Replace custom blob gRPC API with ByteStream

client/third_party/cachetools/__init__.py

Index: client/third_party/cachetools/__init__.py
diff --git a/client/third_party/cachetools/__init__.py b/client/third_party/cachetools/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..646997009fcf22addc77219d7e861b227c1081f4
--- /dev/null
+++ b/client/third_party/cachetools/__init__.py
@@ -0,0 +1,112 @@
+"""Extensible memoizing collections and decorators."""

[Vadim Sh., 2017/06/23 18:26:50]

please add README.swarming file describing where you got this package, at which
revision, etc.

[aludwin, 2017/06/26 17:12:56]

Done. Also updated the other README.swarming.

+
+from __future__ import absolute_import
+
+import functools
+
+from . import keys
+from .cache import Cache
+from .lfu import LFUCache
+from .lru import LRUCache
+from .rr import RRCache
+from .ttl import TTLCache
+
+__all__ = (
+    'Cache', 'LFUCache', 'LRUCache', 'RRCache', 'TTLCache',
+    'cached', 'cachedmethod'
+)
+
+__version__ = '2.0.0'
+
+if hasattr(functools.update_wrapper(lambda f: f(), lambda: 42), '__wrapped__'):
+    _update_wrapper = functools.update_wrapper
+else:
+    def _update_wrapper(wrapper, wrapped):
+        functools.update_wrapper(wrapper, wrapped)
+        wrapper.__wrapped__ = wrapped
+        return wrapper
+
+
+def cached(cache, key=keys.hashkey, lock=None):
+    """Decorator to wrap a function with a memoizing callable that saves
+    results in a cache.
+
+    """
+    def decorator(func):
+        if cache is None:
+            def wrapper(*args, **kwargs):
+                return func(*args, **kwargs)
+        elif lock is None:
+            def wrapper(*args, **kwargs):
+                k = key(*args, **kwargs)
+                try:
+                    return cache[k]
+                except KeyError:
+                    pass  # key not found
+                v = func(*args, **kwargs)
+                try:
+                    cache[k] = v
+                except ValueError:
+                    pass  # value too large
+                return v
+        else:
+            def wrapper(*args, **kwargs):
+                k = key(*args, **kwargs)
+                try:
+                    with lock:
+                        return cache[k]
+                except KeyError:
+                    pass  # key not found
+                v = func(*args, **kwargs)
+                try:
+                    with lock:
+                        cache[k] = v
+                except ValueError:
+                    pass  # value too large
+                return v
+        return _update_wrapper(wrapper, func)
+    return decorator
+
+
+def cachedmethod(cache, key=keys.hashkey, lock=None):
+    """Decorator to wrap a class or instance method with a memoizing
+    callable that saves results in a cache.
+
+    """
+    def decorator(method):
+        if lock is None:
+            def wrapper(self, *args, **kwargs):
+                c = cache(self)
+                if c is None:
+                    return method(self, *args, **kwargs)
+                k = key(self, *args, **kwargs)
+                try:
+                    return c[k]
+                except KeyError:
+                    pass  # key not found
+                v = method(self, *args, **kwargs)
+                try:
+                    c[k] = v
+                except ValueError:
+                    pass  # value too large
+                return v
+        else:
+            def wrapper(self, *args, **kwargs):
+                c = cache(self)
+                if c is None:
+                    return method(self, *args, **kwargs)
+                k = key(self, *args, **kwargs)
+                try:
+                    with lock(self):
+                        return c[k]
+                except KeyError:
+                    pass  # key not found
+                v = method(self, *args, **kwargs)
+                try:
+                    with lock(self):
+                        c[k] = v
+                except ValueError:
+                    pass  # value too large
+                return v
+        return _update_wrapper(wrapper, method)
+    return decorator