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evacuator.go
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/
evacuator.go
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package evacuator
import (
"os"
"code.cloudfoundry.org/lager"
"github.com/cloudfoundry/hm9000/config"
"github.com/cloudfoundry/hm9000/helpers/metricsaccountant"
"github.com/cloudfoundry/hm9000/models"
"github.com/cloudfoundry/hm9000/sender"
"github.com/cloudfoundry/hm9000/store"
"github.com/cloudfoundry/yagnats"
"github.com/nats-io/nats"
"code.cloudfoundry.org/clock"
)
type Evacuator struct {
messageBus yagnats.NATSConn
store store.Store
clock clock.Clock
metricsAccountant metricsaccountant.MetricsAccountant
config *config.Config
logger lager.Logger
sub *nats.Subscription
}
func New(messageBus yagnats.NATSConn, store store.Store, clock clock.Clock, metricsAccountant metricsaccountant.MetricsAccountant, config *config.Config, logger lager.Logger) *Evacuator {
return &Evacuator{
messageBus: messageBus,
store: store,
clock: clock,
metricsAccountant: metricsAccountant,
config: config,
logger: logger,
}
}
func (e *Evacuator) listen() error {
var err error
e.sub, err = e.messageBus.Subscribe("droplet.exited", func(message *nats.Msg) {
dropletExited, err := models.NewDropletExitedFromJSON([]byte(message.Data))
if err != nil {
e.logger.Error("Failed to parse droplet exited message", err)
return
}
e.handleExited(dropletExited)
})
return err
}
func (e *Evacuator) Run(signals <-chan os.Signal, ready chan<- struct{}) error {
e.logger.Info("Listening for DEA Evacuations")
err := e.listen()
if err != nil {
return err
}
close(ready)
select {
case <-signals:
if e.sub != nil {
e.messageBus.Unsubscribe(e.sub)
}
return nil
}
}
func (e *Evacuator) handleExited(exited models.DropletExited) {
switch exited.Reason {
case models.DropletExitedReasonDEAShutdown, models.DropletExitedReasonDEAEvacuation:
startMessage := models.NewPendingStartMessage(
e.clock.Now(),
0,
e.config.GracePeriod(),
exited.AppGuid,
exited.AppVersion,
exited.InstanceIndex,
2.0,
models.PendingStartMessageReasonEvacuating,
)
startMessage.SkipVerification = true
e.logger.Info("Scheduling start message for droplet.exited message", startMessage.LogDescription(), exited.LogDescription())
e.store.SavePendingStartMessages(startMessage)
evacuatorSender := sender.New(e.store, e.metricsAccountant, e.config, e.messageBus, e.logger, e.clock)
evacuatorSender.Send(e.clock, nil, []models.PendingStartMessage{startMessage}, nil)
}
}