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listener_builder.go
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/
listener_builder.go
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/*
* 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 listeners
import (
envoy_listener_v3 "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
"github.com/pkg/errors"
)
import (
core_xds "github.com/apache/dubbo-kubernetes/pkg/core/xds"
"github.com/apache/dubbo-kubernetes/pkg/xds/envoy"
v3 "github.com/apache/dubbo-kubernetes/pkg/xds/envoy/listeners/v3"
envoy_names "github.com/apache/dubbo-kubernetes/pkg/xds/envoy/names"
)
// ListenerBuilderOpt is a configuration option for ListenerBuilder.
//
// The goal of ListenerBuilderOpt is to facilitate fluent ListenerBuilder API.
type ListenerBuilderOpt interface {
// ApplyTo adds ListenerConfigurer(s) to the ListenerBuilder.
ApplyTo(builder *ListenerBuilder)
}
func NewListenerBuilder(apiVersion core_xds.APIVersion, name string) *ListenerBuilder {
return &ListenerBuilder{
apiVersion: apiVersion,
name: name,
}
}
// NewInboundListenerBuilder creates an Inbound ListenBuilder
// with a default name: inbound:address:port
func NewInboundListenerBuilder(
apiVersion core_xds.APIVersion,
address string,
port uint32,
protocol core_xds.SocketAddressProtocol,
) *ListenerBuilder {
listenerName := envoy_names.GetInboundListenerName(address, port)
return NewListenerBuilder(apiVersion, listenerName).
Configure(InboundListener(address, port, protocol))
}
// NewOutboundListenerBuilder creates an Outbound ListenBuilder
// with a default name: outbound:address:port
func NewOutboundListenerBuilder(
apiVersion core_xds.APIVersion,
address string,
port uint32,
protocol core_xds.SocketAddressProtocol,
) *ListenerBuilder {
listenerName := envoy_names.GetOutboundListenerName(address, port)
return NewListenerBuilder(apiVersion, listenerName).
Configure(OutboundListener(address, port, protocol))
}
func (b *ListenerBuilder) WithOverwriteName(name string) *ListenerBuilder {
b.name = name
return b
}
// ListenerBuilder is responsible for generating an Envoy listener
// by applying a series of ListenerConfigurers.
type ListenerBuilder struct {
apiVersion core_xds.APIVersion
configurers []v3.ListenerConfigurer
name string
}
// Configure configures ListenerBuilder by adding individual ListenerConfigurers.
func (b *ListenerBuilder) Configure(opts ...ListenerBuilderOpt) *ListenerBuilder {
for _, opt := range opts {
opt.ApplyTo(b)
}
return b
}
// Build generates an Envoy listener by applying a series of ListenerConfigurers.
func (b *ListenerBuilder) Build() (envoy.NamedResource, error) {
switch b.apiVersion {
case core_xds.APIVersion(envoy.APIV3):
listener := envoy_listener_v3.Listener{
Name: b.name,
}
for _, configurer := range b.configurers {
if err := configurer.Configure(&listener); err != nil {
return nil, err
}
}
if listener.GetName() == "" {
return nil, errors.New("listener name is required, but it was not provided")
}
return &listener, nil
default:
return nil, errors.New("unknown API")
}
}
func (b *ListenerBuilder) MustBuild() envoy.NamedResource {
listener, err := b.Build()
if err != nil {
panic(errors.Wrap(err, "failed to build Envoy Listener").Error())
}
return listener
}
func (b *ListenerBuilder) GetName() string {
return b.name
}
// AddConfigurer appends a given ListenerConfigurer to the end of the chain.
func (b *ListenerBuilder) AddConfigurer(configurer v3.ListenerConfigurer) {
b.configurers = append(b.configurers, configurer)
}
// ListenerBuilderOptFunc is a convenience type adapter.
type ListenerBuilderOptFunc func(builder *ListenerBuilder)
func (f ListenerBuilderOptFunc) ApplyTo(builder *ListenerBuilder) {
if f != nil {
f(builder)
}
}
// AddListenerConfigurer produces an option that applies the given
// configurer to the listener.
func AddListenerConfigurer(c v3.ListenerConfigurer) ListenerBuilderOpt {
return ListenerBuilderOptFunc(func(builder *ListenerBuilder) {
builder.AddConfigurer(c)
})
}