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