Add cmd option to disable cardinality calc

api.go

@@ -62,7 +62,8 @@ type API struct {
 	importWorkerPoolSize int
 	importWork           chan importJob
 
-	usageCache *usageCache
+	usageCache      *usageCache
+	schemaDetailsOn bool
 
 	Serializer Serializer
 }
@@ -84,6 +85,14 @@ func OptAPIServer(s *Server) apiOption {
 	}
 }
 
+// Used to configure API option: schemaDetailsOn
+func OptAPISchemaDetailsOn(isOn bool) apiOption {
+	return func(a *API) error {
+		a.schemaDetailsOn = isOn
+		return nil
+	}
+}
+
 func OptAPIImportWorkerPoolSize(size int) apiOption {
 	return func(a *API) error {
 		a.importWorkerPoolSize = size
@@ -1237,7 +1246,8 @@ func (api *API) Schema(ctx context.Context, withViews bool) ([]*IndexInfo, error
 }
 
 // SchemaDetails returns information about each index in Pilosa including which
-// fields they contain, and additional field information such as cardinality
+// fields they contain. Additional field information such as cardinality unless
+// turned off via the schemaDetailsOn cli option.
 func (api *API) SchemaDetails(ctx context.Context) ([]*IndexInfo, error) {
 	span, _ := tracing.StartSpanFromContext(ctx, "API.Schema")
 	defer span.Finish()
@@ -1245,6 +1255,9 @@ func (api *API) SchemaDetails(ctx context.Context) ([]*IndexInfo, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "getting schema")
 	}
+	if !api.schemaDetailsOn {
+		return schema, nil
+	}
 	for _, index := range schema {
 		for _, field := range index.Fields {
 			q := fmt.Sprintf("Count(Distinct(field=%s))", field.Name)

ctl/server.go

@@ -118,4 +118,7 @@ func BuildServerFlags(cmd *cobra.Command, srv *server.Command) {
 
 	// Future flags.
 	flags.BoolVar(&srv.Config.Future.Rename, "future.rename", false, "Present application name as FeatureBase. Defaults to false, will default to true in an upcoming release.")
+
+	// Toggle /schema/details endpoint.
+	flags.BoolVar(&srv.Config.SchemaDetailsOn, "schema-details-on", true, "Disable /schema/details endpoint")
 }

server/config.go

@@ -237,6 +237,9 @@ type Config struct {
 		// as FeatureBase instead of Pilosa.
 		Rename bool `toml:"rename"`
 	} `toml:"future"`
+
+	// Toggles /schema/details endpoint. If off, it returns empty.
+	SchemaDetailsOn bool `toml:"schema-details-on"`
 }
 
 // Namespace returns the namespace to use based on the Future flag.
@@ -386,6 +389,9 @@ func NewConfig() *Config {
 	// Future flags.
 	c.Future.Rename = false
 
+	// Schema Details Toggle
+	c.SchemaDetailsOn = true
+
 	return c
 }
 

server/server.go

@@ -511,6 +511,7 @@ func (m *Command) SetupServer() error {
 	m.API, err = pilosa.NewAPI(
 		pilosa.OptAPIServer(m.Server),
 		pilosa.OptAPIImportWorkerPoolSize(m.Config.ImportWorkerPoolSize),
+		pilosa.OptAPISchemaDetailsOn(m.Config.SchemaDetailsOn),
 	)
 	if err != nil {
 		return errors.Wrap(err, "new api")