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package libpod
import "github.com/containers/libpod/libpod/config"
// 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
// GetDBConfig retrieves several paths configured within the database
// when it was created - namely, Libpod root and tmp dirs, c/storage
// root and tmp dirs, and c/storage graph driver.
// This is not implemented by the in-memory state, as it has no need to
// validate runtime configuration.
GetDBConfig() (*config.DBConfig, error)
// ValidateDBConfig validates the config in the given Runtime struct
// against paths stored in the configured database.
// Libpod root and tmp dirs and c/storage root and tmp dirs and graph
// driver are validated.
// This is not implemented by the in-memory state, as it has no need to
// validate runtime configuration that may change over multiple runs of
// the program.
ValidateDBConfig(runtime *Runtime) 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 ID from the database by full or partial ID or full
// name.
LookupContainerID(idOrName string) (string, 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)
// Return a container config from the database by full ID
GetContainerConfig(id string) (*ContainerConfig, error)
// PLEASE READ FULL DESCRIPTION BEFORE USING.
// Rewrite a container's configuration.
// This function breaks libpod's normal prohibition on a read-only
// configuration, and as such should be used EXTREMELY SPARINGLY and
// only in very specific circumstances.
// Specifically, it is ONLY safe to use thing function to make changes
// that result in a functionally identical configuration (migrating to
// newer, but identical, configuration fields), or during libpod init
// WHILE HOLDING THE ALIVE LOCK (to prevent other libpod instances from
// being initialized).
// Most things in config can be changed by this, but container ID and
// name ABSOLUTELY CANNOT BE ALTERED. If you do so, there is a high
// potential for database corruption.
// There are a lot of capital letters and conditions here, but the short
// answer is this: use this only very sparingly, and only if you really
// know what you're doing.
RewriteContainerConfig(ctr *Container, newCfg *ContainerConfig) error
// PLEASE READ THE DESCRIPTION FOR RewriteContainerConfig BEFORE USING.
// This function is identical to RewriteContainerConfig, save for the
// fact that it is used with pods instead.
// It is subject to the same conditions as RewriteContainerConfig.
// Please do not use this unless you know what you're doing.
RewritePodConfig(pod *Pod, newCfg *PodConfig) error
// PLEASE READ THE DESCRIPTION FOR RewriteContainerConfig BEFORE USING.
// This function is identical to RewriteContainerConfig, save for the
// fact that it is used with volumes instead.
// It is subject to the same conditions as RewriteContainerConfig.
// The exception is that volumes do not have IDs, so only volume name
// cannot be altered.
// Please do not use this unless you know what you're doing.
RewriteVolumeConfig(volume *Volume, newCfg *VolumeConfig) 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)
// Volume accepts full name of volume
// If the volume doesn't exist, an error will be returned
Volume(volName string) (*Volume, error)
// LookupVolume accepts an unambiguous partial name or full name of a
// volume. Ambiguous names will result in an error.
LookupVolume(name string) (*Volume, error)
// HasVolume returns true if volName exists in the state,
// otherwise it returns false
HasVolume(volName string) (bool, error)
// VolumeInUse goes through the container dependencies of a volume
// and checks if the volume is being used by any container. If it is
// a slice of container IDs using the volume is returned
VolumeInUse(volume *Volume) ([]string, error)
// AddVolume adds the specified volume to state. The volume's name
// must be unique within the list of existing volumes
AddVolume(volume *Volume) error
// RemoveVolume removes the specified volume.
// Only volumes that have no container dependencies can be removed
RemoveVolume(volume *Volume) error
// UpdateVolume updates the volume's state from the database.
UpdateVolume(volume *Volume) error
// SaveVolume saves a volume's state to the database.
SaveVolume(volume *Volume) error
// AllVolumes returns all the volumes available in the state
AllVolumes() ([]*Volume, error)
}
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