[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2864: welcome page can't display when introducer connection has problems

[Tahoe-LAFS]

#2864: welcome page can't display when introducer connection has problems
-------------------------------+------------------------
 Reporter:  warner             |          Owner:
     Type:  defect             |         Status:  new
 Priority:  normal             |      Milestone:  1.13.0
Component:  code-frontend-web  |        Version:  1.12.1
 Keywords:                     |  Launchpad Bug:
-------------------------------+------------------------
 While debugging some I2P-based introducer problems, IRC user "ls" noticed
 that the welcome page fails to render (i.e. displays a traceback) if the
 `ConnectionInfo` returned by foolscap's
 `Reconnector.getReconnectingInfo()` is None.

 {{{
   File "src/allmydata/web/root.py", line 245, in
 data_connected_introducers
     return len([1 for cs in self.client.introducer_connection_statuses()
   File "src/allmydata/client.py", line 614, in
 introducer_connection_statuses
     return [ic.connection_status() for ic in self.introducer_clients]
   File "src/allmydata/introducer/client.py", line 335, in
 connection_status
     return connection_status.from_foolscap_reconnector(irc, last_received)
   File "src/allmydata/util/connection_status.py", line 34, in
 from_foolscap_reconnector
     others = set(ci.connectorStatuses.keys())
 exceptions.AttributeError: 'NoneType' object has no attribute
 'connectorStatuses'
 }}}

 I think this can happen if there is no valid connection handler for the
 introducer FURL, but I need to explore some more to be sure.

 In any case, this needs to be reported better, and not cause an exception.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2864>
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