106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors All rights reserved.
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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 trace
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import (
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"context"
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"fmt"
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"os"
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"go.opentelemetry.io/otel"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/trace"
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"k8s.io/klog/v2"
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texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
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"github.com/pkg/errors"
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)
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const (
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// ProjectEnvVar is the name of the env variable that the user must pass in their GCP project ID through
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ProjectEnvVar = "MINIKUBE_GCP_PROJECT_ID"
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// this is the name of the parent span to help identify it
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// in the Cloud Trace UI.
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parentSpanName = "minikube start"
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)
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type gcpTracer struct {
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projectID string
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parentCtx context.Context
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trace.Tracer
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spans map[string]trace.Span
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cleanup func()
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}
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// StartSpan starts a span for the next step of
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// `minikube start` via the GCP tracer
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func (t *gcpTracer) StartSpan(name string) {
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_, span := t.Tracer.Start(t.parentCtx, name)
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t.spans[name] = span
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}
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// EndSpan ends the most recent span, indicating
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// that one step of `minikube start` has completed
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func (t *gcpTracer) EndSpan(name string) {
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span, ok := t.spans[name]
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if !ok {
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klog.Warningf("cannot end span %s as it was never started", name)
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return
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}
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span.End()
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}
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func (t *gcpTracer) Cleanup() {
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span, ok := t.spans[parentSpanName]
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if ok {
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span.End()
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}
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t.cleanup()
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}
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func initGCPTracer() (*gcpTracer, error) {
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projectID := os.Getenv(ProjectEnvVar)
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if projectID == "" {
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return nil, fmt.Errorf("GCP tracer requires a valid GCP project id set via the %s env variable", ProjectEnvVar)
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}
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_, flush, err := texporter.InstallNewPipeline(
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[]texporter.Option{
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texporter.WithProjectID(projectID),
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},
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sdktrace.WithConfig(sdktrace.Config{
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DefaultSampler: sdktrace.AlwaysSample(),
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}),
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)
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if err != nil {
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return nil, errors.Wrap(err, "installing pipeline")
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}
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t := otel.Tracer(parentSpanName)
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ctx, span := t.Start(context.Background(), parentSpanName)
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return &gcpTracer{
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projectID: projectID,
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parentCtx: ctx,
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cleanup: flush,
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Tracer: t,
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spans: map[string]trace.Span{
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parentSpanName: span,
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},
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}, nil
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}
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