mirror of
https://github.com/kidfromjupiter/nearby.git
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124 lines
3.6 KiB
C++
124 lines
3.6 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 PLATFORM_IMPL_LINUX_BLUETOOTH_SOCKET_H_
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#define PLATFORM_IMPL_LINUX_BLUETOOTH_SOCKET_H_
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#include <atomic>
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#include <memory>
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#include <optional>
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#include <sdbus-c++/Types.h>
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#include <sys/poll.h>
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#include <systemd/sd-bus.h>
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#include "absl/synchronization/mutex.h"
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#include "internal/platform/exception.h"
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#include "internal/platform/implementation/bluetooth_classic.h"
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#include "internal/platform/implementation/linux/bluetooth_classic_device.h"
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#include "internal/platform/input_stream.h"
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#include "internal/platform/output_stream.h"
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namespace nearby {
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namespace linux {
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// BlueZ's NewConnection gives us a non-blocking FD, so we need to poll
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// it to be able to write/read bytes.
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class Poller final {
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public:
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static Poller CreateInputPoller(const sdbus::UnixFd &fd) {
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return Poller(fd, POLLIN);
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}
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static Poller CreateOutputPoller(const sdbus::UnixFd &fd) {
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return Poller(fd, POLLOUT);
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}
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static Poller CreateInputPoller(int fd) { return Poller(fd, POLLIN); }
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static Poller CreateOutputPoller(int fd) { return Poller(fd, POLLOUT); }
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Exception Ready();
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private:
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Poller(const sdbus::UnixFd &fd, short event) : poll_event_(event) {
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fds_[0].fd = fd.get();
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fds_[0].events = event;
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}
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Poller(int fd, short event) : poll_event_(event) {
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fds_[0].fd = fd;
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fds_[0].events = event;
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}
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short poll_event_;
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struct pollfd fds_[1];
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};
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class BluetoothInputStream final : public nearby::InputStream {
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public:
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explicit BluetoothInputStream(sdbus::UnixFd fd)
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: fd_(std::move(fd)), fd_raw_(fd_.get()) {}
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ExceptionOr<ByteArray> Read(std::int64_t size) override;
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Exception Close() override;
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private:
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sdbus::UnixFd fd_;
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std::atomic<int> fd_raw_{-1};
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};
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class BluetoothOutputStream : public nearby::OutputStream {
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public:
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explicit BluetoothOutputStream(sdbus::UnixFd fd)
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: fd_(std::move(fd)), fd_raw_(fd_.get()) {}
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Exception Write(absl::string_view data) override;
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Exception Flush() override { return {Exception::kSuccess}; }
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Exception Close() override;
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private:
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mutable absl::Mutex fd_mutex_;
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sdbus::UnixFd fd_;
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std::atomic<int> fd_raw_{-1};
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// For packet sockets, discovered max payload per send/write.
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// 0 means "unknown", we’ll initialize on first packet write.
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size_t max_chunk_ ABSL_GUARDED_BY(fd_mutex_) = 0;
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};
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class BluetoothSocket final : public api::BluetoothSocket {
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public:
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BluetoothSocket(std::shared_ptr<BluetoothDevice> device,
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const sdbus::UnixFd &fd)
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: device_(std::move(device)), output_stream_(fd), input_stream_(fd) {}
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nearby::InputStream &GetInputStream() override { return input_stream_; }
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nearby::OutputStream &GetOutputStream() override { return output_stream_; }
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Exception Close() override {
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input_stream_.Close();
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output_stream_.Close();
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return Exception{Exception::kSuccess};
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}
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api::BluetoothDevice *GetRemoteDevice() override { return device_.get(); };
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private:
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std::shared_ptr<BluetoothDevice> device_;
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BluetoothOutputStream output_stream_;
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BluetoothInputStream input_stream_;
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};
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} // namespace linux
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} // namespace nearby
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#endif
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