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// Copyright (c) 2011 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 REMOTING_HOST_PLUGIN_POLICY_HACK_NAT_POLICY_H_
#define REMOTING_HOST_PLUGIN_POLICY_HACK_NAT_POLICY_H_
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
namespace base {
class DictionaryValue;
class MessageLoopProxy;
class TimeDelta;
class WaitableEvent;
} // namespace base
namespace remoting {
namespace policy_hack {
// Watches for changes to the managed remote access host NAT policies.
// If StartWatching() has been called, then before this object can be deleted,
// StopWatching() have completed (the provided |done| event must be signaled).
class NatPolicy {
public:
// Called with the current status of whether or not NAT traversal is enabled.
typedef base::Callback<void(bool)> NatEnabledCallback;
explicit NatPolicy(base::MessageLoopProxy* message_loop_proxy);
virtual ~NatPolicy();
// This guarantees that the |nat_enabled_cb| is called at least once with
// the current policy. After that, |nat_enabled_cb| will be called whenever
// a change to the nat policy is detected.
virtual void StartWatching(const NatEnabledCallback& nat_enabled_cb);
// Should be called after StartWatching() before the object is deleted. Calls
// just wait for |done| to be signaled before deleting the object.
virtual void StopWatching(base::WaitableEvent* done);
// Implemented by each platform. This message loop should be an IO message
// loop.
static NatPolicy* Create(base::MessageLoopProxy* message_loop_proxy);
protected:
virtual void StartWatchingInternal() = 0;
virtual void StopWatchingInternal() = 0;
virtual void Reload() = 0;
// Used to check if the class is on the right thread.
bool OnPolicyThread() const;
// Takes the policy dictionary from the OS specific store and extracts the
// NAT traversal setting.
void UpdateNatPolicy(base::DictionaryValue* new_policy);
// Used for time-based reloads in case something goes wrong with the
// notification system.
void ScheduleFallbackReloadTask();
void ScheduleReloadTask(const base::TimeDelta& delay);
static const char kNatPolicyName[];
private:
scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
NatEnabledCallback nat_enabled_cb_;
bool current_nat_enabled_state_;
bool first_state_published_;
// Allows us to cancel any inflight FileWatcher events or scheduled reloads.
base::WeakPtrFactory<NatPolicy> weak_factory_;
};
} // namespace policy_hack
} // namespace remoting
#endif // REMOTING_HOST_PLUGIN_POLICY_HACK_NAT_POLICY_H_
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