[tor-bugs] #22836 [Metrics/Website]: Parse CollecTor's index.json and provide our own directory listing

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Mon Sep 18 17:10:58 UTC 2017

#22836: Parse CollecTor's index.json and provide our own directory listing
 Reporter:  karsten          |          Owner:  karsten
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:
Component:  Metrics/Website  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:

Comment (by iwakeh):

 I cannot find a test for `static List<String[]> formatTableEntries`, did
 you forget a commit?
 The waiting time shouldn't be extended unnecessarily:
 -  } while (System.currentTimeMillis() < waitingSinceMillis + 10000L);
 +  } while (null == this.index
 +      && System.currentTimeMillis() < waitingSinceMillis + 10000L);

 In addition, it might be safer and shorter to simply use `AtomicReference`
 instead of the synchronized methods.
 Actually, I was hinting for a separate DirectoryListing class (in
 comment:14), but separating the retrieval of the index is important, too.
 The separation you provided made it easy to introduce a
 `CollectorDirectoryProvider`, which fetches and provides the index incl.
 the suggested use of `AtomicReference` and the second while-condition.
 DirectoryListing is a `Map<String, List<String[]>>` and encapsulates the
 conversion from Index* to lists of strings.  `CollectorDirectoryProvider`
 only manages the scheduler and handing out the index.

 Another test `testListing` needs close inspection; it uses a fantasy
 index.json and checks the resulting map.

 Please, review the commit on top of
 web.git/commit/?h=task-22836 this branch].

 (I didn't change the byte-calculations, b/c they are only 'optics' and the
 compiler will make sure that a constant is created for the

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22836#comment:17>
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