added jspg_schemas for mixer

src/lib.rs

@@ -110,6 +110,23 @@ pub fn jspg_validate(schema_id: &str, instance: JsonB) -> JsonB {
   }
 }
 
+#[cfg_attr(not(test), pg_extern)]
+pub fn jspg_schemas() -> JsonB {
+  let engine_opt = {
+    let lock = GLOBAL_JSPG.read().unwrap();
+    lock.clone()
+  };
+
+  match engine_opt {
+    Some(engine) => {
+      let schemas_json = serde_json::to_value(&engine.database.schemas)
+        .unwrap_or(serde_json::Value::Object(serde_json::Map::new()));
+      JsonB(schemas_json)
+    }
+    None => JsonB(serde_json::Value::Object(serde_json::Map::new())),
+  }
+}
+
 #[cfg_attr(not(test), pg_extern)]
 pub fn jspg_stems() -> JsonB {
   let engine_opt = {