513cebe7b7
* Add Virtual Kubelet provider for VIC Initial virtual kubelet provider for VMware VIC. This provider currently handles creating and starting of a pod VM via the VIC portlayer and persona server. Image store handling via the VIC persona server. This provider currently requires the feature/wolfpack branch of VIC. * Added pod stop and delete. Also added node capacity. Added the ability to stop and delete pod VMs via VIC. Also retrieve node capacity information from the VCH. * Cleanup and readme file Some file clean up and added a Readme.md markdown file for the VIC provider. * Cleaned up errors, added function comments, moved operation code 1. Cleaned up error handling. Set standard for creating errors. 2. Added method prototype comments for all interface functions. 3. Moved PodCreator, PodStarter, PodStopper, and PodDeleter to a new folder. * Add mocking code and unit tests for podcache, podcreator, and podstarter Used the unit test framework used in VIC to handle assertions in the provider's unit test. Mocking code generated using OSS project mockery, which is compatible with the testify assertion framework. * Vendored packages for the VIC provider Requires feature/wolfpack branch of VIC and a few specific commit sha of projects used within VIC. * Implementation of POD Stopper and Deleter unit tests (#4) * Updated files for initial PR
156 lines
3.2 KiB
Go
156 lines
3.2 KiB
Go
// Copyright 2016 VMware, Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dns
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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mdns "github.com/miekg/dns"
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)
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// Item represents an item in the cache
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type Item struct {
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Expiration time.Time
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Msg *mdns.Msg
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}
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// CacheOptions represents the cache options
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type CacheOptions struct {
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// Max capacity of cache, after this limit cache starts to evict random elements
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capacity int
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// Default ttl used by items
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ttl time.Duration
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}
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// Cache stores dns.Msgs and their expiration time
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type Cache struct {
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CacheOptions
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// Protects following map
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sync.RWMutex
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m map[string]*Item
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// atomic cache hits & misses counters
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// ^ cause we update them while holding the read lock
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hits uint64
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misses uint64
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}
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// NewCache returns a new cache
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func NewCache(options CacheOptions) *Cache {
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return &Cache{
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CacheOptions: options,
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m: make(map[string]*Item, options.capacity),
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}
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}
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// Capacity returns the capacity of the cache
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func (c *Cache) Capacity() int {
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return c.capacity
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}
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// Count returns the element count of the cache
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func (c *Cache) Count() int {
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c.RLock()
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defer c.RUnlock()
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return len(c.m)
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}
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func generateKey(q mdns.Question) string {
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return fmt.Sprintf("%s:%s", q.Name, mdns.TypeToString[q.Qtype])
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}
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// Add adds dns.Msg to the cache
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func (c *Cache) Add(msg *mdns.Msg) {
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c.Lock()
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defer c.Unlock()
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if len(c.m) >= c.capacity {
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// pick a random key and remove it
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for k := range c.m {
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delete(c.m, k)
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break
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}
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}
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key := generateKey(msg.Question[0])
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if _, ok := c.m[key]; !ok {
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c.m[key] = &Item{
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Expiration: time.Now().UTC().Add(c.ttl),
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Msg: msg.Copy(),
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}
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}
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}
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// Remove removes the dns.Msg from the cache
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func (c *Cache) Remove(msg *mdns.Msg) {
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c.Lock()
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defer c.Unlock()
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if len(c.m) <= 0 {
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return
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}
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key := generateKey(msg.Question[0])
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delete(c.m, key)
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}
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// Get returns the dns.Msg from the cache
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func (c *Cache) Get(msg *mdns.Msg) *mdns.Msg {
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key := generateKey(msg.Question[0])
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c.RLock()
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e, ok := c.m[key]
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c.RUnlock()
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if ok {
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atomic.AddUint64(&c.hits, 1)
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if time.Since(e.Expiration) < 0 {
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return e.Msg.Copy()
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}
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// Expired msg, remove it from the cache
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c.Remove(msg)
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} else {
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atomic.AddUint64(&c.misses, 1)
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}
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return nil
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}
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// Hits returns the number of cache hits
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func (c *Cache) Hits() uint64 {
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return atomic.LoadUint64(&c.hits)
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}
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// Misses returns the number of cache misses
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func (c *Cache) Misses() uint64 {
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return atomic.LoadUint64(&c.misses)
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}
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// Reset resets the cache
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func (c *Cache) Reset() {
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c.Lock()
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defer c.Unlock()
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// drop the old map for GC and reset counters
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c.m = make(map[string]*Item, c.capacity)
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atomic.StoreUint64(&c.hits, 0)
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atomic.StoreUint64(&c.misses, 0)
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}
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