forked from open-telemetry/opentelemetry-collector-contrib
/
composite_helper.go
66 lines (59 loc) · 2.46 KB
/
composite_helper.go
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// Copyright The OpenTelemetry 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 tailsamplingprocessor // import "github.com/asserts/opentelemetry-collector-contrib/processor/tailsamplingprocessor"
import (
"go.uber.org/zap"
"github.com/asserts/opentelemetry-collector-contrib/processor/tailsamplingprocessor/internal/sampling"
)
func getNewCompositePolicy(logger *zap.Logger, config *CompositeCfg) (sampling.PolicyEvaluator, error) {
var subPolicyEvalParams []sampling.SubPolicyEvalParams
rateAllocationsMap := getRateAllocationMap(config)
for i := range config.SubPolicyCfg {
policyCfg := &config.SubPolicyCfg[i]
policy, err := getCompositeSubPolicyEvaluator(logger, policyCfg)
if err != nil {
return nil, err
}
evalParams := sampling.SubPolicyEvalParams{
Evaluator: policy,
MaxSpansPerSecond: int64(rateAllocationsMap[policyCfg.Name]),
}
subPolicyEvalParams = append(subPolicyEvalParams, evalParams)
}
return sampling.NewComposite(logger, config.MaxTotalSpansPerSecond, subPolicyEvalParams, sampling.MonotonicClock{}), nil
}
// Apply rate allocations to the sub-policies
func getRateAllocationMap(config *CompositeCfg) map[string]float64 {
rateAllocationsMap := make(map[string]float64)
maxTotalSPS := float64(config.MaxTotalSpansPerSecond)
// Default SPS determined by equally diving number of sub policies
defaultSPS := maxTotalSPS / float64(len(config.SubPolicyCfg))
for _, rAlloc := range config.RateAllocation {
if rAlloc.Percent > 0 {
rateAllocationsMap[rAlloc.Policy] = (float64(rAlloc.Percent) / 100) * maxTotalSPS
} else {
rateAllocationsMap[rAlloc.Policy] = defaultSPS
}
}
return rateAllocationsMap
}
// Return instance of composite sub-policy
func getCompositeSubPolicyEvaluator(logger *zap.Logger, cfg *CompositeSubPolicyCfg) (sampling.PolicyEvaluator, error) {
switch cfg.Type {
case And:
return getNewAndPolicy(logger, &cfg.AndCfg)
default:
return getSharedPolicyEvaluator(logger, &cfg.sharedPolicyCfg)
}
}