[tor-bugs] #11577 [Onionoo]: Use Gson to format/parse documents rather than StringBuilder/Scanner

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#11577: Use Gson to format/parse documents rather than StringBuilder/Scanner
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 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Onionoo      |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 Except for unit tests, we're formatting and parsing JSON documents
 ourselves using classes like StringBuilder and Scanner.  This was the
 quickest way for me to produce a running prototype back in 2011, and it
 scaled surprisingly well.  But there are several reasons for finally
 switching to a JSON library: less code, fewer bugs, and potentially better
 performance.  The most recent hack for #11350 made me think that we
 finally have to switch to Gson for formatting and parsing all our JSON
 documents.

 The following classes should be (de-)serialized using Gson:
  - UptimeDocument
  - ClientsDocument
  - WeightsDocument
  - BandwidthDocument
  - DetailsDocument
  - DetailsStatus

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11577>
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