[tor-bugs] #30106 [Core Tor/Stem]: Unable to download server descriptors in stem 1.7

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#30106: Unable to download server descriptors in stem 1.7
-------------------------------+-------------------------------
 Reporter:  cypherpunks        |          Owner:  atagar
     Type:  defect             |         Status:  new
 Priority:  High               |      Component:  Core Tor/Stem
  Version:  sbws: unspecified  |       Severity:  Major
 Keywords:  descriptor         |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+-------------------------------
 Using the following code to get tor server descriptors works with stem
 1.6, but fails with stem 1.7.


 {{{
 /tmp/stemtest$ cat stem_break.py
 import stem.descriptor.remote
 downloader = stem.descriptor.remote.DescriptorDownloader(
             use_mirrors=True,
             timeout=30,
         )
 desc = list(downloader.get_server_descriptors())
 print(f'Got {len(desc)} tor descriptors')
 }}}

 {{{
 /tmp/stemtest$ python -m pip install
 "stem<1.7"
 Collecting stem<1.7
 Installing collected packages: stem
 Successfully installed stem-1.6.0
 /tmp/stemtest$ python stem_break.py
 Got 7387 tor descriptors
 }}}

 But using stem 1.7 this fails

 {{{
 /tmp/stemtest$ python stem_break.py
 Traceback (most recent call last):
   File "stem_break.py", line 6, in <module>
     desc = list(downloader.get_server_descriptors())
   File "/home/newp/.pyenv/versions/stemtest/lib/python3.7/site-
 packages/stem/descriptor/remote.py", line 630, in get_server_descriptors
     return self.query(resource, **query_args)
   File "/home/newp/.pyenv/versions/stemtest/lib/python3.7/site-
 packages/stem/descriptor/remote.py", line 811, in query
     return Query(resource, **args)
   File "/home/newp/.pyenv/versions/stemtest/lib/python3.7/site-
 packages/stem/descriptor/remote.py", line 375, in __init__
     self.endpoints.append(stem.DirPort(endpoint[0], endpoint[1]))  # TODO:
 remove this in stem 2.0
   File "/home/newp/.pyenv/versions/stemtest/lib/python3.7/site-
 packages/stem/__init__.py", line 571, in __init__
     raise ValueError("'%s' isn't a valid port" % port)
 ValueError: 'None' isn't a valid port
 }}}

 There do not appear to be references to get_server_descriptors function
 changing in the 1.7 changelog.  The environment is python 3.7.1 x64 using
 ubuntu 18.04.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30106>
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