1 // Copyright 2013 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 "chrome/browser/extensions/api/mdns/dns_sd_registry.h" 6 7 #include "base/stl_util.h" 8 #include "chrome/browser/extensions/api/mdns/dns_sd_device_lister.h" 9 #include "chrome/browser/local_discovery/service_discovery_shared_client.h" 10 11 using local_discovery::ServiceDiscoveryClient; 12 using local_discovery::ServiceDiscoverySharedClient; 13 14 namespace extensions { 15 16 namespace { 17 // Predicate to test if two discovered services have the same service_name. 18 class IsSameServiceName { 19 public: 20 explicit IsSameServiceName(const DnsSdService& service) : service_(service) {} 21 bool operator()(const DnsSdService& other) const { 22 return service_.service_name == other.service_name; 23 } 24 25 private: 26 const DnsSdService& service_; 27 }; 28 } // namespace 29 30 DnsSdRegistry::ServiceTypeData::ServiceTypeData( 31 scoped_ptr<DnsSdDeviceLister> lister) 32 : ref_count(1), lister_(lister.Pass()) {} 33 34 DnsSdRegistry::ServiceTypeData::~ServiceTypeData() {} 35 36 void DnsSdRegistry::ServiceTypeData::ListenerAdded() { 37 ref_count++; 38 }; 39 40 bool DnsSdRegistry::ServiceTypeData::ListenerRemoved() { 41 return --ref_count == 0; 42 }; 43 44 int DnsSdRegistry::ServiceTypeData::GetListenerCount() { 45 return ref_count; 46 } 47 48 bool DnsSdRegistry::ServiceTypeData::UpdateService( 49 bool added, const DnsSdService& service) { 50 DnsSdRegistry::DnsSdServiceList::iterator it = 51 std::find_if(service_list_.begin(), 52 service_list_.end(), 53 IsSameServiceName(service)); 54 // Set to true when a service is updated in or added to the registry. 55 bool updated_or_added = added; 56 bool known = (it != service_list_.end()); 57 if (known) { 58 // If added == true, but we still found the service in our cache, then just 59 // update the existing entry, but this should not happen! 60 DCHECK(!added); 61 if (*it != service) { 62 *it = service; 63 updated_or_added = true; 64 } 65 } else if (added) { 66 service_list_.push_back(service); 67 } 68 69 VLOG(1) << "UpdateService: " << service.service_name 70 << ", added: " << added 71 << ", known: " << known 72 << ", updated or added: " << updated_or_added; 73 return updated_or_added; 74 }; 75 76 bool DnsSdRegistry::ServiceTypeData::RemoveService( 77 const std::string& service_name) { 78 for (DnsSdRegistry::DnsSdServiceList::iterator it = service_list_.begin(); 79 it != service_list_.end(); ++it) { 80 if ((*it).service_name == service_name) { 81 service_list_.erase(it); 82 return true; 83 } 84 } 85 return false; 86 }; 87 88 bool DnsSdRegistry::ServiceTypeData::ClearServices() { 89 if (service_list_.empty()) 90 return false; 91 92 service_list_.clear(); 93 return true; 94 } 95 96 const DnsSdRegistry::DnsSdServiceList& 97 DnsSdRegistry::ServiceTypeData::GetServiceList() { 98 return service_list_; 99 } 100 101 DnsSdRegistry::DnsSdRegistry() { 102 #if defined(ENABLE_SERVICE_DISCOVERY) 103 service_discovery_client_ = ServiceDiscoverySharedClient::GetInstance(); 104 #endif 105 } 106 107 DnsSdRegistry::DnsSdRegistry(ServiceDiscoverySharedClient* client) { 108 service_discovery_client_ = client; 109 } 110 111 DnsSdRegistry::~DnsSdRegistry() {} 112 113 void DnsSdRegistry::AddObserver(DnsSdObserver* observer) { 114 observers_.AddObserver(observer); 115 } 116 117 void DnsSdRegistry::RemoveObserver(DnsSdObserver* observer) { 118 observers_.RemoveObserver(observer); 119 } 120 121 DnsSdDeviceLister* DnsSdRegistry::CreateDnsSdDeviceLister( 122 DnsSdDelegate* delegate, 123 const std::string& service_type, 124 local_discovery::ServiceDiscoverySharedClient* discovery_client) { 125 return new DnsSdDeviceLister(discovery_client, delegate, service_type); 126 } 127 128 void DnsSdRegistry::RegisterDnsSdListener(std::string service_type) { 129 VLOG(1) << "RegisterDnsSdListener: " << service_type 130 << ", registered: " << IsRegistered(service_type); 131 if (service_type.empty()) 132 return; 133 134 if (IsRegistered(service_type)) { 135 service_data_map_[service_type]->ListenerAdded(); 136 DispatchApiEvent(service_type); 137 return; 138 } 139 140 scoped_ptr<DnsSdDeviceLister> dns_sd_device_lister(CreateDnsSdDeviceLister( 141 this, service_type, service_discovery_client_)); 142 dns_sd_device_lister->Discover(false); 143 linked_ptr<ServiceTypeData> service_type_data( 144 new ServiceTypeData(dns_sd_device_lister.Pass())); 145 service_data_map_[service_type] = service_type_data; 146 DispatchApiEvent(service_type); 147 } 148 149 void DnsSdRegistry::UnregisterDnsSdListener(std::string service_type) { 150 VLOG(1) << "UnregisterDnsSdListener: " << service_type; 151 DnsSdRegistry::DnsSdServiceTypeDataMap::iterator it = 152 service_data_map_.find(service_type); 153 if (it == service_data_map_.end()) 154 return; 155 156 if (service_data_map_[service_type]->ListenerRemoved()) 157 service_data_map_.erase(it); 158 } 159 160 void DnsSdRegistry::ServiceChanged(const std::string& service_type, 161 bool added, 162 const DnsSdService& service) { 163 VLOG(1) << "ServiceChanged: service_type: " << service_type 164 << ", known: " << IsRegistered(service_type) 165 << ", service: " << service.service_name 166 << ", added: " << added; 167 if (!IsRegistered(service_type)) { 168 return; 169 } 170 171 bool is_updated = 172 service_data_map_[service_type]->UpdateService(added, service); 173 VLOG(1) << "ServiceChanged: is_updated: " << is_updated; 174 175 if (is_updated) { 176 DispatchApiEvent(service_type); 177 } 178 } 179 180 void DnsSdRegistry::ServiceRemoved(const std::string& service_type, 181 const std::string& service_name) { 182 VLOG(1) << "ServiceRemoved: service_type: " << service_type 183 << ", known: " << IsRegistered(service_type) 184 << ", service: " << service_name; 185 if (!IsRegistered(service_type)) { 186 return; 187 } 188 189 bool is_removed = 190 service_data_map_[service_type]->RemoveService(service_name); 191 VLOG(1) << "ServiceRemoved: is_removed: " << is_removed; 192 193 if (is_removed) 194 DispatchApiEvent(service_type); 195 } 196 197 void DnsSdRegistry::ServicesFlushed(const std::string& service_type) { 198 VLOG(1) << "ServicesFlushed: service_type: " << service_type 199 << ", known: " << IsRegistered(service_type); 200 if (!IsRegistered(service_type)) { 201 return; 202 } 203 204 bool is_cleared = service_data_map_[service_type]->ClearServices(); 205 VLOG(1) << "ServicesFlushed: is_cleared: " << is_cleared; 206 207 if (is_cleared) 208 DispatchApiEvent(service_type); 209 } 210 211 void DnsSdRegistry::DispatchApiEvent(const std::string& service_type) { 212 // TODO(justinlin): Make this MaybeDispatchApiEvent instead and dispatch if a 213 // dirty bit is set. 214 VLOG(1) << "DispatchApiEvent: service_type: " << service_type; 215 FOR_EACH_OBSERVER(DnsSdObserver, observers_, OnDnsSdEvent( 216 service_type, service_data_map_[service_type]->GetServiceList())); 217 } 218 219 bool DnsSdRegistry::IsRegistered(const std::string& service_type) { 220 return service_data_map_.find(service_type) != service_data_map_.end(); 221 } 222 223 } // namespace extensions 224
