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3 years ago
package log_test
import (
"context"
"fmt"
"io"
"gitoa.ru/go-4devs/log"
"gitoa.ru/go-4devs/log/field"
"gitoa.ru/go-4devs/log/handler/otel"
apitrace "go.opentelemetry.io/otel/api/trace"
"go.opentelemetry.io/otel/sdk/export/trace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
func ExampleNew_withTrace() {
logger := log.New(log.WithStdout()).With(otel.Middleware())
sctx, span := startSpan(ctx)
logger.Err(sctx, "log logrus")
logger.ErrKV(sctx, "log logrus kv", field.Int("int", 42))
logger.ErrKVs(sctx, "log logrus kv sugar", "err", io.EOF)
span.End()
// Output:
// msg="log logrus"
// msg="log logrus kv" int=42
// msg="log logrus kv sugar" err=EOF
// event: log logrus, SeverityText = ERROR, SeverityNumber = 17
// event: log logrus kv, SeverityText = ERROR, SeverityNumber = 17, int = 42
// event: log logrus kv sugar, SeverityText = ERROR, SeverityNumber = 17, err = EOF
}
func startSpan(ctx context.Context) (context.Context, apitrace.Span) {
tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exporter{}))
return tp.Tracer("logger").Start(ctx, "operation")
}
type exporter struct{}
func (e exporter) Shutdown(_ context.Context) error {
return nil
}
func (e exporter) ExportSpans(ctx context.Context, spanData []*trace.SpanData) error {
for _, data := range spanData {
for _, events := range data.MessageEvents {
fmt.Print("event: ", events.Name)
for _, attr := range events.Attributes {
fmt.Printf(", %v = %v", attr.Key, attr.Value.AsInterface())
}
fmt.Print("\n")
}
}
return nil
}