Expose the ServiceWorker's v8 context to embedders.

Source/web/tests/ServiceWorkerGlobalScopeProxyTest.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "Source/web/ServiceWorkerGlobalScopeProxy.h"
+
+#include "Source/bindings/core/v8/ScriptSourceCode.h"
+#include "Source/core/dom/CrossThreadTask.h"
+#include "platform/weborigin/KURL.cpp"
+#include "public/platform/Platform.h"
+#include "public/platform/WebThread.h"
+#include "public/platform/WebUnitTestSupport.h"
+#include "public/web/WebEmbeddedWorker.h"
+#include "public/web/WebEmbeddedWorkerStartData.h"
+#include "public/web/WebServiceWorkerContextClient.h"
+#include "web/WebEmbeddedWorkerImpl.h"
+#include "web/tests/URLTestHelpers.h"
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <v8.h>
+
+using namespace blink;
+using namespace WebCore;
+
+namespace {
+
+class ServiceWorkerGlobalScopeProxyTest : public testing::Test {
+protected:
+    ServiceWorkerGlobalScopeProxyTest()
+        : m_baseUrl("http://www.test.com/")
+    {
+    }
+
+    virtual ~ServiceWorkerGlobalScopeProxyTest()
+    {
+        Platform::current()->unitTestSupport()->unregisterAllMockedURLs();
+    }
+
+    // Remember to call serveAsynchronousMockedRequests() in order to handle these mocked URLs.
+    void registerMockedHttpURLLoad(const std::string& fileName, const std::string& mimeType = "text/html")
+    {
+        URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(m_baseUrl), WebString::fromUTF8(fileName), WebString::fromUTF8(mimeType));
+    }
+
+    const std::string m_baseUrl;
+};
+
+// Can repeatedly run the current thread's loop, but unlike Chrome's RunLoop, cannot be recursively reentered.
+// QuitWhenIdle() must be called exactly once per Run() call.
+class RunLoop {

[Jeffrey Yasskin, 2014/07/16 23:14:58]

I was kind of shocked not to find anything like this in the existing test
helpers. Does it really not exist in Blink, or did I miss it? Should I put it
somewhere reusable?

+public:
+    RunLoop()
+        : m_thread(blink::Platform::current()->currentThread())
+        , m_isRunning(false)
+        , m_isQuitting(false)
+    {
+    }
+
+    // Starts the thread's run loop, and returns when QuitWhenIdle() is called.
+    void Run()
+    {
+        EXPECT_FALSE(m_isRunning);
+        m_isRunning = true;
+        m_thread->enterRunLoop();
+        EXPECT_TRUE(m_isQuitting);
+        m_isRunning = m_isQuitting = false;
+    }
+
+    // This can be called before Run() or concurrently with it from another thread.
+    // The loop will terminate when it's idle.
+    void QuitWhenIdle()
+    {
+        EXPECT_FALSE(m_isQuitting);
+        m_isQuitting = true;
+        m_thread->postTask(new QuitTask(this));
+    }
+
+    bool isQuitting()
+    {
+        return m_isQuitting;
+    }
+
+private:
+    class QuitTask : public WebThread::Task {
+    public:
+        QuitTask(RunLoop* runLoop)
+            : m_runLoop(runLoop)
+        {
+        }
+        virtual void run()
+        {
+            EXPECT_TRUE(m_runLoop->m_isRunning);
+            EXPECT_TRUE(m_runLoop->m_isQuitting);
+            m_runLoop->m_thread->exitRunLoop();
+        }
+        RunLoop* m_runLoop;
+    };
+
+    WebThread* m_thread;
+    bool m_isRunning;
+    bool m_isQuitting;
+};
+
+// Continuously pumps the mocked-requests queue during the current execution of runLoop->Run(), or next if Run() isn't currently running.
+class ServeAsyncRequestsTask : public WebThread::Task {
+public:
+    ServeAsyncRequestsTask(RunLoop* runLoop)
+        : m_runLoop(runLoop)
+    {
+    }
+
+    virtual void run() OVERRIDE
+    {
+        Platform::current()->unitTestSupport()->serveAsynchronousMockedRequests();

[Jeffrey Yasskin, 2014/07/16 23:14:58]

This gets flagged by
https://code.google.com/p/chromium/codesearch/#chromium/src/third_party/WebKi....
I can't use pumpPendingRequests(WebFrame*) directly because WebEmbeddedWorker
doesn't expose the WebFrame it uses for loading. I could, of course, expose
that, but it seems less relevant to the overall abstraction than the other
things I'm exposing.

Should I pull this use out into a WorkerTestHelpers file, along with the
RunLoop? Something else?

+        // The RunLoop only finishes quitting when it has no tasks left, so this task has to end its chain explicitly.
+        if (!m_runLoop->isQuitting()) {
+            Platform::current()->currentThread()->postTask(new ServeAsyncRequestsTask(m_runLoop));
+        }
+    }
+
+private:
+    RunLoop* m_runLoop;
+};
+
+class V8ContextTestSWContextClient : public WebServiceWorkerContextClient {
+public:
+    virtual void workerContextFailedToStart()
+    {
+        ADD_FAILURE() << "workerContextFailedToStart";
+        m_runLoop->QuitWhenIdle();
+    }
+
+    virtual void reportException(const WebString& errorMessage, int lineNumber, int columnNumber, const WebString& sourceURL)
+    {
+        ADD_FAILURE() << sourceURL.utf8() << "(" << lineNumber << ":" << columnNumber << ") error: " << errorMessage.utf8();
+        m_runLoop->QuitWhenIdle();
+    }
+
+    virtual void workerContextStarted(WebServiceWorkerContextProxy* proxy)
+    {
+        m_proxy = proxy;
+        v8::HandleScope scope(v8::Isolate::GetCurrent());
+        EXPECT_TRUE(*m_proxy->v8Context()) << "The v8 context should be valid as soon as the worker is started.";
+        m_runLoop->QuitWhenIdle();
+    }
+
+    void checkContextAccessibleAfterClose()
+    {
+        v8::HandleScope scope(v8::Isolate::GetCurrent());
+        EXPECT_TRUE(*m_proxy->v8Context()) << "The v8 context should still be valid.";
+        static_cast<ServiceWorkerGlobalScopeProxy*>(m_proxy)->evaluate(String::fromUTF8("self.close();"));
+        // The context continues to exist until non-cleanup tasks stop running.
+        checkContextStillExists();
+        // close() will eventually terminate the worker, which will quit the
+        // RunLoop through workerContextDestroyed.
+    }
+
+    void checkContextStillExists()
+    {
+        // The context isn't valid after willDestroyWorkerContext().
+        if (!m_proxy)
+            return;
+        v8::HandleScope scope(v8::Isolate::GetCurrent());
+        EXPECT_TRUE(*m_proxy->v8Context());
+        static_cast<WebEmbeddedWorkerImpl*>(m_worker)->postTask(createCrossThreadTask(&V8ContextTestSWContextClient::checkContextStillExists, this));
+    }
+
+    virtual void willDestroyWorkerContext() OVERRIDE
+    {
+        m_proxy = 0;
+    }
+
+    virtual void workerContextDestroyed() OVERRIDE
+    {
+        // Now it's safe to finish the main test, which will destroy the WorkerThread.
+        m_runLoop->QuitWhenIdle();
+    }
+
+    RunLoop* m_runLoop;
+    WebEmbeddedWorker* m_worker;
+    WebServiceWorkerContextProxy* m_proxy;
+};
+
+TEST_F(ServiceWorkerGlobalScopeProxyTest, V8ContextText)
+{
+    V8ContextTestSWContextClient* contextClient = new V8ContextTestSWContextClient;
+
+    RunLoop runLoop;
+    contextClient->m_runLoop = &runLoop;
+
+    OwnPtr<WebEmbeddedWorker> worker = adoptPtr(WebEmbeddedWorker::create(contextClient, 0));
+    contextClient->m_worker = worker.get();
+
+    WebEmbeddedWorkerStartData startData;
+    registerMockedHttpURLLoad("blank.js", "text/javascript");
+    startData.scriptURL = URLTestHelpers::toKURL(m_baseUrl + "blank.js");
+    worker->startWorkerContext(startData);
+    // Serve requests until the message loop quits.
+    Platform::current()->currentThread()->postTask(new ServeAsyncRequestsTask(&runLoop));
+    runLoop.Run(); // Wait for workerContextStarted().
+
+    static_cast<WebEmbeddedWorkerImpl&>(*worker).postTask(
+        createCrossThreadTask(&V8ContextTestSWContextClient::checkContextAccessibleAfterClose, contextClient));
+    runLoop.Run(); // Wait for workerContextDestroyed().
+}
+
+} // namespace