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https://github.com/kidfromjupiter/nearby.git
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106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_BROADCAST_MANAGER_H_
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#define THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_BROADCAST_MANAGER_H_
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/base/thread_annotations.h"
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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#include "internal/platform/single_thread_executor.h"
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#include "internal/proto/credential.pb.h"
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#include "presence/broadcast_request.h"
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#include "presence/data_types.h"
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#include "presence/implementation/base_broadcast_request.h"
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#include "presence/implementation/credential_manager.h"
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#include "presence/implementation/mediums/mediums.h"
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namespace nearby {
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namespace presence {
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// The instance of BroadcastManager is owned by {@code ServiceControllerImpl}.
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// Helping service controller to manage broadcast requests and callbacks.
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class BroadcastManager {
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public:
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using SingleThreadExecutor = ::nearby::SingleThreadExecutor;
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using AdvertisingSession =
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::nearby::api::ble_v2::BleMedium::AdvertisingSession;
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using Runnable = ::nearby::Runnable;
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using LocalCredential = internal::LocalCredential;
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BroadcastManager(Mediums& mediums, CredentialManager& credential_manager,
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SingleThreadExecutor& executor) {
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mediums_ = &mediums, credential_manager_ = &credential_manager,
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executor_ = &executor;
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}
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~BroadcastManager() = default;
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absl::StatusOr<BroadcastSessionId> StartBroadcast(
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BroadcastRequest broadcast_request, BroadcastCallback callback);
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void StopBroadcast(BroadcastSessionId);
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private:
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Mediums* mediums_;
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CredentialManager* credential_manager_;
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SingleThreadExecutor* executor_;
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class BroadcastSessionState {
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public:
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explicit BroadcastSessionState(BroadcastCallback broadcast_callback,
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PowerMode power_mode)
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: broadcast_callback_(std::move(broadcast_callback)),
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power_mode_(power_mode) {}
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void SetAdvertisingSession(std::unique_ptr<AdvertisingSession> session);
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void CallStartedCallback(absl::Status status);
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void StopAdvertising();
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PowerMode GetPowerMode() { return power_mode_; }
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private:
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BroadcastCallback broadcast_callback_;
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PowerMode power_mode_;
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std::unique_ptr<AdvertisingSession> advertising_session_;
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};
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BroadcastSessionId GenerateBroadcastSessionId();
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void NotifyStartCallbackStatus(BroadcastSessionId id, absl::Status status);
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void RunOnServiceControllerThread(absl::string_view name, Runnable runnable) {
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executor_->Execute(std::string(name), std::move(runnable));
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}
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void FetchCredentials(BroadcastSessionId id,
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BaseBroadcastRequest broadcast_request)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(*executor_);
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absl::optional<LocalCredential> SelectCredential(
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BaseBroadcastRequest& broadcast_request,
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std::vector<LocalCredential> credentials);
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// Returns the private credential, if any, selected to generate the
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// advertisement. A salt used in the advertisement is added to the returned
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// private credential. The caller must save it in the storage.
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absl::optional<LocalCredential> Advertise(
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BroadcastSessionId id, BaseBroadcastRequest broadcast_request,
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std::vector<LocalCredential> credentials)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(*executor_);
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absl::flat_hash_map<BroadcastSessionId, BroadcastSessionState> sessions_
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ABSL_GUARDED_BY(*executor_);
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};
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} // namespace presence
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_BROADCAST_MANAGER_H_
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