mirror of
https://github.com/prometheus/prometheus.git
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73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"bytes"
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"fmt"
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"time"
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"github.com/golang/glog"
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)
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type traceStep struct {
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stepTime time.Time
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msg string
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}
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type Trace struct {
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name string
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startTime time.Time
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steps []traceStep
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}
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func NewTrace(name string) *Trace {
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return &Trace{name, time.Now(), nil}
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}
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func (t *Trace) Step(msg string) {
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if t.steps == nil {
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// traces almost always have less than 6 steps, do this to avoid more than a single allocation
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t.steps = make([]traceStep, 0, 6)
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}
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t.steps = append(t.steps, traceStep{time.Now(), msg})
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}
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func (t *Trace) Log() {
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endTime := time.Now()
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var buffer bytes.Buffer
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buffer.WriteString(fmt.Sprintf("Trace %q (started %v):\n", t.name, t.startTime))
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lastStepTime := t.startTime
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for _, step := range t.steps {
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buffer.WriteString(fmt.Sprintf("[%v] [%v] %v\n", step.stepTime.Sub(t.startTime), step.stepTime.Sub(lastStepTime), step.msg))
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lastStepTime = step.stepTime
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}
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buffer.WriteString(fmt.Sprintf("[%v] [%v] END\n", endTime.Sub(t.startTime), endTime.Sub(lastStepTime)))
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glog.Info(buffer.String())
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}
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func (t *Trace) LogIfLong(threshold time.Duration) {
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if time.Since(t.startTime) >= threshold {
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t.Log()
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}
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}
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func (t *Trace) TotalTime() time.Duration {
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return time.Since(t.startTime)
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}
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