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// Copyright 2013 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/extensions/api/mdns/dns_sd_registry.h"
#include <utility>
#include "base/memory/ptr_util.h"
#include "base/stl_util.h"
#include "chrome/browser/extensions/api/mdns/dns_sd_device_lister.h"
#include "chrome/browser/local_discovery/service_discovery_shared_client.h"
#include "chrome/common/features.h"
using local_discovery::ServiceDiscoveryClient;
using local_discovery::ServiceDiscoverySharedClient;
namespace extensions {
namespace {
// Predicate to test if two discovered services have the same service_name.
class IsSameServiceName {
public:
explicit IsSameServiceName(const DnsSdService& service) : service_(service) {}
bool operator()(const DnsSdService& other) const {
return service_.service_name == other.service_name;
}
private:
const DnsSdService& service_;
};
} // namespace
DnsSdRegistry::ServiceTypeData::ServiceTypeData(
std::unique_ptr<DnsSdDeviceLister> lister)
: ref_count(1), lister_(std::move(lister)) {}
DnsSdRegistry::ServiceTypeData::~ServiceTypeData() {}
void DnsSdRegistry::ServiceTypeData::ListenerAdded() {
ref_count++;
}
bool DnsSdRegistry::ServiceTypeData::ListenerRemoved() {
return --ref_count == 0;
}
int DnsSdRegistry::ServiceTypeData::GetListenerCount() {
return ref_count;
}
bool DnsSdRegistry::ServiceTypeData::UpdateService(
bool added, const DnsSdService& service) {
DnsSdRegistry::DnsSdServiceList::iterator it =
std::find_if(service_list_.begin(),
service_list_.end(),
IsSameServiceName(service));
// Set to true when a service is updated in or added to the registry.
bool updated_or_added = added;
bool known = (it != service_list_.end());
if (known) {
// If added == true, but we still found the service in our cache, then just
// update the existing entry, but this should not happen!
DCHECK(!added);
if (*it != service) {
*it = service;
updated_or_added = true;
}
} else if (added) {
service_list_.push_back(service);
}
VLOG(1) << "UpdateService: " << service.service_name
<< ", added: " << added
<< ", known: " << known
<< ", updated or added: " << updated_or_added;
return updated_or_added;
}
bool DnsSdRegistry::ServiceTypeData::RemoveService(
const std::string& service_name) {
for (DnsSdRegistry::DnsSdServiceList::iterator it = service_list_.begin();
it != service_list_.end(); ++it) {
if ((*it).service_name == service_name) {
service_list_.erase(it);
return true;
}
}
return false;
}
void DnsSdRegistry::ServiceTypeData::ForceDiscovery() {
lister_->Discover(false);
}
bool DnsSdRegistry::ServiceTypeData::ClearServices() {
lister_->Discover(false);
if (service_list_.empty())
return false;
service_list_.clear();
return true;
}
const DnsSdRegistry::DnsSdServiceList&
DnsSdRegistry::ServiceTypeData::GetServiceList() {
return service_list_;
}
DnsSdRegistry::DnsSdRegistry() {
#if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
service_discovery_client_ = ServiceDiscoverySharedClient::GetInstance();
#endif
}
DnsSdRegistry::DnsSdRegistry(ServiceDiscoverySharedClient* client) {
service_discovery_client_ = client;
}
DnsSdRegistry::~DnsSdRegistry() {}
void DnsSdRegistry::AddObserver(DnsSdObserver* observer) {
observers_.AddObserver(observer);
}
void DnsSdRegistry::RemoveObserver(DnsSdObserver* observer) {
observers_.RemoveObserver(observer);
}
DnsSdDeviceLister* DnsSdRegistry::CreateDnsSdDeviceLister(
DnsSdDelegate* delegate,
const std::string& service_type,
local_discovery::ServiceDiscoverySharedClient* discovery_client) {
return new DnsSdDeviceLister(discovery_client, delegate, service_type);
}
void DnsSdRegistry::Publish(const std::string& service_type) {
DispatchApiEvent(service_type);
}
void DnsSdRegistry::ForceDiscovery() {
for (const auto& next_service : service_data_map_) {
next_service.second->ForceDiscovery();
}
}
void DnsSdRegistry::RegisterDnsSdListener(const std::string& service_type) {
VLOG(1) << "RegisterDnsSdListener: " << service_type
<< ", registered: " << IsRegistered(service_type);
if (service_type.empty())
return;
if (IsRegistered(service_type)) {
service_data_map_[service_type]->ListenerAdded();
DispatchApiEvent(service_type);
return;
}
std::unique_ptr<DnsSdDeviceLister> dns_sd_device_lister(
CreateDnsSdDeviceLister(this, service_type,
service_discovery_client_.get()));
dns_sd_device_lister->Discover(false);
service_data_map_[service_type] =
base::MakeUnique<ServiceTypeData>(std::move(dns_sd_device_lister));
DispatchApiEvent(service_type);
}
void DnsSdRegistry::UnregisterDnsSdListener(const std::string& service_type) {
VLOG(1) << "UnregisterDnsSdListener: " << service_type;
auto it = service_data_map_.find(service_type);
if (it == service_data_map_.end())
return;
if (service_data_map_[service_type]->ListenerRemoved())
service_data_map_.erase(it);
}
void DnsSdRegistry::ServiceChanged(const std::string& service_type,
bool added,
const DnsSdService& service) {
VLOG(1) << "ServiceChanged: service_type: " << service_type
<< ", known: " << IsRegistered(service_type)
<< ", service: " << service.service_name
<< ", added: " << added;
if (!IsRegistered(service_type)) {
return;
}
bool is_updated =
service_data_map_[service_type]->UpdateService(added, service);
VLOG(1) << "ServiceChanged: is_updated: " << is_updated;
if (is_updated) {
DispatchApiEvent(service_type);
}
}
void DnsSdRegistry::ServiceRemoved(const std::string& service_type,
const std::string& service_name) {
VLOG(1) << "ServiceRemoved: service_type: " << service_type
<< ", known: " << IsRegistered(service_type)
<< ", service: " << service_name;
if (!IsRegistered(service_type)) {
return;
}
bool is_removed =
service_data_map_[service_type]->RemoveService(service_name);
VLOG(1) << "ServiceRemoved: is_removed: " << is_removed;
if (is_removed)
DispatchApiEvent(service_type);
}
void DnsSdRegistry::ServicesFlushed(const std::string& service_type) {
VLOG(1) << "ServicesFlushed: service_type: " << service_type
<< ", known: " << IsRegistered(service_type);
if (!IsRegistered(service_type)) {
return;
}
bool is_cleared = service_data_map_[service_type]->ClearServices();
VLOG(1) << "ServicesFlushed: is_cleared: " << is_cleared;
if (is_cleared)
DispatchApiEvent(service_type);
}
void DnsSdRegistry::DispatchApiEvent(const std::string& service_type) {
VLOG(1) << "DispatchApiEvent: service_type: " << service_type;
for (auto& observer : observers_) {
observer.OnDnsSdEvent(service_type,
service_data_map_[service_type]->GetServiceList());
}
}
bool DnsSdRegistry::IsRegistered(const std::string& service_type) {
return service_data_map_.find(service_type) != service_data_map_.end();
}
} // namespace extensions
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