Replace custom blob gRPC API with ByteStream

client/third_party/cachetools/rr.py

Index: client/third_party/cachetools/rr.py
diff --git a/client/third_party/cachetools/rr.py b/client/third_party/cachetools/rr.py
new file mode 100644
index 0000000000000000000000000000000000000000..8cd856c3727827cbf076c33ff0b65bcc89b7a68c
--- /dev/null
+++ b/client/third_party/cachetools/rr.py
@@ -0,0 +1,28 @@
+from __future__ import absolute_import
+
+import random
+
+from .cache import Cache
+
+
+class RRCache(Cache):
+    """Random Replacement (RR) cache implementation."""
+
+    def __init__(self, maxsize, choice=random.choice, missing=None,
+                 getsizeof=None):
+        Cache.__init__(self, maxsize, missing, getsizeof)
+        self.__choice = choice
+
+    @property
+    def choice(self):
+        """The `choice` function used by the cache."""
+        return self.__choice
+
+    def popitem(self):
+        """Remove and return a random `(key, value)` pair."""
+        try:
+            key = self.__choice(list(self))
+        except IndexError:
+            raise KeyError('%s is empty' % self.__class__.__name__)
+        else:
+            return (key, self.pop(key))