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exporter.go
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exporter.go
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package tracing
import (
"context"
"github.com/go-logr/logr"
"github.com/hashicorp/go-multierror"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.14.0"
ddotel "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/opentelemetry"
ddtracer "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
ddprofiler "gopkg.in/DataDog/dd-trace-go.v1/profiler"
"golang.org/x/xerrors"
"google.golang.org/grpc/credentials"
)
// TracerOpts specifies which telemetry exporters should be configured.
type TracerOpts struct {
// Default exports to a backend configured by environment variables. See:
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
Default bool
// DataDog exports traces and profiles to the local DataDog daemon.
DataDog bool
// Exports traces to Honeycomb.io with the provided API key.
Honeycomb string
}
// TracerProvider creates a grpc otlp exporter and configures a trace provider.
// Caller is responsible for calling TracerProvider.Shutdown to ensure all data is flushed.
func TracerProvider(ctx context.Context, service string, opts TracerOpts) (*sdktrace.TracerProvider, func(context.Context) error, error) {
res := resource.NewWithAttributes(
semconv.SchemaURL,
// the service name used to display traces in backends
semconv.ServiceNameKey.String(service),
)
var (
tracerOpts = []sdktrace.TracerProviderOption{
sdktrace.WithResource(res),
}
closers = []func(context.Context) error{}
)
if opts.DataDog {
// See more:
// https://docs.datadoghq.com/tracing/metrics/runtime_metrics/go/
dd := ddotel.NewTracerProvider(ddtracer.WithRuntimeMetrics())
closers = append(closers, func(_ context.Context) error {
// For some reason, this doesn't appear to actually wind down
// the goroutines.
return dd.Shutdown()
})
// See https://docs.datadoghq.com/profiler/enabling/go/
_ = ddprofiler.Start(
ddprofiler.WithService("coderd"),
ddprofiler.WithProfileTypes(
ddprofiler.CPUProfile,
ddprofiler.HeapProfile,
ddprofiler.GoroutineProfile,
// In the future, we may want to enable:
// ddprofiler.BlockProfile,
// ddprofiler.MutexProfile,
),
)
closers = append(closers, func(_ context.Context) error {
ddprofiler.Stop()
return nil
})
}
if opts.Default {
exporter, err := DefaultExporter(ctx)
if err != nil {
return nil, nil, xerrors.Errorf("default exporter: %w", err)
}
closers = append(closers, exporter.Shutdown)
tracerOpts = append(tracerOpts, sdktrace.WithBatcher(exporter))
}
if opts.Honeycomb != "" {
exporter, err := HoneycombExporter(ctx, opts.Honeycomb)
if err != nil {
return nil, nil, xerrors.Errorf("honeycomb exporter: %w", err)
}
closers = append(closers, exporter.Shutdown)
tracerOpts = append(tracerOpts, sdktrace.WithBatcher(exporter))
}
tracerProvider := sdktrace.NewTracerProvider(tracerOpts...)
otel.SetTracerProvider(tracerProvider)
// Ignore otel errors!
otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {}))
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
),
)
otel.SetLogger(logr.Discard())
return tracerProvider, func(ctx context.Context) error {
var merr error
err := tracerProvider.ForceFlush(ctx)
if err != nil {
merr = multierror.Append(merr, xerrors.Errorf("tracerProvider.ForceFlush(): %w", err))
}
for i, closer := range closers {
err = closer(ctx)
if err != nil {
merr = multierror.Append(merr, xerrors.Errorf("closer() %d: %w", i, err))
}
}
err = tracerProvider.Shutdown(ctx)
if err != nil {
merr = multierror.Append(merr, xerrors.Errorf("tracerProvider.Shutdown(): %w", err))
}
return merr
}, nil
}
func DefaultExporter(ctx context.Context) (*otlptrace.Exporter, error) {
exporter, err := otlptrace.New(ctx, otlptracegrpc.NewClient(otlptracegrpc.WithInsecure()))
if err != nil {
return nil, xerrors.Errorf("create otlp exporter: %w", err)
}
return exporter, nil
}
func HoneycombExporter(ctx context.Context, apiKey string) (*otlptrace.Exporter, error) {
opts := []otlptracegrpc.Option{
otlptracegrpc.WithEndpoint("api.honeycomb.io:443"),
otlptracegrpc.WithHeaders(map[string]string{
"x-honeycomb-team": apiKey,
}),
otlptracegrpc.WithTLSCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
exporter, err := otlptrace.New(ctx, otlptracegrpc.NewClient(opts...))
if err != nil {
return nil, xerrors.Errorf("create otlp exporter: %w", err)
}
return exporter, nil
}