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package events // import "github.com/docker/docker/daemon/events"
import (
"github.com/docker/distribution/reference"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/api/types/filters"
)
// Filter can filter out docker events from a stream
type Filter struct {
filter filters.Args
}
// NewFilter creates a new Filter
func NewFilter(filter filters.Args) *Filter {
return &Filter{filter: filter}
}
// Include returns true when the event ev is included by the filters
func (ef *Filter) Include(ev events.Message) bool {
return ef.matchEvent(ev) &&
ef.filter.ExactMatch("type", ev.Type) &&
ef.matchScope(ev.Scope) &&
ef.matchDaemon(ev) &&
ef.matchContainer(ev) &&
ef.matchPlugin(ev) &&
ef.matchVolume(ev) &&
ef.matchNetwork(ev) &&
ef.matchImage(ev) &&
ef.matchNode(ev) &&
ef.matchService(ev) &&
ef.matchSecret(ev) &&
ef.matchConfig(ev) &&
ef.matchLabels(ev.Actor.Attributes)
}
func (ef *Filter) matchEvent(ev events.Message) bool {
// #25798 if an event filter contains either health_status, exec_create or exec_start without a colon
// Let's to a FuzzyMatch instead of an ExactMatch.
if ef.filterContains("event", map[string]struct{}{"health_status": {}, "exec_create": {}, "exec_start": {}}) {
return ef.filter.FuzzyMatch("event", ev.Action)
}
return ef.filter.ExactMatch("event", ev.Action)
}
func (ef *Filter) filterContains(field string, values map[string]struct{}) bool {
for _, v := range ef.filter.Get(field) {
if _, ok := values[v]; ok {
return true
}
}
return false
}
func (ef *Filter) matchScope(scope string) bool {
if !ef.filter.Contains("scope") {
return true
}
return ef.filter.ExactMatch("scope", scope)
}
func (ef *Filter) matchLabels(attributes map[string]string) bool {
if !ef.filter.Contains("label") {
return true
}
return ef.filter.MatchKVList("label", attributes)
}
func (ef *Filter) matchDaemon(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.DaemonEventType)
}
func (ef *Filter) matchContainer(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.ContainerEventType)
}
func (ef *Filter) matchPlugin(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.PluginEventType)
}
func (ef *Filter) matchVolume(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.VolumeEventType)
}
func (ef *Filter) matchNetwork(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.NetworkEventType)
}
func (ef *Filter) matchService(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.ServiceEventType)
}
func (ef *Filter) matchNode(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.NodeEventType)
}
func (ef *Filter) matchSecret(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.SecretEventType)
}
func (ef *Filter) matchConfig(ev events.Message) bool {
return ef.fuzzyMatchName(ev, events.ConfigEventType)
}
func (ef *Filter) fuzzyMatchName(ev events.Message, eventType events.Type) bool {
return ef.filter.FuzzyMatch(eventType, ev.Actor.ID) ||
ef.filter.FuzzyMatch(eventType, ev.Actor.Attributes["name"])
}
// matchImage matches against both event.Actor.ID (for image events)
// and event.Actor.Attributes["image"] (for container events), so that any container that was created
// from an image will be included in the image events. Also compare both
// against the stripped repo name without any tags.
func (ef *Filter) matchImage(ev events.Message) bool {
id := ev.Actor.ID
nameAttr := "image"
var imageName string
if ev.Type == events.ImageEventType {
nameAttr = "name"
}
if n, ok := ev.Actor.Attributes[nameAttr]; ok {
imageName = n
}
return ef.filter.ExactMatch("image", id) ||
ef.filter.ExactMatch("image", imageName) ||
ef.filter.ExactMatch("image", stripTag(id)) ||
ef.filter.ExactMatch("image", stripTag(imageName))
}
func stripTag(image string) string {
ref, err := reference.ParseNormalizedNamed(image)
if err != nil {
return image
}
return reference.FamiliarName(ref)
}
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