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management.go
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management.go
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package daemon
import (
"context"
"fmt"
"github.com/SoftwareDefinedBuildings/spawnpoint/service"
"github.com/SoftwareDefinedBuildings/spawnpoint/spawnd/backend"
)
func (daemon *SpawnpointDaemon) manageService(svc *serviceManifest, done chan<- struct{}) {
ctx, cancelFunc := context.WithCancel(context.Background())
restartInProgress := false
defer close(done)
defer cancelFunc()
for event := range svc.Events {
switch event {
case service.Boot:
daemon.logger.Debugf("(%s) State machine received service boot event", svc.Name)
daemon.resourceLock.Lock()
if svc.CPUShares <= daemon.availableCPUShares && svc.Memory <= daemon.availableMemory {
daemon.logger.Debugf("(%s) Daemon has sufficient CPU and memory for new service", svc.Name)
daemon.availableCPUShares -= svc.CPUShares
daemon.availableMemory -= svc.Memory
daemon.resourceLock.Unlock()
defer func() {
daemon.resourceLock.Lock()
daemon.availableCPUShares += svc.CPUShares
daemon.availableMemory += svc.Memory
daemon.resourceLock.Unlock()
}()
} else {
daemon.logger.Debugf("(%s) Has insufficient CPU and memory for new service, rejecting", svc.Name)
msg := fmt.Sprintf("[ERROR] Insufficient resources for service. CPU: Have %v, Want %v. Mem: Have %v, Want %v",
daemon.availableCPUShares, svc.CPUShares, daemon.availableMemory, svc.Memory)
if err := daemon.publishLogMessage(svc.Name, msg); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
daemon.resourceLock.Unlock()
return
}
daemon.logger.Debugf("(%s) Attempting to start new service", svc.Name)
if err := daemon.publishLogMessage(svc.Name, "[INFO] Launching service..."); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
svcID, err := daemon.backend.StartService(ctx, svc.Configuration)
if err != nil {
daemon.logger.Errorf("(%s) Failed to start service: %s", svc.Name, err)
if err = daemon.publishLogMessage(svc.Name, fmt.Sprintf("[ERROR] Failed to start service: %s", err)); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
}
daemon.logger.Debugf("(%s) Service started successfully", svc.Name)
if err = daemon.publishLogMessage(svc.Name, "[SUCCESS] Service container has started"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
svc.ID = svcID
daemon.registryLock.Lock()
daemon.serviceRegistry[svc.Name] = svc
daemon.registryLock.Unlock()
defer func() {
daemon.registryLock.Lock()
delete(daemon.serviceRegistry, svc.Name)
daemon.registryLock.Unlock()
}()
go daemon.tailLogs(ctx, svc, true)
go daemon.monitorEvents(ctx, svc)
go daemon.publishServiceHeartbeats(ctx, svc, heartbeatInterval)
case service.Adopt:
daemon.logger.Debugf("(%s) State machine received service adopt event", svc.Name)
// Accept all previously running services without doing a quota check
daemon.resourceLock.Lock()
daemon.availableCPUShares -= svc.CPUShares
daemon.availableMemory -= svc.Memory
daemon.resourceLock.Unlock()
defer func() {
daemon.resourceLock.Lock()
daemon.availableCPUShares += svc.CPUShares
daemon.availableMemory += svc.Memory
daemon.resourceLock.Unlock()
}()
daemon.registryLock.Lock()
daemon.serviceRegistry[svc.Name] = svc
daemon.registryLock.Unlock()
defer func() {
daemon.registryLock.Lock()
delete(daemon.serviceRegistry, svc.Name)
daemon.registryLock.Unlock()
}()
go daemon.tailLogs(ctx, svc, false)
go daemon.monitorEvents(ctx, svc)
go daemon.publishServiceHeartbeats(ctx, svc, heartbeatInterval)
case service.Restart:
daemon.logger.Debugf("(%s) State machine received service restart event", svc.Name)
if err := daemon.backend.RestartService(ctx, svc.ID); err != nil {
daemon.logger.Errorf("(%s) Failed to restart service: %s", svc.Name, err)
if err = daemon.publishLogMessage(svc.Name, "[ERROR] Failed to restart service"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
}
if err := daemon.publishLogMessage(svc.Name, "[SUCCESS] Restarted service container"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
// Need to re-initialize container logging
go daemon.tailLogs(ctx, svc, false)
// Set flag so that inevitable service die event is ignored
restartInProgress = true
case service.Stop:
daemon.logger.Debugf("(%s) State machine received service stop event", svc.Name)
if err := daemon.backend.StopService(ctx, svc.ID); err != nil {
daemon.logger.Errorf("(%s) Failed to stop service: %s", svc.Name, err)
if err = daemon.publishLogMessage(svc.Name, "[ERROR] Failed to stop service"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
}
if err := daemon.publishLogMessage(svc.Name, "[SUCCESS] Stopped service container"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
if err := daemon.backend.RemoveService(ctx, svc.ID); err != nil {
daemon.logger.Errorf("(%s) Failed to remove service: %s", svc.Name, err)
if err = daemon.publishLogMessage(svc.Name, "[ERROR] Failed to remove service"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
}
if err := daemon.publishLogMessage(svc.Name, "[SUCCESS] Removed service container"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
case service.Die:
daemon.logger.Debugf("(%s) State machine received die event", svc.Name)
if restartInProgress {
// Service termination was part of a normal restart
daemon.logger.Debugf("(%s) This was part of a normal restart, ignoring", svc.Name)
restartInProgress = false
continue
}
if svc.AutoRestart {
daemon.logger.Debugf("(%s) Auto-restart enabled, attempting service restart", svc.Name)
if err := daemon.backend.RestartService(ctx, svc.ID); err != nil {
daemon.logger.Errorf("(%s) Failed to restart service: %s", svc.Name, err)
if err = daemon.publishLogMessage(svc.Name, "[ERROR] Failed to restart service"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
return
}
if err := daemon.publishLogMessage(svc.Name, "[SUCCESS] Restarted service container"); err != nil {
daemon.logger.Errorf("(%s) Failed to publish log message: %s", svc.Name, err)
}
// Need to re-initialize container logging
go daemon.tailLogs(ctx, svc, false)
} else {
if err := daemon.backend.RemoveService(ctx, svc.ID); err != nil {
daemon.logger.Errorf("(%s) Failed to remove service: %s", svc.Name, err)
}
return
}
}
}
}
func (daemon *SpawnpointDaemon) monitorEvents(ctx context.Context, svc *serviceManifest) {
eventChan, errChan := daemon.backend.MonitorService(context.Background(), svc.ID)
for event := range eventChan {
switch event {
case backend.Die:
daemon.logger.Debugf("(%s) Container has died", svc.Name)
svc.Events <- service.Die
default:
daemon.logger.Warningf("(%s) Unknown event received for container", svc.Name)
}
}
select {
case err := <-errChan:
daemon.logger.Errorf("(%s) Error while monitoring docker events: %s", svc.Name, err)
default:
}
}