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/*
* Copyright (C) 2017 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 "host/commands/kernel_log_monitor/kernel_log_server.h"
#include <map>
#include <utility>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <netinet/in.h>
#include "common/libs/fs/shared_select.h"
#include "host/libs/config/cuttlefish_config.h"
using cuttlefish::SharedFD;
namespace {
static const std::map<std::string, std::string> kInformationalPatterns = {
{"U-Boot ", "GUEST_UBOOT_VERSION: "},
{"] Linux version ", "GUEST_KERNEL_VERSION: "},
{"GUEST_BUILD_FINGERPRINT: ", "GUEST_BUILD_FINGERPRINT: "},
};
static const std::map<std::string, monitor::Event> kStageToEventMap = {
{cuttlefish::kBootStartedMessage, monitor::Event::BootStarted},
{cuttlefish::kBootCompletedMessage, monitor::Event::BootCompleted},
{cuttlefish::kBootFailedMessage, monitor::Event::BootFailed},
{cuttlefish::kMobileNetworkConnectedMessage,
monitor::Event::MobileNetworkConnected},
{cuttlefish::kWifiConnectedMessage, monitor::Event::WifiNetworkConnected},
{cuttlefish::kEthernetConnectedMessage, monitor::Event::EthernetNetworkConnected},
// TODO(b/131864854): Replace this with a string less likely to change
{"init: starting service 'adbd'...", monitor::Event::AdbdStarted},
{cuttlefish::kScreenChangedMessage, monitor::Event::ScreenChanged},
};
void ProcessSubscriptions(
Json::Value message,
std::vector<monitor::EventCallback>* subscribers) {
auto active_subscription_count = subscribers->size();
std::size_t idx = 0;
while (idx < active_subscription_count) {
// Call the callback
auto action = (*subscribers)[idx](message);
if (action == monitor::SubscriptionAction::ContinueSubscription) {
++idx;
} else {
// Cancel the subscription by swaping it with the last active subscription
// and decreasing the active subscription count
--active_subscription_count;
std::swap((*subscribers)[idx], (*subscribers)[active_subscription_count]);
}
}
// Keep only the active subscriptions
subscribers->resize(active_subscription_count);
}
} // namespace
namespace monitor {
KernelLogServer::KernelLogServer(cuttlefish::SharedFD pipe_fd,
const std::string& log_name,
bool deprecated_boot_completed)
: pipe_fd_(pipe_fd),
log_fd_(cuttlefish::SharedFD::Open(log_name.c_str(), O_CREAT | O_RDWR | O_APPEND, 0666)),
deprecated_boot_completed_(deprecated_boot_completed) {}
void KernelLogServer::BeforeSelect(cuttlefish::SharedFDSet* fd_read) const {
fd_read->Set(pipe_fd_);
}
void KernelLogServer::AfterSelect(const cuttlefish::SharedFDSet& fd_read) {
if (fd_read.IsSet(pipe_fd_)) {
HandleIncomingMessage();
}
}
void KernelLogServer::SubscribeToEvents(monitor::EventCallback callback) {
subscribers_.push_back(callback);
}
bool KernelLogServer::HandleIncomingMessage() {
const size_t buf_len = 256;
char buf[buf_len];
ssize_t ret = pipe_fd_->Read(buf, buf_len);
if (ret < 0) {
LOG(ERROR) << "Could not read kernel logs: " << pipe_fd_->StrError();
return false;
}
if (ret == 0) return false;
// Write the log to a file
if (log_fd_->Write(buf, ret) < 0) {
LOG(ERROR) << "Could not write kernel log to file: " << log_fd_->StrError();
return false;
}
// Detect VIRTUAL_DEVICE_BOOT_*
for (ssize_t i=0; i<ret; i++) {
if ('\n' == buf[i]) {
for (auto& info_kv : kInformationalPatterns) {
auto& match = info_kv.first;
auto& prefix = info_kv.second;
auto pos = line_.find(match);
if (std::string::npos != pos) {
LOG(INFO) << prefix << line_.substr(pos + match.size());
}
}
for (auto& stage_kv : kStageToEventMap) {
auto& stage = stage_kv.first;
auto event = stage_kv.second;
auto pos = line_.find(stage);
if (std::string::npos != pos) {
// Log the stage
LOG(INFO) << stage;
Json::Value message;
message["event"] = event;
Json::Value metadata;
// Expect space-separated key=value pairs in the log message.
const auto& fields = android::base::Split(
line_.substr(pos + stage.size()), " ");
for (std::string field : fields) {
field = android::base::Trim(field);
if (field.empty()) {
// Expected; android::base::Split() always returns at least
// one (possibly empty) string.
LOG(DEBUG) << "Empty field for line: " << line_;
continue;
}
const auto& keyvalue = android::base::Split(field, "=");
if (keyvalue.size() != 2) {
LOG(WARNING) << "Field is not in key=value format: " << field;
continue;
}
metadata[keyvalue[0]] = keyvalue[1];
}
message["metadata"] = metadata;
ProcessSubscriptions(message, &subscribers_);
//TODO(b/69417553) Remove this when our clients have transitioned to the
// new boot completed
if (deprecated_boot_completed_) {
// Write to host kernel log
FILE* log = popen("/usr/bin/sudo /usr/bin/tee /dev/kmsg", "w");
fprintf(log, "%s\n", stage.c_str());
fclose(log);
}
}
}
line_.clear();
}
line_.append(1, buf[i]);
}
return true;
}
} // namespace monitor
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