Skip to content
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
Cannot retrieve contributors at this time
package main
import (
cluster ""
core ""
endpoint ""
_struct ""
// EnvoyService is the resource type that is discovered by EDS
type EnvoyService struct {
name string
port uint32
endpoints []EnvoyServiceEndpoint
// EnvoyServiceEndpoint is 1 single server & its metadata
type EnvoyServiceEndpoint struct {
Address string
Metadata map[string]string
// MakeEndpointsForService converts from our convenience format to a ClusterLoadAssignment
func MakeEndpointsForService(service *EnvoyService) *endpoint.ClusterLoadAssignment {
cla := &endpoint.ClusterLoadAssignment{
Endpoints: []*endpoint.LocalityLbEndpoints{},
for _, serviceEndpoint := range service.endpoints {
cla.Endpoints = append(cla.Endpoints,
LbEndpoints: []*endpoint.LbEndpoint{{
// Point to a specified IP address
HostIdentifier: &endpoint.LbEndpoint_Endpoint{
Endpoint: &endpoint.Endpoint{
Address: &core.Address{
Address: &core.Address_SocketAddress{
SocketAddress: &core.SocketAddress{
Protocol: core.SocketAddress_TCP,
Address: serviceEndpoint.Address,
PortSpecifier: &core.SocketAddress_PortValue{
PortValue: service.port,
// Allow filtering via metadata
Metadata: &core.Metadata{
FilterMetadata: map[string]*_struct.Struct{
"": mapToStruct(serviceEndpoint.Metadata),
return cla
// MakeClusterForService returns an EDS cluster, filled in via endpoint resources
func MakeClusterForService(service *EnvoyService) *cluster.Cluster {
return &cluster.Cluster{
ConnectTimeout: ptypes.DurationProto(5 * time.Second),
ClusterDiscoveryType: &cluster.Cluster_Type{Type: cluster.Cluster_EDS},
LbPolicy: cluster.Cluster_ROUND_ROBIN,
EdsClusterConfig: &cluster.Cluster_EdsClusterConfig{
EdsConfig: makeConfigSource(),
// LbSubsetConfig is how we can route traffic to specific backends
// see
LbSubsetConfig: &cluster.Cluster_LbSubsetConfig{
FallbackPolicy: cluster.Cluster_LbSubsetConfig_ANY_ENDPOINT,
DefaultSubset: mapToStruct(map[string]string{"slice": "default"}),
SubsetSelectors: []*cluster.Cluster_LbSubsetConfig_LbSubsetSelector{
{Keys: []string{"slice"}, FallbackPolicy: cluster.Cluster_LbSubsetConfig_LbSubsetSelector_NO_FALLBACK},
// Convert to annoying protobuf nested types...
func mapToStruct(m map[string]string) *_struct.Struct {
fields := make(map[string]*_struct.Value, len(m))
for key, value := range m {
fields[key] = &_struct.Value{Kind: &_struct.Value_StringValue{StringValue: value}}
return &_struct.Struct{Fields: fields}