Use less goroutines in validator runner (prysmaticlabs#5328)

* Add buildbuddy BES (prysmaticlabs#5325)

* Add buildbuddy BES
* Use less goroutines when running validator
* per-role based goroutines
* Merge branch 'master' into validator-issue-4702

validator/client/runner.go

@@ -101,24 +101,24 @@ func run(ctx context.Context, v Validator) {
 				continue
 			}
 			for id, roles := range allRoles {
-				wg.Add(1)
-				go func(roles []validatorRole, id [48]byte) {
-					for _, role := range roles {
+				wg.Add(len(roles))
+				for _, role := range roles {
+					go func(role validatorRole, id [48]byte) {
+						defer wg.Done()
 						switch role {
 						case roleAttester:
-							go v.SubmitAttestation(slotCtx, slot, id)
+							v.SubmitAttestation(slotCtx, slot, id)
 						case roleProposer:
-							go v.ProposeBlock(slotCtx, slot, id)
+							v.ProposeBlock(slotCtx, slot, id)
 						case roleAggregator:
-							go v.SubmitAggregateAndProof(slotCtx, slot, id)
+							v.SubmitAggregateAndProof(slotCtx, slot, id)
 						case roleUnknown:
 							log.WithField("pubKey", fmt.Sprintf("%#x", bytesutil.Trunc(id[:]))).Trace("No active roles, doing nothing")
 						default:
 							log.Warnf("Unhandled role %v", role)
 						}
-					}
-					wg.Done()
-				}(roles, id)
+					}(role, id)
+				}
 			}
 			// Wait for all processes to complete, then report span complete.
 			go func() {