[metrics-bugs] #20695 [Metrics/CollecTor]: handle json reading exception instead of escalating

[Tor Bug Tracker & Wiki]

#20695: handle json reading exception instead of escalating
-----------------------------------+--------------------------
     Reporter:  iwakeh             |      Owner:  metrics-team
         Type:  defect             |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
-----------------------------------+--------------------------
 tom ritter reported this error on the
 [https://lists.torproject.org/pipermail/metrics-
 team/2016-November/000235.html metrics-list].

 {{{
 V, 2016-11-16 16:00:00, 7818/7819 S (100.0%), 7815/7815 E (100.0%)
 V, 2016-11-16 16:00:00, 7784/7785 S (100.0%), 7781/7781 E (100.0%)
 V, 2016-11-16 16:00:00, 7782/7783 S (100.0%), 7778/7779 E (100.0%)
 C, 2016-11-16 16:00:00, 8/8 V (100.0%), 7127/7128 S (100.0%),
 7125/7125 E (100.0%)
 M, 2016-11-16 16:00:00, 7128/7128 M (100.0%)
 2016-11-16 16:06:15,696 ERROR o.t.c.c.CollecTorMain:71 The relaydescs
 module failed: com.google.gson.stream.MalformedJsonException: Use
 JsonReader.setLenient(true) to accept malformed JSON at line 1 column
 17791699
 com.google.gson.JsonSyntaxException:
 com.google.gson.stream.MalformedJsonException: Use
 JsonReader.setLenient(true) to accept malformed JSON at line 1 column
 17791699
     at com.google.gson.Gson.assertFullConsumption(Gson.java:779)
 ~[collector-1.1.0.jar:1.1.0-d9e32d5]
     at com.google.gson.Gson.fromJson(Gson.java:742)
 ~[collector-1.1.0.jar:1.1.0-d9e32d5]
     at
 org.torproject.collector.relaydescs.ReferenceChecker.readReferencesFile(ReferenceChecker.java:145)
 ~[collector-1.1.0.jar:1.1.0-d9e32d5]
     at
 org.torproject.collector.relaydescs.ReferenceChecker.check(ReferenceChecker.java:84)
 ~[collector-1.1.0.jar:1.1.0-d9e32d5]
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20695>
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