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[tor-bugs] #11428 [Onionoo]: Always return non-empty bandwidth and clients documents for running relays/bridges



#11428: Always return non-empty bandwidth and clients documents for running
relays/bridges
-------------------------+-------------------------
 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Onionoo      |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
-------------------------+-------------------------
 Bandwidth documents are based on bandwidth histories contained in extra-
 info descriptors, and clients documents are based on directory request
 statistics contained in bridge extra-info descriptors.

 There are situations when a new relay or bridge doesn't report a long-
 enough bandwidth history for us to write a bandwidth document.  And it
 probably happens even more frequently that a bridge doesn't report
 directory request statistics, so we don't write a clients document.

 The effect is that we may return a details and an uptime document for
 those relays/bridges, but no bandwidth or clients documents.  This may
 confuse Onionoo clients, which last happend in #9889.

 What we should do is return non-empty bandwidth and clients documents for
 running relays and bridges.  These can contain just the fingerprint and no
 graph data.

 Implementation change:
  - When writing a response and can't find a bandwidth or clients file,
 generate one on the fly that only contains the fingerprint or hashed
 fingerprint.

 Spec changes:
  - Make `write_history` and `read_history` in bandwidth documents
 optional.  We need to make sure that all known Onionoo clients can handle
 this change and don't break if these formerly required files go away.
  - While doing so, let's make `uptime` in bridge uptime documents
 optional.  That will also make it consistent with relay uptime documents.
 This change is not directly related to this bug, but leaving this field
 required seems inconsistent.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11428>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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