1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <array> 18 #include <cstdint> 19 #include <cstring> 20 #include <memory> 21 #include <utility> 22 23 #include "android-base/logging.h" 24 25 #include "wifilogd/main_loop.h" 26 #include "wifilogd/protocol.h" 27 28 namespace android { 29 namespace wifilogd { 30 31 namespace { 32 constexpr auto kMainBufferSizeBytes = 128 * 1024; 33 // TODO(b/32840641): Tune the sleep time. 34 constexpr auto kTransientErrorSleepTimeNsec = 100 * 1000; // 100 usec 35 } 36 37 MainLoop::MainLoop(const std::string& socket_name) 38 : MainLoop(socket_name, std::make_unique<Os>(), 39 std::make_unique<CommandProcessor>(kMainBufferSizeBytes)) {} 40 41 MainLoop::MainLoop(const std::string& socket_name, std::unique_ptr<Os> os, 42 std::unique_ptr<CommandProcessor> command_processor) 43 : os_(std::move(os)), command_processor_(std::move(command_processor)) { 44 Os::Errno err; 45 std::tie(sock_fd_, err) = os_->GetControlSocket(socket_name); 46 if (err) { 47 LOG(FATAL) << "Failed to get control socket: " << std::strerror(errno); 48 } 49 } 50 51 void MainLoop::RunOnce() { 52 std::array<uint8_t, protocol::kMaxMessageSize> input_buf; 53 size_t datagram_len; 54 Os::Errno err; 55 std::tie(datagram_len, err) = 56 os_->ReceiveDatagram(sock_fd_, input_buf.data(), input_buf.size()); 57 if (err) { 58 ProcessError(err); 59 return; 60 } 61 62 if (datagram_len > protocol::kMaxMessageSize) { 63 // TODO(b/32098735): Increment stats counter. 64 datagram_len = protocol::kMaxMessageSize; 65 } 66 67 command_processor_->ProcessCommand(input_buf.data(), datagram_len, 68 Os::kInvalidFd); 69 } 70 71 // Private methods below. 72 73 void MainLoop::ProcessError(Os::Errno err) { 74 if (err == EINTR || err == ENOMEM) { 75 // TODO(b/32098735): Increment stats counter. 76 os_->Nanosleep(kTransientErrorSleepTimeNsec); 77 return; 78 } 79 80 // Any other error is unexpected, and assumed to be non-recoverable. 81 // (If, e.g., our socket is in a bad state, then we won't be able to receive 82 // any new log messages.) 83 LOG(FATAL) << "Unexpected error: " << std::strerror(err); 84 } 85 86 } // namespace wifilogd 87 } // namespace android 88
