feat: [contentTracing] allow calling stopTracing() with no arguments (#18411)
This commit is contained in:
Jeremy Apthorp
GitHub
parent
1a609f0caf
commit
815b9d7707
6 changed files with 137 additions and 62 deletions
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@ -4,6 +4,7 @@
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#include <set>
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#include <string>
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#include <utility>
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#include "atom/common/native_mate_converters/callback.h"
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#include "atom/common/native_mate_converters/file_path_converter.h"
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@ -12,6 +13,7 @@
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#include "atom/common/promise_util.h"
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#include "base/bind.h"
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#include "base/files/file_util.h"
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#include "base/optional.h"
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#include "base/threading/thread_restrictions.h"
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#include "content/public/browser/tracing_controller.h"
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#include "native_mate/dictionary.h"
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@ -53,36 +55,44 @@ struct Converter<base::trace_event::TraceConfig> {
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namespace {
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using CompletionCallback = base::RepeatingCallback<void(const base::FilePath&)>;
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using CompletionCallback = base::OnceCallback<void(const base::FilePath&)>;
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scoped_refptr<TracingController::TraceDataEndpoint> GetTraceDataEndpoint(
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const base::FilePath& path,
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const CompletionCallback& callback) {
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base::FilePath result_file_path = path;
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// base::CreateTemporaryFile prevents blocking so we need to allow it
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// for now since offloading this to a different sequence would require
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// changing the api shape
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base::ThreadRestrictions::ScopedAllowIO allow_io;
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if (result_file_path.empty() && !base::CreateTemporaryFile(&result_file_path))
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LOG(ERROR) << "Creating temporary file failed";
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return TracingController::CreateFileEndpoint(
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result_file_path, base::BindRepeating(callback, result_file_path));
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base::Optional<base::FilePath> CreateTemporaryFileOnIO() {
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base::FilePath temp_file_path;
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if (!base::CreateTemporaryFile(&temp_file_path))
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return base::nullopt;
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return base::make_optional(std::move(temp_file_path));
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}
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v8::Local<v8::Promise> StopRecording(v8::Isolate* isolate,
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const base::FilePath& path) {
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atom::util::Promise promise(isolate);
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void StopTracing(atom::util::Promise promise,
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base::Optional<base::FilePath> file_path) {
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if (file_path) {
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auto endpoint = TracingController::CreateFileEndpoint(
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*file_path, base::AdaptCallbackForRepeating(base::BindOnce(
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&atom::util::Promise::ResolvePromise<base::FilePath>,
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std::move(promise), *file_path)));
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TracingController::GetInstance()->StopTracing(endpoint);
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} else {
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promise.RejectWithErrorMessage(
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"Failed to create temporary file for trace data");
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}
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}
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v8::Local<v8::Promise> StopRecording(mate::Arguments* args) {
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atom::util::Promise promise(args->isolate());
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v8::Local<v8::Promise> handle = promise.GetHandle();
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// TODO(zcbenz): Remove the use of CopyablePromise when the
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// CreateFileEndpoint API accepts OnceCallback.
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TracingController::GetInstance()->StopTracing(GetTraceDataEndpoint(
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path,
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base::BindRepeating(atom::util::CopyablePromise::ResolveCopyablePromise<
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const base::FilePath&>,
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atom::util::CopyablePromise(promise))));
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base::FilePath path;
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if (args->GetNext(&path) && !path.empty()) {
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StopTracing(std::move(promise), base::make_optional(path));
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} else {
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// use a temporary file.
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base::PostTaskWithTraitsAndReplyWithResult(
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FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
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base::BindOnce(CreateTemporaryFileOnIO),
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base::BindOnce(StopTracing, std::move(promise)));
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}
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return handle;
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}
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@ -104,10 +114,15 @@ v8::Local<v8::Promise> StartTracing(
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atom::util::Promise promise(isolate);
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v8::Local<v8::Promise> handle = promise.GetHandle();
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// Note: This method always succeeds.
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TracingController::GetInstance()->StartTracing(
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if (!TracingController::GetInstance()->StartTracing(
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trace_config, base::BindOnce(atom::util::Promise::ResolveEmptyPromise,
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std::move(promise)));
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std::move(promise)))) {
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// If StartTracing returns false, that means it didn't invoke its callback.
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// Return an already-resolved promise and abandon the previous promise (it
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// was std::move()d into the StartTracing callback and has been deleted by
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// this point).
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return atom::util::Promise::ResolvedPromise(isolate);
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}
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return handle;
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}
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@ -82,6 +82,21 @@ class Promise {
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}
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}
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// Returns an already-resolved promise.
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template <typename T>
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static v8::Local<v8::Promise> ResolvedPromise(v8::Isolate* isolate,
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T result) {
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Promise resolved(isolate);
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resolved.Resolve(result);
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return resolved.GetHandle();
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}
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static v8::Local<v8::Promise> ResolvedPromise(v8::Isolate* isolate) {
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Promise resolved(isolate);
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resolved.Resolve();
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return resolved.GetHandle();
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}
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v8::Local<v8::Promise> GetHandle() const;
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v8::Maybe<bool> Resolve() {
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@ -1,13 +1,11 @@
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# contentTracing
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> Collect tracing data from Chromium's content module for finding performance
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bottlenecks and slow operations.
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> Collect tracing data from Chromium to find performance bottlenecks and slow operations.
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Process: [Main](../glossary.md#main-process)
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This module does not include a web interface so you need to open
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`chrome://tracing/` in a Chrome browser and load the generated file to view the
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result.
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This module does not include a web interface. To view recorded traces, use
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[trace viewer][], available at `chrome://tracing` in Chrome.
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**Note:** You should not use this module until the `ready` event of the app
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module is emitted.
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@ -16,20 +14,15 @@ module is emitted.
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const { app, contentTracing } = require('electron')
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app.on('ready', () => {
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const options = {
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categoryFilter: '*',
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traceOptions: 'record-until-full,enable-sampling'
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}
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contentTracing.startRecording(options, () => {
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(async () => {
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await contentTracing.startRecording({
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include_categories: ['*']
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})
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console.log('Tracing started')
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setTimeout(() => {
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contentTracing.stopRecording('', (path) => {
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await new Promise(resolve => setTimeout(resolve, 5000))
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const path = await contentTracing.stopRecording()
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console.log('Tracing data recorded to ' + path)
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})
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}, 5000)
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})
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})()
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})
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```
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@ -41,11 +34,13 @@ The `contentTracing` module has the following methods:
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Returns `Promise<String[]>` - resolves with an array of category groups once all child processes have acknowledged the `getCategories` request
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Get a set of category groups. The category groups can change as new code paths are reached.
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Get a set of category groups. The category groups can change as new code paths
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are reached. See also the [list of built-in tracing
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categories](https://chromium.googlesource.com/chromium/src/+/master/base/trace_event/builtin_categories.h).
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### `contentTracing.startRecording(options)`
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* `options` ([TraceCategoriesAndOptions](structures/trace-categories-and-options.md) | [TraceConfig](structures/trace-config.md))
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* `options` ([TraceConfig](structures/trace-config.md) | [TraceCategoriesAndOptions](structures/trace-categories-and-options.md))
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Returns `Promise<void>` - resolved once all child processes have acknowledged the `startRecording` request.
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@ -54,22 +49,26 @@ Start recording on all processes.
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Recording begins immediately locally and asynchronously on child processes
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as soon as they receive the EnableRecording request.
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If a recording is already running, the promise will be immediately resolved, as
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only one trace operation can be in progress at a time.
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### `contentTracing.stopRecording(resultFilePath)`
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* `resultFilePath` String
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* `resultFilePath` String (optional)
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Returns `Promise<String>` - resolves with a file that contains the traced data once all child processes have acknowledged the `stopRecording` request
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Returns `Promise<String>` - resolves with a path to a file that contains the traced data once all child processes have acknowledged the `stopRecording` request
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Stop recording on all processes.
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Child processes typically cache trace data and only rarely flush and send
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trace data back to the main process. This helps to minimize the runtime overhead
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of tracing since sending trace data over IPC can be an expensive operation. So,
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to end tracing, we must asynchronously ask all child processes to flush any
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to end tracing, Chromium asynchronously asks all child processes to flush any
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pending trace data.
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Trace data will be written into `resultFilePath` if it is not empty or into a
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temporary file.
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Trace data will be written into `resultFilePath`. If `resultFilePath` is empty
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or not provided, trace data will be written to a temporary file, and the path
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will be returned in the promise.
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### `contentTracing.getTraceBufferUsage()`
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@ -77,3 +76,5 @@ Returns `Promise<Object>` - Resolves with an object containing the `value` and `
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Get the maximum usage across processes of trace buffer as a percentage of the
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full state.
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[trace viewer]: https://github.com/catapult-project/catapult/blob/master/tracing
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@ -1,9 +1,51 @@
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# TraceConfig Object
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* `included_categories` String[] (optional)
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* `excluded_categories` String[] (optional)
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* `memory_dump_config` Object (optional)
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* `recording_mode` String (optional) - one of "record-until-full" | "record-continuously" | "record-as-much-as-possible" | "trace-to-console". Defaults to "record-until-full".
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* `trace_buffer_size_in_kb` number (optional) - maximum size of the trace
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recording buffer in kilobytes. Defaults to 100MB.
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* `trace_buffer_size_in_events` number (optional) - maximum size of the trace
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recording buffer in events.
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* `enable_argument_filter` boolean (optional) - if true, filter event data
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according to a whitelist of events that have been manually vetted to not
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include any PII. See [the implementation in
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Chromium][trace_event_args_whitelist.cc] for specifics.
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* `included_categories` String[] (optional) - a list of tracing categories to
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include. Can include glob-like patterns using `*` at the end of the category
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name. See [tracing categories][] for the list of categories.
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* `excluded_categories` String[] (optional) - a list of tracing categories to
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exclude. Can include glob-like patterns using `*` at the end of the category
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name. See [tracing categories][] for the list of categories.
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* `included_process_ids` number[] (optional) - a list of process IDs to
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include in the trace. If not specified, trace all processes.
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* `histogram_names` String[] (optional) - a list of [histogram][] names to report
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with the trace.
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* `memory_dump_config` Object (optional) - if the
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`disabled-by-default-memory-infra` category is enabled, this contains
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optional additional configuration for data callection. See the [Chromium
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memory-infra docs][memory-infra docs] for more information.
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See an example in the [Chromium docs][1].
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An example TraceConfig that roughly matches what Chrome DevTools records:
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[1]: https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_infra_startup_tracing.md#the-advanced-way
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```js
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{
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recording_mode: 'record-until-full',
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included_categories: [
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'devtools.timeline',
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'disabled-by-default-devtools.timeline',
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'disabled-by-default-devtools.timeline.frame',
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'disabled-by-default-devtools.timeline.stack',
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'v8.execute',
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'blink.console',
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'blink.user_timing',
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'latencyInfo',
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'disabled-by-default-v8.cpu_profiler',
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'disabled-by-default-v8.cpu_profiler.hires'
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],
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excluded_categories: [ '*' ]
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}
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```
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[tracing categories]: https://chromium.googlesource.com/chromium/src/+/master/base/trace_event/builtin_categories.h
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[memory-infra docs]: https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_infra_startup_tracing.md#the-advanced-way
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[trace_event_args_whitelist.cc]: https://chromium.googlesource.com/chromium/src/+/master/services/tracing/public/cpp/trace_event_args_whitelist.cc
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[histogram]: https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histograms/README.md
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@ -1,5 +1,2 @@
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'use strict'
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const { deprecate } = require('electron')
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const contentTracing =
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module.exports = process.electronBinding('content_tracing')
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@ -132,5 +132,10 @@ describe('contentTracing', () => {
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const resultFilePath = await record(/* options */ {}, /* outputFilePath */ '')
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expect(resultFilePath).to.be.a('string').that.is.not.empty()
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})
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it('creates a temporary file when no path is passed', async function () {
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const resultFilePath = await record(/* options */ {}, /* outputFilePath */ undefined)
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expect(resultFilePath).to.be.a('string').that.is.not.empty()
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})
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})
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})
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