func (w *Worker) DoWork(rawEvent []byte, eventHandlers map[string]EventHandler, apiClient *client.RancherClient,
workers chan *Worker) {
defer func() { workers <- w }()
event := &Event{}
err := json.Unmarshal(rawEvent, &event)
if err != nil {
log.WithFields(log.Fields{
"err": err,
}).Error("Error unmarshalling event")
return
}
if event.Name != "ping" {
log.WithFields(log.Fields{
"event": string(rawEvent[:]),
}).Debug("Processing event.")
}
unlocker := locks.Lock(event.ResourceId)
if unlocker == nil {
log.WithFields(log.Fields{
"resourceId": event.ResourceId,
}).Debug("Resource locked. Dropping event")
return
}
defer unlocker.Unlock()
if fn, ok := eventHandlers[event.Name]; ok {
err = fn(event, apiClient)
if err != nil {
log.WithFields(log.Fields{
"eventName": event.Name,
"eventId": event.Id,
"resourceId": event.ResourceId,
"err": err,
}).Error("Error processing event")
reply := &client.Publish{
Name: event.ReplyTo,
PreviousIds: []string{event.Id},
Transitioning: "error",
TransitioningMessage: err.Error(),
}
_, err := apiClient.Publish.Create(reply)
if err != nil {
log.WithFields(log.Fields{
"err": err,
}).Error("Error sending error-reply")
}
}
} else {
log.WithFields(log.Fields{
"eventName": event.Name,
}).Warn("No event handler registered for event")
}
}
func (h *StartHandler) Handle(event *docker.APIEvents) error {
// Note: event.ID == container's ID
lock := locks.Lock("start." + event.ID)
if lock == nil {
log.Infof("Container locked. Can't run StartHandler. ID: [%s]", event.ID)
return nil
}
defer lock.Unlock()
c, err := h.Client.InspectContainer(event.ID)
if err != nil {
return err
}
rancherIP, err := h.getRancherIP(c)
if err != nil {
return err
}
if rancherIP == "" {
if c.Config.Labels[RancherDns] == "true" {
return setupResolvConf(c)
}
return nil
}
if !c.State.Running {
log.Infof("Container [%s] not running. Can't assign IP [%s].", c.ID, rancherIP)
return nil
}
pid := c.State.Pid
log.Infof("Assigning IP [%s], ContainerId [%s], Pid [%v]", rancherIP, event.ID, pid)
if err := configureIP(strconv.Itoa(pid), rancherIP); err != nil {
// If it stopped running, don't return error
c, inspectErr := h.Client.InspectContainer(event.ID)
if inspectErr != nil {
log.Warn("Failed to inspect container: ", event.ID, inspectErr)
return err
}
if !c.State.Running {
log.Infof("Container [%s] not running. Can't assign IP [%s].", c.ID, rancherIP)
return nil
}
return err
}
return setupResolvConf(c)
}
func TestLocking(t *testing.T) {
dockerClient := prep(t)
eventId := "fake id"
lock := locks.Lock("start." + eventId)
handler := &StartHandler{Client: dockerClient}
event := &docker.APIEvents{ID: eventId}
if err := handler.Handle(event); err != nil {
// If the lock didn't work, this would fail because of the fake id.
t.Fatal(err)
}
lock.Unlock()
if err := handler.Handle(event); err == nil {
// Unlocked, should return error
t.Fatal(err)
}
}
func (h *SendToRancherHandler) Handle(event *docker.APIEvents) error {
// rancher_state_watcher sends a simulated event to the event router to initiate ip injection.
// This event should not be sent.
if event.From == simulatedEvent {
return nil
}
// Note: event.ID == container's ID
lock := locks.Lock(event.Status + event.ID)
if lock == nil {
log.Warnf("Container locked. Can't run SendToRancherHandler. Event: [%s], ID: [%s]", event.Status, event.ID)
return nil
}
defer lock.Unlock()
container, err := h.client.InspectContainer(event.ID)
if err != nil {
if _, ok := err.(*docker.NoSuchContainer); !ok {
return err
}
}
containerEvent := &rclient.ContainerEvent{
ExternalStatus: event.Status,
ExternalId: event.ID,
ExternalFrom: event.From,
ExternalTimestamp: int64(event.Time),
ReportedHostUuid: h.hostUuid,
}
if container != nil {
containerEvent.DockerInspect = container
}
if _, err := h.rancher.ContainerEvent.Create(containerEvent); err != nil {
return err
}
return nil
}
