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tracing.go
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tracing.go
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package o11y
import (
"context"
"fmt"
"net/url"
"github.com/nais/unleasherator/pkg/config"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
func InitTracing(ctx context.Context, config *config.Config) (*sdktrace.TracerProvider, error) {
var tp *sdktrace.TracerProvider
exp, err := newTraceExporter(ctx, config)
if err != nil {
return nil, err
}
r, err := resourceFromConfig(config)
if err != nil {
return nil, err
}
tp = sdktrace.NewTracerProvider(sdktrace.WithResource(r))
if config.OpenTelemetry.TracesExporter != "none" {
tp.RegisterSpanProcessor(sdktrace.NewBatchSpanProcessor(exp))
}
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp, nil
}
func resourceFromConfig(config *config.Config) (*resource.Resource, error) {
return resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName(fmt.Sprintf("unleasherator-%s", config.ClusterName)),
semconv.ServiceInstanceID(config.PodName),
semconv.ServiceNamespace(config.PodNamespace),
semconv.K8SClusterName(config.ClusterName),
),
)
}
func newTraceExporter(ctx context.Context, config *config.Config) (sdktrace.SpanExporter, error) {
switch config.OpenTelemetry.TracesExporter {
case "stdout":
return newStdoutTraceExporter(ctx)
case "otlp":
switch config.OpenTelemetry.ExporterOtlpProtocol {
case "grpc":
return newOtlpGrpcTraceExporter(ctx, config)
case "http":
return newOtlpHttpTraceExporter(ctx, config)
default:
return nil, fmt.Errorf("unsupported otlp exporter protocol %q", config.OpenTelemetry.ExporterOtlpProtocol)
}
case "none":
return nil, nil
default:
return nil, fmt.Errorf("unsupported traces exporter %q", config.OpenTelemetry.TracesExporter)
}
}
func newStdoutTraceExporter(ctx context.Context) (sdktrace.SpanExporter, error) {
return stdouttrace.New(stdouttrace.WithPrettyPrint())
}
func hostportSchemeFromUrl(rawUrl string) (string, string, error) {
url, err := url.Parse(rawUrl)
if err != nil {
return "", "", err
}
port := url.Port()
if port == "" {
if url.Scheme == "http" {
port = "80"
} else {
port = "443"
}
}
return fmt.Sprintf("%s:%s", url.Hostname(), port), url.Scheme, nil
}
func newOtlpGrpcTraceExporter(ctx context.Context, config *config.Config) (sdktrace.SpanExporter, error) {
hostport, scheme, err := hostportSchemeFromUrl(config.OpenTelemetry.ExporterOtlpEndpoint)
if err != nil {
return nil, err
}
if scheme == "http" {
return otlptracegrpc.New(ctx, otlptracegrpc.WithEndpoint(hostport), otlptracegrpc.WithInsecure())
} else {
return otlptracegrpc.New(ctx, otlptracegrpc.WithEndpoint(hostport))
}
}
func newOtlpHttpTraceExporter(ctx context.Context, config *config.Config) (sdktrace.SpanExporter, error) {
hostport, scheme, err := hostportSchemeFromUrl(config.OpenTelemetry.ExporterOtlpEndpoint)
if err != nil {
return nil, err
}
if scheme == "http" {
return otlptracehttp.New(ctx, otlptracehttp.WithEndpoint(hostport), otlptracehttp.WithInsecure())
} else {
return otlptracehttp.New(ctx, otlptracehttp.WithEndpoint(hostport))
}
}