nil checks in disperser v2 server constructor

disperser/apiserver/server_v2.go

@@ -74,7 +74,35 @@ func NewDispersalServerV2(
 	onchainStateRefreshInterval time.Duration,
 	_logger logging.Logger,
 	registry *prometheus.Registry,
-) *DispersalServerV2 {
+) (*DispersalServerV2, error) {
+	if serverConfig.GrpcPort == "" {
+		return nil, errors.New("grpc port is required")
+	}
+	if blobStore == nil {
+		return nil, errors.New("blob store is required")
+	}
+	if blobMetadataStore == nil {
+		return nil, errors.New("blob metadata store is required")
+	}
+	if chainReader == nil {
+		return nil, errors.New("chain reader is required")
+	}
+	if meterer == nil {
+		return nil, errors.New("meterer is required")
+	}
+	if authenticator == nil {
+		return nil, errors.New("authenticator is required")
+	}
+	if prover == nil {
+		return nil, errors.New("prover is required")
+	}
+	if maxNumSymbolsPerBlob == 0 {
+		return nil, errors.New("maxNumSymbolsPerBlob is required")
+	}
+	if _logger == nil {
+		return nil, errors.New("logger is required")
+	}
+
 	logger := _logger.With("component", "DispersalServerV2")
 
 	return &DispersalServerV2{
@@ -92,7 +120,7 @@ func NewDispersalServerV2(
 		onchainStateRefreshInterval: onchainStateRefreshInterval,
 
 		metrics: newAPIServerV2Metrics(registry),
-	}
+	}, nil
 }
 
 func (s *DispersalServerV2) Start(ctx context.Context) error {

disperser/apiserver/server_v2_test.go

@@ -497,7 +497,7 @@ func newTestServerV2(t *testing.T) *testComponents {
 		},
 	}, nil)
 
-	s := apiserver.NewDispersalServerV2(
+	s, err := apiserver.NewDispersalServerV2(
 		disperser.ServerConfig{
 			GrpcPort:    "51002",
 			GrpcTimeout: 1 * time.Second,
@@ -512,6 +512,7 @@ func newTestServerV2(t *testing.T) *testComponents {
 		time.Hour,
 		logger,
 		prometheus.NewRegistry())
+	assert.NoError(t, err)
 
 	err = s.RefreshOnchainState(context.Background())
 	assert.NoError(t, err)

disperser/cmd/apiserver/main.go

@@ -170,7 +170,7 @@ func RunDisperserServer(ctx *cli.Context) error {
 		blobMetadataStore := blobstorev2.NewBlobMetadataStore(dynamoClient, logger, config.BlobstoreConfig.TableName)
 		blobStore := blobstorev2.NewBlobStore(bucketName, s3Client, logger)
 
-		server := apiserver.NewDispersalServerV2(
+		server, err := apiserver.NewDispersalServerV2(
 			config.ServerConfig,
 			blobStore,
 			blobMetadataStore,
@@ -183,6 +183,9 @@ func RunDisperserServer(ctx *cli.Context) error {
 			logger,
 			reg,
 		)
+		if err != nil {
+			return err
+		}
 		return server.Start(context.Background())
 	}