Changes in synapse v0.29.0-rc1 (2018-05-14)

===========================================

Notable changes, a docker file for running Synapse (Thanks to @kaiyou!) and a
closed spec bug in the Client Server API. Additionally further prep for Python 3
migration.

Potentially breaking change:

* Make Client-Server API return 401 for invalid token (PR #3161).

  This changes the Client-server spec to return a 401 error code instead of 403
  when the access token is unrecognised. This is the behaviour required by the
  specification, but some clients may be relying on the old, incorrect
  behaviour.

  Thanks to @NotAFile for fixing this.

Features:

* Add a Dockerfile for synapse (PR #2846) Thanks to @kaiyou!

Changes:

* nuke-room-from-db.sh: added postgresql option and help (PR #2337) Thanks to @rubo77!
* Make 'unexpected logging context' into warnings (PR #3007)
* Open certificate files as bytes (PR #3084) Thanks to @NotAFile!
* Open config file in non-bytes mode (PR #3085) Thanks to @NotAFile!
* Make event properties raise AttributeError instead (PR #3102) Thanks to @NotAFile!
* Use six.moves.urlparse (PR #3108) Thanks to @NotAFile!
* Use deferred.addTimeout instead of time_bound_deferred (PR #3127)
* remove duplicates from groups tables (PR #3129)
* Miscellaneous fixes to python_dependencies (PR #3136)
* Improve exception handling for background processes (PR #3138)
* Add missing consumeErrors to improve exception handling (PR #3139)
* Use run_in_background in preference to preserve_fn (PR #3140)
* Refactor event storage to prepare for changes in state calculations (PR #3141)
* reraise exceptions more carefully (PR #3142)
* Remove redundant call to preserve_fn (PR #3143)
* Trap exceptions thrown within run_in_background (PR #3144)
* Add py3 tests to tox with folders that work (PR #3145) Thanks to @NotAFile!
* Don't yield in list comprehensions (PR #3150) Thanks to @NotAFile!
* Move more xrange to six (PR #3151) Thanks to @NotAFile!
* make imports local (PR #3152) Thanks to @NotAFile!
* move httplib import to six (PR #3153) Thanks to @NotAFile!
* Replace stringIO imports with six (PR #3154) Thanks to @NotAFile!
* more bytes strings (PR #3155) Thanks to @NotAFile!
* Construct HMAC as bytes on py3 (PR #3156) Thanks to @NotAFile!
* run config tests on py3 (PR #3159) Thanks to @NotAFile!
* add guard for None on purge_history api (PR #3160) Thanks to @krombel!
* Refactor /context to reuse pagination storage functions (PR #3193)
* Refactor recent events func to use pagination func (PR #3195)
* Refactor pagination DB API to return concrete type (PR #3196)
* Refactor get_recent_events_for_room return type (PR #3198)
* Refactor sync APIs to reuse pagination API (PR #3199)
* Remove unused code path from member change DB func (PR #3200)
* Part user from rooms on account deactivate (PR #3201)
* Refactor request handling wrappers (PR #3203)
* transaction_id, destination defined twice (PR #3209) Thanks to @damir-manapov!

Bug Fixes:

* synapse fails to start under Twisted >= 18.4 (PR #3135)
* Fix incorrect reference to StringIO (PR #3168)
* Fix a class of logcontext leaks (PR #3170)
* Fix a couple of logcontext leaks in unit tests (PR #3172)
* Fix logcontext leak in media repo (PR #3174)
* Escape label values in prometheus metrics (PR #3175)
* fix http request timeout code (PR #3178)
* Fix 'Unhandled Error' logs with Twisted 18.4 (PR #3182) Thanks to @Half-Shot!
* Fix logcontext leaks in rate limiter (PR #3183)
* Fix metrics that have integer value labels (PR #3186)
* notifications: Convert next_token to string according to the spec (PR #3190) Thanks to @mujx!
* nuke-room-from-db.sh: fix deletion from search table (PR #3194) Thanks to @rubo77!
* Set Server header in SynapseRequest (PR #3208)