Brian Warner 5bedca43e3 load-yaml-cache cleanups
* use yaml.safe_load and yaml.safe_dump
  * configure SafeLoader to return unicode consistently, not str
* log+ignore bad cache, instead of throwing error, since we're already
  in the log+ignore chain from connect_failed()
* use a local exception type, instead of one from storage_client.py
* delegate delivery to self._deliver_announcements

Using yaml.safe_dump gives us:

- ann:
    my-version: tahoe-lafs/1.11.0.post96.dev0
    nickname: node-4

instead of:

- ann:
    !!python/unicode 'my-version': !!python/unicode 'tahoe-lafs/1.11.0.post96.dev0'
    !!python/unicode 'nickname': !!python/unicode 'node-4'

We want SafeLoader to consistently return unicode instead of sometimes
plain strings (for ASCII-safe values) and sometimes unicode
(for everything else). The data we write into the cache was all unicode
to start with (it came from a JSON parser), so it seems better to get
back unicode too.
2016-05-11 18:15:50 -07:00
..
2016-05-11 18:15:50 -07:00