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[chore] Simplify the OTEL setup (#4110)

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# Description

This simplifies our OTEL setup by:

* Getting rid of some deprecated things.
* Using `autoexport` and letting things get configured by the `OTEL_` environment variables.
* Removing all the unnecessary config options.

## Checklist

Please put an x inside each checkbox to indicate that you've read and followed it: `[ ]` -> `[x]`

If this is a documentation change, only the first checkbox must be filled (you can delete the others if you want).

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [ ] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4110
Reviewed-by: tobi <kipvandenbos@noreply.codeberg.org>
Co-authored-by: Daenney <daenney@noreply.codeberg.org>
Co-committed-by: Daenney <daenney@noreply.codeberg.org>
This commit is contained in:
Daenney 2025-05-05 16:22:45 +00:00 • committed by tobi
commit ecbdc4227b
145 changed files with 21740 additions and 1319 deletions
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Package autoexport provides OpenTelemetry exporter factory functions
// with defaults and environment variable support as defined by the
// OpenTelemetry specification.
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"os"
"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
"go.opentelemetry.io/otel/exporters/stdout/stdoutlog"
"go.opentelemetry.io/otel/sdk/log"
)
const otelExporterOTLPLogsProtoEnvKey = "OTEL_EXPORTER_OTLP_LOGS_PROTOCOL"
// LogOption applies an autoexport configuration option.
type LogOption = option[log.Exporter]
var logsSignal = newSignal[log.Exporter]("OTEL_LOGS_EXPORTER")
// WithFallbackLogExporter sets the fallback exporter to use when no exporter
// is configured through the OTEL_LOGS_EXPORTER environment variable.
func WithFallbackLogExporter(logExporterFactory func(ctx context.Context) (log.Exporter, error)) LogOption {
return withFallbackFactory[log.Exporter](logExporterFactory)
}
// NewLogExporter returns a configured [go.opentelemetry.io/otel/sdk/log.Exporter]
// defined using the environment variables described below.
//
// OTEL_LOGS_EXPORTER defines the logs exporter; supported values:
// - "none" - "no operation" exporter
// - "otlp" (default) - OTLP exporter; see [go.opentelemetry.io/otel/exporters/otlp/otlplog]
// - "console" - Standard output exporter; see [go.opentelemetry.io/otel/exporters/stdout/stdoutlog]
//
// OTEL_EXPORTER_OTLP_PROTOCOL defines OTLP exporter's transport protocol;
// supported values:
// - "http/protobuf" (default) - protobuf-encoded data over HTTP connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp]
// - "grpc" - gRPC with protobuf-encoded data over HTTP/2 connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc]
//
// OTEL_EXPORTER_OTLP_LOGS_PROTOCOL defines OTLP exporter's transport protocol for the logs signal;
// supported values are the same as OTEL_EXPORTER_OTLP_PROTOCOL.
//
// An error is returned if an environment value is set to an unhandled value.
//
// Use [RegisterLogExporter] to handle more values of OTEL_LOGS_EXPORTER.
//
// Use [WithFallbackLogExporter] option to change the returned exporter
// when OTEL_LOGS_EXPORTER is unset or empty.
//
// Use [IsNoneLogExporter] to check if the returned exporter is a "no operation" exporter.
func NewLogExporter(ctx context.Context, opts ...LogOption) (log.Exporter, error) {
return logsSignal.create(ctx, opts...)
}
// RegisterLogExporter sets the log.Exporter factory to be used when the
// OTEL_LOGS_EXPORTER environment variable contains the exporter name.
// This will panic if name has already been registered.
func RegisterLogExporter(name string, factory func(context.Context) (log.Exporter, error)) {
must(logsSignal.registry.store(name, factory))
}
func init() {
RegisterLogExporter("otlp", func(ctx context.Context) (log.Exporter, error) {
proto := os.Getenv(otelExporterOTLPLogsProtoEnvKey)
if proto == "" {
proto = os.Getenv(otelExporterOTLPProtoEnvKey)
}
// Fallback to default, http/protobuf.
if proto == "" {
proto = "http/protobuf"
}
switch proto {
case "grpc":
return otlploggrpc.New(ctx)
case "http/protobuf":
return otlploghttp.New(ctx)
default:
return nil, errInvalidOTLPProtocol
}
})
RegisterLogExporter("console", func(ctx context.Context) (log.Exporter, error) {
return stdoutlog.New()
})
RegisterLogExporter("none", func(ctx context.Context) (log.Exporter, error) {
return noopLogExporter{}, nil
})
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"os"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
prometheusbridge "go.opentelemetry.io/contrib/bridges/prometheus"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
promexporter "go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
"go.opentelemetry.io/otel/sdk/metric"
)
const otelExporterOTLPMetricsProtoEnvKey = "OTEL_EXPORTER_OTLP_METRICS_PROTOCOL"
// MetricOption applies an autoexport configuration option.
type MetricOption = option[metric.Reader]
// WithFallbackMetricReader sets the fallback exporter to use when no exporter
// is configured through the OTEL_METRICS_EXPORTER environment variable.
func WithFallbackMetricReader(metricReaderFactory func(ctx context.Context) (metric.Reader, error)) MetricOption {
return withFallbackFactory[metric.Reader](metricReaderFactory)
}
// NewMetricReader returns a configured [go.opentelemetry.io/otel/sdk/metric.Reader]
// defined using the environment variables described below.
//
// OTEL_METRICS_EXPORTER defines the metrics exporter; supported values:
// - "none" - "no operation" exporter
// - "otlp" (default) - OTLP exporter; see [go.opentelemetry.io/otel/exporters/otlp/otlpmetric]
// - "prometheus" - Prometheus exporter + HTTP server; see [go.opentelemetry.io/otel/exporters/prometheus]
// - "console" - Standard output exporter; see [go.opentelemetry.io/otel/exporters/stdout/stdoutmetric]
//
// OTEL_EXPORTER_OTLP_PROTOCOL defines OTLP exporter's transport protocol;
// supported values:
// - "grpc" - protobuf-encoded data using gRPC wire format over HTTP/2 connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc]
// - "http/protobuf" (default) - protobuf-encoded data over HTTP connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp]
//
// OTEL_EXPORTER_OTLP_METRICS_PROTOCOL defines OTLP exporter's transport protocol for the metrics signal;
// supported values are the same as OTEL_EXPORTER_OTLP_PROTOCOL.
//
// OTEL_EXPORTER_PROMETHEUS_HOST (defaulting to "localhost") and
// OTEL_EXPORTER_PROMETHEUS_PORT (defaulting to 9464) define the host and port for the
// Prometheus exporter's HTTP server.
//
// Experimental: OTEL_METRICS_PRODUCERS can be used to configure metric producers.
// supported values: prometheus, none. Multiple values can be specified separated by commas.
//
// An error is returned if an environment value is set to an unhandled value.
//
// Use [RegisterMetricReader] to handle more values of OTEL_METRICS_EXPORTER.
// Use [RegisterMetricProducer] to handle more values of OTEL_METRICS_PRODUCERS.
//
// Use [WithFallbackMetricReader] option to change the returned exporter
// when OTEL_METRICS_EXPORTER is unset or empty.
//
// Use [IsNoneMetricReader] to check if the returned exporter is a "no operation" exporter.
func NewMetricReader(ctx context.Context, opts ...MetricOption) (metric.Reader, error) {
return metricsSignal.create(ctx, opts...)
}
// RegisterMetricReader sets the MetricReader factory to be used when the
// OTEL_METRICS_EXPORTERS environment variable contains the exporter name. This
// will panic if name has already been registered.
func RegisterMetricReader(name string, factory func(context.Context) (metric.Reader, error)) {
must(metricsSignal.registry.store(name, factory))
}
// RegisterMetricProducer sets the MetricReader factory to be used when the
// OTEL_METRICS_PRODUCERS environment variable contains the producer name. This
// will panic if name has already been registered.
func RegisterMetricProducer(name string, factory func(context.Context) (metric.Producer, error)) {
must(metricsProducers.registry.store(name, factory))
}
// WithFallbackMetricProducer sets the fallback producer to use when no producer
// is configured through the OTEL_METRICS_PRODUCERS environment variable.
func WithFallbackMetricProducer(producerFactory func(ctx context.Context) (metric.Producer, error)) {
metricsProducers.fallbackProducer = producerFactory
}
var (
metricsSignal = newSignal[metric.Reader]("OTEL_METRICS_EXPORTER")
metricsProducers = newProducerRegistry("OTEL_METRICS_PRODUCERS")
)
func init() {
RegisterMetricReader("otlp", func(ctx context.Context) (metric.Reader, error) {
producers, err := metricsProducers.create(ctx)
if err != nil {
return nil, err
}
readerOpts := []metric.PeriodicReaderOption{}
for _, producer := range producers {
readerOpts = append(readerOpts, metric.WithProducer(producer))
}
proto := os.Getenv(otelExporterOTLPMetricsProtoEnvKey)
if proto == "" {
proto = os.Getenv(otelExporterOTLPProtoEnvKey)
}
// Fallback to default, http/protobuf.
if proto == "" {
proto = "http/protobuf"
}
switch proto {
case "grpc":
r, err := otlpmetricgrpc.New(ctx)
if err != nil {
return nil, err
}
return metric.NewPeriodicReader(r, readerOpts...), nil
case "http/protobuf":
r, err := otlpmetrichttp.New(ctx)
if err != nil {
return nil, err
}
return metric.NewPeriodicReader(r, readerOpts...), nil
default:
return nil, errInvalidOTLPProtocol
}
})
RegisterMetricReader("console", func(ctx context.Context) (metric.Reader, error) {
producers, err := metricsProducers.create(ctx)
if err != nil {
return nil, err
}
readerOpts := []metric.PeriodicReaderOption{}
for _, producer := range producers {
readerOpts = append(readerOpts, metric.WithProducer(producer))
}
r, err := stdoutmetric.New()
if err != nil {
return nil, err
}
return metric.NewPeriodicReader(r, readerOpts...), nil
})
RegisterMetricReader("none", func(ctx context.Context) (metric.Reader, error) {
return newNoopMetricReader(), nil
})
RegisterMetricReader("prometheus", func(ctx context.Context) (metric.Reader, error) {
// create an isolated registry instead of using the global registry --
// the user might not want to mix OTel with non-OTel metrics.
// Those that want to comingle metrics from global registry can use
// OTEL_METRICS_PRODUCERS=prometheus
reg := prometheus.NewRegistry()
exporterOpts := []promexporter.Option{promexporter.WithRegisterer(reg)}
producers, err := metricsProducers.create(ctx)
if err != nil {
return nil, err
}
for _, producer := range producers {
exporterOpts = append(exporterOpts, promexporter.WithProducer(producer))
}
reader, err := promexporter.New(exporterOpts...)
if err != nil {
return nil, err
}
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
server := http.Server{
// Timeouts are necessary to make a server resilient to attacks, but ListenAndServe doesn't set any.
// We use values from this example: https://blog.cloudflare.com/exposing-go-on-the-internet/#:~:text=There%20are%20three%20main%20timeouts
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 120 * time.Second,
Handler: mux,
}
// environment variable names and defaults specified at https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/#prometheus-exporter
host := getenv("OTEL_EXPORTER_PROMETHEUS_HOST", "localhost")
port := getenv("OTEL_EXPORTER_PROMETHEUS_PORT", "9464")
addr := host + ":" + port
lis, err := net.Listen("tcp", addr)
if err != nil {
return nil, errors.Join(
fmt.Errorf("binding address %s for Prometheus exporter: %w", addr, err),
reader.Shutdown(ctx),
)
}
go func() {
if err := server.Serve(lis); err != nil && !errors.Is(err, http.ErrServerClosed) {
otel.Handle(fmt.Errorf("the Prometheus HTTP server exited unexpectedly: %w", err))
}
}()
return readerWithServer{lis.Addr(), reader, &server}, nil
})
RegisterMetricProducer("prometheus", func(ctx context.Context) (metric.Producer, error) {
return prometheusbridge.NewMetricProducer(), nil
})
RegisterMetricProducer("none", func(ctx context.Context) (metric.Producer, error) {
return newNoopMetricProducer(), nil
})
}
type readerWithServer struct {
addr net.Addr
metric.Reader
server *http.Server
}
func (rws readerWithServer) Shutdown(ctx context.Context) error {
return errors.Join(
rws.Reader.Shutdown(ctx),
rws.server.Shutdown(ctx),
)
}
func getenv(key, fallback string) string {
result, ok := os.LookupEnv(key)
if !ok {
return fallback
}
return result
}
type producerRegistry struct {
envKey string
fallbackProducer func(context.Context) (metric.Producer, error)
registry *registry[metric.Producer]
}
func newProducerRegistry(envKey string) producerRegistry {
return producerRegistry{
envKey: envKey,
registry: &registry[metric.Producer]{
names: make(map[string]func(context.Context) (metric.Producer, error)),
},
}
}
func (pr producerRegistry) create(ctx context.Context) ([]metric.Producer, error) {
expType := os.Getenv(pr.envKey)
if expType == "" {
if pr.fallbackProducer != nil {
producer, err := pr.fallbackProducer(ctx)
if err != nil {
return nil, err
}
return []metric.Producer{producer}, nil
}
return nil, nil
}
producers := dedupedMetricProducers(expType)
metricProducers := make([]metric.Producer, 0, len(producers))
for _, producer := range producers {
producer, err := pr.registry.load(ctx, producer)
if err != nil {
return nil, err
}
metricProducers = append(metricProducers, producer)
}
return metricProducers, nil
}
func dedupedMetricProducers(envValue string) []string {
producers := make(map[string]struct{})
for _, producer := range strings.Split(envValue, ",") {
producers[producer] = struct{}{}
}
result := make([]string, 0, len(producers))
for producer := range producers {
result = append(result, producer)
}
return result
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"go.opentelemetry.io/otel/sdk/log"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
"go.opentelemetry.io/otel/sdk/trace"
)
// noopSpanExporter is an implementation of trace.SpanExporter that performs no operations.
type noopSpanExporter struct{}
var _ trace.SpanExporter = noopSpanExporter{}
// ExportSpans is part of trace.SpanExporter interface.
func (e noopSpanExporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan) error {
return nil
}
// Shutdown is part of trace.SpanExporter interface.
func (e noopSpanExporter) Shutdown(ctx context.Context) error {
return nil
}
// IsNoneSpanExporter returns true for the exporter returned by [NewSpanExporter]
// when OTEL_TRACES_EXPORTER environment variable is set to "none".
func IsNoneSpanExporter(e trace.SpanExporter) bool {
_, ok := e.(noopSpanExporter)
return ok
}
type noopMetricReader struct {
*metric.ManualReader
}
func newNoopMetricReader() noopMetricReader {
return noopMetricReader{metric.NewManualReader()}
}
// IsNoneMetricReader returns true for the exporter returned by [NewMetricReader]
// when OTEL_METRICS_EXPORTER environment variable is set to "none".
func IsNoneMetricReader(e metric.Reader) bool {
_, ok := e.(noopMetricReader)
return ok
}
type noopMetricProducer struct{}
func (e noopMetricProducer) Produce(ctx context.Context) ([]metricdata.ScopeMetrics, error) {
return nil, nil
}
func newNoopMetricProducer() noopMetricProducer {
return noopMetricProducer{}
}
// noopLogExporter is an implementation of log.SpanExporter that performs no operations.
type noopLogExporter struct{}
var _ log.Exporter = noopLogExporter{}
// ExportSpans is part of log.Exporter interface.
func (e noopLogExporter) Export(ctx context.Context, records []log.Record) error {
return nil
}
// Shutdown is part of log.Exporter interface.
func (e noopLogExporter) Shutdown(ctx context.Context) error {
return nil
}
// ForceFlush is part of log.Exporter interface.
func (e noopLogExporter) ForceFlush(ctx context.Context) error {
return nil
}
// IsNoneLogExporter returns true for the exporter returned by [NewLogExporter]
// when OTEL_LOGSS_EXPORTER environment variable is set to "none".
func IsNoneLogExporter(e log.Exporter) bool {
_, ok := e.(noopLogExporter)
return ok
}

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vendor/go.opentelemetry.io/contrib/exporters/autoexport/registry.go generated vendored Normal file
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"errors"
"fmt"
"sync"
)
const otelExporterOTLPProtoEnvKey = "OTEL_EXPORTER_OTLP_PROTOCOL"
// registry maintains a map of exporter names to exporter factories
// func(context.Context) (T, error) that is safe for concurrent use by multiple
// goroutines without additional locking or coordination.
type registry[T any] struct {
mu sync.Mutex
names map[string]func(context.Context) (T, error)
}
var (
// errUnknownExporterProducer is returned when an unknown exporter name is used in
// the OTEL_*_EXPORTER or OTEL_METRICS_PRODUCERS environment variables.
errUnknownExporterProducer = errors.New("unknown exporter or metrics producer")
// errInvalidOTLPProtocol is returned when an invalid protocol is used in
// the OTEL_EXPORTER_OTLP_PROTOCOL environment variable.
errInvalidOTLPProtocol = errors.New("invalid OTLP protocol - should be one of ['grpc', 'http/protobuf']")
// errDuplicateRegistration is returned when an duplicate registration is detected.
errDuplicateRegistration = errors.New("duplicate registration")
)
// load returns tries to find the exporter factory with the key and
// then execute the factory, returning the created SpanExporter.
// errUnknownExporterProducer is returned if the registration is missing and the error from
// executing the factory if not nil.
func (r *registry[T]) load(ctx context.Context, key string) (T, error) {
r.mu.Lock()
defer r.mu.Unlock()
factory, ok := r.names[key]
if !ok {
var zero T
return zero, errUnknownExporterProducer
}
return factory(ctx)
}
// store sets the factory for a key if is not already in the registry. errDuplicateRegistration
// is returned if the registry already contains key.
func (r *registry[T]) store(key string, factory func(context.Context) (T, error)) error {
r.mu.Lock()
defer r.mu.Unlock()
if _, ok := r.names[key]; ok {
return fmt.Errorf("%w: %q", errDuplicateRegistration, key)
}
r.names[key] = factory
return nil
}
func must(err error) {
if err != nil {
panic(err)
}
}

61
vendor/go.opentelemetry.io/contrib/exporters/autoexport/signal.go generated vendored Normal file
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"os"
)
type signal[T any] struct {
envKey string
registry *registry[T]
}
func newSignal[T any](envKey string) signal[T] {
return signal[T]{
envKey: envKey,
registry: &registry[T]{
names: make(map[string]func(context.Context) (T, error)),
},
}
}
func (s signal[T]) create(ctx context.Context, opts ...option[T]) (T, error) {
var cfg config[T]
for _, opt := range opts {
opt.apply(&cfg)
}
expType := os.Getenv(s.envKey)
if expType == "" {
if cfg.fallbackFactory != nil {
return cfg.fallbackFactory(ctx)
}
expType = "otlp"
}
return s.registry.load(ctx, expType)
}
type config[T any] struct {
fallbackFactory func(ctx context.Context) (T, error)
}
type option[T any] interface {
apply(cfg *config[T])
}
type optionFunc[T any] func(cfg *config[T])
//lint:ignore U1000 https://github.com/dominikh/go-tools/issues/1440
func (fn optionFunc[T]) apply(cfg *config[T]) {
fn(cfg)
}
func withFallbackFactory[T any](fallbackFactory func(ctx context.Context) (T, error)) option[T] {
return optionFunc[T](func(cfg *config[T]) {
cfg.fallbackFactory = fallbackFactory
})
}

98
vendor/go.opentelemetry.io/contrib/exporters/autoexport/spans.go generated vendored Normal file
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"os"
"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/sdk/trace"
)
const otelExporterOTLPTracesProtoEnvKey = "OTEL_EXPORTER_OTLP_TRACES_PROTOCOL"
// SpanOption applies an autoexport configuration option.
type SpanOption = option[trace.SpanExporter]
// Option applies an autoexport configuration option.
//
// Deprecated: Use SpanOption.
type Option = SpanOption
// WithFallbackSpanExporter sets the fallback exporter to use when no exporter
// is configured through the OTEL_TRACES_EXPORTER environment variable.
func WithFallbackSpanExporter(spanExporterFactory func(ctx context.Context) (trace.SpanExporter, error)) SpanOption {
return withFallbackFactory[trace.SpanExporter](spanExporterFactory)
}
// NewSpanExporter returns a configured [go.opentelemetry.io/otel/sdk/trace.SpanExporter]
// defined using the environment variables described below.
//
// OTEL_TRACES_EXPORTER defines the traces exporter; supported values:
// - "none" - "no operation" exporter
// - "otlp" (default) - OTLP exporter; see [go.opentelemetry.io/otel/exporters/otlp/otlptrace]
// - "console" - Standard output exporter; see [go.opentelemetry.io/otel/exporters/stdout/stdouttrace]
//
// OTEL_EXPORTER_OTLP_PROTOCOL defines OTLP exporter's transport protocol;
// supported values:
// - "grpc" - protobuf-encoded data using gRPC wire format over HTTP/2 connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc]
// - "http/protobuf" (default) - protobuf-encoded data over HTTP connection;
// see: [go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp]
//
// OTEL_EXPORTER_OTLP_TRACES_PROTOCOL defines OTLP exporter's transport protocol for the traces signal;
// supported values are the same as OTEL_EXPORTER_OTLP_PROTOCOL.
//
// An error is returned if an environment value is set to an unhandled value.
//
// Use [RegisterSpanExporter] to handle more values of OTEL_TRACES_EXPORTER.
//
// Use [WithFallbackSpanExporter] option to change the returned exporter
// when OTEL_TRACES_EXPORTER is unset or empty.
//
// Use [IsNoneSpanExporter] to check if the returned exporter is a "no operation" exporter.
func NewSpanExporter(ctx context.Context, opts ...SpanOption) (trace.SpanExporter, error) {
return tracesSignal.create(ctx, opts...)
}
// RegisterSpanExporter sets the SpanExporter factory to be used when the
// OTEL_TRACES_EXPORTER environment variable contains the exporter name. This
// will panic if name has already been registered.
func RegisterSpanExporter(name string, factory func(context.Context) (trace.SpanExporter, error)) {
must(tracesSignal.registry.store(name, factory))
}
var tracesSignal = newSignal[trace.SpanExporter]("OTEL_TRACES_EXPORTER")
func init() {
RegisterSpanExporter("otlp", func(ctx context.Context) (trace.SpanExporter, error) {
proto := os.Getenv(otelExporterOTLPTracesProtoEnvKey)
if proto == "" {
proto = os.Getenv(otelExporterOTLPProtoEnvKey)
}
// Fallback to default, http/protobuf.
if proto == "" {
proto = "http/protobuf"
}
switch proto {
case "grpc":
return otlptracegrpc.New(ctx)
case "http/protobuf":
return otlptracehttp.New(ctx)
default:
return nil, errInvalidOTLPProtocol
}
})
RegisterSpanExporter("console", func(ctx context.Context) (trace.SpanExporter, error) {
return stdouttrace.New()
})
RegisterSpanExporter("none", func(ctx context.Context) (trace.SpanExporter, error) {
return noopSpanExporter{}, nil
})
}