mirror of
https://github.com/kidfromjupiter/nearby.git
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Janusz Sobczak
02ffb5d45e
Define MessageStream class for exchanging messages betweek the seeker and the provider over rfcomm. PiperOrigin-RevId: 516986541
104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
// Copyright 2023 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_FASTPAIR_MESSAGE_STREAM_MEDIUM_H_
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#define THIRD_PARTY_NEARBY_FASTPAIR_MESSAGE_STREAM_MEDIUM_H_
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#include <functional>
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#include <memory>
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#include <optional>
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#include <string>
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#include <utility>
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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 "fastpair/common/fast_pair_device.h"
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#include "fastpair/message_stream/message.h"
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#include "internal/platform/bluetooth_classic.h"
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#include "internal/platform/future.h"
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#include "internal/platform/logging.h"
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#include "internal/platform/mutex.h"
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#include "internal/platform/single_thread_executor.h"
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namespace nearby {
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namespace fastpair {
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class Medium {
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public:
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class Observer {
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public:
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virtual ~Observer() = default;
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virtual void OnConnectionResult(absl::Status result) = 0;
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virtual void OnDisconnected(absl::Status reason) = 0;
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virtual void OnReceived(Message message) = 0;
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};
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Medium(const FastPairDevice& device,
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std::optional<BluetoothClassicMedium*> bt_classic, Observer& observer)
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: device_(device), bt_classic_medium_(bt_classic), observer_(observer) {}
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Medium(Medium&& other) = default;
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~Medium() {
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NEARBY_LOGS(INFO) << "Destructing FP Medium";
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cancellation_flag_.Cancel();
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if (socket_.IsValid()) {
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socket_.Close();
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}
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executor_.Shutdown();
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NEARBY_LOGS(INFO) << "Destructed FP Medium";
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}
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// Opens RFCOMM connection with the remote party.
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// Returns an error if a connection attempt could not be made.
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// Otherwise, `OnConnectionResult()` will be called with the connection
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// result. When the connection is successful, Medium starts processing
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// messages coming in from the remote party, and calls `OnReceived()` for each
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// complete message.
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absl::Status OpenRfcomm();
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// Opens L2CAP connection with the remote party.
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// Returns an error if a connection attempt could not be made.
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// Otherwise, `OnConnectionResult()` will be called with the connection
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// result. When the connection is successful, Medium starts processing
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// messages coming in from the remote party, and calls `OnReceived()` for each
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// complete message.
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absl::Status OpenL2cap(absl::string_view ble_address);
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absl::Status Disconnect();
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// Returns OK if the message was queued for delivery. It does not mean the
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// message was delivered to the remote party.
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absl::Status Send(Message message, bool compute_and_append_mac = false);
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private:
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void RunLoop(BluetoothSocket socket);
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ByteArray Serialize(Message message, bool compute_and_append_mac);
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void SetSocket(BluetoothSocket socket);
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void CloseSocket();
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BluetoothSocket GetSocket();
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const FastPairDevice& device_;
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std::optional<BluetoothClassicMedium*> bt_classic_medium_;
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Observer& observer_;
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BluetoothSocket socket_ ABSL_GUARDED_BY(mutex_);
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Mutex mutex_;
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CancellationFlag cancellation_flag_;
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SingleThreadExecutor executor_;
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};
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} // namespace fastpair
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_FASTPAIR_MESSAGE_STREAM_MEDIUM_H_
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