[Tarantool-patches] [PATCH v8 00/12] lua/log: add an ability to setup logger without box.cfg{}

[Cyrill Gorcunov]

In the series we add an ability to configure logger early
without calling box.cfg{}. The syntax is the same as
in box.cfg{} call.

There was an idea to implement something similar via triggers but
I think this will require a way more efforts and code redesign,
so at first lets stick to simplier solution.

Guys, please don't Ack/LGTM the messages which already have Reviewed-by tags.
Hopefully this is the last series and code is ready for merging. Though
I should confess I dont like it much even this "simple" solution looks
too complex.

v2 by Oleg:
 - hide box_api symbols from users
 - initialize logger via log.cfg() call to look similar to box.cfg
v3 by Oleg:
 - add parametesr verification
 - allow to reconfig via log.cfg() call
v4 by Oleg:
 - lua style fixes
 - extent test (I didn't find a way to test wrong params verification
   inside tap test, so I did it manually. Still we might extent the
   test on top of the series).
v5..v6:
 - left for internal use
v7 by Oleg and Leonid:
 - add bidirectional sync between log and box settings
 - symbolic names for levels
 - test extension
 - reduce ffi usage
v7 by Oleg:
 - add verification for `log` being immutable once set via
   box or log interface
 - more precise check for dynamic configs
 - test enhansion for new cases

branch gorcunov/gh-689-logger-8
issue https://github.com/tarantool/tarantool/issues/689

Cyrill Gorcunov (12):
  core/say: do not reconfig early set up logger
  core/say: use say_logger_initialized in say_logger_free
  lua/log: declare say_logger_init and say_logger_initialized
  lua/log: put string constants to map
  lua/log: do not allow to set json for boot logger
  lua/log: declare log as separate variable
  lua/log: use log module settings inside box.cfg
  lua/log: allow to configure logging without a box
  test: logger -- use log module directly
  log/lua: allow to specify logging level as a string
  lua/log: use log_cfg instead of ffi's instances
  test: logger -- consider more cases

 src/box/lua/load_cfg.lua     |  35 ++++-
 src/lib/core/say.c           |  15 +-
 src/lib/core/say.h           |   4 +
 src/lua/log.lua              | 297 ++++++++++++++++++++++++++++++++---
 test/app-tap/logger.test.lua | 100 +++++++++++-
 5 files changed, 418 insertions(+), 33 deletions(-)

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2.26.2