Fix for fetcher warning at server startup

stored_requests/config/config.go

@@ -166,6 +166,9 @@ func newFetcher(cfg *config.StoredRequests, client *http.Client, db *sql.DB) (fe
 	if cfg.Postgres.FetcherQueries.QueryTemplate != "" {
 		glog.Infof("Loading Stored %s data via Postgres.\nQuery: %s", cfg.DataType(), cfg.Postgres.FetcherQueries.QueryTemplate)
 		idList = append(idList, db_fetcher.NewFetcher(db, cfg.Postgres.FetcherQueries.MakeQuery))
+	} else if cfg.Postgres.CacheInitialization.Query != "" && cfg.Postgres.PollUpdates.Query != "" {
+		//in this case data will be loaded to cache via poll for updates event
+		idList = append(idList, empty_fetcher.EmptyFetcher{})
 	}
 	if cfg.HTTP.Endpoint != "" {
 		glog.Infof("Loading Stored %s data via HTTP. endpoint=%s", cfg.DataType(), cfg.HTTP.Endpoint)

stored_requests/config/config_test.go

@@ -41,12 +41,42 @@ func isMemoryCacheType(cache stored_requests.CacheJSON) bool {
 }
 
 func TestNewEmptyFetcher(t *testing.T) {
-	fetcher := newFetcher(&config.StoredRequests{}, nil, nil)
-	if fetcher == nil {
-		t.Errorf("The fetcher should be non-nil, even with an empty config.")
+
+	type testCase struct {
+		config  *config.StoredRequests
+		message string
+	}
+	testCases := []testCase{
+		{
+			config:  &config.StoredRequests{},
+			message: "If the config is empty, and EmptyFetcher should be returned",
+		},
+		{
+			config: &config.StoredRequests{
+				Postgres: config.PostgresConfig{
+					CacheInitialization: config.PostgresCacheInitializer{
+						Query: "test query",
+					},
+					PollUpdates: config.PostgresUpdatePolling{
+						Query: "test poll query",
+					},
+					FetcherQueries: config.PostgresFetcherQueries{
+						QueryTemplate: "",
+					},
+				},
+			},
+			message: "If Postgres fetcher query is not defined, but Postgres Cache init query and Postgres update polling query are defined EmptyFetcher should be returned",
+		},
 	}
-	if _, ok := fetcher.(empty_fetcher.EmptyFetcher); !ok {
-		t.Errorf("If the config is empty, and EmptyFetcher should be returned")
+
+	for _, test := range testCases {
+		fetcher := newFetcher(test.config, nil, nil)
+		if fetcher == nil {
+			t.Errorf("The fetcher should be non-nil.")
+		}
+		if _, ok := fetcher.(empty_fetcher.EmptyFetcher); !ok {
+			t.Errorf(test.message)
+		}
 	}
 }