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dispatcher_entity_counts.go
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/
dispatcher_entity_counts.go
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/*
Copyright NetFoundry Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package events
import (
"github.com/openziti/ziti/controller/event"
"github.com/pkg/errors"
"reflect"
"strings"
"time"
)
func (self *Dispatcher) AddEntityCountEventHandler(handler event.EntityCountEventHandler, interval time.Duration, onlyLeaderEvents bool) {
self.entityCountEventHandlers.Append(&entityCountState{
handler: handler,
onlyLeaderEvents: onlyLeaderEvents,
interval: interval,
nextRun: time.Now(),
})
}
func (self *Dispatcher) RemoveEntityCountEventHandler(handler event.EntityCountEventHandler) {
for _, state := range self.entityCountEventHandlers.Value() {
if state.handler == handler {
self.entityCountEventHandlers.Delete(state)
}
}
}
func (self *Dispatcher) initEntityEvents() {
go self.generateEntityEvents()
}
func (self *Dispatcher) generateEntityEvents() {
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case t := <-ticker.C:
var event *event.EntityCountEvent
leader := self.network.Dispatcher.IsLeaderOrLeaderless()
for _, state := range self.entityCountEventHandlers.Value() {
if !state.onlyLeaderEvents || leader {
if t.After(state.nextRun) {
if event == nil {
event = self.generateEntityCountEvent()
}
state.handler.AcceptEntityCountEvent(event)
state.nextRun = state.nextRun.Add(state.interval)
}
}
}
case <-self.closeNotify:
return
}
}
}
func (self *Dispatcher) generateEntityCountEvent() *event.EntityCountEvent {
event := &event.EntityCountEvent{
Namespace: event.EntityCountEventNS,
Timestamp: time.Now(),
}
data, err := self.stores.GetEntityCounts(self.network.GetDb())
if err != nil {
event.Error = err.Error()
} else {
event.Counts = data
}
return event
}
func (self *Dispatcher) registerEntityCountEventHandler(val interface{}, config map[string]interface{}) error {
handler, ok := val.(event.EntityCountEventHandler)
if !ok {
return errors.Errorf("type %v doesn't implement github.com/openziti/ziti/controller/events/EntityCountEventHandler interface.", reflect.TypeOf(val))
}
interval := time.Minute * 5
if val, ok := config["interval"]; ok {
if strVal, ok := val.(string); ok {
var err error
interval, err = time.ParseDuration(strVal)
if err != nil {
return errors.Wrapf(err, "invalid duration value for edge.entityCounts interval: '%v'", strVal)
}
} else {
return errors.Errorf("invalid type %v for edge.entityCounts interval configuration", reflect.TypeOf(val))
}
}
propagateAlways := false
if val, found := config["propagateAlways"]; found {
if b, ok := val.(bool); ok {
propagateAlways = b
} else if s, ok := val.(string); ok {
propagateAlways = strings.EqualFold(s, "true")
} else {
return errors.New("invalid value for propagateAlways, must be boolean or string")
}
}
self.AddEntityCountEventHandler(handler, interval, !propagateAlways)
return nil
}
func (self *Dispatcher) unregisterEntityCountEventHandler(val interface{}) {
if handler, ok := val.(event.EntityCountEventHandler); ok {
self.RemoveEntityCountEventHandler(handler)
}
}
type entityCountState struct {
handler event.EntityCountEventHandler
onlyLeaderEvents bool
interval time.Duration
nextRun time.Time
}