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trace.go
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trace.go
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// Copyright 2017 Istio 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 model
import (
"strconv"
"istio.io/istio/pkg/features/pilot"
)
// Default trace sampling, if not provided in env var.
const traceSamplingDefault = 100.0
var (
traceSampling = getTraceSampling()
)
// Return trace sampling if set correctly, or default if not.
func getTraceSampling() float64 {
if pilot.TraceSampling == "" {
return traceSamplingDefault
}
f, err := strconv.ParseFloat(pilot.TraceSampling, 64)
if err != nil {
log.Warnf("PILOT_TRACE_SAMPLING not set to a number: %v", pilot.TraceSampling)
return traceSamplingDefault
}
if f < 0.0 || f > 100.0 {
log.Warnf("PILOT_TRACE_SAMPLING out of range: %v", f)
return traceSamplingDefault
}
return f
}
// TraceConfig values are percentages 0.0 - 100.0
type TraceConfig struct {
ClientSampling float64
RandomSampling float64
OverallSampling float64
}
// GetTraceConfig returns configured TraceConfig
func GetTraceConfig() TraceConfig {
return TraceConfig{
ClientSampling: 100.0,
RandomSampling: traceSampling,
OverallSampling: 100.0,
}
}