading
|
|
import urllib.parse
|
|
import pycurl
|
|
from io import BytesIO
|
|
from tenacity import retry, wait_random_exponential, stop_after_attempt
|
|
|
|
class URLFile(object):
|
|
_tlocal = threading.local()
|
|
|
|
def __init__(self, url, debug=False):
|
|
self._url = url
|
|
self._pos = 0
|
|
self._local_file = None
|
|
self._debug = debug
|
|
|
|
try:
|
|
self._curl = self._tlocal.curl
|
|
except AttributeError:
|
|
self._curl = self._tlocal.curl = pycurl.Curl()
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, type, value, traceback):
|
|
if self._local_file is not None:
|
|
os.remove(self._local_file.name)
|
|
self._local_file.close()
|
|
self._local_file = None
|
|
|
|
@retry(wait=wait_random_exponential(multiplier=1, max=5), stop=stop_after_attempt(3), reraise=True)
|
|
def read(self, ll=None):
|
|
if ll is None:
|
|
trange = 'bytes=%d-' % self._pos
|
|
else:
|
|
trange = 'bytes=%d-%d' % (self._pos, self._pos+ll-1)
|
|
|
|
dats = BytesIO()
|
|
c = self._curl
|
|
c.setopt(pycurl.URL, self._url)
|
|
c.setopt(pycurl.WRITEDATA, dats)
|
|
c.setopt(pycurl.NOSIGNAL, 1)
|
|
c.setopt(pycurl.TIMEOUT_MS, 500000)
|
|
c.setopt(pycurl.HTTPHEADER, ["Range: " + trange, "Connection: keep-alive"])
|
|
c.setopt(pycurl.FOLLOWLOCATION, True)
|
|
|
|
if self._debug:
|
|
print("downloading", self._url)
|
|
|
|
def header(x):
|
|
if b'MISS' in x:
|
|
print(x.strip())
|
|
|
|
c.setopt(pycurl.HEADERFUNCTION, header)
|
|
|
|
def test(debug_type, debug_msg):
|
|
print(" debug(%d): %s" % (debug_type, debug_msg.strip()))
|
|
|
|
c.setopt(pycurl.VERBOSE, 1)
|
|
c.setopt(pycurl.DEBUGFUNCTION, test)
|
|
t1 = time.time()
|
|
|
|
c.perform()
|
|
|
|
if self._debug:
|
|
t2 = time.time()
|
|
if t2-t1 > 0.1:
|
|
print("get %s %r %.f slow" % (self._url, trange, t2-t1))
|
|
|
|
response_code = c.getinfo(pycurl.RESPONSE_CODE)
|
|
if response_code == 416: # Requested Range Not Satisfiable
|
|
return ""
|
|
if response_code != 206 and response_code != 200:
|
|
raise Exception("Error {} ({}): {}".format(response_code, self._url, repr(dats.getvalue())[:500]))
|
|
|
|
|
|
ret = dats.getvalue()
|
|
self._pos += len(ret)
|
|
return ret
|
|
|
|
def seek(self, pos):
|
|
self._pos = pos
|
|
|
|
@property
|
|
def name(self):
|
|
"""Returns a local path to file with the URLFile's contents.
|
|
|
|
This can be used to interface with modules that require local files.
|
|
"""
|
|
if self._local_file is None:
|
|
_, ext = os.path.splitext(urllib.parse.urlparse(self._url).path)
|
|
local_fd, local_path = tempfile.mkstemp(suffix=ext)
|
|
try:
|
|
os.write(local_fd, self.read())
|
|
local_file = open(local_path, "rb")
|
|
except:
|
|
os.remove(local_path)
|
|
raise
|
|
finally:
|
|
os.close(local_fd)
|
|
|
|
self._local_file = local_file
|
|
self.read = self._local_file.read
|
|
self.seek = self._local_file.seek
|
|
|
|
return self._local_file.name
|
|
|