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moby--moby/daemon/events.go

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package daemon
import (
"strings"
"time"
"github.com/docker/docker/container"
daemonevents "github.com/docker/docker/daemon/events"
"github.com/docker/engine-api/types/events"
"github.com/docker/engine-api/types/filters"
"github.com/docker/libnetwork"
)
// LogContainerEvent generates an event related to a container with only the default attributes.
func (daemon *Daemon) LogContainerEvent(container *container.Container, action string) {
daemon.LogContainerEventWithAttributes(container, action, map[string]string{})
}
// LogContainerEventWithAttributes generates an event related to a container with specific given attributes.
func (daemon *Daemon) LogContainerEventWithAttributes(container *container.Container, action string, attributes map[string]string) {
copyAttributes(attributes, container.Config.Labels)
if container.Config.Image != "" {
attributes["image"] = container.Config.Image
}
attributes["name"] = strings.TrimLeft(container.Name, "/")
actor := events.Actor{
ID: container.ID,
Attributes: attributes,
}
daemon.EventsService.Log(action, events.ContainerEventType, actor)
}
// LogImageEvent generates an event related to an image with only the default attributes.
func (daemon *Daemon) LogImageEvent(imageID, refName, action string) {
daemon.LogImageEventWithAttributes(imageID, refName, action, map[string]string{})
}
// LogImageEventWithAttributes generates an event related to an image with specific given attributes.
func (daemon *Daemon) LogImageEventWithAttributes(imageID, refName, action string, attributes map[string]string) {
img, err := daemon.GetImage(imageID)
if err == nil && img.Config != nil {
// image has not been removed yet.
// it could be missing if the event is `delete`.
copyAttributes(attributes, img.Config.Labels)
}
if refName != "" {
attributes["name"] = refName
}
actor := events.Actor{
ID: imageID,
Attributes: attributes,
}
daemon.EventsService.Log(action, events.ImageEventType, actor)
}
// LogVolumeEvent generates an event related to a volume.
func (daemon *Daemon) LogVolumeEvent(volumeID, action string, attributes map[string]string) {
actor := events.Actor{
ID: volumeID,
Attributes: attributes,
}
daemon.EventsService.Log(action, events.VolumeEventType, actor)
}
// LogNetworkEvent generates an event related to a network with only the default attributes.
func (daemon *Daemon) LogNetworkEvent(nw libnetwork.Network, action string) {
daemon.LogNetworkEventWithAttributes(nw, action, map[string]string{})
}
// LogNetworkEventWithAttributes generates an event related to a network with specific given attributes.
func (daemon *Daemon) LogNetworkEventWithAttributes(nw libnetwork.Network, action string, attributes map[string]string) {
attributes["name"] = nw.Name()
attributes["type"] = nw.Type()
actor := events.Actor{
ID: nw.ID(),
Attributes: attributes,
}
daemon.EventsService.Log(action, events.NetworkEventType, actor)
}
// LogDaemonEventWithAttributes generates an event related to the daemon itself with specific given attributes.
func (daemon *Daemon) LogDaemonEventWithAttributes(action string, attributes map[string]string) {
if daemon.EventsService != nil {
if info, err := daemon.SystemInfo(); err == nil && info.Name != "" {
attributes["name"] = info.Name
}
actor := events.Actor{
ID: daemon.ID,
Attributes: attributes,
}
daemon.EventsService.Log(action, events.DaemonEventType, actor)
}
}
// SubscribeToEvents returns the currently record of events, a channel to stream new events from, and a function to cancel the stream of events.
func (daemon *Daemon) SubscribeToEvents(since, until time.Time, filter filters.Args) ([]events.Message, chan interface{}) {
ef := daemonevents.NewFilter(filter)
return daemon.EventsService.SubscribeTopic(since, until, ef)
}
// UnsubscribeFromEvents stops the event subscription for a client by closing the
// channel where the daemon sends events to.
func (daemon *Daemon) UnsubscribeFromEvents(listener chan interface{}) {
daemon.EventsService.Evict(listener)
}
// copyAttributes guarantees that labels are not mutated by event triggers.
func copyAttributes(attributes, labels map[string]string) {
if labels == nil {
return
}
for k, v := range labels {
attributes[k] = v
}
}