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tracer.go
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tracer.go
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package telemetry
import (
"context"
"fmt"
"time"
"github.com/xigxog/kubefox/libs/core/kubefox"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
var (
otelTracer = otel.Tracer("")
)
type Span interface {
End(*kubefox.Event)
}
type span struct {
cancel context.CancelFunc
otelSpan trace.Span
req *kubefox.Event
}
func NewSpan(ctx context.Context, timeout time.Duration, req *kubefox.Event) (context.Context, Span) {
ctx, cancel := context.WithTimeout(ctx, timeout)
typ := kubefox.EventTypeUnknown
if req.Type != "" {
typ = kubefox.EventType(req.Type)
}
trcId, _ := trace.TraceIDFromHex(req.TraceId())
spnId, _ := trace.SpanIDFromHex(req.SpanId())
trcFlags := trace.TraceFlags(req.TraceFlags())
ctx = trace.ContextWithRemoteSpanContext(ctx, trace.NewSpanContext(
trace.SpanContextConfig{
TraceID: trcId,
SpanID: spnId,
TraceFlags: trcFlags,
}))
ctx, otelSpan := otelTracer.Start(ctx, fmt.Sprintf("%s event", typ),
trace.WithAttributes(traceAttrs(req)...),
)
req.SetTraceId(otelSpan.SpanContext().TraceID().String())
req.SetSpanId(otelSpan.SpanContext().SpanID().String())
req.SetTraceFlags(byte(otelSpan.SpanContext().TraceFlags()))
return ctx, &span{
cancel: cancel,
otelSpan: otelSpan,
req: req,
}
}
func (sp *span) End(resp *kubefox.Event) {
if resp != nil {
sp.otelSpan.SetAttributes(traceAttrs(resp)...)
resp.SetTraceId(sp.otelSpan.SpanContext().TraceID().String())
resp.SetSpanId(sp.otelSpan.SpanContext().SpanID().String())
resp.SetTraceFlags(byte(sp.otelSpan.SpanContext().TraceFlags()))
// TODO decide on how to deal with errors
// if err := resp.GetError(); err != nil {
// sp.otelSpan.RecordError(err)
// sp.otelSpan.SetStatus(codes.Error, err.Error())
// }
}
sp.otelSpan.End()
sp.cancel()
}
func traceAttrs(req *kubefox.Event) []attribute.KeyValue {
attrs := []attribute.KeyValue{}
if req != nil && req.Type != "" {
attrs = append(attrs, attribute.Key("kubefox.event.type").String(req.Type))
}
if req != nil && req.Id != "" {
attrs = append(attrs, attribute.Key("kubefox.event.id").String(req.Id))
}
if req != nil && req.ParentId != "" {
attrs = append(attrs, attribute.Key("kubefox.event.parent-id").String(req.ParentId))
}
if req != nil && req.Source != nil {
attrs = append(attrs, attribute.Key("kubefox.event.source").String(req.Source.Key()))
}
if req != nil && req.Target != nil {
attrs = append(attrs, attribute.Key("kubefox.event.target").String(req.Source.Key()))
}
return attrs
}