OLD | NEW |
| (Empty) |
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "device/geolocation/location_arbitrator_impl.h" | |
6 | |
7 #include <map> | |
8 | |
9 #include "base/bind.h" | |
10 #include "base/bind_helpers.h" | |
11 #include "base/memory/ptr_util.h" | |
12 #include "build/build_config.h" | |
13 #include "device/geolocation/access_token_store.h" | |
14 #include "device/geolocation/geolocation_delegate.h" | |
15 #include "device/geolocation/network_location_provider.h" | |
16 #include "url/gurl.h" | |
17 | |
18 namespace device { | |
19 namespace { | |
20 | |
21 const char* kDefaultNetworkProviderUrl = | |
22 "https://www.googleapis.com/geolocation/v1/geolocate"; | |
23 } // namespace | |
24 | |
25 // To avoid oscillations, set this to twice the expected update interval of a | |
26 // a GPS-type location provider (in case it misses a beat) plus a little. | |
27 const int64_t LocationArbitratorImpl::kFixStaleTimeoutMilliseconds = | |
28 11 * base::Time::kMillisecondsPerSecond; | |
29 | |
30 LocationArbitratorImpl::LocationArbitratorImpl( | |
31 const LocationUpdateCallback& callback, | |
32 GeolocationDelegate* delegate) | |
33 : delegate_(delegate), | |
34 arbitrator_update_callback_(callback), | |
35 provider_update_callback_( | |
36 base::Bind(&LocationArbitratorImpl::OnLocationUpdate, | |
37 base::Unretained(this))), | |
38 position_provider_(nullptr), | |
39 is_permission_granted_(false), | |
40 is_running_(false) {} | |
41 | |
42 LocationArbitratorImpl::~LocationArbitratorImpl() { | |
43 } | |
44 | |
45 GURL LocationArbitratorImpl::DefaultNetworkProviderURL() { | |
46 return GURL(kDefaultNetworkProviderUrl); | |
47 } | |
48 | |
49 void LocationArbitratorImpl::OnPermissionGranted() { | |
50 is_permission_granted_ = true; | |
51 for (const auto& provider : providers_) | |
52 provider->OnPermissionGranted(); | |
53 } | |
54 | |
55 void LocationArbitratorImpl::StartProviders(bool enable_high_accuracy) { | |
56 // Stash options as OnAccessTokenStoresLoaded has not yet been called. | |
57 is_running_ = true; | |
58 enable_high_accuracy_ = enable_high_accuracy; | |
59 | |
60 if (providers_.empty()) { | |
61 RegisterSystemProvider(); | |
62 | |
63 const scoped_refptr<AccessTokenStore> access_token_store = | |
64 GetAccessTokenStore(); | |
65 if (access_token_store && delegate_->UseNetworkLocationProviders()) { | |
66 DCHECK(DefaultNetworkProviderURL().is_valid()); | |
67 token_store_callback_.Reset( | |
68 base::Bind(&LocationArbitratorImpl::OnAccessTokenStoresLoaded, | |
69 base::Unretained(this))); | |
70 access_token_store->LoadAccessTokens(token_store_callback_.callback()); | |
71 return; | |
72 } | |
73 } | |
74 DoStartProviders(); | |
75 } | |
76 | |
77 void LocationArbitratorImpl::DoStartProviders() { | |
78 if (providers_.empty()) { | |
79 // If no providers are available, we report an error to avoid | |
80 // callers waiting indefinitely for a reply. | |
81 Geoposition position; | |
82 position.error_code = Geoposition::ERROR_CODE_PERMISSION_DENIED; | |
83 arbitrator_update_callback_.Run(position); | |
84 return; | |
85 } | |
86 for (const auto& provider : providers_) | |
87 provider->StartProvider(enable_high_accuracy_); | |
88 } | |
89 | |
90 void LocationArbitratorImpl::StopProviders() { | |
91 // Reset the reference location state (provider+position) | |
92 // so that future starts use fresh locations from | |
93 // the newly constructed providers. | |
94 position_provider_ = nullptr; | |
95 position_ = Geoposition(); | |
96 | |
97 providers_.clear(); | |
98 is_running_ = false; | |
99 } | |
100 | |
101 void LocationArbitratorImpl::OnAccessTokenStoresLoaded( | |
102 AccessTokenStore::AccessTokenMap access_token_map, | |
103 const scoped_refptr<net::URLRequestContextGetter>& context_getter) { | |
104 // If there are no access tokens, boot strap it with the default server URL. | |
105 if (access_token_map.empty()) | |
106 access_token_map[DefaultNetworkProviderURL()]; | |
107 for (const auto& entry : access_token_map) { | |
108 RegisterProvider(NewNetworkLocationProvider( | |
109 GetAccessTokenStore(), context_getter, entry.first, entry.second)); | |
110 } | |
111 DoStartProviders(); | |
112 } | |
113 | |
114 void LocationArbitratorImpl::RegisterProvider( | |
115 std::unique_ptr<LocationProvider> provider) { | |
116 if (!provider) | |
117 return; | |
118 provider->SetUpdateCallback(provider_update_callback_); | |
119 if (is_permission_granted_) | |
120 provider->OnPermissionGranted(); | |
121 providers_.push_back(std::move(provider)); | |
122 } | |
123 | |
124 void LocationArbitratorImpl::RegisterSystemProvider() { | |
125 std::unique_ptr<LocationProvider> provider = | |
126 delegate_->OverrideSystemLocationProvider(); | |
127 if (!provider) | |
128 provider = NewSystemLocationProvider(); | |
129 RegisterProvider(std::move(provider)); | |
130 } | |
131 | |
132 void LocationArbitratorImpl::OnLocationUpdate(const LocationProvider* provider, | |
133 const Geoposition& new_position) { | |
134 DCHECK(new_position.Validate() || | |
135 new_position.error_code != Geoposition::ERROR_CODE_NONE); | |
136 if (!IsNewPositionBetter(position_, new_position, | |
137 provider == position_provider_)) | |
138 return; | |
139 position_provider_ = provider; | |
140 position_ = new_position; | |
141 arbitrator_update_callback_.Run(position_); | |
142 } | |
143 | |
144 scoped_refptr<AccessTokenStore> LocationArbitratorImpl::NewAccessTokenStore() { | |
145 return delegate_->CreateAccessTokenStore(); | |
146 } | |
147 | |
148 scoped_refptr<AccessTokenStore> LocationArbitratorImpl::GetAccessTokenStore() { | |
149 if (!access_token_store_) | |
150 access_token_store_ = NewAccessTokenStore(); | |
151 return access_token_store_; | |
152 } | |
153 | |
154 std::unique_ptr<LocationProvider> | |
155 LocationArbitratorImpl::NewNetworkLocationProvider( | |
156 const scoped_refptr<AccessTokenStore>& access_token_store, | |
157 const scoped_refptr<net::URLRequestContextGetter>& context, | |
158 const GURL& url, | |
159 const base::string16& access_token) { | |
160 #if defined(OS_ANDROID) | |
161 // Android uses its own SystemLocationProvider. | |
162 return nullptr; | |
163 #else | |
164 return base::WrapUnique(new NetworkLocationProvider( | |
165 access_token_store, context, url, access_token)); | |
166 #endif | |
167 } | |
168 | |
169 std::unique_ptr<LocationProvider> | |
170 LocationArbitratorImpl::NewSystemLocationProvider() { | |
171 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) | |
172 return nullptr; | |
173 #else | |
174 return device::NewSystemLocationProvider(); | |
175 #endif | |
176 } | |
177 | |
178 base::Time LocationArbitratorImpl::GetTimeNow() const { | |
179 return base::Time::Now(); | |
180 } | |
181 | |
182 bool LocationArbitratorImpl::IsNewPositionBetter( | |
183 const Geoposition& old_position, const Geoposition& new_position, | |
184 bool from_same_provider) const { | |
185 // Updates location_info if it's better than what we currently have, | |
186 // or if it's a newer update from the same provider. | |
187 if (!old_position.Validate()) { | |
188 // Older location wasn't locked. | |
189 return true; | |
190 } | |
191 if (new_position.Validate()) { | |
192 // New location is locked, let's check if it's any better. | |
193 if (old_position.accuracy >= new_position.accuracy) { | |
194 // Accuracy is better. | |
195 return true; | |
196 } else if (from_same_provider) { | |
197 // Same provider, fresher location. | |
198 return true; | |
199 } else if ((GetTimeNow() - old_position.timestamp).InMilliseconds() > | |
200 kFixStaleTimeoutMilliseconds) { | |
201 // Existing fix is stale. | |
202 return true; | |
203 } | |
204 } | |
205 return false; | |
206 } | |
207 | |
208 bool LocationArbitratorImpl::HasPermissionBeenGranted() const { | |
209 return is_permission_granted_; | |
210 } | |
211 | |
212 } // namespace device | |
OLD | NEW |