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watch.go
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watch.go
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package state
import (
"github.com/docker/go-events"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/manager/state/watch"
)
// Event is the type used for events passed over watcher channels, and also
// the type used to specify filtering in calls to Watch.
type Event interface {
// TODO(stevvooe): Consider whether it makes sense to squish both the
// matcher type and the primary type into the same type. It might be better
// to build a matcher from an event prototype.
// matches checks if this item in a watch queue matches the event
// description.
matches(events.Event) bool
}
// EventCommit delineates a transaction boundary.
type EventCommit struct{}
func (e EventCommit) matches(watchEvent events.Event) bool {
_, ok := watchEvent.(EventCommit)
return ok
}
// TaskCheckFunc is the type of function used to perform filtering checks on
// api.Task structures.
type TaskCheckFunc func(t1, t2 *api.Task) bool
// TaskCheckID is a TaskCheckFunc for matching task IDs.
func TaskCheckID(t1, t2 *api.Task) bool {
return t1.ID == t2.ID
}
// TaskCheckNodeID is a TaskCheckFunc for matching node IDs.
func TaskCheckNodeID(t1, t2 *api.Task) bool {
return t1.NodeID == t2.NodeID
}
// TaskCheckServiceID is a TaskCheckFunc for matching service IDs.
func TaskCheckServiceID(t1, t2 *api.Task) bool {
return t1.ServiceID == t2.ServiceID
}
// TaskCheckStateGreaterThan is a TaskCheckFunc for checking task state.
func TaskCheckStateGreaterThan(t1, t2 *api.Task) bool {
return t2.Status.State > t1.Status.State
}
// EventCreateTask is the type used to put CreateTask events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventCreateTask struct {
Task *api.Task
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []TaskCheckFunc
}
func (e EventCreateTask) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventCreateTask)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Task, typedEvent.Task) {
return false
}
}
return true
}
// EventUpdateTask is the type used to put UpdateTask events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventUpdateTask struct {
Task *api.Task
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []TaskCheckFunc
}
func (e EventUpdateTask) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventUpdateTask)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Task, typedEvent.Task) {
return false
}
}
return true
}
// EventDeleteTask is the type used to put DeleteTask events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventDeleteTask struct {
Task *api.Task
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []TaskCheckFunc
}
func (e EventDeleteTask) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventDeleteTask)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Task, typedEvent.Task) {
return false
}
}
return true
}
// ServiceCheckFunc is the type of function used to perform filtering checks on
// api.Service structures.
type ServiceCheckFunc func(j1, j2 *api.Service) bool
// ServiceCheckID is a ServiceCheckFunc for matching service IDs.
func ServiceCheckID(j1, j2 *api.Service) bool {
return j1.ID == j2.ID
}
// EventCreateService is the type used to put CreateService events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventCreateService struct {
Service *api.Service
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ServiceCheckFunc
}
func (e EventCreateService) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventCreateService)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Service, typedEvent.Service) {
return false
}
}
return true
}
// EventUpdateService is the type used to put UpdateService events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventUpdateService struct {
Service *api.Service
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ServiceCheckFunc
}
func (e EventUpdateService) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventUpdateService)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Service, typedEvent.Service) {
return false
}
}
return true
}
// EventDeleteService is the type used to put DeleteService events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventDeleteService struct {
Service *api.Service
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ServiceCheckFunc
}
func (e EventDeleteService) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventDeleteService)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Service, typedEvent.Service) {
return false
}
}
return true
}
// NetworkCheckFunc is the type of function used to perform filtering checks on
// api.Service structures.
type NetworkCheckFunc func(n1, n2 *api.Network) bool
// NetworkCheckID is a NetworkCheckFunc for matching network IDs.
func NetworkCheckID(n1, n2 *api.Network) bool {
return n1.ID == n2.ID
}
// EventCreateNetwork is the type used to put CreateNetwork events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventCreateNetwork struct {
Network *api.Network
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NetworkCheckFunc
}
func (e EventCreateNetwork) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventCreateNetwork)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Network, typedEvent.Network) {
return false
}
}
return true
}
// EventUpdateNetwork is the type used to put UpdateNetwork events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventUpdateNetwork struct {
Network *api.Network
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NetworkCheckFunc
}
func (e EventUpdateNetwork) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventUpdateNetwork)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Network, typedEvent.Network) {
return false
}
}
return true
}
// EventDeleteNetwork is the type used to put DeleteNetwork events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventDeleteNetwork struct {
Network *api.Network
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NetworkCheckFunc
}
func (e EventDeleteNetwork) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventDeleteNetwork)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Network, typedEvent.Network) {
return false
}
}
return true
}
// NodeCheckFunc is the type of function used to perform filtering checks on
// api.Service structures.
type NodeCheckFunc func(n1, n2 *api.Node) bool
// NodeCheckID is a NodeCheckFunc for matching node IDs.
func NodeCheckID(n1, n2 *api.Node) bool {
return n1.ID == n2.ID
}
// NodeCheckState is a NodeCheckFunc for matching node state.
func NodeCheckState(n1, n2 *api.Node) bool {
return n1.Status.State == n2.Status.State
}
// EventCreateNode is the type used to put CreateNode events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventCreateNode struct {
Node *api.Node
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NodeCheckFunc
}
func (e EventCreateNode) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventCreateNode)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Node, typedEvent.Node) {
return false
}
}
return true
}
// EventUpdateNode is the type used to put DeleteNode events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventUpdateNode struct {
Node *api.Node
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NodeCheckFunc
}
func (e EventUpdateNode) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventUpdateNode)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Node, typedEvent.Node) {
return false
}
}
return true
}
// EventDeleteNode is the type used to put DeleteNode events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventDeleteNode struct {
Node *api.Node
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []NodeCheckFunc
}
func (e EventDeleteNode) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventDeleteNode)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Node, typedEvent.Node) {
return false
}
}
return true
}
// ClusterCheckFunc is the type of function used to perform filtering checks on
// api.Cluster structures.
type ClusterCheckFunc func(v1, v2 *api.Cluster) bool
// ClusterCheckID is a ClusterCheckFunc for matching volume IDs.
func ClusterCheckID(v1, v2 *api.Cluster) bool {
return v1.ID == v2.ID
}
// EventCreateCluster is the type used to put CreateCluster events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventCreateCluster struct {
Cluster *api.Cluster
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ClusterCheckFunc
}
func (e EventCreateCluster) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventCreateCluster)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Cluster, typedEvent.Cluster) {
return false
}
}
return true
}
// EventUpdateCluster is the type used to put UpdateCluster events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventUpdateCluster struct {
Cluster *api.Cluster
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ClusterCheckFunc
}
func (e EventUpdateCluster) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventUpdateCluster)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Cluster, typedEvent.Cluster) {
return false
}
}
return true
}
// EventDeleteCluster is the type used to put DeleteCluster events on the
// publish/subscribe queue and filter these events in calls to Watch.
type EventDeleteCluster struct {
Cluster *api.Cluster
// Checks is a list of functions to call to filter events for a watch
// stream. They are applied with AND logic. They are only applicable for
// calls to Watch.
Checks []ClusterCheckFunc
}
func (e EventDeleteCluster) matches(watchEvent events.Event) bool {
typedEvent, ok := watchEvent.(EventDeleteCluster)
if !ok {
return false
}
for _, check := range e.Checks {
if !check(e.Cluster, typedEvent.Cluster) {
return false
}
}
return true
}
// Watch takes a variable number of events to match against. The subscriber
// will receive events that match any of the arguments passed to Watch.
//
// Examples:
//
// // subscribe to all events
// Watch(q)
//
// // subscribe to all UpdateTask events
// Watch(q, EventUpdateTask{})
//
// // subscribe to all task-related events
// Watch(q, EventUpdateTask{}, EventCreateTask{}, EventDeleteTask{})
//
// // subscribe to UpdateTask for node 123
// Watch(q, EventUpdateTask{Task: &api.Task{NodeID: 123},
// Checks: []TaskCheckFunc{TaskCheckNodeID}})
//
// // subscribe to UpdateTask for node 123, as well as CreateTask
// // for node 123 that also has ServiceID set to "abc"
// Watch(q, EventUpdateTask{Task: &api.Task{NodeID: 123},
// Checks: []TaskCheckFunc{TaskCheckNodeID}},
// EventCreateTask{Task: &api.Task{NodeID: 123, ServiceID: "abc"},
// Checks: []TaskCheckFunc{TaskCheckNodeID,
// func(t1, t2 *api.Task) bool {
// return t1.ServiceID == t2.ServiceID
// }}})
func Watch(queue *watch.Queue, specifiers ...Event) (eventq chan events.Event, cancel func()) {
if len(specifiers) == 0 {
return queue.Watch()
}
return queue.CallbackWatch(events.MatcherFunc(func(event events.Event) bool {
for _, s := range specifiers {
if s.matches(event) {
return true
}
}
return false
}))
}