feat: trace context traceparent header support

Context:
https://www.w3.org/TR/trace-context/
#68

README.md

@@ -141,6 +141,10 @@ Caveats:
   - Learn more at [Project Rhea (decentralized IPFS gateway)](https://pl-strflt.notion.site/Project-Rhea-decentralized-IPFS-gateway-3d5906e7a0d84bea800d5920005dfea6)
 - Functional gaps facilitated by temporary delegation to legacy Kubo RPC (`/api/v0`) at `https://node[0-3].delegate.ipfs.io` infra (already used by js-ipfs).
 
+### How to use tracing?
+
+For tracing configuration, please check: https://github.com/ipfs/boxo/blob/main/docs/tracing.md - this includes
+how to generate a `traceparent` header in order to be able to easily identify specific requests.
 
 ## Contributing
 

blockstore_caboose.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/filecoin-saturn/caboose"
 	blockstore "github.com/ipfs/boxo/blockstore"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 const (
@@ -61,7 +62,7 @@ func newCabooseBlockStore(orchestrator, loggingEndpoint string, cdns *cachedDNS)
 
 	saturnRetrievalClient := &http.Client{
 		Timeout: caboose.DefaultSaturnCarRequestTimeout,
-		Transport: &customTransport{
+		Transport: otelhttp.NewTransport(&customTransport{
 			RoundTripper: &http.Transport{
 				// Increasing concurrency defaults from http.DefaultTransport
 				MaxIdleConns:        1000,
@@ -84,7 +85,7 @@ func newCabooseBlockStore(orchestrator, loggingEndpoint string, cdns *cachedDNS)
 					// ServerName:         "strn.pl",
 				},
 			},
-		},
+		}),
 	}
 
 	return caboose.NewCaboose(&caboose.Config{

blockstore_proxy.go

@@ -7,13 +7,13 @@ import (
 	"log"
 	"math/rand"
 	"net/http"
-	"net/url"
 	"time"
 
 	"github.com/ipfs/bifrost-gateway/lib"
 	blockstore "github.com/ipfs/boxo/blockstore"
 	blocks "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-cid"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 // Blockstore backed by a verifiable gateway. This is vendor-agnostic proxy interface,
@@ -37,18 +37,14 @@ type proxyBlockStore struct {
 }
 
 func (ps *proxyBlockStore) Fetch(ctx context.Context, path string, cb lib.DataCallback) error {
-	u, err := url.Parse(fmt.Sprintf("%s%s", ps.getRandomGatewayURL(), path))
+	urlStr := fmt.Sprintf("%s%s", ps.getRandomGatewayURL(), path)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, urlStr, nil)
 	if err != nil {
 		return err
 	}
-	goLog.Debugw("car fetch", "url", u)
-	resp, err := ps.httpClient.Do(&http.Request{
-		Method: http.MethodGet,
-		URL:    u,
-		Header: http.Header{
-			"Accept": []string{"application/vnd.ipld.car"},
-		},
-	})
+	goLog.Debugw("car fetch", "url", req.URL)
+	req.Header.Set("Accept", "application/vnd.ipld.car")
+	resp, err := ps.httpClient.Do(req)
 	if err != nil {
 		return err
 	}
@@ -79,7 +75,7 @@ func newProxyBlockStore(gatewayURL []string, cdns *cachedDNS) blockstore.Blockst
 		gatewayURL: gatewayURL,
 		httpClient: &http.Client{
 			Timeout: GetBlockTimeout,
-			Transport: &customTransport{
+			Transport: otelhttp.NewTransport(&customTransport{
 				// Roundtripper with increased defaults than http.Transport such that retrieving
 				// multiple blocks from a single gateway concurrently is fast.
 				RoundTripper: &http.Transport{
@@ -89,7 +85,7 @@ func newProxyBlockStore(gatewayURL []string, cdns *cachedDNS) blockstore.Blockst
 					IdleConnTimeout:     90 * time.Second,
 					DialContext:         cdns.dialWithCachedDNS,
 				},
-			},
+			}),
 		},
 		// Enables block validation by default. Important since we are
 		// proxying block requests to an untrusted gateway.
@@ -99,18 +95,14 @@ func newProxyBlockStore(gatewayURL []string, cdns *cachedDNS) blockstore.Blockst
 }
 
 func (ps *proxyBlockStore) fetch(ctx context.Context, c cid.Cid) (blocks.Block, error) {
-	u, err := url.Parse(fmt.Sprintf("%s/ipfs/%s?format=raw", ps.getRandomGatewayURL(), c))
+	urlStr := fmt.Sprintf("%s/ipfs/%s?format=raw", ps.getRandomGatewayURL(), c)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, urlStr, nil)
 	if err != nil {
 		return nil, err
 	}
-	goLog.Debugw("raw fetch", "url", u)
-	resp, err := ps.httpClient.Do(&http.Request{
-		Method: http.MethodGet,
-		URL:    u,
-		Header: http.Header{
-			"Accept": []string{"application/vnd.ipld.raw"},
-		},
-	})
+	goLog.Debugw("raw fetch", "url", req.URL)
+	req.Header.Set("Accept", "application/vnd.ipld.raw")
+	resp, err := ps.httpClient.Do(req)
 	if err != nil {
 		return nil, err
 	}

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/filecoin-saturn/caboose v0.0.0-20230407094233-65275d010784
 	github.com/gogo/protobuf v1.3.2
 	github.com/hashicorp/golang-lru/v2 v2.0.1
-	github.com/ipfs/boxo v0.8.1-0.20230406132331-999d939e84a0
+	github.com/ipfs/boxo v0.8.1-0.20230411232920-5d6c73c8e35e
 	github.com/ipfs/go-block-format v0.1.2
 	github.com/ipfs/go-cid v0.4.0
 	github.com/ipfs/go-ipld-format v0.4.0
@@ -25,6 +25,11 @@ require (
 	github.com/rs/dnscache v0.0.0-20211102005908-e0241e321417
 	github.com/spf13/cobra v1.6.1
 	github.com/stretchr/testify v1.8.2
+	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/sdk v1.14.0
+	go.opentelemetry.io/otel/trace v1.14.0
 	go.uber.org/atomic v1.10.0
 	go.uber.org/multierr v1.9.0
 	go.uber.org/zap v1.24.0
@@ -34,6 +39,7 @@ require (
 	github.com/alecthomas/units v0.0.0-20210927113745-59d0afb8317a // indirect
 	github.com/benbjohnson/clock v1.3.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.0 // indirect
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/containerd/cgroups v1.0.4 // indirect
@@ -45,7 +51,7 @@ require (
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/dustin/go-humanize v1.0.0 // indirect
 	github.com/elastic/gosigar v0.14.2 // indirect
-	github.com/felixge/httpsnoop v1.0.0 // indirect
+	github.com/felixge/httpsnoop v1.0.3 // indirect
 	github.com/flynn/noise v1.0.0 // indirect
 	github.com/francoispqt/gojay v1.2.13 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.1 // indirect
@@ -59,6 +65,7 @@ require (
 	github.com/google/gopacket v1.1.19 // indirect
 	github.com/google/pprof v0.0.0-20221203041831-ce31453925ec // indirect
 	github.com/google/uuid v1.3.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.7.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
@@ -113,6 +120,7 @@ require (
 	github.com/onsi/ginkgo/v2 v2.5.1 // indirect
 	github.com/opencontainers/runtime-spec v1.0.3-0.20211123151946-c2389c3cb60a // indirect
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
+	github.com/openzipkin/zipkin-go v0.4.1 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/petar/GoLLRB v0.0.0-20210522233825-ae3b015fd3e9 // indirect
@@ -138,8 +146,19 @@ require (
 	github.com/whyrusleeping/cbor-gen v0.0.0-20230126041949-52956bd4c9aa // indirect
 	github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	go.opentelemetry.io/otel v1.14.0 // indirect
-	go.opentelemetry.io/otel/trace v1.14.0 // indirect
+	go.opentelemetry.io/contrib/propagators/aws v1.15.0 // indirect
+	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/dig v1.15.0 // indirect
 	go.uber.org/fx v1.18.2 // indirect
 	golang.org/x/crypto v0.6.0 // indirect
@@ -151,6 +170,8 @@ require (
 	golang.org/x/text v0.7.0 // indirect
 	golang.org/x/tools v0.5.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
+	google.golang.org/genproto v0.0.0-20230110181048-76db0878b65f // indirect
+	google.golang.org/grpc v1.53.0 // indirect
 	google.golang.org/protobuf v1.28.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/blake3 v1.1.7 // indirect