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This fix tries to cover the issue raised in #22463 by adding filter for events emitted by docker daemon so that user could utilize filter to receive events of interest. Documentations have been updated for this fix. Additional tests have been added to cover the changes in this fix. This fix fixes #22463. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
package events
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import (
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"github.com/docker/docker/reference"
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"github.com/docker/engine-api/types/events"
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"github.com/docker/engine-api/types/filters"
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)
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// Filter can filter out docker events from a stream
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type Filter struct {
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filter filters.Args
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}
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// NewFilter creates a new Filter
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func NewFilter(filter filters.Args) *Filter {
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return &Filter{filter: filter}
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}
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// Include returns true when the event ev is included by the filters
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func (ef *Filter) Include(ev events.Message) bool {
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return ef.filter.ExactMatch("event", ev.Action) &&
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ef.filter.ExactMatch("type", ev.Type) &&
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ef.matchDaemon(ev) &&
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ef.matchContainer(ev) &&
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ef.matchVolume(ev) &&
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ef.matchNetwork(ev) &&
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ef.matchImage(ev) &&
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ef.matchLabels(ev.Actor.Attributes)
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}
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func (ef *Filter) matchLabels(attributes map[string]string) bool {
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if !ef.filter.Include("label") {
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return true
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}
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return ef.filter.MatchKVList("label", attributes)
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}
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func (ef *Filter) matchDaemon(ev events.Message) bool {
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return ef.fuzzyMatchName(ev, events.DaemonEventType)
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}
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func (ef *Filter) matchContainer(ev events.Message) bool {
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return ef.fuzzyMatchName(ev, events.ContainerEventType)
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}
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func (ef *Filter) matchVolume(ev events.Message) bool {
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return ef.fuzzyMatchName(ev, events.VolumeEventType)
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}
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func (ef *Filter) matchNetwork(ev events.Message) bool {
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return ef.fuzzyMatchName(ev, events.NetworkEventType)
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}
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func (ef *Filter) fuzzyMatchName(ev events.Message, eventType string) bool {
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return ef.filter.FuzzyMatch(eventType, ev.Actor.ID) ||
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ef.filter.FuzzyMatch(eventType, ev.Actor.Attributes["name"])
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}
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// matchImage matches against both event.Actor.ID (for image events)
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// and event.Actor.Attributes["image"] (for container events), so that any container that was created
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// from an image will be included in the image events. Also compare both
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// against the stripped repo name without any tags.
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func (ef *Filter) matchImage(ev events.Message) bool {
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id := ev.Actor.ID
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nameAttr := "image"
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var imageName string
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if ev.Type == events.ImageEventType {
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nameAttr = "name"
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}
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if n, ok := ev.Actor.Attributes[nameAttr]; ok {
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imageName = n
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}
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return ef.filter.ExactMatch("image", id) ||
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ef.filter.ExactMatch("image", imageName) ||
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ef.filter.ExactMatch("image", stripTag(id)) ||
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ef.filter.ExactMatch("image", stripTag(imageName))
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}
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func stripTag(image string) string {
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ref, err := reference.ParseNamed(image)
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if err != nil {
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return image
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}
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return ref.Name()
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}
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