Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

3 files changed, 397 insertions, 0 deletions

diff --git a/vendor/github.com/golang/groupcache/LICENSE b/vendor/github.com/golang/groupcache/LICENSE
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index 000000000..37ec93a14
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+++ b/vendor/github.com/golang/groupcache/LICENSE
@@ -0,0 +1,191 @@
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+
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diff --git a/vendor/github.com/golang/groupcache/README.md b/vendor/github.com/golang/groupcache/README.md
new file mode 100644
index 000000000..70c29da16
--- /dev/null
+++ b/vendor/github.com/golang/groupcache/README.md
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+# groupcache
+
+## Summary
+
+groupcache is a caching and cache-filling library, intended as a
+replacement for memcached in many cases.
+
+For API docs and examples, see http://godoc.org/github.com/golang/groupcache
+
+## Comparison to memcached
+
+### **Like memcached**, groupcache:
+
+ * shards by key to select which peer is responsible for that key
+
+### **Unlike memcached**, groupcache:
+
+ * does not require running a separate set of servers, thus massively
+   reducing deployment/configuration pain.  groupcache is a client
+   library as well as a server.  It connects to its own peers.
+
+ * comes with a cache filling mechanism.  Whereas memcached just says
+   "Sorry, cache miss", often resulting in a thundering herd of
+   database (or whatever) loads from an unbounded number of clients
+   (which has resulted in several fun outages), groupcache coordinates
+   cache fills such that only one load in one process of an entire
+   replicated set of processes populates the cache, then multiplexes
+   the loaded value to all callers.
+
+ * does not support versioned values.  If key "foo" is value "bar",
+   key "foo" must always be "bar".  There are neither cache expiration
+   times, nor explicit cache evictions.  Thus there is also no CAS,
+   nor Increment/Decrement.  This also means that groupcache....
+
+ * ... supports automatic mirroring of super-hot items to multiple
+   processes.  This prevents memcached hot spotting where a machine's
+   CPU and/or NIC are overloaded by very popular keys/values.
+
+ * is currently only available for Go.  It's very unlikely that I
+   (bradfitz@) will port the code to any other language.
+
+## Loading process
+
+In a nutshell, a groupcache lookup of **Get("foo")** looks like:
+
+(On machine #5 of a set of N machines running the same code)
+
+ 1. Is the value of "foo" in local memory because it's super hot?  If so, use it.
+
+ 2. Is the value of "foo" in local memory because peer #5 (the current
+    peer) is the owner of it?  If so, use it.
+
+ 3. Amongst all the peers in my set of N, am I the owner of the key
+    "foo"?  (e.g. does it consistent hash to 5?)  If so, load it.  If
+    other callers come in, via the same process or via RPC requests
+    from peers, they block waiting for the load to finish and get the
+    same answer.  If not, RPC to the peer that's the owner and get
+    the answer.  If the RPC fails, just load it locally (still with
+    local dup suppression).
+
+## Users
+
+groupcache is in production use by dl.google.com (its original user),
+parts of Blogger, parts of Google Code, parts of Google Fiber, parts
+of Google production monitoring systems, etc.
+
+## Presentations
+
+See http://talks.golang.org/2013/oscon-dl.slide
+
+## Help
+
+Use the golang-nuts mailing list for any discussion or questions.
diff --git a/vendor/github.com/golang/groupcache/lru/lru.go b/vendor/github.com/golang/groupcache/lru/lru.go
new file mode 100644
index 000000000..532cc45e6
--- /dev/null
+++ b/vendor/github.com/golang/groupcache/lru/lru.go
@@ -0,0 +1,133 @@
+/*
+Copyright 2013 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package lru implements an LRU cache.
+package lru
+
+import "container/list"
+
+// Cache is an LRU cache. It is not safe for concurrent access.
+type Cache struct {
+	// MaxEntries is the maximum number of cache entries before
+	// an item is evicted. Zero means no limit.
+	MaxEntries int
+
+	// OnEvicted optionally specificies a callback function to be
+	// executed when an entry is purged from the cache.
+	OnEvicted func(key Key, value interface{})
+
+	ll    *list.List
+	cache map[interface{}]*list.Element
+}
+
+// A Key may be any value that is comparable. See http://golang.org/ref/spec#Comparison_operators
+type Key interface{}
+
+type entry struct {
+	key   Key
+	value interface{}
+}
+
+// New creates a new Cache.
+// If maxEntries is zero, the cache has no limit and it's assumed
+// that eviction is done by the caller.
+func New(maxEntries int) *Cache {
+	return &Cache{
+		MaxEntries: maxEntries,
+		ll:         list.New(),
+		cache:      make(map[interface{}]*list.Element),
+	}
+}
+
+// Add adds a value to the cache.
+func (c *Cache) Add(key Key, value interface{}) {
+	if c.cache == nil {
+		c.cache = make(map[interface{}]*list.Element)
+		c.ll = list.New()
+	}
+	if ee, ok := c.cache[key]; ok {
+		c.ll.MoveToFront(ee)
+		ee.Value.(*entry).value = value
+		return
+	}
+	ele := c.ll.PushFront(&entry{key, value})
+	c.cache[key] = ele
+	if c.MaxEntries != 0 && c.ll.Len() > c.MaxEntries {
+		c.RemoveOldest()
+	}
+}
+
+// Get looks up a key's value from the cache.
+func (c *Cache) Get(key Key) (value interface{}, ok bool) {
+	if c.cache == nil {
+		return
+	}
+	if ele, hit := c.cache[key]; hit {
+		c.ll.MoveToFront(ele)
+		return ele.Value.(*entry).value, true
+	}
+	return
+}
+
+// Remove removes the provided key from the cache.
+func (c *Cache) Remove(key Key) {
+	if c.cache == nil {
+		return
+	}
+	if ele, hit := c.cache[key]; hit {
+		c.removeElement(ele)
+	}
+}
+
+// RemoveOldest removes the oldest item from the cache.
+func (c *Cache) RemoveOldest() {
+	if c.cache == nil {
+		return
+	}
+	ele := c.ll.Back()
+	if ele != nil {
+		c.removeElement(ele)
+	}
+}
+
+func (c *Cache) removeElement(e *list.Element) {
+	c.ll.Remove(e)
+	kv := e.Value.(*entry)
+	delete(c.cache, kv.key)
+	if c.OnEvicted != nil {
+		c.OnEvicted(kv.key, kv.value)
+	}
+}
+
+// Len returns the number of items in the cache.
+func (c *Cache) Len() int {
+	if c.cache == nil {
+		return 0
+	}
+	return c.ll.Len()
+}
+
+// Clear purges all stored items from the cache.
+func (c *Cache) Clear() {
+	if c.OnEvicted != nil {
+		for _, e := range c.cache {
+			kv := e.Value.(*entry)
+			c.OnEvicted(kv.key, kv.value)
+		}
+	}
+	c.ll = nil
+	c.cache = nil
+}