dev(narugo): raise error on every unexpected branches

src/huggingface_hub/file_download.py

@@ -365,9 +365,7 @@ def http_get(
     initial_headers = headers
     headers = copy.deepcopy(headers) or {}
     if resume_size > 0:
-        adjusted_range = _adjust_range_header(headers.get("Range"), resume_size)
-        if adjusted_range is not None:
-            headers["Range"] = adjusted_range
+        headers["Range"] = _adjust_range_header(headers.get("Range"), resume_size)
 
     r = _request_wrapper(
         method="GET", url=url, stream=True, proxies=proxies, headers=headers, timeout=constants.HF_HUB_DOWNLOAD_TIMEOUT

src/huggingface_hub/utils/_http.py

@@ -20,7 +20,6 @@
 import threading
 import time
 import uuid
-import warnings
 from functools import lru_cache
 from http import HTTPStatus
 from shlex import quote
@@ -605,8 +604,7 @@ def _adjust_range_header(original_range: Optional[str], resume_size: int) -> Opt
         return f"bytes={resume_size}-"
 
     if "," in original_range:
-        warnings.warn(f"Multiple ranges detected - {original_range!r}, using full range after resume", UserWarning)
-        return f"bytes={resume_size}-"
+        raise ValueError(f"Multiple ranges detected - {original_range!r}, not supported yet.")
 
     match = RANGE_REGEX.match(original_range)
     if not match:
@@ -618,16 +616,18 @@ def _adjust_range_header(original_range: Optional[str], resume_size: int) -> Opt
             raise RuntimeError(f"Invalid range format - {original_range!r}.")
 
         new_suffix = int(end) - resume_size
+        new_range = f"bytes=-{new_suffix}"
         if new_suffix <= 0:
-            return None
-        return f"bytes=-{new_suffix}"
+            raise RuntimeError(f"Empty new range - {new_range!r}.")
+        return new_range
 
     start = int(start)
     new_start = start + resume_size
     if end:
         end = int(end)
+        new_range = f"bytes={new_start}-{end}"
         if new_start > end:
-            return None
-        return f"bytes={new_start}-{end}"
+            raise RuntimeError(f"Empty new range - {new_range!r}.")
+        return new_range
 
     return f"bytes={new_start}-"

tests/test_utils_http.py

@@ -319,6 +319,7 @@ def test_adjust_range_header():
     assert _adjust_range_header(None, 10) == "bytes=10-"
     assert _adjust_range_header("bytes=0-100", 10) == "bytes=10-100"
     assert _adjust_range_header("bytes=-100", 10) == "bytes=-90"
+    assert _adjust_range_header("bytes=100-", 10) == "bytes=110-"
 
     with pytest.raises(RuntimeError):
         _adjust_range_header("invalid", 10)
@@ -327,8 +328,11 @@ def test_adjust_range_header():
         _adjust_range_header("bytes=-", 10)
 
     # Multiple ranges
-    assert _adjust_range_header("bytes=0-100,200-300", 10) == "bytes=10-"
+    with pytest.raises(ValueError):
+        _adjust_range_header("bytes=0-100,200-300", 10)
 
     # Resume size exceeds range
-    assert _adjust_range_header("bytes=0-100", 150) is None
-    assert _adjust_range_header("bytes=-50", 100) is None
+    with pytest.raises(RuntimeError):
+        _adjust_range_header("bytes=0-100", 150)
+    with pytest.raises(RuntimeError):
+        _adjust_range_header("bytes=-50", 100)