refactor(catalog): update error handling and pandas import logic

csst_dfs_client/catalog.py

@@ -37,6 +37,7 @@ def search(ra: float,
         columns = ['*']
 
     try:
+        import pandas as pd
         datas = request.post('/api/catalog', {
                 'ra': ra,
                 'dec': dec,
@@ -74,6 +75,8 @@ def all_catalog_names() -> Result:
             return datas
         records = pickle.loads(datas._content)
         return Result.ok_data(data = records)
+    except ImportError:
+        return Result.error("pandas is not installed")        
     except Exception as e:
         return Result.error(str(e))
 
@@ -89,10 +92,13 @@ def describe_catalog(catalog_name: str) -> Result:
 
     """
     try:
+        import pandas as pd
         datas = request.get(f'/api/catalog/describe/{catalog_name}')
         if datas and isinstance(datas, Result):
             return datas
         records = pickle.loads(datas._content)
         return Result.ok_data(data = records)
+    except ImportError:
+        return Result.error("pandas is not installed")    
     except Exception as e:
         return Result.error(str(e))

csst_dfs_client/common/__init__.py

@@ -30,9 +30,9 @@ class Result(dict):
         return str(self["message"])
         
     @staticmethod
-    def error(code: int = 500, message: str = "") -> "Result":
+    def error(message: str = "") -> "Result":
         r = Result()
-        r["code"] = code
+        r["code"] = 500
         r["message"] = message
         return r