swarm: integrate OpenTracing; propagate ctx to internal APIs (#17169)

* swarm: propagate ctx, enable opentracing

* swarm/tracing: log error when tracing is misconfigured

swarm/pss/pss.go

@@ -18,6 +18,7 @@ package pss
 
 import (
 	"bytes"
+	"context"
 	"crypto/ecdsa"
 	"crypto/rand"
 	"errors"
@@ -71,7 +72,7 @@ type senderPeer interface {
 	Info() *p2p.PeerInfo
 	ID() discover.NodeID
 	Address() []byte
-	Send(interface{}) error
+	Send(context.Context, interface{}) error
 }
 
 // per-key peer related information
@@ -344,7 +345,7 @@ func (p *Pss) getHandlers(topic Topic) map[*Handler]bool {
 // Check if address partially matches
 // If yes, it CAN be for us, and we process it
 // Only passes error to pss protocol handler if payload is not valid pssmsg
-func (p *Pss) handlePssMsg(msg interface{}) error {
+func (p *Pss) handlePssMsg(ctx context.Context, msg interface{}) error {
 	metrics.GetOrRegisterCounter("pss.handlepssmsg", nil).Inc(1)
 
 	pssmsg, ok := msg.(*PssMsg)
@@ -844,7 +845,7 @@ func (p *Pss) forward(msg *PssMsg) error {
 		p.fwdPoolMu.RUnlock()
 
 		// attempt to send the message
-		err := pp.Send(msg)
+		err := pp.Send(context.TODO(), msg)
 		if err != nil {
 			metrics.GetOrRegisterCounter("pss.pp.send.error", nil).Inc(1)
 			log.Error(err.Error())