package libpod import ( "strings" "github.com/containers/libpod/pkg/registrar" "github.com/containers/storage/pkg/truncindex" "github.com/pkg/errors" ) // TODO: Maybe separate idIndex for pod/containers // As of right now, partial IDs used in Lookup... need to be unique as well // This may be undesirable? // An InMemoryState is a purely in-memory state store type InMemoryState struct { // Maps pod ID to pod struct. pods map[string]*Pod // Maps container ID to container struct. containers map[string]*Container volumes map[string]*Volume // Maps container ID to a list of IDs of dependencies. ctrDepends map[string][]string volumeDepends map[string][]string // Maps pod ID to a map of container ID to container struct. podContainers map[string]map[string]*Container // Global name registry - ensures name uniqueness and performs lookups. nameIndex *registrar.Registrar // Global ID registry - ensures ID uniqueness and performs lookups. idIndex *truncindex.TruncIndex // Namespace the state is joined to. namespace string // Maps namespace name to local ID and name registries for looking up // pods and containers in a specific namespace. namespaceIndexes map[string]*namespaceIndex } // namespaceIndex contains name and ID registries for a specific namespace. // This is used for namespaces lookup operations. type namespaceIndex struct { nameIndex *registrar.Registrar idIndex *truncindex.TruncIndex } // NewInMemoryState initializes a new, empty in-memory state func NewInMemoryState() (State, error) { state := new(InMemoryState) state.pods = make(map[string]*Pod) state.containers = make(map[string]*Container) state.volumes = make(map[string]*Volume) state.ctrDepends = make(map[string][]string) state.volumeDepends = make(map[string][]string) state.podContainers = make(map[string]map[string]*Container) state.nameIndex = registrar.NewRegistrar() state.idIndex = truncindex.NewTruncIndex([]string{}) state.namespace = "" state.namespaceIndexes = make(map[string]*namespaceIndex) return state, nil } // Close the state before shutdown // This is a no-op as we have no backing disk func (s *InMemoryState) Close() error { return nil } // Refresh clears container and pod stats after a reboot // In-memory state won't survive a reboot so this is a no-op func (s *InMemoryState) Refresh() error { return nil } // GetDBConfig is not implemented for in-memory state. // As we do not store a config, return an empty one. func (s *InMemoryState) GetDBConfig() (*DBConfig, error) { return &DBConfig{}, nil } // ValidateDBConfig is not implemented for the in-memory state. // Since we do nothing just return no error. func (s *InMemoryState) ValidateDBConfig(runtime *Runtime) error { return nil } // SetNamespace sets the namespace for container and pod retrieval. func (s *InMemoryState) SetNamespace(ns string) error { s.namespace = ns return nil } // Container retrieves a container from its full ID func (s *InMemoryState) Container(id string) (*Container, error) { if id == "" { return nil, ErrEmptyID } ctr, ok := s.containers[id] if !ok { return nil, errors.Wrapf(ErrNoSuchCtr, "no container with ID %s found", id) } if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return nil, err } return ctr, nil } // LookupContainer retrieves a container by full ID, unique partial ID, or name func (s *InMemoryState) LookupContainer(idOrName string) (*Container, error) { var ( nameIndex *registrar.Registrar idIndex *truncindex.TruncIndex ) if idOrName == "" { return nil, ErrEmptyID } if s.namespace != "" { nsIndex, ok := s.namespaceIndexes[s.namespace] if !ok { // We have no containers in the namespace // Return false return nil, errors.Wrapf(ErrNoSuchCtr, "no container found with name or ID %s", idOrName) } nameIndex = nsIndex.nameIndex idIndex = nsIndex.idIndex } else { nameIndex = s.nameIndex idIndex = s.idIndex } fullID, err := nameIndex.Get(idOrName) if err != nil { if err == registrar.ErrNameNotReserved { // What was passed is not a name, assume it's an ID fullID, err = idIndex.Get(idOrName) if err != nil { if err == truncindex.ErrNotExist { return nil, errors.Wrapf(ErrNoSuchCtr, "no container found with name or ID %s", idOrName) } return nil, errors.Wrapf(err, "error performing truncindex lookup for ID %s", idOrName) } } else { return nil, errors.Wrapf(err, "error performing registry lookup for ID %s", idOrName) } } ctr, ok := s.containers[fullID] if !ok { // It's a pod, not a container return nil, errors.Wrapf(ErrNoSuchCtr, "name or ID %s is a pod, not a container", idOrName) } return ctr, nil } // HasContainer checks if a container with the given ID is present in the state func (s *InMemoryState) HasContainer(id string) (bool, error) { if id == "" { return false, ErrEmptyID } ctr, ok := s.containers[id] if !ok || (s.namespace != "" && s.namespace != ctr.config.Namespace) { return false, nil } return true, nil } // AddContainer adds a container to the state // Containers in a pod cannot be added to the state func (s *InMemoryState) AddContainer(ctr *Container) error { if !ctr.valid { return errors.Wrapf(ErrCtrRemoved, "container with ID %s is not valid", ctr.ID()) } if _, ok := s.containers[ctr.ID()]; ok { return errors.Wrapf(ErrCtrExists, "container with ID %s already exists in state", ctr.ID()) } if ctr.config.Pod != "" { return errors.Wrapf(ErrInvalidArg, "cannot add a container that is in a pod with AddContainer, use AddContainerToPod") } if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return err } // There are potential race conditions with this // But in-memory state is intended purely for testing and not production // use, so this should be fine. depCtrs := ctr.Dependencies() for _, depID := range depCtrs { depCtr, ok := s.containers[depID] if !ok { return errors.Wrapf(ErrNoSuchCtr, "cannot depend on nonexistent container %s", depID) } else if depCtr.config.Pod != "" { return errors.Wrapf(ErrInvalidArg, "cannot depend on container in a pod if not part of same pod") } if depCtr.config.Namespace != ctr.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %s and cannot depend on container %s in namespace %s", ctr.ID(), ctr.config.Namespace, depID, depCtr.config.Namespace) } } if err := s.nameIndex.Reserve(ctr.Name(), ctr.ID()); err != nil { return errors.Wrapf(err, "error registering container name %s", ctr.Name()) } if err := s.idIndex.Add(ctr.ID()); err != nil { s.nameIndex.Release(ctr.Name()) return errors.Wrapf(err, "error registering container ID %s", ctr.ID()) } s.containers[ctr.ID()] = ctr // If we're in a namespace, add us to that namespace's indexes if ctr.config.Namespace != "" { var nsIndex *namespaceIndex nsIndex, ok := s.namespaceIndexes[ctr.config.Namespace] if !ok { nsIndex = new(namespaceIndex) nsIndex.nameIndex = registrar.NewRegistrar() nsIndex.idIndex = truncindex.NewTruncIndex([]string{}) s.namespaceIndexes[ctr.config.Namespace] = nsIndex } // Should be no errors here, the previous index adds should have caught that if err := nsIndex.nameIndex.Reserve(ctr.Name(), ctr.ID()); err != nil { return errors.Wrapf(err, "error registering container name %s", ctr.Name()) } if err := nsIndex.idIndex.Add(ctr.ID()); err != nil { return errors.Wrapf(err, "error registering container ID %s", ctr.ID()) } } // Add containers this container depends on for _, depCtr := range depCtrs { s.addCtrToDependsMap(ctr.ID(), depCtr) } // Add container to volume dependencies for _, vol := range ctr.config.Spec.Mounts { if strings.Contains(vol.Source, ctr.runtime.config.VolumePath) { volName := strings.Split(vol.Source[len(ctr.runtime.config.VolumePath)+1:], "/")[0] s.addCtrToVolDependsMap(ctr.ID(), volName) } } return nil } // RemoveContainer removes a container from the state // The container will only be removed from the state, not from the pod the container belongs to func (s *InMemoryState) RemoveContainer(ctr *Container) error { // Almost no validity checks are performed, to ensure we can kick // misbehaving containers out of the state if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return err } // Ensure we don't remove a container which other containers depend on deps, ok := s.ctrDepends[ctr.ID()] if ok && len(deps) != 0 { depsStr := strings.Join(deps, ", ") return errors.Wrapf(ErrCtrExists, "the following containers depend on container %s: %s", ctr.ID(), depsStr) } if _, ok := s.containers[ctr.ID()]; !ok { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "no container exists in state with ID %s", ctr.ID()) } if err := s.idIndex.Delete(ctr.ID()); err != nil { return errors.Wrapf(err, "error removing container ID from index") } delete(s.containers, ctr.ID()) s.nameIndex.Release(ctr.Name()) delete(s.ctrDepends, ctr.ID()) if ctr.config.Namespace != "" { nsIndex, ok := s.namespaceIndexes[ctr.config.Namespace] if !ok { return errors.Wrapf(ErrInternal, "error retrieving index for namespace %q", ctr.config.Namespace) } if err := nsIndex.idIndex.Delete(ctr.ID()); err != nil { return errors.Wrapf(err, "error removing container %s from namespace ID index", ctr.ID()) } nsIndex.nameIndex.Release(ctr.Name()) } // Remove us from container dependencies depCtrs := ctr.Dependencies() for _, depCtr := range depCtrs { s.removeCtrFromDependsMap(ctr.ID(), depCtr) } // Remove container from volume dependencies for _, vol := range ctr.config.Spec.Mounts { if strings.Contains(vol.Source, ctr.runtime.config.VolumePath) { volName := strings.Split(vol.Source[len(ctr.runtime.config.VolumePath)+1:], "/")[0] s.removeCtrFromVolDependsMap(ctr.ID(), volName) } } return nil } // UpdateContainer updates a container's state // As all state is in-memory, no update will be required // As such this is a no-op func (s *InMemoryState) UpdateContainer(ctr *Container) error { // If the container is invalid, return error if !ctr.valid { return errors.Wrapf(ErrCtrRemoved, "container with ID %s is not valid", ctr.ID()) } // If the container does not exist, return error if _, ok := s.containers[ctr.ID()]; !ok { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container with ID %s not found in state", ctr.ID()) } return s.checkNSMatch(ctr.ID(), ctr.Namespace()) } // SaveContainer saves a container's state // As all state is in-memory, any changes are always reflected as soon as they // are made // As such this is a no-op func (s *InMemoryState) SaveContainer(ctr *Container) error { // If the container is invalid, return error if !ctr.valid { return errors.Wrapf(ErrCtrRemoved, "container with ID %s is not valid", ctr.ID()) } // If the container does not exist, return error if _, ok := s.containers[ctr.ID()]; !ok { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container with ID %s not found in state", ctr.ID()) } return s.checkNSMatch(ctr.ID(), ctr.Namespace()) } // ContainerInUse checks if the given container is being used by other containers func (s *InMemoryState) ContainerInUse(ctr *Container) ([]string, error) { if !ctr.valid { return nil, ErrCtrRemoved } // If the container does not exist, return error if _, ok := s.containers[ctr.ID()]; !ok { ctr.valid = false return nil, errors.Wrapf(ErrNoSuchCtr, "container with ID %s not found in state", ctr.ID()) } if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return nil, err } arr, ok := s.ctrDepends[ctr.ID()] if !ok { return []string{}, nil } return arr, nil } // AllContainers retrieves all containers from the state func (s *InMemoryState) AllContainers() ([]*Container, error) { ctrs := make([]*Container, 0, len(s.containers)) for _, ctr := range s.containers { if s.namespace == "" || ctr.config.Namespace == s.namespace { ctrs = append(ctrs, ctr) } } return ctrs, nil } // RewriteContainerConfig rewrites a container's configuration. // This function is DANGEROUS, even with an in-memory state. // Please read the full comment on it in state.go before using it. func (s *InMemoryState) RewriteContainerConfig(ctr *Container, newCfg *ContainerConfig) error { if !ctr.valid { return ErrCtrRemoved } // If the container does not exist, return error stateCtr, ok := s.containers[ctr.ID()] if !ok { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container with ID %s not found in state", ctr.ID()) } stateCtr.config = newCfg return nil } // Volume retrieves a volume from its full name func (s *InMemoryState) Volume(name string) (*Volume, error) { if name == "" { return nil, ErrEmptyID } vol, ok := s.volumes[name] if !ok { return nil, errors.Wrapf(ErrNoSuchCtr, "no volume with name %s found", name) } return vol, nil } // HasVolume checks if a volume with the given name is present in the state func (s *InMemoryState) HasVolume(name string) (bool, error) { if name == "" { return false, ErrEmptyID } _, ok := s.volumes[name] if !ok { return false, nil } return true, nil } // AddVolume adds a volume to the state func (s *InMemoryState) AddVolume(volume *Volume) error { if !volume.valid { return errors.Wrapf(ErrVolumeRemoved, "volume with name %s is not valid", volume.Name()) } if _, ok := s.volumes[volume.Name()]; ok { return errors.Wrapf(ErrVolumeExists, "volume with name %s already exists in state", volume.Name()) } s.volumes[volume.Name()] = volume return nil } // RemoveVolume removes a volume from the state func (s *InMemoryState) RemoveVolume(volume *Volume) error { // Ensure we don't remove a volume which containers depend on deps, ok := s.volumeDepends[volume.Name()] if ok && len(deps) != 0 { depsStr := strings.Join(deps, ", ") return errors.Wrapf(ErrVolumeExists, "the following containers depend on volume %s: %s", volume.Name(), depsStr) } if _, ok := s.volumes[volume.Name()]; !ok { volume.valid = false return errors.Wrapf(ErrVolumeRemoved, "no volume exists in state with name %s", volume.Name()) } delete(s.volumes, volume.Name()) return nil } // RemoveVolCtrDep updates the container dependencies of the volume func (s *InMemoryState) RemoveVolCtrDep(volume *Volume, ctrID string) error { if !volume.valid { return errors.Wrapf(ErrVolumeRemoved, "volume with name %s is not valid", volume.Name()) } if _, ok := s.volumes[volume.Name()]; !ok { return errors.Wrapf(ErrNoSuchVolume, "volume with name %s doesn't exists in state", volume.Name()) } // Remove container that is using this volume s.removeCtrFromVolDependsMap(ctrID, volume.Name()) return nil } // VolumeInUse checks if the given volume is being used by at least one container func (s *InMemoryState) VolumeInUse(volume *Volume) ([]string, error) { if !volume.valid { return nil, ErrVolumeRemoved } // If the volume does not exist, return error if _, ok := s.volumes[volume.Name()]; !ok { volume.valid = false return nil, errors.Wrapf(ErrNoSuchVolume, "volume with name %s not found in state", volume.Name()) } arr, ok := s.volumeDepends[volume.Name()] if !ok { return []string{}, nil } return arr, nil } // AllVolumes returns all volumes that exist in the state func (s *InMemoryState) AllVolumes() ([]*Volume, error) { allVols := make([]*Volume, 0, len(s.volumes)) for _, v := range s.volumes { allVols = append(allVols, v) } return allVols, nil } // Pod retrieves a pod from the state from its full ID func (s *InMemoryState) Pod(id string) (*Pod, error) { if id == "" { return nil, ErrEmptyID } pod, ok := s.pods[id] if !ok { return nil, errors.Wrapf(ErrNoSuchPod, "no pod with id %s found", id) } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return nil, err } return pod, nil } // LookupPod retrieves a pod from the state from a full or unique partial ID or // a full name func (s *InMemoryState) LookupPod(idOrName string) (*Pod, error) { var ( nameIndex *registrar.Registrar idIndex *truncindex.TruncIndex ) if idOrName == "" { return nil, ErrEmptyID } if s.namespace != "" { nsIndex, ok := s.namespaceIndexes[s.namespace] if !ok { // We have no containers in the namespace // Return false return nil, errors.Wrapf(ErrNoSuchCtr, "no container found with name or ID %s", idOrName) } nameIndex = nsIndex.nameIndex idIndex = nsIndex.idIndex } else { nameIndex = s.nameIndex idIndex = s.idIndex } fullID, err := nameIndex.Get(idOrName) if err != nil { if err == registrar.ErrNameNotReserved { // What was passed is not a name, assume it's an ID fullID, err = idIndex.Get(idOrName) if err != nil { if err == truncindex.ErrNotExist { return nil, errors.Wrapf(ErrNoSuchPod, "no pod found with name or ID %s", idOrName) } return nil, errors.Wrapf(err, "error performing truncindex lookup for ID %s", idOrName) } } else { return nil, errors.Wrapf(err, "error performing registry lookup for ID %s", idOrName) } } pod, ok := s.pods[fullID] if !ok { // It's a container not a pod return nil, errors.Wrapf(ErrNoSuchPod, "id or name %s is a container not a pod", idOrName) } return pod, nil } // HasPod checks if a pod with the given ID is present in the state func (s *InMemoryState) HasPod(id string) (bool, error) { if id == "" { return false, ErrEmptyID } pod, ok := s.pods[id] if !ok || (s.namespace != "" && s.namespace != pod.config.Namespace) { return false, nil } return true, nil } // PodHasContainer checks if the given pod has a container with the given ID func (s *InMemoryState) PodHasContainer(pod *Pod, ctrID string) (bool, error) { if !pod.valid { return false, errors.Wrapf(ErrPodRemoved, "pod %s is not valid", pod.ID()) } if ctrID == "" { return false, ErrEmptyID } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return false, err } podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return false, errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in state", pod.ID()) } _, ok = podCtrs[ctrID] return ok, nil } // PodContainersByID returns the IDs of all containers in the given pod func (s *InMemoryState) PodContainersByID(pod *Pod) ([]string, error) { if !pod.valid { return nil, errors.Wrapf(ErrPodRemoved, "pod %s is not valid", pod.ID()) } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return nil, err } podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return nil, errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in state", pod.ID()) } length := len(podCtrs) if length == 0 { return []string{}, nil } ctrs := make([]string, 0, length) for _, ctr := range podCtrs { ctrs = append(ctrs, ctr.ID()) } return ctrs, nil } // PodContainers retrieves the containers from a pod func (s *InMemoryState) PodContainers(pod *Pod) ([]*Container, error) { if !pod.valid { return nil, errors.Wrapf(ErrPodRemoved, "pod %s is not valid", pod.ID()) } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return nil, err } podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return nil, errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in state", pod.ID()) } length := len(podCtrs) if length == 0 { return []*Container{}, nil } ctrs := make([]*Container, 0, length) for _, ctr := range podCtrs { ctrs = append(ctrs, ctr) } return ctrs, nil } // AddPod adds a given pod to the state func (s *InMemoryState) AddPod(pod *Pod) error { if !pod.valid { return errors.Wrapf(ErrPodRemoved, "pod %s is not valid and cannot be added", pod.ID()) } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return err } if _, ok := s.pods[pod.ID()]; ok { return errors.Wrapf(ErrPodExists, "pod with ID %s already exists in state", pod.ID()) } if _, ok := s.podContainers[pod.ID()]; ok { return errors.Wrapf(ErrPodExists, "pod with ID %s already exists in state", pod.ID()) } if err := s.nameIndex.Reserve(pod.Name(), pod.ID()); err != nil { return errors.Wrapf(err, "error registering pod name %s", pod.Name()) } if err := s.idIndex.Add(pod.ID()); err != nil { s.nameIndex.Release(pod.Name()) return errors.Wrapf(err, "error registering pod ID %s", pod.ID()) } s.pods[pod.ID()] = pod s.podContainers[pod.ID()] = make(map[string]*Container) // If we're in a namespace, add us to that namespace's indexes if pod.config.Namespace != "" { var nsIndex *namespaceIndex nsIndex, ok := s.namespaceIndexes[pod.config.Namespace] if !ok { nsIndex = new(namespaceIndex) nsIndex.nameIndex = registrar.NewRegistrar() nsIndex.idIndex = truncindex.NewTruncIndex([]string{}) s.namespaceIndexes[pod.config.Namespace] = nsIndex } // Should be no errors here, the previous index adds should have caught that if err := nsIndex.nameIndex.Reserve(pod.Name(), pod.ID()); err != nil { return errors.Wrapf(err, "error registering container name %s", pod.Name()) } if err := nsIndex.idIndex.Add(pod.ID()); err != nil { return errors.Wrapf(err, "error registering container ID %s", pod.ID()) } } return nil } // RemovePod removes a given pod from the state // Only empty pods can be removed func (s *InMemoryState) RemovePod(pod *Pod) error { // Don't make many validity checks to ensure we can kick badly formed // pods out of the state if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return err } if _, ok := s.pods[pod.ID()]; !ok { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID()) } podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID()) } if len(podCtrs) != 0 { return errors.Wrapf(ErrCtrExists, "pod %s is not empty and cannot be removed", pod.ID()) } if err := s.idIndex.Delete(pod.ID()); err != nil { return errors.Wrapf(err, "error removing pod ID %s from index", pod.ID()) } delete(s.pods, pod.ID()) delete(s.podContainers, pod.ID()) s.nameIndex.Release(pod.Name()) if pod.config.Namespace != "" { nsIndex, ok := s.namespaceIndexes[pod.config.Namespace] if !ok { return errors.Wrapf(ErrInternal, "error retrieving index for namespace %q", pod.config.Namespace) } if err := nsIndex.idIndex.Delete(pod.ID()); err != nil { return errors.Wrapf(err, "error removing container %s from namespace ID index", pod.ID()) } nsIndex.nameIndex.Release(pod.Name()) } return nil } // RemovePodContainers removes all containers from a pod // This is used to simultaneously remove a number of containers with // many interdependencies // Will only remove containers if no dependencies outside of the pod are present func (s *InMemoryState) RemovePodContainers(pod *Pod) error { if !pod.valid { return errors.Wrapf(ErrPodRemoved, "pod %s is not valid", pod.ID()) } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return err } // Get pod containers podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID()) } // Go through container dependencies. Check to see if any are outside the pod. for ctr := range podCtrs { ctrDeps, ok := s.ctrDepends[ctr] if ok { for _, dep := range ctrDeps { if _, ok := podCtrs[dep]; !ok { return errors.Wrapf(ErrCtrExists, "container %s has dependency %s outside of pod %s", ctr, dep, pod.ID()) } } } } // All dependencies are OK to remove // Remove all containers s.podContainers[pod.ID()] = make(map[string]*Container) for _, ctr := range podCtrs { if err := s.idIndex.Delete(ctr.ID()); err != nil { return errors.Wrapf(err, "error removing container ID from index") } s.nameIndex.Release(ctr.Name()) delete(s.containers, ctr.ID()) delete(s.ctrDepends, ctr.ID()) } return nil } // AddContainerToPod adds a container to the given pod, also adding it to the // state func (s *InMemoryState) AddContainerToPod(pod *Pod, ctr *Container) error { if !pod.valid { return errors.Wrapf(ErrPodRemoved, "pod %s is not valid", pod.ID()) } if !ctr.valid { return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", ctr.ID()) } if ctr.config.Pod != pod.ID() { return errors.Wrapf(ErrInvalidArg, "container %s is not in pod %s", ctr.ID(), pod.ID()) } if ctr.config.Namespace != pod.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %s and pod %s is in namespace %s", ctr.ID(), ctr.config.Namespace, pod.ID(), pod.config.Namespace) } if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return err } // Retrieve pod containers list podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return errors.Wrapf(ErrPodRemoved, "pod %s not found in state", pod.ID()) } // Is the container already in the pod? if _, ok = podCtrs[ctr.ID()]; ok { return errors.Wrapf(ErrCtrExists, "container with ID %s already exists in pod %s", ctr.ID(), pod.ID()) } // There are potential race conditions with this // But in-memory state is intended purely for testing and not production // use, so this should be fine. depCtrs := ctr.Dependencies() for _, depCtr := range depCtrs { if _, ok = s.containers[depCtr]; !ok { return errors.Wrapf(ErrNoSuchCtr, "cannot depend on nonexistent container %s", depCtr) } depCtrStruct, ok := podCtrs[depCtr] if !ok { return errors.Wrapf(ErrInvalidArg, "cannot depend on container %s as it is not in pod %s", depCtr, pod.ID()) } if depCtrStruct.config.Namespace != ctr.config.Namespace { return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %s and cannot depend on container %s in namespace %s", ctr.ID(), ctr.config.Namespace, depCtr, depCtrStruct.config.Namespace) } } // Add container to state if _, ok = s.containers[ctr.ID()]; ok { return errors.Wrapf(ErrCtrExists, "container with ID %s already exists in state", ctr.ID()) } if err := s.nameIndex.Reserve(ctr.Name(), ctr.ID()); err != nil { return errors.Wrapf(err, "error reserving container name %s", ctr.Name()) } if err := s.idIndex.Add(ctr.ID()); err != nil { s.nameIndex.Release(ctr.Name()) return errors.Wrapf(err, "error releasing container ID %s", ctr.ID()) } s.containers[ctr.ID()] = ctr // Add container to pod containers podCtrs[ctr.ID()] = ctr // If we're in a namespace, add us to that namespace's indexes if ctr.config.Namespace != "" { var nsIndex *namespaceIndex nsIndex, ok := s.namespaceIndexes[ctr.config.Namespace] if !ok { nsIndex = new(namespaceIndex) nsIndex.nameIndex = registrar.NewRegistrar() nsIndex.idIndex = truncindex.NewTruncIndex([]string{}) s.namespaceIndexes[ctr.config.Namespace] = nsIndex } // Should be no errors here, the previous index adds should have caught that if err := nsIndex.nameIndex.Reserve(ctr.Name(), ctr.ID()); err != nil { return errors.Wrapf(err, "error registering container name %s", ctr.Name()) } if err := nsIndex.idIndex.Add(ctr.ID()); err != nil { return errors.Wrapf(err, "error registering container ID %s", ctr.ID()) } } // Add containers this container depends on for _, depCtr := range depCtrs { s.addCtrToDependsMap(ctr.ID(), depCtr) } return nil } // RemoveContainerFromPod removes the given container from the given pod // The container is also removed from the state func (s *InMemoryState) RemoveContainerFromPod(pod *Pod, ctr *Container) error { if !pod.valid { return errors.Wrapf(ErrPodRemoved, "pod %s is not valid and containers cannot be removed", pod.ID()) } if !ctr.valid { return errors.Wrapf(ErrCtrRemoved, "container %s is not valid and cannot be removed from the pod", ctr.ID()) } if err := s.checkNSMatch(ctr.ID(), ctr.Namespace()); err != nil { return err } // Ensure we don't remove a container which other containers depend on deps, ok := s.ctrDepends[ctr.ID()] if ok && len(deps) != 0 { depsStr := strings.Join(deps, ", ") return errors.Wrapf(ErrCtrExists, "the following containers depend on container %s: %s", ctr.ID(), depsStr) } // Retrieve pod containers podCtrs, ok := s.podContainers[pod.ID()] if !ok { pod.valid = false return errors.Wrapf(ErrPodRemoved, "pod %s has been removed", pod.ID()) } // Does the container exist? if _, ok := s.containers[ctr.ID()]; !ok { ctr.valid = false return errors.Wrapf(ErrNoSuchCtr, "container %s does not exist in state", ctr.ID()) } // Is the container in the pod? if _, ok := podCtrs[ctr.ID()]; !ok { return errors.Wrapf(ErrNoSuchCtr, "container with ID %s not found in pod %s", ctr.ID(), pod.ID()) } // Remove container from state if _, ok := s.containers[ctr.ID()]; !ok { return errors.Wrapf(ErrNoSuchCtr, "no container exists in state with ID %s", ctr.ID()) } if err := s.idIndex.Delete(ctr.ID()); err != nil { return errors.Wrapf(err, "error removing container ID from index") } delete(s.containers, ctr.ID()) s.nameIndex.Release(ctr.Name()) // Remove the container from the pod delete(podCtrs, ctr.ID()) if ctr.config.Namespace != "" { nsIndex, ok := s.namespaceIndexes[ctr.config.Namespace] if !ok { return errors.Wrapf(ErrInternal, "error retrieving index for namespace %q", ctr.config.Namespace) } if err := nsIndex.idIndex.Delete(ctr.ID()); err != nil { return errors.Wrapf(err, "error removing container %s from namespace ID index", ctr.ID()) } nsIndex.nameIndex.Release(ctr.Name()) } // Remove us from container dependencies depCtrs := ctr.Dependencies() for _, depCtr := range depCtrs { s.removeCtrFromDependsMap(ctr.ID(), depCtr) } return nil } // UpdatePod updates a pod in the state // This is a no-op as there is no backing store func (s *InMemoryState) UpdatePod(pod *Pod) error { if !pod.valid { return ErrPodRemoved } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return err } if _, ok := s.pods[pod.ID()]; !ok { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID()) } return nil } // SavePod updates a pod in the state // This is a no-op at there is no backing store func (s *InMemoryState) SavePod(pod *Pod) error { if !pod.valid { return ErrPodRemoved } if err := s.checkNSMatch(pod.ID(), pod.Namespace()); err != nil { return err } if _, ok := s.pods[pod.ID()]; !ok { pod.valid = false return errors.Wrapf(ErrNoSuchPod, "no pod exists in state with ID %s", pod.ID()) } return nil } // AllPods retrieves all pods currently in the state func (s *InMemoryState) AllPods() ([]*Pod, error) { pods := make([]*Pod, 0, len(s.pods)) for _, pod := range s.pods { if s.namespace != "" { if s.namespace == pod.config.Namespace { pods = append(pods, pod) } } else { pods = append(pods, pod) } } return pods, nil } // Internal Functions // Add a container to the dependency mappings func (s *InMemoryState) addCtrToDependsMap(ctrID, dependsID string) { if dependsID != "" { arr, ok := s.ctrDepends[dependsID] if !ok { // Do not have a mapping for that container yet s.ctrDepends[dependsID] = []string{ctrID} } else { // Have a mapping for the container arr = append(arr, ctrID) s.ctrDepends[dependsID] = arr } } } // Remove a container from dependency mappings func (s *InMemoryState) removeCtrFromDependsMap(ctrID, dependsID string) { if dependsID != "" { arr, ok := s.ctrDepends[dependsID] if !ok { // Internal state seems inconsistent // But the dependency is definitely gone // So just return return } newArr := make([]string, 0, len(arr)) for _, id := range arr { if id != ctrID { newArr = append(newArr, id) } } s.ctrDepends[dependsID] = newArr } } // Add a container to the dependency mappings for the volume func (s *InMemoryState) addCtrToVolDependsMap(depCtrID, volName string) { if volName != "" { arr, ok := s.volumeDepends[volName] if !ok { // Do not have a mapping for that volume yet s.volumeDepends[volName] = []string{depCtrID} } else { // Have a mapping for the volume arr = append(arr, depCtrID) s.volumeDepends[volName] = arr } } } // Remove a container from the dependency mappings for the volume func (s *InMemoryState) removeCtrFromVolDependsMap(depCtrID, volName string) { if volName != "" { arr, ok := s.volumeDepends[volName] if !ok { // Internal state seems inconsistent // But the dependency is definitely gone // So just return return } newArr := make([]string, 0, len(arr)) for _, id := range arr { if id != depCtrID { newArr = append(newArr, id) } } s.volumeDepends[volName] = newArr } } // Check if we can access a pod or container, or if that is blocked by // namespaces. func (s *InMemoryState) checkNSMatch(id, ns string) error { if s.namespace != "" && s.namespace != ns { return errors.Wrapf(ErrNSMismatch, "cannot access %s as it is in namespace %q and we are in namespace %q", id, ns, s.namespace) } return nil }