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>
diff --git a/buffet/notification/notification_channel.h b/buffet/notification/notification_channel.h
new file mode 100644
index 0000000..ab33dd2
--- /dev/null
+++ b/buffet/notification/notification_channel.h
@@ -0,0 +1,31 @@
+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BUFFET_NOTIFICATION_NOTIFICATION_CHANNEL_H_
+#define BUFFET_NOTIFICATION_NOTIFICATION_CHANNEL_H_
+
+#include <string>
+
+namespace base {
+class DictionaryValue;
+} // namespace base
+
+namespace buffet {
+
+class NotificationDelegate;
+
+class NotificationChannel {
+ public:
+ virtual ~NotificationChannel() = default;
+
+ virtual std::string GetName() const = 0;
+ virtual void AddChannelParameters(base::DictionaryValue* channel_json) = 0;
+
+ virtual void Start(NotificationDelegate* delegate) = 0;
+ virtual void Stop() = 0;
+};
+
+} // namespace buffet
+
+#endif // BUFFET_NOTIFICATION_NOTIFICATION_CHANNEL_H_
