[tor-bugs] #19791 [Metrics/metrics-lib]: Use CollecTor's index.json for download; adapt current download to use new date format

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#19791: Use CollecTor's index.json for download; adapt current download to use new
date format
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 Reporter:  karsten              |          Owner:  iwakeh
     Type:  defect               |         Status:  needs_review
 Priority:  High                 |      Milestone:  metrics-lib 1.4.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by iwakeh):

 * status:  assigned => needs_review


Comment:

 Please review [https://gitweb.torproject.org/user/iwakeh/metrics-
 lib.git/?h=task-19791-use-index.json this branch] (the four commits on top
 of slf4j).

 There are also many tests now and coverage is reasonably high everywhere
 regarding new classes.

 Please review carefully as I couldn't base the implementation on existing
 tests.

 Setting
 `-Ddescriptor.collector=org.torproject.descriptor.index.DescriptorIndexCollector`
 will use the new descriptor collector method.  Without the property
 setting the old method is used.

 The json implementation is encapsulated in IndexNode. One test reads and
 writes a current index.json from the main CollecTor instance (see
 test.json in test/resources).  The various compression methods are
 contained in FileType, where it is easy to add more in future, if
 necessary.

 This json writing/reading will be used in the next CollecTor, too.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19791#comment:9>
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