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container_cache.go
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container_cache.go
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// Copyright 2016-2018 VMware, Inc. All Rights Reserved.
//
// 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 exec
import (
"sync"
"context"
"github.com/vmware/govmomi/vim25/types"
"github.com/vmware/vic/pkg/uid"
"github.com/vmware/vic/pkg/vsphere/session"
)
/*
* ContainerCache will provide an in-memory cache of containerVMs. It will
* be refreshed on portlayer start and updated via container lifecycle
* operations (start, stop, rm) and well as in response to infrastructure
* events
*/
type containerCache struct {
m sync.RWMutex
// cache by container id
cache map[string]*Container
}
// Containers is an in-memory cache of containerVMs.
var Containers *containerCache
func NewContainerCache() {
// cache by the container ID and the vsphere
// managed object reference
Containers = &containerCache{
cache: make(map[string]*Container),
}
}
func (conCache *containerCache) Container(idOrRef string) *Container {
conCache.m.RLock()
defer conCache.m.RUnlock()
// find by id or moref
return conCache.cache[idOrRef]
}
func (conCache *containerCache) Containers(states []State) []*Container {
conCache.m.RLock()
defer conCache.m.RUnlock()
// cache contains 2 items for each container
capacity := len(conCache.cache) / 2
containers := make([]*Container, 0, capacity)
for id, con := range conCache.cache {
// is the key a proper ID?
if !isContainerID(id) {
continue
}
// no state filtering
if len(states) == 0 {
containers = append(containers, con)
continue
}
// filter by container state
// DO NOT use container.CurrentState as that can
// cause cache deadlocks
for _, state := range states {
if state == con.State() {
containers = append(containers, con)
}
}
}
return containers
}
// TODO: rework this and Containers above to remove duplication of iteration and filtering logic.
func (conCache *containerCache) References() []types.ManagedObjectReference {
conCache.m.RLock()
defer conCache.m.RUnlock()
// cache contains 2 items for each container
capacity := len(conCache.cache) / 2
references := make([]types.ManagedObjectReference, 0, capacity)
for id, con := range conCache.cache {
// is the key a proper ID?
if !isContainerID(id) {
continue
}
references = append(references, con.VMReference())
}
return references
}
// puts a container in the cache and will overwrite an existing container
func (conCache *containerCache) Put(container *Container) {
// only add containers w/backing VMs
if container.vm == nil {
return
}
conCache.m.Lock()
defer conCache.m.Unlock()
conCache.put(container)
}
func (conCache *containerCache) put(container *Container) {
// add pointer to cache by container ID
conCache.cache[container.ExecConfig.ID] = container
conCache.cache[container.vm.Reference().String()] = container
}
func (conCache *containerCache) Remove(idOrRef string) {
conCache.m.Lock()
defer conCache.m.Unlock()
// find by id
container := conCache.cache[idOrRef]
if container != nil {
delete(conCache.cache, container.ExecConfig.ID)
delete(conCache.cache, container.vm.Reference().String())
}
}
func (conCache *containerCache) sync(ctx context.Context, sess *session.Session) error {
conCache.m.Lock()
defer conCache.m.Unlock()
cons, err := infraContainers(ctx, sess)
if err != nil {
return err
}
conCache.cache = make(map[string]*Container)
for _, c := range cons {
conCache.put(c)
}
return nil
}
func isContainerID(id string) bool {
return uid.Parse(id) != uid.NilUID
}