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139 lines
3.9 KiB
Go
139 lines
3.9 KiB
Go
package trace
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import (
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"context"
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"fmt"
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"net/url"
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"contrib.go.opencensus.io/exporter/jaeger"
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ocZipkin "contrib.go.opencensus.io/exporter/zipkin"
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datadog "github.com/DataDog/opencensus-go-exporter-datadog"
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"github.com/openzipkin/zipkin-go"
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zipkinHTTP "github.com/openzipkin/zipkin-go/reporter/http"
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"go.opencensus.io/trace"
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"github.com/pomerium/pomerium/internal/log"
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)
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const (
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// DatadogTracingProviderName is the name of the tracing provider Datadog.
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DatadogTracingProviderName = "datadog"
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// JaegerTracingProviderName is the name of the tracing provider Jaeger.
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JaegerTracingProviderName = "jaeger"
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// ZipkinTracingProviderName is the name of the tracing provider Zipkin.
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ZipkinTracingProviderName = "zipkin"
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)
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// TracingOptions contains the configurations settings for a http server.
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type TracingOptions struct {
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// Shared
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Provider string
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Service string
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Debug bool
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// Datadog
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DatadogAddress string
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// Jaeger
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// CollectorEndpoint is the full url to the Jaeger HTTP Thrift collector.
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// For example, http://localhost:14268/api/traces
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JaegerCollectorEndpoint *url.URL
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// AgentEndpoint instructs exporter to send spans to jaeger-agent at this address.
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// For example, localhost:6831.
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JaegerAgentEndpoint string
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// Zipkin
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// ZipkinEndpoint configures the zipkin collector URI
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// Example: http://zipkin:9411/api/v2/spans
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ZipkinEndpoint *url.URL
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// SampleRate is percentage of requests which are sampled
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SampleRate float64
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}
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// Enabled indicates whether tracing is enabled on a given TracingOptions
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func (t *TracingOptions) Enabled() bool {
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return t.Provider != ""
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}
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// RegisterTracing creates a new trace exporter from TracingOptions.
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func RegisterTracing(opts *TracingOptions) (trace.Exporter, error) {
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var exporter trace.Exporter
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var err error
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switch opts.Provider {
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case DatadogTracingProviderName:
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exporter, err = registerDatadog(opts)
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case JaegerTracingProviderName:
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exporter, err = registerJaeger(opts)
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case ZipkinTracingProviderName:
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exporter, err = registerZipkin(opts)
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default:
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return nil, fmt.Errorf("telemetry/trace: provider %s unknown", opts.Provider)
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}
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if err != nil {
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return nil, err
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}
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trace.ApplyConfig(trace.Config{DefaultSampler: trace.ProbabilitySampler(opts.SampleRate)})
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log.Debug(context.TODO()).Interface("Opts", opts).Msg("telemetry/trace: exporter created")
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return exporter, nil
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}
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// UnregisterTracing unregisters a trace exporter.
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func UnregisterTracing(exporter trace.Exporter) {
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trace.UnregisterExporter(exporter)
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}
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func registerDatadog(opts *TracingOptions) (trace.Exporter, error) {
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dOpts := datadog.Options{
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Service: opts.Service,
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TraceAddr: opts.DatadogAddress,
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}
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dex, err := datadog.NewExporter(dOpts)
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if err != nil {
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return nil, err
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}
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trace.RegisterExporter(dex)
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return dex, nil
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}
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func registerJaeger(opts *TracingOptions) (trace.Exporter, error) {
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jOpts := jaeger.Options{
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ServiceName: opts.Service,
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AgentEndpoint: opts.JaegerAgentEndpoint,
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}
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if opts.JaegerCollectorEndpoint != nil {
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jOpts.CollectorEndpoint = opts.JaegerCollectorEndpoint.String()
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}
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jex, err := jaeger.NewExporter(jOpts)
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if err != nil {
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return nil, err
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}
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trace.RegisterExporter(jex)
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return jex, nil
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}
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func registerZipkin(opts *TracingOptions) (trace.Exporter, error) {
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localEndpoint, err := zipkin.NewEndpoint(opts.Service, "")
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if err != nil {
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return nil, fmt.Errorf("telemetry/trace: could not create local endpoint: %w", err)
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}
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reporter := zipkinHTTP.NewReporter(opts.ZipkinEndpoint.String())
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exporter := ocZipkin.NewExporter(reporter, localEndpoint)
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trace.RegisterExporter(exporter)
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return exporter, nil
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}
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// StartSpan starts a new child span of the current span in the context. If
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// there is no span in the context, creates a new trace and span.
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//
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// Returned context contains the newly created span. You can use it to
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// propagate the returned span in process.
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func StartSpan(ctx context.Context, name string, o ...trace.StartOption) (context.Context, *trace.Span) {
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return trace.StartSpan(ctx, name, o...)
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}
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