[Tarantool-patches] [PATCH v9 0/3] iproto: greeting enhancement

[Ilya Kosarev]

These patches move greeting from tx thread to iproto and introduce
improvements into iproto logic.

Branch: https://github.com/tarantool/tarantool/tree/i.kosarev/gh-3776-handling-connections-in-iproto
Issue: https://github.com/tarantool/tarantool/issues/3776

Changes in v2:
 - docbot request provided
 - ChangeLog provided
 - net_send_msg() used instead of net_send_error() where needed
 - error cases made clear in iproto_msg_decode()
 - replaced net_check_connection() with iproto_connection_fail() predicate
 - improved tx session initialization fail processing to avoid extra tries
 - fixed obuf_dup() fail processing in iproto_process_connect()
 - added some comments
 - some comments style fixed

Changes in v3:
 - added braces to the confusing one-line if statement
 - updated ChangeLog
 - added description for iproto_msg_decode()
 - simplified error processing in iproto_msg_decode()

Changes in v4:
 - fixed msg->close_connection initialization bug
 - fixed false-sharing problem in iproto_connection struct
 - added needed assertion
 - added needed comments
 - names refactoring
 - simplified patch a bit: removed extra return value, extra 
 
Changes in v5:
 - reworked to avoid lazy initialization and extra changes

Changes in v6:
 - some changes are picket out into separate commits
 - main commit message rewrited to become more comprehensive
 - removed some extra changes
 - style fixes
 - greeting allocation fixed

Changes in v7:
 - fixed functions signatures & added comments
 - partial greeting write taken into account
 - added needed state

Changes in v8:
 - style fix
 - iproto now starts to read right after greeting and can close the socket

Changes in v9:
 - simplified processing of closed connections in tx (no extra state reading)
 - removed extra iproto_connection_stop_msg_max_limit() not applicable call

Ilya Kosarev (3):
  iproto: move msg fields initialization to iproto_msg_new()
  iproto: fix comment and add assert on destruction
  iproto: move greeting from tx thread to iproto

 src/box/iproto.cc                             | 194 ++++++++++++++----
 test/app/gh-4787-netbox-empty-errmsg.result   |  18 --
 test/app/gh-4787-netbox-empty-errmsg.test.lua |   8 -
 3 files changed, 150 insertions(+), 70 deletions(-)

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2.17.1