Split ServiceWorkerURLLoaderJob from URLJobWrapper

content/browser/service_worker/service_worker_url_loader_job.cc

+// Copyright 2017 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 "content/browser/service_worker/service_worker_url_loader_job.h"
+
+#include "base/command_line.h"
+#include "content/browser/service_worker/service_worker_fetch_dispatcher.h"
+#include "content/browser/service_worker/service_worker_version.h"
+#include "content/common/service_worker/service_worker_utils.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/common/browser_side_navigation_policy.h"
+#include "content/public/common/content_switches.h"
+#include "net/base/io_buffer.h"
+#include "storage/browser/blob/blob_reader.h"
+#include "storage/browser/blob/blob_storage_context.h"
+
+namespace content {
+
+ServiceWorkerURLLoaderJob::ServiceWorkerURLLoaderJob(
+    LoaderCallback callback,
+    Delegate* delegate,
+    const ResourceRequest& resource_request,
+    base::WeakPtr<storage::BlobStorageContext> blob_storage_context)
+    : loader_callback_(std::move(callback)),
+      delegate_(delegate),
+      resource_request_(resource_request),
+      blob_storage_context_(blob_storage_context),
+      binding_(this),
+      weak_factory_(this) {
+  DCHECK(IsBrowserSideNavigationEnabled() &&
+         base::CommandLine::ForCurrentProcess()->HasSwitch(
+             switches::kEnableNetworkService));
+}
+
+ServiceWorkerURLLoaderJob::~ServiceWorkerURLLoaderJob() {}
+
+void ServiceWorkerURLLoaderJob::FallbackToNetwork() {
+  response_type_ = FALLBACK_TO_NETWORK;
+  // This could be called multiple times in some cases because we simply
+  // call this synchronously here and don't wait for a separate async
+  // StartRequest cue like what URLRequestJob case does.
+  // TODO(kinuko): Make sure this is ok or we need to make this async.
+  if (!loader_callback_.is_null())
+    std::move(loader_callback_).Run(StartLoaderCallback());
+}
+
+void ServiceWorkerURLLoaderJob::FallbackToNetworkOrRenderer() {
+  // TODO(kinuko): Implement this. Now we always fallback to network.
+  FallbackToNetwork();
+}
+
+void ServiceWorkerURLLoaderJob::ForwardToServiceWorker() {
+  response_type_ = FORWARD_TO_SERVICE_WORKER;
+  StartRequest();
+}
+
+bool ServiceWorkerURLLoaderJob::ShouldFallbackToNetwork() {
+  return response_type_ == FALLBACK_TO_NETWORK;
+}
+
+ui::PageTransition ServiceWorkerURLLoaderJob::GetPageTransition() {
+  NOTIMPLEMENTED();
+  return ui::PAGE_TRANSITION_LINK;
+}
+
+size_t ServiceWorkerURLLoaderJob::GetURLChainSize() const {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
+void ServiceWorkerURLLoaderJob::FailDueToLostController() {
+  NOTIMPLEMENTED();
+}
+
+void ServiceWorkerURLLoaderJob::Cancel() {
+  canceled_ = true;
+}
+
+bool ServiceWorkerURLLoaderJob::WasCanceled() const {
+  return canceled_;
+}
+
+void ServiceWorkerURLLoaderJob::StartRequest() {
+  DCHECK_EQ(FORWARD_TO_SERVICE_WORKER, response_type_);
+
+  ServiceWorkerMetrics::URLRequestJobResult result =
+      ServiceWorkerMetrics::REQUEST_JOB_ERROR_BAD_DELEGATE;
+  ServiceWorkerVersion* active_worker =
+      delegate_->GetServiceWorkerVersion(&result);
+
+  fetch_dispatcher_.reset(new ServiceWorkerFetchDispatcher(
+      CreateFetchRequest(resource_request_), active_worker,
+      resource_request_.resource_type, base::nullopt,
+      net::NetLogWithSource() /* TODO(scottmg): net log? */,
+      base::Bind(&ServiceWorkerURLLoaderJob::DidPrepareFetchEvent,
+                 weak_factory_.GetWeakPtr(), active_worker),
+      base::Bind(&ServiceWorkerURLLoaderJob::DidDispatchFetchEvent,
+                 weak_factory_.GetWeakPtr())));
+  fetch_dispatcher_->Run();
+}
+
+std::unique_ptr<ServiceWorkerFetchRequest>
+ServiceWorkerURLLoaderJob::CreateFetchRequest(const ResourceRequest& request) {
+  std::string blob_uuid;
+  uint64_t blob_size = 0;
+  // TODO(scottmg): Implement passing body as blob to handler.
+  DCHECK(!request.request_body);
+  auto new_request = base::MakeUnique<ServiceWorkerFetchRequest>();
+  new_request->mode = request.fetch_request_mode;
+  new_request->is_main_resource_load =
+      ServiceWorkerUtils::IsMainResourceType(request.resource_type);
+  new_request->request_context_type = request.fetch_request_context_type;
+  new_request->frame_type = request.fetch_frame_type;
+  new_request->url = request.url;
+  new_request->method = request.method;
+  new_request->blob_uuid = blob_uuid;
+  new_request->blob_size = blob_size;
+  new_request->credentials_mode = request.fetch_credentials_mode;
+  new_request->redirect_mode = request.fetch_redirect_mode;
+  new_request->is_reload = ui::PageTransitionCoreTypeIs(
+      request.transition_type, ui::PAGE_TRANSITION_RELOAD);
+  new_request->referrer =
+      Referrer(GURL(request.referrer), request.referrer_policy);
+  new_request->fetch_type = ServiceWorkerFetchType::FETCH;
+  return new_request;
+}
+
+void ServiceWorkerURLLoaderJob::DidPrepareFetchEvent(
+    scoped_refptr<ServiceWorkerVersion> version) {}
+
+void ServiceWorkerURLLoaderJob::DidDispatchFetchEvent(
+    ServiceWorkerStatusCode status,
+    ServiceWorkerFetchEventResult fetch_result,
+    const ServiceWorkerResponse& response,
+    blink::mojom::ServiceWorkerStreamHandlePtr body_as_stream,
+    const scoped_refptr<ServiceWorkerVersion>& version) {
+  if (fetch_result == SERVICE_WORKER_FETCH_EVENT_RESULT_FALLBACK) {
+    std::move(loader_callback_).Run(StartLoaderCallback());
+    return;
+  }
+  DCHECK_EQ(fetch_result, SERVICE_WORKER_FETCH_EVENT_RESULT_RESPONSE);
+  std::move(loader_callback_)
+      .Run(base::Bind(&ServiceWorkerURLLoaderJob::StartResponse,
+                      weak_factory_.GetWeakPtr(), response,
+                      base::Passed(std::move(body_as_stream))));
+}
+
+void ServiceWorkerURLLoaderJob::StartResponse(
+    const ServiceWorkerResponse& response,
+    blink::mojom::ServiceWorkerStreamHandlePtr body_as_stream,
+    mojom::URLLoaderRequest request,
+    mojom::URLLoaderClientPtr client) {
+  DCHECK(!binding_.is_bound());
+  binding_.Bind(std::move(request));
+  binding_.set_connection_error_handler(
+      base::Bind(&ServiceWorkerURLLoaderJob::Cancel, base::Unretained(this)));
+  url_loader_client_ = std::move(client);
+
+  ResourceResponseHead head;
+  // TODO(scottmg): More fields in |head| required?
+  head.headers = new net::HttpResponseHeaders("");
+  for (const auto& kv : response.headers)
+    head.headers->AddHeader(kv.first + ": " + kv.second);
+  head.url_list_via_service_worker = response.url_list;
+  head.mime_type = "text/html";  // TODO(scottmg): No idea where to get this.
+  head.was_fetched_via_service_worker = true;
+  head.cors_exposed_header_names = response.cors_exposed_header_names;
+  url_loader_client_->OnReceiveResponse(
+      head, base::nullopt /* TODO(scottmg): ssl info */,
+      mojom::DownloadedTempFilePtr());
+
+  // Ideally, we would always get a data pipe fom SWFetchDispatcher and use
+  // this case. See:
+  // https://docs.google.com/a/google.com/document/d/1_ROmusFvd8ATwIZa29-P6Ls5yyLjfld0KvKchVfA84Y/edit?usp=drive_web
+  if (!body_as_stream.is_null() && body_as_stream->stream.is_valid()) {
+    url_loader_client_->OnStartLoadingResponseBody(
+        std::move(body_as_stream->stream));
+  } else {
+    // TODO(scottmg): This is temporary way to load the blob right here and
+    // turn it into a data pipe to respond with, until we are always able to
+    // take the above path.
+    if (!response.blob_uuid.empty() && blob_storage_context_) {
+      std::unique_ptr<storage::BlobDataHandle> blob_data_handle =
+          blob_storage_context_->GetBlobDataFromUUID(response.blob_uuid);
+      blob_reader_ = blob_data_handle->CreateReader(
+          nullptr /* file system context */,
+          BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get());
+      CHECK(storage::BlobReader::Status::DONE ==
+            blob_reader_->CalculateSize(net::CompletionCallback()));
+      blob_reader_->SetReadRange(0, blob_reader_->total_size());
+      scoped_refptr<net::IOBuffer> buffer(
+          new net::IOBuffer(static_cast<size_t>(blob_reader_->total_size())));
+
+      int bytes_read;
+      blob_reader_->Read(buffer.get(), blob_reader_->total_size(), &bytes_read,
+                         base::Bind(&ServiceWorkerURLLoaderJob::AfterRead,
+                                    weak_factory_.GetWeakPtr(), buffer));
+    }
+  }
+}
+
+void ServiceWorkerURLLoaderJob::AfterRead(scoped_refptr<net::IOBuffer> buffer,
+                                          int bytes) {
+  uint32_t bytes_written = static_cast<uint32_t>(bytes);
+  mojo::WriteDataRaw(data_pipe_.producer_handle.get(), buffer->data(),
+                     &bytes_written, MOJO_WRITE_DATA_FLAG_NONE);
+  url_loader_client_->OnStartLoadingResponseBody(
+      std::move(data_pipe_.consumer_handle));
+}
+
+void ServiceWorkerURLLoaderJob::FollowRedirect() {
+  NOTIMPLEMENTED();
+}
+
+void ServiceWorkerURLLoaderJob::SetPriority(net::RequestPriority priority,
+                                            int32_t intra_priority_value) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace content