87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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* http://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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*/
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#include <array>
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#include <cstdint>
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#include <cstring>
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#include <memory>
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#include <utility>
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#include "android-base/logging.h"
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#include "wifilogd/main_loop.h"
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#include "wifilogd/protocol.h"
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namespace android {
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namespace wifilogd {
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namespace {
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constexpr auto kMainBufferSizeBytes = 128 * 1024;
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// TODO(b/32840641): Tune the sleep time.
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constexpr auto kTransientErrorSleepTimeNsec = 100 * 1000; // 100 usec
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}
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MainLoop::MainLoop(const std::string& socket_name)
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: MainLoop(socket_name, std::make_unique<Os>(),
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std::make_unique<CommandProcessor>(kMainBufferSizeBytes)) {}
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MainLoop::MainLoop(const std::string& socket_name, std::unique_ptr<Os> os,
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std::unique_ptr<CommandProcessor> command_processor)
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: os_(std::move(os)), command_processor_(std::move(command_processor)) {
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Os::Errno err;
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std::tie(sock_fd_, err) = os_->GetControlSocket(socket_name);
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if (err) {
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LOG(FATAL) << "Failed to get control socket: " << std::strerror(errno);
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}
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}
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void MainLoop::RunOnce() {
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std::array<uint8_t, protocol::kMaxMessageSize> input_buf;
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size_t datagram_len;
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Os::Errno err;
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std::tie(datagram_len, err) =
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os_->ReceiveDatagram(sock_fd_, input_buf.data(), input_buf.size());
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if (err) {
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ProcessError(err);
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return;
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}
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if (datagram_len > protocol::kMaxMessageSize) {
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// TODO(b/32098735): Increment stats counter.
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datagram_len = protocol::kMaxMessageSize;
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}
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command_processor_->ProcessCommand(input_buf.data(), datagram_len,
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Os::kInvalidFd);
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}
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// Private methods below.
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void MainLoop::ProcessError(Os::Errno err) {
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if (err == EINTR || err == ENOMEM) {
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// TODO(b/32098735): Increment stats counter.
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os_->Nanosleep(kTransientErrorSleepTimeNsec);
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return;
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}
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// Any other error is unexpected, and assumed to be non-recoverable.
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// (If, e.g., our socket is in a bad state, then we won't be able to receive
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// any new log messages.)
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LOG(FATAL) << "Unexpected error: " << std::strerror(err);
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}
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} // namespace wifilogd
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} // namespace android
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