Merge pull request #32 from onyx-and-iris/add-request-error-class

Error handling with base error class

README.md

@@ -62,7 +62,7 @@ cl.toggle_input_mute('Mic/Aux')
 
 ### Requests
 
-Method names for requests match the API calls but snake cased.
+Method names for requests match the API calls but snake cased. If a successful call is made with the Request client and the response is expected to contain fields then a response object will be returned. You may then access the response fields as class attributes. They will be snake cased.
 
 example:
 
@@ -70,13 +70,28 @@ example:
 # load conn info from config.toml
 cl = obs.ReqClient()
 
-# GetVersion
+# GetVersion, returns a response object
 resp = cl.get_version()
+# Access it's field as an attribute
+print(f"OBS Version: {resp.obs_version}")
+
 
 # SetCurrentProgramScene
 cl.set_current_program_scene("BRB")
 ```
 
+#### `send(param, data=None, raw=False)`
+
+If you prefer to work with the JSON data directly the {ReqClient}.send() method accepts an argument, `raw`. If set to True the raw response data will be returned, instead of a response object.
+
+example:
+
+```python
+resp = cl_req.send("GetVersion", raw=True)
+
+print(f"response data: {resp}")
+```
+
 For a full list of requests refer to [Requests](https://github.com/obsproject/obs-websocket/blob/master/docs/generated/protocol.md#requests)
 
 ### Events
@@ -128,11 +143,13 @@ def on_scene_created(data):
 
 ### Errors
 
-If a request fails an `OBSSDKError` will be raised with a status code.
-
-For a full list of status codes refer to [Codes](https://github.com/obsproject/obs-websocket/blob/master/docs/generated/protocol.md#requeststatus)
-
-If a timeout occurs during sending/receiving a request or receiving an event an `OBSSDKTimeoutError` will be raised.
+- `OBSSDKError`: Base error class.
+- `OBSSDKTimeoutError`: Raised if a timeout occurs during sending/receiving a request or receiving an event
+- `OBSSDKRequestError`: Raised when a request returns an error code.
+  - The following attributes are available:
+    - `req_name`: name of the request.
+    - `code`: request status code.
+  - For a full list of status codes refer to [Codes](https://github.com/obsproject/obs-websocket/blob/master/docs/generated/protocol.md#requeststatus)
 
 ### Logging
 

obsws_python/baseclient.py

@@ -43,7 +43,7 @@ class ObsClient:
         except ValueError as e:
             self.logger.error(f"{type(e).__name__}: {e}")
             raise
-        except (ConnectionRefusedError, WebSocketTimeoutException) as e:
+        except (ConnectionRefusedError, TimeoutError, WebSocketTimeoutException) as e:
             self.logger.exception(f"{type(e).__name__}: {e}")
             raise
 
@@ -97,9 +97,9 @@ class ObsClient:
             auth = base64.b64encode(
                 hashlib.sha256(
                     (
-                        secret.decode()
-                        + self.server_hello["d"]["authentication"]["challenge"]
-                    ).encode()
+                        secret
+                        + self.server_hello["d"]["authentication"]["challenge"].encode()
+                    )
                 ).digest()
             ).decode()
 
@@ -110,7 +110,7 @@ class ObsClient:
             response = json.loads(self.ws.recv())
             if response["op"] != 2:
                 raise OBSSDKError(
-                    "failed to identify client with the server, expected response with OpCode 2 Identified"
+                    "failed to identify client with the server, expected response with OpCode 2"
                 )
             return response["d"]
         except json.decoder.JSONDecodeError:

obsws_python/error.py

@@ -1,6 +1,18 @@
 class OBSSDKError(Exception):
-    """Exception raised when general errors occur"""
+    """Base class for OBSSDK errors"""
 
 
-class OBSSDKTimeoutError(Exception):
+class OBSSDKTimeoutError(OBSSDKError):
     """Exception raised when a connection times out"""
+
+
+class OBSSDKRequestError(OBSSDKError):
+    """Exception raised when a request returns an error code"""
+
+    def __init__(self, req_name, code, comment):
+        self.req_name = req_name
+        self.code = code
+        message = f"Request {self.req_name} returned code {self.code}."
+        if comment:
+            message += f" With message: {comment}"
+        super().__init__(message)

obsws_python/reqs.py

@@ -1,7 +1,7 @@
 import logging
 
 from .baseclient import ObsClient
-from .error import OBSSDKError
+from .error import OBSSDKError, OBSSDKRequestError
 from .util import as_dataclass
 
 """
@@ -43,14 +43,17 @@ class ReqClient:
         return type(self).__name__
 
     def send(self, param, data=None, raw=False):
+        try:
             response = self.base_client.req(param, data)
             if not response["requestStatus"]["result"]:
-            error = (
-                f"Request {response['requestType']} returned code {response['requestStatus']['code']}",
+                raise OBSSDKRequestError(
+                    response["requestType"],
+                    response["requestStatus"]["code"],
+                    response["requestStatus"].get("comment"),
                 )
-            if "comment" in response["requestStatus"]:
-                error += (f"With message: {response['requestStatus']['comment']}",)
-            raise OBSSDKError("\n".join(error))
+        except OBSSDKRequestError as e:
+            self.logger.exception(f"{type(e).__name__}: {e}")
+            raise
         if "responseData" in response:
             if raw:
                 return response["responseData"]

obsws_python/version.py

@@ -1 +1 @@
-version = "1.5.2"
+version = "1.6.0"

tests/test_error.py

@@ -0,0 +1,35 @@
+import pytest
+
+import obsws_python as obsws
+from tests import req_cl
+
+
+class TestErrors:
+    __test__ = True
+
+    def test_it_raises_an_obssdk_error_on_incorrect_password(self):
+        bad_conn = {"host": "localhost", "port": 4455, "password": "incorrectpassword"}
+        with pytest.raises(
+            obsws.error.OBSSDKError,
+            match="failed to identify client with the server, please check connection settings",
+        ):
+            obsws.ReqClient(**bad_conn)
+
+    def test_it_raises_an_obssdk_error_if_auth_enabled_but_no_password_provided(self):
+        bad_conn = {"host": "localhost", "port": 4455, "password": ""}
+        with pytest.raises(
+            obsws.error.OBSSDKError,
+            match="authentication enabled but no password provided",
+        ):
+            obsws.ReqClient(**bad_conn)
+
+    def test_it_raises_a_request_error_on_invalid_request(self):
+        with pytest.raises(
+            obsws.error.OBSSDKRequestError,
+            match="Request SetCurrentProgramScene returned code 600. With message: No source was found by the name of `invalid`.",
+        ) as exc_info:
+            req_cl.set_current_program_scene("invalid")
+
+        e = exc_info.value
+        assert e.req_name == "SetCurrentProgramScene"
+        assert e.code == 600