Fix processor config loading for object-storage model paths (#31211)

Co-authored-by: Alex Nails <alex.nails@radixark.ai>

python/sglang/srt/utils/hf_transformers/processor.py

@@ -153,6 +153,8 @@ def get_processor(
 
     revision = kwargs.pop("revision", tokenizer_revision)
     tokenizer_name = resolve_runai_obj_uri(tokenizer_name)
+    if model_name is not None:
+        model_name = resolve_runai_obj_uri(model_name)
 
     if is_mistral_model(tokenizer_name):
         config = load_mistral_config(

test/registered/unit/utils/test_hf_transformers.py

@@ -8,11 +8,12 @@ import inspect
 import tempfile
 import unittest
 from types import SimpleNamespace
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
 from transformers import PretrainedConfig
 from transformers.image_processing_utils import BaseImageProcessor
 
+import sglang.srt.utils.hf_transformers.processor as processor_utils
 from sglang.srt.utils import hf_transformers_patches
 from sglang.srt.utils.hf_transformers.common import (
     _is_deepseek_ocr2_model,
@@ -31,6 +32,45 @@ from sglang.test.ci.ci_register import register_cpu_ci
 register_cpu_ci(est_time=6, suite="base-a-test-cpu")
 
 
+# ---------------------------------------------------------------------------
+# get_processor
+# ---------------------------------------------------------------------------
+
+
+class TestGetProcessor(unittest.TestCase):
+    def test_resolves_model_name_before_loading_config(self):
+        remote_model = "s3://bucket/model"
+        local_model = "/cache/model"
+        config = SimpleNamespace(model_type="clip", auto_map={})
+        loaded_processor = MagicMock()
+        loaded_processor.tokenizer.chat_template = "template"
+        auto_config = MagicMock()
+        auto_config.from_pretrained.return_value = config
+        auto_processor = MagicMock()
+        auto_processor.from_pretrained.return_value = loaded_processor
+
+        def resolve_uri(path):
+            return local_model if path == remote_model else path
+
+        with patch.multiple(
+            processor_utils,
+            resolve_runai_obj_uri=MagicMock(side_effect=resolve_uri),
+            AutoConfig=auto_config,
+            AutoProcessor=auto_processor,
+        ):
+            processor = processor_utils.get_processor(
+                "local-tokenizer",
+                model_name=remote_model,
+            )
+
+        self.assertIs(processor, loaded_processor)
+        auto_config.from_pretrained.assert_called_once_with(
+            local_model,
+            trust_remote_code=False,
+            revision=None,
+        )
+
+
 # ---------------------------------------------------------------------------
 # _patch_image_processor_kwargs
 # ---------------------------------------------------------------------------