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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <array>
#include <cstdint>
#include <cstring>
#include <memory>
#include <utility>
#include "android-base/logging.h"
#include "wifilogd/main_loop.h"
#include "wifilogd/protocol.h"
namespace android {
namespace wifilogd {
namespace {
constexpr auto kMainBufferSizeBytes = 128 * 1024;
// TODO(b/32840641): Tune the sleep time.
constexpr auto kTransientErrorSleepTimeNsec = 100 * 1000; // 100 usec
}
MainLoop::MainLoop(const std::string& socket_name)
: MainLoop(socket_name, std::make_unique<Os>(),
std::make_unique<CommandProcessor>(kMainBufferSizeBytes)) {}
MainLoop::MainLoop(const std::string& socket_name, std::unique_ptr<Os> os,
std::unique_ptr<CommandProcessor> command_processor)
: os_(std::move(os)), command_processor_(std::move(command_processor)) {
Os::Errno err;
std::tie(sock_fd_, err) = os_->GetControlSocket(socket_name);
if (err) {
PLOG(FATAL) << "Failed to get control socket";
}
}
void MainLoop::RunOnce() {
std::array<uint8_t, protocol::kMaxMessageSize> input_buf;
size_t datagram_len;
Os::Errno err;
std::tie(datagram_len, err) =
os_->ReceiveDatagram(sock_fd_, input_buf.data(), input_buf.size());
if (err) {
ProcessError(err);
return;
}
if (datagram_len > protocol::kMaxMessageSize) {
// TODO(b/32098735): Increment stats counter.
datagram_len = protocol::kMaxMessageSize;
}
command_processor_->ProcessCommand(input_buf.data(), datagram_len,
Os::kInvalidFd);
}
// Private methods below.
void MainLoop::ProcessError(Os::Errno err) {
if (err == EINTR || err == ENOMEM) {
// TODO(b/32098735): Increment stats counter.
os_->Nanosleep(kTransientErrorSleepTimeNsec);
return;
}
// Any other error is unexpected, and assumed to be non-recoverable.
// (If, e.g., our socket is in a bad state, then we won't be able to receive
// any new log messages.)
PLOG(FATAL) << "Unexpected error";
}
} // namespace wifilogd
} // namespace android
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