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config.go
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config.go
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/*
*
* Copyright 2021 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 ringhash
import (
"encoding/json"
"fmt"
"google.golang.org/grpc/serviceconfig"
)
// LBConfig is the balancer config for ring_hash balancer.
type LBConfig struct {
serviceconfig.LoadBalancingConfig `json:"-"`
MinRingSize uint64 `json:"minRingSize,omitempty"`
MaxRingSize uint64 `json:"maxRingSize,omitempty"`
}
const (
defaultMinSize = 1024
defaultMaxSize = 4096
// TODO(apolcyn): make makeRingSizeCap configurable, with either a dial option or global setting
maxRingSizeCap = 4096
)
func parseConfig(c json.RawMessage) (*LBConfig, error) {
var cfg LBConfig
if err := json.Unmarshal(c, &cfg); err != nil {
return nil, err
}
if cfg.MinRingSize == 0 {
cfg.MinRingSize = defaultMinSize
}
if cfg.MaxRingSize == 0 {
cfg.MaxRingSize = defaultMaxSize
}
if cfg.MinRingSize > maxRingSizeCap {
cfg.MinRingSize = maxRingSizeCap
}
if cfg.MaxRingSize > maxRingSizeCap {
cfg.MaxRingSize = maxRingSizeCap
}
if cfg.MinRingSize > cfg.MaxRingSize {
return nil, fmt.Errorf("min %v is greater than max %v", cfg.MinRingSize, cfg.MaxRingSize)
}
return &cfg, nil
}