/
upstream.h
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/
upstream.h
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#pragma once
#include "envoy/http/conn_pool.h"
#include "envoy/network/connection.h"
#include "envoy/tcp/conn_pool.h"
#include "envoy/tcp/upstream.h"
#include "envoy/upstream/load_balancer.h"
#include "envoy/upstream/thread_local_cluster.h"
#include "envoy/upstream/upstream.h"
#include "source/common/common/dump_state_utils.h"
#include "source/common/http/codec_client.h"
#include "source/common/router/header_parser.h"
namespace Envoy {
namespace TcpProxy {
class TcpConnPool : public GenericConnPool, public Tcp::ConnectionPool::Callbacks {
public:
TcpConnPool(Upstream::ThreadLocalCluster& thread_local_cluster,
Upstream::LoadBalancerContext* context,
Tcp::ConnectionPool::UpstreamCallbacks& upstream_callbacks);
~TcpConnPool() override;
bool valid() const { return conn_pool_data_.has_value(); }
// GenericConnPool
void newStream(GenericConnectionPoolCallbacks& callbacks) override;
// Tcp::ConnectionPool::Callbacks
void onPoolFailure(ConnectionPool::PoolFailureReason reason,
absl::string_view transport_failure_reason,
Upstream::HostDescriptionConstSharedPtr host) override;
void onPoolReady(Tcp::ConnectionPool::ConnectionDataPtr&& conn_data,
Upstream::HostDescriptionConstSharedPtr host) override;
private:
absl::optional<Upstream::TcpPoolData> conn_pool_data_{};
Tcp::ConnectionPool::Cancellable* upstream_handle_{};
GenericConnectionPoolCallbacks* callbacks_{};
Tcp::ConnectionPool::UpstreamCallbacks& upstream_callbacks_;
};
class HttpUpstream;
class HttpConnPool : public GenericConnPool, public Http::ConnectionPool::Callbacks {
public:
using TunnelingConfig =
envoy::extensions::filters::network::tcp_proxy::v3::TcpProxy_TunnelingConfig;
HttpConnPool(Upstream::ThreadLocalCluster& thread_local_cluster,
Upstream::LoadBalancerContext* context, const TunnelingConfig& config,
Tcp::ConnectionPool::UpstreamCallbacks& upstream_callbacks, Http::CodecType type);
~HttpConnPool() override;
// HTTP/3 upstreams are not supported at the moment.
bool valid() const { return conn_pool_data_.has_value() && type_ <= Http::CodecType::HTTP2; }
// GenericConnPool
void newStream(GenericConnectionPoolCallbacks& callbacks) override;
// Http::ConnectionPool::Callbacks,
void onPoolFailure(ConnectionPool::PoolFailureReason reason,
absl::string_view transport_failure_reason,
Upstream::HostDescriptionConstSharedPtr host) override;
void onPoolReady(Http::RequestEncoder& request_encoder,
Upstream::HostDescriptionConstSharedPtr host, const StreamInfo::StreamInfo& info,
absl::optional<Http::Protocol>) override;
class Callbacks {
public:
Callbacks(HttpConnPool& conn_pool, Upstream::HostDescriptionConstSharedPtr host,
Ssl::ConnectionInfoConstSharedPtr ssl_info)
: conn_pool_(&conn_pool), host_(host), ssl_info_(ssl_info) {}
virtual ~Callbacks() = default;
virtual void onSuccess(Http::RequestEncoder& request_encoder) {
ASSERT(conn_pool_ != nullptr);
conn_pool_->onGenericPoolReady(host_, request_encoder.getStream().connectionLocalAddress(),
ssl_info_);
}
virtual void onFailure() {
ASSERT(conn_pool_ != nullptr);
conn_pool_->callbacks_->onGenericPoolFailure(
ConnectionPool::PoolFailureReason::RemoteConnectionFailure, host_);
}
protected:
Callbacks() = default;
private:
HttpConnPool* conn_pool_{};
Upstream::HostDescriptionConstSharedPtr host_;
Ssl::ConnectionInfoConstSharedPtr ssl_info_;
};
private:
void onGenericPoolReady(Upstream::HostDescriptionConstSharedPtr& host,
const Network::Address::InstanceConstSharedPtr& local_address,
Ssl::ConnectionInfoConstSharedPtr ssl_info);
const TunnelingConfig config_;
Http::CodecType type_;
absl::optional<Upstream::HttpPoolData> conn_pool_data_{};
Http::ConnectionPool::Cancellable* upstream_handle_{};
GenericConnectionPoolCallbacks* callbacks_{};
Tcp::ConnectionPool::UpstreamCallbacks& upstream_callbacks_;
std::unique_ptr<HttpUpstream> upstream_;
};
class TcpUpstream : public GenericUpstream {
public:
TcpUpstream(Tcp::ConnectionPool::ConnectionDataPtr&& data,
Tcp::ConnectionPool::UpstreamCallbacks& callbacks);
// GenericUpstream
bool readDisable(bool disable) override;
void encodeData(Buffer::Instance& data, bool end_stream) override;
void addBytesSentCallback(Network::Connection::BytesSentCb cb) override;
Tcp::ConnectionPool::ConnectionData* onDownstreamEvent(Network::ConnectionEvent event) override;
private:
Tcp::ConnectionPool::ConnectionDataPtr upstream_conn_data_;
};
class HttpUpstream : public GenericUpstream, protected Http::StreamCallbacks {
public:
using TunnelingConfig =
envoy::extensions::filters::network::tcp_proxy::v3::TcpProxy_TunnelingConfig;
~HttpUpstream() override;
virtual bool isValidResponse(const Http::ResponseHeaderMap&) PURE;
void doneReading();
void doneWriting();
Http::ResponseDecoder& responseDecoder() { return response_decoder_; }
// GenericUpstream
bool readDisable(bool disable) override;
void encodeData(Buffer::Instance& data, bool end_stream) override;
void addBytesSentCallback(Network::Connection::BytesSentCb cb) override;
Tcp::ConnectionPool::ConnectionData* onDownstreamEvent(Network::ConnectionEvent event) override;
// Http::StreamCallbacks
void onResetStream(Http::StreamResetReason reason,
absl::string_view transport_failure_reason) override;
void onAboveWriteBufferHighWatermark() override;
void onBelowWriteBufferLowWatermark() override;
virtual void setRequestEncoder(Http::RequestEncoder& request_encoder, bool is_ssl) PURE;
void setConnPoolCallbacks(std::unique_ptr<HttpConnPool::Callbacks>&& callbacks) {
conn_pool_callbacks_ = std::move(callbacks);
}
protected:
HttpUpstream(Tcp::ConnectionPool::UpstreamCallbacks& callbacks, const TunnelingConfig& config);
void resetEncoder(Network::ConnectionEvent event, bool inform_downstream = true);
Http::RequestEncoder* request_encoder_{};
const TunnelingConfig config_;
std::unique_ptr<Envoy::Router::HeaderParser> header_parser_;
private:
class DecoderShim : public Http::ResponseDecoder {
public:
DecoderShim(HttpUpstream& parent) : parent_(parent) {}
// Http::ResponseDecoder
void decode100ContinueHeaders(Http::ResponseHeaderMapPtr&&) override {}
void decodeHeaders(Http::ResponseHeaderMapPtr&& headers, bool end_stream) override {
if (!parent_.isValidResponse(*headers) || end_stream) {
parent_.resetEncoder(Network::ConnectionEvent::LocalClose);
} else if (parent_.conn_pool_callbacks_ != nullptr) {
parent_.conn_pool_callbacks_->onSuccess(*parent_.request_encoder_);
parent_.conn_pool_callbacks_.reset();
}
}
void decodeData(Buffer::Instance& data, bool end_stream) override {
parent_.upstream_callbacks_.onUpstreamData(data, end_stream);
if (end_stream) {
parent_.doneReading();
}
}
void decodeTrailers(Http::ResponseTrailerMapPtr&&) override {}
void decodeMetadata(Http::MetadataMapPtr&&) override {}
void dumpState(std::ostream& os, int indent_level) const override {
DUMP_STATE_UNIMPLEMENTED(DecoderShim);
}
private:
HttpUpstream& parent_;
};
DecoderShim response_decoder_;
Tcp::ConnectionPool::UpstreamCallbacks& upstream_callbacks_;
bool read_half_closed_{};
bool write_half_closed_{};
// Used to defer onGenericPoolReady and onGenericPoolFailure to the reception
// of the CONNECT response or the resetEncoder.
std::unique_ptr<HttpConnPool::Callbacks> conn_pool_callbacks_;
};
class Http1Upstream : public HttpUpstream {
public:
Http1Upstream(Tcp::ConnectionPool::UpstreamCallbacks& callbacks, const TunnelingConfig& config);
void encodeData(Buffer::Instance& data, bool end_stream) override;
void setRequestEncoder(Http::RequestEncoder& request_encoder, bool is_ssl) override;
bool isValidResponse(const Http::ResponseHeaderMap& headers) override;
};
class Http2Upstream : public HttpUpstream {
public:
Http2Upstream(Tcp::ConnectionPool::UpstreamCallbacks& callbacks, const TunnelingConfig& config);
void setRequestEncoder(Http::RequestEncoder& request_encoder, bool is_ssl) override;
bool isValidResponse(const Http::ResponseHeaderMap& headers) override;
};
} // namespace TcpProxy
} // namespace Envoy