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87 lines
2.6 KiB
87 lines
2.6 KiB
/* |
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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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