[PATCH v2 0/4] Outdate binary session on disconnect

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

Once a connection is closed, a user can learn it using
on_disconnect triggers. But session methods still work:
session.fd() returns socket fd, session.sync() returns request
sync, session.push() realy writes data to obuf and sends it to
iproto thread.

The goal of this patchset is to help user detect session
disconnect even without setting on_disconnect triggers. Patchset
makes a session, whose socket is closed, rotten. It returns an
error on push, -1 on fd, 0 on sync.

This is reached via moving struct session_vtab from a global
array to struct session and changing the vtab on disconnect.

V1: https://www.freelists.org/post/tarantool-patches/PATCH-04-Outdate-disconnected-session

Changes in v2:
- Store vtab in struct session, remove session_vtab_registry;
- Do not change session type on disconnect. Only vtab.

Branch: http://github.com/tarantool/tarantool/tree/gerold103/gh-3859-outdate-session-on-disconnect
Issue: https://github.com/tarantool/tarantool/issues/3859

Vladislav Shpilevoy (4):
  console: forbid arbitrary session type setting
  session: minimize number of session type resets
  session: store vtab in struct session
  session: outdate a session of a closed connection

 src/box/applier.cc      |  6 +++-
 src/box/iproto.cc       | 77 +++++++++++++++++++++++++++++------------
 src/box/lua/console.c   | 15 ++++----
 src/box/lua/console.lua |  4 +--
 src/box/lua/session.c   | 26 ++++++++++----
 src/box/session.cc      | 19 ++++------
 src/box/session.h       | 29 +++++++++++-----
 test/box/push.result    | 50 ++++++++++++++++++++++++++
 test/box/push.test.lua  | 22 ++++++++++++
 9 files changed, 186 insertions(+), 62 deletions(-)

-- 
2.17.2 (Apple Git-113)