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| 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/network_location_provider.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/location.h" | |
| 9 #include "base/single_thread_task_runner.h" | |
| 10 #include "base/strings/utf_string_conversions.h" | |
| 11 #include "base/threading/thread_task_runner_handle.h" | |
| 12 #include "base/time/time.h" | |
| 13 #include "device/geolocation/access_token_store.h" | |
| 14 | |
| 15 namespace device { | |
| 16 namespace { | |
| 17 // The maximum period of time we'll wait for a complete set of wifi data | |
| 18 // before sending the request. | |
| 19 const int kDataCompleteWaitSeconds = 2; | |
| 20 } // namespace | |
| 21 | |
| 22 // static | |
| 23 const size_t NetworkLocationProvider::PositionCache::kMaximumSize = 10; | |
| 24 | |
| 25 NetworkLocationProvider::PositionCache::PositionCache() {} | |
| 26 | |
| 27 NetworkLocationProvider::PositionCache::~PositionCache() {} | |
| 28 | |
| 29 bool NetworkLocationProvider::PositionCache::CachePosition( | |
| 30 const WifiData& wifi_data, | |
| 31 const Geoposition& position) { | |
| 32 // Check that we can generate a valid key for the wifi data. | |
| 33 base::string16 key; | |
| 34 if (!MakeKey(wifi_data, &key)) { | |
| 35 return false; | |
| 36 } | |
| 37 // If the cache is full, remove the oldest entry. | |
| 38 if (cache_.size() == kMaximumSize) { | |
| 39 DCHECK(cache_age_list_.size() == kMaximumSize); | |
| 40 CacheAgeList::iterator oldest_entry = cache_age_list_.begin(); | |
| 41 DCHECK(oldest_entry != cache_age_list_.end()); | |
| 42 cache_.erase(*oldest_entry); | |
| 43 cache_age_list_.erase(oldest_entry); | |
| 44 } | |
| 45 DCHECK_LT(cache_.size(), kMaximumSize); | |
| 46 // Insert the position into the cache. | |
| 47 std::pair<CacheMap::iterator, bool> result = | |
| 48 cache_.insert(std::make_pair(key, position)); | |
| 49 if (!result.second) { | |
| 50 NOTREACHED(); // We never try to add the same key twice. | |
| 51 CHECK_EQ(cache_.size(), cache_age_list_.size()); | |
| 52 return false; | |
| 53 } | |
| 54 cache_age_list_.push_back(result.first); | |
| 55 DCHECK_EQ(cache_.size(), cache_age_list_.size()); | |
| 56 return true; | |
| 57 } | |
| 58 | |
| 59 // Searches for a cached position response for the current WiFi data. Returns | |
| 60 // the cached position if available, nullptr otherwise. | |
| 61 const Geoposition* NetworkLocationProvider::PositionCache::FindPosition( | |
| 62 const WifiData& wifi_data) { | |
| 63 base::string16 key; | |
| 64 if (!MakeKey(wifi_data, &key)) { | |
| 65 return nullptr; | |
| 66 } | |
| 67 CacheMap::const_iterator iter = cache_.find(key); | |
| 68 return iter == cache_.end() ? nullptr : &iter->second; | |
| 69 } | |
| 70 | |
| 71 // Makes the key for the map of cached positions, using the available data. | |
| 72 // Returns true if a good key was generated, false otherwise. | |
| 73 // | |
| 74 // static | |
| 75 bool NetworkLocationProvider::PositionCache::MakeKey( | |
| 76 const WifiData& wifi_data, | |
| 77 base::string16* key) { | |
| 78 // Currently we use only WiFi data and base the key only on the MAC addresses. | |
| 79 DCHECK(key); | |
| 80 key->clear(); | |
| 81 const size_t kCharsPerMacAddress = 6 * 3 + 1; // e.g. "11:22:33:44:55:66|" | |
| 82 key->reserve(wifi_data.access_point_data.size() * kCharsPerMacAddress); | |
| 83 const base::string16 separator(base::ASCIIToUTF16("|")); | |
| 84 for (const auto& access_point_data : wifi_data.access_point_data) { | |
| 85 *key += separator; | |
| 86 *key += access_point_data.mac_address; | |
| 87 *key += separator; | |
| 88 } | |
| 89 // If the key is the empty string, return false, as we don't want to cache a | |
| 90 // position for such data. | |
| 91 return !key->empty(); | |
| 92 } | |
| 93 | |
| 94 // NetworkLocationProvider factory function | |
| 95 LocationProviderBase* NewNetworkLocationProvider( | |
| 96 const scoped_refptr<AccessTokenStore>& access_token_store, | |
| 97 const scoped_refptr<net::URLRequestContextGetter>& context, | |
| 98 const GURL& url, | |
| 99 const base::string16& access_token) { | |
| 100 return new NetworkLocationProvider( | |
| 101 access_token_store, context, url, access_token); | |
| 102 } | |
| 103 | |
| 104 // NetworkLocationProvider | |
| 105 NetworkLocationProvider::NetworkLocationProvider( | |
| 106 const scoped_refptr<AccessTokenStore>& access_token_store, | |
| 107 const scoped_refptr<net::URLRequestContextGetter>& url_context_getter, | |
| 108 const GURL& url, | |
| 109 const base::string16& access_token) | |
| 110 : access_token_store_(access_token_store), | |
| 111 wifi_data_provider_manager_(nullptr), | |
| 112 wifi_data_update_callback_( | |
| 113 base::Bind(&NetworkLocationProvider::OnWifiDataUpdate, | |
| 114 base::Unretained(this))), | |
| 115 is_wifi_data_complete_(false), | |
| 116 access_token_(access_token), | |
| 117 is_permission_granted_(false), | |
| 118 is_new_data_available_(false), | |
| 119 position_cache_(new PositionCache), | |
| 120 weak_factory_(this) { | |
| 121 request_.reset(new NetworkLocationRequest( | |
| 122 url_context_getter, | |
| 123 url, | |
| 124 base::Bind(&NetworkLocationProvider::OnLocationResponse, | |
| 125 base::Unretained(this)))); | |
| 126 } | |
| 127 | |
| 128 NetworkLocationProvider::~NetworkLocationProvider() { | |
| 129 StopProvider(); | |
| 130 } | |
| 131 | |
| 132 // LocationProvider implementation | |
| 133 void NetworkLocationProvider::GetPosition(Geoposition* position) { | |
| 134 DCHECK(position); | |
| 135 *position = position_; | |
| 136 } | |
| 137 | |
| 138 void NetworkLocationProvider::RequestRefresh() { | |
| 139 // TODO(joth): When called via the public (base class) interface, this should | |
| 140 // poke each data provider to get them to expedite their next scan. | |
| 141 // Whilst in the delayed start, only send request if all data is ready. | |
| 142 // TODO(mcasas): consider not using HasWeakPtrs() https://crbug.com/629158. | |
| 143 if (!weak_factory_.HasWeakPtrs() || is_wifi_data_complete_) { | |
| 144 RequestPosition(); | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 void NetworkLocationProvider::OnPermissionGranted() { | |
| 149 const bool was_permission_granted = is_permission_granted_; | |
| 150 is_permission_granted_ = true; | |
| 151 if (!was_permission_granted && IsStarted()) { | |
| 152 RequestRefresh(); | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 void NetworkLocationProvider::OnWifiDataUpdate() { | |
| 157 DCHECK(wifi_data_provider_manager_); | |
| 158 is_wifi_data_complete_ = wifi_data_provider_manager_->GetData(&wifi_data_); | |
| 159 OnWifiDataUpdated(); | |
| 160 } | |
| 161 | |
| 162 void NetworkLocationProvider::OnLocationResponse( | |
| 163 const Geoposition& position, | |
| 164 bool server_error, | |
| 165 const base::string16& access_token, | |
| 166 const WifiData& wifi_data) { | |
| 167 DCHECK(CalledOnValidThread()); | |
| 168 // Record the position and update our cache. | |
| 169 position_ = position; | |
| 170 if (position.Validate()) { | |
| 171 position_cache_->CachePosition(wifi_data, position); | |
| 172 } | |
| 173 | |
| 174 // Record access_token if it's set. | |
| 175 if (!access_token.empty() && access_token_ != access_token) { | |
| 176 access_token_ = access_token; | |
| 177 access_token_store_->SaveAccessToken(request_->url(), access_token); | |
| 178 } | |
| 179 | |
| 180 // Let listeners know that we now have a position available. | |
| 181 NotifyCallback(position_); | |
| 182 } | |
| 183 | |
| 184 bool NetworkLocationProvider::StartProvider(bool high_accuracy) { | |
| 185 DCHECK(CalledOnValidThread()); | |
| 186 if (IsStarted()) | |
| 187 return true; | |
| 188 DCHECK(!wifi_data_provider_manager_); | |
| 189 if (!request_->url().is_valid()) { | |
| 190 LOG(WARNING) << "StartProvider() : Failed, Bad URL: " | |
| 191 << request_->url().possibly_invalid_spec(); | |
| 192 return false; | |
| 193 } | |
| 194 | |
| 195 // Registers a callback with the data provider. The first call to Register | |
| 196 // will create a singleton data provider and it will be deleted when the last | |
| 197 // callback is removed with Unregister. | |
| 198 wifi_data_provider_manager_ = | |
| 199 WifiDataProviderManager::Register(&wifi_data_update_callback_); | |
| 200 | |
| 201 base::ThreadTaskRunnerHandle::Get()->PostDelayedTask( | |
| 202 FROM_HERE, base::Bind(&NetworkLocationProvider::RequestPosition, | |
| 203 weak_factory_.GetWeakPtr()), | |
| 204 base::TimeDelta::FromSeconds(kDataCompleteWaitSeconds)); | |
| 205 // Get the wifi data. | |
| 206 is_wifi_data_complete_ = wifi_data_provider_manager_->GetData(&wifi_data_); | |
| 207 if (is_wifi_data_complete_) | |
| 208 OnWifiDataUpdated(); | |
| 209 return true; | |
| 210 } | |
| 211 | |
| 212 void NetworkLocationProvider::OnWifiDataUpdated() { | |
| 213 DCHECK(CalledOnValidThread()); | |
| 214 wifi_timestamp_ = base::Time::Now(); | |
| 215 | |
| 216 is_new_data_available_ = is_wifi_data_complete_; | |
| 217 RequestRefresh(); | |
| 218 } | |
| 219 | |
| 220 void NetworkLocationProvider::StopProvider() { | |
| 221 DCHECK(CalledOnValidThread()); | |
| 222 if (IsStarted()) { | |
| 223 wifi_data_provider_manager_->Unregister(&wifi_data_update_callback_); | |
| 224 } | |
| 225 wifi_data_provider_manager_ = nullptr; | |
| 226 weak_factory_.InvalidateWeakPtrs(); | |
| 227 } | |
| 228 | |
| 229 // Other methods | |
| 230 void NetworkLocationProvider::RequestPosition() { | |
| 231 DCHECK(CalledOnValidThread()); | |
| 232 if (!is_new_data_available_) | |
| 233 return; | |
| 234 | |
| 235 const Geoposition* cached_position = | |
| 236 position_cache_->FindPosition(wifi_data_); | |
| 237 DCHECK(!wifi_timestamp_.is_null()) | |
| 238 << "Timestamp must be set before looking up position"; | |
| 239 if (cached_position) { | |
| 240 DCHECK(cached_position->Validate()); | |
| 241 // Record the position and update its timestamp. | |
| 242 position_ = *cached_position; | |
| 243 // The timestamp of a position fix is determined by the timestamp | |
| 244 // of the source data update. (The value of position_.timestamp from | |
| 245 // the cache could be from weeks ago!) | |
| 246 position_.timestamp = wifi_timestamp_; | |
| 247 is_new_data_available_ = false; | |
| 248 // Let listeners know that we now have a position available. | |
| 249 NotifyCallback(position_); | |
| 250 return; | |
| 251 } | |
| 252 // Don't send network requests until authorized. http://crbug.com/39171 | |
| 253 if (!is_permission_granted_) | |
| 254 return; | |
| 255 | |
| 256 weak_factory_.InvalidateWeakPtrs(); | |
| 257 is_new_data_available_ = false; | |
| 258 | |
| 259 // TODO(joth): Rather than cancel pending requests, we should create a new | |
| 260 // NetworkLocationRequest for each and hold a set of pending requests. | |
| 261 if (request_->is_request_pending()) { | |
| 262 DVLOG(1) << "NetworkLocationProvider - pre-empting pending network request " | |
| 263 "with new data. Wifi APs: " | |
| 264 << wifi_data_.access_point_data.size(); | |
| 265 } | |
| 266 request_->MakeRequest(access_token_, wifi_data_, wifi_timestamp_); | |
| 267 } | |
| 268 | |
| 269 bool NetworkLocationProvider::IsStarted() const { | |
| 270 return wifi_data_provider_manager_ != nullptr; | |
| 271 } | |
| 272 | |
| 273 } // namespace device | |
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Chromium Code Reviews
Issue 2192683003:
Revert of Reland: Geolocation: move from content/browser to device/ (patchset #2 id:20001 of https:… (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@2810