Convert complex type to JS object

Convert the rust Complex type to an object of the type expected
by the JS encoder.

This commit is copied from #275 PR

Author: adespawn

lib/types/cql-utils.js

@@ -480,6 +480,39 @@ function convertHints(hints) {
     return result;
 }
 
+/**
+ * Convert rust ComplexType into type representation used in the driver encoder
+ * @param {rust.ComplexType} type
+ */
+function convertComplexType(type) {
+    let data = {
+        code: type.baseType.valueOf(),
+    };
+    let fistSupport = type.getFirstSupportType();
+    let secondSupport = type.getSecondSupportType();
+    let otherTypes = type.getInnerTypes();
+    if (fistSupport != null) {
+        data.info = convertComplexType(fistSupport);
+        if (secondSupport != null) {
+            data.info = [data.info, convertComplexType(secondSupport)];
+        }
+    } else if (otherTypes.length > 0) {
+        if (data.code == rust.CqlType.UserDefinedType) {
+            let names = type.getUdtFieldNames();
+            data.info = {
+                fields: otherTypes.map((typ, index) => {
+                    let obj = { type: convertComplexType(typ) };
+                    obj.name = names[index];
+                    return obj;
+                }),
+            };
+        } else {
+            data.info = otherTypes.map((t) => convertComplexType(t));
+        }
+    }
+    return data;
+}
+
 /**
  *
  * @param {null | object | Array<object>} object
@@ -495,6 +528,7 @@ function rustConvertHint(object) {
 module.exports.parseParams = parseParams;
 module.exports.convertHints = convertHints;
 module.exports.rustConvertHint = rustConvertHint;
+module.exports.convertComplexType = convertComplexType;
 
 // For unit test usage
 module.exports.getWrapped = getWrapped;

src/types/type_wrappers.rs

@@ -177,6 +177,11 @@ impl ComplexType {
             }),
         }
     }
+
+    #[napi]
+    pub fn get_udt_names(&self) -> Option<Vec<String>> {
+        self.udt_metadata.as_ref().map(|e| e.field_names.clone())
+    }
 }
 
 impl ComplexType {