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provider和trace 持续分析。

关于traceId生成与traceId复用

当前运行的trace
/pkg/mod/go.opentelemetry.io/otel/sdk@v1.13.0/trace/provider.go
         
生成traceId
/pkg/mod/go.opentelemetry.io/otel/sdk@v1.13.0/trace/tracer.go
    r.provider.idGenerator.NewIDs(ctx)
             
             
负责生成的结构体
// tracerProviderConfig.
type tracerProviderConfig struct {
    // processors contains collection of SpanProcessors that are processing pipeline
    // for spans in the trace signal.
    // SpanProcessors registered with a TracerProvider and are called at the start
    // and end of a Span's lifecycle, and are called in the order they are
    // registered.
    processors []SpanProcessor
 
    // sampler is the default sampler used when creating new spans.
    sampler Sampler
 
    // idGenerator is used to generate all Span and Trace IDs when needed.
    idGenerator IDGenerator //该对象负责具体生成
 
    // spanLimits defines the attribute, event, and link limits for spans.
    spanLimits SpanLimits
 
    // resource contains attributes representing an entity that produces telemetry.
    resource *resource.Resource
}
 
复用traceId示例
func generateSpan(t *testing.T, tr trace.Tracer, option testOption) {
    sc := getSpanContext()
 
    for i := 0; i < option.genNumSpans; i++ {
        tid := sc.TraceID()
        binary.BigEndian.PutUint64(tid[0:8], uint64(i+1))
        newSc := sc.WithTraceID(tid)
        ctx := trace.ContextWithRemoteSpanContext(context.Background(), newSc)
        _, span := tr.Start(ctx, option.name)
        span.End()
    }
}
　　