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routing_table_handler.go
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routing_table_handler.go
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package routing_table
import (
"errors"
"sync"
"code.cloudfoundry.org/bbs"
"code.cloudfoundry.org/bbs/models"
"code.cloudfoundry.org/lager"
"code.cloudfoundry.org/tcp-emitter/emitter"
"code.cloudfoundry.org/tcp-emitter/routing_table/schema"
"code.cloudfoundry.org/tcp-emitter/routing_table/schema/event"
"code.cloudfoundry.org/tcp-emitter/routing_table/util"
)
//go:generate counterfeiter -o fakes/fake_routing_table_handler.go . RoutingTableHandler
type RoutingTableHandler interface {
HandleEvent(event models.Event)
Sync()
Syncing() bool
}
type routingTableHandler struct {
logger lager.Logger
routingTable schema.RoutingTable
emitter emitter.Emitter
bbsClient bbs.Client
syncing bool
cachedEvents []models.Event
sync.Locker
}
func NewRoutingTableHandler(logger lager.Logger, routingTable schema.RoutingTable, emitter emitter.Emitter, bbsClient bbs.Client) RoutingTableHandler {
return &routingTableHandler{
logger: logger,
routingTable: routingTable,
emitter: emitter,
bbsClient: bbsClient,
syncing: false,
cachedEvents: nil,
Locker: &sync.Mutex{},
}
}
func (handler *routingTableHandler) Syncing() bool {
handler.Lock()
defer handler.Unlock()
return handler.syncing
}
func (handler *routingTableHandler) HandleEvent(event models.Event) {
handler.Lock()
defer handler.Unlock()
if handler.syncing {
handler.logger.Debug("caching-events")
handler.cachedEvents = append(handler.cachedEvents, event)
} else {
handler.handleEvent(event)
}
}
func (handler *routingTableHandler) Sync() {
logger := handler.logger.Session("bulk-sync")
logger.Debug("starting")
var tempRoutingTable schema.RoutingTable
defer func() {
handler.Lock()
handler.applyCachedEvents(logger, tempRoutingTable)
handler.syncing = false
handler.cachedEvents = nil
handler.Unlock()
logger.Debug("completed")
}()
handler.Lock()
handler.cachedEvents = []models.Event{}
handler.syncing = true
handler.Unlock()
var runningActualLRPs []*models.ActualLRPGroup
var getActualLRPsErr error
var desiredLRPSchedulingInfos []*models.DesiredLRPSchedulingInfo
var getDesiredLRPsErr error
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
logger.Debug("getting-actual-lrps")
actualLRPResponses, err := handler.bbsClient.ActualLRPGroups(logger, models.ActualLRPFilter{})
if err != nil {
logger.Error("failed-getting-actual-lrps", err)
getActualLRPsErr = err
return
}
logger.Debug("succeeded-getting-actual-lrps", lager.Data{"num-actual-responses": len(actualLRPResponses)})
runningActualLRPs = make([]*models.ActualLRPGroup, 0, len(actualLRPResponses))
for _, actualLRPResponse := range actualLRPResponses {
actual, _ := actualLRPResponse.Resolve()
if actual.State == models.ActualLRPStateRunning {
runningActualLRPs = append(runningActualLRPs, actualLRPResponse)
}
}
}()
wg.Add(1)
go func() {
defer wg.Done()
logger.Debug("getting-desired-lrps")
desiredLRPResponses, err := handler.bbsClient.DesiredLRPSchedulingInfos(logger, models.DesiredLRPFilter{})
if err != nil {
logger.Error("failed-getting-desired-lrps", err)
getDesiredLRPsErr = err
return
}
logger.Debug("succeeded-getting-desired-lrps", lager.Data{"num-desired-responses": len(desiredLRPResponses)})
desiredLRPSchedulingInfos = make([]*models.DesiredLRPSchedulingInfo, 0, len(desiredLRPResponses))
for _, desiredLRPResponse := range desiredLRPResponses {
desiredLRPSchedulingInfos = append(desiredLRPSchedulingInfos, desiredLRPResponse)
}
}()
wg.Wait()
if getActualLRPsErr == nil && getDesiredLRPsErr == nil {
tempRoutingTable = schema.NewTable(handler.logger, nil)
handler.logger.Debug("construct-routing-table")
for _, desireLrpSchedulingInfo := range desiredLRPSchedulingInfos {
tempRoutingTable.AddRoutes(desireLrpSchedulingInfo)
}
for _, actualLrp := range runningActualLRPs {
tempRoutingTable.AddEndpoint(actualLrp)
}
} else {
logger.Info("sync-failed")
}
}
func (handler *routingTableHandler) applyCachedEvents(logger lager.Logger, tempRoutingTable schema.RoutingTable) {
logger.Debug("apply-cached-events")
if tempRoutingTable == nil || tempRoutingTable.RouteCount() == 0 {
// sync failed, process the events on the current table
handler.logger.Debug("handling-events-from-failed-sync")
for _, e := range handler.cachedEvents {
handler.handleEvent(e)
}
logger.Debug("done-handling-events-from-failed-sync")
return
}
logger.Debug("tempRoutingTable", lager.Data{"route-count": tempRoutingTable.RouteCount()})
table := handler.routingTable
emitter := handler.emitter
handler.routingTable = tempRoutingTable
handler.emitter = nil
for _, e := range handler.cachedEvents {
handler.handleEvent(e)
}
handler.routingTable = table
handler.emitter = emitter
logger.Debug("applied-cached-events")
routingEvents := handler.routingTable.Swap(tempRoutingTable)
logger.Debug("swap-complete", lager.Data{"events": len(routingEvents)})
handler.emit(routingEvents)
}
func (handler *routingTableHandler) handleEvent(event models.Event) {
switch event := event.(type) {
case *models.DesiredLRPCreatedEvent:
handler.handleDesiredCreate(event.DesiredLrp)
case *models.DesiredLRPChangedEvent:
handler.handleDesiredUpdate(event.Before, event.After)
case *models.DesiredLRPRemovedEvent:
handler.handleDesiredDelete(event.DesiredLrp)
case *models.ActualLRPCreatedEvent:
handler.handleActualCreate(event.ActualLrpGroup)
case *models.ActualLRPChangedEvent:
handler.handleActualUpdate(event.Before, event.After)
case *models.ActualLRPRemovedEvent:
handler.handleActualDelete(event.ActualLrpGroup)
default:
handler.logger.Error("did-not-handle-unrecognizable-event", errors.New("unrecognizable-event"), lager.Data{"event-type": event.EventType()})
}
}
func (handler *routingTableHandler) handleDesiredCreate(desiredLRP *models.DesiredLRP) {
logger := handler.logger.Session("handle-desired-create", util.DesiredLRPData(desiredLRP))
logger.Debug("starting")
defer logger.Debug("complete")
routingEvents := handler.routingTable.AddRoutes(util.DesiredLRPSchedulingInfo(desiredLRP))
handler.emit(routingEvents)
}
func (handler *routingTableHandler) handleDesiredUpdate(before, after *models.DesiredLRP) {
logger := handler.logger.Session("handling-desired-update", lager.Data{
"before": util.DesiredLRPData(before),
"after": util.DesiredLRPData(after),
})
logger.Debug("starting")
defer logger.Debug("complete")
routingEvents := handler.routingTable.UpdateRoutes(
util.DesiredLRPSchedulingInfo(before),
util.DesiredLRPSchedulingInfo(after),
)
handler.emit(routingEvents)
}
func (handler *routingTableHandler) handleDesiredDelete(desiredLRP *models.DesiredLRP) {
logger := handler.logger.Session("handling-desired-delete", util.DesiredLRPData(desiredLRP))
logger.Debug("starting")
defer logger.Debug("complete")
routingEvents := handler.routingTable.RemoveRoutes(util.DesiredLRPSchedulingInfo(desiredLRP))
handler.emit(routingEvents)
}
func (handler *routingTableHandler) handleActualCreate(actualLRPGrp *models.ActualLRPGroup) {
actualLRP, evacuating := actualLRPGrp.Resolve()
logger := handler.logger.Session("handling-actual-create", util.ActualLRPData(actualLRP, evacuating))
logger.Debug("starting")
defer logger.Debug("complete")
if actualLRP.State == models.ActualLRPStateRunning {
handler.addAndEmit(actualLRPGrp)
}
}
func (handler *routingTableHandler) addAndEmit(actualLRPGrp *models.ActualLRPGroup) {
routingEvents := handler.routingTable.AddEndpoint(actualLRPGrp)
handler.emit(routingEvents)
}
func (handler *routingTableHandler) removeAndEmit(actualLRPGrp *models.ActualLRPGroup) {
routingEvents := handler.routingTable.RemoveEndpoint(actualLRPGrp)
handler.emit(routingEvents)
}
func (handler *routingTableHandler) emit(routingEvents event.RoutingEvents) {
if handler.emitter != nil && len(routingEvents) > 0 {
handler.emitter.Emit(routingEvents)
}
}
func (handler *routingTableHandler) handleActualUpdate(beforeGrp, afterGrp *models.ActualLRPGroup) {
before, beforeEvacuating := beforeGrp.Resolve()
after, afterEvacuating := afterGrp.Resolve()
logger := handler.logger.Session("handling-actual-update", lager.Data{
"before": util.ActualLRPData(before, beforeEvacuating),
"after": util.ActualLRPData(after, afterEvacuating),
})
logger.Debug("starting")
defer logger.Debug("complete")
switch {
case after.State == models.ActualLRPStateRunning:
handler.addAndEmit(afterGrp)
case after.State != models.ActualLRPStateRunning && before.State == models.ActualLRPStateRunning:
handler.removeAndEmit(beforeGrp)
}
}
func (handler *routingTableHandler) handleActualDelete(actualLRPGrp *models.ActualLRPGroup) {
actualLRP, evacuating := actualLRPGrp.Resolve()
logger := handler.logger.Session("handling-actual-delete", util.ActualLRPData(actualLRP, evacuating))
logger.Debug("starting")
defer logger.Debug("complete")
if actualLRP.State == models.ActualLRPStateRunning {
handler.removeAndEmit(actualLRPGrp)
}
}