tree aa79ab6f54f8031eceb1d749f118629e550b84e8
parent e8f5b2bc9f25b3d82ab37896cf159bc5b2961a3e
author Alex Vakulenko <avakulenko@chromium.org> 1431564722 -0700
committer ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> 1431641343 +0000

buffet: Switch XmppChannel to use asynchronous socket streams

Changed XmppClient from using raw socket file descriptors to
chromeos::Stream in preparation of adding TLS support (via subsituting
the regular socket-based FileStream with TlsStream once TLS handshake
is initiated by the XMPP server).

Also implemented exponential backoff for reconnecting to the server
in case of a network error as well as more comprehensive network
read/write mechanism which will tie better into more strict XML-based
parser/communication and renamed XmppClient to XmppChannel after
adding a generic interface for NotificationChannel and NotificationDelegate
which will help us implement other notification channels such as
GCM and periodic polling.

BUG=brillo:458
TEST=`FEATURES=test emerge-link buffet`
     Tested XMPP operation on DUT.

Change-Id: I88d593692ca56d03356155e12cde2f2942f8391e
Reviewed-on: https://chromium-review.googlesource.com/271151
Trybot-Ready: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Nathan Bullock <nathanbullock@google.com>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>