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package delegated
import (
"context"
"sync"
"github.com/moby/buildkit/util/tracing/detect"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
const maxBuffer = 256
var exp = &Exporter{}
func init() {
detect.Register("delegated", func() (sdktrace.SpanExporter, sdkmetric.Exporter, error) {
return exp, nil, nil
}, 100)
}
type Exporter struct {
mu sync.Mutex
exporters []sdktrace.SpanExporter
buffer []sdktrace.ReadOnlySpan
}
var _ sdktrace.SpanExporter = &Exporter{}
func (e *Exporter) ExportSpans(ctx context.Context, ss []sdktrace.ReadOnlySpan) error {
e.mu.Lock()
defer e.mu.Unlock()
var err error
for _, e := range e.exporters {
if err1 := e.ExportSpans(ctx, ss); err1 != nil {
err = err1
}
}
if err != nil {
return err
}
if len(e.buffer) > maxBuffer {
return nil
}
e.buffer = append(e.buffer, ss...)
return nil
}
func (e *Exporter) Shutdown(ctx context.Context) error {
e.mu.Lock()
defer e.mu.Unlock()
var err error
for _, e := range e.exporters {
if err1 := e.Shutdown(ctx); err1 != nil {
err = err1
}
}
return err
}
func (e *Exporter) SetSpanExporter(ctx context.Context, exp sdktrace.SpanExporter) error {
e.mu.Lock()
defer e.mu.Unlock()
e.exporters = append(e.exporters, exp)
if len(e.buffer) > 0 {
return exp.ExportSpans(ctx, e.buffer)
}
return nil
}
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