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/*
* Copyright (C) 2019 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 "perfetto/tracing/track.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/hash.h"
#include "perfetto/ext/base/scoped_file.h"
#include "perfetto/ext/base/string_splitter.h"
#include "perfetto/ext/base/string_utils.h"
#include "perfetto/ext/base/thread_utils.h"
#include "perfetto/ext/base/uuid.h"
#include "perfetto/tracing/internal/track_event_data_source.h"
#include "protos/perfetto/trace/track_event/counter_descriptor.gen.h"
#include "protos/perfetto/trace/track_event/process_descriptor.gen.h"
#include "protos/perfetto/trace/track_event/process_descriptor.pbzero.h"
#include "protos/perfetto/trace/track_event/thread_descriptor.gen.h"
#include "protos/perfetto/trace/track_event/thread_descriptor.pbzero.h"
namespace perfetto {
// static
uint64_t Track::process_uuid;
protos::gen::TrackDescriptor Track::Serialize() const {
protos::gen::TrackDescriptor desc;
desc.set_uuid(uuid);
if (parent_uuid)
desc.set_parent_uuid(parent_uuid);
return desc;
}
void Track::Serialize(protos::pbzero::TrackDescriptor* desc) const {
auto bytes = Serialize().SerializeAsString();
desc->AppendRawProtoBytes(bytes.data(), bytes.size());
}
protos::gen::TrackDescriptor ProcessTrack::Serialize() const {
auto desc = Track::Serialize();
auto pd = desc.mutable_process();
pd->set_pid(static_cast<int32_t>(pid));
#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
std::string cmdline;
if (base::ReadFile("/proc/self/cmdline", &cmdline)) {
// Since cmdline is a zero-terminated list of arguments, this ends up
// writing just the first element, i.e., the process name, into the process
// name field.
pd->set_process_name(cmdline.c_str());
base::StringSplitter splitter(std::move(cmdline), '\0');
while (splitter.Next()) {
pd->add_cmdline(
std::string(splitter.cur_token(), splitter.cur_token_size()));
}
}
// TODO(skyostil): Record command line on Windows and Mac.
#endif
return desc;
}
void ProcessTrack::Serialize(protos::pbzero::TrackDescriptor* desc) const {
auto bytes = Serialize().SerializeAsString();
desc->AppendRawProtoBytes(bytes.data(), bytes.size());
}
protos::gen::TrackDescriptor ThreadTrack::Serialize() const {
auto desc = Track::Serialize();
auto td = desc.mutable_thread();
td->set_pid(static_cast<int32_t>(pid));
td->set_tid(static_cast<int32_t>(tid));
std::string thread_name;
if (base::GetThreadName(thread_name))
td->set_thread_name(thread_name);
return desc;
}
void ThreadTrack::Serialize(protos::pbzero::TrackDescriptor* desc) const {
auto bytes = Serialize().SerializeAsString();
desc->AppendRawProtoBytes(bytes.data(), bytes.size());
}
protos::gen::TrackDescriptor CounterTrack::Serialize() const {
auto desc = Track::Serialize();
desc.set_name(name_);
auto* counter = desc.mutable_counter();
if (category_)
counter->add_categories(category_);
if (unit_ != perfetto::protos::pbzero::CounterDescriptor::UNIT_UNSPECIFIED)
counter->set_unit(static_cast<protos::gen::CounterDescriptor_Unit>(unit_));
if (unit_name_)
counter->set_unit_name(unit_name_);
if (unit_multiplier_ != 1)
counter->set_unit_multiplier(unit_multiplier_);
if (is_incremental_)
counter->set_is_incremental(is_incremental_);
return desc;
}
void CounterTrack::Serialize(protos::pbzero::TrackDescriptor* desc) const {
auto bytes = Serialize().SerializeAsString();
desc->AppendRawProtoBytes(bytes.data(), bytes.size());
}
namespace internal {
namespace {
uint64_t GetProcessStartTime() {
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
std::string stat;
if (!base::ReadFile("/proc/self/stat", &stat))
return 0u;
// The stat file is a single line split into space-separated fields as "pid
// (comm) state ppid ...". However because the command name can contain any
// characters (including parentheses and spaces), we need to skip past it
// before parsing the rest of the fields. To do that, we look for the last
// instance of ") " (parentheses followed by space) and parse forward from
// that point.
size_t comm_end = stat.rfind(") ");
if (comm_end == std::string::npos)
return 0u;
stat = stat.substr(comm_end + strlen(") "));
base::StringSplitter splitter(stat, ' ');
for (size_t skip = 0; skip < 20; skip++) {
if (!splitter.Next())
return 0u;
}
return base::CStringToUInt64(splitter.cur_token()).value_or(0u);
#else
return 0;
#endif // !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
}
} // namespace
// static
TrackRegistry* TrackRegistry::instance_;
TrackRegistry::TrackRegistry() = default;
TrackRegistry::~TrackRegistry() = default;
// static
void TrackRegistry::InitializeInstance() {
// TODO(eseckler): Chrome may call this more than once. Once Chrome doesn't
// call this directly anymore, bring back DCHECK(!instance_) instead.
if (instance_)
return;
instance_ = new TrackRegistry();
// Use the process start time + pid as the unique identifier for this process.
// This ensures that if there are two independent copies of the Perfetto SDK
// in the same process (e.g., one in the app and another in a system
// framework), events emitted by each will be consistently interleaved on
// common thread and process tracks.
if (uint64_t start_time = GetProcessStartTime()) {
base::Hash hash;
hash.Update(start_time);
hash.Update(base::GetProcessId());
Track::process_uuid = hash.digest();
} else {
// Fall back to a randomly generated identifier.
Track::process_uuid = static_cast<uint64_t>(base::Uuidv4().lsb());
}
}
void TrackRegistry::UpdateTrack(Track track,
const std::string& serialized_desc) {
std::lock_guard<std::mutex> lock(mutex_);
tracks_[track.uuid] = std::move(serialized_desc);
}
void TrackRegistry::UpdateTrackImpl(
Track track,
std::function<void(protos::pbzero::TrackDescriptor*)> fill_function) {
constexpr size_t kInitialSliceSize = 32;
constexpr size_t kMaximumSliceSize = 4096;
protozero::HeapBuffered<protos::pbzero::TrackDescriptor> new_descriptor(
kInitialSliceSize, kMaximumSliceSize);
fill_function(new_descriptor.get());
auto serialized_desc = new_descriptor.SerializeAsString();
UpdateTrack(track, serialized_desc);
}
void TrackRegistry::EraseTrack(Track track) {
std::lock_guard<std::mutex> lock(mutex_);
tracks_.erase(track.uuid);
}
// static
void TrackRegistry::WriteTrackDescriptor(
const SerializedTrackDescriptor& desc,
protozero::MessageHandle<protos::pbzero::TracePacket> packet) {
packet->AppendString(
perfetto::protos::pbzero::TracePacket::kTrackDescriptorFieldNumber, desc);
}
} // namespace internal
} // namespace perfetto
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