[tarantool-patches] [PATCH v3 0/6] box: stacked diagnostics area in fiber

[Kirill Shcherbatov <kshcherbatov@tarantool.org>]

Support stacked diagnostics for Tarantool allows to accumulate all
occurred errors during processing a request. This allows to better
understand what has happened and handle errors correspondingly.

This patch introduces core methods diag_add(), diag_svp(),
diag_rollback_to_svp() that allows you to produce a better
diagnostics information for a user.

There is an other new Lua endpoint
box.error.prev() that allows you to get a reason for a given
error object.

Changes in v3:
  - fixed Kostya's comments
  - implemented iproto support for stacked diagnostics

Changes in v2:
 - new API - user shouldn't have an ability to modify an existent
   error object that he didn't constructed.
 - a new detailed unit-test that performs a good coverage for
   many complicated reference-counting scenarios.

Branch: http://github.com/tarantool/tarantool/tree/kshch/gh-1148-stacked-errors
Issue: https://github.com/tarantool/tarantool/issues/1148

Kirill Shcherbatov (6):
  box: rfc for stacked diagnostic area in Tarantool
  box: rename diag_add_error to diag_set_error
  box: introduce stacked diagnostic area
  box: extend box.error.new({}) API
  iproto: refactor error encoding with mpstream
  iproto: support stacked diagnostics for errors

 src/box/error.h                     |   5 +-
 src/box/iproto_constants.h          |   1 +
 src/lib/core/diag.h                 |  84 +++++++++++-
 src/lib/core/exception.h            |   2 +-
 src/lua/error.h                     |   3 +
 src/box/key_list.c                  |  16 +--
 src/box/lua/call.c                  |   6 +-
 src/box/sql/vdbe.c                  |   2 +-
 src/box/vy_scheduler.c              |   6 +-
 src/box/xrow.c                      | 198 +++++++++++++++++++++++-----
 src/lib/core/diag.c                 |   1 +
 src/lua/error.c                     |   2 +-
 src/lua/utils.c                     |   2 +-
 test/app-tap/module_api.c           |   3 +-
 test/box/function1.c                |  29 ++--
 test/box/reload1.c                  |  20 +--
 test/box/reload2.c                  |   9 +-
 test/box/tuple_bench.c              |  10 +-
 doc/rfc/1148-stacked-diagnostics.md | 180 +++++++++++++++++++++++++
 src/box/applier.cc                  |   2 +-
 src/box/error.cc                    |   7 +-
 src/box/lua/error.cc                |  35 ++++-
 src/box/lua/net_box.lua             |  24 +++-
 src/box/relay.cc                    |   4 +-
 src/lib/core/exception.cc           |   2 +-
 src/lua/error.lua                   |  12 ++
 test/app/fiber.result               |   7 +-
 test/box-py/iproto.result           |   6 +-
 test/box-py/iproto.test.py          |   6 +-
 test/box/misc.result                | 159 +++++++++++++++++++++-
 test/box/misc.test.lua              |  49 +++++++
 test/engine/func_index.result       |  52 ++++++--
 test/engine/func_index.test.lua     |   7 +
 test/unit/CMakeLists.txt            |   2 +-
 test/unit/fiber.cc                  | 157 ++++++++++++++++++++++
 test/unit/fiber.result              |  60 +++++++++
 36 files changed, 1045 insertions(+), 125 deletions(-)
 create mode 100644 doc/rfc/1148-stacked-diagnostics.md

-- 
2.22.1