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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 newrelic
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 is a generic span category.
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
TxnName string
Category spanCategory
Component string
Kind string
IsEntrypoint bool
TrustedParentID string
TracingVendors string
AgentAttributes spanAttributeMap
UserAttributes 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", timeToIntMillis(e.Timestamp))
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)
}
if "" != e.TrustedParentID {
w.stringField("trustedParentId", e.TrustedParentID)
}
if "" != e.TracingVendors {
w.stringField("tracingVendors", e.TracingVendors)
}
if "" != e.TxnName {
w.stringField("transaction.name", e.TxnName)
}
buf.WriteByte('}')
buf.WriteByte(',')
buf.WriteByte('{')
writeAttrs(buf, e.UserAttributes)
buf.WriteByte('}')
buf.WriteByte(',')
buf.WriteByte('{')
writeAttrs(buf, e.AgentAttributes)
buf.WriteByte('}')
buf.WriteByte(']')
}
func writeAttrs(buf *bytes.Buffer, attrs spanAttributeMap) {
w := jsonFieldsWriter{buf: buf}
for key, val := range attrs {
w.writerField(key, val)
}
}
// 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) addEventPopulated(e *spanEvent) {
events.analyticsEvents.addEvent(analyticsEvent{priority: e.Priority, jsonWriter: e})
}
// MergeSpanEvents 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) MergeSpanEvents(evts []*spanEvent) {
for _, evt := range evts {
events.addEventPopulated(evt)
}
}
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
}