[tor-bugs] #14859 [Onionoo]: Adapt Onionoo's parsing code for MaxMind's GeoLite2 City files to their new format

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#14859: Adapt Onionoo's parsing code for MaxMind's GeoLite2 City files to their new
format
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     Reporter:  karsten  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:
    Component:  Onionoo  |    Version:
   Resolution:           |   Keywords:
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by iwakeh):

 Of course, you're right, this is not a test, but a run-time verification.

 Using {{{InputStreamReader(InputStream in, CharsetDecoder dec)}}} for
 reading the files
 will throw {{{CharacterCodingException}}}, e.g.
 {{{
  BufferedReader br = new BufferedReader(new InputStreamReader(
 new FileInputStream(this.geoLite2CityBlocksIPv4CsvFile),
 StandardCharsets.UTF_8.newDecoder));
 }}}
 The mentioned classes are from 'java.nio.charset'

 A {{{CharacterCodingException}}} could exit the run, or trigger a warning
 and
 use the current way of reading the file as fallback, which could lead to
 mangled
 output. Or, just not use the wrongly encoded file, like in the missing-
 geoip-case.

 The latter seems best to me.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14859#comment:6>
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