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CronBasedEventReceiver.go
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CronBasedEventReceiver.go
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/*
* Copyright (c) 2020 Devtron Labs
*
* 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
*
* http://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 pubsub
import (
"encoding/json"
client "github.com/devtron-labs/devtron/client/events"
"github.com/devtron-labs/devtron/client/pubsub"
"github.com/devtron-labs/devtron/pkg/event"
"github.com/devtron-labs/devtron/util"
"github.com/nats-io/nats.go"
"go.uber.org/zap"
)
type CronBasedEventReceiver interface {
Subscribe() error
}
type CronBasedEventReceiverImpl struct {
logger *zap.SugaredLogger
pubsubClient *pubsub.PubSubClient
eventService event.EventService
}
func NewCronBasedEventReceiverImpl(logger *zap.SugaredLogger, pubsubClient *pubsub.PubSubClient, eventService event.EventService) *CronBasedEventReceiverImpl {
cronBasedEventReceiverImpl := &CronBasedEventReceiverImpl{
logger: logger,
pubsubClient: pubsubClient,
eventService: eventService,
}
err := util.AddStream(cronBasedEventReceiverImpl.pubsubClient.JetStrCtxt, util.KUBEWATCH_STREAM)
if err != nil {
logger.Errorw("err while adding stream", "err", err)
return nil
}
err = cronBasedEventReceiverImpl.Subscribe()
if err != nil {
logger.Errorw("err while subscribe", "err", err)
return nil
}
return cronBasedEventReceiverImpl
}
func (impl *CronBasedEventReceiverImpl) Subscribe() error {
_, err := impl.pubsubClient.JetStrCtxt.QueueSubscribe(util.CRON_EVENTS, util.CRON_EVENTS_GROUP, func(msg *nats.Msg) {
impl.logger.Debug("received cron event")
defer msg.Ack()
event := client.Event{}
err := json.Unmarshal([]byte(string(msg.Data)), &event)
if err != nil {
impl.logger.Errorw("Error while unmarshalling json data", "error", err)
return
}
err = impl.eventService.HandleEvent(event)
if err != nil {
impl.logger.Errorw("err while handle event on subscribe", "err", err)
return
}
}, nats.Durable(util.CRON_EVENTS_DURABLE), nats.DeliverLast(), nats.ManualAck(), nats.BindStream(util.KUBEWATCH_STREAM))
if err != nil {
impl.logger.Errorw("err", "err", err)
return err
}
return nil
}