chore: disable blob cache by default

Author: 崔佳磊

client/starwhale/base/cloud_blob_cache.py

@@ -19,8 +19,11 @@ def __init__(self, ip: str) -> None:
 
 
 def init() -> None:
+    enable_blob_cache = os.getenv("SW_ENABLE_BLOB_CACHE", "false").lower() == "true"
     global _servers
-    if _servers is None:
+    if not enable_blob_cache:
+        _servers = []
+    elif _servers is None:
         try:
             _servers = [
                 _Server(ip) for ip in socket.gethostbyname_ex(_pseudo_host_name)[2]

client/tests/base/test_cloud_blob_cache.py

@@ -1,3 +1,4 @@
+import os
 from unittest import TestCase
 from unittest.mock import patch, MagicMock
 
@@ -13,6 +14,15 @@ def test_replace_url(self, gethostbyname_ex: MagicMock) -> None:
         )
 
         gethostbyname_ex.return_value = ("localhost", [], ["1", "2", "3"])
+
+        os.environ["SW_ENABLE_BLOB_CACHE"] = "false"
+        cloud_blob_cache.init()
+        iter = cloud_blob_cache.replace_url("https://t/other?a=1", True)
+        for _ in range(10):
+            self.assertEqual(next(iter), "https://t/other?a=1")
+
+        cloud_blob_cache._servers = None
+        os.environ["SW_ENABLE_BLOB_CACHE"] = "true"
         cloud_blob_cache.init()
         iter = cloud_blob_cache.replace_url("https://t/other?a=1", True)
         for _ in range(10):