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tracer.go
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tracer.go
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package opentracing
import (
"context"
"github.com/opentracing/opentracing-go"
"github.com/sour-is/instrumentedsql"
)
type tracer struct{}
type span struct {
parent opentracing.Span
}
// NewTracer returns a tracer that will fetch spans using opentracing's SpanFromContext function
func NewTracer() instrumentedsql.Tracer { return tracer{} }
// GetSpan returns a span
func (tracer) GetSpan(ctx context.Context) instrumentedsql.Span {
if ctx == nil {
return span{parent: nil}
}
return span{parent: opentracing.SpanFromContext(ctx)}
}
func (s span) NewChild(name string) instrumentedsql.Span {
if s.parent == nil {
return span{parent: opentracing.StartSpan(name)}
}
return span{parent: opentracing.StartSpan(name, opentracing.ChildOf(s.parent.Context()))}
}
func (s span) SetLabel(k, v string) {
if s.parent == nil {
return
}
s.parent.SetTag(k, v)
}
func (s span) Finish() {
if s.parent == nil {
return
}
s.parent.Finish()
}