Certificate Transparency: New component for obtaining fresh STHs.

net/cert/sth_observer.h

+// Copyright 2016 The Chromium 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 NET_CERT_STH_OBSERVER_H_
+#define NET_CERT_STH_OBSERVER_H_
+
+#include <set>
+
+#include "net/base/net_export.h"
+
+namespace net {
+
+namespace ct {
+
+struct SignedTreeHead;
+
+// Interface for receiving notifications of new STHs observed.
+class NET_EXPORT STHObserver {
+ public:
+  virtual ~STHObserver() {}
+
+  // Called with a new |sth| when one is observed.
+  // Expected to be called on the IO thread.

[Ryan Sleevi, 2016/04/07 18:00:13]

Layering: Don't talk about "the IO thread" in //net - we stay ignorant of that.

All of //net is assumed to be thread-unsafe - it's created, lives, and dies on a
single thread. The only time we call out threads is when an object is taking
taskrunners or when it internally has peculiar thread semantics.

Really, you can just delete line 24.

[Eran Messeri, 2016/04/07 20:52:54]

Done.

+  virtual void NewSTHObserved(const SignedTreeHead& sth) = 0;
+};
+
+}  // namespace ct
+
+}  // namespace net
+
+#endif  // NET_CERT_STH_OBSERVER_H_