mirror of https://github.com/grpc/grpc-go.git
68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
/*
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*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package grpclb
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import (
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"encoding/json"
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"google.golang.org/grpc"
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"google.golang.org/grpc/balancer/roundrobin"
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"google.golang.org/grpc/serviceconfig"
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)
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const (
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roundRobinName = roundrobin.Name
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pickFirstName = grpc.PickFirstBalancerName
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)
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type grpclbServiceConfig struct {
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serviceconfig.LoadBalancingConfig
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ChildPolicy *[]map[string]json.RawMessage
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TargetName string
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}
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func (b *lbBuilder) ParseConfig(lbConfig json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
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ret := &grpclbServiceConfig{}
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if err := json.Unmarshal(lbConfig, ret); err != nil {
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return nil, err
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}
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return ret, nil
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}
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func childIsPickFirst(sc *grpclbServiceConfig) bool {
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if sc == nil {
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return false
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}
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childConfigs := sc.ChildPolicy
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if childConfigs == nil {
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return false
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}
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for _, childC := range *childConfigs {
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// If round_robin exists before pick_first, return false
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if _, ok := childC[roundRobinName]; ok {
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return false
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}
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// If pick_first is before round_robin, return true
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if _, ok := childC[pickFirstName]; ok {
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return true
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}
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}
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return false
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}
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