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82 lines
2.1 KiB
82 lines
2.1 KiB
package tracing
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import (
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"context"
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"fmt"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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"go.opentelemetry.io/otel/propagation"
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"go.opentelemetry.io/otel/trace"
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"google.golang.org/protobuf/proto"
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"github.com/go-kratos/kratos/v2/errors"
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)
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// Tracer is otel span tracer
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type Tracer struct {
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tracer trace.Tracer
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kind trace.SpanKind
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opt *options
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}
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// NewTracer create tracer instance
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func NewTracer(kind trace.SpanKind, opts ...Option) *Tracer {
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op := options{
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propagator: propagation.NewCompositeTextMapPropagator(Metadata{}, propagation.Baggage{}, propagation.TraceContext{}),
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tracerName: "kratos",
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}
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for _, o := range opts {
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o(&op)
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}
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if op.tracerProvider != nil {
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otel.SetTracerProvider(op.tracerProvider)
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}
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switch kind {
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case trace.SpanKindClient:
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return &Tracer{tracer: otel.Tracer(op.tracerName), kind: kind, opt: &op}
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case trace.SpanKindServer:
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return &Tracer{tracer: otel.Tracer(op.tracerName), kind: kind, opt: &op}
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default:
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panic(fmt.Sprintf("unsupported span kind: %v", kind))
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}
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}
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// Start start tracing span
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func (t *Tracer) Start(ctx context.Context, operation string, carrier propagation.TextMapCarrier) (context.Context, trace.Span) {
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if t.kind == trace.SpanKindServer {
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ctx = t.opt.propagator.Extract(ctx, carrier)
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}
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ctx, span := t.tracer.Start(ctx,
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operation,
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trace.WithSpanKind(t.kind),
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)
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if t.kind == trace.SpanKindClient {
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t.opt.propagator.Inject(ctx, carrier)
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}
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return ctx, span
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}
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// End finish tracing span
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func (t *Tracer) End(ctx context.Context, span trace.Span, m interface{}, err error) {
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if err != nil {
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span.RecordError(err)
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if e := errors.FromError(err); e != nil {
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span.SetAttributes(attribute.Key("rpc.status_code").Int64(int64(e.Code)))
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}
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span.SetStatus(codes.Error, err.Error())
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} else {
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span.SetStatus(codes.Ok, "OK")
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}
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if p, ok := m.(proto.Message); ok {
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if t.kind == trace.SpanKindServer {
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span.SetAttributes(attribute.Key("send_msg.size").Int(proto.Size(p)))
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} else {
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span.SetAttributes(attribute.Key("recv_msg.size").Int(proto.Size(p)))
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}
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}
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span.End()
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}
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