QUICHE team | 65f778f | 2019-04-17 14:28:20 -0700 | [diff] [blame] | 1 | // Copyright (c) 2019 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 QUICHE_QUIC_QUARTC_TEST_RANDOM_DELAY_LINK_H_ |
| 6 | #define QUICHE_QUIC_QUARTC_TEST_RANDOM_DELAY_LINK_H_ |
| 7 | |
| 8 | #include "net/third_party/quiche/src/quic/core/crypto/quic_random.h" |
| 9 | #include "net/third_party/quiche/src/quic/core/quic_bandwidth.h" |
| 10 | #include "net/third_party/quiche/src/quic/core/quic_time.h" |
| 11 | #include "net/third_party/quiche/src/quic/test_tools/simulator/link.h" |
| 12 | #include "net/third_party/quiche/src/quic/test_tools/simulator/port.h" |
| 13 | #include "net/third_party/quiche/src/quic/test_tools/simulator/simulator.h" |
| 14 | |
| 15 | namespace quic { |
| 16 | namespace simulator { |
| 17 | |
| 18 | // A reliable simplex link between two endpoints with constrained bandwidth. A |
| 19 | // random delay is added to each packet. The random values are chosen |
| 20 | // separately for each packet, following an exponential distribution. |
| 21 | class RandomDelayLink : public OneWayLink { |
| 22 | public: |
| 23 | RandomDelayLink(Simulator* simulator, |
| 24 | std::string name, |
| 25 | UnconstrainedPortInterface* sink, |
| 26 | QuicBandwidth bandwidth, |
| 27 | QuicTime::Delta propagation_delay); |
| 28 | RandomDelayLink(const RandomDelayLink&) = delete; |
| 29 | RandomDelayLink& operator=(const RandomDelayLink&) = delete; |
| 30 | ~RandomDelayLink() override; |
| 31 | |
| 32 | // Sets the median value of the random delay introduced by this link. Random |
| 33 | // delays are chosen according to an exponential distribution, clipped and |
| 34 | // scaled to reach this as a median value. |
| 35 | inline void set_median_random_delay(QuicTime::Delta delta) { |
| 36 | median_random_delay_ = delta; |
| 37 | } |
| 38 | |
| 39 | protected: |
| 40 | QuicTime::Delta GetRandomDelay(QuicTime::Delta transfer_time) override; |
| 41 | |
| 42 | private: |
| 43 | QuicTime::Delta median_random_delay_; |
| 44 | }; |
| 45 | |
| 46 | // A full-duplex link between two endpoints, functionally equivalent to two |
| 47 | // RandomDelayLink objects tied together. |
| 48 | class SymmetricRandomDelayLink { |
| 49 | public: |
| 50 | SymmetricRandomDelayLink(Simulator* simulator, |
| 51 | std::string name, |
| 52 | UnconstrainedPortInterface* sink_a, |
| 53 | UnconstrainedPortInterface* sink_b, |
| 54 | QuicBandwidth bandwidth, |
| 55 | QuicTime::Delta propagation_delay); |
| 56 | SymmetricRandomDelayLink(Endpoint* endpoint_a, |
| 57 | Endpoint* endpoint_b, |
| 58 | QuicBandwidth bandwidth, |
| 59 | QuicTime::Delta propagation_delay); |
| 60 | SymmetricRandomDelayLink(const SymmetricRandomDelayLink&) = delete; |
| 61 | SymmetricRandomDelayLink& operator=(const SymmetricRandomDelayLink&) = delete; |
| 62 | |
| 63 | inline QuicBandwidth bandwidth() { return a_to_b_link_.bandwidth(); } |
| 64 | |
| 65 | inline void set_median_random_delay(QuicTime::Delta delay) { |
| 66 | a_to_b_link_.set_median_random_delay(delay); |
| 67 | b_to_a_link_.set_median_random_delay(delay); |
| 68 | } |
| 69 | |
| 70 | private: |
| 71 | RandomDelayLink a_to_b_link_; |
| 72 | RandomDelayLink b_to_a_link_; |
| 73 | }; |
| 74 | |
| 75 | } // namespace simulator |
| 76 | } // namespace quic |
| 77 | |
| 78 | #endif // QUICHE_QUIC_QUARTC_TEST_RANDOM_DELAY_LINK_H_ |