memoize a couple of things

From 996b2fef47ae4417f54adac77c57ef324822e497 Mon Sep 17 00:00:00 2001
From: John Dickinson <me@not.mn>
Date: Mon, 14 Sep 2015 11:16:27 -0700
Subject: [PATCH] memoize ismount with LRUCache in obj replicator memoize
 base._get_info_cache to avoid memcache lookups

layering caches--what could possibly go wrong?

Change-Id: Idf2dd501c9b26f5ddb85b398860e1f5d52e5cac5
---
 swift/obj/replicator.py         | 10 ++++++++--
 swift/proxy/controllers/base.py |  3 ++-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/swift/obj/replicator.py b/swift/obj/replicator.py
index 7a8613d..c1397f8 100644
--- a/swift/obj/replicator.py
+++ b/swift/obj/replicator.py
@@ -31,9 +31,9 @@ from eventlet.support.greenlets import GreenletExit
 
 from swift.common.ring.utils import is_local_device
 from swift.common.utils import whataremyips, unlink_older_than, \
-    compute_eta, get_logger, dump_recon_cache, ismount, \
+    compute_eta, get_logger, dump_recon_cache, ismount as _utils_ismount, \
     rsync_module_interpolation, mkdirs, config_true_value, list_from_csv, \
-    get_hub, tpool_reraise, config_auto_int_value, storage_directory
+    get_hub, tpool_reraise, config_auto_int_value, storage_directory, LRUCache
 from swift.common.bufferedhttp import http_connect
 from swift.common.daemon import Daemon
 from swift.common.http import HTTP_OK, HTTP_INSUFFICIENT_STORAGE
@@ -46,6 +46,12 @@ DEFAULT_RSYNC_TIMEOUT = 900
 hubs.use_hub(get_hub())
 
 
+@LRUCache()
+def _cached_ismount(*a, **kw):
+    return _utils_ismount(*a, **kw)
+ismount = _cached_ismount
+
+
 class ObjectReplicator(Daemon):
     """
     Replicate objects.
diff --git a/swift/proxy/controllers/base.py b/swift/proxy/controllers/base.py
index 7dcc1ca..ccc35da 100644
--- a/swift/proxy/controllers/base.py
+++ b/swift/proxy/controllers/base.py
@@ -42,7 +42,7 @@ import six
 from swift.common.wsgi import make_pre_authed_env
 from swift.common.utils import Timestamp, config_true_value, \
     public, split_path, list_from_csv, GreenthreadSafeIterator, \
-    GreenAsyncPile, quorum_size, parse_content_type, \
+    GreenAsyncPile, quorum_size, parse_content_type, LRUCache \
     document_iters_to_http_response_body
 from swift.common.bufferedhttp import http_connect
 from swift.common.exceptions import ChunkReadTimeout, ChunkWriteTimeout, \
@@ -452,6 +452,7 @@ def clear_info_cache(app, env, account, container=None):
     _set_info_cache(app, env, account, container, None)
 
 
+@LRUCache()
 def _get_info_cache(app, env, account, container=None):
     """
     Get the cached info from env or memcache (if used) in that order
-- 
2.8.0