6fecda710c
Move the readiness managing logic into pkg/kubelet/container package to facilitate the pluggable container runtime.
103 lines
3.5 KiB
Go
103 lines
3.5 KiB
Go
/*
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Copyright 2015 Google Inc. All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package container
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import (
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"fmt"
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"sync"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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)
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// RefManager manages the references for the containers.
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// The references are used for reporting events such as creation,
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// failure, etc. This manager is thread-safe, no locks are necessary
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// for the caller.
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type RefManager struct {
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sync.RWMutex
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// TODO(yifan): To use strong type.
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containerIDToRef map[string]*api.ObjectReference
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}
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// NewRefManager creates and returns a container reference manager
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// with empty contents.
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func NewRefManager() *RefManager {
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return &RefManager{containerIDToRef: make(map[string]*api.ObjectReference)}
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}
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// SetRef stores a reference to a pod's container, associating it with the given container ID.
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func (c *RefManager) SetRef(id string, ref *api.ObjectReference) {
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c.Lock()
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defer c.Unlock()
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c.containerIDToRef[id] = ref
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}
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// ClearRef forgets the given container id and its associated container reference.
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// TODO(yifan): This is currently never called. Consider to remove this function,
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// or figure out when to clear the references.
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func (c *RefManager) ClearRef(id string) {
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c.Lock()
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defer c.Unlock()
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delete(c.containerIDToRef, id)
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}
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// GetRef returns the container reference of the given ID, or (nil, false) if none is stored.
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func (c *RefManager) GetRef(id string) (ref *api.ObjectReference, ok bool) {
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c.RLock()
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defer c.RUnlock()
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ref, ok = c.containerIDToRef[id]
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return ref, ok
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}
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// fieldPath returns a fieldPath locating container within pod.
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// Returns an error if the container isn't part of the pod.
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func fieldPath(pod *api.Pod, container *api.Container) (string, error) {
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for i := range pod.Spec.Containers {
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here := &pod.Spec.Containers[i]
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if here.Name == container.Name {
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if here.Name == "" {
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return fmt.Sprintf("spec.containers[%d]", i), nil
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} else {
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return fmt.Sprintf("spec.containers{%s}", here.Name), nil
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}
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}
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}
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return "", fmt.Errorf("container %#v not found in pod %#v", container, pod)
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}
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// GenerateContainerRef returns an *api.ObjectReference which references the given container within the
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// given pod. Returns an error if the reference can't be constructed or the container doesn't
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// actually belong to the pod.
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// TODO: Pods that came to us by static config or over HTTP have no selfLink set, which makes
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// this fail and log an error. Figure out how we want to identify these pods to the rest of the
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// system.
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// TODO(yifan): Revisit this function later, for current case it does not need to use RefManager
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// as a receiver.
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func (c *RefManager) GenerateContainerRef(pod *api.Pod, container *api.Container) (*api.ObjectReference, error) {
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fieldPath, err := fieldPath(pod, container)
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if err != nil {
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// TODO: figure out intelligent way to refer to containers that we implicitly
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// start (like the pod infra container). This is not a good way, ugh.
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fieldPath = "implicitly required container " + container.Name
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}
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ref, err := api.GetPartialReference(pod, fieldPath)
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if err != nil {
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return nil, err
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}
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return ref, nil
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}
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