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tracing.go
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tracing.go
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package internal
import (
"fmt"
"net/url"
"time"
"github.com/newrelic/go-agent/internal/sysinfo"
)
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 segmentFrame struct {
segmentTime
children time.Duration
}
type segmentEnd struct {
valid bool
start segmentTime
stop segmentTime
duration time.Duration
exclusive time.Duration
}
// Tracer tracks segments.
type Tracer struct {
finishedChildren time.Duration
stamp segmentStamp
currentDepth int
stack []segmentFrame
customSegments map[string]*metricData
datastoreSegments map[DatastoreMetricKey]*metricData
externalSegments map[externalMetricKey]*metricData
DatastoreExternalTotals
TxnTrace
SlowQueriesEnabled bool
SlowQueryThreshold time.Duration
SlowQueries *slowQueries
}
const (
startingStackDepthAlloc = 128
datastoreProductUnknown = "Unknown"
datastoreOperationUnknown = "other"
)
func (t *Tracer) 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,
}
}
// TracerRootChildren is used to calculate a transaction's exclusive duration.
func TracerRootChildren(t *Tracer) time.Duration {
var lostChildren time.Duration
for i := 0; i < t.currentDepth; i++ {
lostChildren += t.stack[i].children
}
return t.finishedChildren + lostChildren
}
// StartSegment begins a segment.
func StartSegment(t *Tracer, now time.Time) SegmentStartTime {
if nil == t.stack {
t.stack = make([]segmentFrame, startingStackDepthAlloc)
}
if cap(t.stack) == t.currentDepth {
newLimit := 2 * t.currentDepth
newStack := make([]segmentFrame, newLimit)
copy(newStack, t.stack)
t.stack = newStack
}
tm := t.time(now)
depth := t.currentDepth
t.currentDepth++
t.stack[depth].children = 0
t.stack[depth].segmentTime = tm
return SegmentStartTime{
Stamp: tm.Stamp,
Depth: depth,
}
}
func endSegment(t *Tracer, start SegmentStartTime, now time.Time) segmentEnd {
var s segmentEnd
if 0 == start.Stamp {
return s
}
if start.Depth >= t.currentDepth {
return s
}
if start.Depth < 0 {
return s
}
if start.Stamp != t.stack[start.Depth].Stamp {
return s
}
var children time.Duration
for i := start.Depth; i < t.currentDepth; i++ {
children += t.stack[i].children
}
s.valid = true
s.stop = t.time(now)
s.start = t.stack[start.Depth].segmentTime
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 == (t.currentDepth - 1)). However, if
// (depth < (t.currentDepth - 1)), that's ok: could be a panic popped
// some stack frames (and the consumer was not using defer).
t.currentDepth = start.Depth
if 0 == t.currentDepth {
t.finishedChildren += s.duration
} else {
t.stack[t.currentDepth-1].children += s.duration
}
return s
}
// EndBasicSegment ends a basic segment.
func EndBasicSegment(t *Tracer, start SegmentStartTime, now time.Time, name string) {
end := endSegment(t, start, now)
if !end.valid {
return
}
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) {
t.TxnTrace.witnessNode(end, customSegmentMetric(name), nil)
}
}
// EndExternalSegment ends an external segment.
func EndExternalSegment(t *Tracer, start SegmentStartTime, now time.Time, u *url.URL) {
end := endSegment(t, start, now)
if !end.valid {
return
}
host := HostFromURL(u)
if "" == host {
host = "unknown"
}
key := externalMetricKey{
Host: host,
ExternalCrossProcessID: "",
ExternalTransactionName: "",
}
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) {
t.TxnTrace.witnessNode(end, externalHostMetric(key), &traceNodeParams{
CleanURL: SafeURL(u),
})
}
}
// EndDatastoreParams contains the parameters for EndDatastoreSegment.
type EndDatastoreParams struct {
Tracer *Tracer
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 = func() string {
if h, err := sysinfo.Hostname(); nil == err {
return h
}
return unknownDatastoreHost
}()
hostsToReplace = map[string]struct{}{
"localhost": struct{}{},
"127.0.0.1": struct{}{},
"0.0.0.0": struct{}{},
"0:0:0:0:0:0:0:1": struct{}{},
"::1": struct{}{},
"0:0:0:0:0:0:0:0": struct{}{},
"::": struct{}{},
}
)
func (t Tracer) slowQueryWorthy(d time.Duration) bool {
return t.SlowQueriesEnabled && (d >= t.SlowQueryThreshold)
}
// EndDatastoreSegment ends a datastore segment.
func EndDatastoreSegment(p EndDatastoreParams) {
end := endSegment(p.Tracer, p.Start, p.Now)
if !end.valid {
return
}
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 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.Tracer.datastoreSegments {
p.Tracer.datastoreSegments = make(map[DatastoreMetricKey]*metricData)
}
p.Tracer.datastoreCallCount++
p.Tracer.datastoreDuration += end.duration
m := metricDataFromDuration(end.duration, end.exclusive)
if data, ok := p.Tracer.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.Tracer.datastoreSegments[key] = cpy
}
scopedMetric := datastoreScopedMetric(key)
queryParams := vetQueryParameters(p.QueryParameters)
if p.Tracer.TxnTrace.considerNode(end) {
p.Tracer.TxnTrace.witnessNode(end, scopedMetric, &traceNodeParams{
Host: p.Host,
PortPathOrID: p.PortPathOrID,
Database: p.Database,
Query: p.ParameterizedQuery,
queryParameters: queryParams,
})
}
if p.Tracer.slowQueryWorthy(end.duration) {
if nil == p.Tracer.SlowQueries {
p.Tracer.SlowQueries = newSlowQueries(maxTxnSlowQueries)
}
// Frames to skip:
// this function
// endDatastore
// DatastoreSegment.End
skipFrames := 3
p.Tracer.SlowQueries.observeInstance(slowQueryInstance{
Duration: end.duration,
DatastoreMetric: scopedMetric,
ParameterizedQuery: p.ParameterizedQuery,
QueryParameters: queryParams,
Host: p.Host,
PortPathOrID: p.PortPathOrID,
DatabaseName: p.Database,
StackTrace: GetStackTrace(skipFrames),
})
}
}
// MergeBreakdownMetrics creates segment metrics.
func MergeBreakdownMetrics(t *Tracer, metrics *metricTable, scope string, isWeb bool) {
// 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(externalAll, "", *data, forced)
if isWeb {
metrics.add(externalWeb, "", *data, forced)
} else {
metrics.add(externalOther, "", *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(txnMetric, scope, *data, unforced)
} else {
// Scoped External Metric
metrics.add(hostMetric, scope, *data, unforced)
}
}
// Datastore Segment Metrics
for key, data := range t.datastoreSegments {
metrics.add(datastoreAll, "", *data, forced)
product := datastoreProductMetric(key)
metrics.add(product.All, "", *data, forced)
if isWeb {
metrics.add(datastoreWeb, "", *data, forced)
metrics.add(product.Web, "", *data, forced)
} else {
metrics.add(datastoreOther, "", *data, forced)
metrics.add(product.Other, "", *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)
}
}
}