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conn_manager_impl.cc
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#include "common/http/conn_manager_impl.h"
#include <cstdint>
#include <functional>
#include <list>
#include <string>
#include <vector>
#include "envoy/buffer/buffer.h"
#include "envoy/common/time.h"
#include "envoy/event/dispatcher.h"
#include "envoy/network/drain_decision.h"
#include "envoy/router/router.h"
#include "envoy/ssl/connection.h"
#include "envoy/stats/scope.h"
#include "envoy/tracing/http_tracer.h"
#include "common/buffer/buffer_impl.h"
#include "common/common/assert.h"
#include "common/common/empty_string.h"
#include "common/common/enum_to_int.h"
#include "common/common/fmt.h"
#include "common/common/utility.h"
#include "common/http/codes.h"
#include "common/http/conn_manager_utility.h"
#include "common/http/exception.h"
#include "common/http/header_map_impl.h"
#include "common/http/headers.h"
#include "common/http/http1/codec_impl.h"
#include "common/http/http2/codec_impl.h"
#include "common/http/utility.h"
#include "common/network/utility.h"
namespace Envoy {
namespace Http {
ConnectionManagerStats ConnectionManagerImpl::generateStats(const std::string& prefix,
Stats::Scope& scope) {
return {
{ALL_HTTP_CONN_MAN_STATS(POOL_COUNTER_PREFIX(scope, prefix), POOL_GAUGE_PREFIX(scope, prefix),
POOL_HISTOGRAM_PREFIX(scope, prefix))},
prefix,
scope};
}
ConnectionManagerTracingStats ConnectionManagerImpl::generateTracingStats(const std::string& prefix,
Stats::Scope& scope) {
return {CONN_MAN_TRACING_STATS(POOL_COUNTER_PREFIX(scope, prefix + "tracing."))};
}
ConnectionManagerListenerStats
ConnectionManagerImpl::generateListenerStats(const std::string& prefix, Stats::Scope& scope) {
return {CONN_MAN_LISTENER_STATS(POOL_COUNTER_PREFIX(scope, prefix))};
}
ConnectionManagerImpl::ConnectionManagerImpl(ConnectionManagerConfig& config,
const Network::DrainDecision& drain_close,
Runtime::RandomGenerator& random_generator,
Tracing::HttpTracer& tracer, Runtime::Loader& runtime,
const LocalInfo::LocalInfo& local_info,
Upstream::ClusterManager& cluster_manager,
Server::OverloadManager* overload_manager,
Event::TimeSystem& time_system)
: config_(config), stats_(config_.stats()),
conn_length_(new Stats::Timespan(stats_.named_.downstream_cx_length_ms_, time_system)),
drain_close_(drain_close), random_generator_(random_generator), tracer_(tracer),
runtime_(runtime), local_info_(local_info), cluster_manager_(cluster_manager),
listener_stats_(config_.listenerStats()),
overload_stop_accepting_requests_ref_(
overload_manager ? overload_manager->getThreadLocalOverloadState().getState(
Server::OverloadActionNames::get().StopAcceptingRequests)
: Server::OverloadManager::getInactiveState()),
overload_disable_keepalive_ref_(
overload_manager ? overload_manager->getThreadLocalOverloadState().getState(
Server::OverloadActionNames::get().DisableHttpKeepAlive)
: Server::OverloadManager::getInactiveState()),
time_system_(time_system) {}
const HeaderMapImpl& ConnectionManagerImpl::continueHeader() {
CONSTRUCT_ON_FIRST_USE(HeaderMapImpl,
{Http::Headers::get().Status, std::to_string(enumToInt(Code::Continue))});
}
void ConnectionManagerImpl::initializeReadFilterCallbacks(Network::ReadFilterCallbacks& callbacks) {
read_callbacks_ = &callbacks;
stats_.named_.downstream_cx_total_.inc();
stats_.named_.downstream_cx_active_.inc();
if (read_callbacks_->connection().ssl()) {
stats_.named_.downstream_cx_ssl_total_.inc();
stats_.named_.downstream_cx_ssl_active_.inc();
}
read_callbacks_->connection().addConnectionCallbacks(*this);
if (config_.idleTimeout()) {
idle_timer_ = read_callbacks_->connection().dispatcher().createTimer(
[this]() -> void { onIdleTimeout(); });
idle_timer_->enableTimer(config_.idleTimeout().value());
}
read_callbacks_->connection().setDelayedCloseTimeout(config_.delayedCloseTimeout());
read_callbacks_->connection().setConnectionStats(
{stats_.named_.downstream_cx_rx_bytes_total_, stats_.named_.downstream_cx_rx_bytes_buffered_,
stats_.named_.downstream_cx_tx_bytes_total_, stats_.named_.downstream_cx_tx_bytes_buffered_,
nullptr, &stats_.named_.downstream_cx_delayed_close_timeout_});
}
ConnectionManagerImpl::~ConnectionManagerImpl() {
stats_.named_.downstream_cx_destroy_.inc();
stats_.named_.downstream_cx_active_.dec();
if (read_callbacks_->connection().ssl()) {
stats_.named_.downstream_cx_ssl_active_.dec();
}
if (codec_) {
if (codec_->protocol() == Protocol::Http2) {
stats_.named_.downstream_cx_http2_active_.dec();
} else {
if (isOldStyleWebSocketConnection()) {
stats_.named_.downstream_cx_websocket_active_.dec();
} else {
stats_.named_.downstream_cx_http1_active_.dec();
}
}
}
conn_length_->complete();
user_agent_.completeConnectionLength(*conn_length_);
}
void ConnectionManagerImpl::checkForDeferredClose() {
if (drain_state_ == DrainState::Closing && streams_.empty() && !codec_->wantsToWrite()) {
read_callbacks_->connection().close(Network::ConnectionCloseType::FlushWriteAndDelay);
}
}
void ConnectionManagerImpl::doEndStream(ActiveStream& stream) {
// The order of what happens in this routine is important and a little complicated. We first see
// if the stream needs to be reset. If it needs to be, this will end up invoking reset callbacks
// and then moving the stream to the deferred destruction list. If the stream has not been reset,
// we move it to the deferred deletion list here. Then, we potentially close the connection. This
// must be done after deleting the stream since the stream refers to the connection and must be
// deleted first.
bool reset_stream = false;
if (!stream.state_.remote_complete_ || !stream.state_.local_complete_) {
// Indicate local is complete at this point so that if we reset during a continuation, we don't
// raise further data or trailers.
stream.state_.local_complete_ = true;
stream.response_encoder_->getStream().resetStream(StreamResetReason::LocalReset);
reset_stream = true;
}
if (!reset_stream) {
doDeferredStreamDestroy(stream);
}
if (reset_stream && codec_->protocol() != Protocol::Http2) {
drain_state_ = DrainState::Closing;
}
checkForDeferredClose();
// Reading may have been disabled for the non-multiplexing case, so enable it again.
// Also be sure to unwind any read-disable done by the prior downstream
// connection.
if (drain_state_ != DrainState::Closing && codec_->protocol() != Protocol::Http2) {
while (!read_callbacks_->connection().readEnabled()) {
read_callbacks_->connection().readDisable(false);
}
}
if (idle_timer_ && streams_.empty()) {
idle_timer_->enableTimer(config_.idleTimeout().value());
}
}
void ConnectionManagerImpl::doDeferredStreamDestroy(ActiveStream& stream) {
if (stream.idle_timer_ != nullptr) {
stream.idle_timer_->disableTimer();
stream.idle_timer_ = nullptr;
}
stream.state_.destroyed_ = true;
for (auto& filter : stream.decoder_filters_) {
filter->handle_->onDestroy();
}
for (auto& filter : stream.encoder_filters_) {
// Do not call on destroy twice for dual registered filters.
if (!filter->dual_filter_) {
filter->handle_->onDestroy();
}
}
read_callbacks_->connection().dispatcher().deferredDelete(stream.removeFromList(streams_));
}
StreamDecoder& ConnectionManagerImpl::newStream(StreamEncoder& response_encoder) {
if (idle_timer_) {
idle_timer_->disableTimer();
}
ENVOY_CONN_LOG(debug, "new stream", read_callbacks_->connection());
ActiveStreamPtr new_stream(new ActiveStream(*this));
new_stream->response_encoder_ = &response_encoder;
new_stream->response_encoder_->getStream().addCallbacks(*new_stream);
new_stream->buffer_limit_ = new_stream->response_encoder_->getStream().bufferLimit();
// If the network connection is backed up, the stream should be made aware of it on creation.
// Both HTTP/1.x and HTTP/2 codecs handle this in StreamCallbackHelper::addCallbacks_.
ASSERT(read_callbacks_->connection().aboveHighWatermark() == false ||
new_stream->high_watermark_count_ > 0);
new_stream->moveIntoList(std::move(new_stream), streams_);
return **streams_.begin();
}
Network::FilterStatus ConnectionManagerImpl::onData(Buffer::Instance& data, bool end_stream) {
// Send the data through WebSocket handlers if this connection is a
// WebSocket connection. N.B. The first request from the client to Envoy
// will still be processed as a normal HTTP/1.1 request, where Envoy will
// detect the WebSocket upgrade and establish a connection to the
// upstream.
if (isOldStyleWebSocketConnection()) {
return ws_connection_->onData(data, end_stream);
}
if (!codec_) {
codec_ = config_.createCodec(read_callbacks_->connection(), data, *this);
if (codec_->protocol() == Protocol::Http2) {
stats_.named_.downstream_cx_http2_total_.inc();
stats_.named_.downstream_cx_http2_active_.inc();
} else {
stats_.named_.downstream_cx_http1_total_.inc();
stats_.named_.downstream_cx_http1_active_.inc();
}
}
bool redispatch;
do {
redispatch = false;
try {
codec_->dispatch(data);
} catch (const CodecProtocolException& e) {
// HTTP/1.1 codec has already sent a 400 response if possible. HTTP/2 codec has already sent
// GOAWAY.
ENVOY_CONN_LOG(debug, "dispatch error: {}", read_callbacks_->connection(), e.what());
stats_.named_.downstream_cx_protocol_error_.inc();
// In the protocol error case, we need to reset all streams now. Since we do a flush write and
// delayed close, the connection might stick around long enough for a pending stream to come
// back and try to encode.
resetAllStreams();
read_callbacks_->connection().close(Network::ConnectionCloseType::FlushWriteAndDelay);
return Network::FilterStatus::StopIteration;
}
// Processing incoming data may release outbound data so check for closure here as well.
checkForDeferredClose();
// The HTTP/1 codec will pause dispatch after a single message is complete. We want to
// either redispatch if there are no streams and we have more data. If we have a single
// complete non-WebSocket stream but have not responded yet we will pause socket reads
// to apply back pressure.
if (codec_->protocol() != Protocol::Http2) {
if (read_callbacks_->connection().state() == Network::Connection::State::Open &&
data.length() > 0 && streams_.empty()) {
redispatch = true;
}
if (!streams_.empty() && streams_.front()->state_.remote_complete_ &&
!isOldStyleWebSocketConnection()) {
read_callbacks_->connection().readDisable(true);
}
}
} while (redispatch);
return Network::FilterStatus::StopIteration;
}
void ConnectionManagerImpl::resetAllStreams() {
while (!streams_.empty()) {
// Mimic a downstream reset in this case.
streams_.front()->onResetStream(StreamResetReason::ConnectionTermination);
}
}
void ConnectionManagerImpl::onEvent(Network::ConnectionEvent event) {
if (event == Network::ConnectionEvent::LocalClose) {
stats_.named_.downstream_cx_destroy_local_.inc();
}
if (event == Network::ConnectionEvent::RemoteClose) {
stats_.named_.downstream_cx_destroy_remote_.inc();
}
if (event == Network::ConnectionEvent::RemoteClose ||
event == Network::ConnectionEvent::LocalClose) {
if (idle_timer_) {
idle_timer_->disableTimer();
idle_timer_.reset();
}
if (drain_timer_) {
drain_timer_->disableTimer();
drain_timer_.reset();
}
}
if (!streams_.empty()) {
if (event == Network::ConnectionEvent::LocalClose) {
stats_.named_.downstream_cx_destroy_local_active_rq_.inc();
}
if (event == Network::ConnectionEvent::RemoteClose) {
stats_.named_.downstream_cx_destroy_remote_active_rq_.inc();
}
stats_.named_.downstream_cx_destroy_active_rq_.inc();
user_agent_.onConnectionDestroy(event, true);
resetAllStreams();
}
}
void ConnectionManagerImpl::onGoAway() {
// Currently we do nothing with remote go away frames. In the future we can decide to no longer
// push resources if applicable.
}
void ConnectionManagerImpl::onIdleTimeout() {
ENVOY_CONN_LOG(debug, "idle timeout", read_callbacks_->connection());
stats_.named_.downstream_cx_idle_timeout_.inc();
if (!codec_) {
// No need to delay close after flushing since an idle timeout has already fired. Attempt to
// write out buffered data one last time and issue a local close if successful.
read_callbacks_->connection().close(Network::ConnectionCloseType::FlushWrite);
} else if (drain_state_ == DrainState::NotDraining) {
startDrainSequence();
}
}
void ConnectionManagerImpl::onDrainTimeout() {
ASSERT(drain_state_ != DrainState::NotDraining);
codec_->goAway();
drain_state_ = DrainState::Closing;
checkForDeferredClose();
}
void ConnectionManagerImpl::chargeTracingStats(const Tracing::Reason& tracing_reason,
ConnectionManagerTracingStats& tracing_stats) {
switch (tracing_reason) {
case Tracing::Reason::ClientForced:
tracing_stats.client_enabled_.inc();
break;
case Tracing::Reason::NotTraceableRequestId:
tracing_stats.not_traceable_.inc();
break;
case Tracing::Reason::Sampling:
tracing_stats.random_sampling_.inc();
break;
case Tracing::Reason::ServiceForced:
tracing_stats.service_forced_.inc();
break;
default:
throw std::invalid_argument(
fmt::format("invalid tracing reason, value: {}", static_cast<int32_t>(tracing_reason)));
}
}
ConnectionManagerImpl::ActiveStream::ActiveStream(ConnectionManagerImpl& connection_manager)
: connection_manager_(connection_manager),
snapped_route_config_(connection_manager.config_.routeConfigProvider().config()),
stream_id_(connection_manager.random_generator_.random()),
request_timer_(new Stats::Timespan(connection_manager_.stats_.named_.downstream_rq_time_,
connection_manager_.timeSystem())),
request_info_(connection_manager_.codec_->protocol(), connection_manager_.timeSystem()) {
connection_manager_.stats_.named_.downstream_rq_total_.inc();
connection_manager_.stats_.named_.downstream_rq_active_.inc();
if (connection_manager_.codec_->protocol() == Protocol::Http2) {
connection_manager_.stats_.named_.downstream_rq_http2_total_.inc();
} else {
connection_manager_.stats_.named_.downstream_rq_http1_total_.inc();
}
request_info_.setDownstreamLocalAddress(
connection_manager_.read_callbacks_->connection().localAddress());
// Initially, the downstream remote address is the source address of the
// downstream connection. That can change later in the request's lifecycle,
// based on XFF processing, but setting the downstream remote address here
// prevents surprises for logging code in edge cases.
request_info_.setDownstreamRemoteAddress(
connection_manager_.read_callbacks_->connection().remoteAddress());
if (connection_manager_.config_.streamIdleTimeout().count()) {
idle_timeout_ms_ = connection_manager_.config_.streamIdleTimeout();
idle_timer_ = connection_manager_.read_callbacks_->connection().dispatcher().createTimer(
[this]() -> void { onIdleTimeout(); });
resetIdleTimer();
}
request_info_.setRequestedServerName(
connection_manager_.read_callbacks_->connection().requestedServerName());
}
ConnectionManagerImpl::ActiveStream::~ActiveStream() {
request_info_.onRequestComplete();
connection_manager_.stats_.named_.downstream_rq_active_.dec();
for (const AccessLog::InstanceSharedPtr& access_log : connection_manager_.config_.accessLogs()) {
access_log->log(request_headers_.get(), response_headers_.get(), response_trailers_.get(),
request_info_);
}
for (const auto& log_handler : access_log_handlers_) {
log_handler->log(request_headers_.get(), response_headers_.get(), response_trailers_.get(),
request_info_);
}
if (request_info_.healthCheck()) {
connection_manager_.config_.tracingStats().health_check_.inc();
}
if (active_span_) {
Tracing::HttpTracerUtility::finalizeSpan(*active_span_, request_headers_.get(), request_info_,
*this);
}
ASSERT(state_.filter_call_state_ == 0);
}
void ConnectionManagerImpl::ActiveStream::resetIdleTimer() {
if (idle_timer_ != nullptr) {
// TODO(htuch): If this shows up in performance profiles, optimize by only
// updating a timestamp here and doing periodic checks for idle timeouts
// instead, or reducing the accuracy of timers.
idle_timer_->enableTimer(idle_timeout_ms_);
}
}
void ConnectionManagerImpl::ActiveStream::onIdleTimeout() {
connection_manager_.stats_.named_.downstream_rq_idle_timeout_.inc();
// If headers have not been sent to the user, send a 408.
if (response_headers_ != nullptr) {
// TODO(htuch): We could send trailers here with an x-envoy timeout header
// or gRPC status code, and/or set H2 RST_STREAM error.
connection_manager_.doEndStream(*this);
} else {
sendLocalReply(request_headers_ != nullptr &&
Grpc::Common::hasGrpcContentType(*request_headers_),
Http::Code::RequestTimeout, "stream timeout", nullptr, is_head_request_);
}
}
void ConnectionManagerImpl::ActiveStream::addStreamDecoderFilterWorker(
StreamDecoderFilterSharedPtr filter, bool dual_filter) {
ActiveStreamDecoderFilterPtr wrapper(new ActiveStreamDecoderFilter(*this, filter, dual_filter));
filter->setDecoderFilterCallbacks(*wrapper);
wrapper->moveIntoListBack(std::move(wrapper), decoder_filters_);
}
void ConnectionManagerImpl::ActiveStream::addStreamEncoderFilterWorker(
StreamEncoderFilterSharedPtr filter, bool dual_filter) {
ActiveStreamEncoderFilterPtr wrapper(new ActiveStreamEncoderFilter(*this, filter, dual_filter));
filter->setEncoderFilterCallbacks(*wrapper);
wrapper->moveIntoListBack(std::move(wrapper), encoder_filters_);
}
void ConnectionManagerImpl::ActiveStream::addAccessLogHandler(
AccessLog::InstanceSharedPtr handler) {
access_log_handlers_.push_back(handler);
}
void ConnectionManagerImpl::ActiveStream::chargeStats(const HeaderMap& headers) {
uint64_t response_code = Utility::getResponseStatus(headers);
request_info_.response_code_ = response_code;
if (request_info_.hc_request_) {
return;
}
connection_manager_.stats_.named_.downstream_rq_completed_.inc();
connection_manager_.listener_stats_.downstream_rq_completed_.inc();
if (CodeUtility::is1xx(response_code)) {
connection_manager_.stats_.named_.downstream_rq_1xx_.inc();
connection_manager_.listener_stats_.downstream_rq_1xx_.inc();
} else if (CodeUtility::is2xx(response_code)) {
connection_manager_.stats_.named_.downstream_rq_2xx_.inc();
connection_manager_.listener_stats_.downstream_rq_2xx_.inc();
} else if (CodeUtility::is3xx(response_code)) {
connection_manager_.stats_.named_.downstream_rq_3xx_.inc();
connection_manager_.listener_stats_.downstream_rq_3xx_.inc();
} else if (CodeUtility::is4xx(response_code)) {
connection_manager_.stats_.named_.downstream_rq_4xx_.inc();
connection_manager_.listener_stats_.downstream_rq_4xx_.inc();
} else if (CodeUtility::is5xx(response_code)) {
connection_manager_.stats_.named_.downstream_rq_5xx_.inc();
connection_manager_.listener_stats_.downstream_rq_5xx_.inc();
}
}
const Network::Connection* ConnectionManagerImpl::ActiveStream::connection() {
return &connection_manager_.read_callbacks_->connection();
}
void ConnectionManagerImpl::ActiveStream::decodeHeaders(HeaderMapPtr&& headers, bool end_stream) {
request_headers_ = std::move(headers);
if (Http::Headers::get().MethodValues.Head == request_headers_->Method()->value().c_str()) {
is_head_request_ = true;
}
// Drop new requests when overloaded as soon as we have decoded the headers.
if (connection_manager_.overload_stop_accepting_requests_ref_ ==
Server::OverloadActionState::Active) {
connection_manager_.stats_.named_.downstream_rq_overload_close_.inc();
sendLocalReply(Grpc::Common::hasGrpcContentType(*request_headers_),
Http::Code::ServiceUnavailable, "envoy overloaded", nullptr, is_head_request_);
return;
}
const bool upgrade_rejected = createFilterChain() == false;
maybeEndDecode(end_stream);
ENVOY_STREAM_LOG(debug, "request headers complete (end_stream={}):\n{}", *this, end_stream,
*request_headers_);
if (!connection_manager_.config_.proxy100Continue() && request_headers_->Expect() &&
request_headers_->Expect()->value() == Headers::get().ExpectValues._100Continue.c_str()) {
// Note in the case Envoy is handling 100-Continue complexity, it skips the filter chain
// and sends the 100-Continue directly to the encoder.
chargeStats(continueHeader());
response_encoder_->encode100ContinueHeaders(continueHeader());
// Remove the Expect header so it won't be handled again upstream.
request_headers_->removeExpect();
}
connection_manager_.user_agent_.initializeFromHeaders(
*request_headers_, connection_manager_.stats_.prefix_, connection_manager_.stats_.scope_);
// Make sure we are getting a codec version we support.
Protocol protocol = connection_manager_.codec_->protocol();
if (protocol == Protocol::Http10) {
// Assume this is HTTP/1.0. This is fine for HTTP/0.9 but this code will also affect any
// requests with non-standard version numbers (0.9, 1.3), basically anything which is not
// HTTP/1.1.
//
// The protocol may have shifted in the HTTP/1.0 case so reset it.
request_info_.protocol(protocol);
if (!connection_manager_.config_.http1Settings().accept_http_10_) {
// Send "Upgrade Required" if HTTP/1.0 support is not explicitly configured on.
sendLocalReply(false, Code::UpgradeRequired, "", nullptr, is_head_request_);
return;
} else {
// HTTP/1.0 defaults to single-use connections. Make sure the connection
// will be closed unless Keep-Alive is present.
state_.saw_connection_close_ = true;
if (request_headers_->Connection() &&
0 == StringUtil::caseInsensitiveCompare(
request_headers_->Connection()->value().c_str(),
Http::Headers::get().ConnectionValues.KeepAlive.c_str())) {
state_.saw_connection_close_ = false;
}
}
}
if (!request_headers_->Host()) {
if ((protocol == Protocol::Http10) &&
!connection_manager_.config_.http1Settings().default_host_for_http_10_.empty()) {
// Add a default host if configured to do so.
request_headers_->insertHost().value(
connection_manager_.config_.http1Settings().default_host_for_http_10_);
} else {
// Require host header. For HTTP/1.1 Host has already been translated to :authority.
sendLocalReply(Grpc::Common::hasGrpcContentType(*request_headers_), Code::BadRequest, "",
nullptr, is_head_request_);
return;
}
}
// Check for maximum incoming header size. Both codecs have some amount of checking for maximum
// header size. For HTTP/1.1 the entire headers data has be less than ~80K (hard coded in
// http_parser). For HTTP/2 the default allowed header block length is 64k.
// In order to have generally uniform behavior we also check total header size here and keep it
// under 60K. Ultimately it would be nice to have a configuration option ranging from the largest
// header size http_parser and nghttp2 will allow, down to 16k or 8k for
// envoy users who do not wish to proxy large headers.
if (request_headers_->byteSize() > (60 * 1024)) {
sendLocalReply(Grpc::Common::hasGrpcContentType(*request_headers_),
Code::RequestHeaderFieldsTooLarge, "", nullptr, is_head_request_);
return;
}
// Currently we only support relative paths at the application layer. We expect the codec to have
// broken the path into pieces if applicable. NOTE: Currently the HTTP/1.1 codec does not do this
// so we only support relative paths in all cases. https://tools.ietf.org/html/rfc7230#section-5.3
// We also need to check for the existence of :path because CONNECT does not have a path, and we
// don't support that currently.
if (!request_headers_->Path() || request_headers_->Path()->value().c_str()[0] != '/') {
connection_manager_.stats_.named_.downstream_rq_non_relative_path_.inc();
sendLocalReply(Grpc::Common::hasGrpcContentType(*request_headers_), Code::NotFound, "", nullptr,
is_head_request_);
return;
}
if (protocol == Protocol::Http11 && request_headers_->Connection() &&
0 ==
StringUtil::caseInsensitiveCompare(request_headers_->Connection()->value().c_str(),
Http::Headers::get().ConnectionValues.Close.c_str())) {
state_.saw_connection_close_ = true;
}
// Modify the downstream remote address depending on configuration and headers.
request_info_.setDownstreamRemoteAddress(ConnectionManagerUtility::mutateRequestHeaders(
*request_headers_, connection_manager_.read_callbacks_->connection(),
connection_manager_.config_, *snapped_route_config_, connection_manager_.random_generator_,
connection_manager_.runtime_, connection_manager_.local_info_));
ASSERT(request_info_.downstreamRemoteAddress() != nullptr);
ASSERT(!cached_route_);
refreshCachedRoute();
// Check for WebSocket upgrade request if the route exists, and supports WebSockets.
// TODO if there are no filters when starting a filter iteration, the connection manager
// should return 404. The current returns no response if there is no router filter.
if (protocol == Protocol::Http11 && cached_route_.value()) {
const Router::RouteEntry* route_entry = cached_route_.value()->routeEntry();
const bool old_style_websocket =
(route_entry != nullptr) && route_entry->useOldStyleWebSocket();
const bool websocket_requested = Utility::isWebSocketUpgradeRequest(*request_headers_);
if (websocket_requested && old_style_websocket) {
ENVOY_STREAM_LOG(debug, "found websocket connection. (end_stream={}):", *this, end_stream);
connection_manager_.ws_connection_ = route_entry->createWebSocketProxy(
*request_headers_, request_info_, *this, connection_manager_.cluster_manager_,
connection_manager_.read_callbacks_);
ASSERT(connection_manager_.ws_connection_ != nullptr);
connection_manager_.stats_.named_.downstream_cx_websocket_active_.inc();
connection_manager_.stats_.named_.downstream_cx_http1_active_.dec();
connection_manager_.stats_.named_.downstream_cx_websocket_total_.inc();
return;
} else if (upgrade_rejected) {
// Do not allow WebSocket upgrades if the route does not support it.
connection_manager_.stats_.named_.downstream_rq_ws_on_non_ws_route_.inc();
sendLocalReply(Grpc::Common::hasGrpcContentType(*request_headers_), Code::Forbidden, "",
nullptr, is_head_request_);
return;
}
// Allow non websocket requests to go through websocket enabled routes.
}
if (cached_route_.value()) {
const Router::RouteEntry* route_entry = cached_route_.value()->routeEntry();
if (route_entry != nullptr && route_entry->idleTimeout()) {
idle_timeout_ms_ = route_entry->idleTimeout().value();
if (idle_timeout_ms_.count()) {
// If we have a route-level idle timeout but no global stream idle timeout, create a timer.
if (idle_timer_ == nullptr) {
idle_timer_ = connection_manager_.read_callbacks_->connection().dispatcher().createTimer(
[this]() -> void { onIdleTimeout(); });
}
} else if (idle_timer_ != nullptr) {
// If we had a global stream idle timeout but the route-level idle timeout is set to zero
// (to override), we disable the idle timer.
idle_timer_->disableTimer();
idle_timer_ = nullptr;
}
}
}
// Check if tracing is enabled at all.
if (connection_manager_.config_.tracingConfig()) {
traceRequest();
}
decodeHeaders(nullptr, *request_headers_, end_stream);
// Reset it here for both global and overridden cases.
resetIdleTimer();
}
void ConnectionManagerImpl::ActiveStream::traceRequest() {
Tracing::Decision tracing_decision =
Tracing::HttpTracerUtility::isTracing(request_info_, *request_headers_);
ConnectionManagerImpl::chargeTracingStats(tracing_decision.reason,
connection_manager_.config_.tracingStats());
active_span_ = connection_manager_.tracer_.startSpan(*this, *request_headers_, request_info_,
tracing_decision);
if (!active_span_) {
return;
}
// TODO: Need to investigate the following code based on the cached route, as may
// be broken in the case a filter changes the route.
// If a decorator has been defined, apply it to the active span.
if (cached_route_.value() && cached_route_.value()->decorator()) {
cached_route_.value()->decorator()->apply(*active_span_);
// Cache decorated operation.
if (!cached_route_.value()->decorator()->getOperation().empty()) {
decorated_operation_ = &cached_route_.value()->decorator()->getOperation();
}
}
if (connection_manager_.config_.tracingConfig()->operation_name_ ==
Tracing::OperationName::Egress) {
// For egress (outbound) requests, pass the decorator's operation name (if defined)
// as a request header to enable the receiving service to use it in its server span.
if (decorated_operation_) {
request_headers_->insertEnvoyDecoratorOperation().value(*decorated_operation_);
}
} else {
const HeaderEntry* req_operation_override = request_headers_->EnvoyDecoratorOperation();
// For ingress (inbound) requests, if a decorator operation name has been provided, it
// should be used to override the active span's operation.
if (req_operation_override) {
if (!req_operation_override->value().empty()) {
active_span_->setOperation(req_operation_override->value().c_str());
// Clear the decorated operation so won't be used in the response header, as
// it has been overridden by the inbound decorator operation request header.
decorated_operation_ = nullptr;
}
// Remove header so not propagated to service
request_headers_->removeEnvoyDecoratorOperation();
}
}
// Inject the active span's tracing context into the request headers.
active_span_->injectContext(*request_headers_);
}
void ConnectionManagerImpl::ActiveStream::decodeHeaders(ActiveStreamDecoderFilter* filter,
HeaderMap& headers, bool end_stream) {
std::list<ActiveStreamDecoderFilterPtr>::iterator entry;
std::list<ActiveStreamDecoderFilterPtr>::iterator continue_data_entry = decoder_filters_.end();
if (!filter) {
entry = decoder_filters_.begin();
} else {
entry = std::next(filter->entry());
}
for (; entry != decoder_filters_.end(); entry++) {
ASSERT(!(state_.filter_call_state_ & FilterCallState::DecodeHeaders));
state_.filter_call_state_ |= FilterCallState::DecodeHeaders;
FilterHeadersStatus status = (*entry)->decodeHeaders(
headers, end_stream && continue_data_entry == decoder_filters_.end());
state_.filter_call_state_ &= ~FilterCallState::DecodeHeaders;
ENVOY_STREAM_LOG(trace, "decode headers called: filter={} status={}", *this,
static_cast<const void*>((*entry).get()), static_cast<uint64_t>(status));
if (!(*entry)->commonHandleAfterHeadersCallback(status) &&
std::next(entry) != decoder_filters_.end()) {
// Stop iteration IFF this is not the last filter. If it is the last filter, continue with
// processing since we need to handle the case where a terminal filter wants to buffer, but
// a previous filter has added body.
return;
}
// Here we handle the case where we have a header only request, but a filter adds a body
// to it. We need to not raise end_stream = true to further filters during inline iteration.
if (end_stream && buffered_request_data_ && continue_data_entry == decoder_filters_.end()) {
continue_data_entry = entry;
}
}
if (continue_data_entry != decoder_filters_.end()) {
// We use the continueDecoding() code since it will correctly handle not calling
// decodeHeaders() again. Fake setting stopped_ since the continueDecoding() code expects it.
ASSERT(buffered_request_data_);
(*continue_data_entry)->stopped_ = true;
(*continue_data_entry)->continueDecoding();
}
}
void ConnectionManagerImpl::ActiveStream::decodeData(Buffer::Instance& data, bool end_stream) {
maybeEndDecode(end_stream);
request_info_.addBytesReceived(data.length());
// If the initial websocket upgrade request had an HTTP body
// let's send this up
if (connection_manager_.isOldStyleWebSocketConnection()) {
if (data.length() > 0) {
connection_manager_.ws_connection_->onData(data, false);
}
return;
}
decodeData(nullptr, data, end_stream);
}
void ConnectionManagerImpl::ActiveStream::decodeData(ActiveStreamDecoderFilter* filter,
Buffer::Instance& data, bool end_stream) {
resetIdleTimer();
// If a response is complete or a reset has been sent, filters do not care about further body
// data. Just drop it.
if (state_.local_complete_) {
return;
}
std::list<ActiveStreamDecoderFilterPtr>::iterator entry;
auto trailers_added_entry = decoder_filters_.end();
const bool trailers_exists_at_start = request_trailers_ != nullptr;
if (!filter) {
entry = decoder_filters_.begin();
} else {
entry = std::next(filter->entry());
}
for (; entry != decoder_filters_.end(); entry++) {
ASSERT(!(state_.filter_call_state_ & FilterCallState::DecodeData));
// We check the request_trailers_ pointer here in case addDecodedTrailers
// is called in decodeData during a previous filter invocation, at which point we communicate to
// the current and future filters that the stream has not yet ended.
if (end_stream) {
state_.filter_call_state_ |= FilterCallState::LastDataFrame;
}
state_.filter_call_state_ |= FilterCallState::DecodeData;
FilterDataStatus status = (*entry)->handle_->decodeData(data, end_stream && !request_trailers_);
state_.filter_call_state_ &= ~FilterCallState::DecodeData;
if (end_stream) {
state_.filter_call_state_ &= ~FilterCallState::LastDataFrame;
}
ENVOY_STREAM_LOG(trace, "decode data called: filter={} status={}", *this,
static_cast<const void*>((*entry).get()), static_cast<uint64_t>(status));
if (!trailers_exists_at_start && request_trailers_ &&
trailers_added_entry == decoder_filters_.end()) {
trailers_added_entry = entry;
}
if (!(*entry)->commonHandleAfterDataCallback(status, data, state_.decoder_filters_streaming_) &&
std::next(entry) != decoder_filters_.end()) {
// Stop iteration IFF this is not the last filter. If it is the last filter, continue with
// processing since we need to handle the case where a terminal filter wants to buffer, but
// a previous filter has added trailers.
return;
}
}
// If trailers were adding during decodeData we need to trigger decodeTrailers in order
// to allow filters to process the trailers.
if (trailers_added_entry != decoder_filters_.end()) {
decodeTrailers(trailers_added_entry->get(), *request_trailers_);
}
}
HeaderMap& ConnectionManagerImpl::ActiveStream::addDecodedTrailers() {
// Trailers can only be added during the last data frame (i.e. end_stream = true).
ASSERT(state_.filter_call_state_ & FilterCallState::LastDataFrame);
// Trailers can only be added once.
ASSERT(!request_trailers_);
request_trailers_ = std::make_unique<HeaderMapImpl>();
return *request_trailers_;
}
void ConnectionManagerImpl::ActiveStream::addDecodedData(ActiveStreamDecoderFilter& filter,
Buffer::Instance& data, bool streaming) {
if (state_.filter_call_state_ == 0 ||
(state_.filter_call_state_ & FilterCallState::DecodeHeaders) ||
(state_.filter_call_state_ & FilterCallState::DecodeData)) {
// Make sure if this triggers watermarks, the correct action is taken.
state_.decoder_filters_streaming_ = streaming;
// If no call is happening or we are in the decode headers/data callback, buffer the data.
// Inline processing happens in the decodeHeaders() callback if necessary.
filter.commonHandleBufferData(data);
} else if (state_.filter_call_state_ & FilterCallState::DecodeTrailers) {
// In this case we need to inline dispatch the data to further filters. If those filters
// choose to buffer/stop iteration that's fine.
decodeData(&filter, data, false);
} else {
// TODO(mattklein123): Formalize error handling for filters and add tests. Should probably
// throw an exception here.
NOT_IMPLEMENTED_GCOVR_EXCL_LINE;
}
}
void ConnectionManagerImpl::ActiveStream::decodeTrailers(HeaderMapPtr&& trailers) {
resetIdleTimer();
maybeEndDecode(true);
request_trailers_ = std::move(trailers);
decodeTrailers(nullptr, *request_trailers_);
}
void ConnectionManagerImpl::ActiveStream::decodeTrailers(ActiveStreamDecoderFilter* filter,
HeaderMap& trailers) {
// See decodeData() above for why we check local_complete_ here.
if (state_.local_complete_) {
return;
}
std::list<ActiveStreamDecoderFilterPtr>::iterator entry;
if (!filter) {
entry = decoder_filters_.begin();
} else {
entry = std::next(filter->entry());
}
for (; entry != decoder_filters_.end(); entry++) {
ASSERT(!(state_.filter_call_state_ & FilterCallState::DecodeTrailers));
state_.filter_call_state_ |= FilterCallState::DecodeTrailers;
FilterTrailersStatus status = (*entry)->handle_->decodeTrailers(trailers);
state_.filter_call_state_ &= ~FilterCallState::DecodeTrailers;
ENVOY_STREAM_LOG(trace, "decode trailers called: filter={} status={}", *this,
static_cast<const void*>((*entry).get()), static_cast<uint64_t>(status));
if (!(*entry)->commonHandleAfterTrailersCallback(status)) {
return;
}
}
}
void ConnectionManagerImpl::ActiveStream::maybeEndDecode(bool end_stream) {
ASSERT(!state_.remote_complete_);
state_.remote_complete_ = end_stream;
if (end_stream) {
request_info_.onLastDownstreamRxByteReceived();
ENVOY_STREAM_LOG(debug, "request end stream", *this);
}
}
std::list<ConnectionManagerImpl::ActiveStreamEncoderFilterPtr>::iterator
ConnectionManagerImpl::ActiveStream::commonEncodePrefix(ActiveStreamEncoderFilter* filter,
bool end_stream) {
// Only do base state setting on the initial call. Subsequent calls for filtering do not touch
// the base state.
if (filter == nullptr) {
ASSERT(!state_.local_complete_);
state_.local_complete_ = end_stream;
}
if (!filter) {
return encoder_filters_.begin();
} else {
return std::next(filter->entry());
}
}
void ConnectionManagerImpl::startDrainSequence() {
ASSERT(drain_state_ == DrainState::NotDraining);
drain_state_ = DrainState::Draining;
codec_->shutdownNotice();
drain_timer_ = read_callbacks_->connection().dispatcher().createTimer(
[this]() -> void { onDrainTimeout(); });
drain_timer_->enableTimer(config_.drainTimeout());
}
void ConnectionManagerImpl::ActiveStream::refreshCachedRoute() {
Router::RouteConstSharedPtr route = snapped_route_config_->route(*request_headers_, stream_id_);
request_info_.route_entry_ = route ? route->routeEntry() : nullptr;
cached_route_ = std::move(route);
}
void ConnectionManagerImpl::ActiveStream::sendLocalReply(
bool is_grpc_request, Code code, const std::string& body,
std::function<void(HeaderMap& headers)> modify_headers, bool is_head_request) {
Utility::sendLocalReply(is_grpc_request,
[this, modify_headers](HeaderMapPtr&& headers, bool end_stream) -> void {
if (modify_headers != nullptr) {
modify_headers(*headers);
}
response_headers_ = std::move(headers);
// TODO: Start encoding from the last decoder filter that saw the
// request instead.
encodeHeaders(nullptr, *response_headers_, end_stream);
},
[this](Buffer::Instance& data, bool end_stream) -> void {
// TODO: Start encoding from the last decoder filter that saw the
// request instead.
encodeData(nullptr, data, end_stream);
},
state_.destroyed_, code, body, is_head_request);
}
void ConnectionManagerImpl::ActiveStream::encode100ContinueHeaders(
ActiveStreamEncoderFilter* filter, HeaderMap& headers) {
resetIdleTimer();
ASSERT(connection_manager_.config_.proxy100Continue());
// Make sure commonContinue continues encode100ContinueHeaders.
has_continue_headers_ = true;
// Similar to the block in encodeHeaders, run encode100ContinueHeaders on each
// filter. This is simpler than that case because 100 continue implies no
// end-stream, and because there are normal headers coming there's no need for
// complex continuation logic.
std::list<ActiveStreamEncoderFilterPtr>::iterator entry = commonEncodePrefix(filter, false);
for (; entry != encoder_filters_.end(); entry++) {
ASSERT(!(state_.filter_call_state_ & FilterCallState::Encode100ContinueHeaders));
state_.filter_call_state_ |= FilterCallState::Encode100ContinueHeaders;
FilterHeadersStatus status = (*entry)->handle_->encode100ContinueHeaders(headers);
state_.filter_call_state_ &= ~FilterCallState::Encode100ContinueHeaders;
ENVOY_STREAM_LOG(trace, "encode 100 continue headers called: filter={} status={}", *this,
static_cast<const void*>((*entry).get()), static_cast<uint64_t>(status));
if (!(*entry)->commonHandleAfter100ContinueHeadersCallback(status)) {
return;
}
}