[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/dial_media_sink_cache_service.cc

Index: chrome/browser/media/router/dial_media_sink_cache_service.cc
diff --git a/chrome/browser/media/router/dial_media_sink_cache_service.cc b/chrome/browser/media/router/dial_media_sink_cache_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c2c8e2d799040d1edb9839f00307b2c909fa3e52
--- /dev/null
+++ b/chrome/browser/media/router/dial_media_sink_cache_service.cc
@@ -0,0 +1,107 @@
+// Copyright 2017 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.
+
+#include "chrome/browser/media/router/dial_media_sink_cache_service.h"
+
+#include "base/time/time.h"
+#include "chrome/browser/extensions/api/dial/device_description_fetcher.h"
+#include "chrome/browser/extensions/api/dial/dial_api.h"
+#include "chrome/browser/extensions/api/dial/dial_api_factory.h"
+#include "chrome/browser/extensions/api/dial/dial_device_data.h"
+#include "chrome/browser/media/router/media_sinks_observer.h"
+#include "chrome/browser/media/router/mojo/media_router_mojo_impl.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/browser_thread.h"
+
+using base::Time;
+using base::TimeDelta;
+
+namespace {
+// The maximum time a response is expected after a M-SEARCH request.
+const int kSinkAliveTimeoutSecs = 2;
+}
+
+namespace media_router {
+
+DialMediaSinkCacheService::DialMediaSinkCacheService() {}
+DialMediaSinkCacheService::~DialMediaSinkCacheService() {}
+
+std::vector<MediaSinkInternal> DialMediaSinkCacheService::GetAliveSinks() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  std::vector<MediaSinkInternal> alive_sinks;
+  for (const auto& sink_it : cached_sinks_) {
+    if (IsAlive(sink_it.second))
+      alive_sinks.push_back(sink_it.second.sink);
+  }
+  return alive_sinks;
+}
+
+void DialMediaSinkCacheService::PruneInactiveSinks(
+    bool network_connected,
+    DeviceDescriptionService* description_service,
+    net::URLRequestContextGetter* request_context) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  if (!network_connected)
+    return;
+
+  for (const auto& sink_it : cached_sinks_) {
+    if (IsAlive(sink_it.second))
+      continue;
+
+    description_service->CheckAccess(
+        sink_it.second.description_url, request_context,
+        base::Bind(&DialMediaSinkCacheService::OnCheckAccessCompleted,
+                   base::Unretained(this), sink_it.first));
+  }
+}
+
+void DialMediaSinkCacheService::OnCheckAccessCompleted(
+    const std::string& sink_id,
+    bool is_accessible) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  if (!is_accessible)
+    cached_sinks_.erase(sink_id);
+}
+
+bool DialMediaSinkCacheService::AddOrUpdateSink(
+    const DialDeviceDescription& device_description) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  MediaSink sink(device_description.unique_id, device_description.friendly_name,
+                 MediaSink::IconType::CAST);
+  DialSinkExtraData extra_data;
+  extra_data.app_url = device_description.app_url;
+  extra_data.model_name = device_description.model_name;
+  DCHECK(
+      extra_data.ip_address.AssignFromIPLiteral(device_description.ip_address));
+
+  CachedDialMediaSink cached_sink;
+  cached_sink.sink = MediaSinkInternal(sink, extra_data);
+  cached_sink.last_update_time = base::Time::Now();
+  cached_sink.description_url = device_description.device_description_url;
+
+  const auto& sink_it = cached_sinks_.find(sink.id());
+  if (sink_it == cached_sinks_.end()) {
+    cached_sinks_.insert(std::make_pair(sink.id(), cached_sink));
+  } else {
+    if (cached_sink.sink == sink_it->second.sink)
+      return false;
+
+    sink_it->second = cached_sink;
+  }
+  return true;
+}
+
+bool DialMediaSinkCacheService::IsAlive(const CachedDialMediaSink& sink) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  return sink.last_update_time +
+             base::TimeDelta::FromSeconds(kSinkAliveTimeoutSecs) >
+         base::Time::Now();
+}
+
+}  // namespace media_router