/proc/self/cwd/source/common/http/codec_client.h
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1 | | #pragma once |
2 | | |
3 | | #include <cstdint> |
4 | | #include <list> |
5 | | #include <memory> |
6 | | |
7 | | #include "envoy/common/random_generator.h" |
8 | | #include "envoy/event/deferred_deletable.h" |
9 | | #include "envoy/event/timer.h" |
10 | | #include "envoy/http/codec.h" |
11 | | #include "envoy/http/header_validator.h" |
12 | | #include "envoy/network/connection.h" |
13 | | #include "envoy/network/filter.h" |
14 | | #include "envoy/upstream/upstream.h" |
15 | | |
16 | | #include "source/common/common/assert.h" |
17 | | #include "source/common/common/linked_object.h" |
18 | | #include "source/common/common/logger.h" |
19 | | #include "source/common/http/codec_wrappers.h" |
20 | | #include "source/common/network/filter_impl.h" |
21 | | #include "source/common/runtime/runtime_features.h" |
22 | | |
23 | | namespace Envoy { |
24 | | namespace Http { |
25 | | |
26 | | /** |
27 | | * Callbacks specific to a codec client. |
28 | | */ |
29 | | class CodecClientCallbacks { |
30 | | public: |
31 | 2.37k | virtual ~CodecClientCallbacks() = default; |
32 | | |
33 | | // Called in onPreDecodeComplete |
34 | 2.26k | virtual void onStreamPreDecodeComplete() {} |
35 | | |
36 | | /** |
37 | | * Called every time an owned stream is destroyed, whether complete or not. |
38 | | */ |
39 | | virtual void onStreamDestroy() PURE; |
40 | | |
41 | | /** |
42 | | * Called when a stream is reset by the client. |
43 | | * @param reason supplies the reset reason. |
44 | | */ |
45 | | virtual void onStreamReset(StreamResetReason reason) PURE; |
46 | | }; |
47 | | |
48 | | /** |
49 | | * This is an HTTP client that multiple stream management and underlying connection management |
50 | | * across multiple HTTP codec types. |
51 | | */ |
52 | | class CodecClient : protected Logger::Loggable<Logger::Id::client>, |
53 | | public Http::ConnectionCallbacks, |
54 | | public Network::ConnectionCallbacks, |
55 | | public Event::DeferredDeletable { |
56 | | public: |
57 | | /** |
58 | | * Type of HTTP codec to use. |
59 | | */ |
60 | | // This is a legacy alias. |
61 | | using Type = Envoy::Http::CodecType; |
62 | | |
63 | | /** |
64 | | * Add a connection callback to the underlying network connection. |
65 | | */ |
66 | 21.9k | void addConnectionCallbacks(Network::ConnectionCallbacks& cb) { |
67 | 21.9k | connection_->addConnectionCallbacks(cb); |
68 | 21.9k | } |
69 | | |
70 | | /** |
71 | | * Return if half-close semantics are enabled on the underlying connection. |
72 | | */ |
73 | 0 | bool isHalfCloseEnabled() { return connection_->isHalfCloseEnabled(); } |
74 | | |
75 | | /** |
76 | | * Initialize all of the installed read filters on the underlying connection. |
77 | | * This effectively calls onNewConnection() on each of them. |
78 | | */ |
79 | 1.31k | void initializeReadFilters() { connection_->initializeReadFilters(); } |
80 | | |
81 | | /** |
82 | | * Close the underlying network connection. This is immediate and will not attempt to flush any |
83 | | * pending write data. |
84 | | */ |
85 | | void close(Network::ConnectionCloseType type = Network::ConnectionCloseType::NoFlush); |
86 | | |
87 | | /** |
88 | | * Send a codec level go away indication to the peer. |
89 | | */ |
90 | 0 | void goAway() { codec_->goAway(); } |
91 | | |
92 | | /** |
93 | | * @return the underlying connection ID. |
94 | | */ |
95 | 0 | uint64_t id() const { return connection_->id(); } |
96 | | |
97 | | /** |
98 | | * @return the underlying codec protocol. |
99 | | */ |
100 | 31.1k | Protocol protocol() { return codec_->protocol(); } |
101 | | |
102 | | /** |
103 | | * @return the underlying connection error. |
104 | | */ |
105 | 2.63k | absl::string_view connectionFailureReason() { return connection_->transportFailureReason(); } |
106 | | |
107 | | /** |
108 | | * @return size_t the number of outstanding requests that have not completed or been reset. |
109 | | */ |
110 | 45.3k | size_t numActiveRequests() { return active_requests_.size(); } |
111 | | |
112 | | /** |
113 | | * Create a new stream. Note: The CodecClient will NOT buffer multiple requests for HTTP1 |
114 | | * connections. Thus, calling newStream() before the previous request has been fully encoded |
115 | | * is an error. Pipelining is supported however. |
116 | | * @param response_decoder supplies the decoder to use for response callbacks. |
117 | | * @return StreamEncoder& the encoder to use for encoding the request. |
118 | | */ |
119 | | RequestEncoder& newStream(ResponseDecoder& response_decoder); |
120 | | |
121 | 1.32k | void setConnectionStats(const Network::Connection::ConnectionStats& stats) { |
122 | 1.32k | connection_->setConnectionStats(stats); |
123 | 1.32k | } |
124 | | |
125 | 2.37k | void setCodecClientCallbacks(CodecClientCallbacks& callbacks) { |
126 | 2.37k | codec_client_callbacks_ = &callbacks; |
127 | 2.37k | } |
128 | | |
129 | 23.0k | void setCodecConnectionCallbacks(Http::ConnectionCallbacks& callbacks) { |
130 | 23.0k | codec_callbacks_ = &callbacks; |
131 | 23.0k | } |
132 | | |
133 | 1 | bool remoteClosed() const { return remote_closed_; } |
134 | | |
135 | 1.10k | CodecType type() const { return type_; } |
136 | | |
137 | | // Note this is the L4 stream info, not L7. |
138 | 2.32k | StreamInfo::StreamInfo& streamInfo() { return connection_->streamInfo(); } |
139 | | |
140 | | /** |
141 | | * Connect to the host. |
142 | | * Needs to be called after codec_ is instantiated. |
143 | | */ |
144 | | void connect(); |
145 | | |
146 | | protected: |
147 | | /** |
148 | | * Create a codec client and connect to a remote host/port. |
149 | | * @param type supplies the codec type. |
150 | | * @param connection supplies the connection to communicate on. |
151 | | * @param host supplies the owning host. |
152 | | */ |
153 | | CodecClient(CodecType type, Network::ClientConnectionPtr&& connection, |
154 | | Upstream::HostDescriptionConstSharedPtr host, Event::Dispatcher& dispatcher); |
155 | | |
156 | | // Http::ConnectionCallbacks |
157 | 13.1k | void onGoAway(GoAwayErrorCode error_code) override { |
158 | 13.1k | if (codec_callbacks_) { |
159 | 13.1k | codec_callbacks_->onGoAway(error_code); |
160 | 13.1k | } |
161 | 13.1k | } |
162 | 2.43k | void onSettings(ReceivedSettings& settings) override { |
163 | 2.43k | if (codec_callbacks_) { |
164 | 2.43k | codec_callbacks_->onSettings(settings); |
165 | 2.43k | } |
166 | 2.43k | } |
167 | 0 | void onMaxStreamsChanged(uint32_t num_streams) override { |
168 | 0 | if (codec_callbacks_) { |
169 | 0 | codec_callbacks_->onMaxStreamsChanged(num_streams); |
170 | 0 | } |
171 | 0 | } |
172 | | |
173 | 0 | void onIdleTimeout() { |
174 | 0 | host_->cluster().trafficStats()->upstream_cx_idle_timeout_.inc(); |
175 | 0 | close(); |
176 | 0 | } |
177 | | |
178 | 54.1k | void disableIdleTimer() { |
179 | 54.1k | if (idle_timer_ != nullptr) { |
180 | 3.64k | idle_timer_->disableTimer(); |
181 | 3.64k | } |
182 | 54.1k | } |
183 | | |
184 | 29.7k | void enableIdleTimer() { |
185 | 29.7k | if (idle_timer_ != nullptr) { |
186 | 3.55k | idle_timer_->enableTimer(idle_timeout_.value()); |
187 | 3.55k | } |
188 | 29.7k | } |
189 | | |
190 | | const CodecType type_; |
191 | | // The order of host_, connection_, and codec_ matter as during destruction each can refer to |
192 | | // the previous, at least in tests. |
193 | | Upstream::HostDescriptionConstSharedPtr host_; |
194 | | Network::ClientConnectionPtr connection_; |
195 | | ClientConnectionPtr codec_; |
196 | | Event::TimerPtr idle_timer_; |
197 | | const absl::optional<std::chrono::milliseconds> idle_timeout_; |
198 | | |
199 | | private: |
200 | | /** |
201 | | * Wrapper read filter to drive incoming connection data into the codec. We could potentially |
202 | | * support other filters in the future. |
203 | | */ |
204 | | struct CodecReadFilter : public Network::ReadFilterBaseImpl { |
205 | 25.7k | CodecReadFilter(CodecClient& parent) : parent_(parent) {} |
206 | | |
207 | | // Network::ReadFilter |
208 | 11.3k | Network::FilterStatus onData(Buffer::Instance& data, bool end_stream) override { |
209 | 11.3k | parent_.onData(data); |
210 | 11.3k | if (end_stream && parent_.isHalfCloseEnabled()) { |
211 | | // Note that this results in the connection closed as if it was closed |
212 | | // locally, it would be more correct to convey the end stream to the |
213 | | // response decoder, but it would require some refactoring. |
214 | 0 | parent_.close(); |
215 | 0 | } |
216 | 11.3k | return Network::FilterStatus::StopIteration; |
217 | 11.3k | } |
218 | | |
219 | | CodecClient& parent_; |
220 | | }; |
221 | | |
222 | | struct ActiveRequest; |
223 | | |
224 | | /** |
225 | | * Wrapper for an outstanding request. Designed for handling stream multiplexing. |
226 | | */ |
227 | | struct ActiveRequest : LinkedObject<ActiveRequest>, |
228 | | public Event::DeferredDeletable, |
229 | | public StreamCallbacks, |
230 | | public ResponseDecoderWrapper, |
231 | | public RequestEncoderWrapper { |
232 | | ActiveRequest(CodecClient& parent, ResponseDecoder& inner) |
233 | | : ResponseDecoderWrapper(inner), RequestEncoderWrapper(nullptr), parent_(parent), |
234 | | header_validator_( |
235 | 28.4k | parent.host_->cluster().makeHeaderValidator(parent.codec_->protocol())) { |
236 | 28.4k | switch (parent.protocol()) { |
237 | 18.4k | case Protocol::Http10: |
238 | 25.0k | case Protocol::Http11: |
239 | | // HTTP/1.1 codec does not support half-close on the response completion. |
240 | 25.0k | wait_encode_complete_ = false; |
241 | 25.0k | break; |
242 | 3.38k | case Protocol::Http2: |
243 | 3.38k | case Protocol::Http3: |
244 | 3.38k | wait_encode_complete_ = true; |
245 | 3.38k | break; |
246 | 28.4k | } |
247 | 28.4k | } Unexecuted instantiation: Envoy::Http::CodecClient::ActiveRequest::ActiveRequest(Envoy::Http::CodecClient&, Envoy::Http::ResponseDecoder&) Envoy::Http::CodecClient::ActiveRequest::ActiveRequest(Envoy::Http::CodecClient&, Envoy::Http::ResponseDecoder&) Line | Count | Source | 235 | 28.4k | parent.host_->cluster().makeHeaderValidator(parent.codec_->protocol())) { | 236 | 28.4k | switch (parent.protocol()) { | 237 | 18.4k | case Protocol::Http10: | 238 | 25.0k | case Protocol::Http11: | 239 | | // HTTP/1.1 codec does not support half-close on the response completion. | 240 | 25.0k | wait_encode_complete_ = false; | 241 | 25.0k | break; | 242 | 3.38k | case Protocol::Http2: | 243 | 3.38k | case Protocol::Http3: | 244 | 3.38k | wait_encode_complete_ = true; | 245 | 3.38k | break; | 246 | 28.4k | } | 247 | 28.4k | } |
|
248 | | |
249 | | void decodeHeaders(ResponseHeaderMapPtr&& headers, bool end_stream) override; |
250 | | |
251 | | // StreamCallbacks |
252 | 20.4k | void onResetStream(StreamResetReason reason, absl::string_view) override { |
253 | 20.4k | parent_.onReset(*this, reason); |
254 | 20.4k | } |
255 | 0 | void onAboveWriteBufferHighWatermark() override {} |
256 | 0 | void onBelowWriteBufferLowWatermark() override {} |
257 | | |
258 | | // StreamDecoderWrapper |
259 | 8.14k | void onPreDecodeComplete() override { parent_.responsePreDecodeComplete(*this); } |
260 | 8.14k | void onDecodeComplete() override {} |
261 | | |
262 | | // RequestEncoderWrapper |
263 | 28.3k | void onEncodeComplete() override { parent_.requestEncodeComplete(*this); } |
264 | | |
265 | | // RequestEncoder |
266 | | Status encodeHeaders(const RequestHeaderMap& headers, bool end_stream) override; |
267 | | |
268 | 28.4k | void setEncoder(RequestEncoder& encoder) { |
269 | 28.4k | inner_encoder_ = &encoder; |
270 | 28.4k | inner_encoder_->getStream().addCallbacks(*this); |
271 | 28.4k | } |
272 | | |
273 | 8.05k | void removeEncoderCallbacks() { inner_encoder_->getStream().removeCallbacks(*this); } |
274 | | |
275 | | CodecClient& parent_; |
276 | | Http::ClientHeaderValidatorPtr header_validator_; |
277 | | bool wait_encode_complete_{true}; |
278 | | bool encode_complete_{false}; |
279 | | bool decode_complete_{false}; |
280 | | }; |
281 | | |
282 | | using ActiveRequestPtr = std::unique_ptr<ActiveRequest>; |
283 | | |
284 | | /** |
285 | | * Called when a response finishes decoding. This is called *before* forwarding on to the |
286 | | * wrapped decoder. |
287 | | */ |
288 | | void responsePreDecodeComplete(ActiveRequest& request); |
289 | | void requestEncodeComplete(ActiveRequest& request); |
290 | | void completeRequest(ActiveRequest& request); |
291 | | |
292 | | void deleteRequest(ActiveRequest& request); |
293 | | void onReset(ActiveRequest& request, StreamResetReason reason); |
294 | | void onData(Buffer::Instance& data); |
295 | | |
296 | | // Network::ConnectionCallbacks |
297 | | void onEvent(Network::ConnectionEvent event) override; |
298 | | // Pass watermark events from the connection on to the codec which will pass it to the underlying |
299 | | // streams. |
300 | 0 | void onAboveWriteBufferHighWatermark() override { |
301 | 0 | codec_->onUnderlyingConnectionAboveWriteBufferHighWatermark(); |
302 | 0 | } |
303 | 0 | void onBelowWriteBufferLowWatermark() override { |
304 | 0 | codec_->onUnderlyingConnectionBelowWriteBufferLowWatermark(); |
305 | 0 | } |
306 | | |
307 | | std::list<ActiveRequestPtr> active_requests_; |
308 | | Http::ConnectionCallbacks* codec_callbacks_{}; |
309 | | CodecClientCallbacks* codec_client_callbacks_{}; |
310 | | bool connected_{}; |
311 | | bool remote_closed_{}; |
312 | | bool protocol_error_{false}; |
313 | | bool connect_called_{false}; |
314 | | }; |
315 | | |
316 | | using CodecClientPtr = std::unique_ptr<CodecClient>; |
317 | | |
318 | | /** |
319 | | * Production implementation that installs a real codec without automatically connecting. |
320 | | * TODO(danzh) deprecate this class and make CodecClientProd to have the option to defer connect |
321 | | * once "envoy.reloadable_features.postpone_h3_client_connect_to_next_loop" is deprecated. |
322 | | */ |
323 | | class NoConnectCodecClientProd : public CodecClient { |
324 | | public: |
325 | | NoConnectCodecClientProd(CodecType type, Network::ClientConnectionPtr&& connection, |
326 | | Upstream::HostDescriptionConstSharedPtr host, |
327 | | Event::Dispatcher& dispatcher, Random::RandomGenerator& random_generator, |
328 | | const Network::TransportSocketOptionsConstSharedPtr& options); |
329 | | }; |
330 | | |
331 | | /** |
332 | | * Production implementation that installs a real codec. |
333 | | */ |
334 | | class CodecClientProd : public NoConnectCodecClientProd { |
335 | | public: |
336 | | CodecClientProd(CodecType type, Network::ClientConnectionPtr&& connection, |
337 | | Upstream::HostDescriptionConstSharedPtr host, Event::Dispatcher& dispatcher, |
338 | | Random::RandomGenerator& random_generator, |
339 | | const Network::TransportSocketOptionsConstSharedPtr& options); |
340 | | }; |
341 | | |
342 | | } // namespace Http |
343 | | } // namespace Envoy |