[Tarantool-patches] [PATCH v12 0/8] box: implement cmod Lua module

[Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

The cmod module provide a way to execute C stored procedures
on read only nodes without registering them in `_func` system space.

The series implements a bare minimum. Vlad, please take a look
once time permit.

v1-v3 are development ones and not sent.

v5 (by vlad):
 - drop exists, list methods: they are redundant
 - rename cfunc to cbox
 - when create a function make it callable Lua object
 - initialize cbox out of modules
 - fix error in passing module name for reloading
 - make api been cbox.func.[create|drop] and
   cbox.module.reload
 - fix test for OSX sake

v6 (by vlad):
 - move module handling into module_cache file.
v7:
 - development
v8:
 - use rbtree for function instance storage, since
   i don't like the idea of unexpected rehashing of
   values in case of massive number of functions
   allocated
 - use reference counter and free function instance
   if only load/unload are coupled
 - keep a pointer to the function inside Lua object
   so we don't need to lookup on every function call.
   this force us to implement __gc method
 - use new API and update docs
v9:
 - development
v10:
 - use hashes for function names lookup
 - simply function loads counting
 - use luaL_register_module and luaL_register_type for
   easier methods registering
 - carry functions as userdata object
v11:
 - development
v12:
 - switch to new API as been discussed in
   https://lists.tarantool.org/tarantool-patches/e186c454-6765-4776-6433-f3f791ff4c27@tarantool.org/

branch gorcunov/gh-4642-func-ro-12
issue https://github.com/tarantool/tarantool/issues/4642

Cyrill Gorcunov (8):
  box/func: factor out c function entry structure
  module_cache: move module handling into own subsystem
  module_cache: improve naming
  module_cache: direct update a cache value on reload
  module_cache: rename calls to ref in module structure
  module_cache: provide helpers to load and unload modules
  box/cmod: implement cmod Lua module
  test: box/cfunc -- add cmod test

 src/box/CMakeLists.txt  |   2 +
 src/box/func.c          | 491 +--------------------------
 src/box/func.h          |  41 +--
 src/box/func_def.h      |  14 -
 src/box/lua/cmod.c      | 718 ++++++++++++++++++++++++++++++++++++++++
 src/box/lua/cmod.h      |  24 ++
 src/box/lua/init.c      |   2 +
 src/box/module_cache.c  | 557 +++++++++++++++++++++++++++++++
 src/box/module_cache.h  | 158 +++++++++
 test/box/CMakeLists.txt |   2 +
 test/box/cfunc1.c       |  58 ++++
 test/box/cfunc2.c       | 132 ++++++++
 test/box/cmod.result    | 199 +++++++++++
 test/box/cmod.test.lua  |  70 ++++
 test/box/suite.ini      |   2 +-
 15 files changed, 1933 insertions(+), 537 deletions(-)
 create mode 100644 src/box/lua/cmod.c
 create mode 100644 src/box/lua/cmod.h
 create mode 100644 src/box/module_cache.c
 create mode 100644 src/box/module_cache.h
 create mode 100644 test/box/cfunc1.c
 create mode 100644 test/box/cfunc2.c
 create mode 100644 test/box/cmod.result
 create mode 100644 test/box/cmod.test.lua


base-commit: d712f83c105d107bac2491703fef5e154f54f55d
-- 
2.29.2