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spanstat.go
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spanstat.go
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// Copyright 2018 Authors of Cilium
//
// 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 spanstat
import (
"time"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/cilium/cilium/pkg/safetime"
)
var (
subSystem = "spanstat"
log = logging.DefaultLogger.WithField(logfields.LogSubsys, subSystem)
)
// SpanStat measures the total duration of all time spent in between Start()
// and Stop() calls.
type SpanStat struct {
spanStart time.Time
successDuration time.Duration
failureDuration time.Duration
}
// Start creates a new SpanStat and starts it
func Start() *SpanStat {
s := &SpanStat{}
return s.Start()
}
// Start starts a new span
func (s *SpanStat) Start() *SpanStat {
s.spanStart = time.Now()
return s
}
// EndError calls End() based on the value of err
func (s *SpanStat) EndError(err error) *SpanStat {
return s.End(err == nil)
}
// End ends the current span and adds the measured duration to the total
// cumulated duration, and to the success or failure cumulated duration
// depending on the given success flag
func (s *SpanStat) End(success bool) *SpanStat {
if !s.spanStart.IsZero() {
d, _ := safetime.TimeSinceSafe(s.spanStart, log)
if success {
s.successDuration += d
} else {
s.failureDuration += d
}
}
s.spanStart = time.Time{}
return s
}
// Total returns the total duration of all spans measured, including both
// successes and failures
func (s *SpanStat) Total() time.Duration {
return s.successDuration + s.failureDuration
}
// SuccessTotal returns the total duration of all successful spans measured
func (s *SpanStat) SuccessTotal() time.Duration {
return s.successDuration
}
// FailureTotal returns the total duration of all successful spans measured
func (s *SpanStat) FailureTotal() time.Duration {
return s.failureDuration
}
// Reset rests the duration measurements
func (s *SpanStat) Reset() {
s.successDuration = 0
s.failureDuration = 0
}