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

* swarm: propagate ctx, enable opentracing

* swarm/tracing: log error when tracing is misconfigured

cmd/swarm/main.go

@@ -43,6 +43,7 @@ import (
 	"github.com/ethereum/go-ethereum/swarm"
 	bzzapi "github.com/ethereum/go-ethereum/swarm/api"
 	swarmmetrics "github.com/ethereum/go-ethereum/swarm/metrics"
+	"github.com/ethereum/go-ethereum/swarm/tracing"
 
 	"gopkg.in/urfave/cli.v1"
 )
@@ -430,12 +431,14 @@ pv(1) tool to get a progress bar:
 	app.Flags = append(app.Flags, rpcFlags...)
 	app.Flags = append(app.Flags, debug.Flags...)
 	app.Flags = append(app.Flags, swarmmetrics.Flags...)
+	app.Flags = append(app.Flags, tracing.Flags...)
 	app.Before = func(ctx *cli.Context) error {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 		if err := debug.Setup(ctx, ""); err != nil {
 			return err
 		}
 		swarmmetrics.Setup(ctx)
+		tracing.Setup(ctx)
 		return nil
 	}
 	app.After = func(ctx *cli.Context) error {

cmd/swarm/swarm-smoke/upload_and_sync.go

@@ -77,8 +77,9 @@ func cliUploadAndSync(c *cli.Context) error {
 	log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fhash))
 
 	if filesize < 10 {
-		time.Sleep(15 * time.Second)
+		time.Sleep(35 * time.Second)
 	} else {
+		time.Sleep(15 * time.Second)
 		time.Sleep(2 * time.Duration(filesize) * time.Second)
 	}
 
@@ -108,7 +109,7 @@ func cliUploadAndSync(c *cli.Context) error {
 // fetch is getting the requested `hash` from the `endpoint` and compares it with the `original` file
 func fetch(hash string, endpoint string, original []byte, ruid string) error {
 	log.Trace("sleeping", "ruid", ruid)
-	time.Sleep(1 * time.Second)
+	time.Sleep(5 * time.Second)
 
 	log.Trace("http get request", "ruid", ruid, "api", endpoint, "hash", hash)
 	res, err := http.Get(endpoint + "/bzz:/" + hash + "/")