network service: Add job wrapper to SWControlleeRequestHandler

content/browser/service_worker/service_worker_job_wrapper.h

+// 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.
+
+#ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_JOB_WRAPPER_H_
+#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_JOB_WRAPPER_H_
+
+#include "base/macros.h"
+#include "content/browser/service_worker/service_worker_url_request_job.h"
+
+namespace content {
+
+// TODO(scottmg): Not yet implemented. See https://crbug.com/715640.
+class ServiceWorkerControlleeURLLoaderFactory;
+
+// This class is a helper to support having
+// ServiceWorkerControlleeRequestHandler work with both URLRequestJobs and
+// mojom::URLLoaderFactorys (that is, both with and without
+// --enable-network-service). It wraps either a ServiceWorkerURLRequestJob or a
+// ServiceWorkerControlleeRequestHandler and forwards to the underlying
+// implementation.
+class ServiceWorkerJobWrapper {
+ public:
+  // Non-network service case.
+  explicit ServiceWorkerJobWrapper(
+      base::WeakPtr<ServiceWorkerURLRequestJob> url_request_job);
+
+  // With --enable-network-service.
+  explicit ServiceWorkerJobWrapper(
+      ServiceWorkerControlleeURLLoaderFactory* factory);

[kinuko, 2017/05/11 12:48:53]

I wonder if this should rather wrap urlloader?

[scottmg, 2017/05/16 18:28:51]

I'm not 100% sure if that will work yet, but that does seem closer to wrapping
ServiceWorkerURLRequestJob, so seems like a good idea for now. Done.

+
+  ~ServiceWorkerJobWrapper();
+
+  // Sets the response type.
+  void FallbackToNetwork();
+  void FallbackToNetworkOrRenderer();
+  void ForwardToServiceWorker();
+
+  // Returns true if this job should not be handled by a service worker, but
+  // instead should fallback to the network.
+  bool ShouldFallbackToNetwork();
+
+  // Tells the job to abort with a start error. Currently this is only called
+  // because the controller was lost. This function could be made more generic
+  // if needed later.
+  void FailDueToLostController();
+
+  // Determines from the ResourceRequestInfo (or similar) the type of page
+  // transition used (for metrics purposes).
+  ui::PageTransition GetPageTransition();
+
+  // Determines the number of redirects used to handle the job (for metrics
+  // purposes).
+  size_t GetURLChainSize() const;

[kinuko, 2017/05/11 12:48:53]

I feel in the new code the job wouldn't know these... but we can look into these
later.

[scottmg, 2017/05/16 18:28:51]

Yeah, probably right. Since they're "only" for metrics maybe we can report them
elsewhere later.

+
+  // Returns true if the underlying job has been canceled or destroyed.
+  bool WasCanceled() const;
+
+ private:
+  base::WeakPtr<ServiceWorkerURLRequestJob> url_request_job_;
+  ServiceWorkerControlleeURLLoaderFactory* factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerJobWrapper);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_JOB_WRAPPER_H_