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maintain.go
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maintain.go
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package maintain
import (
"errors"
"os"
"time"
"github.com/cloudfoundry-incubator/bbs"
"github.com/cloudfoundry-incubator/bbs/models"
"github.com/cloudfoundry-incubator/executor"
"github.com/pivotal-golang/clock"
"github.com/pivotal-golang/lager"
"github.com/tedsuo/ifrit"
)
type Maintainer struct {
Config
executorClient executor.Client
serviceClient bbs.ServiceClient
logger lager.Logger
clock clock.Clock
}
type Config struct {
CellID string
RepAddress string
Zone string
RetryInterval time.Duration
RootFSProviders []string
PreloadedRootFSes []string
}
func New(
config Config,
executorClient executor.Client,
serviceClient bbs.ServiceClient,
logger lager.Logger,
clock clock.Clock,
) *Maintainer {
return &Maintainer{
Config: config,
executorClient: executorClient,
serviceClient: serviceClient,
logger: logger.Session("maintainer"),
clock: clock,
}
}
const ExecutorPollInterval = time.Second
var ErrSignaledWhileWaiting = errors.New("signaled while waiting for executor")
func (m *Maintainer) Run(sigChan <-chan os.Signal, ready chan<- struct{}) error {
m.logger.Info("starting-executor-heartbeat")
defer m.logger.Info("complete-executor-heartbeat")
for {
heartbeater, err := m.waitForExecutor(sigChan)
if err != nil {
m.logger.Error("error-while-waiting-for-executor", err)
return err
}
err = m.heartbeat(sigChan, ready, heartbeater)
ready = nil
if err == nil {
return nil
}
m.logger.Error("executor-ping-failed", err)
}
}
func (m *Maintainer) waitForExecutor(sigChan <-chan os.Signal) (ifrit.Runner, error) {
m.logger.Info("start-waiting-for-executor")
defer m.logger.Info("complete-waiting-for-executor")
sleeper := m.clock.NewTimer(ExecutorPollInterval)
for {
m.logger.Debug("waiting-pinging-executor")
err := m.executorClient.Ping()
if err == nil {
return m.createHeartbeater()
}
m.logger.Error("failed-to-ping-executor-on-start", err)
sleeper.Reset(ExecutorPollInterval)
select {
case <-sigChan:
m.logger.Info("signaled-while-waiting-for-executor")
return nil, ErrSignaledWhileWaiting
case <-sleeper.C():
}
}
}
func (m *Maintainer) createHeartbeater() (ifrit.Runner, error) {
resources, err := m.executorClient.TotalResources()
if err != nil {
return nil, err
}
cellCapacity := models.NewCellCapacity(resources.MemoryMB, resources.DiskMB, resources.Containers)
cellPresence := models.NewCellPresence(m.CellID, m.RepAddress, m.Zone, cellCapacity, m.RootFSProviders, m.PreloadedRootFSes)
return m.serviceClient.NewCellPresenceRunner(m.logger, &cellPresence, m.RetryInterval), nil
}
func (m *Maintainer) heartbeat(sigChan <-chan os.Signal, ready chan<- struct{}, heartbeater ifrit.Runner) error {
m.logger.Info("start-heartbeating")
defer m.logger.Info("complete-heartbeating")
ticker := m.clock.NewTicker(m.RetryInterval)
defer ticker.Stop()
heartbeatProcess := ifrit.Background(heartbeater)
heartbeatExitChan := heartbeatProcess.Wait()
select {
case <-heartbeatProcess.Ready():
m.logger.Info("ready")
case err := <-heartbeatExitChan:
if err != nil {
m.logger.Error("heartbeat-exited", err)
}
return err
case <-sigChan:
m.logger.Info("signaled-while-starting-heatbeater")
heartbeatProcess.Signal(os.Kill)
<-heartbeatExitChan
return nil
}
if ready != nil {
close(ready)
}
for {
select {
case err := <-heartbeatExitChan:
m.logger.Error("heartbeat-lost-lock", err)
return err
case <-sigChan:
m.logger.Info("signaled-while-heartbeating")
heartbeatProcess.Signal(os.Kill)
<-heartbeatExitChan
return nil
case <-ticker.C():
m.logger.Debug("heartbeat-pinging-executor")
err := m.executorClient.Ping()
if err == nil {
continue
}
m.logger.Info("start-signaling-heartbeat-to-stop")
heartbeatProcess.Signal(os.Kill)
select {
case <-heartbeatExitChan:
m.logger.Info("heartbeat-stopped")
return err
case <-sigChan:
m.logger.Info("signaled-while-waiting-for-heartbeat-to-stop")
return nil
}
}
}
}