github.com/walkingsparrow/docker@v1.4.2-0.20151218153551-b708a2249bfa/daemon/events/filter.go (about)

     1  package events
     2  
     3  import (
     4  	"github.com/docker/docker/api/types/filters"
     5  	"github.com/docker/docker/pkg/jsonmessage"
     6  	"github.com/docker/docker/reference"
     7  )
     8  
     9  // Filter can filter out docker events from a stream
    10  type Filter struct {
    11  	filter    filters.Args
    12  	getLabels func(id string) map[string]string
    13  }
    14  
    15  // NewFilter creates a new Filter
    16  func NewFilter(filter filters.Args, getLabels func(id string) map[string]string) *Filter {
    17  	return &Filter{filter: filter, getLabels: getLabels}
    18  }
    19  
    20  // Include returns true when the event ev is included by the filters
    21  func (ef *Filter) Include(ev *jsonmessage.JSONMessage) bool {
    22  	return ef.filter.ExactMatch("event", ev.Status) &&
    23  		ef.filter.ExactMatch("container", ev.ID) &&
    24  		ef.isImageIncluded(ev.ID, ev.From) &&
    25  		ef.isLabelFieldIncluded(ev.ID)
    26  }
    27  
    28  func (ef *Filter) isLabelFieldIncluded(id string) bool {
    29  	if !ef.filter.Include("label") {
    30  		return true
    31  	}
    32  	return ef.filter.MatchKVList("label", ef.getLabels(id))
    33  }
    34  
    35  // The image filter will be matched against both event.ID (for image events)
    36  // and event.From (for container events), so that any container that was created
    37  // from an image will be included in the image events. Also compare both
    38  // against the stripped repo name without any tags.
    39  func (ef *Filter) isImageIncluded(eventID string, eventFrom string) bool {
    40  	return ef.filter.ExactMatch("image", eventID) ||
    41  		ef.filter.ExactMatch("image", eventFrom) ||
    42  		ef.filter.ExactMatch("image", stripTag(eventID)) ||
    43  		ef.filter.ExactMatch("image", stripTag(eventFrom))
    44  }
    45  
    46  func stripTag(image string) string {
    47  	ref, err := reference.ParseNamed(image)
    48  	if err != nil {
    49  		return image
    50  	}
    51  	return ref.Name()
    52  }