| // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "login_manager/liveness_checker_impl.h" |
| |
| #include <signal.h> |
| #include <string> |
| #include <vector> |
| |
| #include <base/bind.h> |
| #include <base/callback.h> |
| #include <base/cancelable_callback.h> |
| #include <base/compiler_specific.h> |
| #include <base/location.h> |
| #include <base/logging.h> |
| #include <base/memory/weak_ptr.h> |
| #include <base/process/launch.h> |
| #include <base/strings/string_split.h> |
| #include <base/strings/string_util.h> |
| #include <base/time/time.h> |
| #include <brillo/message_loops/message_loop.h> |
| #include <chromeos/dbus/service_constants.h> |
| #include <dbus/message.h> |
| #include <dbus/object_proxy.h> |
| |
| #include "login_manager/login_metrics.h" |
| #include "login_manager/process_manager_service_interface.h" |
| |
| namespace login_manager { |
| |
| LivenessCheckerImpl::LivenessCheckerImpl( |
| ProcessManagerServiceInterface* manager, |
| dbus::ObjectProxy* dbus_proxy, |
| bool enable_aborting, |
| base::TimeDelta interval, |
| LoginMetrics* metrics) |
| : manager_(manager), |
| dbus_proxy_(dbus_proxy), |
| enable_aborting_(enable_aborting), |
| interval_(interval), |
| metrics_(metrics) {} |
| |
| LivenessCheckerImpl::~LivenessCheckerImpl() { |
| Stop(); |
| } |
| |
| void LivenessCheckerImpl::Start() { |
| Stop(); // To be certain. |
| last_ping_acked_ = true; |
| liveness_check_.Reset( |
| base::Bind(&LivenessCheckerImpl::CheckAndSendLivenessPing, |
| weak_ptr_factory_.GetWeakPtr(), interval_)); |
| brillo::MessageLoop::current()->PostDelayedTask( |
| FROM_HERE, liveness_check_.callback(), interval_); |
| } |
| |
| void LivenessCheckerImpl::Stop() { |
| weak_ptr_factory_.InvalidateWeakPtrs(); |
| liveness_check_.Cancel(); |
| } |
| |
| bool LivenessCheckerImpl::IsRunning() { |
| return !liveness_check_.IsCancelled(); |
| } |
| |
| void LivenessCheckerImpl::DisableAborting() { |
| enable_aborting_ = false; |
| } |
| |
| void LivenessCheckerImpl::CheckAndSendLivenessPing(base::TimeDelta interval) { |
| // If there's an un-acked ping, the browser needs to be taken down. |
| if (!last_ping_acked_) { |
| LOG(WARNING) << "Browser hang detected!"; |
| |
| // TODO(https://crbug.com/883029): Remove. |
| std::string top_output; |
| base::GetAppOutput({"top", "-b", "-c", "-n1", "-w512"}, &top_output); |
| |
| std::vector<std::string> top_output_lines = base::SplitString( |
| top_output, "\n", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY); |
| if (top_output_lines.size() > 20) |
| top_output_lines.resize(20); |
| top_output = base::JoinString(top_output_lines, "\n"); |
| |
| LOG(WARNING) << "Top output (trimmed):"; |
| LOG(WARNING) << top_output; |
| |
| if (enable_aborting_) { |
| // Note: If this log message is changed, the desktopui_HangDetector |
| // autotest must be updated. |
| LOG(WARNING) << "Aborting browser process."; |
| |
| manager_->AbortBrowserForHang(); |
| // HandleChildExit() will reap the process and restart if needed. |
| Stop(); |
| return; |
| } |
| } |
| |
| DVLOG(1) << "Sending a liveness ping to the browser."; |
| last_ping_acked_ = false; |
| ping_sent_ = base::TimeTicks::Now(); |
| dbus::MethodCall ping(chromeos::kLivenessServiceInterface, |
| chromeos::kLivenessServiceCheckLivenessMethod); |
| // TODO(crbug/1286683): The timeout here is out of sync with |interval|. This |
| // should probably be updated to use |interval| instead, and then it makes |
| // sense to cancel any previous invocations liveness check invocations that |
| // might still be pending for whatever reason. |
| // |
| // At the time of writing this, there's an ongoing investigation into Chrome |
| // hangs, so the above changes need to wait until this is resolved in order to |
| // avoid disturbing data collection. |
| dbus_proxy_->CallMethod(&ping, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT, |
| base::Bind(&LivenessCheckerImpl::HandleAck, |
| weak_ptr_factory_.GetWeakPtr())); |
| |
| DVLOG(1) << "Scheduling liveness check in " << interval.InSeconds() << "s."; |
| liveness_check_.Reset( |
| base::Bind(&LivenessCheckerImpl::CheckAndSendLivenessPing, |
| weak_ptr_factory_.GetWeakPtr(), interval)); |
| brillo::MessageLoop::current()->PostDelayedTask( |
| FROM_HERE, liveness_check_.callback(), interval); |
| } |
| |
| void LivenessCheckerImpl::HandleAck(dbus::Response* response) { |
| last_ping_acked_ = (response != nullptr); |
| if (response != nullptr) { |
| base::TimeDelta ping_response_time = base::TimeTicks::Now() - ping_sent_; |
| metrics_->SendLivenessPingResponseTime(ping_response_time); |
| } |
| } |
| |
| } // namespace login_manager |