feat: boxo tracing and traceparent support

https://www.w3.org/TR/trace-context/
ipfs-inactive/bifrost-gateway#68

docs/environment-variables.md

@@ -164,74 +164,5 @@ and outputs it to `rcmgr.json.gz`
 Default: disabled (not set)
 
 # Tracing
-For advanced configuration (e.g. ratio-based sampling), see also: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md
 
-## `OTEL_TRACES_EXPORTER`
-Specifies the exporters to use as a comma-separated string. Each exporter has a set of additional environment variables used to configure it. The following values are supported:
-
-- `otlp`
-- `jaeger`
-- `zipkin`
-- `file` -- appends traces to a JSON file on the filesystem
-
-Setting this enables OpenTelemetry tracing.
-
-**NOTE** Tracing support is experimental: releases may contain tracing-related breaking changes.
-
-Default: "" (no exporters)
-
-## `OTLP Exporter`
-Unless specified in this section, the OTLP exporter uses the environment variables documented here: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
-
-### `OTEL_EXPORTER_OTLP_PROTOCOL`
-Specifies the OTLP protocol to use, which is one of:
-
-- `grpc`
-- `http/protobuf`
-
-Default: "grpc"
-
-## `Jaeger Exporter`
-
-See: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#jaeger-exporter
-
-## `Zipkin Exporter`
-See: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#zipkin-exporter
-
-## `File Exporter`
-### `OTEL_EXPORTER_FILE_PATH`
-Specifies the filesystem path for the JSON file.
-
-Default: "$PWD/traces.json"
-
-### How to use Jaeger UI
-
-One can use the `jaegertracing/all-in-one` Docker image to run a full Jaeger
-stack and configure Kubo to publish traces to it (here, in an ephemeral
-container):
-
-```console
-$ docker run --rm -it --name jaeger \
-    -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
-    -p 5775:5775/udp \
-    -p 6831:6831/udp \
-    -p 6832:6832/udp \
-    -p 5778:5778 \
-    -p 16686:16686 \
-    -p 14268:14268 \
-    -p 14269:14269 \
-    -p 14250:14250 \
-    -p 9411:9411 \
-    jaegertracing/all-in-one
-```
-
-Then, in other terminal, start Kubo with Jaeger tracing enabled:
-```
-$ OTEL_TRACES_EXPORTER=jaeger ipfs daemon
-```
-
-Finally, the [Jaeger UI](https://github.com/jaegertracing/jaeger-ui#readme) is available at http://localhost:16686
-
-## `OTEL_PROPAGATORS`
-
-See https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#general-sdk-configuration
+For tracing configuration, please check: https://github.com/ipfs/boxo/blob/main/docs/tracing.md

docs/examples/kubo-as-a-library/go.mod

@@ -7,7 +7,7 @@ go 1.18
 replace github.com/ipfs/kubo => ./../../..
 
 require (
-	github.com/ipfs/boxo v0.8.0
+	github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e
 	github.com/ipfs/kubo v0.0.0-00010101000000-000000000000
 	github.com/libp2p/go-libp2p v0.27.0
 	github.com/multiformats/go-multiaddr v0.9.0

docs/examples/kubo-as-a-library/go.sum

@@ -321,8 +321,8 @@ github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/ipfs/bbloom v0.0.4 h1:Gi+8EGJ2y5qiD5FbsbpX/TMNcJw8gSqr7eyjHa4Fhvs=
 github.com/ipfs/bbloom v0.0.4/go.mod h1:cS9YprKXpoZ9lT0n/Mw/a6/aFV6DTjTLYHeA+gyqMG0=
-github.com/ipfs/boxo v0.8.0 h1:UdjAJmHzQHo/j3g3b1bAcAXCj/GM6iTwvSlBDvPBNBs=
-github.com/ipfs/boxo v0.8.0/go.mod h1:RIsi4CnTyQ7AUsNn5gXljJYZlQrHBMnJp94p73liFiA=
+github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e h1:8wmBhjwJk2drWZjNwoN7uc+IkG+N93laIhjY69rjMqw=
+github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e/go.mod h1:xJ2hVb4La5WyD7GvKYE0lq2g1rmQZoCD2K4WNrV6aZI=
 github.com/ipfs/go-bitfield v1.1.0 h1:fh7FIo8bSwaJEh6DdTWbCeZ1eqOaOkKFI74SCnsWbGA=
 github.com/ipfs/go-bitfield v1.1.0/go.mod h1:paqf1wjq/D2BBmzfTVFlJQ9IlFOZpg422HL0HqsGWHU=
 github.com/ipfs/go-block-format v0.0.2/go.mod h1:AWR46JfpcObNfg3ok2JHDUfdiHRgWhJgCQF+KIgOPJY=

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/gogo/protobuf v1.3.2
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-multierror v1.1.1
-	github.com/ipfs/boxo v0.8.0
+	github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e
 	github.com/ipfs/go-block-format v0.1.2
 	github.com/ipfs/go-cid v0.4.1
 	github.com/ipfs/go-cidutil v0.1.0
@@ -75,11 +75,6 @@ require (
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.40.0
 	go.opentelemetry.io/contrib/propagators/autoprop v0.40.0
 	go.opentelemetry.io/otel v1.14.0
-	go.opentelemetry.io/otel/exporters/jaeger v1.14.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.14.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.14.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.14.0
-	go.opentelemetry.io/otel/exporters/zipkin v1.14.0
 	go.opentelemetry.io/otel/sdk v1.14.0
 	go.opentelemetry.io/otel/trace v1.14.0
 	go.uber.org/dig v1.16.1
@@ -208,8 +203,13 @@ require (
 	go.opentelemetry.io/contrib/propagators/b3 v1.15.0 // indirect
 	go.opentelemetry.io/contrib/propagators/jaeger v1.15.0 // indirect
 	go.opentelemetry.io/contrib/propagators/ot v1.15.0 // indirect
+	go.opentelemetry.io/otel/exporters/jaeger v1.14.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.14.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/zipkin v1.14.0 // indirect
 	go.opentelemetry.io/otel/metric v0.37.0 // indirect
 	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
 	go.uber.org/atomic v1.10.0 // indirect

go.sum

@@ -356,8 +356,8 @@ github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/ipfs/bbloom v0.0.4 h1:Gi+8EGJ2y5qiD5FbsbpX/TMNcJw8gSqr7eyjHa4Fhvs=
 github.com/ipfs/bbloom v0.0.4/go.mod h1:cS9YprKXpoZ9lT0n/Mw/a6/aFV6DTjTLYHeA+gyqMG0=
-github.com/ipfs/boxo v0.8.0 h1:UdjAJmHzQHo/j3g3b1bAcAXCj/GM6iTwvSlBDvPBNBs=
-github.com/ipfs/boxo v0.8.0/go.mod h1:RIsi4CnTyQ7AUsNn5gXljJYZlQrHBMnJp94p73liFiA=
+github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e h1:8wmBhjwJk2drWZjNwoN7uc+IkG+N93laIhjY69rjMqw=
+github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e/go.mod h1:xJ2hVb4La5WyD7GvKYE0lq2g1rmQZoCD2K4WNrV6aZI=
 github.com/ipfs/go-bitfield v1.1.0 h1:fh7FIo8bSwaJEh6DdTWbCeZ1eqOaOkKFI74SCnsWbGA=
 github.com/ipfs/go-bitfield v1.1.0/go.mod h1:paqf1wjq/D2BBmzfTVFlJQ9IlFOZpg422HL0HqsGWHU=
 github.com/ipfs/go-block-format v0.0.2/go.mod h1:AWR46JfpcObNfg3ok2JHDUfdiHRgWhJgCQF+KIgOPJY=

tracing/tracing.go

@@ -3,16 +3,10 @@ package tracing
 import (
 	"context"
 	"fmt"
-	"os"
-	"path"
-	"strings"
 
+	"github.com/ipfs/boxo/tracing"
 	version "github.com/ipfs/kubo"
 	"go.opentelemetry.io/otel"
-	"go.opentelemetry.io/otel/exporters/jaeger"
-	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
-	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
-	"go.opentelemetry.io/otel/exporters/zipkin"
 	"go.opentelemetry.io/otel/sdk/resource"
 	"go.opentelemetry.io/otel/sdk/trace"
 	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
@@ -33,87 +27,9 @@ type noopShutdownTracerProvider struct{ traceapi.TracerProvider }
 
 func (n *noopShutdownTracerProvider) Shutdown(ctx context.Context) error { return nil }
 
-func buildExporters(ctx context.Context) ([]trace.SpanExporter, error) {
-	// These env vars are standardized but not yet supported by opentelemetry-go.
-	// Once supported, we can remove most of this code.
-	//
-	// Specs:
-	// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#exporter-selection
-	// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
-	var exporters []trace.SpanExporter
-	for _, exporterStr := range strings.Split(os.Getenv("OTEL_TRACES_EXPORTER"), ",") {
-		switch exporterStr {
-		case "otlp":
-			protocol := "http/protobuf"
-			if v := os.Getenv("OTEL_EXPORTER_OTLP_PROTOCOL"); v != "" {
-				protocol = v
-			}
-			if v := os.Getenv("OTEL_EXPORTER_OTLP_TRACES_PROTOCOL"); v != "" {
-				protocol = v
-			}
-
-			switch protocol {
-			case "http/protobuf":
-				exporter, err := otlptracehttp.New(ctx)
-				if err != nil {
-					return nil, fmt.Errorf("building OTLP HTTP exporter: %w", err)
-				}
-				exporters = append(exporters, exporter)
-			case "grpc":
-				exporter, err := otlptracegrpc.New(ctx)
-				if err != nil {
-					return nil, fmt.Errorf("building OTLP gRPC exporter: %w", err)
-				}
-				exporters = append(exporters, exporter)
-			default:
-				return nil, fmt.Errorf("unknown or unsupported OTLP exporter '%s'", exporterStr)
-			}
-		case "jaeger":
-			exporter, err := jaeger.New(jaeger.WithCollectorEndpoint())
-			if err != nil {
-				return nil, fmt.Errorf("building Jaeger exporter: %w", err)
-			}
-			exporters = append(exporters, exporter)
-		case "zipkin":
-			exporter, err := zipkin.New("")
-			if err != nil {
-				return nil, fmt.Errorf("building Zipkin exporter: %w", err)
-			}
-			exporters = append(exporters, exporter)
-		case "file":
-			// This is not part of the spec, but provided for convenience
-			// so that you don't have to setup a collector,
-			// and because we don't support the stdout exporter.
-			filePath := os.Getenv("OTEL_EXPORTER_FILE_PATH")
-			if filePath == "" {
-				cwd, err := os.Getwd()
-				if err != nil {
-					return nil, fmt.Errorf("finding working directory for the OpenTelemetry file exporter: %w", err)
-				}
-				filePath = path.Join(cwd, "traces.json")
-			}
-			exporter, err := newFileExporter(filePath)
-			if err != nil {
-				return nil, err
-			}
-			exporters = append(exporters, exporter)
-		case "none":
-			continue
-		case "":
-			continue
-		case "stdout":
-			// stdout is already used for certain kinds of logging, so we don't support this
-			fallthrough
-		default:
-			return nil, fmt.Errorf("unknown or unsupported exporter '%s'", exporterStr)
-		}
-	}
-	return exporters, nil
-}
-
 // NewTracerProvider creates and configures a TracerProvider.
 func NewTracerProvider(ctx context.Context) (shutdownTracerProvider, error) {
-	exporters, err := buildExporters(ctx)
+	exporters, err := tracing.NewSpanExporters(ctx)
 	if err != nil {
 		return nil, err
 	}