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compact_duration.go
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compact_duration.go
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// Copyright 2023 The Kelemetry 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 tfstep
import (
"time"
"github.com/jaegertracing/jaeger/model"
tfconfig "github.com/kubewharf/kelemetry/pkg/frontend/tf/config"
tftree "github.com/kubewharf/kelemetry/pkg/frontend/tf/tree"
"github.com/kubewharf/kelemetry/pkg/manager"
"github.com/kubewharf/kelemetry/pkg/util/zconstants"
)
func init() {
manager.Global.ProvideListImpl(
"tf-step/compact-duration-visitor",
manager.Ptr(&tfconfig.VisitorStep[CompactDurationVisitor]{}),
&manager.List[tfconfig.RegisteredStep]{},
)
}
// Reduce pseudospan duration into a "flame" shape.
type CompactDurationVisitor struct{}
func (CompactDurationVisitor) Kind() string { return "CompactDurationVisitor" }
func (visitor CompactDurationVisitor) Enter(tree *tftree.SpanTree, span *model.Span) tftree.TreeVisitor {
return visitor
}
func (visitor CompactDurationVisitor) Exit(tree *tftree.SpanTree, span *model.Span) {
// use exit hook to use compact results of children
if _, isPseudo := model.KeyValues(span.Tags).FindByKey(zconstants.PseudoType); !isPseudo {
return
}
var r timeRange
for childId := range tree.Children(span.SpanID) {
child := tree.Span(childId)
childStart := child.StartTime
childEnd := childStart.Add(child.Duration)
r.union(childStart, childEnd)
}
for _, log := range span.Logs {
r.union(log.Timestamp, log.Timestamp.Add(zconstants.DummyDuration))
}
if r.hasStart && r.hasEnd {
span.StartTime = r.start
span.Duration = r.end.Sub(r.start)
if tree.Root == span {
// add 5% padding for the root span for better visualization
padding := span.Duration / 20
span.StartTime = span.StartTime.Add(-padding)
span.Duration += padding * 2
}
}
}
type timeRange struct {
start, end time.Time
hasStart, hasEnd bool
}
func (r *timeRange) union(start time.Time, end time.Time) {
if !r.hasStart || r.start.After(start) {
r.hasStart = true
r.start = start
}
if !r.hasEnd || r.end.Before(end) {
r.hasEnd = true
r.end = end
}
}