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path: root/vendor/go.opencensus.io/trace/trace.go
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Diffstat (limited to 'vendor/go.opencensus.io/trace/trace.go')
-rw-r--r--vendor/go.opencensus.io/trace/trace.go187
1 files changed, 92 insertions, 95 deletions
diff --git a/vendor/go.opencensus.io/trace/trace.go b/vendor/go.opencensus.io/trace/trace.go
index 3f8977b41..861df9d39 100644
--- a/vendor/go.opencensus.io/trace/trace.go
+++ b/vendor/go.opencensus.io/trace/trace.go
@@ -28,12 +28,16 @@ import (
"go.opencensus.io/trace/tracestate"
)
+type tracer struct{}
+
+var _ Tracer = &tracer{}
+
// Span represents a span of a trace. It has an associated SpanContext, and
// stores data accumulated while the span is active.
//
// Ideally users should interact with Spans by calling the functions in this
// package that take a Context parameter.
-type Span struct {
+type span struct {
// data contains information recorded about the span.
//
// It will be non-nil if we are exporting the span or recording events for it.
@@ -66,7 +70,7 @@ type Span struct {
// IsRecordingEvents returns true if events are being recorded for this span.
// Use this check to avoid computing expensive annotations when they will never
// be used.
-func (s *Span) IsRecordingEvents() bool {
+func (s *span) IsRecordingEvents() bool {
if s == nil {
return false
}
@@ -109,13 +113,13 @@ type SpanContext struct {
type contextKey struct{}
// FromContext returns the Span stored in a context, or nil if there isn't one.
-func FromContext(ctx context.Context) *Span {
+func (t *tracer) FromContext(ctx context.Context) *Span {
s, _ := ctx.Value(contextKey{}).(*Span)
return s
}
// NewContext returns a new context with the given Span attached.
-func NewContext(parent context.Context, s *Span) context.Context {
+func (t *tracer) NewContext(parent context.Context, s *Span) context.Context {
return context.WithValue(parent, contextKey{}, s)
}
@@ -166,12 +170,14 @@ func WithSampler(sampler Sampler) StartOption {
//
// Returned context contains the newly created span. You can use it to
// propagate the returned span in process.
-func StartSpan(ctx context.Context, name string, o ...StartOption) (context.Context, *Span) {
+func (t *tracer) StartSpan(ctx context.Context, name string, o ...StartOption) (context.Context, *Span) {
var opts StartOptions
var parent SpanContext
- if p := FromContext(ctx); p != nil {
- p.addChild()
- parent = p.spanContext
+ if p := t.FromContext(ctx); p != nil {
+ if ps, ok := p.internal.(*span); ok {
+ ps.addChild()
+ }
+ parent = p.SpanContext()
}
for _, op := range o {
op(&opts)
@@ -180,7 +186,8 @@ func StartSpan(ctx context.Context, name string, o ...StartOption) (context.Cont
ctx, end := startExecutionTracerTask(ctx, name)
span.executionTracerTaskEnd = end
- return NewContext(ctx, span), span
+ extSpan := NewSpan(span)
+ return t.NewContext(ctx, extSpan), extSpan
}
// StartSpanWithRemoteParent starts a new child span of the span from the given parent.
@@ -190,7 +197,7 @@ func StartSpan(ctx context.Context, name string, o ...StartOption) (context.Cont
//
// Returned context contains the newly created span. You can use it to
// propagate the returned span in process.
-func StartSpanWithRemoteParent(ctx context.Context, name string, parent SpanContext, o ...StartOption) (context.Context, *Span) {
+func (t *tracer) StartSpanWithRemoteParent(ctx context.Context, name string, parent SpanContext, o ...StartOption) (context.Context, *Span) {
var opts StartOptions
for _, op := range o {
op(&opts)
@@ -198,19 +205,24 @@ func StartSpanWithRemoteParent(ctx context.Context, name string, parent SpanCont
span := startSpanInternal(name, parent != SpanContext{}, parent, true, opts)
ctx, end := startExecutionTracerTask(ctx, name)
span.executionTracerTaskEnd = end
- return NewContext(ctx, span), span
+ extSpan := NewSpan(span)
+ return t.NewContext(ctx, extSpan), extSpan
}
-func startSpanInternal(name string, hasParent bool, parent SpanContext, remoteParent bool, o StartOptions) *Span {
- span := &Span{}
- span.spanContext = parent
+func startSpanInternal(name string, hasParent bool, parent SpanContext, remoteParent bool, o StartOptions) *span {
+ s := &span{}
+ s.spanContext = parent
cfg := config.Load().(*Config)
+ if gen, ok := cfg.IDGenerator.(*defaultIDGenerator); ok {
+ // lazy initialization
+ gen.init()
+ }
if !hasParent {
- span.spanContext.TraceID = cfg.IDGenerator.NewTraceID()
+ s.spanContext.TraceID = cfg.IDGenerator.NewTraceID()
}
- span.spanContext.SpanID = cfg.IDGenerator.NewSpanID()
+ s.spanContext.SpanID = cfg.IDGenerator.NewSpanID()
sampler := cfg.DefaultSampler
if !hasParent || remoteParent || o.Sampler != nil {
@@ -222,47 +234,47 @@ func startSpanInternal(name string, hasParent bool, parent SpanContext, remotePa
if o.Sampler != nil {
sampler = o.Sampler
}
- span.spanContext.setIsSampled(sampler(SamplingParameters{
+ s.spanContext.setIsSampled(sampler(SamplingParameters{
ParentContext: parent,
- TraceID: span.spanContext.TraceID,
- SpanID: span.spanContext.SpanID,
+ TraceID: s.spanContext.TraceID,
+ SpanID: s.spanContext.SpanID,
Name: name,
HasRemoteParent: remoteParent}).Sample)
}
- if !internal.LocalSpanStoreEnabled && !span.spanContext.IsSampled() {
- return span
+ if !internal.LocalSpanStoreEnabled && !s.spanContext.IsSampled() {
+ return s
}
- span.data = &SpanData{
- SpanContext: span.spanContext,
+ s.data = &SpanData{
+ SpanContext: s.spanContext,
StartTime: time.Now(),
SpanKind: o.SpanKind,
Name: name,
HasRemoteParent: remoteParent,
}
- span.lruAttributes = newLruMap(cfg.MaxAttributesPerSpan)
- span.annotations = newEvictedQueue(cfg.MaxAnnotationEventsPerSpan)
- span.messageEvents = newEvictedQueue(cfg.MaxMessageEventsPerSpan)
- span.links = newEvictedQueue(cfg.MaxLinksPerSpan)
+ s.lruAttributes = newLruMap(cfg.MaxAttributesPerSpan)
+ s.annotations = newEvictedQueue(cfg.MaxAnnotationEventsPerSpan)
+ s.messageEvents = newEvictedQueue(cfg.MaxMessageEventsPerSpan)
+ s.links = newEvictedQueue(cfg.MaxLinksPerSpan)
if hasParent {
- span.data.ParentSpanID = parent.SpanID
+ s.data.ParentSpanID = parent.SpanID
}
if internal.LocalSpanStoreEnabled {
var ss *spanStore
ss = spanStoreForNameCreateIfNew(name)
if ss != nil {
- span.spanStore = ss
- ss.add(span)
+ s.spanStore = ss
+ ss.add(s)
}
}
- return span
+ return s
}
// End ends the span.
-func (s *Span) End() {
+func (s *span) End() {
if s == nil {
return
}
@@ -292,7 +304,7 @@ func (s *Span) End() {
// makeSpanData produces a SpanData representing the current state of the Span.
// It requires that s.data is non-nil.
-func (s *Span) makeSpanData() *SpanData {
+func (s *span) makeSpanData() *SpanData {
var sd SpanData
s.mu.Lock()
sd = *s.data
@@ -317,7 +329,7 @@ func (s *Span) makeSpanData() *SpanData {
}
// SpanContext returns the SpanContext of the span.
-func (s *Span) SpanContext() SpanContext {
+func (s *span) SpanContext() SpanContext {
if s == nil {
return SpanContext{}
}
@@ -325,7 +337,7 @@ func (s *Span) SpanContext() SpanContext {
}
// SetName sets the name of the span, if it is recording events.
-func (s *Span) SetName(name string) {
+func (s *span) SetName(name string) {
if !s.IsRecordingEvents() {
return
}
@@ -335,7 +347,7 @@ func (s *Span) SetName(name string) {
}
// SetStatus sets the status of the span, if it is recording events.
-func (s *Span) SetStatus(status Status) {
+func (s *span) SetStatus(status Status) {
if !s.IsRecordingEvents() {
return
}
@@ -344,32 +356,32 @@ func (s *Span) SetStatus(status Status) {
s.mu.Unlock()
}
-func (s *Span) interfaceArrayToLinksArray() []Link {
- linksArr := make([]Link, 0)
+func (s *span) interfaceArrayToLinksArray() []Link {
+ linksArr := make([]Link, 0, len(s.links.queue))
for _, value := range s.links.queue {
linksArr = append(linksArr, value.(Link))
}
return linksArr
}
-func (s *Span) interfaceArrayToMessageEventArray() []MessageEvent {
- messageEventArr := make([]MessageEvent, 0)
+func (s *span) interfaceArrayToMessageEventArray() []MessageEvent {
+ messageEventArr := make([]MessageEvent, 0, len(s.messageEvents.queue))
for _, value := range s.messageEvents.queue {
messageEventArr = append(messageEventArr, value.(MessageEvent))
}
return messageEventArr
}
-func (s *Span) interfaceArrayToAnnotationArray() []Annotation {
- annotationArr := make([]Annotation, 0)
+func (s *span) interfaceArrayToAnnotationArray() []Annotation {
+ annotationArr := make([]Annotation, 0, len(s.annotations.queue))
for _, value := range s.annotations.queue {
annotationArr = append(annotationArr, value.(Annotation))
}
return annotationArr
}
-func (s *Span) lruAttributesToAttributeMap() map[string]interface{} {
- attributes := make(map[string]interface{})
+func (s *span) lruAttributesToAttributeMap() map[string]interface{} {
+ attributes := make(map[string]interface{}, s.lruAttributes.len())
for _, key := range s.lruAttributes.keys() {
value, ok := s.lruAttributes.get(key)
if ok {
@@ -380,13 +392,13 @@ func (s *Span) lruAttributesToAttributeMap() map[string]interface{} {
return attributes
}
-func (s *Span) copyToCappedAttributes(attributes []Attribute) {
+func (s *span) copyToCappedAttributes(attributes []Attribute) {
for _, a := range attributes {
s.lruAttributes.add(a.key, a.value)
}
}
-func (s *Span) addChild() {
+func (s *span) addChild() {
if !s.IsRecordingEvents() {
return
}
@@ -398,7 +410,7 @@ func (s *Span) addChild() {
// AddAttributes sets attributes in the span.
//
// Existing attributes whose keys appear in the attributes parameter are overwritten.
-func (s *Span) AddAttributes(attributes ...Attribute) {
+func (s *span) AddAttributes(attributes ...Attribute) {
if !s.IsRecordingEvents() {
return
}
@@ -407,49 +419,27 @@ func (s *Span) AddAttributes(attributes ...Attribute) {
s.mu.Unlock()
}
-// copyAttributes copies a slice of Attributes into a map.
-func copyAttributes(m map[string]interface{}, attributes []Attribute) {
- for _, a := range attributes {
- m[a.key] = a.value
- }
-}
-
-func (s *Span) lazyPrintfInternal(attributes []Attribute, format string, a ...interface{}) {
+func (s *span) printStringInternal(attributes []Attribute, str string) {
now := time.Now()
- msg := fmt.Sprintf(format, a...)
- var m map[string]interface{}
- s.mu.Lock()
+ var am map[string]interface{}
if len(attributes) != 0 {
- m = make(map[string]interface{})
- copyAttributes(m, attributes)
+ am = make(map[string]interface{}, len(attributes))
+ for _, attr := range attributes {
+ am[attr.key] = attr.value
+ }
}
- s.annotations.add(Annotation{
- Time: now,
- Message: msg,
- Attributes: m,
- })
- s.mu.Unlock()
-}
-
-func (s *Span) printStringInternal(attributes []Attribute, str string) {
- now := time.Now()
- var a map[string]interface{}
s.mu.Lock()
- if len(attributes) != 0 {
- a = make(map[string]interface{})
- copyAttributes(a, attributes)
- }
s.annotations.add(Annotation{
Time: now,
Message: str,
- Attributes: a,
+ Attributes: am,
})
s.mu.Unlock()
}
// Annotate adds an annotation with attributes.
// Attributes can be nil.
-func (s *Span) Annotate(attributes []Attribute, str string) {
+func (s *span) Annotate(attributes []Attribute, str string) {
if !s.IsRecordingEvents() {
return
}
@@ -457,11 +447,11 @@ func (s *Span) Annotate(attributes []Attribute, str string) {
}
// Annotatef adds an annotation with attributes.
-func (s *Span) Annotatef(attributes []Attribute, format string, a ...interface{}) {
+func (s *span) Annotatef(attributes []Attribute, format string, a ...interface{}) {
if !s.IsRecordingEvents() {
return
}
- s.lazyPrintfInternal(attributes, format, a...)
+ s.printStringInternal(attributes, fmt.Sprintf(format, a...))
}
// AddMessageSendEvent adds a message send event to the span.
@@ -470,7 +460,7 @@ func (s *Span) Annotatef(attributes []Attribute, format string, a ...interface{}
// unique in this span and the same between the send event and the receive
// event (this allows to identify a message between the sender and receiver).
// For example, this could be a sequence id.
-func (s *Span) AddMessageSendEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
+func (s *span) AddMessageSendEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
if !s.IsRecordingEvents() {
return
}
@@ -492,7 +482,7 @@ func (s *Span) AddMessageSendEvent(messageID, uncompressedByteSize, compressedBy
// unique in this span and the same between the send event and the receive
// event (this allows to identify a message between the sender and receiver).
// For example, this could be a sequence id.
-func (s *Span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
+func (s *span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
if !s.IsRecordingEvents() {
return
}
@@ -509,7 +499,7 @@ func (s *Span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compresse
}
// AddLink adds a link to the span.
-func (s *Span) AddLink(l Link) {
+func (s *span) AddLink(l Link) {
if !s.IsRecordingEvents() {
return
}
@@ -518,7 +508,7 @@ func (s *Span) AddLink(l Link) {
s.mu.Unlock()
}
-func (s *Span) String() string {
+func (s *span) String() string {
if s == nil {
return "<nil>"
}
@@ -534,20 +524,9 @@ func (s *Span) String() string {
var config atomic.Value // access atomically
func init() {
- gen := &defaultIDGenerator{}
- // initialize traceID and spanID generators.
- var rngSeed int64
- for _, p := range []interface{}{
- &rngSeed, &gen.traceIDAdd, &gen.nextSpanID, &gen.spanIDInc,
- } {
- binary.Read(crand.Reader, binary.LittleEndian, p)
- }
- gen.traceIDRand = rand.New(rand.NewSource(rngSeed))
- gen.spanIDInc |= 1
-
config.Store(&Config{
DefaultSampler: ProbabilitySampler(defaultSamplingProbability),
- IDGenerator: gen,
+ IDGenerator: &defaultIDGenerator{},
MaxAttributesPerSpan: DefaultMaxAttributesPerSpan,
MaxAnnotationEventsPerSpan: DefaultMaxAnnotationEventsPerSpan,
MaxMessageEventsPerSpan: DefaultMaxMessageEventsPerSpan,
@@ -571,6 +550,24 @@ type defaultIDGenerator struct {
traceIDAdd [2]uint64
traceIDRand *rand.Rand
+
+ initOnce sync.Once
+}
+
+// init initializes the generator on the first call to avoid consuming entropy
+// unnecessarily.
+func (gen *defaultIDGenerator) init() {
+ gen.initOnce.Do(func() {
+ // initialize traceID and spanID generators.
+ var rngSeed int64
+ for _, p := range []interface{}{
+ &rngSeed, &gen.traceIDAdd, &gen.nextSpanID, &gen.spanIDInc,
+ } {
+ binary.Read(crand.Reader, binary.LittleEndian, p)
+ }
+ gen.traceIDRand = rand.New(rand.NewSource(rngSeed))
+ gen.spanIDInc |= 1
+ })
}
// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-10-10 20:35:47 +0000