func callEvent(event *docker.APIEvents) tree_lib.TreeError {
var err tree_lib.TreeError
err.From = tree_lib.FROM_CALL_EVENT
switch event.Status {
case "start", "unpouse":
{
var (
dock_inspect *docker.Container
)
dock_inspect, err.Err = DockerClient.InspectContainer(event.ID)
if !err.IsNull() {
return err
}
ci := ContainerInfo{InspectContainer: dock_inspect, ID: event.ID, Image: dock_inspect.Config.Image}
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_CONTAINER_START, LocalVar: &ci})
}
case "die", "kill", "pause":
{
// Sending only Container ID if it stopped
// Sometimes Docker API not giving all info about container after stopping it
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_CONTAINER_STOP, LocalVar: event.ID})
}
case "pull", "tag":
{
var (
inspect *docker.Image
)
inspect, err.Err = DockerClient.InspectImage(event.ID)
if !err.IsNull() {
return err
}
im := ImageInfo{ID: inspect.ID, Name: event.ID, Inspect: inspect}
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_IMAGE_CREATE, LocalVar: &im})
}
case "untag", "delete":
{
var (
inspect *docker.Image
)
inspect, err.Err = DockerClient.InspectImage(event.ID)
if !err.IsNull() {
return err
}
im := ImageInfo{ID: inspect.ID, Name: event.ID, Inspect: inspect}
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_IMAGE_DELETE, LocalVar: &im})
}
}
return err
}
func StartEventListener() (err tree_lib.TreeError) {
err.From = tree_lib.FROM_START_EVENT_LISTENER
err = InitDockerClient()
if !err.IsNull() {
return
}
err = triggerInitEvent()
if !err.IsNull() {
return
}
// When function will be returned local event for ending docker client will be triggered
defer tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_END, LocalVar: nil})
ev := make(chan *docker.APIEvents)
err.Err = DockerClient.AddEventListener(ev)
if !err.IsNull() {
return
}
for {
err = callEvent(<-ev)
if !err.IsNull() {
break
}
}
return
}
func (bs *BalancingService) CheckForStopEvent() (err tree_lib.TreeError) {
// If our balancer don't have any destination we need to stop it and call global callback about it
if len(bs.destinations) > 0 {
return
}
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_BALANCER_SERVICE_STOP, LocalVar: &bs.BalancerConfig})
// Deleting service from LVS
// err = bs.DropService() // We don't need to delete service from here
return
}
func triggerInitEvent() tree_lib.TreeError {
var (
err tree_lib.TreeError
dock_containers []docker.APIContainers
)
err.From = tree_lib.FROM_TRIGGER_INIT_EVENT
dock_containers, err.Err = DockerClient.ListContainers(docker.ListContainersOptions{All: false})
if !err.IsNull() {
return err
}
// Triggering event with currently running Docker containers inside
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_DOCKER_INIT, LocalVar: dock_containers})
return err
}
func UpdateNodeChange(info node_info.NodeInfo) {
var (
ev = &tree_event.Event{}
err tree_lib.TreeError
)
err.From = tree_lib.FROM_UPDATE_NODE_CHANGE
ev.Data, err.Err = ffjson.Marshal(info)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
path := &tree_graph.Path{From: node_info.CurrentNodeInfo.Name, Nodes: []string{"*"}}
ev.Name = tree_event.ON_UPDATE_NODE_INFO
tree_event.Trigger(ev)
tree_event.Emit(ev, path)
}
func NewBalancerFromConfig(bc BalancerConfig) (bs BalancingService, err error) {
var bs_addr Address
bs_addr = Address{IP: bc.IP, Port: bc.Port}
bs, err = NewBalancer(bs_addr, bc.Algorithm)
if err != nil {
return
}
for _, im := range bc.Images {
im = strings.Replace(im, " ", "", -1) // Deleting spaces
im_split := strings.Split(im, "|") // splitting image name and port
bs.DockerImages[im_split[0]], err = strconv.Atoi(im_split[1])
if err != nil {
return
}
}
bs.BalancerConfig = bc
bs.SubscribeEvents()
tree_event.Trigger(&tree_event.Event{Name: tree_event.ON_BALANCER_SERVICE_START, LocalVar: &bs.BalancerConfig})
return
}
func init() {
var err tree_lib.TreeError
err.From = tree_lib.FROM_INIT
tree_db, err.Err = bolt.Open(DB_DIR, 0600, nil)
if !err.IsNull() {
tree_log.Error(log_from_db, " unable to open database", err.Error())
tree_db = nil
os.Exit(1) // Without database we can't keep and share configurations, so program should be exited
}
// creating Buckets in database
tree_db.Update(func(tx *bolt.Tx) (err error) {
// Setting databases
for _, d := range [][]byte{DB_NODE, DB_BALANCER, DB_RANDOM, DB_GROUP, DB_TAG, DB_RELATIONS, DB_REGISTRY, DB_EVENT} {
_, err = tx.CreateBucketIfNotExists(d)
if err != nil {
return err
}
}
return nil
})
// Handling node change event
tree_event.ON(tree_event.ON_UPDATE_NODE_INFO, func(e *tree_event.Event) {
var (
info node_info.NodeInfo
ev_info node_info.NodeInfo
names []string
data []byte
mark bool
)
err.Err = ffjson.Unmarshal(e.Data, &ev_info)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
info, err = GetNodeInfo(ev_info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
if len(info.Name) > 0 {
err = DeleteNodeFromHisGroups(info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = DeleteNodeFromHisTags(info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
if len(ev_info.TreeIp) > 0 {
info.TreeIp = ev_info.TreeIp
mark = true
}
if ev_info.TreePort != -1 {
info.TreePort = ev_info.TreePort
mark = true
}
if len(ev_info.Childs[0]) > 0 {
info.Childs = append(info.Childs, ev_info.Childs[0])
}
if len(ev_info.Childs[1]) > 0 {
if g, ok := tree_lib.ArrayContains(info.Childs, ev_info.Childs[1]); ok {
info.Childs = info.Childs[:g+copy(info.Childs[g:], info.Childs[g+1:])]
}
}
if len(ev_info.Groups[0]) > 0 {
info.Groups = append(info.Groups, ev_info.Groups[0])
}
if len(ev_info.Groups[1]) > 0 {
if g, ok := tree_lib.ArrayContains(info.Groups, ev_info.Groups[1]); ok {
info.Groups = info.Groups[:g+copy(info.Groups[g:], info.Groups[g+1:])]
}
}
if len(ev_info.Tags[0]) > 0 {
info.Tags = append(info.Tags, ev_info.Tags[0])
}
if len(ev_info.Tags[1]) > 0 {
if g, ok := tree_lib.ArrayContains(info.Tags, ev_info.Tags[1]); ok {
info.Tags = info.Tags[:g+copy(info.Tags[g:], info.Tags[g+1:])]
}
}
data, err.Err = ffjson.Marshal(info)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = Set(DB_NODE, []byte(ev_info.Name), data)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
names, err = ListNodeNames()
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = AddNodeToHisGroups(info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = AddNodeToHisTags(info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
for _, n := range names {
err = SetRelations(n)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
}
if node_info.CurrentNodeInfo.Name == ev_info.Name && mark {
var e1 tree_event.Event
e1.Name = tree_event.ON_RESTART_NODE
tree_event.Trigger(&e1)
}
} else {
err = Set(DB_NODE, []byte(ev_info.Name), e.Data)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
names, err = ListNodeNames()
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = AddNodeToHisGroups(ev_info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
err = AddNodeToHisTags(ev_info.Name)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
for _, n := range names {
err = SetRelations(n)
if !err.IsNull() {
tree_log.Error(err.From, err.Error())
return
}
}
if node_info.CurrentNodeInfo.Name == ev_info.Name {
var e1 *tree_event.Event
e1.Name = tree_event.ON_RESTART_NODE
tree_event.Trigger(e1)
}
}
})
// Closing database before program will be exited
// Just in case if program exiting force or we don't want to make dead lock
tree_event.ON(tree_event.ON_PROGRAM_EXIT, func(e *tree_event.Event) {
CloseDB()
})
}