mirror of https://github.com/grpc/grpc-go.git
139 lines
3.7 KiB
Go
139 lines
3.7 KiB
Go
/*
|
|
*
|
|
* Copyright 2019 gRPC authors.
|
|
*
|
|
* 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 internal
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
|
|
"google.golang.org/grpc/balancer"
|
|
"google.golang.org/grpc/serviceconfig"
|
|
basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
|
|
)
|
|
|
|
// Locality is xds.Locality without XXX fields, so it can be used as map
|
|
// keys.
|
|
//
|
|
// xds.Locality cannot be map keys because one of the XXX fields is a slice.
|
|
//
|
|
// This struct should only be used as map keys. Use the proto message directly
|
|
// in all other places.
|
|
type Locality struct {
|
|
Region string
|
|
Zone string
|
|
SubZone string
|
|
}
|
|
|
|
func (lamk Locality) String() string {
|
|
return fmt.Sprintf("%s-%s-%s", lamk.Region, lamk.Zone, lamk.SubZone)
|
|
}
|
|
|
|
// ToProto convert Locality to the proto representation.
|
|
func (lamk Locality) ToProto() *basepb.Locality {
|
|
return &basepb.Locality{
|
|
Region: lamk.Region,
|
|
Zone: lamk.Zone,
|
|
SubZone: lamk.SubZone,
|
|
}
|
|
}
|
|
|
|
// LBConfig represents the loadBalancingConfig section of the service config
|
|
// for xDS balancers.
|
|
type LBConfig struct {
|
|
serviceconfig.LoadBalancingConfig
|
|
// BalancerName represents the load balancer to use.
|
|
BalancerName string
|
|
// ChildPolicy represents the load balancing config for the child policy.
|
|
ChildPolicy *LoadBalancingConfig
|
|
// FallBackPolicy represents the load balancing config for the fallback.
|
|
FallBackPolicy *LoadBalancingConfig
|
|
}
|
|
|
|
// UnmarshalJSON parses the JSON-encoded byte slice in data and stores it in l.
|
|
// When unmarshalling, we iterate through the childPolicy/fallbackPolicy lists
|
|
// and select the first LB policy which has been registered.
|
|
func (l *LBConfig) UnmarshalJSON(data []byte) error {
|
|
var val map[string]json.RawMessage
|
|
if err := json.Unmarshal(data, &val); err != nil {
|
|
return err
|
|
}
|
|
for k, v := range val {
|
|
switch k {
|
|
case "balancerName":
|
|
if err := json.Unmarshal(v, &l.BalancerName); err != nil {
|
|
return err
|
|
}
|
|
case "childPolicy":
|
|
var lbcfgs []*LoadBalancingConfig
|
|
if err := json.Unmarshal(v, &lbcfgs); err != nil {
|
|
return err
|
|
}
|
|
for _, lbcfg := range lbcfgs {
|
|
if balancer.Get(lbcfg.Name) != nil {
|
|
l.ChildPolicy = lbcfg
|
|
break
|
|
}
|
|
}
|
|
case "fallbackPolicy":
|
|
var lbcfgs []*LoadBalancingConfig
|
|
if err := json.Unmarshal(v, &lbcfgs); err != nil {
|
|
return err
|
|
}
|
|
for _, lbcfg := range lbcfgs {
|
|
if balancer.Get(lbcfg.Name) != nil {
|
|
l.FallBackPolicy = lbcfg
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON returns a JSON encoding of l.
|
|
func (l *LBConfig) MarshalJSON() ([]byte, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// LoadBalancingConfig represents a single load balancing config,
|
|
// stored in JSON format.
|
|
type LoadBalancingConfig struct {
|
|
Name string
|
|
Config json.RawMessage
|
|
}
|
|
|
|
// MarshalJSON returns a JSON encoding of l.
|
|
func (l *LoadBalancingConfig) MarshalJSON() ([]byte, error) {
|
|
m := make(map[string]json.RawMessage)
|
|
m[l.Name] = l.Config
|
|
return json.Marshal(m)
|
|
}
|
|
|
|
// UnmarshalJSON parses the JSON-encoded byte slice in data and stores it in l.
|
|
func (l *LoadBalancingConfig) UnmarshalJSON(data []byte) error {
|
|
var cfg map[string]json.RawMessage
|
|
if err := json.Unmarshal(data, &cfg); err != nil {
|
|
return err
|
|
}
|
|
for name, config := range cfg {
|
|
l.Name = name
|
|
l.Config = config
|
|
}
|
|
return nil
|
|
}
|