feat: promisify ses.clearHostResolverCache() (#17229)

atom/browser/api/atom_api_session.cc

@@ -277,14 +277,15 @@ void SetCertVerifyProcInIO(
 
 void ClearHostResolverCacheInIO(
     const scoped_refptr<net::URLRequestContextGetter>& context_getter,
-    const base::Closure& callback) {
+    util::Promise promise) {
   auto* request_context = context_getter->GetURLRequestContext();
   auto* cache = request_context->host_resolver()->GetHostCache();
   if (cache) {
     cache->clear();
     DCHECK_EQ(0u, cache->size());
-    if (!callback.is_null())
+    base::PostTaskWithTraits(
-      RunCallbackInUI(callback);
+        FROM_HERE, {BrowserThread::UI},
+        base::BindOnce(util::Promise::ResolveEmptyPromise, std::move(promise)));
   }
 }
 
@@ -564,15 +565,17 @@ void Session::SetPermissionCheckHandler(v8::Local<v8::Value> val,
   permission_manager->SetPermissionCheckHandler(handler);
 }
 
-void Session::ClearHostResolverCache(mate::Arguments* args) {
+v8::Local<v8::Promise> Session::ClearHostResolverCache(mate::Arguments* args) {
-  base::Closure callback;
+  v8::Isolate* isolate = args->isolate();
-  args->GetNext(&callback);
+  util::Promise promise(isolate);
+  v8::Local<v8::Promise> handle = promise.GetHandle();
 
   base::PostTaskWithTraits(
       FROM_HERE, {BrowserThread::IO},
       base::BindOnce(&ClearHostResolverCacheInIO,
                      WrapRefCounted(browser_context_->GetRequestContext()),
-                     callback));
+                     std::move(promise)));
+  return handle;
 }
 
 void Session::ClearAuthCache(mate::Arguments* args) {

atom/browser/api/atom_api_session.h

@@ -77,7 +77,7 @@ class Session : public mate::TrackableObject<Session>,
                                    mate::Arguments* args);
   void SetPermissionCheckHandler(v8::Local<v8::Value> val,
                                  mate::Arguments* args);
-  void ClearHostResolverCache(mate::Arguments* args);
+  v8::Local<v8::Promise> ClearHostResolverCache(mate::Arguments* args);
   void ClearAuthCache(mate::Arguments* args);
   void AllowNTLMCredentialsForDomains(const std::string& domains);
   void SetUserAgent(const std::string& user_agent, mate::Arguments* args);

docs/api/promisification.md

@@ -17,7 +17,6 @@ When a majority of affected functions are migrated, this flag will be enabled by
 - [ses.clearCache(callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#clearCache)
 - [ses.setProxy(config, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#setProxy)
 - [ses.resolveProxy(url, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#resolveProxy)
-- [ses.clearHostResolverCache([callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearHostResolverCache)
 - [ses.getBlobData(identifier, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#getBlobData)
 - [ses.clearAuthCache(options[, callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearAuthCache)
 - [contents.executeJavaScript(code[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#executeJavaScript)
@@ -46,6 +45,7 @@ When a majority of affected functions are migrated, this flag will be enabled by
 - [dialog.showSaveDialog([browserWindow, ]options[, callback])](https://github.com/electron/electron/blob/master/docs/api/dialog.md#showSaveDialog)
 - [netLog.stopLogging([callback])](https://github.com/electron/electron/blob/master/docs/api/net-log.md#stopLogging)
 - [protocol.isProtocolHandled(scheme, callback)](https://github.com/electron/electron/blob/master/docs/api/protocol.md#isProtocolHandled)
+- [ses.clearHostResolverCache([callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearHostResolverCache)
 - [ses.clearStorageData([options, callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearStorageData)
 - [shell.openExternal(url[, options, callback])](https://github.com/electron/electron/blob/master/docs/api/shell.md#openExternal)
 - [webviewTag.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/webview-tag.md#capturePage)

docs/api/session.md

@@ -354,12 +354,20 @@ session.fromPartition('some-partition').setPermissionCheckHandler((webContents,
 })
 ```
 
-#### `ses.clearHostResolverCache([callback])`
+#### `ses.clearHostResolverCache(callback)`
 
 * `callback` Function (optional) - Called when operation is done.
 
 Clears the host resolver cache.
 
+**[Deprecated Soon](promisification.md)**
+
+#### `ses.clearHostResolverCache()`
+
+Returns `Promise<void>` - Resolves when the operation is complete.
+
+Clears the host resolver cache.
+
 #### `ses.allowNTLMCredentialsForDomains(domains)`
 
 * `domains` String - A comma-separated list of servers for which

lib/browser/api/session.js

@@ -24,6 +24,7 @@ Session.prototype._init = function () {
 }
 
 Session.prototype.clearStorageData = deprecate.promisify(Session.prototype.clearStorageData)
+Session.prototype.clearHostResolverCache = deprecate.promisify(Session.prototype.clearHostResolverCache)
 
 Cookies.prototype.flushStore = deprecate.promisify(Cookies.prototype.flushStore)
 Cookies.prototype.get = deprecate.promisify(Cookies.prototype.get)

spec/api-session-spec.js

@@ -643,7 +643,7 @@ describe('session module', () => {
       // creation of request context which in turn initializes
       // the network context, can be removed with network
       // service enabled.
-      customSession.clearHostResolverCache(() => done())
+      customSession.clearHostResolverCache().then(() => done())
     })
 
     afterEach(() => {