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package libpod
// State is a storage backend for libpod's current state.
// A State is only initialized once per instance of libpod.
// As such, initialization methods for State implementations may safely assume
// they will be run as a singleton.
// For all container and pod retrieval methods, a State must retrieve the
// Configuration struct of the container or pod and include it in the returned
// struct. The State of the container or pod may optionally be included as well,
// but this is not a requirement.
// As such, all containers and pods must be synced with the database via the
// UpdateContainer and UpdatePod calls before any state-specific information is
// retrieved after they are pulled from the database.
// Generally speaking, the syncContainer() call should be run at the beginning
// of all API operations, which will silently handle this.
type State interface {
// Close performs any pre-exit cleanup (e.g. closing database
// connections) that may be required
Close() error
// Refresh clears container and pod states after a reboot
Refresh() error
// SetNamespace() sets the namespace for the store, and will determine
// what containers are retrieved with container and pod retrieval calls.
// A namespace of "", the empty string, acts as no namespace, and
// containers and pods in all namespaces will be returned.
SetNamespace(ns string) error
// Return a container from the database from its full ID.
// If the container is not in the set namespace, an error will be
// returned.
Container(id string) (*Container, error)
// Return a container from the database by full or partial ID or full
// name.
// Containers not in the set namespace will be ignored.
LookupContainer(idOrName string) (*Container, error)
// Check if a container with the given full ID exists in the database.
// If the container exists but is not in the set namespace, false will
// be returned.
HasContainer(id string) (bool, error)
// Adds container to state.
// The container cannot be part of a pod.
// The container must have globally unique name and ID - pod names and
// IDs also conflict with container names and IDs.
// The container must be in the set namespace if a namespace has been
// set.
// All containers this container depends on must be part of the same
// namespace and must not be joined to a pod.
AddContainer(ctr *Container) error
// Removes container from state.
// Containers that are part of pods must use RemoveContainerFromPod.
// The container must be part of the set namespace.
RemoveContainer(ctr *Container) error
// UpdateContainer updates a container's state from the backing store.
// The container must be part of the set namespace.
UpdateContainer(ctr *Container) error
// SaveContainer saves a container's current state to the backing store.
// The container must be part of the set namespace.
SaveContainer(ctr *Container) error
// ContainerInUse checks if other containers depend upon a given
// container.
// It returns a slice of the IDs of containers which depend on the given
// container. If the slice is empty, no container depend on the given
// container.
// A container cannot be removed if other containers depend on it.
// The container being checked must be part of the set namespace.
ContainerInUse(ctr *Container) ([]string, error)
// Retrieves all containers presently in state.
// If a namespace is set, only containers within the namespace will be
// returned.
AllContainers() ([]*Container, error)
// Accepts full ID of pod.
// If the pod given is not in the set namespace, an error will be
// returned.
Pod(id string) (*Pod, error)
// Accepts full or partial IDs (as long as they are unique) and names.
// Pods not in the set namespace are ignored.
LookupPod(idOrName string) (*Pod, error)
// Checks if a pod with the given ID is present in the state.
// If the given pod is not in the set namespace, false is returned.
HasPod(id string) (bool, error)
// Check if a pod has a container with the given ID.
// The pod must be part of the set namespace.
PodHasContainer(pod *Pod, ctrID string) (bool, error)
// Get the IDs of all containers in a pod.
// The pod must be part of the set namespace.
PodContainersByID(pod *Pod) ([]string, error)
// Get all the containers in a pod.
// The pod must be part of the set namespace.
PodContainers(pod *Pod) ([]*Container, error)
// Adds pod to state.
// The pod must be part of the set namespace.
// The pod's name and ID must be globally unique.
AddPod(pod *Pod) error
// Removes pod from state.
// Only empty pods can be removed from the state.
// The pod must be part of the set namespace.
RemovePod(pod *Pod) error
// Remove all containers from a pod.
// Used to simultaneously remove containers that might otherwise have
// dependency issues.
// Will fail if a dependency outside the pod is encountered.
// The pod must be part of the set namespace.
RemovePodContainers(pod *Pod) error
// AddContainerToPod adds a container to an existing pod.
// The container given will be added to the state and the pod.
// The container and its dependencies must be part of the given pod,
// and the given pod's namespace.
// The pod must be part of the set namespace.
// The pod must already exist in the state.
// The container's name and ID must be globally unique.
AddContainerToPod(pod *Pod, ctr *Container) error
// RemoveContainerFromPod removes a container from an existing pod.
// The container will also be removed from the state.
// The container must be in the given pod, and the pod must be in the
// set namespace.
RemoveContainerFromPod(pod *Pod, ctr *Container) error
// UpdatePod updates a pod's state from the database.
// The pod must be in the set namespace.
UpdatePod(pod *Pod) error
// SavePod saves a pod's state to the database.
// The pod must be in the set namespace.
SavePod(pod *Pod) error
// Retrieves all pods presently in state.
// If a namespace has been set, only pods in that namespace will be
// returned.
AllPods() ([]*Pod, error)
}
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