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018d2c6b1d
Add a mutable state to pods, and database backend sutable for modifying and updating said state. Signed-off-by: Matthew Heon <matthew.heon@gmail.com> Closes: #784 Approved by: rhatdan
76 lines
3.1 KiB
Go
76 lines
3.1 KiB
Go
package libpod
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// State is a storage backend for libpod's current state
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type State interface {
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// Close performs any pre-exit cleanup (e.g. closing database
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// connections) that may be required
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Close() error
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// Refresh clears container and pod states after a reboot
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Refresh() error
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// Return a container from the database from its full ID
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Container(id string) (*Container, error)
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// Return a container from the database by full or partial ID or full
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// name
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LookupContainer(idOrName string) (*Container, error)
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// Check if a container with the given full ID exists in the database
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HasContainer(id string) (bool, error)
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// Adds container to state
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// The container cannot be part of a pod
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// The container must have globally unique name and ID - pod names and
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// IDs also conflict with container names and IDs
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AddContainer(ctr *Container) error
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// Removes container from state
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// Containers that are part of pods must use RemoveContainerFromPod
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RemoveContainer(ctr *Container) error
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// UpdateContainer updates a container's state from the backing store
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UpdateContainer(ctr *Container) error
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// SaveContainer saves a container's current state to the backing store
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SaveContainer(ctr *Container) error
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// ContainerInUse checks if other containers depend upon a given
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// container
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// It returns a slice of the IDs of containers which depend on the given
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// container. If the slice is empty, no container depend on the given
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// container.
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// A container cannot be removed if other containers depend on it
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ContainerInUse(ctr *Container) ([]string, error)
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// Retrieves all containers presently in state
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AllContainers() ([]*Container, error)
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// Accepts full ID of pod
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Pod(id string) (*Pod, error)
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// Accepts full or partial IDs (as long as they are unique) and names
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LookupPod(idOrName string) (*Pod, error)
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// Checks if a pod with the given ID is present in the state
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HasPod(id string) (bool, error)
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// Check if a pod has a container with the given ID
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PodHasContainer(pod *Pod, ctrID string) (bool, error)
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// Get the IDs of all containers in a pod
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PodContainersByID(pod *Pod) ([]string, error)
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// Get all the containers in a pod
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PodContainers(pod *Pod) ([]*Container, error)
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// Adds pod to state
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AddPod(pod *Pod) error
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// Removes pod from state
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// Only empty pods can be removed from the state
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RemovePod(pod *Pod) error
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// Remove all containers from a pod
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// Used to simulataneously remove containers that might otherwise have
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// dependency issues
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// Will fail if a dependency outside the pod is encountered
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RemovePodContainers(pod *Pod) error
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// AddContainerToPod adds a container to an existing pod
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// The container given will be added to the state and the pod
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AddContainerToPod(pod *Pod, ctr *Container) error
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// RemoveContainerFromPod removes a container from an existing pod
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// The container will also be removed from the state
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RemoveContainerFromPod(pod *Pod, ctr *Container) error
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// UpdatePod updates a pod's state from the database
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UpdatePod(pod *Pod) error
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// SavePod saves a pod's state to the database
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SavePod(pod *Pod) error
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// Retrieves all pods presently in state
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AllPods() ([]*Pod, error)
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}
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