yang qfandSoam Vasani
a8c6347ed0
This change adds a timer trigger API, client, and implementation. Users can trigger a function with a cron-compatible string. This change also moves the publisher interface and webhook-based publisher implementation out of kubewatcher and into a separate `publisher` package.
144 lines
3.0 KiB
Go
144 lines
3.0 KiB
Go
/*
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Copyright 2017 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package timer
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import (
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"github.com/robfig/cron"
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"log"
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"github.com/fission/fission"
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"github.com/fission/fission/publisher"
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)
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type requestType int
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const (
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SYNC requestType = iota
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)
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type (
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Timer struct {
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triggers map[string]*timerTriggerWithCron
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requestChannel chan *timerRequest
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publisher *publisher.Publisher
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}
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timerRequest struct {
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requestType
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triggers []fission.TimeTrigger
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responseChannel chan *timerResponse
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}
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timerResponse struct {
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error
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}
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timerTriggerWithCron struct {
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trigger fission.TimeTrigger
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cron *cron.Cron
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}
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)
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func MakeTimer(publisher publisher.Publisher) *Timer {
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timer := &Timer{
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triggers: make(map[string]*timerTriggerWithCron),
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requestChannel: make(chan *timerRequest),
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publisher: &publisher,
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}
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go timer.svc()
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return timer
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}
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func (timer *Timer) Sync(triggers []fission.TimeTrigger) error {
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req := &timerRequest{
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requestType: SYNC,
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triggers: triggers,
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responseChannel: make(chan *timerResponse),
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}
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timer.requestChannel <- req
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resp := <-req.responseChannel
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return resp.error
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}
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func (timer *Timer) svc() {
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for {
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req := <-timer.requestChannel
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switch req.requestType {
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case SYNC:
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err := timer.syncCron(req.triggers)
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req.responseChannel <- &timerResponse{error: err}
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}
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}
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}
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func (timer *Timer) syncCron(triggers []fission.TimeTrigger) error {
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for _, t := range triggers {
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if item, ok := timer.triggers[t.Name]; ok {
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// the item exists, update the item if needed
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if item.trigger.Uid == t.Uid {
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continue
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}
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// update cron if the cron spec changed
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if item.trigger.Cron != t.Cron {
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// if there is an cron running, stop it
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if item.cron != nil {
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item.cron.Stop()
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}
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item.cron = timer.newCron(t)
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}
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item.trigger = t
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} else {
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timer.triggers[t.Name] = &timerTriggerWithCron{
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trigger: t,
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cron: timer.newCron(t),
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}
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}
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}
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for k, v := range timer.triggers {
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found := false
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for _, t := range triggers {
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if t.Name == k {
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found = true
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break
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}
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}
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if !found {
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if v.cron != nil {
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v.cron.Stop()
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}
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delete(timer.triggers, k)
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}
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}
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return nil
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}
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func (timer *Timer) newCron(t fission.TimeTrigger) *cron.Cron {
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c := cron.New()
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c.AddFunc(t.Cron, func() {
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headers := map[string]string{
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"X-Fission-Timer-Name": t.Name,
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}
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(*timer.publisher).Publish("", headers, fission.UrlForFunction(&t.Function))
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})
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c.Start()
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log.Printf("Updated new cron for %v", t.Name)
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return c
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}
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