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traces.go
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traces.go
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package model
import (
"encoding/json"
"fmt"
"sort"
"strings"
"go.opentelemetry.io/otel/trace"
)
type Trace struct {
ID trace.TraceID
RootSpan Span
Flat map[trace.SpanID]*Span `json:"-"`
}
func NewTrace(traceID string, spans []Span) Trace {
spanMap := make(map[string]*Span, 0)
for _, span := range spans {
spanCopy := span.setMetadataAttributes()
spanID := span.ID.String()
spanMap[spanID] = &spanCopy
}
rootSpans := make([]*Span, 0)
for _, span := range spanMap {
parentID := span.Attributes[TracetestMetadataFieldParentID]
parentSpan, found := spanMap[parentID]
if !found {
rootSpans = append(rootSpans, span)
continue
}
parentSpan.Children = append(parentSpan.Children, span)
span.Parent = parentSpan
}
rootSpan := getRootSpan(rootSpans)
id, _ := trace.TraceIDFromHex(traceID)
trace := Trace{
ID: id,
RootSpan: *rootSpan,
}
trace = trace.Sort()
return trace
}
func getRootSpan(allRoots []*Span) *Span {
if len(allRoots) == 1 {
return allRoots[0]
}
var root *Span
for _, span := range allRoots {
if span.Name == TriggerSpanName || span.Name == TemporaryRootSpanName {
// This span should be promoted because it's either a temporary root or the definitive root
if root != nil && root.Name == TriggerSpanName {
// We cannot override the root because we already have the definitive root, otherwise,
// we will replace the definitive root with the temporary root.
continue
}
root = span
}
}
if root == nil {
root = &Span{ID: IDGen.SpanID(), Name: TemporaryRootSpanName, Attributes: make(Attributes), Children: []*Span{}}
}
for _, span := range allRoots {
if root != span {
root.Children = append(root.Children, span)
span.Parent = root
}
}
return root
}
func spanType(attrs Attributes) string {
// based on https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/trace/semantic_conventions
// using the first required attribute for each type
for key := range attrs {
switch true {
case strings.HasPrefix(key, "http."):
return "http"
case strings.HasPrefix(key, "db."):
return "database"
case strings.HasPrefix(key, "rpc."):
return "rpc"
case strings.HasPrefix(key, "messaging."):
return "messaging"
case strings.HasPrefix(key, "faas."):
return "faas"
case strings.HasPrefix(key, "exception."):
return "exception"
}
}
return "general"
}
func spanDuration(span Span) string {
timeDifference := span.EndTime.Sub(span.StartTime)
return fmt.Sprintf("%d", int64(timeDifference))
}
func (t *Trace) Sort() Trace {
sortedRoot := sortSpanChildren(t.RootSpan)
trace := Trace{
ID: t.ID,
RootSpan: sortedRoot,
Flat: make(map[trace.SpanID]*Span, 0),
}
flattenSpans(trace.Flat, sortedRoot)
return trace
}
const TriggerSpanName = "Tracetest trigger"
const TemporaryRootSpanName = "Temporary Tracetest root span"
func (t *Trace) HasRootSpan() bool {
return t.RootSpan.Name == TriggerSpanName
}
func (t *Trace) InsertRootSpan(newRoot Span) *Trace {
if !t.RootSpan.IsZero() {
newRoot = replaceRoot(t.RootSpan, newRoot)
}
trace := Trace{
ID: t.ID,
RootSpan: newRoot,
}
sorted := trace.Sort()
return &sorted
}
func replaceRoot(oldRoot, newRoot Span) Span {
if oldRoot.Name == TemporaryRootSpanName {
// Replace the temporary root with the actual root
newRoot.Children = oldRoot.Children
for _, span := range oldRoot.Children {
span.Parent = &newRoot
}
return newRoot
}
if oldRoot.Attributes == nil {
oldRoot.Attributes = make(Attributes)
}
oldRoot.Parent = &newRoot
oldRoot.Attributes[TracetestMetadataFieldParentID] = newRoot.ID.String()
newRoot.Children = append(newRoot.Children, &oldRoot)
return newRoot
}
func (t *Trace) Spans() []Span {
if t == nil {
return []Span{}
}
spans := make([]Span, 0, len(t.Flat))
for _, span := range t.Flat {
spans = append(spans, *span)
}
return spans
}
func sortSpanChildren(span Span) Span {
sort.SliceStable(span.Children, func(i, j int) bool {
return span.Children[i].StartTime.Before(span.Children[j].StartTime)
})
children := make([]*Span, 0, len(span.Children))
for _, childSpan := range span.Children {
newChild := sortSpanChildren(*childSpan)
children = append(children, &newChild)
}
span.Children = children
return span
}
func (t *Trace) UnmarshalJSON(data []byte) error {
type Alias Trace
aux := &struct {
ID string
*Alias
}{
Alias: (*Alias)(t),
}
if err := json.Unmarshal(data, &aux); err != nil {
return fmt.Errorf("unmarshal trace: %w", err)
}
tid, err := trace.TraceIDFromHex(aux.ID)
if err != nil {
return fmt.Errorf("unmarshal trace: %w", err)
}
t.ID = tid
t.Flat = map[trace.SpanID]*Span{}
flattenSpans(t.Flat, t.RootSpan)
return nil
}
func (t Trace) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
ID string
RootSpan Span
}{
ID: t.ID.String(),
RootSpan: t.RootSpan,
})
}
func flattenSpans(res map[trace.SpanID]*Span, root Span) {
rootPtr := &root
res[root.ID] = rootPtr
for _, child := range root.Children {
flattenSpans(res, *child)
}
// Remove children and parent because they are now part of the flatten structure
rootPtr.Children = nil
}