forked from moby/moby
/
filter.go
64 lines (56 loc) · 1.85 KB
/
filter.go
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package events
import (
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/parsers/filters"
)
// Filter can filter out docker events from a stream
type Filter struct {
filter filters.Args
getLabels func(id string) map[string]string
}
// NewFilter creates a new Filter
func NewFilter(filter filters.Args, getLabels func(id string) map[string]string) *Filter {
return &Filter{filter: filter, getLabels: getLabels}
}
// Include returns true when the event ev is included by the filters
func (ef *Filter) Include(ev *jsonmessage.JSONMessage) bool {
return isFieldIncluded(ev.Status, ef.filter["event"]) &&
isFieldIncluded(ev.ID, ef.filter["container"]) &&
ef.isImageIncluded(ev.ID, ev.From) &&
ef.isLabelFieldIncluded(ev.ID)
}
func (ef *Filter) isLabelFieldIncluded(id string) bool {
if _, ok := ef.filter["label"]; !ok {
return true
}
return ef.filter.MatchKVList("label", ef.getLabels(id))
}
// The image filter will be matched against both event.ID (for image events)
// and event.From (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) isImageIncluded(eventID string, eventFrom string) bool {
stripTag := func(image string) string {
repo, _ := parsers.ParseRepositoryTag(image)
return repo
}
return isFieldIncluded(eventID, ef.filter["image"]) ||
isFieldIncluded(eventFrom, ef.filter["image"]) ||
isFieldIncluded(stripTag(eventID), ef.filter["image"]) ||
isFieldIncluded(stripTag(eventFrom), ef.filter["image"])
}
func isFieldIncluded(field string, filter []string) bool {
if len(field) == 0 {
return true
}
if len(filter) == 0 {
return true
}
for _, v := range filter {
if v == field {
return true
}
}
return false
}