mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-09-19 11:09:05 +01:00
126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ObjectIntrospection.h>
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#include <atomic>
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#include <chrono>
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#include <fstream>
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#include <functional>
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#include <mutex>
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#include <string>
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#include <vector>
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namespace Metrics {
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enum ArgTiming {
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ENTRY,
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EXIT,
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};
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class Metrics {
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friend class Tracing;
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public:
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Metrics(ObjectIntrospection::options opts, const std::string& savePath);
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~Metrics();
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void enable() {
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enableAll = true;
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}
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private:
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static std::atomic<Metrics*> singleton;
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ObjectIntrospection::options opts;
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std::fstream writer;
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std::mutex writerLock;
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bool hasWritten = false;
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bool enableAll = false;
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static ObjectIntrospection::options& getOptions() {
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return singleton.load()->opts;
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}
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static bool isEnabled() {
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return singleton.load()->enableAll;
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}
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static void save(std::string object);
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static void saveArg(const char* name,
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const char* argName,
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ArgTiming timing,
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size_t size);
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static void saveDuration(const char* name,
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std::chrono::milliseconds duration);
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};
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class Tracing {
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public:
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Tracing(const char* name, bool enabled = false);
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~Tracing();
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void start();
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template <class T>
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void registerArg(const char* argName, T* value);
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private:
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bool isTimingEnabled();
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bool isArgEnabled(const char* argName, ArgTiming timing);
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void saveArg(const char* argName, ArgTiming timing, size_t size);
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void saveDuration(std::chrono::milliseconds duration);
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template <class T>
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void inspectArg(const char* argName, ArgTiming timing, T* value);
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const char* name;
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bool enabled;
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std::chrono::high_resolution_clock::time_point startTime;
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std::vector<std::function<void()>> exitFuncs;
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};
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template <class T>
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void Tracing::registerArg(const char* argName, T* value) {
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if (isArgEnabled(argName, ArgTiming::ENTRY)) {
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inspectArg(argName, ArgTiming::ENTRY, value);
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}
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if (isArgEnabled(argName, ArgTiming::EXIT)) {
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if (exitFuncs.capacity() == 0)
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exitFuncs.reserve(8);
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std::function<void()> exitFunc = [this, argName, value]() {
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inspectArg(argName, ArgTiming::EXIT, value);
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};
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exitFuncs.push_back(exitFunc);
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}
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}
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template <class T>
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void Tracing::inspectArg(const char* argName, ArgTiming timing, T* value) {
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size_t size;
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if (int responseCode = ObjectIntrospection::getObjectSize(
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value, &size, Metrics::getOptions(), false);
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responseCode > ObjectIntrospection::Response::OIL_INITIALISING) {
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throw std::runtime_error("object introspection failed");
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} else if (responseCode == ObjectIntrospection::Response::OIL_INITIALISING) {
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return; // do nothing to avoid blocking
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}
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saveArg(argName, timing, size);
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}
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} // namespace Metrics
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