| // Copyright (c) 2021 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 QUICHE_QUIC_TOOLS_WEB_TRANSPORT_TEST_VISITORS_H_ |
| #define QUICHE_QUIC_TOOLS_WEB_TRANSPORT_TEST_VISITORS_H_ |
| |
| #include <string> |
| |
| #include "quiche/quic/core/web_transport_interface.h" |
| #include "quiche/quic/platform/api/quic_logging.h" |
| #include "quiche/common/platform/api/quiche_logging.h" |
| #include "quiche/common/platform/api/quiche_mem_slice.h" |
| #include "quiche/common/quiche_circular_deque.h" |
| #include "quiche/common/simple_buffer_allocator.h" |
| #include "quiche/spdy/core/http2_header_block.h" |
| |
| namespace quic { |
| |
| // Discards any incoming data. |
| class WebTransportDiscardVisitor : public WebTransportStreamVisitor { |
| public: |
| WebTransportDiscardVisitor(WebTransportStream* stream) : stream_(stream) {} |
| |
| void OnCanRead() override { |
| std::string buffer; |
| WebTransportStream::ReadResult result = stream_->Read(&buffer); |
| QUIC_DVLOG(2) << "Read " << result.bytes_read |
| << " bytes from WebTransport stream " |
| << stream_->GetStreamId() << ", fin: " << result.fin; |
| } |
| |
| void OnCanWrite() override {} |
| |
| void OnResetStreamReceived(WebTransportStreamError /*error*/) override {} |
| void OnStopSendingReceived(WebTransportStreamError /*error*/) override {} |
| void OnWriteSideInDataRecvdState() override {} |
| |
| private: |
| WebTransportStream* stream_; |
| }; |
| |
| // Echoes any incoming data back on the same stream. |
| class WebTransportBidirectionalEchoVisitor : public WebTransportStreamVisitor { |
| public: |
| WebTransportBidirectionalEchoVisitor(WebTransportStream* stream) |
| : stream_(stream) {} |
| |
| void OnCanRead() override { |
| WebTransportStream::ReadResult result = stream_->Read(&buffer_); |
| QUIC_DVLOG(1) << "Attempted reading on WebTransport bidirectional stream " |
| << stream_->GetStreamId() |
| << ", bytes read: " << result.bytes_read; |
| if (result.fin) { |
| send_fin_ = true; |
| } |
| OnCanWrite(); |
| } |
| |
| void OnCanWrite() override { |
| if (stop_sending_received_) { |
| return; |
| } |
| |
| if (!buffer_.empty()) { |
| bool success = stream_->Write(buffer_); |
| QUIC_DVLOG(1) << "Attempted writing on WebTransport bidirectional stream " |
| << stream_->GetStreamId() |
| << ", success: " << (success ? "yes" : "no"); |
| if (!success) { |
| return; |
| } |
| |
| buffer_ = ""; |
| } |
| |
| if (send_fin_) { |
| bool success = stream_->SendFin(); |
| QUICHE_DCHECK(success); |
| } |
| } |
| |
| void OnResetStreamReceived(WebTransportStreamError /*error*/) override { |
| // Send FIN in response to a stream reset. We want to test that we can |
| // operate one side of the stream cleanly while the other is reset, thus |
| // replying with a FIN rather than a RESET_STREAM is more appropriate here. |
| send_fin_ = true; |
| OnCanWrite(); |
| } |
| void OnStopSendingReceived(WebTransportStreamError /*error*/) override { |
| stop_sending_received_ = true; |
| } |
| void OnWriteSideInDataRecvdState() override {} |
| |
| protected: |
| WebTransportStream* stream() { return stream_; } |
| |
| private: |
| WebTransportStream* stream_; |
| std::string buffer_; |
| bool send_fin_ = false; |
| bool stop_sending_received_ = false; |
| }; |
| |
| // Buffers all of the data and calls |callback| with the entirety of the stream |
| // data. |
| class WebTransportUnidirectionalEchoReadVisitor |
| : public WebTransportStreamVisitor { |
| public: |
| using Callback = std::function<void(const std::string&)>; |
| |
| WebTransportUnidirectionalEchoReadVisitor(WebTransportStream* stream, |
| Callback callback) |
| : stream_(stream), callback_(std::move(callback)) {} |
| |
| void OnCanRead() override { |
| WebTransportStream::ReadResult result = stream_->Read(&buffer_); |
| QUIC_DVLOG(1) << "Attempted reading on WebTransport unidirectional stream " |
| << stream_->GetStreamId() |
| << ", bytes read: " << result.bytes_read; |
| if (result.fin) { |
| QUIC_DVLOG(1) << "Finished receiving data on a WebTransport stream " |
| << stream_->GetStreamId() << ", queueing up the echo"; |
| callback_(buffer_); |
| } |
| } |
| |
| void OnCanWrite() override { QUICHE_NOTREACHED(); } |
| |
| void OnResetStreamReceived(WebTransportStreamError /*error*/) override {} |
| void OnStopSendingReceived(WebTransportStreamError /*error*/) override {} |
| void OnWriteSideInDataRecvdState() override {} |
| |
| private: |
| WebTransportStream* stream_; |
| std::string buffer_; |
| Callback callback_; |
| }; |
| |
| // Sends supplied data. |
| class WebTransportUnidirectionalEchoWriteVisitor |
| : public WebTransportStreamVisitor { |
| public: |
| WebTransportUnidirectionalEchoWriteVisitor(WebTransportStream* stream, |
| const std::string& data) |
| : stream_(stream), data_(data) {} |
| |
| void OnCanRead() override { QUICHE_NOTREACHED(); } |
| void OnCanWrite() override { |
| if (data_.empty()) { |
| return; |
| } |
| if (!stream_->Write(data_)) { |
| return; |
| } |
| data_ = ""; |
| bool fin_sent = stream_->SendFin(); |
| QUICHE_DVLOG(1) |
| << "WebTransportUnidirectionalEchoWriteVisitor finished sending data."; |
| QUICHE_DCHECK(fin_sent); |
| } |
| |
| void OnResetStreamReceived(WebTransportStreamError /*error*/) override {} |
| void OnStopSendingReceived(WebTransportStreamError /*error*/) override {} |
| void OnWriteSideInDataRecvdState() override {} |
| |
| private: |
| WebTransportStream* stream_; |
| std::string data_; |
| }; |
| |
| // A session visitor which sets unidirectional or bidirectional stream visitors |
| // to echo. |
| class EchoWebTransportSessionVisitor : public WebTransportVisitor { |
| public: |
| EchoWebTransportSessionVisitor(WebTransportSession* session) |
| : session_(session) {} |
| |
| void OnSessionReady(const spdy::Http2HeaderBlock&) override { |
| if (session_->CanOpenNextOutgoingBidirectionalStream()) { |
| OnCanCreateNewOutgoingBidirectionalStream(); |
| } |
| } |
| |
| void OnSessionClosed(WebTransportSessionError /*error_code*/, |
| const std::string& /*error_message*/) override {} |
| |
| void OnIncomingBidirectionalStreamAvailable() override { |
| while (true) { |
| WebTransportStream* stream = |
| session_->AcceptIncomingBidirectionalStream(); |
| if (stream == nullptr) { |
| return; |
| } |
| QUIC_DVLOG(1) |
| << "EchoWebTransportSessionVisitor received a bidirectional stream " |
| << stream->GetStreamId(); |
| stream->SetVisitor( |
| std::make_unique<WebTransportBidirectionalEchoVisitor>(stream)); |
| stream->visitor()->OnCanRead(); |
| } |
| } |
| |
| void OnIncomingUnidirectionalStreamAvailable() override { |
| while (true) { |
| WebTransportStream* stream = |
| session_->AcceptIncomingUnidirectionalStream(); |
| if (stream == nullptr) { |
| return; |
| } |
| QUIC_DVLOG(1) |
| << "EchoWebTransportSessionVisitor received a unidirectional stream"; |
| stream->SetVisitor( |
| std::make_unique<WebTransportUnidirectionalEchoReadVisitor>( |
| stream, [this](const std::string& data) { |
| streams_to_echo_back_.push_back(data); |
| TrySendingUnidirectionalStreams(); |
| })); |
| stream->visitor()->OnCanRead(); |
| } |
| } |
| |
| void OnDatagramReceived(absl::string_view datagram) override { |
| quiche::QuicheMemSlice slice( |
| quiche::QuicheBuffer::Copy(&allocator_, datagram)); |
| session_->SendOrQueueDatagram(std::move(slice)); |
| } |
| |
| void OnCanCreateNewOutgoingBidirectionalStream() override { |
| if (!echo_stream_opened_) { |
| WebTransportStream* stream = session_->OpenOutgoingBidirectionalStream(); |
| stream->SetVisitor( |
| std::make_unique<WebTransportBidirectionalEchoVisitor>(stream)); |
| echo_stream_opened_ = true; |
| } |
| } |
| void OnCanCreateNewOutgoingUnidirectionalStream() override { |
| TrySendingUnidirectionalStreams(); |
| } |
| |
| void TrySendingUnidirectionalStreams() { |
| while (!streams_to_echo_back_.empty() && |
| session_->CanOpenNextOutgoingUnidirectionalStream()) { |
| QUIC_DVLOG(1) |
| << "EchoWebTransportServer echoed a unidirectional stream back"; |
| WebTransportStream* stream = session_->OpenOutgoingUnidirectionalStream(); |
| stream->SetVisitor( |
| std::make_unique<WebTransportUnidirectionalEchoWriteVisitor>( |
| stream, streams_to_echo_back_.front())); |
| streams_to_echo_back_.pop_front(); |
| stream->visitor()->OnCanWrite(); |
| } |
| } |
| |
| private: |
| WebTransportSession* session_; |
| quiche::SimpleBufferAllocator allocator_; |
| bool echo_stream_opened_ = false; |
| |
| quiche::QuicheCircularDeque<std::string> streams_to_echo_back_; |
| }; |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_TOOLS_WEB_TRANSPORT_TEST_VISITORS_H_ |