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package libpod
import (
"time"
"github.com/containers/storage"
"github.com/pkg/errors"
)
// Pod represents a group of containers that are managed together.
// Any operations on a Pod that access state must begin with a call to
// updatePod().
// There is no guarantee that state exists in a readable state before this call,
// and even if it does its contents will be out of date and must be refreshed
// from the database.
// Generally, this requirement applies only to top-level functions; helpers can
// assume their callers handled this requirement. Generally speaking, if a
// function takes the pod lock and accesses any part of state, it should
// updatePod() immediately after locking.
// ffjson: skip
type Pod struct {
config *PodConfig
state *podState
valid bool
runtime *Runtime
lock storage.Locker
}
// PodConfig represents a pod's static configuration
type PodConfig struct {
ID string `json:"id"`
Name string `json:"name"`
// Namespace the pod is in
Namespace string `json:"namespace,omitempty"`
// Labels contains labels applied to the pod
Labels map[string]string `json:"labels"`
// CgroupParent contains the pod's CGroup parent
CgroupParent string `json:"cgroupParent"`
// UsePodCgroup indicates whether the pod will create its own CGroup and
// join containers to it.
// If true, all containers joined to the pod will use the pod cgroup as
// their cgroup parent, and cannot set a different cgroup parent
UsePodCgroup bool `json:"usePodCgroup"`
// Time pod was created
CreatedTime time.Time `json:"created"`
}
// podState represents a pod's state
type podState struct {
// CgroupPath is the path to the pod's CGroup
CgroupPath string `json:"cgroupPath"`
}
// PodInspect represents the data we want to display for
// podman pod inspect
type PodInspect struct {
Config *PodConfig
State *PodInspectState
Containers []PodContainerInfo
}
// PodInspectState contains inspect data on the pod's state
type PodInspectState struct {
CgroupPath string `json:"cgroupPath"`
}
// PodContainerInfo keeps information on a container in a pod
type PodContainerInfo struct {
ID string `json:"id"`
State string `json:"state"`
}
// ID retrieves the pod's ID
func (p *Pod) ID() string {
return p.config.ID
}
// Name retrieves the pod's name
func (p *Pod) Name() string {
return p.config.Name
}
// Namespace returns the pod's libpod namespace.
// Namespaces are used to logically separate containers and pods in the state.
func (p *Pod) Namespace() string {
return p.config.Namespace
}
// Labels returns the pod's labels
func (p *Pod) Labels() map[string]string {
labels := make(map[string]string)
for key, value := range p.config.Labels {
labels[key] = value
}
return labels
}
// CreatedTime gets the time when the pod was created
func (p *Pod) CreatedTime() time.Time {
return p.config.CreatedTime
}
// CgroupParent returns the pod's CGroup parent
func (p *Pod) CgroupParent() string {
return p.config.CgroupParent
}
// UsePodCgroup returns whether containers in the pod will default to this pod's
// cgroup instead of the default libpod parent
func (p *Pod) UsePodCgroup() bool {
return p.config.UsePodCgroup
}
// CgroupPath returns the path to the pod's CGroup
func (p *Pod) CgroupPath() (string, error) {
p.lock.Lock()
defer p.lock.Unlock()
if err := p.updatePod(); err != nil {
return "", err
}
return p.state.CgroupPath, nil
}
// HasContainer checks if a container is present in the pod
func (p *Pod) HasContainer(id string) (bool, error) {
if !p.valid {
return false, ErrPodRemoved
}
return p.runtime.state.PodHasContainer(p, id)
}
// AllContainersByID returns the container IDs of all the containers in the pod
func (p *Pod) AllContainersByID() ([]string, error) {
p.lock.Lock()
defer p.lock.Unlock()
if !p.valid {
return nil, ErrPodRemoved
}
return p.runtime.state.PodContainersByID(p)
}
// AllContainers retrieves the containers in the pod
func (p *Pod) AllContainers() ([]*Container, error) {
if !p.valid {
return nil, ErrPodRemoved
}
p.lock.Lock()
defer p.lock.Unlock()
return p.allContainers()
}
func (p *Pod) allContainers() ([]*Container, error) {
return p.runtime.state.PodContainers(p)
}
// TODO add pod batching
// Lock pod to avoid lock contention
// Store and lock all containers (no RemoveContainer in batch guarantees cache will not become stale)
// PodContainerStats is an organization struct for pods and their containers
type PodContainerStats struct {
Pod *Pod
ContainerStats map[string]*ContainerStats
}
// GetPodStats returns the stats for each of its containers
func (p *Pod) GetPodStats(previousContainerStats map[string]*ContainerStats) (map[string]*ContainerStats, error) {
var (
ok bool
prevStat *ContainerStats
)
p.lock.Lock()
defer p.lock.Unlock()
if err := p.updatePod(); err != nil {
return nil, err
}
containers, err := p.runtime.state.PodContainers(p)
if err != nil {
return nil, err
}
newContainerStats := make(map[string]*ContainerStats)
for _, c := range containers {
if prevStat, ok = previousContainerStats[c.ID()]; !ok {
prevStat = &ContainerStats{}
}
newStats, err := c.GetContainerStats(prevStat)
// If the container wasn't running, don't include it
// but also suppress the error
if err != nil && errors.Cause(err) != ErrCtrStateInvalid {
return nil, err
}
if err == nil {
newContainerStats[c.ID()] = newStats
}
}
return newContainerStats, nil
}
|
