tvl-depot/tvix/nar-bridge/cmd/nar-bridge-http/otel.go
Connor Brewster d056329412 feat(tvix/store/nar-bridge): Setup OpenTelemetry
Sets up OpenTelemetry integration for nar-bridge. Right now it will
export spans for HTTP server requests and all gRPC client requests.
Having the spans available will make performance work significantly
easier as it provides a high level overview of where time is being
spent.

In the future we can add application-specifc metrics and
integrate logrus.

Change-Id: Ie3860675d7ffc626a95673ba062c3c798d8bb2a7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10678
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Connor Brewster <cbrewster@hey.com>
2024-01-23 15:50:53 +00:00

87 lines
2.3 KiB
Go

package main
import (
"context"
"errors"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
func setupOpenTelemetry(ctx context.Context, serviceName, serviceVersion string) (func(context.Context) error, error) {
var shutdownFuncs []func(context.Context) error
shutdown := func(ctx context.Context) error {
var err error
for _, fn := range shutdownFuncs {
err = errors.Join(err, fn(ctx))
}
shutdownFuncs = nil
return err
}
res, err := resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName(serviceName),
semconv.ServiceVersion(serviceVersion),
),
)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
prop := propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
)
otel.SetTextMapPropagator(prop)
tracerProvider, err := newTraceProvider(ctx, res)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
otel.SetTracerProvider(tracerProvider)
meterProvider, err := newMeterProvider(ctx, res)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
otel.SetMeterProvider(meterProvider)
return shutdown, nil
}
func newTraceProvider(ctx context.Context, res *resource.Resource) (*trace.TracerProvider, error) {
traceExporter, err := otlptracegrpc.New(ctx)
if err != nil {
return nil, err
}
traceProvider := trace.NewTracerProvider(
trace.WithBatcher(traceExporter),
trace.WithResource(res),
)
return traceProvider, nil
}
func newMeterProvider(ctx context.Context, res *resource.Resource) (*metric.MeterProvider, error) {
metricExporter, err := otlpmetricgrpc.New(ctx)
if err != nil {
return nil, err
}
meterProvider := metric.NewMeterProvider(
metric.WithResource(res),
metric.WithReader(metric.NewPeriodicReader(metricExporter)),
)
return meterProvider, nil
}