[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2826: CLI: allow dispatch functions to return a Deferred

[Tahoe-LAFS]

#2826: CLI: allow dispatch functions to return a Deferred
--------------------+------------------------
 Reporter:  warner  |          Owner:  warner
     Type:  task    |         Status:  new
 Priority:  normal  |      Milestone:  1.12.0
Component:  code    |        Version:  1.11.0
 Keywords:          |  Launchpad Bug:
--------------------+------------------------
 This will enable #2490 to run (async) Tor operations during `tahoe create-
 node --listen=tor`. Currently all CLI dispatch functions must finish
 synchronously.

 The file-operation subcommands, which use blocking `httplib` calls, must
 be run from unit tests under `deferToThread`. #2825 is about fixing that,
 but this ticket will do some cleanup that will help. Specifically it will
 move the deferToThread down into `runner.py`, using the thread only on the
 subcommands which really need it. After this is fixed, there should be no
 deferToThread calls in the unit tests.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2826>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage