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updater.go
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updater.go
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// Copyright (c) 2020 The Houyi 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 houyi
import (
"fmt"
"github.com/houyi-tracing/houyi/idl/api_v1"
"go.uber.org/zap"
)
type SamplerUpdater interface {
Update(sampler *RemoteSampler, strategies *api_v1.StrategiesResponse) error
}
type samplerUpdater struct {
logger *zap.Logger
}
func NewSamplerUpdater(logger *zap.Logger) SamplerUpdater {
return &samplerUpdater{logger}
}
func (s *samplerUpdater) Update(sampler *RemoteSampler, resp *api_v1.StrategiesResponse) error {
for _, strategy := range resp.GetStrategies() {
var newSampler Sampler
switch strategy.GetType() {
case api_v1.Type_CONST:
newSampler = NewConstSampler(strategy.GetConst().GetAlwaysSample())
case api_v1.Type_PROBABILITY:
newSampler = NewProbabilitySampler(strategy.GetProbability().GetSamplingRate())
case api_v1.Type_RATE_LIMITING:
newSampler = NewRateLimitingSampler(float64(strategy.GetRateLimiting().GetMaxTracesPerSecond()))
case api_v1.Type_ADAPTIVE:
sr := strategy.GetAdaptive().GetSamplingRate()
s.logger.Info("Updated to adaptive sampler", zap.Float64("sampling rate", sr))
newSampler = NewAdaptiveSampler(strategy.GetAdaptive().GetSamplingRate())
case api_v1.Type_DYNAMIC:
sr := strategy.GetDynamic().GetSamplingRate()
s.logger.Info("Dynamic Sampler",
zap.String("service", strategy.Service),
zap.String("operation", strategy.Operation),
zap.Float64("sampling rate", sr))
newSampler = NewDynamicSampler(sr)
default:
return fmt.Errorf("invalid sampler type")
}
sampler.strategies[strategy.GetOperation()] = &PerOperationSampler{
strategy.GetOperation(),
newSampler,
}
}
return nil
}