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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/nearby_sharing/mdns/nearby_connections_mdns_manager.h"
#include <string>
#include "components/cross_device/logging/logging.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
namespace {
::sharing::mojom::NsdServiceInfoPtr ConvertNsdServiceInfo(
const local_discovery::ServiceDescription& service_description) {
::sharing::mojom::NsdServiceInfoPtr output =
::sharing::mojom::NsdServiceInfo::New();
// IP address is expected as bytes, rather than ToString().
auto ip_vec = service_description.ip_address.CopyBytesToVector();
output->ip_address = std::string(ip_vec.begin(), ip_vec.end());
output->port = service_description.address.port();
output->service_name = service_description.instance_name();
output->service_type = service_description.service_type();
CD_LOG(INFO, Feature::NS)
<< __func__ << " Found service: " << output->service_name
<< " for service_type: " << output->service_type
<< " with ip_address & port: " << output->ip_address.value() << ":"
<< output->port.value();
// Txt records contain important information like endpoint name.
for (const std::string& entry : service_description.metadata) {
const std::string_view key_value(entry);
const size_t equal_pos = key_value.find("=");
// We expect to find key/value pairs separated by an equals sign.
if (equal_pos == std::string_view::npos) {
continue;
}
std::string_view key = key_value.substr(0, equal_pos);
std::string_view value = key_value.substr(equal_pos + 1);
if (!output->txt_records) {
// Lazily construct the optional map the first time.
output->txt_records.emplace();
}
output->txt_records->insert_or_assign(key, value);
CD_LOG(INFO, Feature::NS)
<< __func__ << " TXT record: {" << key << ": " << value << "}";
}
return output;
}
} // namespace
namespace nearby::sharing {
NearbyConnectionsMdnsManager::NearbyConnectionsMdnsManager() {
CD_LOG(VERBOSE, Feature::NS) << __func__;
}
NearbyConnectionsMdnsManager::~NearbyConnectionsMdnsManager() {
CD_LOG(VERBOSE, Feature::NS) << __func__;
}
void NearbyConnectionsMdnsManager::StartDiscoverySession(
const std::string& service_type,
StartDiscoverySessionCallback callback) {
CD_LOG(INFO, Feature::NS)
<< __func__
<< " Starting mDNS discovery session for service_type:" << service_type;
if (base::Contains(device_listers_, service_type)) {
CD_LOG(INFO, Feature::NS)
<< __func__ << " Already discovering for this service type.";
std::move(callback).Run(true);
return;
}
// ServiceDiscoverySharedClient::GetInstance is thread protected, and
// calls from unit tests will come from the MainThread, causing a CHECK crash.
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
discovery_client_ =
local_discovery::ServiceDiscoverySharedClient::GetInstance();
auto lister = local_discovery::ServiceDiscoveryDeviceLister::Create(
this, discovery_client_.get(), service_type);
lister->Start();
lister->DiscoverNewDevices();
device_listers_[service_type] = std::move(lister);
std::move(callback).Run(true);
}
void NearbyConnectionsMdnsManager::StopDiscoverySession(
const std::string& service_type,
StopDiscoverySessionCallback callback) {
int num_erased = device_listers_.erase(service_type);
if (num_erased > 0) {
CD_LOG(INFO, Feature::NS)
<< __func__ << " Stopping mDNS discovery session for service_type: "
<< service_type;
std::move(callback).Run(true);
return;
}
CD_LOG(INFO, Feature::NS)
<< __func__ << " Failed to find service type to stop: " << service_type;
std::move(callback).Run(false);
}
void NearbyConnectionsMdnsManager::AddObserver(
::mojo::PendingRemote<::sharing::mojom::MdnsObserver> observer) {
CD_LOG(VERBOSE, Feature::NS) << __func__ << " Adding mDNS observer.";
observers_.Add(std::move(observer));
}
void NearbyConnectionsMdnsManager::OnDeviceChanged(
const std::string& service_type,
bool added,
const local_discovery::ServiceDescription& service_description) {
CD_LOG(VERBOSE, Feature::NS) << __func__ << " Device changed.";
// We expect the caller to handle new services, duplicate services,
// and services with updated information.
for (auto& observer : observers_) {
observer->ServiceFound(ConvertNsdServiceInfo(service_description));
}
}
void NearbyConnectionsMdnsManager::OnDeviceRemoved(
const std::string& service_type,
const std::string& service_name) {
CD_LOG(VERBOSE, Feature::NS) << __func__ << " Device removed.";
// We expect the caller to handle checking if the removed service
// was previously found or double-removed, etc.
::sharing::mojom::NsdServiceInfoPtr service_info =
::sharing::mojom::NsdServiceInfo::New();
// The returned service name is always of the form
// <service_name>.<service_type>, and we want just the first half.
service_info->service_name =
service_name.substr(0, service_name.find_first_of('.'));
service_info->service_type = service_type;
for (auto& observer : observers_) {
observer->ServiceLost(std::move(service_info));
}
}
void NearbyConnectionsMdnsManager::OnDeviceCacheFlushed(
const std::string& service_type) {
CD_LOG(VERBOSE, Feature::NS) << __func__ << " Device cache flushed.";
auto existing_lister = device_listers_.find(service_type);
CHECK(existing_lister != device_listers_.end());
// Request a new round of discovery from the lister.
existing_lister->second->DiscoverNewDevices();
return;
}
void NearbyConnectionsMdnsManager::SetDeviceListersForTesting(
std::map<std::string,
std::unique_ptr<local_discovery::ServiceDiscoveryDeviceLister>>*
device_listers) {
device_listers_.swap(*device_listers);
// Normally listers are started in StartDiscovery, but unit tests
// use fake service listers & run on the MainThread while StartDiscovery
// must be called on the UIThread.
for (auto& device_lister : device_listers_) {
device_lister.second->Start();
device_lister.second->DiscoverNewDevices();
}
}
} // namespace nearby::sharing
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