container

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 Go to latest Published: Jun 12, 2024 License: Apache-2.0 Imports: 52 Imported by: 1,088

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Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrNameReserved is an error which is returned when a name is requested to be reserved that already is reserved
	ErrNameReserved = errors.New("name is reserved")
	// ErrNameNotReserved is an error which is returned when trying to find a name that is not reserved
	ErrNameNotReserved = errors.New("name is not reserved")
)

Functions

func IsValidHealthString added in v1.13.0 

func IsValidHealthString(s string) bool

IsValidHealthString checks if the provided string is a valid container health status or not.

func IsValidStateString 

func IsValidStateString(s string) bool

IsValidStateString checks if the provided string is a valid container state or not.

func ReplaceOrAppendEnvValues 

func ReplaceOrAppendEnvValues(defaults, overrides []string) []string

ReplaceOrAppendEnvValues returns the defaults with the overrides either replaced by env key or appended to the list

Types

type Container 

type Container struct {
	StreamConfig *stream.Config
	// embed for Container to support states directly.
	*State          `json:"State"` // Needed for Engine API version <= 1.11
	Root            string         `json:"-"` // Path to the "home" of the container, including metadata.
	BaseFS          string         `json:"-"` // Path to the graphdriver mountpoint
	RWLayer         layer.RWLayer  `json:"-"`
	ID              string
	Created         time.Time
	Managed         bool
	Path            string
	Args            []string
	Config          *containertypes.Config
	ImageID         image.ID `json:"Image"`
	ImageManifest   *ocispec.Descriptor
	NetworkSettings *network.Settings
	LogPath         string
	Name            string
	Driver          string
	OS              string

	RestartCount             int
	HasBeenStartedBefore     bool
	HasBeenManuallyStopped   bool // used for unless-stopped restart policy
	HasBeenManuallyRestarted bool `json:"-"` // used to distinguish restart caused by restart policy from the manual one
	MountPoints              map[string]*volumemounts.MountPoint
	HostConfig               *containertypes.HostConfig `json:"-"` // do not serialize the host config in the json, otherwise we'll make the container unportable
	ExecCommands             *ExecStore                 `json:"-"`
	DependencyStore          agentexec.DependencyGetter `json:"-"`
	SecretReferences         []*swarmtypes.SecretReference
	ConfigReferences         []*swarmtypes.ConfigReference
	// logDriver for closing
	LogDriver logger.Logger  `json:"-"`
	LogCopier *logger.Copier `json:"-"`

	// Fields here are specific to Unix platforms
	SecurityOptions
	HostnamePath   string
	HostsPath      string
	ShmPath        string
	ResolvConfPath string

	// Fields here are specific to Windows
	NetworkSharedContainerID string            `json:"-"`
	SharedEndpointList       []string          `json:"-"`
	LocalLogCacheMeta        localLogCacheMeta `json:",omitempty"`
	// contains filtered or unexported fields
}

Container holds the structure defining a container object.

func NewBaseContainer 

func NewBaseContainer(id, root string) *Container

NewBaseContainer creates a new container with its basic configuration.

func (*Container) AddMountPointWithVolume 

func (container *Container) AddMountPointWithVolume(destination string, vol volume.Volume, rw bool)

AddMountPointWithVolume adds a new mount point configured with a volume to the container.

func (*Container) AttachContext 

func (container *Container) AttachContext() context.Context

AttachContext returns the context for attach calls to track container liveness.

func (*Container) BuildHostnameFile 

func (container *Container) BuildHostnameFile() error

BuildHostnameFile writes the container's hostname file.

func (*Container) CancelAttachContext added in v1.11.0 

func (container *Container) CancelAttachContext()

CancelAttachContext cancels attach context. All attach calls should detach after this call.

func (*Container) CheckpointDir added in v1.13.0 

func (container *Container) CheckpointDir() string

CheckpointDir returns the directory checkpoints are stored in

func (*Container) CheckpointTo 

func (container *Container) CheckpointTo(store *ViewDB) error

CheckpointTo makes the Container's current state visible to queries, and persists state. Callers must hold a Container lock.

func (*Container) CloseStreams added in v1.12.5 

func (container *Container) CloseStreams() error

CloseStreams closes the container's stdio streams

func (*Container) CommitInMemory 

func (container *Container) CommitInMemory(store *ViewDB) error

CommitInMemory makes the Container's current state visible to queries, but does not persist state.

Callers must hold a Container lock.

func (*Container) ConfigFilePath 

func (container *Container) ConfigFilePath(configRef swarmtypes.ConfigReference) (string, error)

ConfigFilePath returns the path to the on-disk location of a config. On unix, configs are always considered secret

func (*Container) ConfigPath 

func (container *Container) ConfigPath() (string, error)

ConfigPath returns the path to the container's JSON config

func (*Container) CopyImagePathContent 

func (container *Container) CopyImagePathContent(volumePath, destination string) error

CopyImagePathContent copies files in destination to the volume.

func (*Container) CreateDaemonEnvironment 

func (container *Container) CreateDaemonEnvironment(tty bool, linkedEnv []string) []string

CreateDaemonEnvironment creates a new environment variable slice for this container.

func (*Container) DetachAndUnmount added in v1.13.0 

func (container *Container) DetachAndUnmount(volumeEventLog func(name string, action events.Action, attributes map[string]string)) error

DetachAndUnmount uses a detached mount on all mount destinations, then unmounts each volume normally. This is used from daemon/archive for `docker cp`

func (*Container) ExitOnNext 

func (container *Container) ExitOnNext()

ExitOnNext signals to the monitor that it should not restart the container after we send the kill signal.

func (*Container) FromDisk 

func (container *Container) FromDisk() error

FromDisk loads the container configuration stored in the host.

func (*Container) FullHostname added in v1.11.0 

func (container *Container) FullHostname() string

FullHostname returns hostname and optional domain appended to it.

func (*Container) GetExecIDs 

func (container *Container) GetExecIDs() []string

GetExecIDs returns the list of exec commands running on the container.

func (*Container) GetMountLabel 

func (container *Container) GetMountLabel() string

GetMountLabel returns the mounting label for the container. This label is empty if the container is privileged.

func (*Container) GetMountPoints 

func (container *Container) GetMountPoints() []types.MountPoint

GetMountPoints gives a platform specific transformation to types.MountPoint. Callers must hold a Container lock.

func (*Container) GetProcessLabel 

func (container *Container) GetProcessLabel() string

GetProcessLabel returns the process label for the container.

func (*Container) GetResourcePath 

func (container *Container) GetResourcePath(path string) (string, error)

GetResourcePath evaluates `path` in the scope of the container's BaseFS, with proper path sanitisation. Symlinks are all scoped to the BaseFS of the container, as though the container's BaseFS was `/`.

The BaseFS of a container is the host-facing path which is bind-mounted as `/` inside the container. This method is essentially used to access a particular path inside the container as though you were a process in that container.

# NOTE The returned path is *only* safely scoped inside the container's BaseFS if no component of the returned path changes (such as a component symlinking to a different path) between using this method and using the path. See symlink.FollowSymlinkInScope for more details.

func (*Container) GetRootResourcePath 

func (container *Container) GetRootResourcePath(path string) (string, error)

GetRootResourcePath evaluates `path` in the scope of the container's root, with proper path sanitisation. Symlinks are all scoped to the root of the container, as though the container's root was `/`.

The root of a container is the host-facing configuration metadata directory. Only use this method to safely access the container's `container.json` or other metadata files. If in doubt, use container.GetResourcePath.

# NOTE The returned path is *only* safely scoped inside the container's root if no component of the returned path changes (such as a component symlinking to a different path) between using this method and using the path. See symlink.FollowSymlinkInScope for more details.

func (*Container) GetRunningTask 

func (container *Container) GetRunningTask() (libcontainerdtypes.Task, error)

GetRunningTask asserts that the container is running and returns the Task for the container. An errdefs.Conflict error is returned if the container is not in the Running state.

A system error is returned if container is in a bad state: Running is true but has a nil Task.

The container lock must be held when calling this method.

func (*Container) HasMountFor 

func (container *Container) HasMountFor(path string) bool

HasMountFor checks if path is a mountpoint

func (*Container) HostConfigPath 

func (container *Container) HostConfigPath() (string, error)

HostConfigPath returns the path to the container's JSON hostconfig

func (*Container) InitDNSHostConfig 

func (container *Container) InitDNSHostConfig()

InitDNSHostConfig ensures that the dns fields are never nil. New containers don't ever have those fields nil, but pre created containers can still have those nil values. The non-recommended host configuration in the start api can make these fields nil again, this corrects that issue until we remove that behavior for good. See https://github.com/docker/docker/pull/17779 for a more detailed explanation on why we don't want that.

func (*Container) InitializeStdio added in v1.12.4 

func (container *Container) InitializeStdio(iop *cio.DirectIO) (cio.IO, error)

InitializeStdio is called by libcontainerd to connect the stdio.

func (*Container) IpcMounts 

func (container *Container) IpcMounts() []Mount

IpcMounts returns the list of IPC mounts

func (*Container) IsDestinationMounted 

func (container *Container) IsDestinationMounted(destination string) bool

IsDestinationMounted checks whether a path is mounted on the container or not.

func (*Container) MountsResourcePath 

func (container *Container) MountsResourcePath(mount string) (string, error)

MountsResourcePath returns the path where mounts are stored for the given mount

func (*Container) NetworkMounts 

func (container *Container) NetworkMounts() []Mount

NetworkMounts returns the list of network mounts.

func (*Container) Reset added in v1.11.0 

func (container *Container) Reset(lock bool)

Reset puts a container into a state where it can be restarted again.

func (*Container) ResetRestartManager added in v1.13.0 

func (container *Container) ResetRestartManager(resetCount bool)

ResetRestartManager initializes new restartmanager based on container config

func (*Container) RestartManager added in v1.11.0 

func (container *Container) RestartManager() *restartmanager.RestartManager

RestartManager returns the current restartmanager instance connected to container.

func (*Container) RestoreTask 

func (container *Container) RestoreTask(ctx context.Context, client libcontainerdtypes.Client) error

RestoreTask restores the containerd container and task handles and reattaches the IO for the running task. Container state is not synced with containerd's state.

An errdefs.NotFound error is returned if the container does not exist in containerd. However, a nil error is returned if the task does not exist in containerd.

func (*Container) SecretFilePath 

func (container *Container) SecretFilePath(secretRef swarmtypes.SecretReference) (string, error)

SecretFilePath returns the path to the location of a secret on the host.

func (*Container) SecretMountPath added in v1.13.0 

func (container *Container) SecretMountPath() (string, error)

SecretMountPath returns the path of the secret mount for the container

func (*Container) SecretMounts 

func (container *Container) SecretMounts() ([]Mount, error)

SecretMounts returns the mounts for the secret path.

func (*Container) SetupWorkingDirectory 

func (container *Container) SetupWorkingDirectory(rootIdentity idtools.Identity) error

SetupWorkingDirectory sets up the container's working directory as set in container.Config.WorkingDir

func (*Container) ShmResourcePath 

func (container *Container) ShmResourcePath() (string, error)

ShmResourcePath returns path to shm

func (*Container) ShouldRestart 

func (container *Container) ShouldRestart() bool

ShouldRestart decides whether the daemon should restart the container or not. This is based on the container's restart policy.

func (*Container) StartLogger 

func (container *Container) StartLogger() (logger.Logger, error)

StartLogger starts a new logger driver for the container.

func (*Container) StderrPipe added in v1.12.5 

func (container *Container) StderrPipe() io.ReadCloser

StderrPipe gets the stderr stream of the container

func (*Container) StdinPipe added in v1.12.5 

func (container *Container) StdinPipe() io.WriteCloser

StdinPipe gets the stdin stream of the container

func (*Container) StdoutPipe added in v1.12.5 

func (container *Container) StdoutPipe() io.ReadCloser

StdoutPipe gets the stdout stream of the container

func (*Container) StopSignal 

func (container *Container) StopSignal() syscall.Signal

StopSignal returns the signal used to stop the container.

func (*Container) StopTimeout added in v1.13.0 

func (container *Container) StopTimeout() int

StopTimeout returns the timeout (in seconds) used to stop the container.

func (*Container) TmpfsMounts 

func (container *Container) TmpfsMounts() ([]Mount, error)

TmpfsMounts returns the list of tmpfs mounts

func (*Container) TrySetNetworkMount 

func (container *Container) TrySetNetworkMount(destination string, path string) bool

TrySetNetworkMount attempts to set the network mounts given a provided destination and the path to use for it; return true if the given destination was a network mount file

func (*Container) UnmountIpcMount 

func (container *Container) UnmountIpcMount() error

UnmountIpcMount unmounts shm if it was mounted

func (*Container) UnmountSecrets added in v1.13.0 

func (container *Container) UnmountSecrets() error

UnmountSecrets unmounts the local tmpfs for secrets

func (*Container) UnmountVolumes 

func (container *Container) UnmountVolumes(ctx context.Context, volumeEventLog func(name string, action events.Action, attributes map[string]string)) error

UnmountVolumes unmounts all volumes

func (*Container) UpdateContainer 

func (container *Container) UpdateContainer(hostConfig *containertypes.HostConfig) error

UpdateContainer updates configuration of a container. Callers must hold a Lock on the Container.

func (*Container) UpdateMonitor added in v1.11.0 

func (container *Container) UpdateMonitor(restartPolicy containertypes.RestartPolicy)

UpdateMonitor updates monitor configure for running container

func (*Container) WriteHostConfig 

func (container *Container) WriteHostConfig() (*containertypes.HostConfig, error)

WriteHostConfig saves the host configuration on disk for the container, and returns a deep copy of the saved object. Callers must hold a Container lock.

type ExecConfig 

type ExecConfig struct {
	sync.Mutex
	Started      chan struct{}
	StreamConfig *stream.Config
	ID           string
	Running      bool
	ExitCode     *int
	OpenStdin    bool
	OpenStderr   bool
	OpenStdout   bool
	CanRemove    bool
	Container    *Container
	DetachKeys   []byte
	Entrypoint   string
	Args         []string
	Tty          bool
	Privileged   bool
	User         string
	WorkingDir   string
	Env          []string
	Process      types.Process
	ConsoleSize  *[2]uint
}

ExecConfig holds the configurations for execs. The Daemon keeps track of both running and finished execs so that they can be examined both during and after completion.

func NewExecConfig 

func NewExecConfig(c *Container) *ExecConfig

NewExecConfig initializes the a new exec configuration

func (*ExecConfig) CloseStreams 

func (c *ExecConfig) CloseStreams() error

CloseStreams closes the stdio streams for the exec

func (*ExecConfig) InitializeStdio 

func (c *ExecConfig) InitializeStdio(iop *cio.DirectIO) (cio.IO, error)

InitializeStdio is called by libcontainerd to connect the stdio.

func (*ExecConfig) SetExitCode 

func (c *ExecConfig) SetExitCode(code int)

SetExitCode sets the exec config's exit code

type ExecStore 

type ExecStore struct {
	// contains filtered or unexported fields
}

ExecStore keeps track of the exec configurations.

func NewExecStore 

func NewExecStore() *ExecStore

NewExecStore initializes a new exec store.

func (*ExecStore) Add 

func (e *ExecStore) Add(id string, Config *ExecConfig)

Add adds a new exec configuration to the store.

func (*ExecStore) Commands 

func (e *ExecStore) Commands() map[string]*ExecConfig

Commands returns the exec configurations in the store.

func (*ExecStore) Delete 

func (e *ExecStore) Delete(id string)

Delete removes an exec configuration from the store.

func (*ExecStore) Get 

func (e *ExecStore) Get(id string) *ExecConfig

Get returns an exec configuration by its id.

func (*ExecStore) List 

func (e *ExecStore) List() []string

List returns the list of exec ids in the store.

type ExitStatus added in v1.11.0 

type ExitStatus struct {
	// The exit code with which the container exited.
	ExitCode int

	// Time at which the container died
	ExitedAt time.Time
}

ExitStatus provides exit reasons for a container.

type Health added in v1.12.0 

type Health struct {
	types.Health
	// contains filtered or unexported fields
}

Health holds the current container health-check state

func (*Health) CloseMonitorChannel added in v1.12.0 

func (s *Health) CloseMonitorChannel()

CloseMonitorChannel closes any existing monitor channel.

func (*Health) OpenMonitorChannel added in v1.12.0 

func (s *Health) OpenMonitorChannel() chan struct{}

OpenMonitorChannel creates and returns a new monitor channel. If there already is one, it returns nil.

func (*Health) SetStatus 

func (s *Health) SetStatus(new string)

SetStatus writes the current status to the underlying health structure, obeying the locking semantics.

Status may be set directly if another lock is used.

func (*Health) Status 

func (s *Health) Status() string

Status returns the current health status.

Note that this takes a lock and the value may change after being read.

func (*Health) String added in v1.12.0 

func (s *Health) String() string

String returns a human-readable description of the health-check state

type History 

type History []*Container

History is a convenience type for storing a list of containers, sorted by creation date in descendant order.

func (*History) Len 

func (history *History) Len() int

Len returns the number of containers in the history.

func (*History) Less 

func (history *History) Less(i, j int) bool

Less compares two containers and returns true if the second one was created before the first one.

func (*History) Swap 

func (history *History) Swap(i, j int)

Swap switches containers i and j positions in the history.

type Mount added in v1.11.0 

type Mount struct {
	Source                 string `json:"source"`
	Destination            string `json:"destination"`
	Writable               bool   `json:"writable"`
	Data                   string `json:"data"`
	Propagation            string `json:"mountpropagation"`
	NonRecursive           bool   `json:"nonrecursive"`
	ReadOnlyNonRecursive   bool   `json:"readonlynonrecursive"`
	ReadOnlyForceRecursive bool   `json:"readonlyforcerecursive"`
}

Mount contains information for a mount operation.

type SecurityOptions 

type SecurityOptions struct {
	// MountLabel contains the options for the "mount" command.
	MountLabel      string
	ProcessLabel    string
	AppArmorProfile string
	SeccompProfile  string
	NoNewPrivileges bool
}

type Snapshot 

type Snapshot struct {
	types.Container

	// additional info queries need to filter on
	// preserve nanosec resolution for queries
	CreatedAt    time.Time
	StartedAt    time.Time
	Name         string
	Pid          int
	ExitCode     int
	Running      bool
	Paused       bool
	Managed      bool
	ExposedPorts nat.PortSet
	PortBindings nat.PortSet
	Health       string
	HostConfig   struct {
		Isolation string
	}
}

Snapshot is a read only view for Containers. It holds all information necessary to serve container queries in a versioned ACID in-memory store.

type State 

type State struct {
	sync.Mutex
	// Note that `Running` and `Paused` are not mutually exclusive:
	// When pausing a container (on Linux), the freezer cgroup is used to suspend
	// all processes in the container. Freezing the process requires the process to
	// be running. As a result, paused containers are both `Running` _and_ `Paused`.
	Running           bool
	Paused            bool
	Restarting        bool
	OOMKilled         bool
	RemovalInProgress bool // Not need for this to be persistent on disk.
	Dead              bool
	Pid               int
	ExitCodeValue     int    `json:"ExitCode"`
	ErrorMsg          string `json:"Error"` // contains last known error during container start, stop, or remove
	StartedAt         time.Time
	FinishedAt        time.Time
	Health            *Health
	Removed           bool `json:"-"`
	// contains filtered or unexported fields
}

State holds the current container state, and has methods to get and set the state. Container has an embed, which allows all of the functions defined against State to run against Container.

func NewState 

func NewState() *State

NewState creates a default state object.

func (*State) C8dContainer 

func (s *State) C8dContainer() (_ libcontainerdtypes.Container, ok bool)

C8dContainer returns a reference to the libcontainerd Container object for the container and whether the reference is valid.

The container lock must be held when calling this method.

func (*State) Err 

func (s *State) Err() error

Err returns an error if there is one.

func (*State) ExitCode 

func (s *State) ExitCode() int

ExitCode returns current exitcode for the state. Take lock before if state may be shared.

func (*State) GetPID 

func (s *State) GetPID() int

GetPID holds the process id of a container.

func (*State) IsDead 

func (s *State) IsDead() bool

IsDead returns whether the Dead flag is set. Used by Container to check whether a container is dead.

func (*State) IsPaused 

func (s *State) IsPaused() bool

IsPaused returns whether the container is paused or not.

func (*State) IsRemovalInProgress 

func (s *State) IsRemovalInProgress() bool

IsRemovalInProgress returns whether the RemovalInProgress flag is set. Used by Container to check whether a container is being removed.

func (*State) IsRestarting 

func (s *State) IsRestarting() bool

IsRestarting returns whether the container is restarting or not.

func (*State) IsRunning 

func (s *State) IsRunning() bool

IsRunning returns whether the running flag is set. Used by Container to check whether a container is running.

func (*State) ResetRemovalInProgress 

func (s *State) ResetRemovalInProgress()

ResetRemovalInProgress makes the RemovalInProgress state to false.

func (*State) SetError 

func (s *State) SetError(err error)

SetError sets the container's error state. This is useful when we want to know the error that occurred when container transits to another state when inspecting it

func (*State) SetExitCode added in v1.12.0 

func (s *State) SetExitCode(ec int)

SetExitCode sets current exitcode for the state. Take lock before if state may be shared.

func (*State) SetRemovalError 

func (s *State) SetRemovalError(err error)

SetRemovalError is to be called in case a container remove failed. It sets an error and notifies all waiters.

func (*State) SetRemovalInProgress 

func (s *State) SetRemovalInProgress() bool

SetRemovalInProgress sets the container state as being removed. It returns true if the container was already in that state.

func (*State) SetRemoved 

func (s *State) SetRemoved()

SetRemoved assumes this container is already in the "dead" state and notifies all waiters.

func (*State) SetRestarting 

func (s *State) SetRestarting(exitStatus *ExitStatus)

SetRestarting sets the container state to "restarting" without locking. It also sets the container PID to 0.

func (*State) SetRunning 

func (s *State) SetRunning(ctr libcontainerdtypes.Container, tsk libcontainerdtypes.Task, start time.Time)

SetRunning sets the running state along with StartedAt time.

func (*State) SetRunningExternal 

func (s *State) SetRunningExternal(ctr libcontainerdtypes.Container, tsk libcontainerdtypes.Task)

SetRunningExternal sets the running state without setting the `StartedAt` time (used for containers not started by Docker instead of SetRunning).

func (*State) SetStopped 

func (s *State) SetStopped(exitStatus *ExitStatus)

SetStopped sets the container state to "stopped" without locking.

func (*State) StateString 

func (s *State) StateString() string

StateString returns a single string to describe state

func (*State) String 

func (s *State) String() string

String returns a human-readable description of the state

func (*State) Task 

func (s *State) Task() (_ libcontainerdtypes.Task, ok bool)

Task returns a reference to the libcontainerd Task object for the container and whether the reference is valid.

The container lock must be held when calling this method.

See also: (*Container).GetRunningTask().

func (*State) Wait 

func (s *State) Wait(ctx context.Context, condition WaitCondition) <-chan StateStatus

Wait waits until the container is in a certain state indicated by the given condition. A context must be used for cancelling the request, controlling timeouts, and avoiding goroutine leaks. Wait must be called without holding the state lock. Returns a channel from which the caller will receive the result. If the container exited on its own, the result's Err() method will be nil and its ExitCode() method will return the container's exit code, otherwise, the results Err() method will return an error indicating why the wait operation failed.

type StateStatus added in v1.13.0 

type StateStatus struct {
	// contains filtered or unexported fields
}

StateStatus is used to return container wait results. Implements exec.ExitCode interface. This type is needed as State include a sync.Mutex field which make copying it unsafe.

func (StateStatus) Err 

func (s StateStatus) Err() error

Err returns current error for the state. Returns nil if the container had exited on its own.

func (StateStatus) ExitCode added in v1.13.0 

func (s StateStatus) ExitCode() int

ExitCode returns current exitcode for the state.

type Store 

type Store interface {
	// Add appends a new container to the store.
	Add(string, *Container)
	// Get returns a container from the store by the identifier it was stored with.
	Get(string) *Container
	// Delete removes a container from the store by the identifier it was stored with.
	Delete(string)
	// List returns a list of containers from the store.
	List() []*Container
	// Size returns the number of containers in the store.
	Size() int
	// First returns the first container found in the store by a given filter.
	First(StoreFilter) *Container
	// ApplyAll calls the reducer function with every container in the store.
	ApplyAll(StoreReducer)
}

Store defines an interface that any container store must implement.

func NewMemoryStore 

func NewMemoryStore() Store

NewMemoryStore initializes a new memory store.

type StoreFilter 

type StoreFilter func(*Container) bool

StoreFilter defines a function to filter container in the store.

type StoreReducer 

type StoreReducer func(*Container)

StoreReducer defines a function to manipulate containers in the store

type View 

type View struct {
	// contains filtered or unexported fields
}

View provides a consistent read-only view of the database.

func (*View) All 

func (v *View) All() ([]Snapshot, error)

All returns a all items in this snapshot. Returned objects must never be modified.

func (*View) Get 

func (v *View) Get(id string) (*Snapshot, error)

Get returns an item by id. Returned objects must never be modified.

func (*View) GetAllNames 

func (v *View) GetAllNames() map[string][]string

GetAllNames returns all registered names.

func (*View) GetID 

func (v *View) GetID(name string) (string, error)

GetID returns the container ID that the passed in name is reserved to.

type ViewDB 

type ViewDB struct {
	// contains filtered or unexported fields
}

ViewDB provides an in-memory transactional (ACID) container store.

func NewViewDB 

func NewViewDB() (*ViewDB, error)

NewViewDB provides the default implementation, with the default schema

func (*ViewDB) Delete 

func (db *ViewDB) Delete(c *Container) error

Delete removes an item by ID

func (*ViewDB) GetByPrefix 

func (db *ViewDB) GetByPrefix(s string) (string, error)

GetByPrefix returns a container with the given ID prefix. It returns an error if an empty prefix was given or if multiple containers match the prefix.

func (*ViewDB) ReleaseName 

func (db *ViewDB) ReleaseName(name string) error

ReleaseName releases the reserved name Once released, a name can be reserved again

func (*ViewDB) ReserveName 

func (db *ViewDB) ReserveName(name, containerID string) error

ReserveName registers a container ID to a name ReserveName is idempotent Attempting to reserve a container ID to a name that already exists results in an `ErrNameReserved` A name reservation is globally unique

func (*ViewDB) Save 

func (db *ViewDB) Save(c *Container) error

Save atomically updates the in-memory store state for a Container. Only read only (deep) copies of containers may be passed in.

func (*ViewDB) Snapshot 

func (db *ViewDB) Snapshot() *View

Snapshot provides a consistent read-only view of the database.

type WaitCondition 

type WaitCondition int

WaitCondition is an enum type for different states to wait for. 

const (
	WaitConditionNotRunning WaitCondition = iota
	WaitConditionNextExit
	WaitConditionRemoved
)

Possible WaitCondition Values.

WaitConditionNotRunning (default) is used to wait for any of the non-running states: "created", "exited", "dead", "removing", or "removed".

WaitConditionNextExit is used to wait for the next time the state changes to a non-running state. If the state is currently "created" or "exited", this would cause Wait() to block until either the container runs and exits or is removed.

WaitConditionRemoved is used to wait for the container to be removed.

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