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listener.go
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listener.go
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// Copyright © 2018 Heptio
// Licensed 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 envoy
import (
"sort"
"github.com/envoyproxy/go-control-plane/envoy/api/v2"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/auth"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/listener"
"github.com/envoyproxy/go-control-plane/pkg/util"
"github.com/gogo/protobuf/types"
"github.com/heptio/contour/internal/dag"
)
// TLSInspector returns a new TLS inspector listener filter.
func TLSInspector() listener.ListenerFilter {
return listener.ListenerFilter{
Name: util.TlsInspector,
ConfigType: &listener.ListenerFilter_Config{
Config: new(types.Struct),
},
}
}
// ProxyProtocol returns a new Proxy Protocol listener filter.
func ProxyProtocol() listener.ListenerFilter {
return listener.ListenerFilter{
Name: util.ProxyProtocol,
ConfigType: &listener.ListenerFilter_Config{
Config: new(types.Struct),
},
}
}
// Listener returns a new v2.Listener for the supplied address, port, and filters.
func Listener(name, address string, port int, lf []listener.ListenerFilter, filters ...listener.Filter) *v2.Listener {
l := &v2.Listener{
Name: name,
Address: *SocketAddress(address, port),
ListenerFilters: lf,
}
if len(filters) > 0 {
l.FilterChains = append(
l.FilterChains,
listener.FilterChain{
Filters: filters,
},
)
}
return l
}
// HTTPConnectionManager creates a new HTTP Connection Manager filter
// for the supplied route and access log.
func HTTPConnectionManager(routename, accessLogPath string) listener.Filter {
return listener.Filter{
Name: util.HTTPConnectionManager,
ConfigType: &listener.Filter_Config{
Config: &types.Struct{
Fields: map[string]*types.Value{
"stat_prefix": sv(routename),
"rds": st(map[string]*types.Value{
"route_config_name": sv(routename),
"config_source": st(map[string]*types.Value{
"api_config_source": st(map[string]*types.Value{
"api_type": sv("GRPC"),
"grpc_services": lv(
st(map[string]*types.Value{
"envoy_grpc": st(map[string]*types.Value{
"cluster_name": sv("contour"),
}),
}),
),
}),
}),
}),
"http_filters": lv(
st(map[string]*types.Value{
"name": sv(util.Gzip),
}),
st(map[string]*types.Value{
"name": sv(util.GRPCWeb),
}),
st(map[string]*types.Value{
"name": sv(util.Router),
}),
),
"http_protocol_options": st(map[string]*types.Value{
"accept_http_10": {Kind: &types.Value_BoolValue{BoolValue: true}},
}),
"access_log": accesslog(accessLogPath),
"use_remote_address": {Kind: &types.Value_BoolValue{BoolValue: true}}, // TODO(jbeda) should this ever be false?
},
},
},
}
}
// TCPProxy creates a new TCPProxy filter.
func TCPProxy(statPrefix string, proxy *dag.TCPProxy, accessLogPath string) listener.Filter {
switch len(proxy.Services) {
case 1:
return listener.Filter{
Name: util.TCPProxy,
ConfigType: &listener.Filter_Config{
Config: &types.Struct{
Fields: map[string]*types.Value{
"stat_prefix": sv(statPrefix),
"cluster": sv(Clustername(proxy.Services[0])),
"access_log": accesslog(accessLogPath),
},
},
},
}
default:
// its easier to sort the input of the cluster list rather than the
// grpc type output. We have to make a copy to avoid mutating the dag.
services := make([]*dag.TCPService, len(proxy.Services))
copy(services, proxy.Services)
sort.Stable(tcpServiceByName(services))
var l []*types.Value
for _, service := range services {
weight := service.Weight
if weight == 0 {
weight = 1
}
l = append(l, st(map[string]*types.Value{
"name": sv(Clustername(service)),
"weight": nv(float64(weight)),
}))
}
return listener.Filter{
Name: util.TCPProxy,
ConfigType: &listener.Filter_Config{
Config: &types.Struct{
Fields: map[string]*types.Value{
"stat_prefix": sv(statPrefix),
"weighted_clusters": st(map[string]*types.Value{
"clusters": lv(l...),
}),
"access_log": accesslog(accessLogPath),
},
},
},
}
}
}
type tcpServiceByName []*dag.TCPService
func (t tcpServiceByName) Len() int { return len(t) }
func (t tcpServiceByName) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
func (t tcpServiceByName) Less(i, j int) bool {
if t[i].Name == t[j].Name {
return t[i].Weight < t[j].Weight
}
return t[i].Name < t[j].Name
}
// SocketAddress creates a new TCP core.Address.
func SocketAddress(address string, port int) *core.Address {
return &core.Address{
Address: &core.Address_SocketAddress{
SocketAddress: &core.SocketAddress{
Protocol: core.TCP,
Address: address,
PortSpecifier: &core.SocketAddress_PortValue{
PortValue: uint32(port),
},
},
},
}
}
// DownstreamTLSContext creates a new DownstreamTlsContext.
func DownstreamTLSContext(cert, key []byte, tlsMinProtoVersion auth.TlsParameters_TlsProtocol, alpnProtos ...string) *auth.DownstreamTlsContext {
return &auth.DownstreamTlsContext{
CommonTlsContext: &auth.CommonTlsContext{
TlsParams: &auth.TlsParameters{
TlsMinimumProtocolVersion: tlsMinProtoVersion,
TlsMaximumProtocolVersion: auth.TlsParameters_TLSv1_3,
},
TlsCertificates: []*auth.TlsCertificate{{
CertificateChain: &core.DataSource{
Specifier: &core.DataSource_InlineBytes{
InlineBytes: cert,
},
},
PrivateKey: &core.DataSource{
Specifier: &core.DataSource_InlineBytes{
InlineBytes: key,
},
},
}},
AlpnProtocols: alpnProtos,
},
}
}
func accesslog(path string) *types.Value {
return lv(
st(map[string]*types.Value{
"name": sv(util.FileAccessLog),
"config": st(map[string]*types.Value{
"path": sv(path),
}),
}),
)
}
func sv(s string) *types.Value {
return &types.Value{Kind: &types.Value_StringValue{StringValue: s}}
}
func st(m map[string]*types.Value) *types.Value {
return &types.Value{Kind: &types.Value_StructValue{StructValue: &types.Struct{Fields: m}}}
}
func lv(v ...*types.Value) *types.Value {
return &types.Value{Kind: &types.Value_ListValue{ListValue: &types.ListValue{Values: v}}}
}
func nv(n float64) *types.Value {
return &types.Value{Kind: &types.Value_NumberValue{NumberValue: n}}
}