/
dt_span.go
106 lines (87 loc) · 2.86 KB
/
dt_span.go
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// Copyright 2022 Dynatrace LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"context"
"errors"
"go.opentelemetry.io/otel/attribute"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
)
type dtSpan struct {
trace.Span
tracer *dtTracer
metadata *dtSpanMetadata
}
func (s *dtSpan) End(options ...trace.SpanEndOption) {
if !s.IsRecording() {
return
}
s.Span.End(options...)
s.tracer.provider.processor.onEnd(s)
}
func (s *dtSpan) TracerProvider() trace.TracerProvider {
return s.tracer.provider
}
func (s *dtSpan) readOnlySpan() (sdktrace.ReadOnlySpan, error) {
if readOnlySpan, ok := s.Span.(sdktrace.ReadOnlySpan); ok {
return readOnlySpan, nil
}
return nil, errors.New("span is not a ReadOnlySpan")
}
func (s *dtSpan) SpanContext() trace.SpanContext {
spanCtx := s.Span.SpanContext()
// add FW4 tag to tracestate if available
if parentTag := s.metadata.getFw4Tag(); parentTag != nil {
tag := parentTag.Propagate(spanCtx)
ts, err := spanCtx.TraceState().Insert(tag.TraceStateKey(), tag.ToTracestateEntryValueWithoutTraceId())
if err != nil {
s.tracer.provider.logger.Infof("Can not add FW4 Tag to tracestate: %s", err)
return spanCtx
}
return spanCtx.WithTraceState(ts)
}
return spanCtx
}
// dtSpanFromContext return Dynatrace span instance from given context, nil if Dynatrace span is not found.
func dtSpanFromContext(ctx context.Context) *dtSpan {
if s := trace.SpanFromContext(ctx); s != nil {
if span, ok := s.(*dtSpan); ok {
return span
}
}
return nil
}
// prepareSend evaluates whether a span should be sent to Dynatrace Cluster and updates the metadata accordingly
func (s *dtSpan) prepareSend(sendTime int64) prepareResult {
// No need to handle error, prepareSend will only ever be called on spans in the watchlist
// which conform to the ReadWriteSpan interface
readOnlySpan, _ := s.readOnlySpan()
sdkSpanEnded := readOnlySpan.EndTime().IsZero()
shouldSend := s.metadata.evaluateSendState(sendTime, !sdkSpanEnded)
if shouldSend == prepareResultSend {
s.metadata.lastSentMs = sendTime
s.metadata.seqNumber++
}
return shouldSend
}
func attributesFromSpan(span trace.Span) []attribute.KeyValue {
if dtSpan, ok := span.(*dtSpan); ok {
span = dtSpan.Span
}
if readWriteSpan, ok := span.(sdktrace.ReadWriteSpan); ok {
return readWriteSpan.Attributes()
}
return nil
}