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span_events.go
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span_events.go
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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"bytes"
"time"
)
// https://source.datanerd.us/agents/agent-specs/blob/master/Span-Events.md
type spanCategory string
const (
spanCategoryHTTP spanCategory = "http"
spanCategoryDatastore = "datastore"
spanCategoryGeneric = "generic"
)
// SpanEvent represents a span event, necessary to support Distributed Tracing.
type SpanEvent struct {
TraceID string
GUID string
ParentID string
TransactionID string
Sampled bool
Priority Priority
Timestamp time.Time
Duration time.Duration
Name string
Category spanCategory
Component string
Kind string
IsEntrypoint bool
Attributes spanAttributeMap
}
// WriteJSON prepares JSON in the format expected by the collector.
func (e *SpanEvent) WriteJSON(buf *bytes.Buffer) {
w := jsonFieldsWriter{buf: buf}
buf.WriteByte('[')
buf.WriteByte('{')
w.stringField("type", "Span")
w.stringField("traceId", e.TraceID)
w.stringField("guid", e.GUID)
if "" != e.ParentID {
w.stringField("parentId", e.ParentID)
}
w.stringField("transactionId", e.TransactionID)
w.boolField("sampled", e.Sampled)
w.writerField("priority", e.Priority)
w.intField("timestamp", e.Timestamp.UnixNano()/(1000*1000)) // in milliseconds
w.floatField("duration", e.Duration.Seconds())
w.stringField("name", e.Name)
w.stringField("category", string(e.Category))
if e.IsEntrypoint {
w.boolField("nr.entryPoint", true)
}
if e.Component != "" {
w.stringField("component", e.Component)
}
if e.Kind != "" {
w.stringField("span.kind", e.Kind)
}
buf.WriteByte('}')
buf.WriteByte(',')
buf.WriteByte('{')
// user attributes section is unused
buf.WriteByte('}')
buf.WriteByte(',')
buf.WriteByte('{')
w = jsonFieldsWriter{buf: buf}
for key, val := range e.Attributes {
w.writerField(key.String(), val)
}
buf.WriteByte('}')
buf.WriteByte(']')
}
// MarshalJSON is used for testing.
func (e *SpanEvent) MarshalJSON() ([]byte, error) {
buf := bytes.NewBuffer(make([]byte, 0, 256))
e.WriteJSON(buf)
return buf.Bytes(), nil
}
type spanEvents struct {
*analyticsEvents
}
func newSpanEvents(max int) *spanEvents {
return &spanEvents{
analyticsEvents: newAnalyticsEvents(max),
}
}
func (events *spanEvents) addEvent(e *SpanEvent, cat *BetterCAT) {
e.TraceID = cat.TraceID()
e.TransactionID = cat.ID
e.Sampled = cat.Sampled
e.Priority = cat.Priority
events.addEventPopulated(e)
}
func (events *spanEvents) addEventPopulated(e *SpanEvent) {
events.analyticsEvents.addEvent(analyticsEvent{priority: e.Priority, jsonWriter: e})
}
// MergeFromTransaction merges the span events from a transaction into the
// harvest's span events. This should only be called if the transaction was
// sampled and span events are enabled.
func (events *spanEvents) MergeFromTransaction(txndata *TxnData) {
root := &SpanEvent{
GUID: txndata.getRootSpanID(),
Timestamp: txndata.Start,
Duration: txndata.Duration,
Name: txndata.FinalName,
Category: spanCategoryGeneric,
IsEntrypoint: true,
}
if nil != txndata.BetterCAT.Inbound {
root.ParentID = txndata.BetterCAT.Inbound.ID
}
events.addEvent(root, &txndata.BetterCAT)
for _, evt := range txndata.spanEvents {
events.addEvent(evt, &txndata.BetterCAT)
}
}
func (events *spanEvents) MergeIntoHarvest(h *Harvest) {
h.SpanEvents.mergeFailed(events.analyticsEvents)
}
func (events *spanEvents) Data(agentRunID string, harvestStart time.Time) ([]byte, error) {
return events.CollectorJSON(agentRunID)
}
func (events *spanEvents) EndpointMethod() string {
return cmdSpanEvents
}