mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
66 lines
1.6 KiB
Go
66 lines
1.6 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 grpclb
|
|
|
|
import (
|
|
"encoding/json"
|
|
|
|
"google.golang.org/grpc"
|
|
"google.golang.org/grpc/balancer/roundrobin"
|
|
"google.golang.org/grpc/serviceconfig"
|
|
)
|
|
|
|
const (
|
|
roundRobinName = roundrobin.Name
|
|
pickFirstName = grpc.PickFirstBalancerName
|
|
)
|
|
|
|
type grpclbServiceConfig struct {
|
|
serviceconfig.LoadBalancingConfig
|
|
ChildPolicy *[]map[string]json.RawMessage
|
|
}
|
|
|
|
func (b *lbBuilder) ParseConfig(lbConfig json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
|
|
ret := &grpclbServiceConfig{}
|
|
if err := json.Unmarshal(lbConfig, ret); err != nil {
|
|
return nil, err
|
|
}
|
|
return ret, nil
|
|
}
|
|
|
|
func childIsPickFirst(sc *grpclbServiceConfig) bool {
|
|
if sc == nil {
|
|
return false
|
|
}
|
|
childConfigs := sc.ChildPolicy
|
|
if childConfigs == nil {
|
|
return false
|
|
}
|
|
for _, childC := range *childConfigs {
|
|
// If round_robin exists before pick_first, return false
|
|
if _, ok := childC[roundRobinName]; ok {
|
|
return false
|
|
}
|
|
// If pick_first is before round_robin, return true
|
|
if _, ok := childC[pickFirstName]; ok {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|