Run builder even if cannot connect to remote relay (ethereum#12)

Author: Ruteri

builder/relay.go

@@ -44,7 +44,7 @@ type RemoteRelay struct {
 	validatorSlotMap     map[uint64]ValidatorData
 }
 
-func NewRemoteRelay(endpoint string, localRelay *LocalRelay) (*RemoteRelay, error) {
+func NewRemoteRelay(endpoint string, localRelay *LocalRelay) *RemoteRelay {
 	r := &RemoteRelay{
 		endpoint:             endpoint,
 		client:               http.Client{Timeout: time.Second},
@@ -55,7 +55,10 @@ func NewRemoteRelay(endpoint string, localRelay *LocalRelay) (*RemoteRelay, erro
 	}
 
 	err := r.updateValidatorsMap(0, 3)
-	return r, err
+	if err != nil {
+		log.Error("could not connect to remote relay, continuing anyway", "err", err)
+	}
+	return r
 }
 
 type GetValidatorRelayResponse []struct {

builder/relay_test.go

@@ -45,8 +45,7 @@ func TestRemoteRelay(t *testing.T) {
 	}
 
 	srv := httptest.NewServer(r)
-	relay, err := NewRemoteRelay(srv.URL, nil)
-	require.NoError(t, err)
+	relay := NewRemoteRelay(srv.URL, nil)
 	vd, found := relay.validatorSlotMap[123]
 	require.True(t, found)
 	expectedValidator_123 := ValidatorData{
@@ -57,7 +56,7 @@ func TestRemoteRelay(t *testing.T) {
 	}
 	require.Equal(t, expectedValidator_123, vd)
 
-	vd, err = relay.GetValidatorForSlot(123)
+	vd, err := relay.GetValidatorForSlot(123)
 	require.NoError(t, err)
 	require.Equal(t, expectedValidator_123, vd)
 

builder/service.go

@@ -114,10 +114,7 @@ func Register(stack *node.Node, backend *eth.Ethereum, cfg *BuilderConfig) error
 
 	var relay IRelay
 	if cfg.RemoteRelayEndpoint != "" {
-		relay, err = NewRemoteRelay(cfg.RemoteRelayEndpoint, localRelay)
-		if err != nil {
-			return err
-		}
+		relay = NewRemoteRelay(cfg.RemoteRelayEndpoint, localRelay)
 	} else {
 		relay = localRelay
 	}