pkg/xds/envoy/clusters/v3/http2_configurer.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package clusters

import (
	envoy_cluster "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
	envoy_core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	envoy_upstream_http "github.com/envoyproxy/go-control-plane/envoy/extensions/upstreams/http/v3"
)

import (
	util_proto "github.com/apache/dubbo-kubernetes/pkg/util/proto"
)

// Window size defaults.
const (
	DefaultInitialStreamWindowSize     = 64 * 1024
	DefaultInitialConnectionWindowSize = 1024 * 1024
)

type Http2Configurer struct {
	EdgeProxyWindowSizes bool
}

var _ ClusterConfigurer = &Http2Configurer{}

func (p *Http2Configurer) Configure(c *envoy_cluster.Cluster) error {
	return UpdateCommonHttpProtocolOptions(c, func(options *envoy_upstream_http.HttpProtocolOptions) {
		opts := &envoy_core.Http2ProtocolOptions{}

		// These are from Envoy's best practices for edge proxy configuration:
		// https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/edge
		if p.EdgeProxyWindowSizes {
			opts.InitialStreamWindowSize = util_proto.UInt32(DefaultInitialStreamWindowSize)
			opts.InitialConnectionWindowSize = util_proto.UInt32(DefaultInitialConnectionWindowSize)
		}

		if options.UpstreamProtocolOptions == nil {
			options.UpstreamProtocolOptions = &envoy_upstream_http.HttpProtocolOptions_ExplicitHttpConfig_{
				ExplicitHttpConfig: &envoy_upstream_http.HttpProtocolOptions_ExplicitHttpConfig{
					ProtocolConfig: &envoy_upstream_http.HttpProtocolOptions_ExplicitHttpConfig_Http2ProtocolOptions{
						Http2ProtocolOptions: opts,
					},
				},
			}
		}
	})
}