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trace.go
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trace.go
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/*
Copyright 2015 The Kubernetes 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 trace
import (
"bytes"
"fmt"
"math/rand"
"time"
"github.com/golang/glog"
)
type traceStep struct {
stepTime time.Time
msg string
}
type Trace struct {
name string
startTime time.Time
steps []traceStep
}
func New(name string) *Trace {
return &Trace{name, time.Now(), nil}
}
func (t *Trace) Step(msg string) {
if t.steps == nil {
// traces almost always have less than 6 steps, do this to avoid more than a single allocation
t.steps = make([]traceStep, 0, 6)
}
t.steps = append(t.steps, traceStep{time.Now(), msg})
}
func (t *Trace) Log() {
// an explicit logging request should dump all the steps out at the higher level
t.logWithStepThreshold(0)
}
func (t *Trace) logWithStepThreshold(stepThreshold time.Duration) {
var buffer bytes.Buffer
tracenum := rand.Int31()
endTime := time.Now()
totalTime := endTime.Sub(t.startTime)
buffer.WriteString(fmt.Sprintf("Trace[%d]: %q (started: %v) (total time: %v):\n", tracenum, t.name, t.startTime, totalTime))
lastStepTime := t.startTime
for _, step := range t.steps {
stepDuration := step.stepTime.Sub(lastStepTime)
if stepThreshold == 0 || stepDuration > stepThreshold || glog.V(4) {
buffer.WriteString(fmt.Sprintf("Trace[%d]: [%v] [%v] %v\n", tracenum, step.stepTime.Sub(t.startTime), stepDuration, step.msg))
}
lastStepTime = step.stepTime
}
stepDuration := endTime.Sub(lastStepTime)
if stepThreshold == 0 || stepDuration > stepThreshold || glog.V(4) {
buffer.WriteString(fmt.Sprintf("Trace[%d]: [%v] [%v] END\n", tracenum, endTime.Sub(t.startTime), stepDuration))
}
glog.Info(buffer.String())
}
func (t *Trace) LogIfLong(threshold time.Duration) {
if time.Since(t.startTime) >= threshold {
// if any step took more than it's share of the total allowed time, it deserves a higher log level
stepThreshold := threshold / time.Duration(len(t.steps)+1)
t.logWithStepThreshold(stepThreshold)
}
}
func (t *Trace) TotalTime() time.Duration {
return time.Since(t.startTime)
}