Method lazyLoadSchema

graphql/admin/admin.go:1009–1045

(namespace uint64)

}

func (as *adminServer) lazyLoadSchema(namespace uint64) error {
	// if the schema is already in memory, no need to fetch it from disk
	if currentSchema, ok := as.gqlSchemas.GetCurrent(namespace); ok && currentSchema.Loaded {
		return nil
	}

	// otherwise, fetch the schema from disk
	sch, err := getCurrentGraphQLSchema(namespace)
	if err != nil {
		glog.Errorf("namespace: %d. Error reading GraphQL schema: %s.", namespace, err)
		return errors.Wrap(err, "failed to lazy-load GraphQL schema")
	}

	var generatedSchema schema.Schema
	if sch.Schema == "" {
		// if there was no schema stored in Dgraph, we still need to attach resolvers to the main
		// graphql server which should just return errors for any incoming request.
		// generatedSchema will be nil in this case
		glog.Infof("namespace: %d. No GraphQL schema in Dgraph; serving empty GraphQL API",
			namespace)
	} else {
		generatedSchema, err = generateGQLSchema(sch, namespace)
		if err != nil {
			glog.Errorf("namespace: %d. Error processing GraphQL schema: %s.", namespace, err)
			return errors.Wrap(err, "failed to lazy-load GraphQL schema")
		}
	}

	as.mux.Lock()
	defer as.mux.Unlock()
	sch.Loaded = true
	as.gqlSchemas.Set(namespace, sch)
	as.resetSchema(namespace, generatedSchema)

	glog.Infof("namespace: %d. Successfully lazy-loaded GraphQL schema.", namespace)
	return nil
}

func LazyLoadSchema(namespace uint64) error {
	return adminServerVar.lazyLoadSchema(namespace)