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moby--moby/daemon/list.go

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package daemon
import (
"errors"
"fmt"
"strconv"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
derr "github.com/docker/docker/errors"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/graphdb"
"github.com/docker/docker/pkg/nat"
"github.com/docker/docker/pkg/parsers/filters"
)
// iterationAction represents possible outcomes happening during the container iteration.
type iterationAction int
// containerReducer represents a reducer for a container.
// Returns the object to serialize by the api.
type containerReducer func(*Container, *listContext) (*types.Container, error)
const (
// includeContainer is the action to include a container in the reducer.
includeContainer iterationAction = iota
// excludeContainer is the action to exclude a container in the reducer.
excludeContainer
// stopIteration is the action to stop iterating over the list of containers.
stopIteration
)
// errStopIteration makes the iterator to stop without returning an error.
var errStopIteration = errors.New("container list iteration stopped")
// List returns an array of all containers registered in the daemon.
func (daemon *Daemon) List() []*Container {
return daemon.containers.List()
}
// ContainersConfig is the filtering specified by the user to iterate over containers.
type ContainersConfig struct {
// if true show all containers, otherwise only running containers.
All bool
// show all containers created after this container id
Since string
// show all containers created before this container id
Before string
// number of containers to return at most
Limit int
// if true include the sizes of the containers
Size bool
// return only containers that match filters
Filters string
}
// listContext is the daemon generated filtering to iterate over containers.
// This is created based on the user specification.
type listContext struct {
// idx is the container iteration index for this context
idx int
// ancestorFilter tells whether it should check ancestors or not
ancestorFilter bool
// names is a list of container names to filter with
names map[string][]string
// images is a list of images to filter with
images map[image.ID]bool
// filters is a collection of arguments to filter with, specified by the user
filters filters.Args
// exitAllowed is a list of exit codes allowed to filter with
exitAllowed []int
// beforeFilter is a filter to ignore containers that appear before the one given
// this is used for --filter=before= and --before=, the latter is deprecated.
beforeFilter *Container
// sinceFilter is a filter to stop the filtering when the iterator arrive to the given container
// this is used for --filter=since= and --since=, the latter is deprecated.
sinceFilter *Container
// ContainersConfig is the filters set by the user
*ContainersConfig
}
// Containers returns the list of containers to show given the user's filtering.
func (daemon *Daemon) Containers(config *ContainersConfig) ([]*types.Container, error) {
return daemon.reduceContainers(config, daemon.transformContainer)
}
// reduceContainer parses the user filtering and generates the list of containers to return based on a reducer.
func (daemon *Daemon) reduceContainers(config *ContainersConfig, reducer containerReducer) ([]*types.Container, error) {
containers := []*types.Container{}
ctx, err := daemon.foldFilter(config)
if err != nil {
return nil, err
}
for _, container := range daemon.List() {
t, err := daemon.reducePsContainer(container, ctx, reducer)
if err != nil {
if err != errStopIteration {
return nil, err
}
break
}
if t != nil {
containers = append(containers, t)
ctx.idx++
}
}
return containers, nil
}
// reducePsContainer is the basic representation for a container as expected by the ps command.
func (daemon *Daemon) reducePsContainer(container *Container, ctx *listContext, reducer containerReducer) (*types.Container, error) {
container.Lock()
defer container.Unlock()
// filter containers to return
action := includeContainerInList(container, ctx)
switch action {
case excludeContainer:
return nil, nil
case stopIteration:
return nil, errStopIteration
}
// transform internal container struct into api structs
return reducer(container, ctx)
}
// foldFilter generates the container filter based in the user's filtering options.
func (daemon *Daemon) foldFilter(config *ContainersConfig) (*listContext, error) {
psFilters, err := filters.FromParam(config.Filters)
if err != nil {
return nil, err
}
var filtExited []int
if i, ok := psFilters["exited"]; ok {
for _, value := range i {
code, err := strconv.Atoi(value)
if err != nil {
return nil, err
}
filtExited = append(filtExited, code)
}
}
if i, ok := psFilters["status"]; ok {
for _, value := range i {
if !isValidStateString(value) {
return nil, errors.New("Unrecognised filter value for status")
}
config.All = true
}
}
var beforeContFilter, sinceContFilter *Container
if i, ok := psFilters["before"]; ok {
for _, value := range i {
beforeContFilter, err = daemon.Get(value)
if err != nil {
return nil, err
}
}
}
if i, ok := psFilters["since"]; ok {
for _, value := range i {
sinceContFilter, err = daemon.Get(value)
if err != nil {
return nil, err
}
}
}
imagesFilter := map[image.ID]bool{}
var ancestorFilter bool
if ancestors, ok := psFilters["ancestor"]; ok {
ancestorFilter = true
// The idea is to walk the graph down the most "efficient" way.
for _, ancestor := range ancestors {
// First, get the imageId of the ancestor filter (yay)
id, err := daemon.GetImageID(ancestor)
if err != nil {
logrus.Warnf("Error while looking up for image %v", ancestor)
continue
}
if imagesFilter[id] {
// Already seen this ancestor, skip it
continue
}
// Then walk down the graph and put the imageIds in imagesFilter
populateImageFilterByParents(imagesFilter, id, daemon.imageStore.Children)
}
}
names := make(map[string][]string)
daemon.containerGraph().Walk("/", func(p string, e *graphdb.Entity) error {
names[e.ID()] = append(names[e.ID()], p)
return nil
}, 1)
if config.Before != "" {
beforeContFilter, err = daemon.Get(config.Before)
if err != nil {
return nil, err
}
}
if config.Since != "" {
sinceContFilter, err = daemon.Get(config.Since)
if err != nil {
return nil, err
}
}
return &listContext{
filters: psFilters,
ancestorFilter: ancestorFilter,
names: names,
images: imagesFilter,
exitAllowed: filtExited,
beforeFilter: beforeContFilter,
sinceFilter: sinceContFilter,
ContainersConfig: config,
}, nil
}
// includeContainerInList decides whether a containers should be include in the output or not based in the filter.
// It also decides if the iteration should be stopped or not.
func includeContainerInList(container *Container, ctx *listContext) iterationAction {
// Do not include container if it's stopped and we're not filters
if !container.Running && !ctx.All && ctx.Limit <= 0 && ctx.beforeFilter == nil && ctx.sinceFilter == nil {
return excludeContainer
}
// Do not include container if the name doesn't match
if !ctx.filters.Match("name", container.Name) {
return excludeContainer
}
// Do not include container if the id doesn't match
if !ctx.filters.Match("id", container.ID) {
return excludeContainer
}
// Do not include container if any of the labels don't match
if !ctx.filters.MatchKVList("label", container.Config.Labels) {
return excludeContainer
}
// Do not include container if the isolation mode doesn't match
if excludeContainer == excludeByIsolation(container, ctx) {
return excludeContainer
}
// Do not include container if it's in the list before the filter container.
// Set the filter container to nil to include the rest of containers after this one.
if ctx.beforeFilter != nil {
if container.ID == ctx.beforeFilter.ID {
ctx.beforeFilter = nil
}
return excludeContainer
}
// Stop interation when the container arrives to the filter container
if ctx.sinceFilter != nil {
if container.ID == ctx.sinceFilter.ID {
return stopIteration
}
}
// Stop iteration when the index is over the limit
if ctx.Limit > 0 && ctx.idx == ctx.Limit {
return stopIteration
}
// Do not include container if its exit code is not in the filter
if len(ctx.exitAllowed) > 0 {
shouldSkip := true
for _, code := range ctx.exitAllowed {
if code == container.ExitCode && !container.Running {
shouldSkip = false
break
}
}
if shouldSkip {
return excludeContainer
}
}
// Do not include container if its status doesn't match the filter
if !ctx.filters.Match("status", container.State.StateString()) {
return excludeContainer
}
if ctx.ancestorFilter {
if len(ctx.images) == 0 {
return excludeContainer
}
if !ctx.images[container.ImageID] {
return excludeContainer
}
}
return includeContainer
}
// transformContainer generates the container type expected by the docker ps command.
func (daemon *Daemon) transformContainer(container *Container, ctx *listContext) (*types.Container, error) {
newC := &types.Container{
ID: container.ID,
Names: ctx.names[container.ID],
ImageID: container.ImageID.String(),
}
if newC.Names == nil {
// Dead containers will often have no name, so make sure the response isn't null
newC.Names = []string{}
}
image := container.Config.Image // if possible keep the original ref
if image != container.ImageID.String() {
id, err := daemon.GetImageID(image)
if _, isDNE := err.(ErrImageDoesNotExist); err != nil && !isDNE {
return nil, err
}
if err != nil || id != container.ImageID {
image = container.ImageID.String()
}
}
newC.Image = image
if len(container.Args) > 0 {
args := []string{}
for _, arg := range container.Args {
if strings.Contains(arg, " ") {
args = append(args, fmt.Sprintf("'%s'", arg))
} else {
args = append(args, arg)
}
}
argsAsString := strings.Join(args, " ")
newC.Command = fmt.Sprintf("%s %s", container.Path, argsAsString)
} else {
newC.Command = container.Path
}
newC.Created = container.Created.Unix()
newC.Status = container.State.String()
newC.HostConfig.NetworkMode = string(container.hostConfig.NetworkMode)
newC.Ports = []types.Port{}
for port, bindings := range container.NetworkSettings.Ports {
p, err := nat.ParsePort(port.Port())
if err != nil {
return nil, err
}
if len(bindings) == 0 {
newC.Ports = append(newC.Ports, types.Port{
PrivatePort: p,
Type: port.Proto(),
})
continue
}
for _, binding := range bindings {
h, err := nat.ParsePort(binding.HostPort)
if err != nil {
return nil, err
}
newC.Ports = append(newC.Ports, types.Port{
PrivatePort: p,
PublicPort: h,
Type: port.Proto(),
IP: binding.HostIP,
})
}
}
if ctx.Size {
sizeRw, sizeRootFs := daemon.getSize(container)
newC.SizeRw = sizeRw
newC.SizeRootFs = sizeRootFs
}
newC.Labels = container.Config.Labels
return newC, nil
}
// Volumes lists known volumes, using the filter to restrict the range
// of volumes returned.
func (daemon *Daemon) Volumes(filter string) ([]*types.Volume, error) {
var volumesOut []*types.Volume
volFilters, err := filters.FromParam(filter)
if err != nil {
return nil, err
}
filterUsed := false
if i, ok := volFilters["dangling"]; ok {
if len(i) > 1 {
return nil, derr.ErrorCodeDanglingOne
}
filterValue := i[0]
if strings.ToLower(filterValue) == "true" || filterValue == "1" {
filterUsed = true
}
}
volumes := daemon.volumes.List()
for _, v := range volumes {
if filterUsed && daemon.volumes.Count(v) > 0 {
continue
}
volumesOut = append(volumesOut, volumeToAPIType(v))
}
return volumesOut, nil
}
func populateImageFilterByParents(ancestorMap map[image.ID]bool, imageID image.ID, getChildren func(image.ID) []image.ID) {
if !ancestorMap[imageID] {
for _, id := range getChildren(imageID) {
populateImageFilterByParents(ancestorMap, id, getChildren)
}
ancestorMap[imageID] = true
}
}