feat: promisify contentTracing.getCategories() (#16583)

* feat: promisify contentTracing.getCategories()

* deprecate contentTracing/getCategories

atom/browser/api/atom_api_content_tracing.cc

@@ -8,6 +8,7 @@
 #include "atom/common/native_mate_converters/callback.h"
 #include "atom/common/native_mate_converters/file_path_converter.h"
 #include "atom/common/native_mate_converters/value_converter.h"
+#include "atom/common/promise_util.h"
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "content/public/browser/tracing_controller.h"
@@ -71,11 +72,20 @@ void StopRecording(const base::FilePath& path,
       GetTraceDataEndpoint(path, callback));
 }
 
-bool GetCategories(
-    const base::RepeatingCallback<void(const std::set<std::string>&)>&
-        callback) {
-  return TracingController::GetInstance()->GetCategories(
-      base::BindOnce(callback));
+void OnCategoriesAvailable(scoped_refptr<atom::util::Promise> promise,
+                           const std::set<std::string>& categories) {
+  promise->Resolve(categories);
+}
+
+v8::Local<v8::Promise> GetCategories(v8::Isolate* isolate) {
+  scoped_refptr<atom::util::Promise> promise = new atom::util::Promise(isolate);
+  bool success = TracingController::GetInstance()->GetCategories(
+      base::BindOnce(&OnCategoriesAvailable, promise));
+
+  if (!success)
+    promise->RejectWithErrorMessage("Could not get categories.");
+
+  return promise->GetHandle();
 }
 
 bool StartTracing(const base::trace_event::TraceConfig& trace_config,

docs/api/content-tracing.md

@@ -43,11 +43,18 @@ The `contentTracing` module has the following methods:
 * `callback` Function
   * `categories` String[]
 
-Get a set of category groups. The category groups can change as new code paths
-are reached.
+Get a set of category groups. The category groups can change as new code paths are reached.
+
+Once all child processes have acknowledged the `getCategories` request the `callback` is invoked with an array of category groups.
+
+**[Deprecated Soon](promisification.md)**
+
+### `contentTracing.getCategories()`
+
+Returns `Promise<String[]>` - resolves with an array of category groups once all child processes have acknowledged the `getCategories` request
+
+Get a set of category groups. The category groups can change as new code paths are reached.
 
-Once all child processes have acknowledged the `getCategories` request the
-`callback` is invoked with an array of category groups.
 
 ### `contentTracing.startRecording(options, callback)`
 

docs/api/promisification.md

@@ -11,7 +11,6 @@ When a majority of affected functions are migrated, this flag will be enabled by
 - [app.importCertificate(options, callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#importCertificate)
 - [request.write(chunk[, encoding][, callback])](https://github.com/electron/electron/blob/master/docs/api/client-request.md#write)
 - [request.end([chunk][, encoding][, callback])](https://github.com/electron/electron/blob/master/docs/api/client-request.md#end)
-- [contentTracing.getCategories(callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#getCategories)
 - [contentTracing.startRecording(options, callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#startRecording)
 - [contentTracing.stopRecording(resultFilePath, callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#stopRecording)
 - [contentTracing.getTraceBufferUsage(callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#getTraceBufferUsage)
@@ -45,6 +44,7 @@ When a majority of affected functions are migrated, this flag will be enabled by
 
 - [app.getFileIcon(path[, options], callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#getFileIcon)
 - [contents.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#capturePage)
+- [contentTracing.getCategories(callback)](https://github.com/electron/electron/blob/master/docs/api/content-tracing.md#getCategories)
 - [cookies.flushStore(callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#flushStore)
 - [cookies.get(filter, callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#get)
 - [cookies.remove(url, name, callback)](https://github.com/electron/electron/blob/master/docs/api/cookies.md#remove)

lib/browser/api/content-tracing.js

@@ -1,3 +1,7 @@
 'use strict'
+const { deprecate } = require('electron')
+const contentTracing = process.atomBinding('content_tracing')
 
-module.exports = process.atomBinding('content_tracing')
+contentTracing.getCategories = deprecate.promisify(contentTracing.getCategories)
+
+module.exports = contentTracing