feat: add basic OT tracing for incoming requests

Closes: #271

Author: rvagg

go.mod

@@ -37,6 +37,9 @@ require (
 	github.com/multiformats/go-multihash v0.0.15
 	github.com/stretchr/testify v1.7.0
 	github.com/whyrusleeping/cbor-gen v0.0.0-20210219115102-f37d292932f2
+	go.opentelemetry.io/otel v1.2.0
+	go.opentelemetry.io/otel/sdk v1.2.0
+	go.opentelemetry.io/otel/trace v1.2.0
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	google.golang.org/protobuf v1.27.1

go.sum

@@ -255,8 +255,9 @@ github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -1116,6 +1117,12 @@ go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go.opentelemetry.io/otel v1.2.0 h1:YOQDvxO1FayUcT9MIhJhgMyNO1WqoduiyvQHzGN0kUQ=
+go.opentelemetry.io/otel v1.2.0/go.mod h1:aT17Fk0Z1Nor9e0uisf98LrntPGMnk4frBO9+dkf69I=
+go.opentelemetry.io/otel/sdk v1.2.0 h1:wKN260u4DesJYhyjxDa7LRFkuhH7ncEVKU37LWcyNIo=
+go.opentelemetry.io/otel/sdk v1.2.0/go.mod h1:jNN8QtpvbsKhgaC6V5lHiejMoKD+V8uadoSafgHPx1U=
+go.opentelemetry.io/otel/trace v1.2.0 h1:Ys3iqbqZhcf28hHzrm5WAquMkDHNZTUkw7KHbuNjej0=
+go.opentelemetry.io/otel/trace v1.2.0/go.mod h1:N5FLswTubnxKxOJHM7XZC074qpeEdLy3CgAVsdMucK0=
 go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
@@ -1353,6 +1360,7 @@ golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210317225723-c4fcb01b228e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210426080607-c94f62235c83/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210511113859-b0526f3d8744/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

impl/graphsync.go

@@ -8,6 +8,9 @@ import (
 	"github.com/ipfs/go-peertaskqueue"
 	ipld "github.com/ipld/go-ipld-prime"
 	"github.com/libp2p/go-libp2p-core/peer"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/ipfs/go-graphsync"
 	"github.com/ipfs/go-graphsync/allocator"
@@ -304,6 +307,15 @@ func New(parent context.Context, network gsnet.GraphSyncNetwork,
 
 // Request initiates a new GraphSync request to the given peer using the given selector spec.
 func (gs *GraphSync) Request(ctx context.Context, p peer.ID, root ipld.Link, selector ipld.Node, extensions ...graphsync.ExtensionData) (<-chan graphsync.ResponseProgress, <-chan error) {
+	var extNames []string
+	for _, ext := range extensions {
+		extNames = append(extNames, string(ext.Name))
+	}
+	ctx, _ = otel.Tracer("graphsync").Start(ctx, "request", trace.WithAttributes(
+		attribute.String("peerID", p.Pretty()),
+		attribute.String("root", root.String()),
+		attribute.StringSlice("extensions", extNames),
+	))
 	return gs.requestManager.NewRequest(ctx, p, root, selector, extensions...)
 }