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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 "TraceBuffer.h"
#include <chrono>
#include <sstream>
#include <unistd.h>
#include <vector>
#include <inttypes.h>
#include "android-base/utf8.h"
#include "util/Files.h"
namespace aapt {
namespace tracebuffer {
namespace {
constexpr char kBegin = 'B';
constexpr char kEnd = 'E';
struct TracePoint {
char type;
pid_t tid;
int64_t time;
std::string tag;
};
std::vector<TracePoint> traces;
bool enabled = true;
constinit std::chrono::steady_clock::time_point startTime = {};
int64_t GetTime() noexcept {
auto now = std::chrono::steady_clock::now();
if (startTime == decltype(tracebuffer::startTime){}) {
startTime = now;
}
return std::chrono::duration_cast<std::chrono::microseconds>(now - startTime).count();
}
void AddWithTime(std::string tag, char type, int64_t time) noexcept {
TracePoint t = {type, getpid(), time, std::move(tag)};
traces.emplace_back(std::move(t));
}
void Add(std::string tag, char type) noexcept {
AddWithTime(std::move(tag), type, GetTime());
}
void Flush(const std::string& basePath) {
if (basePath.empty()) {
return;
}
BeginTrace(__func__); // We can't do much here, only record that it happened.
std::ostringstream s;
s << basePath << aapt::file::sDirSep << "report_aapt2_" << getpid() << ".json";
FILE* f = android::base::utf8::fopen(s.str().c_str(), "a");
if (f == nullptr) {
return;
}
// Wrap the trace in a JSON array [] to make Chrome/Perfetto UI handle it.
char delimiter = '[';
for (const TracePoint& trace : traces) {
fprintf(f,
"%c{\"ts\" : \"%" PRIu64
"\", \"ph\" : \"%c\", \"tid\" : \"%d\" , \"pid\" : \"%d\", \"name\" : \"%s\" }\n",
delimiter, trace.time, trace.type, 0, trace.tid, trace.tag.c_str());
delimiter = ',';
}
if (!traces.empty()) {
fprintf(f, "]");
}
fclose(f);
traces.clear();
}
} // namespace
} // namespace tracebuffer
void BeginTrace(std::string tag) {
if (!tracebuffer::enabled) return;
tracebuffer::Add(std::move(tag), tracebuffer::kBegin);
}
void EndTrace(std::string tag) {
if (!tracebuffer::enabled) return;
tracebuffer::Add(std::move(tag), tracebuffer::kEnd);
}
bool Trace::enable(bool value) {
return tracebuffer::enabled = value;
}
Trace::Trace(const char* tag) {
if (!tracebuffer::enabled) return;
tag_.assign(tag);
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
Trace::Trace(std::string tag) : tag_(std::move(tag)) {
if (!tracebuffer::enabled) return;
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
template <class SpanOfStrings>
std::string makeTag(std::string_view tag, const SpanOfStrings& args) {
std::ostringstream s;
s << tag;
if (!args.empty()) {
for (const auto& arg : args) {
s << ' ';
s << arg;
}
}
return std::move(s).str();
}
Trace::Trace(std::string_view tag, const std::vector<android::StringPiece>& args) {
if (!tracebuffer::enabled) return;
tag_ = makeTag(tag, args);
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
Trace::~Trace() {
if (!tracebuffer::enabled) return;
tracebuffer::Add(std::move(tag_), tracebuffer::kEnd);
}
FlushTrace::FlushTrace(std::string_view basepath, std::string_view tag) {
if (!Trace::enable(!basepath.empty())) return;
basepath_.assign(basepath);
tag_.assign(tag);
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
FlushTrace::FlushTrace(std::string_view basepath, std::string_view tag,
const std::vector<android::StringPiece>& args) {
if (!Trace::enable(!basepath.empty())) return;
basepath_.assign(basepath);
tag_ = makeTag(tag, args);
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
FlushTrace::FlushTrace(std::string_view basepath, std::string_view tag,
const std::vector<std::string>& args) {
if (!Trace::enable(!basepath.empty())) return;
basepath_.assign(basepath);
tag_ = makeTag(tag, args);
tracebuffer::Add(tag_, tracebuffer::kBegin);
}
FlushTrace::~FlushTrace() {
if (!tracebuffer::enabled) return;
tracebuffer::Add(std::move(tag_), tracebuffer::kEnd);
tracebuffer::Flush(basepath_);
}
} // namespace aapt
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