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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_ |
| 6 #define HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_ |
| 7 |
| 8 #include <memory> |
| 9 |
| 10 #include "base/single_thread_task_runner.h" |
| 11 #include "net/url_request/url_request_job_factory.h" |
| 12 |
| 13 namespace net { |
| 14 class URLRequestContext; |
| 15 class URLRequestJobFactory; |
| 16 } // namespace |
| 17 |
| 18 namespace headless { |
| 19 class DeterministicDispatcher; |
| 20 class HeadlessBrowserContext; |
| 21 |
| 22 // A deterministic protocol handler. Requests made to this protocol handler |
| 23 // will return in order of creation, regardless of what order the network |
| 24 // returns them in. This helps remove one large source of network related |
| 25 // non determinism at the cost of slower page loads. |
| 26 class DeterministicHttpProtocolHandler |
| 27 : public net::URLRequestJobFactory::ProtocolHandler { |
| 28 public: |
| 29 // Note |deterministic_dispatcher| is expected to be shared across a number of |
| 30 // protocol handlers, e.g. for http & https protocols. |
| 31 DeterministicHttpProtocolHandler( |
| 32 DeterministicDispatcher* deterministic_dispatcher, |
| 33 scoped_refptr<base::SingleThreadTaskRunner> io_task_runner); |
| 34 ~DeterministicHttpProtocolHandler() override; |
| 35 |
| 36 net::URLRequestJob* MaybeCreateJob( |
| 37 net::URLRequest* request, |
| 38 net::NetworkDelegate* network_delegate) const override; |
| 39 |
| 40 private: |
| 41 class NopGenericURLRequestJobDelegate; |
| 42 |
| 43 DeterministicDispatcher* deterministic_dispatcher_; // NOT OWNED. |
| 44 scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_; |
| 45 std::unique_ptr<NopGenericURLRequestJobDelegate> nop_delegate_; |
| 46 |
| 47 // |url_request_context_| and |url_request_job_factory_| are lazily created on |
| 48 // the IO thread. The URLRequestContext is setup to bypass any user-specified |
| 49 // protocol handlers including this one. This is necessary to actually fetch |
| 50 // http resources. |
| 51 mutable std::unique_ptr<net::URLRequestContext> url_request_context_; |
| 52 mutable std::unique_ptr<net::URLRequestJobFactory> url_request_job_factory_; |
| 53 |
| 54 DISALLOW_COPY_AND_ASSIGN(DeterministicHttpProtocolHandler); |
| 55 }; |
| 56 |
| 57 } // namespace headless |
| 58 |
| 59 #endif // HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_ |
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