mirror of
https://github.com/ceph/ceph-csi.git
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99 lines
3.7 KiB
Go
99 lines
3.7 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tracing
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import (
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"context"
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"time"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/trace"
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utiltrace "k8s.io/utils/trace"
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)
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const instrumentationScope = "k8s.io/component-base/tracing"
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// Start creates spans using both OpenTelemetry, and the k8s.io/utils/trace package.
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// It only creates an OpenTelemetry span if the incoming context already includes a span.
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func Start(ctx context.Context, name string, attributes ...attribute.KeyValue) (context.Context, *Span) {
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// If the incoming context already includes an OpenTelemetry span, create a child span with the provided name and attributes.
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// If the caller is not using OpenTelemetry, or has tracing disabled (e.g. with a component-specific feature flag), this is a noop.
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ctx, otelSpan := trace.SpanFromContext(ctx).TracerProvider().Tracer(instrumentationScope).Start(ctx, name, trace.WithAttributes(attributes...))
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// If there is already a utiltrace span in the context, use that as our parent span.
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utilSpan := utiltrace.FromContext(ctx).Nest(name, attributesToFields(attributes)...)
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// Set the trace as active in the context so that subsequent Start calls create nested spans.
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return utiltrace.ContextWithTrace(ctx, utilSpan), &Span{
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otelSpan: otelSpan,
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utilSpan: utilSpan,
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}
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}
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// Span is a component part of a trace. It represents a single named
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// and timed operation of a workflow being observed.
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// This Span is a combination of an OpenTelemetry and k8s.io/utils/trace span
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// to facilitate the migration to OpenTelemetry.
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type Span struct {
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otelSpan trace.Span
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utilSpan *utiltrace.Trace
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}
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// AddEvent adds a point-in-time event with a name and attributes.
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func (s *Span) AddEvent(name string, attributes ...attribute.KeyValue) {
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s.otelSpan.AddEvent(name, trace.WithAttributes(attributes...))
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if s.utilSpan != nil {
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s.utilSpan.Step(name, attributesToFields(attributes)...)
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}
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}
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// End ends the span, and logs if the span duration is greater than the logThreshold.
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func (s *Span) End(logThreshold time.Duration) {
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s.otelSpan.End()
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if s.utilSpan != nil {
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s.utilSpan.LogIfLong(logThreshold)
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}
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}
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// RecordError will record err as an exception span event for this span.
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// If this span is not being recorded or err is nil then this method does nothing.
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func (s *Span) RecordError(err error, attributes ...attribute.KeyValue) {
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s.otelSpan.RecordError(err, trace.WithAttributes(attributes...))
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}
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func attributesToFields(attributes []attribute.KeyValue) []utiltrace.Field {
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fields := make([]utiltrace.Field, len(attributes))
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for i := range attributes {
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attr := attributes[i]
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fields[i] = utiltrace.Field{Key: string(attr.Key), Value: attr.Value.AsInterface()}
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}
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return fields
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}
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// SpanFromContext returns the *Span from the current context. It is composed of the active
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// OpenTelemetry and k8s.io/utils/trace spans.
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func SpanFromContext(ctx context.Context) *Span {
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return &Span{
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otelSpan: trace.SpanFromContext(ctx),
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utilSpan: utiltrace.FromContext(ctx),
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}
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}
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// ContextWithSpan returns a context with the Span included in the context.
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func ContextWithSpan(ctx context.Context, s *Span) context.Context {
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return trace.ContextWithSpan(utiltrace.ContextWithTrace(ctx, s.utilSpan), s.otelSpan)
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}
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