feat: add new schema builder methods which allow GC to collect built schemas

Author: takeyourhatoff

datamodel/high/base/schema_proxy.go

@@ -164,6 +164,19 @@ func (sp *SchemaProxy) BuildSchema() (*Schema, error) {
 	return schema, er
 }
 
+func (sp *SchemaProxy) BuildTempSchema() (*Schema, error) {
+	if sp == nil {
+		return nil, nil
+	}
+	s := sp.schema.Value.TempSchema()
+	if s == nil {
+		return nil, sp.schema.Value.GetBuildError()
+	}
+	sch := NewSchema(s)
+	sch.ParentProxy = sp
+	return sch, nil
+}
+
 // GetBuildError returns any error that was thrown when calling Schema()
 func (sp *SchemaProxy) GetBuildError() error {
 	return sp.buildError

datamodel/low/base/schema_proxy.go

@@ -88,6 +88,11 @@ func (sp *SchemaProxy) Schema() *Schema {
 	if sp.rendered != nil {
 		return sp.rendered
 	}
+	sp.rendered = sp.TempSchema()
+	return sp.rendered
+}
+
+func (sp *SchemaProxy) TempSchema() *Schema {
 	schema := new(Schema)
 	utils.CheckForMergeNodes(sp.vn)
 	err := schema.Build(sp.ctx, sp.vn, sp.idx)
@@ -96,8 +101,6 @@ func (sp *SchemaProxy) Schema() *Schema {
 		return nil
 	}
 	schema.ParentProxy = sp // https://github.com/pb33f/libopenapi/issues/29
-	sp.rendered = schema
-
 	// for all the nodes added, copy them over to the schema
 	if sp.NodeMap != nil {
 		sp.NodeMap.Nodes.Range(func(key, value any) bool {