Issue 417 error handling

data_diff/dbt.py

@@ -5,7 +5,7 @@
 import rich
 from dataclasses import dataclass
 from packaging.version import parse as parse_version
-from typing import List, Optional, Dict
+from typing import List, Optional, Dict, Tuple
 
 import requests
 
@@ -28,7 +28,7 @@ def import_dbt():
     send_event_json,
     is_tracking_enabled,
 )
-from .utils import run_as_daemon, truncate_error
+from .utils import get_from_dict_with_raise, run_as_daemon, truncate_error
 from . import connect_to_table, diff_tables, Algorithm
 
 RUN_RESULTS_PATH = "/target/run_results.json"
@@ -308,18 +308,40 @@ def set_project_dict(self):
         with open(self.project_dir + PROJECT_FILE) as project:
             self.project_dict = self.yaml.safe_load(project)
 
-    def set_connection(self):
-        with open(self.profiles_dir + PROFILES_FILE) as profiles:
+    def _get_connection_creds(self) -> Tuple[Dict[str, str], str]:
+        profiles_path = self.profiles_dir + PROFILES_FILE
+        with open(profiles_path) as profiles:
             profiles = self.yaml.safe_load(profiles)
 
         dbt_profile = self.project_dict.get("profile")
-        profile_outputs = profiles.get(dbt_profile)
-        profile_target = profile_outputs.get("target")
-        credentials = profile_outputs.get("outputs").get(profile_target)
-        conn_type = credentials.get("type").lower()
+
+        profile_outputs = get_from_dict_with_raise(
+            profiles, dbt_profile, f"No profile '{dbt_profile}' found in '{profiles_path}'."
+        )
+        profile_target = get_from_dict_with_raise(
+            profile_outputs, "target", f"No target found in profile '{dbt_profile}' in '{profiles_path}'."
+        )
+        outputs = get_from_dict_with_raise(
+            profile_outputs, "outputs", f"No outputs found in profile '{dbt_profile}' in '{profiles_path}'."
+        )
+        credentials = get_from_dict_with_raise(
+            outputs,
+            profile_target,
+            f"No credentials found for target '{profile_target}' in profile '{dbt_profile}' in '{profiles_path}'.",
+        )
+        conn_type = get_from_dict_with_raise(
+            credentials,
+            "type",
+            f"No type found for target '{profile_target}' in profile '{dbt_profile}' in '{profiles_path}'.",
+        )
+        conn_type = conn_type.lower()
 
         # values can contain env_vars
         rendered_credentials = self.ProfileRenderer().render_data(credentials)
+        return rendered_credentials, conn_type
+
+    def set_connection(self):
+        rendered_credentials, conn_type = self._get_connection_creds()
 
         if conn_type == "snowflake":
             if rendered_credentials.get("password") is None or rendered_credentials.get("private_key_path") is not None:

data_diff/utils.py

@@ -1,6 +1,6 @@
 import logging
 import re
-from typing import Iterable, Sequence
+from typing import Dict, Iterable, Sequence
 from urllib.parse import urlparse
 import operator
 import threading
@@ -79,6 +79,13 @@ def truncate_error(error: str):
     return re.sub("'(.*?)'", "'***'", first_line)
 
 
+def get_from_dict_with_raise(dictionary: Dict, key: str, error_message: str):
+    result = dictionary.get(key)
+    if result is None:
+        raise ValueError(error_message)
+    return result
+
+
 class Vector(tuple):
 
     """Immutable implementation of a regular vector over any arithmetic value