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tracing.go
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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"bytes"
"errors"
"fmt"
"net/http"
"net/url"
"time"
"github.com/newrelic/go-agent/internal/cat"
"github.com/newrelic/go-agent/internal/jsonx"
"github.com/newrelic/go-agent/internal/logger"
"github.com/newrelic/go-agent/internal/sysinfo"
)
// MarshalJSON limits the number of decimals.
func (p *Priority) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(priorityFormat, *p)), nil
}
// WriteJSON limits the number of decimals.
func (p Priority) WriteJSON(buf *bytes.Buffer) {
fmt.Fprintf(buf, priorityFormat, p)
}
// TxnEvent represents a transaction.
// https://source.datanerd.us/agents/agent-specs/blob/master/Transaction-Events-PORTED.md
// https://newrelic.atlassian.net/wiki/display/eng/Agent+Support+for+Synthetics%3A+Forced+Transaction+Traces+and+Analytic+Events
type TxnEvent struct {
FinalName string
Start time.Time
Duration time.Duration
TotalTime time.Duration
Queuing time.Duration
Zone ApdexZone
Attrs *Attributes
DatastoreExternalTotals
CrossProcess TxnCrossProcess
BetterCAT BetterCAT
HasError bool
}
// BetterCAT stores the transaction's priority and all fields related
// to a DistributedTracer's Cross-Application Trace.
type BetterCAT struct {
Enabled bool
Priority Priority
Sampled bool
Inbound *Payload
ID string
}
// TraceID returns the trace id.
func (e BetterCAT) TraceID() string {
if nil != e.Inbound {
return e.Inbound.TracedID
}
return e.ID
}
// TxnData contains the recorded data of a transaction.
type TxnData struct {
TxnEvent
IsWeb bool
Name string // Work in progress name.
Errors TxnErrors // Lazily initialized.
Stop time.Time
ApdexThreshold time.Duration
stamp segmentStamp
threadIDCounter uint64
TraceIDGenerator *TraceIDGenerator
LazilyCalculateSampled func() bool
SpanEventsEnabled bool
rootSpanID string
spanEvents []*SpanEvent
customSegments map[string]*metricData
datastoreSegments map[DatastoreMetricKey]*metricData
externalSegments map[externalMetricKey]*metricData
messageSegments map[MessageMetricKey]*metricData
TxnTrace
SlowQueriesEnabled bool
SlowQueryThreshold time.Duration
SlowQueries *slowQueries
// These better CAT supportability fields are left outside of
// TxnEvent.BetterCAT to minimize the size of transaction event memory.
DistributedTracingSupport
}
func (t *TxnData) saveTraceSegment(end segmentEnd, name string, attrs spanAttributeMap, externalGUID string) {
attrs = t.Attrs.filterSpanAttributes(attrs, destSegment)
t.TxnTrace.witnessNode(end, name, attrs, externalGUID)
}
// Thread contains a segment stack that is used to track segment parenting time
// within a single goroutine.
type Thread struct {
threadID uint64
stack []segmentFrame
// start and end are used to track the TotalTime this Thread was active.
start time.Time
end time.Time
}
// RecordActivity indicates that activity happened at this time on this
// goroutine which helps track total time.
func (thread *Thread) RecordActivity(now time.Time) {
if thread.start.IsZero() || now.Before(thread.start) {
thread.start = now
}
if now.After(thread.end) {
thread.end = now
}
}
// TotalTime returns the amount to time that this thread contributes to the
// total time.
func (thread *Thread) TotalTime() time.Duration {
if thread.start.Before(thread.end) {
return thread.end.Sub(thread.start)
}
return 0
}
// NewThread returns a new Thread to track segments in a new goroutine.
func NewThread(txndata *TxnData) *Thread {
// Each thread needs a unique ID.
txndata.threadIDCounter++
return &Thread{
threadID: txndata.threadIDCounter,
}
}
type segmentStamp uint64
type segmentTime struct {
Stamp segmentStamp
Time time.Time
}
// SegmentStartTime is embedded into the top level segments (rather than
// segmentTime) to minimize the structure sizes to minimize allocations.
type SegmentStartTime struct {
Stamp segmentStamp
Depth int
}
type stringJSONWriter string
func (s stringJSONWriter) WriteJSON(buf *bytes.Buffer) {
jsonx.AppendString(buf, string(s))
}
// spanAttributeMap is used for span attributes and segment attributes. The
// value is a jsonWriter to allow for segment query parameters.
type spanAttributeMap map[SpanAttribute]jsonWriter
func (m *spanAttributeMap) addString(key SpanAttribute, val string) {
if "" != val {
m.add(key, stringJSONWriter(val))
}
}
func (m *spanAttributeMap) add(key SpanAttribute, val jsonWriter) {
if *m == nil {
*m = make(spanAttributeMap)
}
(*m)[key] = val
}
func (m spanAttributeMap) copy() spanAttributeMap {
if len(m) == 0 {
return nil
}
cpy := make(spanAttributeMap, len(m))
for k, v := range m {
cpy[k] = v
}
return cpy
}
type segmentFrame struct {
segmentTime
children time.Duration
spanID string
attributes spanAttributeMap
}
type segmentEnd struct {
start segmentTime
stop segmentTime
duration time.Duration
exclusive time.Duration
SpanID string
ParentID string
threadID uint64
attributes spanAttributeMap
}
func (end segmentEnd) spanEvent() *SpanEvent {
if "" == end.SpanID {
return nil
}
return &SpanEvent{
GUID: end.SpanID,
ParentID: end.ParentID,
Timestamp: end.start.Time,
Duration: end.duration,
Attributes: end.attributes,
IsEntrypoint: false,
}
}
const (
datastoreProductUnknown = "Unknown"
datastoreOperationUnknown = "other"
)
// HasErrors indicates whether the transaction had errors.
func (t *TxnData) HasErrors() bool {
return len(t.Errors) > 0
}
func (t *TxnData) time(now time.Time) segmentTime {
// Update the stamp before using it so that a 0 stamp can be special.
t.stamp++
return segmentTime{
Time: now,
Stamp: t.stamp,
}
}
// AddAgentSpanAttribute allows attributes to be added to spans.
func (thread *Thread) AddAgentSpanAttribute(key SpanAttribute, val string) {
if len(thread.stack) > 0 {
thread.stack[len(thread.stack)-1].attributes.addString(key, val)
}
}
// StartSegment begins a segment.
func StartSegment(t *TxnData, thread *Thread, now time.Time) SegmentStartTime {
tm := t.time(now)
thread.stack = append(thread.stack, segmentFrame{
segmentTime: tm,
children: 0,
})
return SegmentStartTime{
Stamp: tm.Stamp,
Depth: len(thread.stack) - 1,
}
}
func (t *TxnData) getRootSpanID() string {
if "" == t.rootSpanID {
t.rootSpanID = t.TraceIDGenerator.GenerateTraceID()
}
return t.rootSpanID
}
// CurrentSpanIdentifier returns the identifier of the span at the top of the
// segment stack.
func (t *TxnData) CurrentSpanIdentifier(thread *Thread) string {
if 0 == len(thread.stack) {
return t.getRootSpanID()
}
if "" == thread.stack[len(thread.stack)-1].spanID {
thread.stack[len(thread.stack)-1].spanID = t.TraceIDGenerator.GenerateTraceID()
}
return thread.stack[len(thread.stack)-1].spanID
}
func (t *TxnData) saveSpanEvent(e *SpanEvent) {
e.Attributes = t.Attrs.filterSpanAttributes(e.Attributes, destSpan)
if len(t.spanEvents) < MaxSpanEvents {
t.spanEvents = append(t.spanEvents, e)
}
}
var (
errMalformedSegment = errors.New("segment identifier malformed: perhaps unsafe code has modified it?")
errSegmentOrder = errors.New(`improper segment use: the Transaction must be used ` +
`in a single goroutine and segments must be ended in "last started first ended" order: ` +
`see https://github.com/newrelic/go-agent/blob/master/GUIDE.md#segments`)
)
func endSegment(t *TxnData, thread *Thread, start SegmentStartTime, now time.Time) (segmentEnd, error) {
if 0 == start.Stamp {
return segmentEnd{}, errMalformedSegment
}
if start.Depth >= len(thread.stack) {
return segmentEnd{}, errSegmentOrder
}
if start.Depth < 0 {
return segmentEnd{}, errMalformedSegment
}
frame := thread.stack[start.Depth]
if start.Stamp != frame.Stamp {
return segmentEnd{}, errSegmentOrder
}
var children time.Duration
for i := start.Depth; i < len(thread.stack); i++ {
children += thread.stack[i].children
}
s := segmentEnd{
stop: t.time(now),
start: frame.segmentTime,
attributes: frame.attributes,
}
if s.stop.Time.After(s.start.Time) {
s.duration = s.stop.Time.Sub(s.start.Time)
}
if s.duration > children {
s.exclusive = s.duration - children
}
// Note that we expect (depth == (len(t.stack) - 1)). However, if
// (depth < (len(t.stack) - 1)), that's ok: could be a panic popped
// some stack frames (and the consumer was not using defer).
if start.Depth > 0 {
thread.stack[start.Depth-1].children += s.duration
}
thread.stack = thread.stack[0:start.Depth]
if t.SpanEventsEnabled && t.LazilyCalculateSampled() {
s.SpanID = frame.spanID
if "" == s.SpanID {
s.SpanID = t.TraceIDGenerator.GenerateTraceID()
}
// Note that the current span identifier is the parent's
// identifier because we've already popped the segment that's
// ending off of the stack.
s.ParentID = t.CurrentSpanIdentifier(thread)
}
s.threadID = thread.threadID
thread.RecordActivity(s.start.Time)
thread.RecordActivity(s.stop.Time)
return s, nil
}
// EndBasicSegment ends a basic segment.
func EndBasicSegment(t *TxnData, thread *Thread, start SegmentStartTime, now time.Time, name string) error {
end, err := endSegment(t, thread, start, now)
if nil != err {
return err
}
if nil == t.customSegments {
t.customSegments = make(map[string]*metricData)
}
m := metricDataFromDuration(end.duration, end.exclusive)
if data, ok := t.customSegments[name]; ok {
data.aggregate(m)
} else {
// Use `new` in place of &m so that m is not
// automatically moved to the heap.
cpy := new(metricData)
*cpy = m
t.customSegments[name] = cpy
}
if t.TxnTrace.considerNode(end) {
attributes := end.attributes.copy()
t.saveTraceSegment(end, customSegmentMetric(name), attributes, "")
}
if evt := end.spanEvent(); evt != nil {
evt.Name = customSegmentMetric(name)
evt.Category = spanCategoryGeneric
t.saveSpanEvent(evt)
}
return nil
}
// EndExternalParams contains the parameters for EndExternalSegment.
type EndExternalParams struct {
TxnData *TxnData
Thread *Thread
Start SegmentStartTime
Now time.Time
Logger logger.Logger
Response *http.Response
URL *url.URL
Host string
Library string
Method string
}
// EndExternalSegment ends an external segment.
func EndExternalSegment(p EndExternalParams) error {
t := p.TxnData
end, err := endSegment(t, p.Thread, p.Start, p.Now)
if nil != err {
return err
}
// Use the Host field if present, otherwise use host in the URL.
if p.Host == "" && p.URL != nil {
p.Host = p.URL.Host
}
if p.Host == "" {
p.Host = "unknown"
}
if p.Library == "" {
p.Library = "http"
}
var appData *cat.AppDataHeader
if p.Response != nil {
hdr := HTTPHeaderToAppData(p.Response.Header)
appData, err = t.CrossProcess.ParseAppData(hdr)
if err != nil {
if p.Logger.DebugEnabled() {
p.Logger.Debug("failure to parse cross application response header", map[string]interface{}{
"err": err.Error(),
"header": hdr,
})
}
}
}
var crossProcessID string
var transactionName string
var transactionGUID string
if appData != nil {
crossProcessID = appData.CrossProcessID
transactionName = appData.TransactionName
transactionGUID = appData.TransactionGUID
}
key := externalMetricKey{
Host: p.Host,
Library: p.Library,
Method: p.Method,
ExternalCrossProcessID: crossProcessID,
ExternalTransactionName: transactionName,
}
if nil == t.externalSegments {
t.externalSegments = make(map[externalMetricKey]*metricData)
}
t.externalCallCount++
t.externalDuration += end.duration
m := metricDataFromDuration(end.duration, end.exclusive)
if data, ok := t.externalSegments[key]; ok {
data.aggregate(m)
} else {
// Use `new` in place of &m so that m is not
// automatically moved to the heap.
cpy := new(metricData)
*cpy = m
t.externalSegments[key] = cpy
}
if t.TxnTrace.considerNode(end) {
attributes := end.attributes.copy()
if p.Library == "http" {
attributes.addString(spanAttributeHTTPURL, SafeURL(p.URL))
}
t.saveTraceSegment(end, key.scopedMetric(), attributes, transactionGUID)
}
if evt := end.spanEvent(); evt != nil {
evt.Name = key.scopedMetric()
evt.Category = spanCategoryHTTP
evt.Kind = "client"
evt.Component = p.Library
if p.Library == "http" {
evt.Attributes.addString(spanAttributeHTTPURL, SafeURL(p.URL))
evt.Attributes.addString(spanAttributeHTTPMethod, p.Method)
}
t.saveSpanEvent(evt)
}
return nil
}
// EndMessageParams contains the parameters for EndMessageSegment.
type EndMessageParams struct {
TxnData *TxnData
Thread *Thread
Start SegmentStartTime
Now time.Time
Logger logger.Logger
DestinationName string
Library string
DestinationType string
DestinationTemp bool
}
// EndMessageSegment ends an external segment.
func EndMessageSegment(p EndMessageParams) error {
t := p.TxnData
end, err := endSegment(t, p.Thread, p.Start, p.Now)
if nil != err {
return err
}
key := MessageMetricKey{
Library: p.Library,
DestinationType: p.DestinationType,
DestinationName: p.DestinationName,
DestinationTemp: p.DestinationTemp,
}
if nil == t.messageSegments {
t.messageSegments = make(map[MessageMetricKey]*metricData)
}
m := metricDataFromDuration(end.duration, end.exclusive)
if data, ok := t.messageSegments[key]; ok {
data.aggregate(m)
} else {
// Use `new` in place of &m so that m is not
// automatically moved to the heap.
cpy := new(metricData)
*cpy = m
t.messageSegments[key] = cpy
}
if t.TxnTrace.considerNode(end) {
attributes := end.attributes.copy()
t.saveTraceSegment(end, key.Name(), attributes, "")
}
if evt := end.spanEvent(); evt != nil {
evt.Name = key.Name()
evt.Category = spanCategoryGeneric
t.saveSpanEvent(evt)
}
return nil
}
// EndDatastoreParams contains the parameters for EndDatastoreSegment.
type EndDatastoreParams struct {
TxnData *TxnData
Thread *Thread
Start SegmentStartTime
Now time.Time
Product string
Collection string
Operation string
ParameterizedQuery string
QueryParameters map[string]interface{}
Host string
PortPathOrID string
Database string
}
const (
unknownDatastoreHost = "unknown"
unknownDatastorePortPathOrID = "unknown"
)
var (
// ThisHost is the system hostname.
ThisHost = func() string {
if h, err := sysinfo.Hostname(); nil == err {
return h
}
return unknownDatastoreHost
}()
hostsToReplace = map[string]struct{}{
"localhost": {},
"127.0.0.1": {},
"0.0.0.0": {},
"0:0:0:0:0:0:0:1": {},
"::1": {},
"0:0:0:0:0:0:0:0": {},
"::": {},
}
)
func (t TxnData) slowQueryWorthy(d time.Duration) bool {
return t.SlowQueriesEnabled && (d >= t.SlowQueryThreshold)
}
func datastoreSpanAddress(host, portPathOrID string) string {
if "" != host && "" != portPathOrID {
return host + ":" + portPathOrID
}
if "" != host {
return host
}
return portPathOrID
}
// EndDatastoreSegment ends a datastore segment.
func EndDatastoreSegment(p EndDatastoreParams) error {
end, err := endSegment(p.TxnData, p.Thread, p.Start, p.Now)
if nil != err {
return err
}
if p.Operation == "" {
p.Operation = datastoreOperationUnknown
}
if p.Product == "" {
p.Product = datastoreProductUnknown
}
if p.Host == "" && p.PortPathOrID != "" {
p.Host = unknownDatastoreHost
}
if p.PortPathOrID == "" && p.Host != "" {
p.PortPathOrID = unknownDatastorePortPathOrID
}
if _, ok := hostsToReplace[p.Host]; ok {
p.Host = ThisHost
}
// We still want to create a slowQuery if the consumer has not provided
// a Query string (or it has been removed by LASP) since the stack trace
// has value.
if p.ParameterizedQuery == "" {
collection := p.Collection
if "" == collection {
collection = "unknown"
}
p.ParameterizedQuery = fmt.Sprintf(`'%s' on '%s' using '%s'`,
p.Operation, collection, p.Product)
}
key := DatastoreMetricKey{
Product: p.Product,
Collection: p.Collection,
Operation: p.Operation,
Host: p.Host,
PortPathOrID: p.PortPathOrID,
}
if nil == p.TxnData.datastoreSegments {
p.TxnData.datastoreSegments = make(map[DatastoreMetricKey]*metricData)
}
p.TxnData.datastoreCallCount++
p.TxnData.datastoreDuration += end.duration
m := metricDataFromDuration(end.duration, end.exclusive)
if data, ok := p.TxnData.datastoreSegments[key]; ok {
data.aggregate(m)
} else {
// Use `new` in place of &m so that m is not
// automatically moved to the heap.
cpy := new(metricData)
*cpy = m
p.TxnData.datastoreSegments[key] = cpy
}
scopedMetric := datastoreScopedMetric(key)
// errors in QueryParameters must not stop the recording of the segment
queryParams, err := vetQueryParameters(p.QueryParameters)
if p.TxnData.TxnTrace.considerNode(end) {
attributes := end.attributes.copy()
attributes.addString(spanAttributeDBStatement, p.ParameterizedQuery)
attributes.addString(spanAttributeDBInstance, p.Database)
attributes.addString(spanAttributePeerAddress, datastoreSpanAddress(p.Host, p.PortPathOrID))
attributes.addString(spanAttributePeerHostname, p.Host)
if len(queryParams) > 0 {
attributes.add(spanAttributeQueryParameters, queryParams)
}
p.TxnData.saveTraceSegment(end, scopedMetric, attributes, "")
}
if p.TxnData.slowQueryWorthy(end.duration) {
if nil == p.TxnData.SlowQueries {
p.TxnData.SlowQueries = newSlowQueries(maxTxnSlowQueries)
}
p.TxnData.SlowQueries.observeInstance(slowQueryInstance{
Duration: end.duration,
DatastoreMetric: scopedMetric,
ParameterizedQuery: p.ParameterizedQuery,
QueryParameters: queryParams,
Host: p.Host,
PortPathOrID: p.PortPathOrID,
DatabaseName: p.Database,
StackTrace: GetStackTrace(),
})
}
if evt := end.spanEvent(); evt != nil {
evt.Name = scopedMetric
evt.Category = spanCategoryDatastore
evt.Kind = "client"
evt.Component = p.Product
evt.Attributes.addString(spanAttributeDBStatement, p.ParameterizedQuery)
evt.Attributes.addString(spanAttributeDBInstance, p.Database)
evt.Attributes.addString(spanAttributePeerAddress, datastoreSpanAddress(p.Host, p.PortPathOrID))
evt.Attributes.addString(spanAttributePeerHostname, p.Host)
evt.Attributes.addString(spanAttributeDBCollection, p.Collection)
p.TxnData.saveSpanEvent(evt)
}
return err
}
// MergeBreakdownMetrics creates segment metrics.
func MergeBreakdownMetrics(t *TxnData, metrics *metricTable) {
scope := t.FinalName
isWeb := t.IsWeb
// Custom Segment Metrics
for key, data := range t.customSegments {
name := customSegmentMetric(key)
// Unscoped
metrics.add(name, "", *data, unforced)
// Scoped
metrics.add(name, scope, *data, unforced)
}
// External Segment Metrics
for key, data := range t.externalSegments {
metrics.add(externalRollupMetric.all, "", *data, forced)
metrics.add(externalRollupMetric.webOrOther(isWeb), "", *data, forced)
hostMetric := externalHostMetric(key)
metrics.add(hostMetric, "", *data, unforced)
if "" != key.ExternalCrossProcessID && "" != key.ExternalTransactionName {
txnMetric := externalTransactionMetric(key)
// Unscoped CAT metrics
metrics.add(externalAppMetric(key), "", *data, unforced)
metrics.add(txnMetric, "", *data, unforced)
}
// Scoped External Metric
metrics.add(key.scopedMetric(), scope, *data, unforced)
}
// Datastore Segment Metrics
for key, data := range t.datastoreSegments {
metrics.add(datastoreRollupMetric.all, "", *data, forced)
metrics.add(datastoreRollupMetric.webOrOther(isWeb), "", *data, forced)
product := datastoreProductMetric(key)
metrics.add(product.all, "", *data, forced)
metrics.add(product.webOrOther(isWeb), "", *data, forced)
if key.Host != "" && key.PortPathOrID != "" {
instance := datastoreInstanceMetric(key)
metrics.add(instance, "", *data, unforced)
}
operation := datastoreOperationMetric(key)
metrics.add(operation, "", *data, unforced)
if "" != key.Collection {
statement := datastoreStatementMetric(key)
metrics.add(statement, "", *data, unforced)
metrics.add(statement, scope, *data, unforced)
} else {
metrics.add(operation, scope, *data, unforced)
}
}
// Message Segment Metrics
for key, data := range t.messageSegments {
metric := key.Name()
metrics.add(metric, scope, *data, unforced)
metrics.add(metric, "", *data, unforced)
}
}