lint(api): add typed errors from cancelled job and download error

api/onnx_web/convert/utils.py

@@ -16,6 +16,7 @@ from packaging import version
 from torch.onnx import export
 
 from ..constants import ONNX_WEIGHTS
+from ..errors import RequestException
 from ..server import ServerContext
 from ..utils import get_boolean
 
@@ -103,8 +104,8 @@ def download_progress(urls: List[Tuple[str, str]]):
         )
         if req.status_code != 200:
             req.raise_for_status()  # Only works for 4xx errors, per SO answer
-            raise RuntimeError(
+            raise RequestException(
-                "Request to %s failed with status code: %s" % (url, req.status_code)
+                "request to %s failed with status code: %s" % (url, req.status_code)
             )
 
         total = int(req.headers.get("Content-Length", 0))

api/onnx_web/errors.py

@@ -4,3 +4,19 @@ class RetryException(Exception):
     """
 
     pass
+
+
+class CancelledException(Exception):
+    """
+    Used when a job has been cancelled and needs to stop.
+    """
+
+    pass
+
+
+class RequestException(Exception):
+    """
+    Used when an HTTP request has failed.
+    """
+
+    pass

api/onnx_web/worker/context.py

@@ -4,6 +4,7 @@ from typing import Any, Callable, Optional
 
 from torch.multiprocessing import Queue, Value
 
+from ..errors import CancelledException
 from ..params import DeviceParams
 from .command import JobCommand, ProgressCommand
 
@@ -102,7 +103,7 @@ class WorkerContext:
             raise RuntimeError("no job on which to set progress")
 
         if self.is_cancelled():
-            raise RuntimeError("job has been cancelled")
+            raise CancelledException("job has been cancelled")
 
         logger.debug("setting progress for job %s to %s", self.job, progress)
         self.last_progress = ProgressCommand(