mirror of
https://github.com/kidfromjupiter/nearby.git
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131 lines
4.9 KiB
C++
131 lines
4.9 KiB
C++
// Copyright 2022-2023 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_SHARING_INCOMING_FRAMES_READER_H_
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#define THIRD_PARTY_NEARBY_SHARING_INCOMING_FRAMES_READER_H_
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#include <stdint.h>
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#include <functional>
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#include <list>
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#include <memory>
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#include <optional>
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#include <queue>
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#include <vector>
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#include "absl/base/thread_annotations.h"
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#include "absl/functional/any_invocable.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/time.h"
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#include "internal/platform/task_runner.h"
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#include "sharing/nearby_connection.h"
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#include "sharing/proto/wire_format.pb.h"
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#include "sharing/thread_timer.h"
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namespace nearby {
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namespace sharing {
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// Helper class to read incoming frames from Nearby devices.
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class IncomingFramesReader
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: public std::enable_shared_from_this<IncomingFramesReader> {
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public:
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IncomingFramesReader(TaskRunner& service_thread,
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NearbyConnection* connection);
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virtual ~IncomingFramesReader();
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IncomingFramesReader(const IncomingFramesReader&) = delete;
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IncomingFramesReader& operator=(IncomingFramesReader&) = delete;
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// Reads an incoming frame from connection. `callback` is called
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// with the frame read from connection or nullopt if connection socket is
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// closed or timeout has occurred. If timeout has occurred, the `is_timeout`
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// parameter will be true. Set `timeout` to absl::ZeroDuration() to disable
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// timeout.
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//
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// Note: Callers are expected wait for `callback` to be run before scheduling
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// subsequent calls to ReadFrame(..).
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virtual void ReadFrame(
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absl::AnyInvocable<
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void(bool is_timeout,
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std::optional<nearby::sharing::service::proto::V1Frame>)>
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callback,
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absl::Duration timeout) ABSL_LOCKS_EXCLUDED(mutex_);
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// Reads a frame of type `frame_type` from `connection`. `callback` is called
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// with the frame read from connection or nullopt if connection socket is
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// closed or `timeout` units of time have passed. If timeout has occurred,
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// the `is_timeout` parameter will be true. Set `timeout` to
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// absl::ZeroDuration() to disable timeout.
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//
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// Note: Callers are expected wait for |callback| to be run before scheduling
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// subsequent calls to ReadFrame(..).
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virtual void ReadFrame(
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nearby::sharing::service::proto::V1Frame::FrameType frame_type,
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absl::AnyInvocable<
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void(bool is_timeout,
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std::optional<nearby::sharing::service::proto::V1Frame>)>
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callback,
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absl::Duration timeout) ABSL_LOCKS_EXCLUDED(mutex_);
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std::weak_ptr<IncomingFramesReader> GetWeakPtr() {
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return this->weak_from_this();
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}
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private:
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struct ReadFrameInfo {
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std::optional<nearby::sharing::service::proto::V1Frame::FrameType>
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frame_type = std::nullopt;
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absl::AnyInvocable<void(
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bool is_timeout,
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std::optional<nearby::sharing::service::proto::V1Frame>)>
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callback = nullptr;
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absl::Duration timeout = absl::ZeroDuration();
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};
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void ProcessReadRequest(
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std::optional<nearby::sharing::service::proto::V1Frame::FrameType>
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frame_type,
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absl::AnyInvocable<
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void(bool is_timeout,
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std::optional<nearby::sharing::service::proto::V1Frame>)>
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callback,
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absl::Duration timeout) ABSL_LOCKS_EXCLUDED(mutex_);
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void CloseAllPendingReads(bool is_timeout) ABSL_LOCKS_EXCLUDED(mutex_);
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void ReadNextFrame() ABSL_LOCKS_EXCLUDED(mutex_);
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void OnDataReadFromConnection(const std::vector<uint8_t>& bytes)
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ABSL_LOCKS_EXCLUDED(mutex_);
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void OnTimeout();
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void Done(std::unique_ptr<nearby::sharing::service::proto::V1Frame> frame)
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ABSL_LOCKS_EXCLUDED(mutex_);
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std::unique_ptr<nearby::sharing::service::proto::V1Frame> PopCachedFrame(
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std::optional<nearby::sharing::service::proto::V1Frame::FrameType>
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frame_type) ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
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TaskRunner& service_thread_;
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NearbyConnection* const connection_;
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absl::Mutex mutex_;
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std::queue<ReadFrameInfo> read_frame_info_queue_ ABSL_GUARDED_BY(mutex_);
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// Caches frames read from NearbyConnection which are not used immediately.
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std::list<std::unique_ptr<nearby::sharing::service::proto::V1Frame>>
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cached_frames_ ABSL_GUARDED_BY(mutex_);
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std::unique_ptr<ThreadTimer> timeout_timer_ ABSL_GUARDED_BY(mutex_);
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};
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} // namespace sharing
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_SHARING_INCOMING_FRAMES_READER_H_
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