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package libpod
import (
"os"
"path/filepath"
"github.com/containers/storage"
"github.com/docker/docker/pkg/namesgenerator"
"github.com/docker/docker/pkg/stringid"
"github.com/pkg/errors"
)
// Pod represents a group of containers that may share namespaces
type Pod struct {
id string
name string
labels map[string]string
containers map[string]*Container
valid bool
lock storage.Locker
}
// ID retrieves the pod's ID
func (p *Pod) ID() string {
return p.id
}
// Name retrieves the pod's name
func (p *Pod) Name() string {
return p.name
}
// Labels returns the pod's labels
func (p *Pod) Labels() map[string]string {
labels := make(map[string]string)
for key, value := range p.labels {
labels[key] = value
}
return labels
}
// Creates a new, empty pod
func newPod(lockDir string) (*Pod, error) {
pod := new(Pod)
pod.id = stringid.GenerateNonCryptoID()
pod.name = namesgenerator.GetRandomName(0)
pod.containers = make(map[string]*Container)
// TODO: containers and pods share a locks folder, but not tables in the
// database
// As the locks are 256-bit pseudorandom integers, collision is unlikely
// But it's something worth looking into
// Path our lock file will reside at
lockPath := filepath.Join(lockDir, pod.id)
// Ensure there is no conflict - file does not exist
_, err := os.Stat(lockPath)
if err == nil || !os.IsNotExist(err) {
return nil, errors.Wrapf(ErrCtrExists, "lockfile for pod ID %s already exists", pod.id)
}
// Grab a lockfile at the given path
lock, err := storage.GetLockfile(lockPath)
if err != nil {
return nil, errors.Wrapf(err, "error creating lockfile for new pod")
}
pod.lock = lock
return pod, nil
}
// Adds a container to the pod
// Does not check that container's pod ID is set correctly, or attempt to set
// pod ID after adding
func (p *Pod) addContainer(ctr *Container) error {
p.lock.Lock()
defer p.lock.Unlock()
if !p.valid {
return ErrPodRemoved
}
if !ctr.valid {
return ErrCtrRemoved
}
if _, ok := p.containers[ctr.ID()]; ok {
return errors.Wrapf(ErrCtrExists, "container with ID %s already exists in pod %s", ctr.ID(), p.id)
}
p.containers[ctr.ID()] = ctr
return nil
}
// Removes a container from the pod
// Does not perform any checks on the container
func (p *Pod) removeContainer(ctr *Container) error {
p.lock.Lock()
defer p.lock.Unlock()
if !p.valid {
return ErrPodRemoved
}
if _, ok := p.containers[ctr.ID()]; !ok {
return errors.Wrapf(ErrNoSuchCtr, "no container with id %s in pod %s", ctr.ID(), p.id)
}
delete(p.containers, ctr.ID())
return nil
}
// Start starts all containers within a pod that are not already running
func (p *Pod) Start() error {
return ErrNotImplemented
}
// Stop stops all containers within a pod that are not already stopped
func (p *Pod) Stop() error {
return ErrNotImplemented
}
// Kill sends a signal to all running containers within a pod
func (p *Pod) Kill(signal uint) error {
return ErrNotImplemented
}
// HasContainer checks if a container is present in the pod
func (p *Pod) HasContainer(id string) (bool, error) {
p.lock.Lock()
defer p.lock.Unlock()
if !p.valid {
return false, ErrPodRemoved
}
_, ok := p.containers[id]
return ok, nil
}
// GetContainers retrieves the containers in the pod
func (p *Pod) GetContainers() ([]*Container, error) {
p.lock.Lock()
defer p.lock.Unlock()
if !p.valid {
return nil, ErrPodRemoved
}
ctrs := make([]*Container, 0, len(p.containers))
for _, ctr := range p.containers {
ctrs = append(ctrs, ctr)
}
return ctrs, nil
}
// Status gets the status of all containers in the pod
// TODO This should return a summary of the states of all containers in the pod
func (p *Pod) Status() error {
return ErrNotImplemented
}
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