C++ didFail函数代码示例

void Loader::cancelRequests(DocLoader* dl)
{
    DeprecatedPtrListIterator<Request> pIt(m_requestsPending);
    while (pIt.current()) {
        if (pIt.current()->docLoader() == dl) {
            cache()->remove(pIt.current()->cachedResource());
            m_requestsPending.remove(pIt);
            dl->decrementRequestCount();
        } else
            ++pIt;
    }

    Vector<SubresourceLoader*, 256> loadersToCancel;

    RequestMap::iterator end = m_requestsLoading.end();
    for (RequestMap::iterator i = m_requestsLoading.begin(); i != end; ++i) {
        Request* r = i->second;
        if (r->docLoader() == dl)
            loadersToCancel.append(i->first.get());
    }

    for (unsigned i = 0; i < loadersToCancel.size(); ++i) {
        SubresourceLoader* loader = loadersToCancel[i];
        didFail(loader, true);
    }
    
    if (dl->loadInProgress())
        ASSERT(dl->requestCount() == 1);
    else
        ASSERT(dl->requestCount() == 0);
}

void ResourceLoader::requestSynchronously()
{
    OwnPtr<WebKit::WebURLLoader> loader = adoptPtr(WebKit::Platform::current()->createURLLoader());
    ASSERT(loader);

    RELEASE_ASSERT(m_connectionState == ConnectionStateNew);
    m_connectionState = ConnectionStateStarted;

    WebKit::WrappedResourceRequest requestIn(m_request);
    requestIn.setAllowStoredCredentials(m_options.allowCredentials == AllowStoredCredentials);
    WebKit::WebURLResponse responseOut;
    responseOut.initialize();
    WebKit::WebURLError errorOut;
    WebKit::WebData dataOut;
    loader->loadSynchronously(requestIn, responseOut, errorOut, dataOut);
    if (errorOut.reason) {
        didFail(0, errorOut);
        return;
    }
    didReceiveResponse(0, responseOut);
    RefPtr<ResourceLoadInfo> resourceLoadInfo = responseOut.toResourceResponse().resourceLoadInfo();
    m_host->didReceiveData(m_resource, dataOut.data(), dataOut.size(), resourceLoadInfo ? resourceLoadInfo->encodedDataLength : -1, m_options);
    m_resource->setResourceBuffer(dataOut);
    didFinishLoading(0, responseOut.responseTime());
}

void ResourceLoader::requestSynchronously()
{
    OwnPtr<blink::WebURLLoader> loader = adoptPtr(blink::Platform::current()->createURLLoader());
    ASSERT(loader);

    RefPtr<ResourceLoader> protect(this);
    RefPtr<ResourceLoaderHost> protectHost(m_host);
    ResourcePtr<Resource> protectResource(m_resource);

    RELEASE_ASSERT(m_connectionState == ConnectionStateNew);
    m_connectionState = ConnectionStateStarted;

    blink::WrappedResourceRequest requestIn(m_request);
    requestIn.setAllowStoredCredentials(m_options.allowCredentials == AllowStoredCredentials);
    blink::WebURLResponse responseOut;
    responseOut.initialize();
    blink::WebURLError errorOut;
    blink::WebData dataOut;
    loader->loadSynchronously(requestIn, responseOut, errorOut, dataOut);
    if (errorOut.reason) {
        didFail(0, errorOut);
        return;
    }
    didReceiveResponse(0, responseOut);
    if (m_state == Terminated)
        return;
    RefPtr<ResourceLoadInfo> resourceLoadInfo = responseOut.toResourceResponse().resourceLoadInfo();
    int64 encodedDataLength = resourceLoadInfo ? resourceLoadInfo->encodedDataLength : blink::WebURLLoaderClient::kUnknownEncodedDataLength;
    m_host->didReceiveData(m_resource, dataOut.data(), dataOut.size(), encodedDataLength);
    m_resource->setResourceBuffer(dataOut);
    didFinishLoading(0, monotonicallyIncreasingTime(), encodedDataLength);
}

void NetworkResourceLoader::continueWillSendRequest(const ResourceRequest& newRequest)
{
#if PLATFORM(COCOA)
    m_currentRequest.updateFromDelegatePreservingOldProperties(newRequest.nsURLRequest(DoNotUpdateHTTPBody));
#elif USE(SOUP)
    // FIXME: Implement ResourceRequest::updateFromDelegatePreservingOldProperties. See https://bugs.webkit.org/show_bug.cgi?id=126127.
    m_currentRequest.updateFromDelegatePreservingOldProperties(newRequest);
#endif

    if (m_currentRequest.isNull()) {
#if USE(NETWORK_SESSION)
        // FIXME: Do something here.
        notImplemented();
#else
        m_handle->cancel();
        didFail(m_handle.get(), cancelledError(m_currentRequest));
#endif
        return;
    }

#if USE(NETWORK_SESSION)
    // FIXME: Do something here.
    notImplemented();
#else
    m_handle->continueWillSendRequest(m_currentRequest);
#endif
}

bool ResourceLoader::load(const ResourceRequest& r)
{
    ASSERT(!m_handle);
    ASSERT(m_deferredRequest.isNull());
    ASSERT(!m_documentLoader->isSubstituteLoadPending(this));
    
    ResourceRequest clientRequest(r);
    willSendRequest(clientRequest, ResourceResponse());
    if (clientRequest.isNull()) {
        didFail(frameLoader()->cancelledError(r));
        return false;
    }
    
    if (m_documentLoader->scheduleArchiveLoad(this, clientRequest, r.url()))
        return true;
    
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    if (m_documentLoader->applicationCacheHost()->maybeLoadResource(this, clientRequest, r.url()))
        return true;
#endif

    if (m_defersLoading) {
        m_deferredRequest = clientRequest;
        return true;
    }
    
    m_handle = ResourceHandle::create(clientRequest, this, m_frame.get(), m_defersLoading, m_shouldContentSniff, true);

    return true;
}

bool ResourceLoader::load(const ResourceRequest& r)
{
    ASSERT(!m_handle);
    ASSERT(m_deferredRequest.isNull());
    ASSERT(!frameLoader()->isArchiveLoadPending(this));
    
    m_originalURL = r.url();
    
    ResourceRequest clientRequest(r);
    willSendRequest(clientRequest, ResourceResponse());
    if (clientRequest.isNull()) {
        didFail(frameLoader()->cancelledError(r));
        return false;
    }
    
    if (frameLoader()->willUseArchive(this, clientRequest, m_originalURL))
        return true;
    
    if (m_defersLoading) {
        m_deferredRequest = clientRequest;
        return true;
    }
    
    m_handle = ResourceHandle::create(clientRequest, this, m_frame.get(), m_defersLoading, m_shouldContentSniff, true);

    return true;
}

bool ResourceLoader::init(const ResourceRequest& r)
{
    ASSERT(!m_handle);
    ASSERT(m_request.isNull());
    ASSERT(m_deferredRequest.isNull());
    ASSERT(!m_documentLoader->isSubstituteLoadPending(this));
    
    ResourceRequest clientRequest(r);
    
    if (m_options.securityCheck == DoSecurityCheck && !m_frame->document()->securityOrigin()->canDisplay(clientRequest.url())) {
        FrameLoader::reportLocalLoadFailed(m_frame.get(), clientRequest.url().string());
        releaseResources();
        return false;
    }
    
    // https://bugs.webkit.org/show_bug.cgi?id=26391
    // The various plug-in implementations call directly to ResourceLoader::load() instead of piping requests
    // through FrameLoader. As a result, they miss the FrameLoader::addExtraFieldsToRequest() step which sets
    // up the 1st party for cookies URL. Until plug-in implementations can be reigned in to pipe through that
    // method, we need to make sure there is always a 1st party for cookies set.
    if (clientRequest.firstPartyForCookies().isNull()) {
        if (Document* document = m_frame->document())
            clientRequest.setFirstPartyForCookies(document->firstPartyForCookies());
    }

    willSendRequest(clientRequest, ResourceResponse());
    if (clientRequest.isNull()) {
        didFail(cancelledError());
        return false;
    }

    m_originalRequest = m_request = clientRequest;
    return true;
}

void ResourceLoader::didReceiveAuthenticationChallenge(const AuthenticationChallenge& challenge)
{
    ASSERT(handle()->hasAuthenticationChallenge());
    // Protect this in this delegate method since the additional processing can do
    // anything including possibly derefing this; one example of this is Radar 3266216.
    RefPtr<ResourceLoader> protector(this);

    if (m_options.allowCredentials == AllowStoredCredentials) {
        if (m_options.crossOriginCredentialPolicy == AskClientForCrossOriginCredentials || m_frame->document()->securityOrigin()->canRequest(originalRequest().url())) {
        	// SRL: Event action for https request.
        	ActionLogFormat(ActionLog::ENTER_SCOPE,
            		"auth_recv:%s",
            		m_request.url().lastPathComponent().ascii().data());
            frameLoader()->notifier()->didReceiveAuthenticationChallenge(this, challenge);
            ActionLogScopeEnd();
            return;
        }
    }
    // Only these platforms provide a way to continue without credentials.
    // If we can't continue with credentials, we need to cancel the load altogether.
#if PLATFORM(MAC) || USE(CFNETWORK) || USE(CURL)
    handle()->receivedRequestToContinueWithoutCredential(challenge);
    ASSERT(!handle()->hasAuthenticationChallenge());
#else
    didFail(blockedError());
#endif
}

void ResourceLoader::didFail(ResourceHandle*, const ResourceError& error)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForError(this, error))
        return;
#endif
    didFail(error);
}

void ResourceLoader::willSendRequestInternal(ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    // Protect this in this delegate method since the additional processing can do
    // anything including possibly derefing this; one example of this is Radar 3266216.
    Ref<ResourceLoader> protect(*this);

    ASSERT(!m_reachedTerminalState);
#if ENABLE(CONTENT_EXTENSIONS)
    ASSERT(m_resourceType != ResourceType::Invalid);
#endif

    // We need a resource identifier for all requests, even if FrameLoader is never going to see it (such as with CORS preflight requests).
    bool createdResourceIdentifier = false;
    if (!m_identifier) {
        m_identifier = m_frame->page()->progress().createUniqueIdentifier();
        createdResourceIdentifier = true;
    }

#if ENABLE(CONTENT_EXTENSIONS)
    if (frameLoader()) {
        Page* page = frameLoader()->frame().page();
        if (page && m_documentLoader) {
            auto* userContentController = page->userContentController();
            if (userContentController)
                userContentController->processContentExtensionRulesForLoad(*page, request, m_resourceType, *m_documentLoader);
        }
    }
#endif

    if (request.isNull()) {
        didFail(cannotShowURLError());
        return;
    }

    if (m_options.sendLoadCallbacks() == SendCallbacks) {
        if (createdResourceIdentifier)
            frameLoader()->notifier().assignIdentifierToInitialRequest(m_identifier, documentLoader(), request);

#if PLATFORM(IOS)
        // If this ResourceLoader was stopped as a result of assignIdentifierToInitialRequest, bail out
        if (m_reachedTerminalState)
            return;
#endif

        frameLoader()->notifier().willSendRequest(this, request, redirectResponse);
    }
    else
        InspectorInstrumentation::willSendRequest(m_frame.get(), m_identifier, m_frame->loader().documentLoader(), request, redirectResponse);

    if (!redirectResponse.isNull())
        platformStrategies()->loaderStrategy()->resourceLoadScheduler()->crossOriginRedirectReceived(this, request.url());

    m_request = request;

    if (!redirectResponse.isNull() && !m_documentLoader->isCommitted())
        frameLoader()->client().dispatchDidReceiveServerRedirectForProvisionalLoad();
}

void ResourceLoader::didFail(ResourceHandle*, const ResourceError& error)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    if (!error.isCancellation()) {
        if (documentLoader()->scheduleLoadFallbackResourceFromApplicationCache(this, m_request))
            return;
    }
#endif
    didFail(error);
}

void DocumentThreadableLoader::cancel()
{
    if (m_client) {
        ResourceError error(errorDomainWebKitInternal, 0, m_resource->url(), "Load cancelled");
        error.setIsCancellation(true);
        didFail(error);
    }
    clearResource();
    m_client = 0;
}

void DocumentThreadableLoader::notifyFinished(Resource* resource)
{
    ASSERT(m_client);
    ASSERT(resource == this->resource());

    m_timeoutTimer.stop();

    if (resource->errorOccurred())
        didFail(resource->identifier(), resource->resourceError());
    else
        didFinishLoading(resource->identifier(), resource->loadFinishTime());
}

void DocumentThreadableLoader::cancel()
{
    RefPtr<DocumentThreadableLoader> protect(this);

    // Cancel can re-enter and m_resource might be null here as a result.
    if (m_client && m_resource) {
        ResourceError error(errorDomainWebKitInternal, 0, m_resource->url(), "Load cancelled");
        error.setIsCancellation(true);
        didFail(error);
    }
    clearResource();
    m_client = 0;
}

void DocumentThreadableLoader::notifyFinished(CachedResource* resource)
{
    ASSERT(m_client);
    ASSERT_UNUSED(resource, resource == m_resource);
        
    if (m_resource && (m_resource->errorOccurred() || m_resource->wasCanceled())) {
        ResourceError error("Network Request Failed", 0, m_resource->url(), "Resource failed to load");
        if (m_resource->wasCanceled())
            error.setIsCancellation(true);
        didFail(error);
    } else
        didFinishLoading(m_resource->identifier(), m_resource->loadFinishTime());
}