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codec_client.cc
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codec_client.cc
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#include "common/http/codec_client.h"
#include <cstdint>
#include <memory>
#include "envoy/http/codec.h"
#include "common/common/enum_to_int.h"
#include "common/config/utility.h"
#include "common/http/exception.h"
#include "common/http/http1/codec_impl.h"
#include "common/http/http2/codec_impl.h"
#include "common/http/http3/quic_codec_factory.h"
#include "common/http/http3/well_known_names.h"
#include "common/http/status.h"
#include "common/http/utility.h"
namespace Envoy {
namespace Http {
CodecClient::CodecClient(Type type, Network::ClientConnectionPtr&& connection,
Upstream::HostDescriptionConstSharedPtr host,
Event::Dispatcher& dispatcher)
: type_(type), connection_(std::move(connection)), host_(host),
idle_timeout_(host_->cluster().idleTimeout()) {
if (type_ != Type::HTTP3) {
// Make sure upstream connections process data and then the FIN, rather than processing
// TCP disconnects immediately. (see https://github.com/envoyproxy/envoy/issues/1679 for
// details)
connection_->detectEarlyCloseWhenReadDisabled(false);
}
connection_->addConnectionCallbacks(*this);
connection_->addReadFilter(Network::ReadFilterSharedPtr{new CodecReadFilter(*this)});
ENVOY_CONN_LOG(debug, "connecting", *connection_);
connection_->connect();
if (idle_timeout_) {
idle_timer_ = dispatcher.createTimer([this]() -> void { onIdleTimeout(); });
enableIdleTimer();
}
// We just universally set no delay on connections. Theoretically we might at some point want
// to make this configurable.
connection_->noDelay(true);
}
CodecClient::~CodecClient() = default;
void CodecClient::close() { connection_->close(Network::ConnectionCloseType::NoFlush); }
void CodecClient::deleteRequest(ActiveRequest& request) {
connection_->dispatcher().deferredDelete(request.removeFromList(active_requests_));
if (codec_client_callbacks_) {
codec_client_callbacks_->onStreamDestroy();
}
if (numActiveRequests() == 0) {
enableIdleTimer();
}
}
RequestEncoder& CodecClient::newStream(ResponseDecoder& response_decoder) {
ActiveRequestPtr request(new ActiveRequest(*this, response_decoder));
request->encoder_ = &codec_->newStream(*request);
request->encoder_->getStream().addCallbacks(*request);
request->moveIntoList(std::move(request), active_requests_);
disableIdleTimer();
return *active_requests_.front()->encoder_;
}
void CodecClient::onEvent(Network::ConnectionEvent event) {
if (event == Network::ConnectionEvent::Connected) {
ENVOY_CONN_LOG(debug, "connected", *connection_);
connection_->streamInfo().setDownstreamSslConnection(connection_->ssl());
connected_ = true;
}
if (event == Network::ConnectionEvent::RemoteClose) {
remote_closed_ = true;
}
// HTTP/1 can signal end of response by disconnecting. We need to handle that case.
if (type_ == Type::HTTP1 && event == Network::ConnectionEvent::RemoteClose &&
!active_requests_.empty()) {
Buffer::OwnedImpl empty;
onData(empty);
}
if (event == Network::ConnectionEvent::RemoteClose ||
event == Network::ConnectionEvent::LocalClose) {
ENVOY_CONN_LOG(debug, "disconnect. resetting {} pending requests", *connection_,
active_requests_.size());
disableIdleTimer();
idle_timer_.reset();
while (!active_requests_.empty()) {
// Fake resetting all active streams so that reset() callbacks get invoked.
active_requests_.front()->encoder_->getStream().resetStream(
connected_ ? StreamResetReason::ConnectionTermination
: StreamResetReason::ConnectionFailure);
}
}
}
void CodecClient::responseDecodeComplete(ActiveRequest& request) {
ENVOY_CONN_LOG(debug, "response complete", *connection_);
deleteRequest(request);
// HTTP/2 can send us a reset after a complete response if the request was not complete. Users
// of CodecClient will deal with the premature response case and we should not handle any
// further reset notification.
request.encoder_->getStream().removeCallbacks(request);
}
void CodecClient::onReset(ActiveRequest& request, StreamResetReason reason) {
ENVOY_CONN_LOG(debug, "request reset", *connection_);
if (codec_client_callbacks_) {
codec_client_callbacks_->onStreamReset(reason);
}
deleteRequest(request);
}
void CodecClient::onData(Buffer::Instance& data) {
bool protocol_error = false;
Envoy::Http::Status status;
try {
status = codec_->dispatch(data);
// Exception removal is still in migration. Soon we won't need to catch these exceptions, as
// they'll be propagated through the callbacks and returned from dispatch.
} catch (CodecProtocolException& e) {
status = Envoy::Http::codecProtocolError(e.what());
} catch (PrematureResponseException& e) {
status = Envoy::Http::prematureResponseError(e.what(), e.responseCode());
}
if (Envoy::Http::isCodecProtocolError(status)) {
ENVOY_CONN_LOG(debug, "protocol error: {}", *connection_, status.message());
close();
protocol_error = true;
} else if (Envoy::Http::isPrematureResponseError(status)) {
ENVOY_CONN_LOG(debug, "premature response", *connection_);
close();
// Don't count 408 responses where we have no active requests as protocol errors
if (!active_requests_.empty() ||
Envoy::Http::getPrematureResponseHttpCode(status) != Code::RequestTimeout) {
protocol_error = true;
}
}
if (protocol_error) {
host_->cluster().stats().upstream_cx_protocol_error_.inc();
}
}
CodecClientProd::CodecClientProd(Type type, Network::ClientConnectionPtr&& connection,
Upstream::HostDescriptionConstSharedPtr host,
Event::Dispatcher& dispatcher)
: CodecClient(type, std::move(connection), host, dispatcher) {
switch (type) {
case Type::HTTP1: {
codec_ = std::make_unique<Http1::ClientConnectionImpl>(
*connection_, host->cluster().statsScope(), *this, host->cluster().http1Settings(),
host->cluster().maxResponseHeadersCount());
break;
}
case Type::HTTP2: {
codec_ = std::make_unique<Http2::ClientConnectionImpl>(
*connection_, *this, host->cluster().statsScope(), host->cluster().http2Options(),
Http::DEFAULT_MAX_REQUEST_HEADERS_KB, host->cluster().maxResponseHeadersCount(),
Http2::ProdNghttp2SessionFactory::get());
break;
}
case Type::HTTP3: {
codec_ = std::unique_ptr<ClientConnection>(
Config::Utility::getAndCheckFactoryByName<Http::QuicHttpClientConnectionFactory>(
Http::QuicCodecNames::get().Quiche)
.createQuicClientConnection(*connection_, *this));
}
}
}
} // namespace Http
} // namespace Envoy