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config.go
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config.go
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/*
*
* Copyright 2020 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 priority
import (
"encoding/json"
"fmt"
internalserviceconfig "github.com/arshanvit/grpc/internal/serviceconfig"
"github.com/arshanvit/grpc/serviceconfig"
)
// Child is a child of priority balancer.
type Child struct {
Config *internalserviceconfig.BalancerConfig `json:"config,omitempty"`
IgnoreReresolutionRequests bool `json:"ignoreReresolutionRequests,omitempty"`
}
// LBConfig represents priority balancer's config.
type LBConfig struct {
serviceconfig.LoadBalancingConfig `json:"-"`
// Children is a map from the child balancer names to their configs. Child
// names can be found in field Priorities.
Children map[string]*Child `json:"children,omitempty"`
// Priorities is a list of child balancer names. They are sorted from
// highest priority to low. The type/config for each child can be found in
// field Children, with the balancer name as the key.
Priorities []string `json:"priorities,omitempty"`
}
func parseConfig(c json.RawMessage) (*LBConfig, error) {
var cfg LBConfig
if err := json.Unmarshal(c, &cfg); err != nil {
return nil, err
}
prioritiesSet := make(map[string]bool)
for _, name := range cfg.Priorities {
if _, ok := cfg.Children[name]; !ok {
return nil, fmt.Errorf("LB policy name %q found in Priorities field (%v) is not found in Children field (%+v)", name, cfg.Priorities, cfg.Children)
}
prioritiesSet[name] = true
}
for name := range cfg.Children {
if _, ok := prioritiesSet[name]; !ok {
return nil, fmt.Errorf("LB policy name %q found in Children field (%v) is not found in Priorities field (%+v)", name, cfg.Children, cfg.Priorities)
}
}
return &cfg, nil
}