[CI/Build] Minor refactoring for vLLM assets (#7407)

vllm/assets/base.py

+from functools import lru_cache
 from pathlib import Path
+from typing import Optional
 
 import vllm.envs as envs
+from vllm.connections import global_http_connection
+from vllm.envs import VLLM_IMAGE_FETCH_TIMEOUT
 
+vLLM_S3_BUCKET_URL = "https://vllm-public-assets.s3.us-west-2.amazonaws.com"
 
-def get_cache_dir():
+
+def get_cache_dir() -> Path:
     """Get the path to the cache for storing downloaded assets."""
     path = Path(envs.VLLM_ASSETS_CACHE)
     path.mkdir(parents=True, exist_ok=True)
 
     return path
+
+
+@lru_cache
+def get_vllm_public_assets(filename: str,
+                           s3_prefix: Optional[str] = None) -> Path:
+    """
+    Download an asset file from ``s3://vllm-public-assets``
+    and return the path to the downloaded file.
+    """
+    asset_directory = get_cache_dir() / "vllm_public_assets"
+    asset_directory.mkdir(parents=True, exist_ok=True)
+
+    asset_path = asset_directory / filename
+    if not asset_path.exists():
+        if s3_prefix is not None:
+            filename = s3_prefix + "/" + filename
+        global_http_connection.download_file(
+            f"{vLLM_S3_BUCKET_URL}/{filename}",
+            asset_path,
+            timeout=VLLM_IMAGE_FETCH_TIMEOUT)
+
+    return asset_path

vllm/assets/image.py

 from dataclasses import dataclass
-from functools import lru_cache
 from typing import Literal
 
 from PIL import Image
 
-from vllm.connections import global_http_connection
-from vllm.envs import VLLM_IMAGE_FETCH_TIMEOUT
+from vllm.assets.base import get_vllm_public_assets
 
-from .base import get_cache_dir
-
-
-@lru_cache
-def get_air_example_data_2_asset(filename: str) -> Image.Image:
-    """
-    Download and open an image from
-    ``s3://air-example-data-2/vllm_opensource_llava/``.
-    """
-    image_directory = get_cache_dir() / "air-example-data-2"
-    image_directory.mkdir(parents=True, exist_ok=True)
-
-    image_path = image_directory / filename
-    if not image_path.exists():
-        base_url = "https://air-example-data-2.s3.us-west-2.amazonaws.com/vllm_opensource_llava"
-
-        global_http_connection.download_file(f"{base_url}/{filename}",
-                                             image_path,
-                                             timeout=VLLM_IMAGE_FETCH_TIMEOUT)
-
-    return Image.open(image_path)
+VLM_IMAGES_DIR = "vision_model_images"
 
 
 @dataclass(frozen=True)
@@ -36,4 +14,7 @@ class ImageAsset:
 
     @property
     def pil_image(self) -> Image.Image:
-        return get_air_example_data_2_asset(f"{self.name}.jpg")
+
+        image_path = get_vllm_public_assets(filename=f"{self.name}.jpg",
+                                            s3_prefix=VLM_IMAGES_DIR)
+        return Image.open(image_path)