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grpclb_config.go
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/
grpclb_config.go
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/*
*
* 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
}